Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1975-05-23
1976-08-17
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75103, 75115, 75117, 75118R, 75119, 75 99, 75121, 423 27, 423 32, 423 41, 423146, 423150, C22B 1510, C22B 2304
Patent
active
039751902
ABSTRACT:
According to the process described, non-ferrous metal values, particularly nickel, copper and/or cobalt, are extracted from metallurgical intermediates, such as matte and speiss, by reacting the material under oxidizing conditions at a pH of about 4.5 to 6.5 with an ammonia free aqueous solution containing ammonium sulphate, sodium sulphate and/or nickel sulphate. The reaction-products of this operation are then mixed with sulphuric acid under ambient conditions to decrease the pH to about 3-4.5 and to dissolve the non-ferrous metals in the solution which is then separated from the undissolved residue. The process is particularly useful in treating intermediates containing precious metals in that the precious metals are substantially completely recovered in concentrated form in the undissolved residue.
REFERENCES:
patent: 3684489 (1972-08-01), Emicke et al.
patent: 3744994 (1973-07-01), Emicke et al.
patent: 3793432 (1974-02-01), Weston
patent: 3798304 (1974-03-01), Weston
patent: 3869360 (1975-03-01), Kane et al.
patent: 3909248 (1975-09-01), Ryan et al.
Kinjerski Theodore Andrew
Mackiw Vladimir N.
Van Der Meulen Sjaak Johan
Weizenbach Bauke
Delbridge Robert F.
Fors Arne I.
Ozaki G.
Piper Frank I.
Sherritt Gordon Mines Limited
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