碳酸锂碳化三相反应动力学研究

利用5 L的气液固三相机械搅拌反应器,研究了Li2CO3碳化三相反应动力学。对影响碳化过程的诸因素进行了深入的研究和探讨。结果表明,Li2CO3的碳化率随CO2压力、气流大小、搅拌速度的增大而增大;随反应温度、固体浓度、颗粒粒径、物料填充度的增大而减小。通过对实验数据的拟合得出实验范围内该过程的动力学方程;得出该过程受控于化学反应,并计算出了该过程的表观活化能-17.37 kJ/mol。该研究为Li2CO3碳化工艺条件的优化和反应器的设计等问题提供了基本理论依据。

Kinetic study on direct carbonation of Li2CO3 slurries by CO2

Kinetics on Li2CO3 carbonation by CO2-water solution was studied. The experiments were carried out in a 5 L gas-liquid-solid three-phase mechanically-agitated slurry-bed reactor. Parameters influencing the dissolution of Li2CO3 were investigated. It showed that the dissolution rate of Li2CO3 increased with the increasing of CO2 pressure, CO2 flow rate and agitation speed, and decreased with the increasing of reaction temperature, solid concentration, Li2CO3 particle size, slurry filling degree. The process was controlled by chemical reaction, and the equation correlated can express the kinetics of the process properly. The apparent activation energy - 17.37 kJ/mol was obtained after calculation. The study provides the theoretical basis for the reactor design and the optimization of the process operation.