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27卷    第10期    总第223期    2017年10月

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文章编号:1004-0609(2017)-10-2164-06
铝酸钾溶液碳酸化分解的动力学
孙迎姣1,王 菊1,杜春华1,郑诗礼2,张 懿2

(1. 青岛农业大学 化学与药学院,青岛 266109; 2. 中国科学院 过程工程研究所,北京 100080)

摘 要: 对铝酸钾溶液碳酸化分解过程进行研究,建立碳酸化分解过程的动力学模型。借鉴拜耳法晶种分解的动力学模型,对碳分动力学数据进行多元回归,得到动力学方程。结果表明:碳酸化分解的表观活化能为39.2708 kJ/mol,说明铝酸钾溶液碳酸化分解需要突破的壁垒小;瞬时晶种量对碳酸化分解过程的影响较小;相比铝酸钠溶液碳酸化分解,苛碱浓度对铝酸钾溶液分解的影响更大。铝酸钾溶液在40~80℃碳化分解,所得氢氧化铝为拜耳石型。

 

关键字: 铝酸钾溶液;碳酸化分解;动力学模型;多元线性回归;表观活化能

Kinetics of carbonation decomposition of potassium aluminate solution
SUN Ying-jiao1, WANG Ju1, DU Chun-hua1, ZHENG Shi-li2, ZHANG Yi2

1. College of Chemistry and Pharmacy, Qingdao Agricultural University, Qingdao 266109, China; 2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

Abstract:The kinetics of carbonation decomposition of potassium aluminate solution was investigated and the kinetic model was established. Referencing seeded precipitation model, the kinetic equation was deduced through multiple linear regression according to experimental data. The equation shows that the apparent activation energy is 39.2708 kJ/mol, demonstrating that the carbonation decomposition reaction of potassium aluminate solution is easier than that of sodium aluminate solution. The instantaneous seed quantity has a small effect on the process of carbonation decomposition; the alkali concentration has more significant impact on the carbonation decomposition of potassium aluminate solution than that of sodium aluminate solution. XRD analysis demonstrates that the obtained products at 40-80 ℃ belong to Gibbsite Al(OH)3.

 

Key words: potassium aluminate solution; carbonation decomposition; kinetic model; multiple linear regression; apparent activation energy

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

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

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