METHOD FOR EXTRACTION OF NICKEL AND CADMIUM FROM USED ALKALI ACCUMULATORS AND BATTERIES Russian patent published in 2014 - IPC C22B7/00 C22B17/00 C22B23/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to an area of secondary production of non-ferrous metals. An extraction method of cadmium and nickel from used alkali accumulators and batteries involves chemical treatment of waste alkali accumulators and batteries with ammonium chloride by passing through them of condensed vapours of heated solution of ammonium in water with dilution of cadmium and nickel oxides and formation of solutions of cadmium and nickel ammoniates, extraction of solutions of cadmium and nickel ammoniates and their heating with decomposition into cadmium and nickel hydroxides, deposition of cadmium and nickel hydroxides and separation of the obtained deposit from the solution, heating of the solution till evaporation, its condensation and passing of the obtained condensate through the rest mass. The solution separated from the deposit at chemical treatment is tested for cadmium and/or nickel ammoniates available in it by trial action on it with sodium or potassium sulphides, and the above test is repeated till there are no cadmium and/or nickel ammoniates in the solution.

EFFECT: invention provides effective extraction of cadmium and nickel hydroxides from used accumulators and batteries, as well as it allows improving environmental safety of the process.

5 cl, 2 ex