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:
Jan. 20, 1981
Filed:
Jun. 28, 1979
Applicant:
Inventors:
Assignee:
Nippon Mining Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
423139 ;
Abstract
An acid solution containing cobalt and nickel is contacted with an organic extraction medium comprising alkyl phosphonic acid mono alkyl ester where said alkyl group has 8-10 carbon atoms in two or more stages, wherein the contact at a first stage is carried out at a pH value not exceeding 5.0 and at a second and further stages being carried out at a pH range of 5.5-7.0. Thereby cobalt may effectively and selectively be extracted into the organic extraction medium from the solution without excess rise in viscosity. Cobalt and nickel may be separately recovered with high purity.