Study on synergistic roasting-magnetic separation enrichment for separation of gold and iron from carbonaceous gold concentrates and cyanide tailings
To address the issues of low gold leaching rates due to high carbon content in carbonaceous gold con-centrates and high iron content in cyanide tailings,a synergistic roasting-magnetic separation technology for carbona-ceous gold concentrates and cyanide tailings was proposed to separate and recover gold and iron.The research results showed that under the conditions of a mass ratio of carbonaceous gold concentrate to cyanide tailings of 1∶1,roasting tem-perature of 800℃,roasting time of 60 min,calcium carbonate mass fraction of 10%,grinding fineness of-0.074 mm accounting for 90%,and magnetic field intensity of 0.20 T,the gold leaching rate reached 82.47%,the iron grade of iron concentrate was 60.15%,and the iron recovery rate was 75.58%.During roasting,carbonaceous matter and pyrite in carbonaceous gold concentrates acted as reducing agents to reduce hematite in cyanide tailings to magnetite,reducing the"preg-robbing"effect of carbonaceous matter and the encapsulation of gold minerals by pyrite.This method not only recovers iron minerals from cyanide tailings but also significantly improves the gold leaching rate.It achieves the comprehensive recovery and utilization of carbonaceous gold concentrates and cyanide tailings,with low-cost and simple process,providing a new approach to the comprehensive utilization of carbonaceous gold ore resources.
NETL
NSTL
万方数据
维普
