Time filter

Source Type

Yang G.-S.,Northeastern University China | Yang G.-S.,Baotou Tianjiao Seimi Rare earth Polishing Powder Co. | Bian X.,Northeastern University China | Cui L.-X.,Baotou Tianjiao Seimi Rare earth Polishing Powder Co. | And 3 more authors.
Chinese Rare Earths | Year: 2017

This paper first proposed a way to prepare nano cerium oxide solid powder by spray roasting in tube furnace with the cerium chloride solution as raw material and citric acid as an additive. Differential thermal, XRD, SEM and other study means were used to analyze the influence factors of CeO2 conversion rate and the content of Cl-. The results showed that the conversion rate of calcined CeO2 increased with increasing temperature, and decreased with increasing CeCl3 concentration. Under the conditions of CeCl3 concentration 50 g/L and calcination temperature 800℃, the conversion rate can reach 97.4%. Contrast to the conversion rate of CeO2, residual content of Cl- decreased with increasing temperature and increased with increasing CeCl3 concentration. When CeCl3 concentration was 50 g/L and calcination temperature reached 800℃, the residues of Cl- was 0.47%. The results also showed that,under the conditions of calcination temperature 600℃, the concentration of cerium chloride solution 100 g/L, citric acid concentration 0.029 mol/L, solid spherical CeO2 powder with high crystalline and good sphericity can be obtained, and the addition of citric acid is not affected the conversion rate of the product CeO2. © 2017, Editorial Office of "Chinese 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.


Yang G.-S.,Northeastern University China | Yang G.-S.,Baotou Tianjiao Seimi Rare Earth Polishing Powder Co. | Yang G.-S.,Inner Mongolia Rare Earth Polishing Materials Engineering Technology Research Center | Cui L.-X.,Baotou Tianjiao Seimi Rare Earth Polishing Powder Co. | And 5 more authors.
Chinese Rare Earths | Year: 2013

The roasting process of preparation of rare earth polishing powder was studied by using XRD, scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results show that the roasting process consists of four stage, the dehydration of rare earth carbonate fluorine carbonate decomposition, the formation of intermediate compound of rare earth oxygen-fluorine and the formation of rare earth oxides; Rare earth polishing powder is mainly composed of two phases, solid solution phase of La3+ in CeO2 lattice and phase of CeLa2O3F3, and the two-phase interface is not clear. Heterogeneous nuclestion mainly occurred in rosting process. Crystal growth in (111) planes was faster than that in (200) planes when roasting time was less than 450 minutes. When roasting for longer than 450 minutes, the crystal grains exhibited approximate spherical shape. With increase of roasting time, the lattice constant and lattice distortion decreased.

Loading Baotou Tianjiao Seimi Rare Earth Polishing Powder Co. collaborators
Loading Baotou Tianjiao Seimi Rare Earth Polishing Powder Co. collaborators