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Classification and High Efficient Leaching of Ion Adsorption Rare Earth Based on Its pH Dependence
Author NameAffiliationE-mail
XU Qiu-Hua Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China 
 
YANG Li-Fen Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China  
ZHANG Li Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China  
LI Cui-Cui Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China  
WANG Da-Shan Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China  
ZHOU Xin-Mu Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China  
ZHOU Xue-Zhen Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China  
LI Yong-Xiu Research Center for Rare Earths & Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, China yxli@ncu.edu.cn 
Abstract: The pH value dependence of leaching efficiency (LE) of ion adsorbed rare earth (IARE) and the main co-existing impurity ions leached by ammonium sulfate is studied. The results show that the LE of IARE and calcium magnesium increases with increasing acidity in the range of low acidity; however, no further significant increase is observed when employing high concentration of acid solution. While the LE of some easily hydrolyzed metal ions such as Al, Fe, Sc increases continuously with the increase of acidity. Therefore, based on the definition of ion adsorption rare earth and the range of pH value needed for leaching different kinds of IARE, the IARE is further divided into two types:easy leaching and hard leaching. The hard leaching IARE is absorbed by strong absorbents such as colloid particles and 2:1 type clay minerals, and could only be leached under weak acidity condition (pH ≤ 4). The ratio of these two types of adsorbed rare earth ions is different due to the amount of strong adsorbent contained in samples from different regions and different deposit layers as well as different particle levels, and depending on the abrasive pH(pHd) and exchange pH(pHt) of mineral sample. For the samples with high pHd and high pHt value, the LE of IARE can be significantly improved by increasing the leaching acidity. Accordingly, a sequence leaching process by adding an acid leaching process and a washing process with water and lime solution after general ammonium sulphate leaching was proposed to ensure the LE of IARE and the safety of tailing.
Keywords: ion adsorption rare earth  leaching efficiency  pH dependence  electrolyte
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XU Qiu-Hua,YANG Li-Fen,ZHANG Li,LI Cui-Cui,WANG Da-Shan,ZHOU Xin-Mu,ZHOU Xue-Zhen,LI Yong-Xiu.Classification and High Efficient Leaching of Ion Adsorption Rare Earth Based on Its pH Dependence[J].Chinese Journal of Inorganic Chemistry,2018,34(1):112-122.
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Chinese Journal of Inorganic Chemistry