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Shen Y.-Y.,Jiangxi Agricultural University | Yuan P.,Jiangxi Golden Century Advanced Materials Company Ltd | Liu M.-X.,Jiangxi Agricultural University | Xiong Y.-F.,Jiangxi Agricultural University | And 2 more authors.
Chinese Rare Earths | Year: 2014

By using hydrolysis method, aluminum ion in leaching solution of yttrium-medium and europium-rich mineral can be largely removed before extraction separation process. The reaction quotient Q value and Ksp value of Al(OH)3 precipitation were measured under different experiment conditions including pH, concentration, temperature and aging time. aluminum removal efficiency can reach 97% in experiment indicating that direct application of hydrolysis method in aluminum removal from the leaching solution is feasible. Compared with extraction method, hydrolysis method provides several advantages, such as simple process, no demand of additional facilities and low cost; thus holds great promise for industrial application.

Yang Y.,Jiangxi University of Science and Technology | Huang Z.,Jiangxi University of Science and Technology | Deng S.,Jiangxi University of Science and Technology | Shen W.,Jiangxi University of Science and Technology | And 2 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2014

Water washing was used to remove the residual acid from complex organic phase of P507-N235 system. It was found that the phase ratio and water temperature both influenced the removal of residual acid. The phase ratio should be controlled smaller, and the water temperature should be controlled at above 70°C. The concentration of residual acid should be controlled lower than 0.1 mol·L-1, then the complex organic phase could be recycled. Experiment of counter current extraction and cross current extraction showed the residual acid content was difficult to be washed to below 0.1 mol·L-1 by current extraction. While the concentration of residual acid could be controlled below 0.1 mol·L-1 by cross current extraction when the ratio of organic and water phase was 1:5 and washing-stages was 6. It was found that the organic phase could be recycled when residual acid was strictly controlled. The distribution ratios and separation coefficient of rare earths kept constant as repeatedly reused.

Peng H.,Nanchang University | Ma Y.,Nanchang University | Liu W.,Nanchang University | Xu X.,Nanchang University | And 6 more authors.
Journal of Energy Chemistry | Year: 2015

A series of Ni/La2Zr2O7 pyrochlore catalysts prepared by impregnation method and treated by dielectric barrier discharge (DBD) plasma in different atmospheres and varied sequences were prepared and applied for dry reforming of methane (DRM). It is found that all of the plasma treated catalysts show evidently improved activity and coke resistance in comparison with the non-plasma treated one. The best performance is achieved on Ni/La2Zr2O7-H2P-C, a catalyst treated in H2 plasma before calcination. TGA-DSC and SEM demonstrate that carbon deposition is significantly suppressed on all of the plasma treated samples. Moreover, XRD and TEM results testify that both NiO and Ni sizes on the calcined and reduced samples treated by plasma are also decreased, which results in higher Ni metal dispersion on the reduced and used catalysts and enhances the interactions between Ni sites and the support. It is believed that these are the inherent reasons accounting for the promotional effects of plasma treatment on the reaction performance of the Ni/La2Zr2O7 pyrochlore catalysts. © 2015 Science Press and Dalian Institute of Chemical Physics. All rights reserved.

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