Sustainable Mining and Metallurgy

Aluminum ash is a by-product produced in the process of electrolytic aluminum production, which contains high content of alumina. Chinas electrolytic aluminum industry produces a large amount of aluminum ash every year. The traditional landfill method not only has a bad impact on the environment, but also causes a waste of resources.Waste acid is a kind of hazardous waste, the traditional neutralization process has the problems of large slag production and high cost of subsequent treatment. This paper reviewed the recycling process of aluminum ash and waste acid, and introduced the detailed process flow of preparing polyaluminum chloride by using waste HCl and waste H2SO4 with aluminum ash. The indexes of the water purifying agent prepared by this process can meet those of the national standard.This method realizes the recycling of waste, and has good economic and environmental benefits.