Process for the treatment of a raw material which contains oxide

Details Process for the treatment of a raw material which contains oxide Process for the treatment of a raw material which contains oxide

1981-09-29

1982-10-19

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423109, 423146, 423150, 423633, 75115, C22B 1900, C01G 4906

Patent

active

043550053

ABSTRACT:
A process for the treatment of a raw material which contains oxides and ferrites of zinc, copper and cadmium is disclosed, in which the raw material is neutral leached with a sulfuric-acid-bearing solution in order to leach the oxide without substantial dissolving of ferrite, the ferrite-bearing residue is separated, and a sulfuric-acid-bearing or ferrisulfate-bearing solution is mixed with the residue in order to leach the ferrite and to precipitate the iron as jarosite in the presence of alkali ions or ammonium ions under atmospheric conditions at 80.degree.-105.degree. C., the sulfuric-acid-bearing or ferrisulfate-bearing solution being added to the ferrite-bearing residue in such an amount that approximately 50-60% of the ferrite dissolves and its iron precipitates as jarosite, the solid phase is dried and heated to so high a temperature that the zinc of the solid phase is converted to zinc sulfate and its iron to hematite according to the following reaction:

REFERENCES:
patent: 1834960 (1931-12-01), Mitchell
patent: 3910784 (1975-10-01), Rastas
patent: 3959437 (1976-05-01), Rastas
patent: 3985857 (1976-10-01), Menendez
patent: 4129454 (1978-12-01), Pavonet
patent: 4219354 (1980-08-01), Rastas
Rastas et al., "Treatment of Residues in the Electrolytic Zinc Process", TMS Paper No. A73-11, (2/73), AIME, N.Y.
Lead and Zinc, vol. II, pp. 217-219, (AIME Word Symposium), AIME, N.Y., (1970).

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