Raw materials is an important procedure in the production process of carbon, calcination operation is carbon raw material for high temperature in the absence of air. In the calcination process, changes of various carbonaceous materials structure and element group Chengdu occur a series of depth, so as to improve the physical and chemical properties of their. Calcined petroleum coke quality of product quality of carbon materials and the process of technical indicators have great influence, so to ensure the quality of raw materials is an important premise to guarantee the quality of the final product.
The purpose of calcination:
1) raw materials out of the volatile and water. After calcination volatile below 0.5%, moisture below 0.3%.
Calcined coke volatile matter and water represents the degree of calcination, not up to the requirements in the roasting will appear when the two contraction, the formation of cracks.
2) increase the density and mechanical strength of materials. True density more than 2.00g/cm3.
Influence of coke true density of final product real density of calcined, poor mechanical strength bulk density low, influence of molding mainly molding difficult, within the required time block height not up to the requirements, the influence of aluminum electrolytic tank operation, main show is falling.
3) enhancing the conductivity of materials.
Calcined coke resistance influence the final product resistivity.
4) improve the chemical stability of raw materials. Improve antioxidant properties.