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Du G.-X.,Beijing Materials University | Du G.-X.,Hebei Yingdu Composite Materials Co. | Xue Q.,Beijing Materials University | Ding H.,Beijing Materials University | Li Z.,Beijing Materials University
International Journal of Mineral Processing | Year: 2015

Abstract Mechanochemical effects of ZnO powders in a wet grinding system were characterized by the changes of ZnO particle micrograph, crystal structure, surface group, and water solubility during the grinding process. In addition, the Williamson-Hall formula was used to show the trend of changes in ZnO crystal size and lattice deformation. The results suggested that in a wet grinding system, the primary function of mechanical power was to prompt formation of crystal defects on ZnO rather than reduction in crystal size of ZnO. The mechanical grinding activated ZnO particles, decreased the binding energy between Zn and O, improved the solubility of ZnO, and formed more associating hydroxyls. As the concentration of Zn2+ in solution increased to a certain level, recrystallization of ZnO might take place. Both crystal size and lattice deformation of ZnO showed fluctuation under the combined action of recrystallization and formation of crystal defects. © 2015 Elsevier B.V. Source


Du G.,Beijing Materials University | Du G.,Hebei Yingdu Composite Materials Co. | Xue Q.,Beijing Materials University | Ding H.,Beijing Materials University | Li Z.,Beijing Materials University
Indian Journal of Engineering and Materials Sciences | Year: 2013

In this paper, mechanochemical effect of brucite powder in a wet ultrafine grinding process is studied. The results show that fresh surfaces of brucite particles are formed during the grinding process. The solubility of Mg(OH)2 increases in the first 3 h of grinding. The crystal size and lattice deformation of brucite particles decrease in the first 3 h and are leveled off after 3 h. As the concentrations of Mg2+ and OH- ions increase to a certain level, recrystallization would occur. The dominant face for comminution and recrystallizaiton of Mg(OH)2 occur mainly on the (001) and the newly formed crystals are easily maintained due to less comminution on (110) face. Source

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