Sulfatization process for metal extraction from sulfide ores

Details Sulfatization process for metal extraction from sulfide ores Sulfatization process for metal extraction from sulfide ores

2005-01-25

2005-01-25

Andrews, Melvyn (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C075S711000, C075S743000, C423S041000, C423S052000, C423S106000, C423S146000, C423S517000, C423S544000, C423S557000, C423S558000

Reexamination Certificate

active

06846346

ABSTRACT:
The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at a temperature of between about 300° C. and 400° C. in the presence of oxygen to produce a solid metal sulfate product and a gaseous product which is primarily SO3, wherein said metal is selected from the group consisting of iron, copper, zinc, nickel, cobalt and manganese. Said metal sulfate product is then leached with dilute sulfuric acid to form a metal-containing solution, from which the metal values are separated by precipitation at raised H2SO4concentrations obtained by saturating the solution with the gaseous SO3from the sulfatization reaction step.

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patent: 4119698 (1978-10-01), Zimmer et al.
patent: 5484579 (1996-01-01), O'Brien
patent: 35116 (1973-05-01), None

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