Dissolution kinetics of vanadium trioxide at high pressure in sodium hydroxide-oxygen systems

被引:33
作者
Qiu, Shuang [1 ]
Wei, Chang [1 ]
Li, Minting [1 ]
Zhou, Xuejiao [1 ]
Li, Chunxiong [1 ]
Deng, Zhigan [1 ]
机构
[1] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Peoples R China
基金
中国国家自然科学基金;
关键词
Vanadium trioxide; Pressure oxidation; Sodium hydroxide; Leaching kinetics; FLY-ASH;
D O I
10.1016/j.hydromet.2010.08.005
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The dissolution kinetics of pure vanadium trioxide in an alkaline-oxygen system was investigated. The effects of temperature (80-130 degrees C), oxygen partial pressure (200-700 kPa), initial sodium hydroxide concentration (0.1-2 M), and stirring speed (200-1000 rpm) on the vanadium dissolution rate were studied. The experimental data showed that the vanadium dissolution rate increased with increasing temperature and oxygen partial pressure; stirring speeds above 800 rpm and sodium hydroxide concentrations above 1.0 M had very little effect on the dissolution rate. The kinetics analyses of the experimental data for various experimental conditions indicated that the dissolution process was controlled by the chemical reaction during the early stage of dissolution, with an activation energy of 45.3 kJ/mol, and was then controlled by liquid-film diffusion, with an activation energy of 11.6 kJ/mol. In the initial stage of dissolution, the reaction orders with respect to sodium hydroxide concentration and oxygen partial pressure were 0 and 0.75, respectively. (C) 2010 Published by Elsevier B.V.
引用
收藏
页码:350 / 354
页数:5
相关论文
共 16 条
[1]  
BRADBURY S, 2002, VANADIUM GEOLOGY PRO, P115
[2]   Sulphuric acid pressure leaching of a limonitic laterite: chemistry and kinetics [J].
Georgiou, D ;
Papangelakis, VG .
HYDROMETALLURGY, 1998, 49 (1-2) :23-46
[3]  
HABASHI F, 2002, VANADIUM GEOLOGY PRO, P3
[4]  
Habashi F, 1969, PRINCIPLES EXTRACTIV, VI
[5]  
HANAFI Z, 1974, INDIAN J TECHNOL, V12, P507
[6]  
HU J, 2004, CHINESE J RARE METAL, V30, P711
[7]   Kinetics of alkaline leaching of pure zinc oxide [J].
Lee, HS ;
Piron, DL .
CHEMICAL ENGINEERING COMMUNICATIONS, 1995, 138 :127-143
[8]  
Levenspiel O., 1979, CHEM REACTION ENG, V3rd
[9]   Kinetics of vanadium dissolution from black shale in pressure acid leaching [J].
Li, Minting ;
Wei, Chang ;
Qiu, Shuang ;
Zhou, Xuejiao ;
Li, Cunxiong ;
Deng, Zhigan .
HYDROMETALLURGY, 2010, 104 (02) :193-200
[10]  
LIAO SM, 1985, VANADIUM METALLURGY, P210