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Recovery of Metallurgical Values from Industrial Wastes.
Barnard PG; Cochran AA; George LC
Proc 2D Min Waste Util Symp Spons by USBoM & IIT Res Inst Chicago 3/18-19/70 :7-14
Various industrial problems encountered in research on materials recycling are described. Some were solved by simple methods that promised quick economic return. Lack of laboratory facilities is often a deterrent to industrial problem solving. A novel method is presented for recycling the components of scrap cemented carbides by soaking them in molten zinc and then extracting the zinc by vacuum distillation. Results of investigation of two processes for recovery of metals from electroplating wastes are discussed. One leads to the selective recovery of high-purity nickel sulfate and copper from a waste nitric acid rack-stripping soluction by controlled-potential electrolysis and selective precipitation with ph control. In the other, organic-cyanide stripping waste is treated with the nitric acid stripping waste, precipitating nickel, copper, and cyanides. Subsequently, copper is recovered by electrolysis, and nickel sulfate solution is sufficiently purified to recycle in a plating bath.
Proc. 2D Min. Waste Util. Symp, Spons. by USBoM & IIT Res. Inst. Chicago, 3/18-19/70, PP. 7-14
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