The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 2009
Filed:
May. 22, 2007
Process for the recovery of elemental sulphur from residues produced in hydrometallurgical processes
Applicants:
Marco Olper, Monza Milan, IT;
Massimo Maccagni, Sesto San Giovanni Milan, IT;
Silvano Cossali, Ponte Nossa Bergamo, IT;
Inventors:
Marco Olper, Monza Milan, IT;
Massimo Maccagni, Sesto San Giovanni Milan, IT;
Silvano Cossali, Ponte Nossa Bergamo, IT;
Assignee:
Engitec Technologies S.p.A., Milan, IT;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C01B 17/02 (2006.01); C01B 17/06 (2006.01);
U.S. Cl.
CPC ...
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.