Calcining method for preparing aluminum-electrolytic pre-baked carbon anode petroleum coke

Abstract

The invention relates to a calcining method for preparing aluminum-electrolytic pre-baked carbon anode petroleum coke, which is characterized in that calcination temperature is controlled at 1300-1350 DEG C; the fluctuation range of temperature is not larger than 30 DEG C; discharging amount is controlled by the volatile matter content in the petroleum coke, and the volatile matter is controlled in 10-15%; the secondary ventilation quantity of a rotary kiln is 2000-2600 m3 / h, and the third ventilation quantity is 1600-2200m3 / h; and negative pressure is controlled in 20- 40Pa. the invention causes a calcining process to obtain system optimization, the coke performance after calcination is greatly improved, the oxidation resistance and the electrical conductivity after calcination are significantly increased, and the true density is more than 2.05g / cm3. The produced anode quality is more uniform and stable, the ratio of first-grade products is significantly increased, and the electrolytic carbon consumption is greatly reduced.

Description

technical field [0001] The invention relates to a method for calcining petroleum coke for preparing aluminum electrolytic prebaked carbon anodes. Background technique [0002] Petroleum coke calcination is one of the important processes in the production of prebaked carbon anodes. The quality of petroleum coke calcination directly affects the quality of carbon anodes. The main purpose of calcination is to eliminate volatiles in raw materials and improve the density and mechanical strength of carbonaceous raw materials. Improve the conductivity and chemical stability of raw materials. When petroleum coke is calcined, a large amount of volatile matter is removed, and at the same time, the elemental composition of petroleum coke changes. The volatile components in petroleum coke are mainly hydrocarbons. As the calcination temperature increases, the composition of the volatile components also changes. The hydrogen content in the volatile components continues to increase, while ...

AI Technical Summary

Problems solved by technology

At present, most domestic carbon enterprises use rotary kiln for calcination, which is characterized by large calcination capacity and low actual yield

Rotary kiln calcination, if the calcination process conditions cannot be well controlled, the chemical activity of the calcined coke will decrease, the powder specific resistance will be higher, the true density will be lower, the oxidation resistance will be worse, and the actual yield will be lower, which will lead to The quality of carbon anode decreases, the consumption of electrolytic carbon increases, and the amount of carbon residue increases, which will directly affect the current efficiency of the electrolytic cell, the energy consumption of electrolysis and the stable operation