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Development and Application of the Waste-plus-waste Process for Recovering Metals from Electroplating and Other Wastes.

Authors
Cochran-AA; George-LC
Source
NTIS: PB 233 487 :18 pages
Link
NIOSHTIC No.
10009239
Abstract
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 to almost completely precipitate the metals and cyanides. The metals were subsequently recovered by recycling; the cyanides can also be easily recycled. The process was successfully used to treat the major types of electroplating and etching wastes, containing cd, cr, cu, ni, and zn, and to treat both concentrated and dilute wastes. 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. Only small amounts of hcn were produced during the neutralization; the hcn was collected and neutralized.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-233487
NTIS Price
A03
Identifying No.
RI 7877
NIOSH Division
RORC;
Source Name
NTIS: PB 233 487
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