Sustainable Mining and Metallurgy

Using zinc leaching residue as raw material, experimental research was conducted by RHF direct reduction and magnetic separation process. Press zinc leaching residue into pellets with reducing agents and binders in a certain proportion for reduction experiments. The results showed that under the conditions of carbon oxygen ratio of 1.2, reduction temperature of 1250℃, and reduction time of 35min, the zinc leaching residue was directly reduced to obtain metallized pellets. The volatilization rate of zinc exceeded 99%, the volatilization rate of lead exceeded 95%, the volatilization rate of indium was more than 79%, and the metallization rate of iron was more than 85%. The metallized pellets were subjected to magnetic separation under the conditions of first grinding for 10min, magnetic field strength of 0.18T, second grinding for 15min, and magnetic field strength of 0.12T, resulting in iron concentrate powder with an iron grade of 87.12%. The iron recovery rate was 83.04%, and the experimental indicators were good. The comprehensive recovery and utilization of valuable elements such as lead, zinc, indium, and iron in zinc leaching was realized.