Basic knowledge of calcium carbide coke

Thread Content

Basic Knowledge of Calcium Carbide Coke Calcium carbide coke is the coke used as a conductor and heat source in the arc furnaces used for producing calcium carbide. Coke used for calcium carbide is added to the arc furnace, where, under the high temperatures generated by arc heat and resistive heat (1800–2200°C), it undergoes complex reactions with limestone to produce molten calcium carbide (calcium carbide). Its formation process can be expressed by the following reaction: CaO + 3C → CaC2 + CO – 46.52 KJ. The calcium carbide used in this process should have low ash content, high reactivity, high electrical resistivity, and appropriate particle size; moreover, it is necessary to remove as much powder as possible and reduce the moisture content. Its chemical composition and particle size should generally meet the following requirements: fixed carbon greater than 84%, ash content less than 14%, volatile matter less than 2%, and sulfur content less than 1. 5%, phosphorus content less than 0.04%, moisture content less than 1.0%. The particle size depends on the capacity of the arc furnace used for producing calcium carbide: Furnace capacity/KV·A – Particle size/mm: <5000: 3-12; 5000-10000: 3-15; 10000-20000: 3-18; >20000: 3-20. The acceptance rate for particle size should be above 90%.