含铜蚀刻废液的回收与利用

Recovery and Utilization of Cupriferous Etching Wastewater

某酸性蚀刻废液和碱性蚀刻废液混合得到沉淀物———Cu(OH)Cl,过滤后该沉淀物可与浓H2SO4反应生成CuSO4产品,而残留废水中的Cu2+可通过Na2S去除。实验室小试结果表明,当该酸性和碱性蚀刻废液以5∶13的体积比混合时,可以使Cu(OH)Cl得到最大限度的沉淀(96.53%的铜沉淀);当以15∶4的质量比(Na2S∶Cu2+)投加Na2S时,残留废水中的Cu2+可以最大限度的去除(98.78%的铜离子得到去除)。此后的工程实践对具体的工艺操作进行了调试,验证了此工艺回收与利用含铜蚀刻废液的可行性。

Mixing certain acidic etching wastewater with certain alkaline etching wastewater can precipitate Cu（OH）Cl which, when filtrated, can react with strong H2SO4 to yield CuSO4 product. Cu^2＋ in the residual wastewater can be removed by Na2S. Bench-scale experiment revealed that when the acidic and alkaline etching waste liquids are mixed by the volumetric ratio of 0. 385, Cu（OH）Cl can be precipitated maximally with 96.53 percent of copper precipitated and that Cu^2＋ in residual wastewater can be eliminated to the highest degree, with 98.78 percent of Cu^2＋ eliminated, when Na2S is added by the mass ratio of 15 ： 4 （Na2S ： Cu^2＋ ）. The subsequent engineering practice has involved break-in to determine the detailed process conditions, verifying the feasibility of this process for recovering and utilizing cupriferous etching wastewater.