Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1981-10-16
1983-10-18
Meros, Edward J.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423146, 423155, 75119, C22B 2304, C01G 5310
Patent
active
044104987
ABSTRACT:
Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt therefrom. However, in order to obtain good extraction from these ores, prolonged treatment using acid of high strength and also using high pressures and recycling steps have been necessary. In the improved 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 millivolts, 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 extraction of iron and magnesia and minimum acid consumption.
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Dunn Ronald R.
Hatch William R.
Falconbridge Nickel Mines Limited
Meros Edward J.
Stoll Robert L.
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