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Huang S.-D.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co. | Chen W.,Chengdu Optical Glass Co. | Liang L.-X.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co. | Jia J.,Shanghai Huaming Gona Rare Earth New Materials Co. | And 2 more authors.
Chinese Rare Earths | Year: 2014

The dispersion of the cerium-based rare earth polishing powder in the dispersion medium was introduced in this paper, and three model was established for evaluation of suspension propersty of the powder. It shoud be provided some guidance for the polishing powder production enterprises and users. The most suitable dispersing agent was screened out from several different dispersants, and the optimum addition level of the dispersant was determined.


Chen L.-D.,Inner Mongolia University of Science and Technology | Chen L.-D.,Inner Mongolia Baotou Steel Rare earth Group Hi Technology Co. | Liu Z.-G.,Inner Mongolia University of Science and Technology | Li D.,Inner Mongolia Baotou Steel Rare earth Group Hi Technology Co.
Chinese Rare Earths | Year: 2013

The adsorption of SO4 in rare earth solution by Zr(OH)4 was studied. The better adsorption condition was confirmed through the orthogonal experiments. The adsorption, desorption and regeneration effect of the Zr(OH)4 adsorbent were discussed systematically. The results showed that Zr(OH)4 adsorption effect for SO4 in rare earth solution was obvious, the amount of SO4 in the solution decreased 88% after two stage adsorption. Zr(OH)4 can be regenerated by adjusting pH value. The regenerated Zr(OH)4 and the fresh Zr(OH)4 have the same adsorption ability for SO4.


Huang S.-D.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co. | Li P.-Z.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co. | Wang X.-J.,Inner Mongolia University of Science and Technology | Song X.-W.,Inner Mongolia University of Science and Technology | Xie M.,Inner Mongolia University of Science and Technology
Chinese Rare Earths | Year: 2013

The phase stability of Yb2O3-Y2O3 - Ta2O5-ZrO2 system was studied. The Yb2O3-Y2O3 - Ta2O5-ZrO2 ceramics were heat treaed at temperatures from 200°C to 1500°C. The phase structure of heat treaed specimens was characterized by X-ray diffraction. The results show that Yb2O3-Y2O3 - Ta2O5-ZrO2 system after heat-treating from 200°C to 1500°C was composed of single tetragonal phase, indicating the Yb2O3-Y2O3 - Ta2O5-ZrO2 system had good phase stability below 1500°C heat treatment. In addition, these compositions exhibit an hjgh and almost composition-independent tetragonality, which may be the cause for the high tetragonal phase stability.


Zhang T.,Inner Mongolia Baotou Steel Rare earth Group Hi Technology Co. | Zhang T.,Baotou Research Institute of Rare Earths | Zhang T.,University of Science and Technology Beijing | Liu C.,Baotou Research Institute of Rare Earths | Zhang Y.,University of Science and Technology Beijing
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | Year: 2015

The La0.6Pr0.4Fe11.4Si1.6B0.2 alloy was produced by using industrial grade raw materials. The phase constituents and thermal magnetic properties of the alloy were characterized by X-ray diffraction with Cu kα radiation and vibration sample magnetism respectively. The influence of hydrogen absorption pressure on magnetocaloric effect and hydrogen desorption process were investigated. Results show that the annealing treated alloy was subjected to hydrogenation at 0.13 and 0.2 MPa, correspondingly its Curie temperature increased to 320 and 321 K respectively. The taking place of dehydrogenation was much easier for the alloy hydrogenated at lower absorption pressure rather than that at higher pressure. The Curie temperature of the alloy hydrogenated at 0.13 MPa and then dehydrogenated at 473K could lower to room temperature range, correpondingly the maximal magnetic entropy of the hydrides decreased while the relative cooling power were increased. © All right reserved.


Zhu X.,Northeastern University China | Sun S.,Northeastern University China | Lu S.,Northeastern University China | Huang X.,Northeastern University China | And 5 more authors.
Thermochimica Acta | Year: 2016

The surface tensions of REF3-LiF (RE = La and Nd) molten salts (REF3 mol% = 20-40%) were measured using the slide method over the temperature range1223-1423 K which was specifically chosen for meeting the actual electrolysis temperature (about 1323 K). The temperature and composition dependences of the surface tensions were investigated. The results showed that the surface tension decreased linearly with the increasing of temperature and increased nonlinearly with the increasing mole fraction of REF3. At 1323 K (near the practical electrolysis temperature), the surface tension of REF3-LiF-RE2O3 molten salts firstly increased with the increasing RE2O3 and reached the maximum value near the solubility of RE2O3 (2-3 g) in REF3-LiF molten salts, and then decreased with the continuously adding RE2O3. The accurate knowledge of the surface tension factor of RE2O3 can be useful for well understanding the solubilizing mechanisms of RE2O3 in REF3-LiF molten salts system. Results of this study well supplemented the experimental data of physiochemical property on surface tension of rare earth fluoride electrolytes. © 2016 Published by Elsevier B.V.


Fu X.,Wuhan University of Science and Technology | Chen Y.,Wuhan University of Science and Technology | Yu G.,Wuhan University of Science and Technology | Zhang K.,Wuhan University of Science and Technology | And 2 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2011

With Pr 6O 11 and Mn(NO 3) 2 as raw materials, ultrafine perovskite PrMnO 3 was prepared by sol-gel method and vacuum drying technology. The perovskite was characterized by TG-DTA, XRD, TEM, and FT-IR. The photocatalytic activity was tested by photocatalysis degrading methyl orange solution in the system of PrMnO 3 suspension, irradiated under ultraviolet lamp. The results showed that at 170°C, the Pr-Mn xerogel was loose khaki powder with good dispersibility. The xerogel was made up of a mass of global grains with uniform size whose diameters were about 10~20 nm. In the process of thermal treating on Pr-Mn xerogel, the crystalline phase Pr 6O 11 and Mn 2O 3 appeared at 500 and 700°C, respectively; The crystallization process of manganese oxide was affected by Pr; After thermal treating at 900°C, the pure crystalling phase ultrafine perovskite PrMnO 3 was prepared, and the particle size was smaller than 100 nm. Taking the 300 W UV lamp as the photo source, 10 mg · L -1 methyl orange degradated by the superfine PrMnO 3 powder, the degradation efficiency was 100% at the radiation time 2 h, this degeneration process was the dynamics first-level reaction.


Jin L.,Beijing Aeronautical Science and Technology Research Institute | Liu G.,Changzhou LanXiang machinery Co. | Li P.,Inner Mongolia Baotou Steel Rare earth Group Hi Technology Co. | Zhou H.,Beijing Aeronautical Science and Technology Research Institute | And 2 more authors.
Ceramics International | Year: 2015

The effects of ceramic dopant species and amount on adhesive strength and thermal shock resistance behavior of nanostructured thermal barrier coatings (TBCs) were investigated in detail. Firstly, nanostructured 5wt% La2O3+3wt% TiO2+92wt% YSZ(5La3TiYSZ), 8wt% La2O3+92wt% YSZ (8LaYSZ) and 8wt% CeO2+92wt% YSZ(8CeYSZ) coatings were prepared using atmospheric plasma spraying (APS) technology under the same technic parameters. Secondly, microstructure, adhesion strength and thermal shock behavior of three kinds of coatings were discussed. The results show that 5La3TiYSZ has the highest adhesion strength and the best thermal shock resistance in three kinds of coatings. The adhesion strength and thermal shock life for nanostructured TBCs heavily depend on ceramic materials. Among dopants nanostructured TiO2, La2O3 and CeO2 oxides, TiO2 can take relatively good effects in YSZ and the reason are also discussed using first principles. © 2015 Elsevier Ltd and Techna Group S.r.l.


Huang S.-D.,Inner Mongolia Baotou Steel Rare earth Group Hi Technology Co | Sun S.-C.,Northeastern University China | Wang H.-H.,Northeastern University China | Tu G.-F.,Northeastern University China | And 2 more authors.
Chinese Rare Earths | Year: 2014

The wettability behavior of Nd2O3-LiF-NdF3 on TiB2/TiC ceramics was investigated using a sessile drop method. The wettability of TiB2-TiC ceramics by NdF3-LiF-Nd2O3 melt combined a physical and chemical wetting process, during which the wetting was fast at the early stage and then became slow when the wetting time was up to 11 min. The contact angle was 14.8°C when the equilibrium was reached. The XRD analysis of the wetting interface of TiB2/TiC ceramics showed that no reaction happened between the Nd2O3-LiF-NdF3 melt and TiB2/TiC ceramics, and the chemical wetting was attributed to the oxidation of TiB2.


Chen H.-C.,Inner Mongolia Baotou Steel Rare Earth Group Hi Technology Co.
Chinese Rare Earths | Year: 2014

Based on the analysis of distribution and occurrence of rare earth in Bayan Obo, this paper studied the beneficiation of Bayan Obo rare earth minerials associated with iron minerals by using floatation. Effects of grinding granularity, dosage of reagents, temperature, pulp density and pH value on floatation index of rare earth were investigated. The results show that the optimal floatation conditions are grinding granularity 20 μm~50 μm, temperature higher than 60℃ and pulp density for rougher floatation 55%~65%.


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INNER MONGOLIA BAOTOU STEEL RARE EARTH GROUP HI Technology CO. | Date: 2012-12-05

Rare earths; rare earth metals; salts from rare earth metals; alloys of rare earth metals; rare earth oxide.

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