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Start Over Author "Li, Jinhui" Journal powder technology
12 results on '"Li, Jinhui"'

8. Non-isothermal kinetic studies of rubidium extraction from muscovite using a chlorination roasting-water leaching process

Author

Xiaoqiang Yu, Lei Tian, Li Jinhui, Chongwei Liu, Ao Gong, Xuan-gao Wu, and Zhifeng Xu

Subjects
Chemistry, General Chemical Engineering, Muscovite, Kinetics, Analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Activation energy, engineering.material, 021001 nanoscience & nanotechnology, Isothermal process, Rubidium, Metal, 020401 chemical engineering, visual_art, visual_art.visual_art_medium, engineering, Leaching (metallurgy), 0204 chemical engineering, 0210 nano-technology, Roasting
Abstract

Rubidium in muscovite was selectively extracted using a chlorination roasting-water immersion method. The experimental results revealed that the chlorination effects of this metal were best when the roasting temperature was 800 °C. After 30 min of water immersion, the extraction rate of rubidium was the highest (96.71%), and XRD and SEM-EDS were used to analyze the migration transformation of elements and the phase changes that occurred during the chlorination roasting process. Finally, the non-isothermal kinetics of the muscovite chlorination roasting process was investigated via TG-DTA. The results revealed that the most probable mechanism for this process in non-isothermal conditions was the 3-D diffusion (Z-L-T) model with the integral form with g(a) = [(1-α)-1/3–1]2. The activation energy was determined to be 216.92 kJ·mol−1. Furthermore, the kinetic equation for fitting the results was formulated.

Published
2020

12. Synthesis and characterization of monodispersed BaSO4/Y2O3:Eu3+ core–shell submicrospheres

Author

Zhang, Ming, Li, Xinhai, Wang, Zhixing, Guo, Huajun, Li, Jinhui, and Liu, Wanrong

Subjects
*PHOSPHORS, *BARIUM sulfate, *INORGANIC synthesis, *DISPERSION (Chemistry), *MICROSTRUCTURE, *SURFACE coatings, *CHEMICAL processes, *MATERIALS analysis
Abstract

Abstract: Spherical BaSO4 particles have been coated with Y2O3:Eu3+ phosphor layers (BaSO4/Y2O3:Eu3+) by the wet chemical method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dipersive spectroscopy (EDS), photoluminescence spectra were utilized to characterize the BaSO4/Y2O3:Eu3+ core–shell-structured phosphor particles. The obtained core–shell phosphors consist of well dispersed submicron spherical particles with narrow size distribution. XRD result shows that no reaction occurred between the BaSO4 cores and the Y2O3:Eu3+ shells even after annealing at 1400 °C. TEM and EDS results show that BaSO4 particles are well coated with the shell of Y2O3:Eu3+. The BaSO4/Y2O3:Eu3+ core–shell particles show a red emission corresponding to 5D0−7F2 of Eu3+ under the excitation of ultraviolet. [Copyright &y& Elsevier]

Published
2009
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