| 磷酸体系中微量稀土元素萃取动力学研究 |
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| 引用本文： | 王良士,彭新林,李明来,黄小卫,龙志奇,崔大立. 磷酸体系中微量稀土元素萃取动力学研究[J]. 中国稀土学报, 2009, 27(6) |
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| 作者姓名： | 王良士 彭新林 李明来 黄小卫 龙志奇 崔大立 |
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| 作者单位： | 北京有色金属研究总院稀土材料国家工程研究中心有研稀土新材料股份有限公司,北京,100088 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 采用新型恒界面池法进行了磷酸体系中用P204萃取La(Ⅲ),Sm(Ⅲ)和Y(Ⅲ)的动力学研究,考察了搅拌速度、温度、比界面积、磷酸浓度及萃取剂浓度等因素对萃取速率的影响.结果表明:磷酸体系中用P204萃取La(Ⅲ),Sm(Ⅲ)和Y(Ⅲ)的表观活化能E_a分别为27.0,22.2和21.1 kJ·mol~(-1),在体相P204浓度大于在液一液界面饱和吸附时的最低浓度C_(min)时,其在界面已达到吸附饱和,反应的主通道由界面变为体相,在该体系下P204萃取La(Ⅲ),Sm(Ⅲ)和Y(Ⅲ)反应为体相化学反应和扩散反应混合控制.
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| 关 键 词： | 萃取动力学 恒界面池 磷酸 稀土 |
Extraction Kinetics of Trace Rare Earths from Phosphoric Acid |
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| Wang Liangshi,Peng Xinlin,Li Minglai,Huang Xiaowei,Long Zhiqi,Cui Dali. Extraction Kinetics of Trace Rare Earths from Phosphoric Acid[J]. Journal of the Chinese Society of Rare Earths, 2009, 27(6) |
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| Authors: | Wang Liangshi Peng Xinlin Li Minglai Huang Xiaowei Long Zhiqi Cui Dali |
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| Abstract: | The extraction kinetics of lanthanum, sa-marium and yttrium by P204 from phosphoric acid were investigated using a novel quiescent interface extraction cell with laminar flow. The effects of stirring speed, temperature, specific interface, phosphoric acid con-centration and extraction concentration were studied. The results indicated that the extraction apparent acti-vation energy of lanthanum, samarium and yttrium was calculated to be 27.0, 22.2 and 21.1 kJ·mol~(-1), re-spectively. The reaction channels turned from inter-face to bulk phase when the concentration of P204 ex-ceeded its minimum concentration of interface adsorp-tion saturation. And the extraction process might be controlled by a mixed mechanism of diffusion and chemical reaction. |
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| Keywords: | extraction kinetics quiescent interface extraction cell phosphoric acid rare earths |
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