Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1983-07-07
1985-08-20
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75114, 75120, 204118, 423109, C01G 305, C01G 904, C22B 1508, C22B 1512
Patent
active
045362149
ABSTRACT:
A process is described for recovering metal values from a zinc-containing complex sulphide material comprising leaching the material in a first leaching stage under non-oxidative conditions with a controlled amount of an aqueous chloride lixiviant solution containing cupric chloride in an amount which is selected so as to solubilize at least a part of the zinc in the material and to precipitate a quantity of cupric sulphide substantially equivalent on a molar basis to the zinc leached from the material, the lixiviant solution further containing sufficient of a source of chloride ions other than cupric chloride to ensure solubilization of metal chlorides present, recovering from the first leaching stage a zinc chloride-containing leach liquor, recovering metal values from said leach liquor in a metal recovery section, treating solids from the first leaching stage under oxidizing conditions in a second leaching stage with a liquor containing hydrochloric acid and metal chlorides thereby to solubilize further metal values from the solids, to precipitate iron values and to regenerate cupric chloride-containing lixiviant solution for use in the first leaching stage, and recovering from the second leaching stage (a) a solids residue consisting essentially of (i) iron values in the form of ferric hydroxide and jarosite and (ii) sulphur and that is substantially free from non-ferrous metal values and (b) a cupric chloride-containing lixiviant solution for recycle to the first leaching stage.
REFERENCES:
patent: 704639 (1902-07-01), Hoepfner
patent: 3776826 (1973-12-01), Atadan
patent: 4148698 (1979-04-01), Everett
patent: 4260588 (1981-04-01), Piret et al.
patent: 4288304 (1981-09-01), De Marthe et al.
patent: 4337128 (1982-06-01), Haakonsen
patent: 4378275 (1983-03-01), Adamson et al.
Chemistry, by John C. Bailar, Jr. et al., Academic Press, 1978, p. 543.
Fletcher Archibald W.
Naden David
Ochs Leonard R.
Weber Harald
Doll John
Duval Corporation
Russel Jeffrey E.
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