Study on Enrichment of Thorium and Cerium in Rare Earth Concentrate by Chlorination AITranslate

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Chinese Library Classification Number:TF845.6[冶金工程—有色金属冶金]

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By thermodynamic calculations of reactions of MgCl₂and AlCl₃with rare earth concentrates,Xray diffractometer(XRD)and inductively coupled plasma optical emission spectrometer(ICP-AES),the chlorination capabilities of MgCl₂and AlCl₃were compared,and the phase composition of the reaction products between Bayan Obo rare earth concentrate and MgCl₂or AlCl₃was determined,as well as the contents of rare earths and thorium in the filtrate after water leaching of the products.The study also investigated the chlorination effects of MgCl₂and AlCl₃on rare earth oxides(La₂O₃,CeO₂,Nd₂O₃,Pr6O11,etc.)and ThO₂,as well as their enrichment effects on Th and Ce.The results indicate that AlCl₃has a greater chlorination ability towards rare earth concentrate than MgCl₂,but the reaction products contain fluorinated and phosphorylated rare earths,which prevents effective enrichment of cerium and thorium.The optimal conditions for separating rare earths and thorium from Bayan Obo rare earth concentrate by roastingleaching are as follows:molar ratio of RE in rare earth concentrate to MgCl₂of 1∶1.3,roasting time of 4 h,roasting temperature of 700℃,and water leaching time of 1 h.Under these conditions,the enrichment rate of thorium reaches 82.5%,and the enrichment rate of cerium reaches 95.4%.