C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/304
C22B 23/00 (2006.01) B01D 11/00 (2006.01) B01F 1/00 (2006.01) C01G 53/10 (2006.01) C22B 3/00 (2006.01)
Patent
CA 1171287
ABSTRACT OF THE DISCLOSURE Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt there- from. However, in order to obtain good extraction from these ores, prolonged treatment using acid of high strength and also using high pressures and recylcing steps have been necessary. In the improves method of the invention nickel and cobalt is solubilized from high-magnesia nickeliferous serpentine ores by leaching the ore with an aqueous solution of sulphuric acid while adding to the solution a reducing agent to maintain the redox potential of the solution at a value between 200 and 400 milivolts, measured against the saturated calomel electrode. This improved procedure increases the reactivity of the serpentine and results in maximum extraction of nickel consistent with minimum extrac- tion of iron and magnesia and minimum acid consumption.
387809
Dunn Ronald R.
Hatch William R.
Falconbridge Limited
Ridout & Maybee Llp
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