大水量离子交换除氰工艺的研究设计

STUDY AND DESIGN OF THE PROCESS OF REMOVAL OF CYANIDE BY IONEXCHANGER WITB LARGE FLOW ION QUANTITY

将通常的苯乙烯强碱树脂先转变成铜氯络离子形态,利用离子交换和络合反应可有效地去除废水中游离的和络合的氰化物,使处理后的废水中氰离子含量小于O.5mg/L,铜离子含量小于1mg/L,达到了排放要求。为此目的研究设计了一套自动控制的真空系统,用于再生阴、阳树脂。再生回收的氰化钠和铜氰化钠可直接在镀槽内回用。采取共用再生系统的组合式工艺设计可降低投资费用,合理处理和利用酸再生废液,消除了二次污染。

Strong alkaline PS resin is first turned to the form of Cu-CL complex ions, and then free and complex cyanides in effluent could be removed effectively through ion exchanger and co- mplexation, with a result of CN^- content in effluent<0.5mg/L and Cu^(2+)<1mg/L, which conform to the requirements of discharge regulations. For regenerating anion and cation resins, an auto-control vacuum system has been designed. The recovered sodium cyanide and sodium cuprous cyanide can be directly returned to the plating tank. The combination of technological design with common regeneration system may reduce costs, treat and use regenerated solution reasonably, and eliminate secondary contamination.