SORPTIONAL RECOVERY OF COPPER FROM SOLUTIONS PRODUCED BY HYDROCHLORIC ACID DECOMPOSITION OF COBALT-CONTAINING CAKES

摘要

Under traditional joint processing of hard alloy wastes, and tungsten alloys containing nickel, iron and copper (VNZh, VNM, contact alloys, etc.) - including alloying with saltpeter and aqueous leaching of the melt [1] - residues of oxides of cobalt, titanium, iron, nickel, copper, etc.remain in the bottom phase: a cobalt cake. Decomposing cobalt cakes in hydrochloric acid - apart from end components passing into the solution - there are also iron, nickel, and copper impurities. In order to recover cobalt during hard alloy production, solutions have to be thoroughly purified from the above-indicated impurities during hydrometallurgical processing; in particular, the copper content in the cobalt should not exceed 0.4 percent. Since hydrolytic purification of solutions from copper to that kind of residual content brings high cobalt losses with hydrate cake, and impoverishment of the latter is complex, we examined look the possibility of purifying solutions by selective sorption of copper. Tests were made on technological solutions obtained by hydrochloric acid decomposition of cobalt cakes followed by hydrolytic purification from iron containing (in g/l): 40-50 Co, 3.0-4.5 Ni, 0.20-1.5 Cu, <0.01 Fe, and about 5 g-equiv/lit Cl~-. In order to determine the sorbent with the greatest capacity and selectivity when recovering copper from such solutions, a variety of ionites were tested: sulfocationite KU-2 8n and its modification -sulfoamine ampholite KU-2-8A; phosphate cationite KDMF and a phosphorus-containing ampholite ANKF-1; carboxyl cationites SG-1M and KMD, amine-carboxylic resins VP-14KM, and ANKB-35 [2, 3] in H~+ and H~+Cl~- forms.