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Chang H.,Inner Mongolia University of Science and Technology | Chang H.,Inner Mongolia Autonomous Universities | Li M.,Inner Mongolia University of Science and Technology | Li M.,Inner Mongolia Autonomous Universities | And 5 more authors.
Advanced Materials Research | Year: 2012

The Ce(III) extraction kinetics with di-(2-ethylhexyl)phosphoric acid (D2EHPA) in the presence of a complexing agent acetic acid(HAc) has been investigated using constant interfacial cell with laminar flow. The kinetics mechanism and extraction rate equation were achieved by the studies on the effect of stirring rate, temperature and specific interfacial area on the rate of extraction. The effect of temperature on the kinetics was analyzed, the value of the apparent activation energy was calculated as 11.96 kJ/mol, and it was found that the extraction process was a diffusion-controlled kinetics regime. © (2012) Trans Tech Publications, Switzerland.


Chang H.,Inner Mongolia University of Science and Technology | Chang H.,Inner Mongolia Autonomous Universities | Li M.,Inner Mongolia University of Science and Technology | Li M.,Inner Mongolia Autonomous Universities | And 5 more authors.
Advanced Materials Research | Year: 2012

The Nd(III) extraction kinetics by 2-ethylhexylphosphonic acid mono-(2-ethylhexyl) ester (HEH/EHP) in the presence of a complexing agent acetic acid(HAc) has been investigated using constant interfacial cell. The kinetics mechanism and extraction rate equation were achieved by the studies on the effect of stirring rate, temperature and specific interfacial area on the rate of extraction. The effect of temperature on the kinetics was analyzed, the value of the apparent activation energy was calculated as 9.24 kJ/mol, and it was found that the extraction process was a diffusion-controlled kinetics process. © (2012) Trans Tech Publications, Switzerland.


Chang H.,Inner Mongolia University of Science and Technology | Chang H.,Inner Mongolia Autonomous Universities | Li M.,Inner Mongolia University of Science and Technology | Li M.,Inner Mongolia Autonomous Universities | And 5 more authors.
Journal of Rare Earths | Year: 2010

The effect of the feed acidity, acetic acid concentration and rare earth concentration on the distribution ratio, separation coefficient and extraction capacity of light rare earth elements were studied in the P204(DEHPA)-HCl system and P507(HEH/EHP)-HCl system both containing acetic acid, respectively. The results showed that the distribution ratio and separation coefficient decreased with increasing of acidity, and increased with increasing of acetic acid concentration and rare earths concentration, and the extraction capacity increased with increasing of acetic acid concentration. When pH value of feed was 2.0, [RE]/[acetic acid] was 1:1 and rare earth concentration 0.35 mol/L, in P204(DEHPA)- HCl system with acetic acid, the maximum separation coefficient(β) reached to βCe /La=4.09, βPr/Ce=1.96 and βNd/Pr=1.53, and the separation ability of this extraction system was better than P507(DEHPA)-HCl system. © 2010 The Chinese Society of Rare Earths.

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