Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第8期    总第185期    2014年8月

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文章编号:1004-0609(2014)08-2137-08
包头稀土精矿的配合浸出及动力学
张晓伟1, 2,李 梅1, 2,柳召刚1,胡艳宏1, 2,王觅堂1,刘 佳1,阳建平1

(1. 内蒙古科技大学 材料与冶金学院,包头 014010;
2. 北京化工大学 材料科学与工程学院,北京 100029
)

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。

 

关键字: 氯化铝;盐酸;浸出;稀土精矿;动力学;活化能

Complex leaching and kinetics of Baotou mixed rare earth concentrate
ZHANG Xiao-wei1, 2, LI Mei1, 2, LIU Zhao-gang1, HU Yan-hong1, 2, WANG Mi-tang1, LIU Jia1, YANG Jian-ping1

1. School of Materials and Metallurgy, Inner Mongolia Science and Technology University, Baotou 014010, China;
2. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Abstract: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.

 

Key words: aluminium chloride; hydrochloric acid; leaching; mixed rare earth concentrate; kinetics; activation energy

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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