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中文摘要：
采用氯化铝盐酸体系配合浸出包头混合稀土精矿,并对浸出过程动力学进行研究,浸出过程主要考察盐酸和氯化铝的浓度、液固比、搅拌速度、温度及反应时间对精矿浸出的影响。结果表明,随着盐酸和氯化铝的浓度和液固比的增大、反应时间的延长和反应温度的升高,精矿的浸出率逐渐增大,得到的优化浸出工艺条件如下:HCl和AlCl3浓度分别为4.0 mol/L和1.5 mol/L,液固比为20 mL/g,搅拌速度为300 r/min,温度为85℃,时间为90 min。SEM-EDS及动力学分析结果表明,精矿浸出过程符合一种受固体颗粒表面的界面交换和固膜扩散混合控制的新缩小核模型,表观活化能为35.3 kJ/mol,阿伦尼乌斯常数k0=419.95,反应级数a,b和c分别为1.265,1.208和1.22,通过计算推导出反应动力学方程。
英文摘要：
The complex leaching kinetics of Baotou mixed rare earth concentrate in HCl-AlCl3 solution was investigated. The effects of HCl concentration, AlCl3 concentration, liquid to solid ratio, stirring speed, temperature and reaction time were investigated. The results indicate that the concentrate leaching ratio increases with increasing the HCl and AlCl3 concentrations, liquid to solid ratio, temperature and reaction time. The optimal conditions are as follows:concentrations of HCl and AlCl3 are 4.0 mol/L and 1.5 mol/L, respectively, the liquid to solid ratio is 20 mL/g, the stirring speed is 300 r/min, temperature is 85 ℃, reaction time is 90 min. The SEM-EDS and kinetic analysis show that the concentrate leaching conforms with a new shrinking core model, in which both the interfacial transfer and diffusion through the product layer affect the reaction rate. The apparent activation energy is 35.3 kJ/mol, the Arrhenius constant k0 is 419.95, and the reaction series a, b, c are 1.27, 1.21 and 1.22, respectively. A kinetic equation was derived to describe the process.
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