• Measurement of electrode paste height

    (1) The measurement should be made twice in each shift, once during the shift, and once during the shift, and make a record. (2) The measuring position of each shift must be in the same position (inner triangle or outer triangle). (3) Each shift should decide how much electrode paste should be installed according to the height of the electrode paste. (4) The measuring personnel should be careful not to touch the two-phase electrodes at the same time to prevent electric shock. (5) The measurement must be accurate.

    01-18 2022

  • Causes of electrode paste accidents in submerged arc furnaces

    Electrode accidents are common accidents in ferroalloys and calcium carbide enterprises smelted by submerged arc furnaces. The cause of electrode accidents is analyzed and judged accurately, and targeted preventive measures can be taken to reduce the occurrence of electrode accidents. However, due to the analysis of electrode accidents, it is supplied by electrode paste. The manufacturer and the electrode paste use the interference of multiple factors. To accurately determine the cause of the electrode accident requires objective evidence recognized by both parties, and the electrode section is a good objective evidence, so the analysis of the electrode section is of great significance. . 1. Electrode paste segregates, resulting in layering of aggregate and powder 1. Section status: There is obvious particle layer segregation on the section of the electrode. According to the size and cross-section of the radiant heat source for electrode baking, there are two situations, one is the accumulation of particles along the outer ring of the electrode,…

    01-18 2022

  • Crushing process of electrode paste ingredients

    This process mainly has several forms in terms of the layout of process equipment. A flat layout: all the crushing equipment, screening equipment, milling equipment, and storage bins are all on the same plane. It is basically manual operation, the environment is very poor, and the labor intensity is high. This arrangement method is mainly used by some small enterprises and manufacturers with small output. The process is simple and the investment is small. Not suitable for large-scale production requirements and environmental protection requirements. Belongs to extensive production methods. It is characterized by low investment, high labor intensity, high pollution, and low efficiency. In today's social environment where people-oriented, safety and environmental protection are first, small factories should also improve the method of eliminating this kind of medium-crushed ingredients. graphite electrode, cold ramming paste, semi coke, electrode paste, graphite carbon block, smelt material, Two-dimensional layout: This layout mainly uses the gravity of the material for process layout. First, the materials…

    01-17 2022

  • Comparison of anode paste and electrode paste

    Anode paste is the predecessor of preparing anodes in electrolyzers in aluminum plants. In the 40 years before 1995, the anode paste was once the largest product in China's aluminum carbon products. After 2000, this product will gradually be replaced by anode carbon blocks. It is the product with the largest output among carbon products. The anode paste is a carbon paste made of petroleum coke and pitch coke as aggregates and coal tar pitch as a binder. It is used as anode material for continuous self-baking aluminum electrolytic cell. Because of its high content of binder (more than 24%), it is paste-like before the upper part of the electrolytic cell is sintered, so it is called anode paste. The prepared anode is not only capable of good electrical conductivity, but also resistant to high temperature and corrosion, and at the same time the price is low. The resistivity of the preliminary anode is 50-70 μΩ.m, plus the lead and…

    01-17 2022

  • Causes of electrode paste soft breaking accident

    The reason for the soft fracture of the electrode paste is quite right. Generally speaking, there are mainly the following aspects: (1) The electrode paste contains too much volatile matter. (2) The iron plate of the electrode shell is too thin or too thick. Too thin will not be able to withstand large external forces and rupture, causing the electrode iron shell to fold or leak and softly break when pressed and put; too thick will cause the iron shell and the electrode core to not contact closely and cause the core to cross. It will also cause soft disconnection. (3) Poor production of the electrode iron shell or poor welding quality will cause cracking, which will lead to leakage or soft fracture. (4) When the electrode is lowered, the load of the electric furnace is not reduced or reduced too little. After the electrode is discharged, the load increases too fast, which will also cause the electrode to softly…

    01-16 2022

  • New energy electrode paste airtight paste

    The new type of electrode paste is made of refined raw coal, desulfurizer, combustion-supporting agent and other materials. It is made through fine washing, desulfurization, and vacuum stirring mechanisms. It can be processed into rectangles, squares, oval shapes and other shapes according to user needs. Weight of lumpy product. The product has the following characteristics (compared with natural lump coal): 1. Uniform particle size and regular shape; 2. The void ratio is high, and the reaction activity is high; 3. The thermal efficiency is 20% higher than that of raw coal; 4. Reduce emissions of hazardous substances by 40%; 5. The broken rate is reduced by 30%; 6. Reduce the screening process. In the process of vigorously promoting new energy production, the new electrode paste will be a new type of environmentally friendly product that replaces raw coal, especially for smelting enterprises, 20%-30% of electrode paste can be added to reduce the amount of coke and greatly reduce smelting cost.…

    01-16 2022

  • How to use electrode paste

    The use process and consumption of the electrode paste In terms of the characteristics of use, the electrode paste is a continuous self-baking electrode. During use, the outer layer is a cylinder made of a 1-2mm thick steel plate. The electrode paste is regularly added to the cylinder. As the production progresses, the electrode paste is gradually softened-melted-baked. During roasting, a large amount of volatile matter is released. After entering the conductive clip part of the electrode, it changes from semi-coking to complete coking due to the high temperature, and finally becomes a conductive carbon electrode. The electrode paste is baked into a conductive electrode by various heat of the electric furnace itself, so it is called a self-baking electrode. During the working process of the electrode, a section of cylinder is connected to the top of the electrode at regular intervals, and a certain amount of electrode paste is added, and this is repeated.

    01-15 2022

  • Controlling the sintering temperature of electrode paste

    When the sintering temperature of the electrode paste is between 300 and 800 degrees, because the volatile matter of the coal tar pitch has been discharged, the remaining coal tar pitch has been carbonized to form a network, and it is fused with various electrode paste raw materials, and the mechanical strength reaches the standard value. Our Rongxin Carbon technicians have calculated that the compressive strength of the electrode paste at this time is 17-33 MPa, the flexural strength is 7--17 MPa, and the tensile strength is 4--8 MPa. After the electrode below the copper tile of the submerged electric furnace enters the smelting process, the temperature of the electrode will rise further due to the further increase in the temperature of the raw material, and the mechanical strength will increase with the rise in temperature. The temperature of other materials rises to 1500 degrees. When the mechanical strength drops sharply, such as heat-resistant alloys, the mechanical strength of carbon…

    01-15 2022

  • Self-baking electrode for submerged arc furnace

    Electrode paste is called self-baking electrode in the smelting industry. It is called self-baking electrode because the process of baking into electrode is completed in submerged arc furnace by the heat of electric current. Because of its uniform composition, low melting point, fast melting rate, and shortening of smelting time, electrode paste is receiving more and more attention from steelmaking enterprises and is hailed as a new type of material in the 21st century. It is mainly used for smelting in submerged arc furnaces. Pre-melted multifunctional refining slag has been used maturely in foreign countries, such as South Korea, Japan, Europe and the United States, etc., and has gradually attracted the attention and application of the domestic metallurgical industry. The electrode paste produced by our factory is melted in an electric furnace, open hearth furnace, and cupola, with few impurities, stable and uniform composition, and can also be produced according to the chemical composition required by customers. Products with different…

    01-14 2022

  • The difference between electrode paste and airtight paste

    The so-called airtight paste is only for the type of submerged arc furnace. Submerged arc furnace is divided into closed type, semi-closed type and open type. These different types of submerged arc furnaces use electrode pastes. Because of the different furnace types, over time, the electrode pastes applied to closed submerged arc furnaces are called closed electrode pastes, or closed pastes for short; they are used in open or semi-closed furnaces. The electrode paste on the closed submerged arc furnace is called standard electrode paste or just electrode paste. The airtight paste itself is a kind of electrode paste. Of course, generally speaking, the quality of the sealed electrode paste is one grade higher than that of the ordinary electrode paste. Resistance and ash content should perform better.

    01-14 2022

  • Forming method of electrode paste-extrusion method

    The working process of the extrusion method and the compression method is basically the same. First, the paste is introduced into the material chamber, and the paste is pre-compressed through the main plunger. Different from the molding method, the subsequently extruded paste will be extruded through a nozzle installed in the front of the material chamber, so that the paste has the same shape and size as the nozzle, and the model method is completed by a mold made by yourself fixed. After the Huoliao is squeezed out, the edges are cut to the specified length, and the squeezed green body is finished. Some pipes, larger bars and other products with irregular shapes can be produced by the extrusion method of a vertical vibration forming machine. This method is very simple to operate, and can be produced continuously, which improves the production efficiency and the degree of mechanization of the products produced is relatively high. The disadvantage of the extrusion…

    01-13 2022

  • Current distribution between motor housing and electrode paste

    The electrode paste is basically non-conductive before 450°C, and all current passes through the electrode shell. At 500°C, the current through the electrode paste gradually increases. After 800°C, more than 50% of the current flows through the electrode paste. The temperature continues to rise, and with the oxidation and ablation of the electrode shell, the resistance also increases sharply, while the resistance of the electrode paste decreases correspondingly, and all the current is borne by the electrode paste. The use of electrode paste has no obvious effect on the current distribution law at the same temperature. For example, when the standard paste is used at 500°C, 0.82% of the current flows through the electrode paste, and it is increased to 2.34% with the special paste. The standard paste is 9.63% at 600℃, and the special paste is 12%. From this point of view, the low-temperature conductivity of the special paste has not been significantly improved. Its thermal conductivity is good,…

    01-13 2022

  • Manganese-silicon alloy submerged arc furnace newly opened for sintering

    The electrode is the only channel for the electric furnace to input electric energy, and it can also be said to be the heart of the electric furnace. Therefore, making the electrode have good working conditions is the key to the success of the furnace. Large-scale submerged arc furnaces generally use self-baking electrodes. Self-baking electrodes use anthracite, pitch, etc. as raw materials to make electrode paste at a certain temperature, and then put the electrode paste into the installed electrode shell and sinter it . Therefore, to make a reasonable oven system, it is necessary to understand the sintering characteristics of the electrode paste. Sintering process of Rongxin carbon electrode paste self-baking electrode The self-baking electrode sintering process is a process in which the binder decomposes and gradually discharges volatiles as the temperature increases. The sintering of the electrode can be roughly divided into three stages. The first stage: the temperature rises from the outdoor air temperature to 200°, and…

    01-12 2022

  • High standard sealed paste electrode paste

    【Physical and Chemical Index of Electrode Paste】 Resistance: <65 Ash content: <5% Volatile: 10.0-15.0 Density: >1.46g/cm3 Pressure coefficient: >23Mpa Extensibility: 6-20 Shape: egg ball, trapezoid, cylinder. Packing: Ton bag or export packing. According to customer requirements. Note: The parameter is the limit value reached by our factory. Please call us for details. [Electrode paste, with a daily production capacity of 500 tons] After Rongxin Carbon completed its automation transformation in 2008, it can achieve a production capacity of 500 tons per day. What is the concept of 500 tons. The 15,000 silico-manganese alloy furnace needs about 80 tons of Rongxin carbon electrode paste per day, so the daily output of Rongxin Carbon Factory can meet the monthly demand of six 15,000 silico-manganese alloy furnaces. The large-scale production of electrode paste products benefited from the transformation of standardized automation equipment. In a standardized production line, the quality of electrode paste can be strictly controlled, each link can be traced, and each…

    01-12 2022

  • Mechanical strength of electrode paste

    The mechanical strength of the electrode paste includes compressive strength, flexural strength and tensile strength. The height of the electrode paste refers to the height from the upper end of the electrode clip to the top of the electrode paste. If the electrode paste is too high, the thick and fine particles in the electrode paste are prone to delamination, or the electrode cylinder will be swollen due to too much pressure of the paste column. If the electrode paste column is too low, the pressure of the paste column is too small and the filling is poor, and it is difficult to obtain Dense electrodes. The electrode paste is consumed too quickly. The proper height of the electrode paste column is beneficial to improve the quality of electrode firing and reduce consumption. Electrode paste is the conductive electrode of various submerged electric furnaces, and it is an indispensable product in industrial production. We have read many domestic and foreign…

    01-11 2022

  • The relationship between electrode paste and electrode in production

    1) The electrode paste has high ash content, and the bonding strength of the electrode paste is poor. Where the ash content is concentrated, the bonding force is worse. This place consumes quickly and is easy to be mechanically strained and cause hard fracture. 2) If the softening point of the electrode paste is low, the coking value after sintering of the electrode paste is low, and the electrode strength is also poor, which is likely to cause electrode accidents. 3) The high resistivity of the electrode paste indicates that the electrode paste has a low degree of graphitization, poor conductivity, poor electrode oxidation resistance, strong electrode rigidity after firing, and the electrode is also easy to break.

    01-11 2022

  • The choice of electrode paste to anthracite

    ①Because of its proper fluidity during the softening and firing process, it greatly reduces the flow of the electrode accidents. ②The special paste has good thermal conductivity, which is helpful for the sintering of the electrode.Anthracite is the main raw material of electrode paste. The performance of anthracite is related to the performance of electrode paste. Therefore, it is necessary to understand and explore the performance of anthracite to ensure the quality of electrode paste. my country's anthracite coal is mainly distributed in Shanxi, Ningxia, and Guizhou. The anthracite from Dawukou in Ningxia is the best quality anthracite. Anthracite is an indispensable raw material for the carbon industry. It is mainly used for semi-graphite cathode carbon blocks, electric furnace carbon blocks, blast furnace carbon blocks, carbon electrodes and various pastes. Researching and discussing the various properties of anthracite is very beneficial for improving the quality of carbon products. We have been engaged in carbon work for many years. We have…

    01-10 2022

  • These advantages of special paste

    ①Because of its proper fluidity during the softening and firing process, it greatly reduces the flow of the electrode accidents. ②The special paste has good thermal conductivity, which is helpful for the sintering of the electrode. ③Special paste has lower specific resistance, and its conductivity is slightly higher than standard paste at the same temperature. ④ The special paste has good corrosion resistance, and its consumption is about 27% lower than that of the standard paste. These advantages of the special paste will definitely play a significant role in improving the working state of the electrode, reducing electrode accidents, and promoting the development of production.

    01-10 2022

  • Electrode paste and self-baking anode

    In view of the need for continuous high-temperature production, submerged arc furnaces usually operate uninterruptedly for several years. For this reason, the self-baking electrodes of electric furnaces are required to be able to continuously transmit electricity. The quality, performance, firing technology and conditions of the electrode paste should meet the requirements of the production technology. The self-baking electrode is made of anthracite, coke, pitch and coke as raw materials, matched and mixed in a certain proportion of particle size, stirred and kneaded at an appropriate temperature, then pressed into shape, and cooled to make a paste. When in use, the small pieces of electrode paste are loaded into the electrode shell of the submerged arc furnace, and during the production process, it relies on the Joule heat generated when the current passes through and the conduction heat in the furnace to self-sinter and coke. The electrode can be used in continuous forming and used while being connected and sintered, and…

    01-09 2022

  • Factors affecting the thermal shock resistance of electrode paste

    According to the research results of carbon experts at home and abroad, the main factors affecting thermal shock resistance are tensile strength, linear thermal expansion coefficient, Young's modulus, bulk density, thermal shock parameters, thermal conductivity, etc. According to the characteristics of the production and use of the electrode paste, under certain production equipment and process conditions, the tensile strength and bulk density of the electrode paste during the sintering process are almost a fixed value. For example, the bulk density of the electrode paste after sintering is per cubic meter. The centimeter is 1.4 grams, and the tensile strength is 6 MPa per square centimeter. Therefore, it can only be investigated from the perspective of production equipment and technology. The Young's modulus and thermal shock parameters that affect thermal shock resistance are constants. The discussion of linear thermal expansion coefficient is more complicated, and we will do a special discussion in Chenguang Metallurgy. Here we mainly discuss the influence of…

    01-09 2022

  • Changes in electrode paste properties during sintering

    At present, the domestic ferroalloy submerged arc furnace usually uses self-baking electrodes. When smelting manganese-silicon alloy, the normal consumption of electrode paste is about 30-40kg/t, which accounts for about 0.7% to 1.5% of the total cost. Although the cost of electrode paste accounts for a very low proportion of the total cost, it plays a key role in the operation of electric furnaces and the economic and technical indicators of smelting. Therefore, people often compare the electrode to the "heart" of the submerged arc furnace, which vividly shows that the electrode is in the submerged arc furnace. The role of the furnace. Due to the different production conditions of electric furnaces in various factories, some factories feel that standard pastes (standard paste and closed paste) are not very suitable, and often require electrode paste manufacturers to make certain adjustments to the formula, such as appropriately reducing the amount of binder, so gradually A non-standard paste is formed. Especially in recent…

    01-08 2022

  • The prospect of electrode paste

    The consumption of electrode paste in the calcium carbide industry accounts for about 70%-80% of the total output of electrode paste. The calcium carbide market continues to improve, which is also the development opportunity for the electrode paste industry. Electrode paste is a conductive material supplied to electric furnace equipment such as ferroalloy furnaces and calcium carbide furnaces. It can withstand high temperatures and has a small coefficient of thermal expansion. It has a relatively small resistivity, which can reduce the loss of electrical energy. With a small porosity, the electrode in the heated state can be oxidized slowly. The high mechanical strength prevents the electrode from breaking due to the influence of mechanical and electrical loads. Benefiting from the upgrading of my country's calcium carbide industry, the calcium carbide industry has ushered in great development, which has also enabled my country's electrode paste market to develop by leaps and bounds after 2015. However, since 2016, the industry has begun…

    01-08 2022

  • Electric furnace smelting ferronickel technology

    Submerged arc furnace for laterite mine is a better technical choice for producing ferronickel. At present, it is believed that the better process route is laterite ore---dehydration, agglomeration---adding coke and flux---electric furnace smelting---making coarse ferronickel---reducing C, SI, S, P Impurities, converter refining --- ferronickel (granulated, cast block) or smelted stainless steel. The public art of obtaining stainless steel products directly from laterite ore has been realized by Inner Mongolia Mingtuo Company. According to the differences in process methods, resource conditions, product quality, etc., pyro-ferronickel smelting technologies are diverse. At present, there are rotary furnace direct reduction methods, blast furnace methods, blast furnace methods, and electric heating methods. Among them, the electric heating method can be divided into electric carbon heating and electric heating silicon method. The products are divided into a single nickel-iron and nickel-chromium compound or nickel-chromium and cobalt compound alloy methods. As far as we are concerned, we can only involve the production technology of electric furnace ferronickel,…

    01-07 2022

  • Electrode paste escort bucket

    Electrode paste protection barrel is a steel electrode paste escort barrel smelting method based on the commonly used iron sheet electrode paste smelting method in my country's current calcium carbide and ferroalloy production industries. It uses a small amount of steel to weld the main body of the electrode. The skeleton replaces the more expensive iron sheet consumption. Compared with similar equipment, its shape can be reduced by two-fifths. The inner wall of the escort barrel is made of special material, which is neither bonded to the electrode paste, but also a good insulator. A temperature monitor is set at the center of the electrode to control the temperature changes of the various layers of the electrode during the firing process. The built-in steel electrode paste is in With the cooperation of the pressure and discharge cylinder of the top mechanical device, in accordance with the requirements of the process and technical indicators, the electrode length and speed consumed in…

    01-07 2022

  • Safety production specifications for electrode paste

    1. The general safety rules must be carefully implemented. 2. Welding electrode cylinders must be in accordance with the "Safety Operating Regulations for Electric and Gas Welding" with a certificate. 3. It is not allowed to do both work when filling the electrode paste and welding the electrode shell at the same time. 4. Metal objects are not allowed to be stacked on the paste platform, and it is forbidden to touch two electrodes at the same time to prevent electric shock. 5. The electrode paste must be clean and not mixed with debris. When adding the paste, be careful not to spread the paste on the platform and cause UMC. 6. The roundness of the electrode shell should be ensured during the transportation and lifting of the electrode shell. 7. Hand over and take over the measurement of paste notes to ensure the quality of electrode sintering and avoid paste-breaking accidents. 8. When adding paste and welding electrode shells,…

    01-06 2022

  • Analysis of Delamination in the Sintering Process of Electrode Paste

    The electrode diameter of the large-scale closed calcium carbide furnace to be developed at present is relatively large, the working length is relatively long, the tensile force generated by its own weight is greater, high mechanical strength is required, and new compressive strength control indicators need to be re-standardized; Now that energy saving has become a national policy, the country has very strict energy consumption indicators for large-scale enclosed calcium carbide furnaces. Therefore, the electrode paste should have a relatively small resistivity to reduce the loss of electrical energy. Therefore, the original control indicators of the electrode paste must be updated. Change. The height of the electrode paste refers to the height from the upper end of the electrode clip to the top of the electrode paste. If the electrode paste is too high, the thick and fine particles in the electrode paste are prone to delamination, or the electrode cylinder will be swollen due to too much pressure of…

    01-06 2022

  • Analysis and Suggestions on Electrode Paste Accident

    1. The electrode paste is unqualified and the volatile content is too low, which will cause premature sintering. 2. Excessive water content will cause material collapse and flame rise, which will burn the sealing and insulating materials, causing the electrode paste in the electrode shell to sinter prematurely and form overburn. During over-burning, the electrode shell is also deformed due to high temperature, and the iron sheet is completely accumulated on the bottom ring due to deformation during pressing and release, forming electrical conduction, thereby piercing the bottom ring and contact elements. Or in the case of sealing and insulation burnout, high-temperature furnace gas enters the shield, and tar is precipitated after condensation, causing a short circuit to pierce the contact element and the bottom ring. 3. The discharge nozzle is seriously damaged, which makes the material surface too high, and the temperature of the furnace surface will rise at the same time. It will also cause the electrode paste…

    01-05 2022

  • Heat source and process of electrode paste sintering

    1. Heat source for electrode paste sintering The electrode has a high carbon content, and its own electrical and thermal conductivity is excellent; the resistance heat generated by the current passing through the electrode itself (the resistance of the ferrosilicon electrode paste is generally about 70, and the resistance of the nickel-iron electrode paste is slightly lower at about 65. In sub-fields, this resistance is still relatively high. You must know that the resistance of the graphite electrode is about 5.); The conduction and radiation of the furnace surface flame (the domestic submerged arc furnace is submerged arc operation, and this operation makes the contact surface more generated. Large heat, then this heat can be conducted by the electrode paste after sintering.) 2. The process of electrode paste sintering. The boundary of the change process of electrode paste during sintering is not very obvious, but in order to facilitate research and control, according to the temperature and position of sintering,…

    01-05 2022

  • The problem of slow sintering of electrode paste

    Generally speaking, three aspects should be considered as the cause of the accident: submerged arc furnace equipment problem; worker operation problem; electrode paste quality problem. Because equipment problems are quantitative, the equipment under normal conditions is the same as the equipment in the event of an accident. Then we must consider the issues of worker operation and the quality of electrode paste. The daily operations of workers are not the same, such as when to increase the load, when to reduce the load, and so on. Electrode paste quality problem: The quality of electrode paste depends on the ratio of electrode paste raw materials. It is not very sure that the quality of electrode paste from different batches of electrode paste factory is exactly the same. In Rongxin Carbon Electrode Paste Plant, the formula of each plant is different. For long-term and stable customers, we will supply every month, and we can achieve the same quality every month. After the…

    01-04 2022

  • Unit consumption of electrode paste

    Carbon equipment products Carbon paste products can be divided into two categories, one is conductive materials (such as electrode paste and anode paste); the other is used as bonding fillers for building carbon blocks (such as bottom paste, coarse seam paste) And fine seam paste). Electrode paste, electrode paste is an important consumable conductive material for the production of calcium carbide and ferroalloy, and it is a kind of "self-baking electrode" in terms of its properties. At present, the mine thermal electric furnace consumes about 45kg of electrode paste for every ton of 75% Si-containing ferrosilicon produced, and about 30kg of electrode paste for every ton of calcium carbide produced. The main raw materials for the production of electrodes are anthracite, metallurgical coke, coal and coal pitch, which can be divided into two categories according to different formulations: 1) Standard and non-standard electrode paste: Standard electrode paste is mainly used in open ferroalloy furnaces and small and medium-sized calcium carbide…

    01-04 2022

  • The reason and treatment method of electrode hard broken

    1. Reasons for the hard break of the electrode (1) The ash content in the electrode paste is too high, or it is improperly stored in normal times, entrained more impurities, and the electrode paste contains less volatile matter, premature sintering or poor sintering properties, causing hard fracture of the electrode. (2) There are many power outages, often stop and open, and fail to take necessary measures during power outages, which will cause electrode cracking and sintering stratification. (3) There is a lot of dust falling into the motor shell, especially after a long-term power failure, a thick layer of ash will accumulate in the electrode iron shell. Cause the electrode to break hard. (4) The power outage time is long, and the electrode working section is not buried in the furnace charge, and it is severely oxidized, which will also cause the electrode to hardly break. (5) The electrode is too long and the pulling force is too large,…

    01-03 2022

  • How to prevent soft and hard breaking of electrodes

    1. Soft disconnection of the electrode (1) The air supply volume of the electrode and the cooling water volume of the conductive jaw plate should be reasonably controlled. This requires the operator to carefully conduct inspections and adjust the air volume and water volume in time to ensure that the electrode baking can proceed normally. (2) Be vigilant when pressing and discharging the electrode, increase the load with boldness and carefulness, and observe the changes of the electrode more. If the electrode is deteriorated, the load should be reduced immediately, and the power supply should be cut off if necessary. (3) The quality of electrode paste should be adjusted in time, and unqualified electrode paste should not be used. (4) Strictly inspect the welding quality of the electrode iron shell, and must meet the quality standards stipulated in the technical conditions. (5) It is necessary to strictly implement the electrode management system, lower the electrodes according to the regulations, carefully…

    01-03 2022

  • Electrode paste requirements for raw materials

    The raw material for making electrode paste is composed of solid carbon material and binding material. The quality of the electrode paste is related to the material formula and process. Solid materials include anthracite, metallurgical coke, petroleum coke and pitch coke, and graphite electrode scraps. Anthracite is dense, high in carbon content, low in volatile matter and low in price. Adding anthracite can improve the electrical conductivity and thermal conductivity of the electrode. The binding materials are pitch and tar. Tar is added to adjust the softening point. The binder in the electrode paste decomposes and removes volatiles during the sintering process, and the residual carbon is transformed into a strong coke net, which has a coking effect, making the electrode a hard whole. Anthracite requires less than 8% ash, less than 5% volatiles, and low sulfur content. It is necessary to use a shaft furnace or a rotary kiln to calcinate at a high temperature of 1473K for 18-24…

    01-02 2022

  • Precautions for making electrode paste

    1. The paste mixing is carried out on the horizontal double kneading rail. The purpose of kneading is to fill the gaps between the solid carbon particles and coat the surface of the dispersed particles with a layer of adhesive to bond the particles together. Kneaded into a uniform paste. Put the prepared paste in a kneader and stir for 30 minutes to make the paste evenly mixed. When the temperature of the paste reaches 115-120. When C, it can be kneaded and shaped. 2. The anthracite coal accounts for 50% of the electrode paste. The anthracite coal is broken into a larger particle size, generally less than 20 mm. The purpose of controlling the particle size composition is to make the particles densest, so that an electrode with high strength and good conductivity can be obtained. 3. The heating amount of the binder should not be too small, because it is not easy to be uniform when making the…

    01-02 2022

  • Electrode paste management

    If the electrode paste is not well managed, and the dirty electrode paste is put into the electrode bucket, the electrode will be locally overheated and broken due to the different composition of the electrode. Therefore, during the storage, transportation and use of the electrode paste, the following must be done: 1. The electrode paste stacking site must be a cement floor, and it is strictly forbidden to mix in external soil and impurities. 2. The carriage for transporting electrode paste must be cleaned, and it is strictly forbidden to mix in coal powder, dust or other impurities. 3. The spare electrode paste must be managed and covered with a tarp to avoid long-term wind and sun, mutual adhesion or quality changes.

    01-01 2022

  • Baking of self-baking electrodes

    In the smelting process, with the consumption and lowering of the electrodes, it is necessary to continuously add electrode paste and continuously extend the electrode barrel from the upper part. In this process, the height of the paste column must be controlled well to fire a good quality sintered electrode. Generally, the height of the paste column is 4-5 times the electrode diameter. If the paste column is too high, the thick and fine particles in the electrode paste are prone to delamination. If the paste column is too low, it is difficult to obtain a dense electrode due to the low pressure of the paste column and the small filling ability. . The self-baking electrode baking process can be roughly divided into the following stages according to the baking temperature and position: 1. Softening section: It rises from room temperature to 200 after heating. C. At this time, the electrode paste is all softened into a fluid state, and…

    01-01 2022

  • How to judge the sintering quality of electrode paste

    If it is found that the surface of the lowered electrode is grayish white, dark but not red or reddish, it means that the baking is good. It can also be judged according to the smoke from the electrode when the electrode is put down. For example, a small amount of white smoke on the electrode that is put down is normal, no smoke is overburning, and thick smoke is underburning. In addition, you can also use the round steel to test the electrode that has just been put down on the lower edge of the copper tile.

    12-31 2021

  • Several common electrode accidents

    1. Premature sintering of the electrode: the electrode paste has been sintered and hardened on the upper edge of the copper tile. It is called premature sintering. Premature sintering of the electrode paste will cause poor contact between the copper tile and the electrode, which will cause the copper tile to be burned out by arc, and it will also easily cause the electrode to become hard. Off. 2. Leaking paste: Liquid or semi-liquid electrode paste flowing out from the damaged part of the electrode barrel is called leaking paste. If paste leakage occurs, power off immediately, otherwise it may cause the entire bucket of electrode paste to flow into the furnace, causing a major accident. A slight paste leakage may easily cause problems such as soft disconnection of the electrode from the leakage. 3. Hard breaking: the electrode breaking at the sintered part is called hard breaking. Hard breaking usually reddened the existing small cracks, and then became brighter…

    12-31 2021

  • Electrode soft breaking accident and its treatment

    1. Reasons for the soft break of the electrode (1) The electrode paste contains too much volatile matter. (2) The iron plate of the motor shell is too thin or too thick. Too thin to withstand external forces and rupture, causing the electrode iron shell to fold or leak and softly break when pressed and placed. Too thick will cause the iron shell and the electrode core to not contact closely and cause the core to cross, which may also cause Soft off. (3) Poor production of the electrode iron shell or poor welding quality will cause cracks, which will lead to soft breakage or paste leakage. (4) When the electrode is lowered, the electrode load is not reduced or reduced too little. After the electrode is discharged, the load increases too fast, which will also cause the electrode to softly break (except for large furnaces). (5) The electrode is lowered too frequently, the interval is too short, or after…

    12-30 2021

  • Judgment of the quality of electrode paste

    The quality of the electrode paste is mainly based on visual observation. Determine whether the electrode sintering is normal. If the surface of the electrode is found to be off-white or dark but not red, the sintering is good. If it is red, it is too dry, if it is black or smokes a lot, it is too soft. In order to maintain a certain length of the electrode, the electrode paste must balance the sintering speed and the consumption speed during the sintering process. If the sintering is slow and the consumption is fast, the electrode will be too soft if the working length is not enough. If the sintering is fast and the consumption is slow, the electrode is too dry and easy to hard break. In order to make the electrode sintering quality good, the following conditions must be met. 1. The electrode paste that meets the quality standard and the lumpiness requirement should be kept at…

    12-30 2021

  • Electrode paste sintering process

    Although there is no obvious change in the changing process of the electrode paste during sintering, it can be roughly divided into various stages according to the firing temperature and position. This process is carried out without external pressure and solely on the weight of the paste itself. 1. The softening stage. At this time, the solid electrode paste melts, the resistance increases, and the strength decreases, and finally all the electrode paste becomes a liquid state. At this stage the temperature is 25. C rises to 120~200. C, about 500 mm above the conductive jaw. 2. The volatilization stage. At this time, the electrode paste is fully melted, flows along the inner section of the shell, fills the gaps, and makes the quality uniform, and at the same time, it volatilizes and becomes viscous gradually. The resistance keeps decreasing, and the volatilization becomes a paste. At this stage, the temperature changes from 120 to 200. C rises to 650~750.…

    12-29 2021

  • Heat source for baking electrode paste

    The electrode paste is sintered in the electrode shell, and its heat source comes from three aspects: 1. Electric heating itself conducts heat. The temperature of the electrode tip can reach 3,500 due to arcing. About C, because the heat conducts from bottom to top, the electrode paste is heated more and more when it falls from the top to the top, and it is gradually sintered. The conduction of arc heat is the main source of heat required for firing the electrode. 2. The resistance heat generated by the current passing through the resistance itself. When the current flows through the electrode, due to the large sintering resistance of the electrode paste, part of the input power becomes resistance heat, which provides a certain amount of heat for the firing of the electrode. 3. The conduction and radiation of flame heat on the charge surface. The temperature of the stove surface is very high, generally between 500 and 600.…

    12-29 2021

  • Solve the problem of soft electrode breakage when using electrode paste

    1. Strictly control and master the length of the working end of the electrode, and reasonably control the pressure and release time, so that the pressure and release speed is compatible with the sintering speed. When processing the material surface after every 24 hours, observe the firing of the electrode in order to better control the softness of the electrode. Hard conditions (such as finding that the surface of the lowered electrode is off-white, dark but not red or reddish, indicating that the electrode is well baked; if the surface of the lowered electrode is red, it indicates that the electrode has been overfired; if the surface is black, it indicates that the electrode is under-baked. It is also possible. Poke the electrode with round steel. If it is very hard and rebounds, it means the electrode is over-burned. If it is elastic, it means it is normal. If it is soft, it means the electrode is under-burned. The heating…

    12-28 2021

  • Precautions for using graphite electrodes in steel smelters

    1. Choose the appropriate electrode type and diameter according to the capacity of the electric furnace and the capacity of the equipped transformer. 2. In the process of loading and unloading the graphite electrode and storage, pay attention to prevent damage and dampness. The damp electrode should be used after being dried by the electric furnace, and the joint hole of the electrode and the surface thread of the joint should be protected for lifting. 3. When connecting the electrode, use compressed air to blow off the dust in the connector hole. The force used to screw the connector into the electrode connector hole must be stable and uniform, and the tightening torque must comply with the regulations. When holding the electrode with the holder, be sure to avoid the joint area and clamp it above or below the bottom of the electrode joint hole. 4. When loading charge into the electric furnace, in order to reduce the impact of…

    12-28 2021

  • Rongxin group of graphite electrodes types

    1. Natural graphite electrode. The natural graphite electrode is an electrode produced using natural flake graphite as a raw material. Adding coal pitch to natural graphite, through kneading, shaping, roasting and machining, the natural graphite electrode can be prepared. Its resistivity is relatively high, the mechanical strength is low, and it is easy to break during actual use. A small amount of small size natural graphite electrodes are used in some special occasions. 2. Artificial graphite electrode. Using petroleum coke or pitch coke as solid aggregate and coal tar pitch as binder, the artificial graphite electrode can be prepared through kneading, molding, roasting, graphitization and machining. Artificial graphite electrodes are high-temperature resistant graphite conductive materials. Carbon material companies with graphite electrodes as the main varieties constitute the metallurgical carbon material industry. 3. Graphite electrode with anti-oxidation coating. As the coating increases the price of graphite electrodes and there are some problems in its use, there is currently no widespread use…

    12-27 2021

  • High-power and ultra-high-power graphite electrodes

    The development of electric furnace steelmaking technology has continuously put forward requirements for the variety and performance of graphite electrodes. The use of high-power and ultra-high-power electric furnaces for steelmaking can shorten the melting time of the charge, increase production efficiency, reduce power consumption and reduce the consumption of graphite electrodes . According to the transformer capacity per ton of furnace capacity, electric arc steelmaking furnaces can be divided into ordinary power furnaces, high power furnaces, and ultra-high power furnaces. According to the classification of the electric power level of electric furnace steelmaking, and according to the difference of the raw materials used to produce the electrode and the difference of the physical and chemical indexes of the finished electrode, the corresponding ginger graphite electrode is divided into 3 varieties: ordinary power graphite electrode (RP), high power graphite electrode (HP) , Ultra-high power graphite electrode (UHP). Ordinary power graphite electrodes are produced from ordinary petroleum coke, with low graphitization temperature,…

    12-27 2021

  • Graphite electrode production process Rongxin group

    1. Calcining. Both petroleum coke and pitch coke need to be calcined, and the calcining temperature should reach 1350. C, to fully remove the volatile matter contained in the carbonaceous raw materials, and improve the true density, mechanical strength, and conductivity of the coke. 2. Crushing, screening and batching. The calcined carbonaceous raw material is crushed and sieved into aggregate particles of specified size, part of the coke is ground into fine powder, and then weighed according to the formula to form a dry mixture of various particles. 3. Kneading. Under the heating state, the quantitative dry mixture of various particles and the quantitative binder are stirred and mixed and kneaded to form a plastic paste. 4. Forming. Under the action of external pressure or high-frequency vibration, the paste is pressed into a green electrode with a certain shape and higher density. 5. Roasting. Put the green electrode in a special roasting furnace, and use metallurgical coke powder to fill…

    12-26 2021

  • Anti-oxidation coating graphite electrode

    The anti-oxidation coating graphite electrode is a coated electrode made of graphite electrode as the substrate and sprayed with an oxidation-resistant coating on the surface of the body. The preparation process is to fuse a thin layer of aluminum-based cermet on the surface of the processed graphite electrode. The coating material, which can conduct electricity and is resistant to oxidation, is formed by the eutectic of aluminum and refractory mud with multiple components. Its characteristics and functions are as follows: 1. Provide the electrode with a high-efficiency oxygen barrier layer and a highly conductive outer surface layer, which can prevent the electrode surface from being oxidized and reduce electrode consumption, and can reduce the current density inside the electrode. 2. The anti-oxidation coating can withstand quite high temperature without melting, and the decomposition temperature of the coating is 1850. Above C. 3. The coating is well combined with the electrode surface and has a similar coefficient of linear expansion. 4.…

    12-26 2021

  • Solve anode failure during aluminum electrolysis

    70% of aluminum electrolytic cell failures occur in pre-baked anodes. Anode failures that often occur in electrolyzers include: partial overheating of the anode, uneven current distribution, anode dropout, anode long bag, anode crack fault, anode block shedding, a large amount of carbon slag falling into the electrolyte to make it carbon-containing, oxidation and combustion around the anode, and The anode is tilted and so on. These failures are mainly caused by the quality of pre-baked anodes and improper electrolysis operations. 1. The anode drops off. The pre-baked anode may cause the anode carbon block to separate from the steel claw due to the poor casting of the phosphorus pig iron or the defect of the anode carbon bowl. When this phenomenon occurs, it is necessary to remove the carbon anode from the electrolytic cell and replace it with a new pre-baked anode. When the anode carbon block has large cracks, the block will also be cracked. 2. Long anode bag.…

    12-25 2021

  • The hazards of pre-baked anodic oxidation slag and cracks

    During the operation of the electrolytic cell, carbon slag and fragments are continuously produced around the bottom of the anode carbon block, which will not only increase the carbon consumption, but the carbon slag fragments suspended in the electrolyte will destroy the normal technical conditions of electrolytic aluminum production and seriously endanger the production of aluminum electrolysis. Normal operation, even leading to an accident shutdown. The hazards of pre-baked anodized slag and cracks are mainly as follows: 1. Change the conductivity of the electrolyte, thereby affecting the normal operation of aluminum electrolysis production. 2. Make the electrolyte generate heat and generate a heat sink. The accumulation of carbon slag and the increase of electrolyte resistance result in an increase in the cell voltage and an increase in heat income, which gradually leads to the heat cell. As a result, the current efficiency decreases, and the power consumption, carbon consumption, and unit consumption of fluoride salt increase. 3. Scraping of carbon…

    12-25 2021

  • The main problems and solutions of electrode paste manufacturers

    The main problem that plagues electrode paste manufacturers is that the electrode paste baking speed is too slow. Some manufacturers adopt methods to reduce the amount of asphalt used. This method is effective to a certain extent, but too low amount of pitch causes the fluidity of the electrode paste to deteriorate, and the electrode paste is not easy to be filled in the electrode cylinder, and the density after sintering is poor and it is easy to cause hard fracture. Another method is to lower the softening point of the pitch and increase the sintering speed of the electrode. However, the softening point of the pitch cannot be reduced indefinitely, because the pitch with a too low softening point reduces the coking rate of the pitch, and the strength of the electrode should also be reduced. There is a hard break phenomenon. Therefore, in addition to properly mastering the above two methods in the production of electrode paste, the…

    12-24 2021

  • The production process of pre-baked anode

    1. Raw materials. The pre-baked anode adopts low-ash raw materials. Petroleum coke and residual electrode are used as aggregates. The impurity content is generally not more than 0.5%. The binder is coal tar pitch. Pre-baked anode production has widely used modified pitch or high-temperature pitch as a binder. 2. Calcination. Use rotary kiln or tank calciner at 1250. The petroleum coke is calcined at a high temperature of about C. 3. Crushing and screening. The forged petroleum coke and residual pole are crushed, sieved and ground into different strength materials according to the requirements of the formula, and then put into their respective silos. 4. Ingredients. The ingredients are set by the formula I set. There are two types of pre-baked anode formulas: large particle formula and small particle formula. The maximum particle size of the aggregate is 12mm~15mm. The amount of coal tar pitch varies according to the dry material formula and molding process. Generally, It is 16%~18%. 5.…

    12-24 2021

  • What are the characteristics of graphite materials

    The graphite material is mainly composed of polycrystalline graphite. Graphite is a multi-layer laminated crystal with a hexagonal planar network structure between carbon atoms. Although graphite material is an inorganic non-metallic material, it has good thermal and electrical conductivity, and at the same time has a thermal expansion coefficient far lower than that of metal, a high melting point and chemical stability, which makes graphite materials very useful in industrial applications. High value. Graphite materials are chemically inert in non-oxidizing media and have good corrosion resistance. Except for strong acids and strong oxidizing media, graphite materials are not corroded by other acids, alkalis, and salts, and hardly react with organic compounds. . Graphite material is also a kind of high temperature resistant material. Graphite will not melt under high temperature, but at 3350 under normal pressure. C began to slowly sublimate into gas. The strength of general materials will gradually decrease at high temperatures, while graphite materials are in 2000.…

    12-23 2021

  • Overall classification of carbon materials

    Carbon materials include hundreds of varieties and thousands of specifications of products. According to materials, carbon materials can be divided into carbon products, semi-graphite products, natural graphite products and artificial graphite products. According to performance, carbon materials can be divided into graphite electrodes and graphite anodes, carbon electrodes and carbon anodes, carbon blocks, paste products, special carbon and graphite products, carbon products for mechanical and electronic industries, carbon fibers and their Composite materials and graphite chemical equipment, etc. According to service objects, carbon materials can be divided into carbon materials for metallurgical industry, carbon materials for aluminum industry, carbon materials for chemical industry, carbon materials for mechanical and electronic industries, and new carbon materials for high-tech sectors. According to the function of use, carbon materials can be divided into three categories: conductive materials, structural materials and special functional materials. (1) Conductive materials. Such as graphite electrodes for electric arc furnaces, carbon electrodes, natural graphite electrodes, electrode paste and anode paste,…

    12-23 2021

  • Production characteristics of graphite electrodes

    1. Long production cycle. The production cycle of ordinary power graphite electrodes is about 45 days, the production cycle of ultra-high power graphite electrodes is more than 70 days, and the production cycle of graphite electrode joints that require multiple dipping is longer. 2. High energy consumption. The production of 1t of ordinary power graphite electrode requires about 6000kw·h of electricity, thousands of cubic meters of gas or natural gas, and about 11t of metallurgical coke particles and metallurgical coke powder. 3. Many production processes. The production process includes raw material calcination, crushing and grinding, batching, kneading, molding, impregnation, graphitization and mechanical processing. Its production requires a lot of special mechanical equipment and kilns with special structures, the construction investment is relatively large, and the investment recovery period is relatively long. 4. A certain amount of dust and harmful gases are generated during the production process, and it is necessary to adopt perfect ventilation and dust reduction and environmental protection…

    12-22 2021

  • Development Trend of Graphite Electrode Steelmaking

    In the early 1960s, major changes occurred in electric furnace steelmaking technology, especially the adoption of ultra-high-power electric arc furnace technology, which clarified the technical direction for improving the production efficiency of electric furnaces. From the 1960s to the mid-1980s, the electric furnace smelting cycle was shortened from 3 hours. By 4 hours, the acceleration of the continuous casting rhythm has promoted the improvement of the production efficiency of electric furnace steelmaking, that is, increasing the capacity of the electric furnace, increasing the energy input to the electric furnace per unit time, and shortening the electric furnace smelting cycle. On the basis of ultra-high-power power supply, the international community has focused on the development of modern electric furnace smelting technologies that increase heat energy, such as enhanced oxygen supply, scrap preheating, and hot metal smelting. The development of these technologies has greatly shortened the electric furnace smelting cycle, and reduced the power consumption and graphite electrode consumption. 1. Large-scale electric…

    12-22 2021

  • Storage and management of electrode paste

    As the self-baking electrode of submerged electric furnace, electrode paste has been widely used in the smelting of various products of submerged electric furnace. Although the cost of electrode paste in the production of calcium carbide, ferroalloy and other products is relatively low, the quality of the electrode paste and the firing of the electrode directly affect the stability of the operation of the submerged electric furnace. Due to the various types of submerged electric furnaces, the different furnace conditions, and the increasing capacity of electric furnaces, when the quality index of the electrode paste meets the requirements, the roasting quality plays a decisive factor, which requires us to focus on calcium carbide, ferroalloys, etc. The actual production of the product starts with the management of the electrode paste, strictly implements the operating procedures, regularly and quantitatively lowering the electrodes, and maintains the normal and stable operating parameters of the electric furnace at all times to ensure the high efficiency…

    12-21 2021

  • Application of Residual Pole in the Production of Electrode Paste

    The residual electrode is the part that must be replaced with a new anode from the electrolytic cell in order to prevent the steel claws from melting after the pre-baked anode has been used in the electrolytic cell for a period of time. After high-temperature roasting, the residual pole has higher mechanical strength and lower porosity than petroleum coke. Using residual pole as a raw material for the production of carbon products can improve the quality of carbon products to a certain extent. As the "heart" of the calcium carbide furnace, the electrode paste, which is called a carbon functional material, requires sufficient strength and thermal shock resistance. With the advent of the low-carbon era, it is an inevitable trend for large enclosed calcium carbide furnaces to replace small semi-closed calcium carbide furnaces and open calcium carbide furnaces. Therefore, higher requirements for the quality of electrode paste are also put forward. Rongxin Carbon has been specialized in producing electrode paste…

    12-21 2021

  • General technical index requirements for electrode paste

    Electrode occupies an important position in submerged arc furnace. The working conditions of the electrode are bad, the current passing through is high, the temperature difference between the two ends is large, and the production is affected by the impact of mechanical, electrical and charge collapse... Mechanical strength, higher electrical resistivity, better thermal shock resistance, oxidation resistance and smaller thermal expansion coefficient. Generally speaking, the quality of electrode paste is controlled by the following five indicators: 1. Ash: Ash is the residue of electrode paste when it is burnt to constant weight at 850℃-870℃. It belongs to inorganic minerals. It has high ash resistivity, poor strength, high power consumption, and large electrode consumption. In the event of a hard breaking accident, the ash content is a very important indicator, and the lower the better. 2. Volatile matter: Volatile matter refers to the mass loss of electrode paste under the condition of heating in isolation of air. Volatile matter is generally…

    12-20 2021

  • Matters needing attention when filling electrode paste

    The following points should be paid attention to when installing the electrode paste airtight paste: 1. Do not allow debris to enter the electrode 2. Proper paste height 3. Work harder 4. Appropriate temperature 5. Prevent overhang Before filling, the electrode paste should be broken, generally broken into small pieces of 80~100mm, so that the electrode paste block can pass between the two ribs smoothly. If the particle size is too large, the electrode paste suspension failure is likely to occur; if the particle size is too small, it is easy to cause the phenomenon of spraying. Use a forklift truck or special tools to transport the electrode paste to the calcium carbide furnace, and use an electric hoist to hoist the electrode paste into the electrode bucket. Pay attention to the safety of hoisting during loading. When installing electrode paste, be careful not to scatter the electrode paste on the equipment outside the electrode barrel, so as to avoid…

    12-20 2021

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