摘要
某黄金矿山氰化尾浆氰根含量50～70 mg/L,为了循环利用该低浓度含氰废水,降低氰化钠用量,减轻破氰系统运行负荷,进行了低浓度含氰废水循环利用试验研究.试验结果表明:将含氰废水补加至破矾矿浆工序,控制最终氰化矿浆浓度约25%,其工艺指标最优,氰化钠实际耗量0.91 kg/t,氰化钠耗量下降了0.21 kg/t,金浸出回收率为93.89%,金浸出回收率提高了0.92个百分点,可节约氰化钠药剂成本145.5 万元/a,破氰成本97.24 万元/a,环境效益及经济效益显著,达到了降本增效的目的.
Abstract
The cyanide content of cyanide tailings slurry in a gold mine is 50～70 mg/L.In order to re-cycle the low concentration cyanide-containing wastewater,reduce the dosage of sodium cyanide and re-duce the operation load of cyanide breaking system,the experimental study on the recycling of low concen-tration cyanide-containing wastewater is carried out.The test results show that the process index is the best when the cyanide-containing wastewater is added to the alum-breaking pulp process and the final cyanide pulp concentration is controlled to about 25%.The actual consumption of sodium cyanide is 0.91 kg/t,the consumption of sodium cyanide is decreased by 0.21 kg/t,the gold leaching recovery rate is 93.89%,and the gold leaching recovery rate is increased by 0.92 percentage points.The cost of sodium cyanide agent can be saved by 1.455 million yuan/a,and the cost of cyanide breaking is 97.24 million yuan/a.The environmen-tal and economic benefits are remarkable,and the purpose of reducing cost and increasing efficiency is achieved.
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