C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 23/06 (2006.01) C22B 1/00 (2006.01) C22B 3/06 (2006.01)
Patent
CA 2650372
A process for smelting that can attain a high leaching ratio of nickel and cobalt and a high oxidation ratio of iron to trivalent iron, and, at the same time, can reduce energy cost by suppressing the amount of high-pressure air to be used as an oxidant and the amount of high-pressure steam to be used for maintaining temperature. In a smelting method comprising a first step for slurrying nickel oxide ore and a second step for adding sulfuric acid to the ore slurry and leaching the ore slurry while blowing high-pressure air and high-pressure steam therein, characterized by adjusting the carbon grade in a solid content of ore slurry so as to be 0.1 to 0.5% by mass depending on the blending ratio of the nickel oxide ore that constitutes the ore slurry in the first step and controlling oxidation-reduction potential (Ag/AgCl basis) of the leachate to 400 to 600 mV by adjusting the amount of the high-pressure air to be blown so as to be 700 to 800 Nm3 per ton of carbon in a solid content of ore slurry in the second step.
Nakai Osamu
Ozaki Yoshitomo
Shibayama Keisuke
Smart & Biggar
Sumitomo Metal Mining Co. Ltd.
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