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Wu X.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Wang J.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Li B.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Zhang T.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2016

A new procedure was tested for the purpose to obtain dephosphorized concentrate of iron minerals from Bayan Obo ores for smelting steel, while partially recovering the rare earth elements and niobium in the deposit. For the ores containing 1.05% P, 0.19% Nb2O5, the procedure used reverse flotation to remove phosphorite and rare earth minerals with sodium oleate as the collector in basic solutions. Iron concentrate was obtained from the tailing of reverse flotation by weak magnetic separation, the final concentrate contained 0.46% P and 68% Fe with a recovery rate of 80%; Nb minerals of 0.65% grade were recovered from the tailing of magnetic separation with 44.04% recovery. RE minerals of Grade of 12% were recovered from the products of reverse flotation with a recovery rate 90% relative to the original ores. Thus, this experiment provided a useful procedure for obtaining dephosphorized iron concentrate and meanwhile partially recovering of RE and Nb minerals from Bayan Obo deposit. © 2016, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved.


Cheng L.,Inner Mongolia University of Science and Technology | Cheng L.,Baotou Tianjiao Seimi Rare earth Polishing Powder Co. | Ren H.-P.,Inner Mongolia University of Science and Technology | Ren H.-P.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | And 2 more authors.
Chinese Rare Earths | Year: 2015

Ceria-based rare earth polishing powder was prepared with lanthanum cerium carbonate and neodymium-poor RE carbonate as precursor. The influence of fluorine content on phase composition and morphology and the change of morphology of polishing powder particles before and after grinding were investigated. The results show that the ceria-based rare earth polishing powder consists of the base phase Ce1-xLaxO2 and the second phase which distribute in the base phase. The second phase is changed from CeF2 to LaF2 and LaF3 with the increase of fluorine content. By comparing what happened before and after the experiment, the particles are obviously grinded at the particles sharp angle. The grinding occurs at (001) direction. It is find that (100) crystal plane is increased and (111) crystal plane is induced at the end of grinding. © 2015, Editorial Office of "Chinese Rare Earths". All right reserved.


Chen W.-P.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Chen W.-P.,Inner Mongolia University of Science and Technology | Zhang H.,Inner Mongolia University of Science and Technology | Xie Z.-H.,Inner Mongolia University of Science and Technology | Ji Y.-P.,Inner Mongolia University of Science and Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Isothermal oxidation experiment at 950-1250℃ in vertical tube furnace for a low-carbon and low-alloy steel containing anthanum-cerium rare earth compound was carried out. The oxidation kinetics curves were plotted by thermal gravity analysis (TGA) method. Morphology of the surface oxidation films was observed by scanning electron microscopy (SEM). The results show that the isothermal oxidation kinetic curves at 950℃, 1050℃, 1150℃ and 1250℃ all conform to the parabolic laws and the oxide film has the protective effect. The reaction activation energy of the low-carbon and low-alloy steel is increased and the oxidation rate constant is reduced by the addition of rare earth, so the high-temperature oxidation resistance of the steel is improved, and the steel with higher content of rare earth exhibits the higher high-temperature oxidation resistance. By adding the lanthanum-cerium rare earth compound, the grains of the surface oxidation films of the low-carbon and low-alloy steel are refined and the binding strength between the oxidation films and the matrix is improved, so the oxidation films are not easy to peel off, which is beneficial to improving the oxidation resistance of the steel. © 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Si W.,Inner Mongolia University of Science and Technology | Liu J.,Inner Mongolia University of Science and Technology | Cai L.,Inner Mongolia University of Science and Technology | Jiang H.,Inner Mongolia University of Science and Technology | And 6 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2015

The consumption of water and food crops contaminated with metals is a major food chain route for human exposure. We investigated the health risks of metals in Yellow River (YR) water, farmland soil and spring wheat in the Baotou region, northern China. Data indicated that long-term irrigation with polluted YR water led to metal accumulation in local farmland soil and spring wheat. The consumption of YR water and spring wheat in Baotou region can cause adverse health effects to local people, specifically because of Hg, Pb, and Se in YR water and Cu, Zn, Cd, and Mn in spring wheat. The integrative risk of various metals depends mainly on the spring wheat intake. Current results emphasized the need for routine monitoring and management in order to avoid contamination of YR water and spring wheat from the wastewater irrigation system in Baotou region. © Springer Science+Business Media New York 2014.


Zhang T.-Z.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Zhang T.-Z.,Inner Mongolia University of Science and Technology | Wang J.-Y.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Li B.-W.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | And 3 more authors.
Chinese Rare Earths | Year: 2015

The distribution and association of REE, Nb and Th in Bayan Obo ore were studied by ICP. Measurements of average concentration (x), occurrence frequency with respect to concentration and standard deviation (σ) indicated that the distribution profiles in general were similar to normal distribution; however, at the very low and very high concentrations, the curves deviated greatly from normal distribution. The degrees of cooperative occurrence or association of major light REE in ore blocks were as high as 0.92. Meanwhile, Nb was weakly associated with REE with an association coefficient to be 0.037, and Th was negatively associated with REE with an association coefficient to be -0.2. Our findings have important implication for enrichment and separation of multi minerals in Bayan Obo ores. Specifically, the lowly concentrated REE can be enriched along with La or Ce that are easily measured due to high concentration; Nb and Th can be enriched independently from REE by appropriate methods, e.g. X-ray picking, due to their weak or negative association with REE. ©, 5015, Editorial Office of Chinese Rare Earths. All right reserved.


Ma L.,Inner Mongolia University of Science and Technology | Ma L.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Zhao Z.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Li Y.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Ding W.,Inner Mongolia University of Science and Technology
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Characteristic of Nb and Ti precipitates of high strength low alloy (HSLA) weathering steel with high Niobium was observed and analyzed by optical microscope(OM), thermal field emission scanning electron microscope(FE-SEM) and transmission electron microscopy(TEM). The results show that the Nb and Ti precipitates of the steel are face-centered cubic structure. Most precipitates are Nb and Ti phase precipitate together with a large size and are mainly distributed in the grain boundary. Two kinds of single phases are found in the steel. One is cubic TiN with a relatively large size, another is Nb-rich or Ti-rich Nb and Ti carbonitrides, most of which exceed the size of 50 nm. The complex precipitates are made up of the core based on the Ti-rich precipitates (Ti, Nb)C and the hat based on the Nb-rich precipitates (Nb, Ti)C, whose average size is 150 nm. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Liu Z.-X.,Inner Mongolia University of Science and Technology | Hu Y.-S.,University of Science and Technology of China | Wu Y.-F.,Inner Mongolia University of Science and Technology | Wu Y.-F.,Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | And 2 more authors.
Chinese Rare Earths | Year: 2015

In this paper a mathematic model of 3KA rare earth electrolysis cell was developed by using the finite-element analysis software ANSYS WORKBENCH to analyze the impact of several different common anode carbon block material on the electric filed of rare earth electrolysis cell. Calculation results show that melt voltage of semi-graphitic, semi-graphitized and graphitized anode carbon block are 5.8575V, 5.7699V, 5.6791V. Through the comprehensive consolidation, choosing graphitized electrode can reduce costs and improve the overall economic benefits of rare earth industry. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved.


Wang H.-Y.,Inner Mongolia University of Science and Technology | Wang H.-Y.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Gao X.-Y.,Beris Engineering and Research Corporation | Ren H.-P.,Inner Mongolia University of Science and Technology | And 3 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2014

The α-Fe Σ3[110] (112) symmetrical tilt grain boundary model is established by the coincidence site lattice theory. First-principles plane wave ultrasoft pseudopotential method based on the density functional theory is used to calculate the La occupying tendency in α-Fe. The results show that La elements tend to be located at grain boundary in the α-Fe since the impurity formation energy keeps lowest. On this basis, the electronic structure of La doped in α-Fe grain boundary is also calculated. The results indicate that the charges in the system are redistributed to provide more electrons for the grain boundary bonding when the La occupies α-Fe grain boundary. Meanwhile, Fe atoms obtain more electrons, and the La doped region combination has the ion-tendency toward strengthening the interaction between La atom and Fe atoms in the adjacent boundary region, and the Fe atom bonds in the grain boundaries and on both sides of the grain boundary also strengthen, which is the reason why the mechanical properties change from the energy point of view. Moreover, La addition also makes the atomic density of states on the grain boundary move to the left, reduce the total energy of the system, and make the grain boundary more stable. © 2014 Chinese Physical Society.


Hou J.,Inner Mongolia University of Science and Technology | Ji Y.,Inner Mongolia University of Science and Technology | Jin X.,Inner Mongolia University of Science and Technology | Ren H.,Inner Mongolia University of Science and Technology | Ren H.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Bainite tempering transformation of 20MnCrNi2Mo steel was investigated by Rockwell hardness tester, scanning electron microscope and transmission electron microscope. The results show that when the granular bainite of 20MnCrNi2Mo steel is tempered at 200 ℃, the decomposition of M/A islands are not happened basically. M/A islands decompose gradually with the increase of tempering temperature. When tempered at 500 ℃, a lot of M/A islands decompose, the dislocation density decreases and the carbides precipitate. When tempered at the range of 200-500 ℃, the change of hardness is not obvious. The hardness decreases sharply when the tempering temperature is higher than 500 ℃ because of complete decomposition of M/A islands and growing up of carbides. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Liu X.,Inner Mongolia University of Science and Technology | Liu X.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Ji Y.,Inner Mongolia University of Science and Technology | Ren H.,Inner Mongolia University of Science and Technology | Ren H.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

The CCT curve of the tested steel was gained by means of a combined method of dilatometry, metallography and hardness. The results show that, the critical point Ac1, Ac3, and Ms of 20MnCrNi2MoRE wear-resistant cast steel are 699, 844, 368℃ respectively. There are only two structural transformation zones, bainite transformation zone and martensite transformation zone, and no proeutectoid ferrite precipitation and pearlitic transformation zone in the CCT curve of the tested steel. The critical quenching cooling rate is 6℃/s, and there are two kinds of structural transformation-bainite transformation and martensite transformation when the cooling rate is in range of 0.03℃/s to 6℃/s, and only martensite transformation occurs when the cooling rate is more than 6℃/s. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

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