Treatment of alloy-electroplating wastewater by an automated solvent extraction technique.
Electroplating with highly toxic metals is being gradually replaced by alloy or mixed-metal electroplating. We developed a solvent extraction method for the treatment of waste rinsewater generated in Zn-Co alloy electroplating, based on the studies of the extraction properties. An alkyl ester of an alkylphosphonic acid (PC-88A) or a dialky phosphinic acid (Cyanex 272) was used as the extractant. The two metals were co-extracted into the organic solvent and then separately recovered in a simple process. The feasibility of the process was demonstrated with automated mixer-settler solvent extraction units.
Sze
Y K
YK
Department of Biology and Chemistry, City University of Hong Kong, Kowloon.
Xue
L Z
LZ
Lee
M Y
MY
D001331:Automation; D003035:Cobalt / Q000737:chemistry*; D004595:Electroplating; D012997:Solvents / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014876:Water Pollution / Q000517:prevention & control; D015032:Zinc / Q000737:chemistry*
D012997:Solvents; D003035:Cobalt; D015032:Zinc