Ferroalloys extraction by RKEF technology from copper slag tailings
China is a major producer of copper smelting,with annual output of about 15 million tons of copper slag tailings,which are rich in a variety of valuable metals.In order to effectively recover the valuable metals in copper slag tailings,realize the reuse of solid waste resources and reduce environmental pollution,copper slag tailings were used as raw materials,and RKEF technology(prefabrication pellets → rotary kiln reduction roasting → electric fur-nace reduction melting)was used to reduce and extract the valuable metals in copper slag tailings.The optimum smelting parameters were explored using coal as reducing agent and limestone as flux.Finally,ferroalloy with Fe mass fraction greater than 95％was obtained by reduction and melting in electric furnace,which can be used as raw material for iron and steel smelting.This research extends the resource utilization potential of copper slag tailings to the steelmaking industry,which lays a theoretical and practical foundation for the comprehensive utilization of cop-per slag tailings.
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