title: Treatment of alloy-electroplating wastewater by an automated solvent extraction technique.
abstract: 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.
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Kowloon.
authors.forename: Y K
authors.initials: YK
authors.lastname: Sze
authors.forename: L Z
authors.initials: LZ
authors.lastname: Xue
authors.forename: M Y
authors.initials: MY
authors.lastname: Lee
mesh_terms: 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*
chemical_list: D012997:Solvents; D003035:Cobalt; D015032:Zinc