公开(公告)号：EP1252345A4

公开(公告)日：2005-07-13

申请号：EP00986860

申请日：2000-12-19

申请人： WMC RESOURCES LTD

发明人： O'CALLAGHAN JOHN ,  CHAMBERLAIN TONY

IPC分类号： C22B3/38 ,  C22B23/00 ,  C22B3/00 ,  C22B3/26

CPC分类号： C22B3/0066 ,  C22B23/043 ,  C22B23/0453 ,  C22B23/0484 ,  Y02P10/234

摘要： The present invention relates generally to a method of extracting cobalt and other impurity metals from a concentrated nickel sulphate solution by a solvent extraction process whereby a cationic solvent extractant is separately pre-equilibrated with a portion of a purified nickel sulphate solution in such a manner that it is loaded with nickel without precipitating insoluble nickel double salts. The nickel loaded extracted is then transferred to an impure cobalt nickel solution where the cobalt and certain other impurity metals exchange with nickel leaving a purified concentrated nickel sulphate solution suitable for hydrogen reduction or electrowinning. The cobalt loaded extractant is stripped with dilute sulphuric acid before being recycled whilst an aqueous cobalt stripped solution is further processed to recover cobalt.