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For the copper-containing acidic wastewater generated during underground mining process of a copper mine, a new processing technique consisting of copper recovery by replacement with iron filings, neutralization of alkaline tailings overflow, and treatment of coagulation and sedimentation was studied, and the effects of adding amount of iron filings, replacement reaction time and stirring speed on copper replacement rate were all investigated. And then, experiments on the proportion of required alkaline tailings overflow for neutralization of acidic wastewater and on toxicity characteristic leaching of neutralized sludge were performed, as well as the kinetics of replacement process was also studied. The results show that this new processing technique can produce sponge copper grading 35.6% Cu at 92.7% recovery, and the acidic wastewater after treatment can be up to the standard and directly discharged, with the cost of treatment agent at 0.95 yuan/t. Due to no hazardous waste generated, this processing technique can bring remarkable economic and environmental benefits.

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针对某铜矿开采过程中井下产生的含铜酸性废水，开展了铁屑置换回收铜-碱性尾矿溢流水中和-混凝沉淀联合处理新工艺研究，考察了铁屑投加量、置换反应时间、搅拌转速等因素对铜置换率的影响，并进行了碱性尾矿溢流水中和酸性废水配比条件实验、中和污泥毒性浸出实验及置换过程的动力学研究。结果表明，新工艺可获得铜品位35.6%、铜回收率92.7%的海绵铜，酸性废水处理后达标排放，其处理药剂成本为0.95元/t，且无危险废物产生，具有显著的经济效益和环境效益。

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李懋（1989—），女，湖南衡阳人，工程师，主要从事有色金属矿山选冶工艺研究及环境保护工作。

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李懋（1989—），女，湖南衡阳人，工程师，主要从事有色金属矿山选冶工艺研究及环境保护工作。

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