Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1974-06-24
1976-08-17
Stern, Edward
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75119, 423561, 423562, 423565, 423659, C22B 2304, C01G 312
Patent
active
039751899
ABSTRACT:
A method for selectively recovering metals from generally sulphidic particulate materials containing metals selected from nickel, copper and precious metals in which the particulate material is preferentially leached in an agitated chloride solution containing cuprous ions by the action of chlorine. The redox potential of the solution increases upon feeding chlorine thereto and decreases upon feeding particulate material thereto, and the rate of feeding of chlorine is controlled relative to the rate of feeding of material to control the redox potential substantially at or below a selected potential at which the metal is leached preferentially with respect to other metals in the material. Nickel is leached preferentially with respect to copper and precious metals in a matte, for example, to produce a nickel-rich solution and to concentrate the precious metals in a nickel-depleted residue. The leach residue, or other concentrates containing copper and precious metals may also be treated by the method to selectively dissolve the copper values preferentially to the precious metal values. Dissolved copper in the nickel-bearing leach solutions may be precipitated in a separate tank by agitating the leach solution in the presence of elemental sulphur and nickel sulphide particles having an atomic ratio of nickel to sulphur greater than one, thereby producing copper sulphide and a substantially copper-free nickel-chloride solution which can be separated and the values recovered by conventional means.
REFERENCES:
patent: 940292 (1909-11-01), Wells
patent: 1671004 (1928-05-01), Baghdasarian
patent: 2352096 (1944-06-01), Hay
patent: 2693405 (1954-11-01), Mackiw et al.
patent: 3218161 (1965-11-01), Kunda et al.
patent: 3741752 (1973-06-01), Evans et al.
patent: 3880653 (1975-04-01), Hougen
Falconbridge Nickel Mines Limited
Hicks Richard J.
Stern Edward
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