Sustainable Mining and Metallurgy

The flue gas composition of cathode carbon block carbon roasting for aluminum is complex, which contains a large number of high concentration pollutants such as particulate matter, asphalt fume, sulfur dioxide and nitrogen oxides. In this paper, an ultra-low emission technology of asphalt fume was proposed. The raw material powder produced by cathode carbon for aluminum was used as the adsorption powder. The adsorbed asphalt powder was returned to the workshop to continue to be used as the production raw material. The process flow and key equipment of the technology were introduced, and the particle size, specific surface area and adsorption effect of the adsorption powder were studied. The technology was applied in a carbon plant and operated stably for 6 months. Using this technology, zero emission of hazardous waste was achieved, and there was no pipeline blockage, paste bag and other phenomena. After the transformation, the concentration of particulate matter in the roasting flue gas decreased from 15.9mg/m3 to 1.7mg/m3, the concentration of sulfur dioxide decreased from 96.0mg/m3 to 13mg/m3, and the emission concentration of asphalt smoke decreased from 33.5mg/m3 to 12.8mg/m3. The flue gas treatment effect was good.