Improvement of Carbothermic Reduction of Copper Smelting Slag and Valuable Constituents Recovery

In order to comprehensively utilize copper smelting slag, the effect of strengthening measures on reduction rate kinetics, magnetic separation reduced pellet and volatilization residual valuable constituents were investigated in present study. Milling for mechanical activation was most efficient method improve slag compared addition Na2CO3 catalyst high reactivity reducing agent. The metallization degree increased from 54.5% 75.5% when slag-coal mixture milled 30 s at 1100°C min. apparent energy 96.1 kJ/mol 153.5 kJ/mol. iron concentrate magnetically separated 1200°C had best quality. removal rates typical elements during direct reduction-magnetic decreased sequence Zn>K>Na>Cu. Secondary-dust captured flue gas contained 70.17 mass% Zn 11.99 Pb, which could meet requirements I grade zinc ore. dust existed form ZnO. productivity around 1.49%. application milling slag/coal composite can efficiency oxide quality Zn-rich secondary dust. This work help enhance utilization a more sustainable method.