石煤提钒碱浸过程动力学研究

Kinetics of Leaching Vanadium with Alkaline from Stone Coal

研究了石煤空白焙烧料NaOH溶液浸出过程中液固比、NaOH溶液初始浓度、反应搅拌速率、矿石粒径、温度对浸出速率的影响,确定了石煤提钒碱浸过程动力学方程式,计算了反应的表观活化能。结果表明:液固比、反应搅拌速率对浸出速率的影响不大,NaOH溶液初始浓度、矿石粒径、浸出温度对浸出速率的影响显著;V2O5的浸出动力学适用于收缩未反应芯模型,浸出反应服从化学反应控制过程;根据Ar-rhenius公式,使用曲线拟合法,近似求得该反应表观活化能约为58.5k.Jmol-1,进一步表明该反应属于化学反应控制。

The effects of liquid to solid ratio,initial NaOH solution concentration,stirring speed,the size of particle,and temperature on leaching rate in the process of extracting vanadium by roasting-alkaline leaching from stone coal were investigated.The leaching kinetics equation was identified,and the apparent activation energy of the reaction was calculated.The results showed that liquid to solid ratio,stirring speed nearly had little effect on the leaching rate,and initial NaOH solution concentration,the size of particle,and temperature affect vanadium leaching rate apparently.Leaching kinetics equation could be modeled with the shrinking core model indicates that leaching process was controlled by surface chemical reaction.According to Arrhenius equation,the kinetic apparent activation energy was calculated as about 58.5 kJ·mol-1 by using curve fitting.It further indicated that the leaching process was controlled by surface chemical reaction.