METHOD OF PROCESSING COPPER-NICKEL SULPHATE SOLUTION Russian patent published in 2012 - IPC C22B23/00 C22B15/00 C22B3/44 

FIELD: process engineering.

SUBSTANCE: invention relates to hydrometallurgy of copper and nickel and may be used for processing sulphate solutions of copper and nickel. Proposed method comprises nickel sulphate crystallisation. Note here that, prior to crystallisation, solution is processed by ammonia water to pH of 4-4.5 at not over 60°C. Nickel sulphate double salt is subjected to isohydric crystallisation with reaction volume cooling to 15-25°C and separation of crystallised double salt from amorphous phase of appropriate component and mother solution. Said separation is carried out in upflow at variable hydrodynamic conditions created by mother solution at its linear rate of 6-8 m/h.

EFFECT: simplified process, decrease fire hazard.

2 cl, 1 tbl, 4 ex