Iron chloride activated oxidation of sulfide ores

Details Iron chloride activated oxidation of sulfide ores Iron chloride activated oxidation of sulfide ores

1975-01-22

1976-09-21

Vertiz, Oscar R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 46, 423109, 423150, 423568, C01G 304, C01G 904, C01G 5108, C01G 5308

Patent

active

039819639

ABSTRACT:
A method is disclosed for oxidation of finely-divided sulphide ores or mattes containing iron, with one or more of the elements nickel, copper, cobalt, zinc and lead as constituents, in the presence of iron chloride in an oxygen-containing atmosphere at a temperature of 220.degree.-400.degree. C, to convert the mixture of iron chlorides and sulphides to water-insoluble iron oxide, the nickel, copper, cobalt and zinc being converted to water-soluble chlorides and sulphates, and the lead to a sulphate which may be leached away from the residual iron oxide by special solvents for lead sulphate. The initial iron chloride is preferably obtained by adding aqueous hydrochloric acid to the concentrate, if iron sulphide is present in a susceptible form, to drive off a portion of the sulphide sulphur as hydrogen sulphide gas, and to convert the corresponding iron sulphide to iron chloride. Temperatures may rise as high as 450.degree. C during the roasting phase if special conditions are observed while cooling.

REFERENCES:
patent: 1571502 (1926-02-01), Venn-Brown
patent: 1719534 (1929-07-01), Coolbaugh et al.
patent: 1822995 (1931-09-01), Meyer
patent: 1943335 (1934-01-01), Mitchell

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