| Weathered crust rare earth ore has been discovered in the south of Jiangxi as early as1970, Medium and heavy rare earth elements, especially Yttrium, exit at extremely high levels in that mine. At present, it is the only resource of medium and heavy rare earth. Nowadays, the production crafts of rare earths of this mine mainly adopt precipitation to remove impurities, acid soluble, and prepare individual rare earth elements by using traditional acidic extractants. However, some disadvantages, lower selectivity、heavy acid and alkali consumption、difficultly reverse extraction et. al., were found on the traditional extraction agents (such as P204and P507). So some researchers try their best to find new extraction agent with higher selectivity for replacing traditional extraction agents.In this thesis, Bifunctional ionic liquid extractant (bif-ILE)[A336][P204]/[A336][P507] were firstly used on extracting rare earth elements from the exchanged liquor of weathered crust elution-deposited rare earth ore, according to the character of the exchanged liquor of weathered crust elution-deposited rare earth ore. The various factors effecting on distribution ratio were systematically studied in the exchanged liquor of rare earth ores, those factors are mainly extractant concentration, salting out agent, pH, and temperature. The research results show that Al3+can be firstly stripped from organic phase of extraction system by using HC1as reverse extraction acid, we achieved separation Al3+from rare earth elements; preliminary grouping rare earth was accomplished using (bif-ILE)[A336][P507] as extractant dealing with exchanged liquor of weathered crust elution-deposited rare earth ore under the condition of [A336][P507]=0.12mol/L and secondary counter-current extraction.All experiment results have provided theoretical basis for applying ionic liquid on exchanged liquor of rare earth ores, and provide a solid underpinning for disposing of the exchanged liquor of rare earth ores. |
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