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The waste-plus-waste process for recovering metals from electroplating and other wastes.
Plating Surf Finish 1976 Jul; 63(7):38-43
Laboratory-scale research was conducted by the Bureau of Mines to develop a new process for treating electroplating and other wastes. Various acid and alkaline cyanide wastes were combined under controlled conditions to neutralize the wastes and precipitate the metals and cyanides. The metals were subsequently recovered for recycling. The process was successfully used to treat the major types of electroplating and etching wastes containing cd, cr, cu, ni, and zn. The economic aspects of treating concentrated electroplating, etching, and anodizing wastes are especially attractive because of the low cost of mixing two wastes, the high value of the recovered metals, and the simplicity of the recovery procedures. The filtrates from the waste-plus-waste step were relatively harmless compared with the original wastes and met public health service standards for free-cyanide content. Free-cyanide ions were not detected in most of the filtrates; the limit of detection was 0.03 Ppm. Small amounts of hcn were produced during the neutralization; the hcn was collected and neutralized.
OP; Journal Article
Issue of Publication
Plating and Surface Finishing
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division