Process for the recovery of elemental sulphur from residues...

Details Process for the recovery of elemental sulphur from residues... Process for the recovery of elemental sulphur from residues...

2007-05-22

2009-10-20

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

C423S431000, C423S438000, C423S562000, C423S566200, C423S571000, C423S637000

Reexamination Certificate

active

07604785

ABSTRACT:
The present invention relates to a process for the recovery of elemental sulphur from residues produced in hydrometallurgical processes based on leaching with a solution of sodium sulphide in which the sulphur contained in the residues is selectively leached as sodium polysulphide. The sulphur leaching solution is conveniently regenerated and recycled to the process.

REFERENCES:
patent: 2329816 (1943-09-01), Betterton et al.
patent: 3933475 (1976-01-01), Swanson
patent: 4138248 (1979-02-01), Narain
patent: 5630931 (1997-05-01), Manequini
patent: 6696037 (2004-02-01), Watanabe et al.
patent: 1806086 (1993-03-01), None
European Search Report, Sep. 6, 2007.

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