Process for leaching zinc from partially desulfurized zinc conce

Details Process for leaching zinc from partially desulfurized zinc conce Process for leaching zinc from partially desulfurized zinc conce

1987-03-26

1988-10-18

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 2, 75 9, 75101R, 75101BE, 75108, 75121, 423100, 423101, 423109, 423110, 423139, 423140, 423150, 423153, 204112, 204118, C22B 1900

Patent

active

047785209

ABSTRACT:
A process comprises leaching zinc oxide either separately or in conjunction with iron oxides from a partially desulfurized zinc bearing sulfide ore of concentrate. The ore is pretreated to eliminate in a controlled manner sulfur-sulfur-sulfide in the ore yet leaving sufficient residual sulfur-sulfide in the material such that iron values are maintained substantially wholly in the ferrous state, while converting zinc sulfide to zinc oxide without formation of FeO-ZnO complexes. The partially desulfurized material may be selectively leached with a sulfuric acid containing solution under neutral leach conditions to dissolve thereby preferentially the zinc oxide over the iron oxide. Alternatively the material may be leached with a higher concentration of sulfuric acid containing solution to dissolve preferentially zinc oxide and iron oxide simultaneously. The leach liquor may be subsequently treated to electrolytically remove zinc.

REFERENCES:
patent: 4124462 (1978-11-01), Reinhardt et al.
patent: 4552629 (1985-11-01), Duyoesteyn et al.

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