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国家自然科学基金(0450065)

作品数:2 被引量:7H指数:2
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Adsorption-extraction mechanism of heavy rare earth by Cyanex272-P507 impregnated resin被引量:4
2010年
Instrument of IR spectrometer and methods of saturation, equimolar series change and slope were applied to study the extraction mechanism of Cyanex272-P507 impregnated resin for heavy rare earths from hydrochloric acid solution. The results show that the molar ratio of Cyanex272-P507 to rare earth in the extraction complex is 3. Chlorine ions do not participate in coordination. The extraction reaction can be expressed as RE3+(a) + 3-HA(r) + 3/2HL(r)= [REA3/2L3/2](r) + 3H+(a) (where HA represents 2 2 Cyanex272 and HL represents P507). The synergic extractant formed in extraction chromatography is in a form ofmonopolymer and with a chemical structure of REA3/2L3/2.
廖春发焦芸芬梁勇姜平国聂华平
关键词:CYANEX272P507
Study on the diffusion kinetics of adsorption of heavy rare earth with Cyanex272-P507 impregnated resin被引量:4
2010年
Kinetics of adsorption of heavy rare earth with Cyanex272-P507 impregn ated resin was studied. The influences of temperature,concentration,granularit y of resin on the exchange degree were investigated by the limited bath method. The result showed that the controlling factor of RE3+/H+ diffusion on Cyanex272-P507 extraction resin was particles diffusion. The process of diffuse kinetics f itted well with the expression developed by Body model. The apparent activation energy was determined as 23.20 kJ/mol. The reaction order was 0.452. In addition,the constant of particles diffusion(D0) was 1.352×10-8 m2/S and the entropy of diffusion was-47.055 J/(mol·K).
廖春发聂华平焦云芬梁勇杨少华
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