C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/266
C01G 9/02 (2006.01) C22B 3/08 (2006.01) C22B 19/34 (2006.01)
Patent
CA 1313023
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.
566537
Nguyen Kim D.
Robinson Murry C.
Spink Donald R.
Bereskin & Parr
Materials-Concepts-Research Limited
Nguyen Kim D.
Robinson Murry C.
Spink Donald R.
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