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. 23, 1998
Filed:
Aug. 20, 1996
Applicant:
Inventors:
Michael J Collins, Fort Saskatchewan, CA;
Donald K Kofluk, Fort Saskatchewan, CA;
Assignee:
698638 Alberta Ltd., Fort Saskatchewan, CA;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B03D / ; C22B / ; C22B / ;
U.S. Cl.
CPC ...
423 26 ; 423 98 ; 423109 ; 205608 ;
Abstract
There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes may include those incorporating a single stage pressure leach, a process involving two stage countercurrent or cocurrent pressure leaches or a multistage leach process for recovering zinc, lead and silver from zinc bearing sulphidic materials which also contain lead and silver.