In the field of carbon anode production for aluminum, the production kiln of calcined petroleum coke is generally divided into a fixed bed and a rotary bed, wherein the fixed bed is mainly represented by a tank kiln, and the rotary bed is represented by a rotary kiln.
The volume density of calcined petroleum coke produced by the tank kiln is usually higher than that produced by the rotary kiln, which is mainly because that the residence time of the petroleum coke in the tank kiln is usually about 72 hours, and the heating rate is much slower than that of the rotary kiln. Therefore, the effusion rate of the volatile component is much lower than that of the rotary kiln, so that the calcined petroleum coke produced by which has a lower internal porosity and a higher volume density.
The final calcination temperature usually determines the true density of the calcined petroleum coke. In terms of the final temperature of the calcination, both the rotary and tank kilns have no obvious comparative advantages.