Dissolution kinetics and thermodynamic analysis of vanadium trioxide during pressure oxidation
来源期刊：Rare Metals2012年第3期
论文作者：ZHOU Xuejiao a, b, WEI Changa, XIA Wentang b, LI Minting a, LI Cunxiong a, DENG Zhigan a, and XU Hongshenga a Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming , China b School of Metallurgical and Materials Engineering, Chongqing University of Science and Technology, Chongqing , China
文章页码：296 - 302
摘 要：The dissolution kinetics of vanadium trioxide in sulphuric acid-oxygen medium was examined. It was determined that the concentration of sulphuric acid and stirring speed above 800 r min 1 did not significantly affect vanadium extraction. The dissolution rate increased with increasing temperature and oxygen partial pressure, but decreased with increasing particle size. The dissolution kinetics was controlled by the chemical reaction at the surface with the estimated activation energy of 43.46 kJ·mol-1. The leaching mechanism was confirmed by characterizing vanadium trioxide and the dissolution residue using SEM-EDS analysis. Combined with thermodynamic calculation, the pressure leaching of vanadium trioxide in the temperature range （100 to 140 ℃） studied occurs as follows: V2O3 + O2 + H2SO4 = （VO2）2SO4 + H2O.
摘要：The dissolution kinetics of vanadium trioxide in sulphuric acid-oxygen medium was examined. It was determined that the concentration of sulphuric acid and stirring speed above 800 r min 1 did not significantly affect vanadium extraction. The dissolution rate increased with increasing temperature and oxygen partial pressure, but decreased with increasing particle size. The dissolution kinetics was controlled by the chemical reaction at the surface with the estimated activation energy of 43.46 kJ·mol-1. The leaching mechanism was confirmed by characterizing vanadium trioxide and the dissolution residue using SEM-EDS analysis. Combined with thermodynamic calculation, the pressure leaching of vanadium trioxide in the temperature range （100 to 140 ℃） studied occurs as follows: V2O3 + O2 + H2SO4 = （VO2）2SO4 + H2O.
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