Process for treating zinc oxide bearing materials

Details Process for treating zinc oxide bearing materials Process for treating zinc oxide bearing materials

1988-05-11

1991-05-21

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

423106, 423109, 75724, 75726, 75743, C22B 1900, C22B 300, C01G 900

Patent

active

050173464

ABSTRACT:
A process of refining zinc oxide from roasted zinc sulphide bearing concentrates comprises leaching the concentrate in an aqueous sulphur dioxide solution under controlled conditions providing selective separation of zinc from other elements contained in the concentrate. The zinc bisulphite solution so obtained is separated from the remaining solids and is heat treated, preferably with steam, to precipitate zinc monosulphite crystals, possibly after first adding zinc dust to the solution to cement out residual copper and cadmium. The zinc monosulphite is then separated from the solution, possibly washed with water, and calcined to yield purified zinc oxide.

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patent: 4610721 (1986-09-01), Duyvesteyn et al.
patent: 4637832 (1987-01-01), Cammi et al.

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