EXTRACTION METHOD OF NICKEL AND COBALT FROM WASTE CONVERTOR SLAGS OF NICKEL MANUFACTURING PLANT Russian patent published in 2013 - IPC C22B23/02 C22B7/04 

FIELD: metallurgy.

SUBSTANCE: method involves chemical heat treatment of slags containing 0.4-1% of nickel and 0.2-0.9% of cobalt in the form of oxides and 2-10% of sulphur. Processing is performed in a mixture with steel low-carbon chips obtained after the turning process and ammonium chloride or chlorides of alkali metals or their mixture at the temperature of 1050-1100°C for formation of gaseous nickel and cobalt chlorides and performance of an exchange reaction. As a result of the reaction, nickel and cobalt are deposited from gaseous phase, diffuse inwardly and dope low-carbon steel chips that are further remolten in induction furnaces so that an alloy containing 0.9-1.7% of nickel and 0.3-0.8% of cobalt, and iron that is the rest, is obtained. As a result, an alloy is obtained, the sulphur content of which does not exceed it content in initial metal of low-carbon steel chips.

EFFECT: simplifying an extraction process of nickel and cobalt from poor waste slags.

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