FIELD: metallurgy.
SUBSTANCE: method includes two-phase solution neutralisation by calcium-bearing material. Before two-phase neutralisation by calcium-bearing material nickel-bearing solution is neutralised by nickel-bearing sludge of galvanic industry till achieving of solution pH 1.0-2.5. Received solution is subject to neutralisation by calcium-bearing material: at the first stage till pH=5.0-6.0, at the second stage - with usage in the capacity of calcium-bearing material of lime milk till pH=8.5-9.5 with receiving of rich nickel concentrate.
EFFECT: quantity increasing of nickel in resulting product.
1 tbl, 2 ex
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