公开(公告)号：US20210039011A1

公开(公告)日：2021-02-11

申请号：US16979607

申请日：2018-11-21

申请人： SUMITOMO METAL MINING CO., LTD.

发明人： Hideki OHARA ,  Satoshi ASANO ,  Hiroshi KOBAYASHI ,  Masatoshi TAKANO ,  Shota SANJO

IPC分类号： B01D11/04 ,  C22B26/22

摘要： Provided is a solvent extraction method that allows selectively separating magnesium from an acidic aqueous solution of sulfuric acid. The solvent extraction method includes: bringing an acidic aqueous solution of sulfuric acid containing nickel, cobalt, and magnesium in contact with an organic solvent to extract the magnesium into the organic solvent; and using the organic solvent produced by diluting an extractant made of alkylphosphonic acid ester with a diluent. A concentration of the extractant is set to 40 volume % or more and 60 volume % or less and a pH of the acidic aqueous solution of sulfuric acid is set to 1.5 or more and 2.0 or less, or the concentration of the extractant is set to 20 volume % or more and 50 volume % or less and the pH of the acidic aqueous solution of sulfuric acid is set to 2.0 or more and 2.5 or less.