Dissolution kinetics and thermodynamic analysis of vanadium trioxide during pressure oxidation

作     者：Zhou, Xuejiao Wei, Chang Xia, Wentang Li, Minting Li, Cunxiong Deng, Zhigan Xu, Hongsheng 

作者机构：Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China School of Metallurgical and Materials Engineering Chongqing University of Science and Technology Chongqing 401331 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2012年第31卷第3期

页      面：296-302页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by the National Natural Science Foundation of China (No. 50874053) National High Technology Research and Development Program "863" Program of China (No. 2006AA06Z130) 

主　　题：hydrometallurgy kinetics oxygen pressure acid leaching thermodynamics vanadium 

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.