The method of separation of zinc and nickel with the help of ionites is based on the different strength of complex ions of these metals in aqueous solution. Thus, at a chlorine ion concentration of 1.5-2.0 g-ion/l, zinc forms complex anions, while nickel remains in the form of cations. The different charge sign of nickel and zinc ions in chloride solution can be used for separation of these metals by absorption of nickel cations by cationites or complex zinc anions by anionites.In this work both variants were investigated. Weakly acidic KB-4-P2 in Na-form and strongly acidic KU-2 in H-form served as cationites, strongly basic AB-17 in chloride form served as anionites.

The advantage of ammonia leaching of cobalt-bearing ores after reduction roasting is the possibility of almost complete separation of iron. However, the concentration of cobalt in solution after ammonia leaching of poor ores is very low, which causes difficulties in their further processing.Precipitation of cobalt from ammonia solution in the form of sulfide. The solubility of cobalt sulfide in ammonia solutions is negligible, so when sulfides Na2S, (NH4)2S are introduced into solution, cobalt ammoniacates are destroyed and metal sulfide is precipitated.