固氟氯化铵焙烧法从包头稀土矿中回收稀土的动力学

Kinetics on chlorinating rare earth of Baotou mixed concentrate after fixed fluorine treatment

研究了固氟氯化铵焙烧法分解包头混合型稀土精矿回收稀土的动力学。结果表明:固氟焙砂的氯化反应过程符合Bagdasarym提出的区域反应速率模型,氯化反应过程经过了两个串联反应步骤,且反应生成物的核按一个方向长大;反应速率方程遵从Erofeev方程的串联反应步骤模型,反应表观活化能Ea为36.831kJ·mol-1,过程控制步骤是内扩散控制。

The kinetics on chlorinating the rare earth of Baotou rare earth mixed concentrate after fixed fluorine treatment was determined. The results indicate that the chlorination of rare earth for fixed fluorine calcine accords with the regional reaction rate model which was raised by Bagdasarym and it has experienced two steps in series, furthermore the nuclear of the resultant is growing in one direction. The equation of reaction rate obeys Erofeev Equation, apparent activation energy(E_a) is 36.831 kJ·mol^(-1), the steps of process control is internal diffusion control.