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Recovery of Metals from Electroplating Wastes by the Waste-Plus-Waste Method.

PB194948

Publication Date	1970
Personal Author	George, L. C.; Cochran, A. A.
Page Count	13
Abstract	Addition of an acid waste to an alkaline cyanide waste was investigated for five different combinations of electroplating wastes. At the optimum final pH values of the mixtures, metals and cyanides were almost quantitatively precipitated. No evolution of hydrogen cyanide was detected. By a few additional processing steps, significant amounts of valuable metals were recovered for recycling. The waste-plus-waste step is attractive because no reagents are required, metals are concentrated, and a relatively harmless effluent that meets most water quality standards for cyanide content is produced. (Author)
Keywords	Electroplating Materials recovery Industrial wastes Water pollution Metals Silver Cobalt Copper Chromium Iron Nickel Nitrates Industrial waste treatment Cyanides pH Precipitation(Chemistry) Acidification Water pollution control Benzene sulfonic acid/nitro-(sodium-salt)
NTIS Subject Category	68D - Water Pollution & Control
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Report on Solid Waste Research Program.
Document Type	Technical Report
Title Note	Technical progress rept. no. 27.
NTIS Issue Number	197024

Recovery of Metals from Electroplating Wastes by the Waste-Plus-Waste Method.

Recovery of Metals from Electroplating Wastes by the Waste-Plus-Waste Method.
PB194948

Publication Date	1970
Personal Author	George, L. C.; Cochran, A. A.
Page Count	13
Abstract	Addition of an acid waste to an alkaline cyanide waste was investigated for five different combinations of electroplating wastes. At the optimum final pH values of the mixtures, metals and cyanides were almost quantitatively precipitated. No evolution of hydrogen cyanide was detected. By a few additional processing steps, significant amounts of valuable metals were recovered for recycling. The waste-plus-waste step is attractive because no reagents are required, metals are concentrated, and a relatively harmless effluent that meets most water quality standards for cyanide content is produced. (Author)
Keywords	Electroplating Materials recovery Industrial wastes Water pollution Metals Silver Cobalt Copper Chromium Iron Nickel Nitrates Industrial waste treatment Cyanides pH Precipitation(Chemistry) Acidification Water pollution control Benzene sulfonic acid/nitro-(sodium-salt)
NTIS Subject Category	68D - Water Pollution & Control
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Report on Solid Waste Research Program.
Document Type	Technical Report
Title Note	Technical progress rept. no. 27.
NTIS Issue Number	197024