RARE METAL WATER-BASED FRACTIONAL PRECIPITATION METHOD UTILIZING POLYMER COORDINATION

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PROBLEM TO BE SOLVED : To provide a method in which a rare metal, such as indium and rare earth, that is difficult to separate, can be selectively separated at low cost, and especially to provide a method in which, from an aqueous solution containing neodymium ion and dysprosium ion, dysprosium ion can selectively and at low cost be separated. SOLUTION : Provided is a method for separating rare metal by water-based fractional precipitation in which a water-soluble phosphoric acid diester, such as dibutyl phosphate ester and hydrogen phosphate=bis[2- (methacryloyloxy)ethyl], is used as a coordinated polymer forming agent, and in which, in an aqueous solution containing an ion of rare metal, the ion is selectively brought into polymer coordination, and thus into fractional precipitation. COPYRIGHT : (C)2015, JPO&INPIT