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:
Jun. 04, 2013
Filed:
Aug. 16, 2011
Michael Massoud Hojjatie, Tucson, AZ (US);
Constance Lynn Frank Lockhart, Tucson, AZ (US);
Alexandros Dimitriadis, Phoenix, AZ (US);
Jeroen Van Cauwenbergh, Phoenix, AZ (US);
Roeland Van Dael, Tessenderlo, BE;
Michael Massoud Hojjatie, Tucson, AZ (US);
Constance Lynn Frank Lockhart, Tucson, AZ (US);
Alexandros Dimitriadis, Phoenix, AZ (US);
Jeroen Van Cauwenbergh, Phoenix, AZ (US);
Roeland Van Dael, Tessenderlo, BE;
Tessenderlo Kerley, Inc., Phoenix, AZ (US);
Abstract
An efficient process for the continuous preparation of calcium thiosulfate (CaSO) from lime sulfur, through oxidation is described. The process involves oxidizing calcium polysulfide intermediate in a series of reactors to produce calcium thiosulfate as a clear liquid in high concentration with minimal byproducts. The process results in the complete destruction of polythionates, permitting the calcium thiosulfate produced to be useful in certain leaching processes for precious metals. The invention further makes it possible to recycle the process water from the leaching process for use as a raw material reactant in the process for calcium thiosulfate production.