| Abstract Scope |
Aluminum dross is a hazardous solid waste produced in the process of electrolytic aluminum or cast aluminum production, with annual emission of more than 3 million tons. Fluoride, aluminum nitride and soluble salts contained in aluminum dross lead to environmental pollution and health hazard. In this paper, a method of harmless treatment of secondary aluminum dross was proposed. The effects of temperature, liquid-solid ratio, time and stirring speed on removal rate of nitrogen, fluorine and chlorine were investigated in detail. The results showed that the removal rates of each element reached the maximum at temperature of 80℃, liquid-solid ratio of 3:1, time of 2 h, and stirring speed of 400 r/min. The removal rates of nitrogen and fluorine were 62.8% and 77.6%, respectively, and the chlorine was completely removed. The research provides possibility for the harmless treatment and resource utilization of secondary aluminum dross. |