Nickel sulfide benefication process

Details Nickel sulfide benefication process Nickel sulfide benefication process

C - Chemistry, Metallurgy

22

B

53/299

C22B 23/02 (2006.01)

Patent

CA 1095260

ABSTRACT OF THE DISCLOSURE A process for recovering nickel concentrates from nickel containing sulfide ores, nickeliferous pyrrhotites or, for example, mixtures of pentlandite and pyrrhotite, wherein the process feed, either an initial ore or concentrate, is upgraded by segregation roasting in an autogenous atmosphere at temperatures within the range of 1550°F to 1850°F, the process feed being mixed with one of the chloridizing compound additives CaO + NaCl, CaCo3 + NaCl, or Ca(OH)2 + NaCl, and a carbonaceous reductant such as coke or coal. The resulting calcine is beneficiated by conventional methods and a concentrate of substantially higher nickel content than the starting material is obtained at a very high rate of recovery.

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