Abstract
Plating waste liquid collected for disposal from electroplating plants, contains large amounts of complex cyanide and organic matter in varying concentration so.Such liquid was conventionally treated using a boil-down method but this involved problems with the complex cyanide that remained in the resulting sludge and the high cost of treatment.We applied thermal-hydrolysis to treatment of such waste liquid and succeeded in decomposing the complex cyanide and removing the metal from it by adding two-step sulfide division to the process.
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