Basic knowledge of carbon production

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1. What is the main function of anode carbon blocks used in aluminum electrolysis? Answer: Carbon blocks serve to conduct electricity and participate in electrochemical reactions in the electrolyzer. 2. What are the characteristics of carbon anode products? Answer: (1) High temperature resistance, good electrical and thermal conductivity; (2) Low coefficient of thermal expansion; (3) Stable chemical properties. 3. What is calcination? Answer: The process of subjecting carbon materials to high-temperature treatment under conditions that basically isolate them from air is called calcination. 4. What is the purpose of calcining petroleum coke? Answer: (1) Remove moisture and volatile components from the raw material; (2) Increase the density and mechanical strength of the raw material; (3) Improve the electrical conductivity of the raw material; (4) Enhance the antioxidant properties of the raw material. 5. What are the three temperature zones in a rotary kiln? Answer: Pre-tropical zone, calcination zone, cooling zone. 6. What is the volatilization mechanism of the volatile components in petroleum coke during the calcination process? Answer: A small amount begins to be released at 500°C to 600°C ； 800℃ is the peak of emission ； It is essentially exhausted at 1150–1250℃. 7. During normal production, what ranges should several key temperatures in the rotary kiln be kept within? Answer: Kiln head: