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Xiao H.-J.,Jiangxi University of Science and Technology | Lan Q.-F.,Jiangxi University of Science and Technology | Huang J.,Jiangxi University of Science and Technology | Nie H.-P.,Jiangxi University of Science and Technology | And 5 more authors.
Chinese Rare Earths | Year: 2015

Double-solvent extraction system P507 and N235 was used to make the non-saponification extraction process based on the ability of P507 to extract RE and N235 to extract acid. Under the condition of 5 minute oscillation, phase ratio in 1: 1 and the solution acidity 2 to 3, the extracting ability of double-solvent system was increased with the increasing of atomic number and RE concentration in solution. Under the best condition of 8 minute oscillation, phase ratio in 1: 1 and RE concentration at 1.0 mol/L, this paper has measured the average seperating factors between each RE element. The result can offer theory for P507-N235 system to apply to actual production. © 2015, Editorial Office of "Chinese Rare Earths". All right reserved.


Yang Y.,Jiangxi University of Science and Technology | Yang Y.,Key Laboratory for Development and Application of Ionic Rare Earth | Lan Q.,Jiangxi University of Science and Technology | Deng S.,Jiangxi University of Science and Technology | And 4 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2013

The salty waste water generated by saponification in the rare earth extraction process has greatly given rise to environmental pollution. A double solvent system of P507 and N235, which extract rare earth ions and acids respectively, was designed for rare earth extraction without saponification. The chemical stability and synergistic effect of P507-N235 system for Nd3+ were investigated and the experimental results showed that chemical structure of the mixed extractants was stable after extraction-regeneration process although mixing of P507 and N235 was an exothermic reaction with changing characteristic peaks in their infrared spectra. A significant synergistic effect was achieved and the as-prepared complex in extraction was REA3·(R3N·HA) · 3R3NHCl. The results obtained may contribute to the development of non-saponification rare earth extraction process.


Ye X.,Jiangxi University of Science and Technology | Ye X.,Key Laboratory for Development and Application of Ionic Rare Earth | Wu L.,Jiangxi University of Science and Technology | Yang M.,Jiangxi University of Science and Technology | And 7 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2013

The stripping performance and subsequent precipitation process of dual solvent (plus sulfonated kerosene and cyclohexane)extraction system were investigated. The stripping ability of hydrochloric acid to neodymium-loaded organic phase and precipitation procedure of oxalic acid on rare earths were studied as an example. The results showed that P507-N235-kerosene-cyclohexane system had a good stripping performance. It seemed that the rare earths concentration in load organic phase had no effect on the rare earths stripping process. The optimum stripping conditions at room temperature were determined as follows: oscillation time was 15 min, feed phase proportion 1:1, acidity 3 mol·L-1, the single-stage stripping rate of Nd 98% or more and complete phase separation in one minute. The precipitation rate reached 99% when rare earth Nd was precipitated with 1.15 times the theoretical amount of oxalic acid.

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