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:
Mar. 30, 1982
Filed:
Oct. 27, 1980
William K Tolley, Salt Lake City, UT (US);
William C Laughlin, Schaumburg, IL (US);
UOP Inc., Des Plaines, IL (US);
Abstract
Desired metal values are recovered from metal-bearing sources by subjecting said metal-bearing sources to a reduction step which is effected in an aqueous solution of an ammoniacal ammonium salt containing a reducing reagent such as hydrazine, hydroxylamine hydrochloride, etc., or by treatment with carbon monoxide in the presence of a metal chelate such as that formed from cobalt sulfate and dimethyl glyoxime, and thereafter subjecting the reduced source to an oxidative leach by treatment wth an oxygen-containing gas such as air or oxygen. The reducing step is effected at ambient temperatures and pressures and the oxidative step is effected at ambient temperatures and pressures ranging from about 5 to about 500 psig. Desired metal values such as nickel and cobalt may be recovered in commercially attractive yields.