难处理金矿中伴生矿物对氰化浸出的影响

对金矿石中常见的几种伴生矿物在氰化浸出中的影响进行了分析,同时采用化学试剂配制标准液的方式,考察了Fe2+,Cu2+,As3+对氰化物消耗的影响.试验结果表明:铁矿物中,磁黄铁矿对氰化浸出的影响较大,使溶金速率下降28.1%,氰化物耗量增加4倍,而黄铁矿与赤铁矿对氰化浸出的影响较小;铜矿物中,黄铜矿与辉铜矿对氰化浸出都具有很大影响,其中辉铜矿可使溶金速率下降36.81%,氰化物耗量增加10倍;砷矿物中,雄黄与雌黄对氰化浸出极其有害,使溶金速率分别下降41.95%和49.90%,氰化物耗量分别增加13.8倍和15.0倍,相反毒砂在氰化体系中比较稳定,对氰化浸出的影响较小.离子耗氰试验中,Fe2+...

Effect of Associated Minerals on Cyanide Leaching Gold in Refractory Gold Ore

Several common associated minerals in refractory gold ore were tested to analyze their effects on cyanide leaching.The effects of Fe2+,Cu2+,As3+ on the consumption of cyanide were analysed by standard solution of chemical reagents.The results showed that pyrrhotite has the greatest effect on cyanide leaching in iron minerals,which decreases gold dissolution rate by 28.1% and increases cyanide consumption by 4 times.Pyrite and hematite have little effects.Chalcopyrite and chalcocite have great effects on cyanide leaching in copper minerals.Chalcocite decreases gold dissolution rate by 36.81% and increases cyanide consumption by 10 times.Realgar and orpiment are extremely harmful to cyanide leaching in arsenic minerals,which decreases gold dissolution rate by 41.95% and 49.90% respectively,and increases cyanide consumption by 13.8 times and 15.0 times.On the contrary,arsenopyrite is more stable in the system,and has little effect on cyanide leaching.In ion consuming cyanide test,Fe2+ and Cu2+ consume a lot of cyanide in the system,while As3+ isn’t reactive with cyanide and cannot cause cyanide consumption.Thus the formation of thio-cyanate is the main reason of arsenic minerals consuming a lot of cyanide.