选冶联合工艺综合回收金的试验研究

Experimental Study on Comprehensive Recovery of Gold by Combined Process of Beneficiation and Metallurgy

针对某含铜钴的金多金属矿,采用铜优先—金钴混合浮选流程回收金,指标偏低。对流程中的浮选尾矿进行了多元素分析、粒度筛析及金属分布测定和工艺矿物学检查,发现粗颗粒中含有一定量的金,同时还有部分被氧化需要进行再磨再选和氰化浸出联合工艺对金进行回收。再磨再选得到的金钴精矿中金的回收率为6.93%;再磨再选尾矿经氰化浸出后浸渣金品位为0.33g/t,金作业浸出率为80.0%,对原矿金回收率为19.04%;"铜优先—金钴混合浮选—尾矿再磨再选—再选尾矿炭浸"的选冶联合工艺获得的金总回收率为95.38%。

For a copper-cobalt-bearing gold-polymetallic ore,the flowsheet of copper selective-gold and cobalt bulk flotation was used to recover gold,and the index was low.Therefore,multi-element analysis,particle size analysis,metal distribution determination and process mineralogy inspection were carried out on the flotation tailings in the process,and it was found that a certain amount of gold was contained in the coarse particles,and part of the gold was oxidized,which needed to be recovered by the combined process of regrinding and cyanide leaching.The recovery of gold in the gold-cobalt concentrate obtained by regrinding and reconcentration is 6.93%.The grade of gold in the residue after cyanide leaching of the tailings from regrinding and reseparation is 0.33 g/t,the leaching rate of gold is 80.0%,and the recovery of gold is 19.04%.The total recovery of gold is 95.38%by the combined process of copper selective-gold and cobalt bulk flotation-tailings regrinding and reseparation-reprocessed tailings CIL.