摘要
为了提高湿法浸出低钒钢渣中钒的浸出效率,并对湿法浸出低钒钢渣中钒提供理论依据,从动力学角度分析整个浸出过程。考察温度、液固比、硫酸质量分数和搅拌速率对浸出过程的影响。研究结果表明：在90℃、液固比为10？1以及硫酸浓度6.0mol/L时,浸取9h,低钒钢渣中钒的浸出率可达到95.3%。通过正交实验和动力学推导,得到描述浸出过程的经验方程,低钒钢渣湿法浸出钒的动力学模型为收缩核动力学模型,浸出过程的表观活化能为12.794kJ/mol,该模型表明浸出过程中的控制步骤取决于固膜扩散速率。提高温度、液固比和硫酸质量分数,均可加速钒的浸出速度,提高钒的浸出率。
In order to improve the leaching efficiency of vanadium pentoxide from BOF slag containing low-vanadium oxide and provide theoretical foundations,the whole leaching process was analyzed from the kinetic aspect.The effects of reaction temperature,the liquid-solid ratio,sulphuric acid concentration and stirring speed on the leaching efficiency were investigated.The results show that the leaching rate of vanadium pentoxide can reach 95.3% under the condition of temperature 90 ℃,liquid-solid ratio 10：1,sulfuric acid concentration 6 mol/L,and leaching time 9 h.By means of the orthogonal experiment and kinetic deduction,an empirical equation for the leaching process is established,and the apparent activation energy is 12.794 kJ/mol.The leaching process of BOF slag containing low-vanadium oxide could be simulated with a shrinking core model,which indicates that the control factor of the leaching process is the diffusion rate of reacting reagents in a porous solid layer.The leaching efficiency and speed can be increased by enhancing the temperature,liquid-solid ratio and sulfuric acid concentration.
作者
邱会东
杨治立
田仙丽
朱光俊
Qiu Huidong,Yang Zhili,Tian Xianli,Zhu Guangjun（Chongqing Institute of Science and Technology,Chongqing 401331,China）
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
Rare Metal Materials and Engineering
关键词
低钒钢渣
浸出动力学
收缩核模型
活化能
slag containing low-vanadium oxide
leaching kinetics
shrinking core model
activation energy
