Sustainable Mining and Metallurgy

Based on the rapid development of new energy vehicles and the strong demand for nickel raw materials due to the development of high nickel content of ternary power batteries, the research on the production of low nickel matte by laterite nickel ore side-blown matte smelting is proposed. In this paper, the thermal decomposition behavior of gypsum was systematically studied by thermodynamics, and the effects of carbon to sulfur ratio and reaction temperature on CaS conversion were analyzed. The basic test of gypsum selective reduction of laterite nickel sulfide was carried out. On this basis, the expanded test of oxygen-enriched side-blown laterite nickel sulfide was carried out, and the reaction mechanism of gypsum selective reduction of laterite nickel sulfide and oxygen-enriched side-blown laterite nickel sulfide was summarized. The results show that the process of producing low nickel matte by direct reduction of nickel sulfide laterite ore with desulfurized gypsum in a short process is feasible. The process uses industrial solid waste desulfurized gypsum as a sulfurizer, which can make full use of Ca and S elements in the gypsum slag to achieve the goal of “green recycling and resource utilization of solid waste”. The nickel recovery rate is more than 90%, the cobalt recovery rate is more than 87%, the sulfur recovery rate is more than 75%, and the iron recovery rate is less than 60%, which can meet the requirements of nickel, cobalt The purpose of selective reduction, sulfuration and enrichment of iron.