含铜低品位金矿除铜回收氰浸出工艺研究

Study on Leaching Process of Copper Removal and Cyanide Recovery from Low-grade Copper Bearing Gold Ore

传统工艺"氰化浸出-活性炭吸附-解吸-电积-提纯"难于处理含有氰化物易溶铜的含铜低品位金矿。采用"柱浸-贵液除铜回收氰-活性炭吸附金"工艺处理福建某含铜低品位金矿,以硫化亚铜沉淀形式除铜,络合氰化物经酸化为游离氰化物回收氰。结果表明,采用除铜回收氰工艺,与新制浸出液相比,各项指标接近;与未除铜工艺相比,金浸出率高10.81%,氰化钠耗量低78.30 g/t。回收的铜可以作为铜精矿,吸附贫液可返回循环使用。

The traditional process, cyanide leaching-activated carbon adsorption-desorption- electrodeposition-purificatio, is difficult to deal with gold ore containing low-grade cyanide soluble copper. A low-grade copper-bearing gold mine in Fujian province was treated by the column leaching-recovery of cyanogen from expensive liquid after removing copper-activated carbon adsorb gold process. Copper is precipitated as cuprous sulfide, and cyanide is recovered by complex cyanide acidification to free cyanide. Results showed that the indicators of the solution treated by the copper removal and cyanide recovery process are similar to newly prepared leaching solution. Compared with the process without copper removal, the gold leaching rate was improved by 10.81% and the sodium cyanide consumption reduced by 78.30 g/t. The recovered copper can be used as copper concentrate, and the adsorbed lean liquid can be recycled.