Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1985-02-11
1986-04-29
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75 2, 75 72, 75 74, 75 82, 75 83, 75101R, 75115, 75119, 75121, 423 27, 423 35, 423 36, 423 41, 423 42, 423 45, 423140, 423146, 423150, 423152, 423154, 204108, C22B 1500, C22B 2300
Patent
active
045854777
ABSTRACT:
A method of recovering copper and nickel from sulphidic minerals containing copper, nickel and iron comprises the steps of roasting the mineral, preferably to provide magnetite; sulphating, for example with sulphuric acid, sulphur trioxide, metal sulphate and/or sulphur dioxide together with oxygen; and a subsequent leaching of the sulphated material and recovery of copper from the leaching solution, for example by electrolysis. All or part of the leaching solution with its nickel content is recycled to the roasting stage, and the nickel content is removed in the form of nickel oxide together with the leaching residue, from which nickel can be recovered.
REFERENCES:
patent: 1315761 (1919-09-01), Coolbaugh
patent: 1528209 (1925-03-01), Greenawalt
patent: 1844937 (1932-02-01), Hybinette
patent: 4069041 (1978-01-01), Gorling et al.
patent: 4093526 (1978-06-01), Blanco et al.
Hauf, N. W. and Schmidt C. G., "The Roasting and Leaching of Witwatersaand Pyrite Concentrates" J. of S. Africa Inst. of Mining and Metallurgy Aug., 1979, pp. 365-371.
Boliden Aktiebolag
Doll John
Ljungman Nils H.
Stoll Robert L.
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