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. 26, 1993
Filed:
May. 20, 1992
Applicant:
Inventors:
Chandulal P Patel, West Vancouver, CA;
Alfred S Hayden, Richmond Hill, CA;
Assignee:
Prime Resources Group Inc., Vancouver, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75744 ;
Abstract
Refractory sulfidic silver ore which is not amenable to cyanide leaching is formed into an aqueous slurry and oxidized at elevated temperature, usually about 150.degree. to 250.degree. C., in the presence of an oxidizing agent, usually oxygen, and in the presence of about 30 to about 160 g/L zinc. Zinc present in the above range results in increased extractability of silver from the oxidized residue by cyanide leaching.