Smelting chlorination method applied to removal of copper from copper slags

Abstract

In order to reasonably utilize the iron resources of copper slags, the smelting chlorination process was used to remove copper from copper slags. Higher holding temperature and O₂ flow rate are beneficial to increasing copper removal rate. However, the Cu₂O mode is formed by the reaction of surplus O₂ and CuCl with O₂ flow rate increasing over 0.4 L/min, causing CuCl volatilization rate and copper removal rate to decrease. The resulting copper removal rate of 84.34% is obtained under the optimum conditions of holding temperature of 1573 K, residence time of 10 min, CaCl₂ addition amount of 0.1 (mass ratio of CaCl₂ and the copper slag) and oxygen flow rate of 0.4 L/min. The efficient removal of copper from copper slags through chlorination is feasible.

Keywords

copper slags / smelting chlorination / copper removal / volatilization / waste utilization

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