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:
Nov. 22, 2016
Filed:
Oct. 17, 2012
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Yoshitomo Ozaki, Niihama, JP;
Takayuki Nakai, Niihama, JP;
Shinichi Heguri, Niihama, JP;
Hideki Ohara, Niihama, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
Disclosed herein is a method for easily and efficiently removing manganese from an aqueous acidic solution of sulfuric acid containing cobalt and manganese at low cast to obtain a high-purity cobalt sulfate aqueous solution usable as a raw material for lithium ion secondary batteries. The high-purity cobalt sulfate aqueous solution is obtained by mixing an aqueous acidic solution of sulfuric acid containing cobalt and manganese (aqueous phase) with an acidic organic extractant (organic phase) while adjusting the pH of the aqueous acidic solution of sulfuric acid to a value in a range between 2 and 4 with a pH adjuster such as sodium hydroxide to extract manganese into the organic phase. The acidic organic extractant to be used is preferably diluted so that the concentration of di-2-ethylhexyl phosphate is 10 to 30 vol %.