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| 1 | Effects of organic acids on the leaching process of ion-adsorption type rare earth ore显示文摘To examine the activation of organic acids on the leaching process of ion-adsorption type rare earth ore(IRE-ore), the leaching behavior of rare earth(RE) and zeta potential of IRE-ore were investigated in the absence and presence of carboxylic acids. The results show that all the tested organic acids(acetic acid,malonic acid, citric acid, tartaric acid, succinic acid, and malic acid) can promote RE extraction. At relatively high concentrations of organic acids, the activation efficiency of organic acids on RE extraction is generally consistent with their complexation ability; whereas at their low concentrations, the change of zeta potential on the IRE-ore surface with organic acid concentration and p H has a close association with RE extraction, which indicates that organic acids can impact the surface electrical property of IREore via their adsorption/desorption, and thereby increase/decrease the affinity of RE ions to IRE-ore.Therefore the influence of organic acids on the IRE-ore surface electrical property also plays an important role in RE extraction in addition to their complexation with RE ions. | Li Wang Chunfa Liao Youming Yang Haibo Xu Yanfei Xiao Chunhua Yan | 2017 | Journal of Rare Earths2017，35，12： | 23 |
| 2 | Cathodic reduction process of Al-Cu-Y alloy in fluoride-oxide eutectic system via molten salt electrolysis显示文摘Al-Cu-Y alloys were prepared by molten salt electrolysis in fluoride-oxide system composed of electrolyte(Na_3 AlF_6-AlF_3-LiF-MgF_2) and oxide(Al_2 O_3-CuO-Y_2 O_3). Cathodic reduction process of Al_2 O_3,CuO and Y_2 O_3 were analyzed by cyclic voltammetry and chronoamperometry. Components and phase composition of alloy samples prepared by potentiostatic electrolysis were characterized by scanning electron microscopy and energy dispersive spectroscopy. The results show that the Al-Cu-Y alloy can be prepared in the AIF_3-NaF-5 wt%LiF-5 wt%MgF2(NaF/AlF_3 = 2.2, molecular ratio) eutectic system with mixed oxide(Al_2 O_3-CuO-Y_2 O_3) through 2 h at the conditions of a temperature of 1208 K, cell voltage3.0 V, cathode current density 0.7 A/cm^2. Al(Ⅲ) and Cu(Ⅱ) ions can be reduced to zero valence Al(0) and Cu(0) directly on carbonaceous electrode surface by instantaneous nucleation, respectively, the reduction process is controlled by diffusion. The reduction potential of Y(Ⅲ) ions is close to the active ions of fluoride melts, but strengthened phase AI3 Y can be formed through electrochemical reduction and alloyed process with active Al(Ⅲ) and Cu(Ⅱ) ions, meanwhile, the Al_2 Cu and Al_3 Y phases are distributed at the grain boundary of Al matrix. | Xu Wang Chunfa Liao Yunfen Jiao Hao Tang | 2018 | Journal of Rare Earths2018，36，3： | 6 |
| 3 | Electrodeposition of magnesium-yttrium alloys by molten salt electrolysis显示文摘 | Shaohua YANG Fengli YANG Chunfa LIAO Mingzhou Li Xu WANG | 2010 | Journal of Rare Earths2010，，： | 1 |
| 4 | Electrodeposition of magnesium-yttrium alloys by molten salt electrolysis显示文摘 | Shaohua YANG Fengli YANG Chunfa LIAO Mingzhou Li Xu WANG | 2010 | Journal of Rare Earths2010，，： | 1 |
| 5 | Density of Na3AIF6-AIF3-LiF-MgF2-Al2O3-Sm2O3 molten salt melt for Al-Sm alloy显示文摘Samarium(Sm) has been widely used in making aluminum(Al)-Sm magnet alloy materials. The research team for this study developed a molten salt electrolyte system which directly produces AI-Sm alloy to replace the energy intensive conventional distillation technology. In this study, molten melt density was measured and operation conditions were optimized to separate AI-Sm alloy product from the fluoride molten melt electrolysis media based on density differences, Archimedes' principle was applied to measure density for the basic molten fluoride system(BMFS: Na_3 AlF_6-AlF_3-LiF-MgF_2)electrolysis media in the temperature range from 905 to 1055 ℃.The impact of temperature(t) and the Al_2O_3 and Sm_2O_3 addition ratio(w_((Al2O3)),w_((Sm2O3)) in the basic fluoride system on molten melt density was examined. The fluoride molten melt density relationship was determined to be:ρ=3.11701-0.00802 w_((Al2O3))+0.027825 w_((Sm2O3))-0.00117 t. The test results showed that molten density decreases with increase in temperature and Al_2O_3 addition ratio, and increases with the addition of Sm_2O_3, and/or Al_2O_3+Sm_2O_3. The separation of Al-Sm(density 2.3 g/cm^3) product melt from the BMFS melt is achieved by controlling the BMFS density to less than 2.0 g/cm3. It is concluded that the optimal operation conditions to control the BMFS molten salt density to less than 2.0 g/cm^3 are:maintain addition of Al_2O_3+Sm_2 O_3(w_((Al2O3))+w_((Sm2O3))<9% of Na_3AlF_6,Al_2O_3/Sm_2O_3 ratio(w_((Al2O3)):w_((Sm2O3)))> 7:3, and temperature between 965 and 995 ℃. | Yunfen Jiao Xu Wang Chunfa Liao Jia Su Hao Tang Boqing Cai Qiangchao Sun | 2018 | Journal of Rare Earths2018，36，2： | 1 |
| 6 | Identification of ions present in LiF-DyF_3 melts and the mechanism of Dy_2O_3 dissolution therein显示文摘Herein, the present paper were attempted to identify ions in LiF-DyF_3 melts according to the law of decreasing primary crystallization temperature and model analysis. Specifically.the primary crystallization temperatures of LiF-DyF_3 and LiF-DyF_3-Dy_2O_3 melts with various DyF_3 and Dy_2O_3 contents were determined by differential scanning calorimetry(DSC), and reactions occurring in the above melts were investigated using ideal dilute solution(Temkin and Flood) models. Moreover, crystal phases produced by rapid solidification of LiF-DyF_3, LiF-Dy_2O_3, DyF_3-Dy_2O_3, and LiF-DyF_3-Dy_2O_3 melts were identified by X-ray diffraction(XRD) analysis. The primary crystallization temperature of LiF-DyF_3 melts exhibits an approximately linear decrease with increasing molar fraction of DyF_3, and the general formula of complex ions in these melts is expressed as DyF_x^((3-x)),e.g., DyF_4^-. Finally, we investigated the dissolution of Dy_2O_3 in LiF-DyF_3 melts, showing that it was chemical in nature and afforded Dy_(1+x)O_(3x)F_(3-3x) and DyOF. | Chunfa Liao Shumei Chen Xu Wang Boqing Cai Jueyuan Lin Yunfen Jiao Yanliang Zeng | 2019 | Journal of Rare Earths2019，37，2： | 1 |
| 7 | Reduction of SO2 to elemental sulfur over rare earth-iron catalysts显示文摘With coal gas as a reducing agent, the catalytic reduction of SO2 to sulfur in the flue gas produced in metallurgical processes was studied over catalysts of rare earth-Fe/Al2O3 (REFe/Al2O3). The catalytic activity of the REFe/Al2O3 catalyst on the reduction of SO2 to sul-fur was investigated based on kinds and the contents of rare earths and different preparation method of the catalyst. Additionally, the mecha-nism of this catalytic reduction reaction was also explored. Results showed that different rare earth imposed different effect on the activity of the Fe/Al2O3 catalyst. Especially, the addition of Sm and Dy greatly improved the catalytic activity of Fe/Al2O3. The yield of sulfur over SmFe/Al2O3was increased to 86.62% at 360 ℃, which was 40.5% higher than that over Fe/Al2O3at the same temperature; and the sulfur yield over DyFe/Al2O3was increased to 91.62% at 400 ℃, 26.4% higher than that over Fe/Al2O3. The catalytic activity of REFe/Al2O3 was somehow dependent on the content of rare earth. For SmFe/Al2O3, the content of Sm was optimized to be about 1.0 wt.%. The rare earth catalyst prepared with different methods also showed varied activity. The sulfur yield over rare-earth transition metal catalysts follows the order: Sm and iron solution mixing impregnationSm first, then iron solution impregnationiron first, then Sm solution impregnation. The reaction mechanism of SO2 reduction to sulfur with coal gas was proposed to be an intermediate mechanism. | DENG Gengfeng JIANG Kun CAO Xia LIAO Chunfa | 2009 | Journal of Rare Earths2009，27，5： | 0 |
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