Dissolution reactivity and kinetic model of low-grade limestone

被引：0
|
作者：
Gu S. [1 ]
Zhang W. [1 ]
Chen Z. [1 ]
Wang H. [1 ]
You C. [1 ,2 ]
机构：
[1] Department of Energy and Power Engineering, Tsinghua University, Beijing
[2] Shanxi Research Institute for Clean Energy, Tsinghua University, Shanxi, Taiyuan
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 12期
关键词：
dissolution; dolomite; internal diffusion control; kinetic; low-grade;
D O I：
10.11949/0438-1157.20220864
中图分类号：
学科分类号：
摘要：
The non-creation and non-regeneration of limestone resources lead to the shortage of high-grade limestone and the continuous decline of limestone grades. The application of low-grade limestone leads to a decrease in the efficiency of the desulfurization system, which has gradually become a frequent accident in the industry. In order to study the dissolution kinetics of low-grade limestone in acidic environment, the effects of experimental variables including reaction temperature, slurry pH and initial particle size are investigated, respectively. The results show that the dolomite [CaMg(CO3)2] is the main impurity in low-grade limestone which has a much lower dissolution rate than that of CaCO3 in acidic environment. The dissolution process of low-grade limestone is mainly controlled by the internal diffusion. In addition, a semi empirical dissolution kinetic equation of low-grade limestone is established based on the shrinkage model of unreacted core. © 2022 Chemical Industry Press. All rights reserved.
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页码：5547 / 5554
页数：7
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