Acid pressure leaching a pentlandite-chalcopyrite-pyrrhotite concentrate / J.A. Vezina, Extraction Metallurgy Division. : M34-20/129E-PDF

“Test work was carried out to determine the feasibility of treating a pentlandite-chalcopyrite-pyrrhotite concentrate by pressure oxidation for the extraction of nickel, copper, and cobalt. Conditions for a practical method of extraction were determined which resulted in >98 per cent extractions of the nickel and cobalt and >90 per cent of the copper as sulphated in aqueous pulp of pH about 1.4. These conditions were that the concentrate was ground to 100 per cent minus 325 mesh and pulped with water or acidified water to contain 30 per cent solids; the pulp was then subjected to a 400-psig pressure with oxygen at 230°F for 14 hours. An aqueous pulp having these characteristics and containing a substantial quantity of ferric iron could be treated directly by a solvent-in-pulp technique for the recovery of the copper. Subsequently, the copper-free pulp could be treated for the removal of the iron by increasing the pH to about 2 with calcium carbonate. After removing the precipitated solids by filtration, the resulting solution could then be processed for the recovery of the cobalt and nickel by using a liquid-liquid extraction method. The cost of the reagents to dissolve >98 per cent of the nickel and cobalt and >90 per cent of the copper originally contained in the concentrate was estimated at about $10.00 per ton of concentrate"--Summary, p. i.

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