Before filling, the electrode paste should be broken into 80~100mm small pieces, so that the electrode paste can pass smoothly between the two ribs. If the particle size is too large, it is easy to cause electrode paste suspension failure; If the particle size is too small, it is easy to cause spray paste. It is better to buy the finished material of electrode paste. If the material supplied by the manufacturer is of qualified particle size, it can be directly filled. The powder of broken electrode paste is reduced, the utilization rate of electrode paste is improved, and the cost of calcium carbide is reduced. Use a forklift to transport the trolley or special tools to the calcium carbide furnace, and use an electric hoist to hoist it into the electrode barrel. Pay attention to hoisting during loading *. When adding electrode paste, pay attention not to scatter the electrode paste on the equipment outside the electrode barrel, so…
08-02 2022
The self baking carbon block for blast furnace is mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as binder, and electrode paste through calcination, batching, kneading, molding, roasting, graphitization, and machining. It is a conductor that releases electric energy in the form of electric arc in the electric arc furnace to heat and melt the furnace charge. According to the quality carbon product index, it can be divided into ordinary power, high power, and ultra-high power. Graphite electrode includes: ordinary power graphite electrode. Graphite electrodes with current density lower than 17a/ cm2 are allowed to be used, which are mainly used in ordinary power electric furnaces for steelmaking, silicon smelting, yellow phosphorus smelting, etc. It is made from petroleum coke, anthracite and metallurgical coke with coal tar pitch as binder. Some electrode pastes are used as conductive electrodes in various continuous self baking electric furnaces; Some anode pastes are used for continuous self baking…
08-02 2022
Electrode paste is a self baking electrode for ferroalloy furnace and calcium carbide furnace as a consumable conductive material, which is roasted into a conductive electrode for smelting by generating heat through current Specifications and indicators: Paste 1 (thd-1): Ash content (ash) is less than 5.0%, Volatile matter (V.M.) 12.0% - 15.5%, Compressive strength 1 (compressive strength) above 7.0Mpa, Resistivity 68 μ Below Ω m, The bulk density is above 1.36g/cm3. 2). Paste 2 (thd-2,): Ash content (ash) is less than 6.0%, Volatile matter (V.M.) 12.0% - 15.5%, Compressive strength is more than 15.7mpa, Resistivity 75 μ Below Ω m, The bulk density is above 1.36g/cm3. 3). Paste 3 (thd-3): Ash content (ash) is less than 7.0%, Volatile matter (V.M.) 9.5% - 13.5%, Compressive strength is above 19.6Mpa, Resistivity 80 μ Below Ω m, The bulk density is above 1.36g/cm3. 4). Paste 4 (thd-4): Ash content (ash) is less than 9.0%, Volatile matter (V.M.) 11.5% - 15.5%, Compressive strength is…
08-01 2022
Overall overview of carbon electrode paste Market Northeast low sulfur petroleum coke continues to implement large-scale preferential policies. Although on the surface, the price of low sulfur calcined coke remains stable for the time being, the actual calcined coke has also begun to implement large-scale preferential policies, and the price has actually been reduced. In the off-season, steel prices are adjusted and operated in a short-term or weak way, and it is expected that it will be difficult to reverse in the short term. On the one hand, the sales of low sulfur calcined coke are blocked, on the other hand, it is difficult to collect funds and lack of funds. This week, the medium and high sulfur calcined coke market has the intention to increase the price, because the raw material petroleum coke market is rising, and the raw material inventory of medium and high sulfur calcined coke manufacturers is decreasing, so some manufacturers are beginning to be constrained…
08-01 2022
Carbon equipment products electrode paste products can be divided into two categories: Electrode paste is an important consumable conductive material for the production of calcium carbide and ferroalloy. In terms of its use nature, it is a "self baking electrode". At present, the thermoelectric furnace consumes about 45kg electrode paste for each ton of ferrosilicon containing 75% Si, and about 30kg electrode paste for each ton of calcium carbide. The main raw materials for producing electrodes are anthracite, metallurgical coke and coal and coal tar pitch, which can be divided into two categories according to different formulas: 1) standard and non-standard electrode pastes: standard electrode pastes are mainly used in open ferroalloy furnaces and medium and small calcium carbide furnaces, and medium temperature asphalt is used as binder; Non standard electrode paste is mainly used in large open calcium carbide furnace. Its dry material particle composition is the same as that of standard electrode paste. However, in order to appropriately…
07-27 2022
Introduction to the production of electrode paste: electrode paste is a product with simple process and complex technology in carbon production. First, the electrode paste is the finished product after kneading and forming. Unlike other carbon and graphite products, when defects appear in the previous process, they can be made up by roasting, graphitization or even impregnation. Second, the electrode paste is directly used by the user, and the function of carbon products is played by forming electrodes after the user completes the use process. However, the users of electrode paste are very different: the furnace type is different; Different production products; Different regions; Different environment; The season is different, and the technical level of operators is also different. The so-called: it is difficult for everyone to adjust. It is very difficult to make the electrode paste production enterprise adapt to such complex use conditions. Therefore, the production process of electrode paste seems to be relatively simple, but it needs…
07-27 2022
Why is there stratification of coarse and fine particles in electrode paste? At present, the diameter of the electrode of the large closed calcium carbide furnace to be developed is relatively large, and the working length is relatively long. The tensile force generated by its own weight is larger, which requires high mechanical strength, and it also needs to re regulate the new compressive strength control index; Now energy conservation has become a national policy. The national standard for the energy consumption index of large closed calcium carbide furnace is quite strict, so the electrode paste should have a relatively small resistance coefficient to reduce the loss of electric energy. Therefore, the original control index of the electrode paste needs to be changed. The height of electrode paste refers to the height from the upper end of electrode clip to the top of electrode paste. If the electrode paste is too high, the coarse and fine particles in the electrode…
07-26 2022
What effect does the quality of electrode paste have on the electrode? The following editor will explain to you: 1. The ash bonding strength of the electrode paste is poor, and the bonding force in the place where the ash is concentrated is even worse. This place consumes quickly and is easy to be mechanically strained to cause hard fracture. Therefore, the ash index should be kept ≤ 3. 2. If the softening point of electrode paste is low, the coking value after sintering is low, and the motor strength is also poor, it is easy to cause electrode accidents. 3. The high resistivity of the electrode paste means that the graphitization degree of the electrode paste is low, the conductivity is poor, the oxidation resistance of the electrode is also poor, and the roasted electrode is rigid, and the electrode is easy to break.
07-26 2022
Electrode paste is a conductive material used for electric furnace equipment such as ferroalloy furnace and calcium carbide furnace. It is not energy, but material. Energy refers to the substances that provide energy conversion to nature, such as wind energy, hydropower and solar energy. So electrode paste is not energy.
07-25 2022
What are the requirements for the height of electrode paste? The editor will explain the following precautions for you: (1) The measurement shall be carried out twice per shift, once after shift handover and once during shift, and records shall be made. (2) The measurement position of each shift should be in the same position (inner triangle or outer triangle). (3) Each shift should decide how much electrode paste to install according to the height of electrode paste. (4) The measuring personnel should be careful not to contact the two-phase electrodes at the same time to prevent electric shock. (5) The measurement shall be accurate.
07-25 2022
A paste that binds solid carbon materials with a binder and begins to soften at about 60 ℃. The raw materials for making electrode paste include solid carbon materials and adhesives. Solid carbon materials include anthracite, coke (metallurgical coke, petroleum coke and asphalt coke) and graphite electrode chips (graphite). Anthracite is the main raw material of electrode paste, which can improve the quality of electrode paste.
07-24 2022
About the production process of electrode paste, We are will roughly explain to you: Crushing of raw materials (petroleum coke, coal, etc.) - grinding - Screening - batching - kneading (adding dissolved medium temperature asphalt to dry materials, a mechanical mixing process under a certain temperature maintained by steam heating) - forming - finished products The impact on the environment in the production process mainly includes: the pollution of dust in the crushing grinding screening process to the atmosphere, the noise pollution generated by mechanical operation, the pollution of asphalt smoke generated in the mixing and molding process to the atmosphere, and the pollution of cooling water to surface water, etc. The electrode paste production process has a serious impact on the environment, so we should be cautious in making this kind of environmental assessment report, and the pollution prevention and control measures should be in place. Purpose: Electrode paste is a conductive material for ferroalloy furnace, calcium carbide furnace…
07-24 2022
Electrode paste is used in open and closed submerged arc furnaces as a continuous self baking electrode to produce calcium carbide, ferroalloy and other products. The annual output is 7000 tons. Implement the standards of the Ministry of Metallurgy: yb/t5215 ~ 1996 (and refer to the user's industry standards). 1> Non standard electrode paste: ash and volatile are provided according to users' and industry standards. 2> Airtight paste: thd-1 and - 2. 3> Special paste and semi graphitized paste of all electric calcined materials: it is provided according to the user's index value, and the ash and volatile matter are provided according to the user's requirements and industry standards. Ash can be promised 2%. The supply price of paste products shall be based on the model cost of raw materials, which shall follow the market and be implemented through negotiation. Note: low grade paste products with ash content higher than 6.0 are no longer produced.
07-23 2022
Why is there such a big gap in the volatile matter detected when the same amount of asphalt is added to the electrode paste in the production process? First, because the electrode paste is made of different aggregate particles bonded by asphalt, the particle size leads to heterogeneity, so the sampling is difficult to be representative Second, the thickness of powder, the error of ingredients, the length of kneading time, and the volatile of raw materials in the production process will cause volatile fluctuations The third is the error introduced in the process of sample preparation, reduction and analysis. The combination of these kinds of errors will cause the error of volatile greater than 1%, so volatile is a range rather than a fixed value. Some manufacturers claim that volatile can be controlled at 0.5%, which is unscientific. Too much asphalt and too much volatile will cause slow roasting of the electrode, which is easy to lead to the soft…
07-23 2022
2. Self baking electrode and electrode paste. 2.1 requirements for the use of electrodes in thermoelectric furnaces Taking electric energy as the main heat source, mining reduction electric furnace (submerged arc furnace), reducing ore with carbon as reductant, and producing deoxidizer and alloying agent required by iron and steel industry is the process of ferroalloy production in submerged arc furnace. The high temperature and heat energy required for the production of ferroalloys are usually converted after the electric energy is sent into the furnace through the self baking electrode. Self baking electrode is the basic condition and premise of smelting ferroalloy in submerged arc furnace. In view of the continuous operation of high-temperature production, the submerged arc furnace usually operates continuously for several years. Therefore, the self baking electrode of the electric furnace is required to be able to transmit power continuously. The quality, performance, roasting technology and conditions of electrode paste should meet the technical requirements of production. 2.2…
07-22 2022
How much more proportion * of residual anode is added to the electrode paste? And in what form is it added? Residue is mainly used for making aggregates. The particles are large, small and medium in proportion, but this thing can't be told. It's a secret. If it is used for grinding, the cost is high, and if it is used for dust collection, the ash content is high, which has a great impact on the resistance. When adding into the furnace, the fine particles should be screened out to avoid the increase of ash content and resistivity.
07-22 2022
People first pay attention to ash content in the index inspection of electrode paste, and should be updated to pay attention to specific resistance first. Because the purpose of electrode paste is to make conductive materials, and the index of conductive materials should first pay attention to the specific resistance. Although there is a certain correlation between ash content and specific resistance, it is not always positive. The relationship between ash content and specific resistance is affected by many factors, such as material itself, ash composition, processing temperature, material ratio, product density, etc. Even the same material (the same ash content) has different specific resistance at different temperatures. Electrode paste is a relatively simple product in the production of carbon products, but their production links are basically the same from the calcination of raw materials to crushing, screening, and the front end of ingredients. And it is very important, which directly affects the output of finished products, production costs, and…
07-21 2022
Application and production points of electrode paste Electrode paste is a product with simple process and complex technology in carbon production. First, the electrode paste is the finished product after kneading and forming. Unlike other carbon and graphite products, when defects appear in the previous process, they can be made up by roasting, graphitization or even impregnation. Second, the electrode paste is directly used by the user, and the function of carbon products is played by forming electrodes after the user completes the use process. However, the users of electrode paste are very different: the furnace type is different; Different production products; Different regions; Different environment; The season is different, and the technical level of operators is also different. The so-called: it is difficult for everyone to adjust. It is very difficult to make the electrode paste production enterprise adapt to such complex use conditions. Therefore, the production process of electrode paste seems to be relatively simple, but it needs…
07-21 2022
1) The ash content of electrode paste is high, and the bonding strength of electrode paste is poor. Where the ash content is concentrated, the bonding strength is even worse. This place consumes quickly, and it is easy to be mechanically strained and cause hard fracture. Therefore, the ash content should be kept less than or equal to 3 2) If the softening point of electrode paste is low, the coking value of electrode paste after sintering is low, and the electrode strength is also poor, which is easy to cause electrode accidents. 3) The high resistivity of the electrode paste indicates that the degree of graphitization of the electrode paste is low, the conductivity is poor, the oxidation resistance of the electrode is poor, and the electrode after roasting is rigid and easy to break.
07-20 2022
The new steel bar electrode paste escort barrel is a steel bar electrode paste escort barrel smelting method that is reformed and designed on the basis of the iron sheet electrode paste smelting method commonly used in China's current calcium carbide and ferroalloy production industry. It uses a small amount of steel bars to assemble and weld the electrode main skeleton to replace the expensive iron sheet consumption. Compared with similar equipment, its shape can be reduced by two fifths. The inner wall of the escort barrel is designed with special materials, which is not bonded with electrode paste, but also a good insulator. The electrode * point is equipped with a temperature monitor to control the temperature changes of each layer with different heights during the baking process. The embedded reinforcement electrode paste, with the cooperation of the pressure cylinder of the top mechanical device, is in accordance with the requirements of the process and technical indicators, and the…
07-20 2022
(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
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
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
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
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
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
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
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
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 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
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
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
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
【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
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
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
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
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
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
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
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 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
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 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
