PROCEDURE FOR COMPLEX PROCESSING NICKEL-COBALT RAW MATERIAL Russian patent published in 2010 - IPC C22B23/00 C22B3/06 

FIELD: metallurgy.

SUBSTANCE: procedure consists in autoclave nitrogen-acid nickel leaching from cobalt and in extracting non-soluble iron-containing residue. Residue upon washing is withdrawn from the process in form of iron containing raw material. Residue is extracted from producing solution by neutralisation to pH=3.5-4.5 with magnesium containing reagent, whereupon residue is recycled for autoclave raw material leaching. Further there is performed sorption from neutralised producing solution in two successive stages. Nickel is adsorbed on the first stage, while cobalt - on the second. Produced raffinate containing magnesium nitrate is divided in two parts; one part is recycled to nitrogen-acid autoclave raw-material leaching, while the other part is subject to thermo-decomposition producing magnesium oxide, water phase and nitrogen oxides, which are combined with nitrogen oxides extracted at stage of autoclave leaching and converted into nitric acid. Produced nitric acid and water phase formed at thermo-decomposition of raffinate are directed to return, while magnesium oxide is directed to neutralisation as magnesium containing reagent and/or as a commodity product.

EFFECT: extended assortment of produced commodity and return products.

9 cl, 3 dwg, 1 tbl, 1 ex