Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1974-05-16
1976-01-20
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75109, 75115, 75117, 75120, 423 27, 423 41, 423 36, 423106, 423109, C22B 1508, C22B 1512, C22B 700, C22B 1922
Patent
active
039334783
ABSTRACT:
Process for receovering copper values (and zinc, if present) from copper bearing materials, optionally in admixture with iron. The feed material is leached with a mixture of nitric and sulphuric acids, after which the dissolved copper is cemented from solution by contact with iron. The solution, containing dissolved iron (and zinc, if present in the feed material) salts is reacted with ZnO to precipitate iron as ferric oxide, which is separated, leaving zinc sulfate in solution. Solid zinc sulfate is recovered from the solution by evaporation, and then calcined to produce SO.sub.2, which is recovered and recycled as H.sub.2 SO.sub.4, and ZnO, which is reused in the process, any excess being recovered as a product.
REFERENCES:
patent: 1674030 (1928-06-01), Allingham
patent: 3054736 (1962-09-01), Savage et al.
patent: 3510414 (1970-05-01), Orlandini et al.
patent: 3691038 (1972-09-01), von Roepenack et al.
patent: 3793429 (1974-02-01), Queneau et al.
patent: 3816105 (1974-06-01), McKay et al.
patent: 3832162 (1974-08-01), Smith
patent: 3849121 (1974-11-01), Burrows
Nicosep Associates
Ozaki G.
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