Research Progress on Formation and Removal of Impurity in Leaching Process of Ion-Adsorbed Rare Earth Ore
Ion adsorbed rare earth ore is an important source of medium and heavy rare earth.The presence of impurities such as aluminum and iron significantly affect the subsequent extraction and separation of rare earth in the in-situ leaching process.Therefore,the research of impurity components in the in-situ leaching process of ion adsorbed rare earth ore is great theoretical and practical significance.Firstly,the research progresses of the formation mechanism of impurity components in the leaching process of ion adsorbed rare earth ore was reviewed,and the influence of the existence of impurity components on the subsequent process and rare earth product quality was summarized.According to the formation mechanism of impurity compo-nents,the research progress of impurity removal in leaching process and mother liquor is introduced respectively.The theoreti-cal basis,advantages and disadvantages of different impurity removal methods are emphatically expounded.According to the ex-isting research basis and national policies,it is proposed that the harmless and efficient should attract enough attention in the future during impurities removal of ion adsorbed rare earth ore,and focus on the basic research on the formation mechanism of impurity components,to develop green and efficient leaching agents for ion adsorbed rare earth ore.
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