氨浸法从硫铁矿烧渣中回收铜

Recovery of Copper from Pyrite Cinders by Ammonia Leaching

硫铁矿烧渣富含铁、金、银、铜等有价金属,具有重要的综合回收利用价值,采用硫酸浸出回收铜时会造成铁的损失,且增加了后续氰化回收金银保护碱的消耗,生产成本高。为解决这些问题,采用氨浸法回收硫铁矿烧渣中的铜,并研究了浸出时间、矿浆pH值等工艺参数对铜浸出率的影响。结果表明:浸出时间、矿浆pH值、液固比、搅拌速率和浸出温度对硫铁矿烧渣中Cu的浸出率有显著影响,在pH值10.81、液固比7∶1、浸出时间1 h、搅拌速率600 r/min、温度20±2℃的最佳浸出条件下,铜的浸出率为82.66%,氨浸渣铁含量高,有利于制团炼铁。

Pyrite cinders enriched in iron,gold,silver,copper,and other valuable metals which have an important comprehensive recycling value.Recovering copper from pyrite cinders by sulfuric acid leaching will cause the loss of iron and increase the consumption of alkaline in subsequent cyanide process of gold and silver,leading to high production cost.In order to solve these problems,copper from pyrite cinders was recovered by ammonia leach,the effects of leaching time,slurry pH and other process parameters on copper leaching rate were studied.The results show that the effects of leaching time,slurry pH,liquid-to-solid ratio,agitation speed and leaching temperature on copper leaching were significant.Under the optimal leaching conditions of pH 10.81,liquid-to-solid ratio 7∶1,leaching time 1 h,agitation speed 600 r/min,temperature 20±2℃,the extraction rate of copper was 82.66%,and the iron content in ammonia leaching residues was high,which was beneficial to pyrite cinders pellet for iron making.