公开(公告)号：EP2492364A4

公开(公告)日：2015-10-21

申请号：EP10824776

申请日：2010-10-01

申请人： SUMITOMO METAL MINING CO

发明人： NAKAI OSAMU ,  KITAZAKI TORU ,  HEGURI SHINICHI ,  OZAKI YOSHITOMO ,  SHIBAYAMA KEISUKE

IPC分类号： C22B23/00 ,  C22B3/00 ,  C22B3/02 ,  C22B3/44

CPC分类号： C22B23/04 ,  C22B3/02 ,  C22B23/0407 ,  Y02P10/234

公开(公告)号：EP2772557A4

公开(公告)日：2015-06-24

申请号：EP12844253

申请日：2012-10-17

申请人： SUMITOMO METAL MINING CO

发明人： OZAKI YOSHITOMO ,  NAKAI TAKAYUKI ,  HEGURI SHINICHI ,  OHARA HIDEKI

IPC分类号： C22B23/00 ,  C22B3/20 ,  C22B3/26 ,  C22B7/00 ,  H01M10/54

CPC分类号： C22B23/0461 ,  C01G51/10 ,  C01P2006/80 ,  C22B3/0005 ,  C22B7/007 ,  H01M4/505 ,  H01M4/525 ,  H01M10/052 ,  H01M10/54 ,  Y02E60/122 ,  Y02P10/234 ,  Y02P70/54 ,  Y02W30/84

摘要： 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 vole.