FIELD: metallurgy.
SUBSTANCE: procedure consists in leaching with solution of sulphuric acid and in receiving productive solution. Productive solutions are received by heap or underground leaching with solution of sulphuric acid. During process periods of ore leaching and concentration are alternated, while concentration of sulphuric acid in leaching solution is maintained under a differential mode with change of higher concentration of 50-250 g/l in a period of ore leaching to a lowered one - 1-10 g/l in periods of mode of ore buddling. Further, impurities of iron, aluminium, magnesium and silicon are removed from productive solutions; nickel is extracted into concentrate and re-circulated solutions are returned to leaching after strengthening with sulphuric acids.
EFFECT: reduced specific consumption of sulphuric acid for specified extraction of nickel.
3 cl, 2 tbl, 6 ex
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