Sustainable Mining and Metallurgy

A large amount of purified waste dust and waste tar are produced in the production process of aluminum electrolysis anode block and cathode carbon block. The fixed carbon content of dust is more than 85%, which has high secondary resource utilization value. Containing a variety of inorganic and organic compounds, waste tar is a flammable product that can be used as a fuel, and binder for carbon products and other synthetic fiber raw materials. In this paper, a process for preparing formed coke by synergistic utilization of dust collection dust and waste tar was studied. With dust collection dust as raw material, waste tar and asphalt as binder, through stirring, kneading, briquetting, roasting in high temperature resistance furnace, and finally forming formed coke. The test process shows that the formed coke produced by this process can achieve the expected technical indicators. The fixed carbon content of the formed coke product is ＞ 96%, the ash content is ＜ 4%, and the sulfur content is ＜0.5%. It can be used as a high-quality recarburizer for steel mills, other metal smelting reductants or high-calorie fuels. This method can achieve high-value utilization of electrolytic aluminum solid ( hazardous ) waste, which is of great significance for energy conservation and emission reduction in the electrolytic aluminum industry.