Sustainable Mining and Metallurgy

In this paper, the causes of secondary pollution resulting from hazardous wastes incineration in rotary kiln were analyzed, and a cooperative hazardous wastes treatment scheme by “rotary kiln incineration + side blowing furnace smelting” was proposed to eliminate the secondary pollution resulting from rotary kiln incineration; finally, a study was made on the scheme from the aspects of environmental protection, investment and return on investment. The study shows that the secondary pollution is mainly caused from the complex compositions of hazardous wastes, the incineration temperature of rotary kiln is relatively low and cant reach the value needed for vitrification of those materials with high melting points. While in the process of “rotary kiln incineration + side blowing furnace smelting”, the smelting slag has been vitrified, the hazardous elements therein have been solidified in the vitreous slag, without permeation into the natural environment, and the smelting slag becomes general solid waste. The process has efficiently solved the secondary pollution caused by rotary kiln incineration. By adding cost of about 10% on the basis of the rotary kiln incineration system, good environmental and economic benefits can be obtained.