electrode paste for calcium carbide production
Do not change the production formula of electrode paste for calcium carbide production easily
The production formula of electrode paste for calcium carbide production should not be changed lightly. Changing the formula should be tested many times. Small calcium carbide furnaces or ferroalloy furnaces can all use metallurgical coke or pitch coke plus a small amount of natural graphite to configure the electrode paste for calcium carbide production, but the consumption is larger.
For large or medium-sized calcium carbide furnaces and ferroalloy furnaces, the electrode paste for calcium carbide production should be prepared with anthracite and metallurgical coke. Adding a small amount of natural graphite or graphitized metallurgical coke to the formula of electrode paste for calcium carbide production will help improve the electrical and thermal conductivity of electrode paste for calcium carbide production. However, the preparation of earthy graphite in small and medium factories should be strictly controlled.
It should be noted that too much asphalt will cause the sintering speed of the electro-paste paste to not keep up with the needs of consumption, and it will easily lead to soft fracture. Electrode paste for calcium carbide production with too much binder will have high porosity and low strength after sintering, and will produce hard fracture under certain conditions. When the amount of binder is too small, the electrode paste for calcium carbide production will be sintered too quickly, the bonding force between the particles after sintering is poor, the strength is low, and it is easy to cause hard fracture. Comparing the two, the undesirable consequences of soft disconnection are more serious than those of hard disconnection. In the production, if the quality of the asphalt is not tested, the production quality fluctuates greatly, and users dare not use this kind of electrode paste for calcium carbide production lightly.
The kneading temperature should be stable, and the dry mixing and wet mixing time should be sufficient to allow the binder to fully penetrate into the pores of the carbonaceous raw material particles and form a “bonding film” uniformly on the surface of the particles. In addition, the kneading temperature is high, resulting in poor particle structure of the paste. </p><p> The ash content of electrode paste for calcium carbide production should be strictly controlled from the calculation of ingredients. Due to the poor quality of calcination in some factories, the quality of electrode paste for calcium carbide production has deteriorated. Because the increase in the ash content of the electro-paste will cause an increase in consumption.