紫金山金矿吸附贫液过氧化氢除氰沉铜半工业试验研究

Pilot industrial experimental study on cyanide removal and copper deposition by hydrogen peroxide in adsorption lean liquid in Zijinshan Gold Mine

采用过氧化氢氧化除氰沉铜工艺,对紫金山金矿吸附贫液进行了处理。其研究结果表明:在27.5%过氧化氢用量约为4.0 kg/m3,处理过程中不添加石灰时,总铜去除率83.52%,总氰化合物去除率90.57%,沉渣中铜品位为52.08%;处理过程中添加0.5 kg/m3石灰时,总铜去除率95.76%,总氰化合物去除率98.07%,沉渣中铜品位为20.09%。该工艺消除了吸附贫液直接返回堆浸场喷淋时因其铜含量高对金浸出率、吸附率等生产技术指标造成的不良影响。该工艺简单、清洁环保、设备投资小、实施速度较快、技术先进、经济可行,适合对含铜、含氰吸附贫液的短期应急处理。

Hydrogen peroxide is used to oxidize and remove cyanide and precipitate copper, for the treatment of adsorption lean solution in Zijinshan Gold Mine. The results show that when the dosage of 27.5 % hydrogen peroxide is about 4.0 kg/m3 and without the addition of lime in the process,the total removal rate of copper is 83.52 % , and that of cyanide is 90.57 % ,copper grade of sediment is 52.08 % ; with 0.5 kg/m3 lime added, the total copper removal rate is 95.76 % ,and cyanide 98.07 % ,copper grade of sediment is 20.09 %. The process eliminates the ad- verse effects on the technical index, such as the gold leaching rate and adsorption rate, caused when adsorption lean solutions directly go back to heaps for spraying because of its high copper content. The process is simple,clean,environment-（riendly, needs small equipment investment, could be fastly implemented, it is technically reliable, economical and feasible, and suitable for short-term emergency treatment of adsorption lean liquid containing copper and cyanide.