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    SOLVENT EXTRACTION OF IMPURITY METALS FROM A VALUABLE METAL SULPHATE SOLUTION
    1.
    发明授权
    SOLVENT EXTRACTION OF IMPURITY METALS FROM A VALUABLE METAL SULPHATE SOLUTION 有权
    从珍贵金属的金属硫酸盐溶液污染的溶剂萃取

    公开(公告)号：EP1252345B1

    公开(公告)日：2008-06-11

    申请号：EP00986860.5

    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 ,  C22B3/26 ,  C22B23/00 ,  C22B3/00

    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.

    RECOVERY OF NICKEL AND COBALT FROM ORE
    3.
    发明公开
    RECOVERY OF NICKEL AND COBALT FROM ORE 有权
    提取镍和钴矿石材料

    公开(公告)号：EP1159461A1

    公开(公告)日：2001-12-05

    申请号：EP00913778.7

    申请日：2000-03-08

    申请人： BHP MINERALS INTERNATIONAL INC.

    发明人： DUYVESTEYN, Willem, P., C. ,  NEUDORF, David, A. ,  WEENINK, Erik, M. ,  HANSON, James, S.

    IPC分类号： C22B23/06 ,  C22B3/00

    CPC分类号： C22B3/42 ,  C22B3/0066 ,  C22B15/0093 ,  C22B23/043 ,  C22B23/0484 ,  C22B23/065 ,  Y02P10/234 ,  Y02P10/236

    摘要： A process is provided for the selective recovery from an impure solution of pure nickel and cobalt solutions, suitable for electrolysis of the respective metals. The impure solution may be that obtained from acid leaching of nickel/cobalt bearing laterite or oxide ore. The impure solution is contacted with a solid ion exchange resin to selectively extract nickel and cobalt, while rejecting at least one element of the group manganese, magnesium, calcium, iron(II), and chromium(III). The ion exchange resin contains bis-picolyl amine as the primary chelating group. The impure solution has sufficiently low levels of chromium(VI) and copper to allow repeated use of the ion exchange resin. The metal-bearing resin is washed and then stripped with an acid solution. This solution is then contacted with a water-immiscible organic phase for the selective extraction of cobalt, leaving nickel in the raffinate as a substantially pure nickel solution. The loated organic phase is stripped with another acid solution to produce a substantially pure cobalt solution. The extractant contains an organic phosphinic acid as the active group for extraction. Nickel and cobalt can be recovered in essentially pure form from the respective pure nickel and cobalt solutions by a variety of conventional techniques, for example by electrowinning.

    VERFAHREN ZUR TRENNUNG VON DREIWERTIGEM AMERICIUM VON DREIWERTIGEM CURIUM
    7.
    发明授权
    VERFAHREN ZUR TRENNUNG VON DREIWERTIGEM AMERICIUM VON DREIWERTIGEM CURIUM 有权
    方法三价镅锔价的分离

    公开(公告)号：EP1664359B1

    公开(公告)日：2007-01-03

    申请号：EP04762663.5

    申请日：2004-08-14

    申请人： Forschungszentrum Jülich GmbH

    发明人： MODOLO, Giuseppe ,  ODOJ, Reinhard

    IPC分类号： C22B60/02 ,  C22B3/00 ,  C22B59/00 ,  C07F9/16 ,  G21F9/12

    CPC分类号： G21F9/125 ,  C22B3/0066 ,  C22B3/007 ,  C22B60/0295 ,  Y02P10/234

    摘要： The invention relates to a method for separating trivalent americium from trivalent curium. According to the inventive method, an aqueous solution containing at least said cations is contacted, at an acid concentration of 0.01 mol/L to 1 mol/L, with an organic solvent containing a bis(aryl)dithiophosphinic acid of general formula (4), wherein R1 = phenyl- or naphthyl, R2 = phenyl- or naphthyl, with methyl-, ethyl-, propyl-, isopropyl-, cyano-, nitro-, halogenyl- (Cl-, F-, Br-, J-) substituted radicals of R1 and R2, R1 and R2 being optionally substituted by at least one component from the group comprising methyl-, ethyl-, propyl-, isopropyl-, cyano-, nitro-, halogenyl- (Cl-, F-, Br-, J-), and with a synergist of general formula (5), wherein X and/or Y and/or Z = RO (=alkoxy) or R (=alkyl), R being optionally branched and/or unbranched. The separation factor for americium (III) and curium (III) has an order of magnitude of 10.