Process for non-ferrous metals production from complex sulphide

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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75 2, 75109, 75114, 75115, 75117, 75118R, 75120, 423 36, 423 41, 423100, 204119, C22B 1922, C22B 1508, C22B 1104, C22B 1304

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042669723

ABSTRACT:
Metal sulphide ore is leached by water under a low pressure and oxidizing atmosphere to dissolve zinc and copper, hydrolyze iron to hematite, and leave lead and precious metals as insoluble sulphates. The residue is leached by sodium chloride and calcium chloride to dissolve lead and the precious metals.

REFERENCES:
patent: 3923976 (1975-12-01), Vega et al.
patent: 3957602 (1976-05-01), Johnson et al.
patent: 3961941 (1976-06-01), Baker et al.
patent: 4011146 (1977-03-01), Coltrinari et al.
patent: 4063933 (1977-12-01), Peters
patent: 4113471 (1978-09-01), Langhorst et al.

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