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When the current passes through the electrode itself, the electrode paste itself has a certain resistance to generate resistance heat, which is the main heat source for the firing of all calcium carbide furnace electrodes. This heat can be calculated according to this formula Q=4.), it can be seen that the size of the resistance heat is proportional to the square of the electrode current (secondary current), proportional to the electrode paste resistance, and proportional to the power delivery time. Theoretical estimation of electric energy of sintered electrodes in calcium carbide furnace. The electric energy used in the sintering of the calcium carbide furnace electrode accounts for about 3% to 5% of the total input power of the electric furnace, and each 1kg electrode paste sintered consumes about -4.18kJ) of heat. Taking an open calcium carbide furnace as an example, it consumes 180,000 kWh of electric power every 8 hours. The electric energy used for baking the electrode is about 6000~; h, if the production of 1t of calcium carbide consumes 30kg of electrode paste, the required electric energy is about 35kW.h. If it is a closed furnace, then the production of It calcium carbide consumes 25kg of electrode system, baking The electric energy required by the electrodes is about 29kW-h. It can be seen that the dense door calcium carbide furnace not only consumes less electrode paste, but also reduces electric energy consumption. Through the above estimation, the following conclusions can be drawn: the electric energy for producing lt calcium carbide dry-baked electrodes is about 30-35kW.h.

The sintering of the self-baking electrode has no obvious boundary. In order to operate and master the sintering of the electrode, according to the distribution of the baking temperature of the motor, it can be divided into three stages: softening section, volatilization section and burning stage.

(1) The temperature of the softening section is 25~200℃. At this time, the solid electrode paste gradually softens, the resistance increases, the strength decreases, and finally all is in a semi-fluid state. In the meantime, the water and low boiling point components in the electrode paste began to volatilize.

(2) The temperature of the volatilization section is 200-600℃. At this time, the electrode paste has fully melted to fill the pores between the electrode cylinder and the paste block. As the temperature rises, the resistance decreases continuously, the asphalt decomposes and volatilizes significantly, and the electrode paste gradually changes The thick is in a semi-coked state. Due to the cooling effect of the conductive clip, the outside of the electrode is lower than the center, and the rise is slower, which not only facilitates the volatilization of the volatile matter of the electrode paste, does not rush to coking but also makes the electrode maintain a certain degree of plasticity, with good filling, less pores, and high strength. It is also possible to make the electrode and the conductive clip mesh well without causing puncture fire. This stage is the key stage of electrode baking. If the temperature is too low, the electrode voltage is released too fast, the current, and the load is large, it is easy to cause electrode flow paste or soft-break accidents. If the temperature is too high, the electrode voltage is released too slowly, the current and the load are large, it is easy to cause the electrode to burn out, burn out the conductive clip and the electrode barrel, so that the electrode can not be put down, and even a hard break accident may occur.

(3) The temperature of the sintering section is 600~800℃. At this time, the electrode paste has been coked and a small amount of volatiles are discharged. The strength of the electrode is increasing, and the resistance is gradually decreasing, forming a carbon material electrode with better conductivity. When the electrode is completely pressed out of the conductive clamp, it is heated by the radiant heat of the furnace mouth, and the temperature around the electrode rises rapidly, and the temperature at the center and outside tends to be the same, maintaining a hard and good conductive electrode. When the electrode enters below the material surface and the temperature rises to 800~1200℃, the electrode is basically mature, and the conductivity and strength are further increased. It should be noted that in the specific operation of the calcium carbide furnace, the position of the electrode paste in the three stages is not fixed, the position is sometimes high and sometimes low, and the boundary is not obvious. If the operator has a high level of experience, the electrode sintering position will not change much. , There are fewer electrode accidents. If the operator is poor and lacks practical operation experience, the upper and lower positions of the three stages of electrode sintering fluctuate greatly, and electrode accidents will occur frequently.

CGM Carbon is a leading group company in China, focusing on the production and operation of carbon metallurgical material products, in accordance with industrial standards and customer requirements, providing fast quotations, reliable quality, competitive price products and delivery services as quickly as possible. It was founded in 1992 in Zhengzhou in the east of China. In order to play a greater role in the entire production and supply chain, we work closely with our customers. With more than 20 years of professional experience and expertise in the carbon metallurgy industry, the company is committed to research and development, and provides a series of high-quality, innovative, and cost-effective carbon and metallurgical products and solutions. At present, the main products are graphite electrodes, electrode pastes, forged petroleum coke and refractory materials. The product line includes carbon materials, graphite materials, refractory materials and water treatment materials. Annual output of 200,000 tons of electrode paste, 50,000 tons of graphite electrodes, 250,000 tons of calcined coke, 20,000 tons of refractory materials, etc. Welcome partners who are interested in cooperation to join us! CGM (Our company specializes in the production and sales of electrode products: electrode paste, graphite electrodes, etc.)