C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/298
C22B 23/00 (2006.01) B03B 9/00 (2006.01) B03C 1/015 (2006.01) C22B 5/10 (2006.01) C22B 23/02 (2006.01)
Patent
CA 1076368
ABSTRACT OF THE DISCLOSURE The present invention provides a process of upgrading the nickel from nickel lateritic iron ore with iron content over 10%, silica content over 25% and nickel content of at least 0.5% which process comprises thoroughly mixing the ground ore with calcium carbonate, calcium sulphate and coke, spraying the mixture with a solution of sodium chloride, drying the mixture, heating the mixture at a temperature not exceeding 1050° C, for a period of time up to 90 minutes, roasting the mixture at the above temperature for a sufficient period of time to convert all nickel in the ore to metallic state in a neutral or even slightly reducing atmosphere, grinding the roasted mixture in an aqueous medium, and adjusting the density of the pulp obtained for a subsequent flotation or by magnetic separation process to produce a concentrate.
249487
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