中国有色冶金

The essence of copper slag pyrometallurgical dilution technology is to add pyrite or carbonaceous reducing agent to high-temperature copper slag, so that the magnetic iron in the slag is reduced to FeO, and copper is gathered in the form of copper matte, and finally copper is separated from the slag phase. As a renewable resource, biomass is the preferred material for carbonaceous reductants. In this study, the iron silicon olivine slag was used as raw material, and the effects of biomass and pulverized coal on the reduction of copper slag were compared by single factor condition experiment. The effects of different smelting conditions such as biomass ratio, calcium oxide ratio, silica ratio, reduction temperature and reduction time on the recovery rate of copper in slag were investigated. The results show that under the optimal experimental conditions of reduction temperature of 1310℃, holding time of 120min, biomass ratio of 1%, calcium oxide ratio of 0.5%, silica ratio of 0.5%, and pyrite ratio of 1%, the copper content in the upper layer of the slag is reduced from 1.49% to 0.42%, which achieves the effect of direct reduction of copper slag by pulverized coal.From the perspective of environmental benefits, biomass is more suitable as a carbonaceous reducing agent for copper slag dilution than pulverized coal.