COPPER-CONTAINING WASTE PROCESSING METHOD Russian patent published in 2004 - IPC

FIELD: nonferrous metallurgy. SUBSTANCE: invention provides method for integrated processing of copper-containing waste to give a series of commercial products. Method comprises treatment of initial raw material with sulfuric acid in presence of nitric acid in cementation of copper metal from solution to give initial raw material. According to invention, 15-25% sulfuric acid and 30-45% nitric acid are used at their ratio (8-12):1 at 85-95 C. Acids are added at least once when initial raw material is loaded, resulting solution is aged until gas formation ceased, and 0.5% solution of polyacrylamide is added at stirring, after which solution is further aged for 5-6 h to give suspension, which is then liberated from precipitate and resulting solution is subjected to electrochemical extraction of copper at anodic density no higher than 450 A/sq.m and temperature 30-60 C until concentration of copper in solution is below 5 g/l. Worked-out electrolyte is passed through initial raw material, while retaining it to achieve concentration of copper in solution below 5 mg/l and concentration of residual free sulfuric acid 0.020-0.005%. Copperdepleted solution is further passed through aminocarboxylic groups-containing ion-exchange resin at 18 to 75 C. EFFECT: increased completeness of processing of anode precipitate obtained as high-purity aluminum production waste. 2 ex