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:
Feb. 24, 1987
Filed:
Jul. 05, 1985
Applicant:
Inventors:
Derek J Fray, Trumpington, GB;
Herbert A Hancock, Dartmouth, CA;
Assignee:
National Research Development Corporation, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
423 49 ; 423D / ; 423544 ; 423605 ; 75-2 ; 7510 / ; 75121 ; 75114 ; 75115 ;
Abstract
This method of obtaining an aqueous solution of metal values from an insoluble metal oxide is possible where the metal has a lower oxidation number in the solution than in the insoluble oxide, for example manganese (+2 and +4 respectively). The oxide, such as MnO.sub.2, is treated with hot mineral acid such as HCl in the presence of coal. After some hours, the liquid comes to contain most of the manganese as dissolved Mn(II) ion.