FIELD: non-ferrous metallurgy; pressure hydrometallurgy and processing of oxidized silicate nickel ores enriched with magnesium.
SUBSTANCE: proposed method includes sulfidizing stage and oxidizing stage with the use of elemental sulfur at the sulfidizing stage in form of aqueous suspension and oxygen at the oxidizing stage. At the sulfidizing stage, use is made of solution of sulfates with bivalent cation and surfactant which facilitates hydrophilization of elemental sulfur; surfactant is fed to suspension at grinding the sulfur which makes it possible to perform both stages of pressure leaching at temperature below 200°C and total pressure in autoclave below 2.0 Mpa, thus ensuring high extraction of nickel into solution up to 93-97%.
EFFECT: considerable reduction of pressure leaching temperature and total pressure in autoclave at high extraction of nickel into solution.
2 cl, 4 ex
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