Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process

doi:10.1016/j.cjche.2020.05.021

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (8): 2221-2226.DOI: 10.1016/j.cjche.2020.05.021

• Materials and Product Engineering • 上一篇

Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process

Jing Gao^1,4, Qiang Li^1,4, Fuli Liu^2,3

1 College of Mining, Liaoning Technical University, Fuxin 123000, China;
2 CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3 College of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

收稿日期:2019-09-10 修回日期:2020-05-01 出版日期:2020-08-28 发布日期:2020-09-19
通讯作者: Fuli Liu
基金资助:
This project was supported by the State Key Laboratory of Mineral Processing Science and Technology Open Fund (BGRIMM-KJSKL-2017-16), Liaoning Provincial Department of Education Youth Project (LJ2017QL028) and Coal Resource Safety Mining and Clean Utilization Engineering Research Center Open Fund (LNTU15KF18).

Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process

Jing Gao^1,4, Qiang Li^1,4, Fuli Liu^2,3

1 College of Mining, Liaoning Technical University, Fuxin 123000, China;
2 CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3 College of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

Received:2019-09-10 Revised:2020-05-01 Online:2020-08-28 Published:2020-09-19
Contact: Fuli Liu
Supported by:
This project was supported by the State Key Laboratory of Mineral Processing Science and Technology Open Fund (BGRIMM-KJSKL-2017-16), Liaoning Provincial Department of Education Youth Project (LJ2017QL028) and Coal Resource Safety Mining and Clean Utilization Engineering Research Center Open Fund (LNTU15KF18).

摘要/Abstract

摘要： In this paper, the solid waste desulfurization gypsum produced by coal-fired power plants was used as a raw material to prepare calcium sulfate whiskers with high application prospects. Calcium sulfate whiskers with uniform morphology and high aspect ratio can be prepared by hydrothermal method in sulfuric acid solution. A new process of desulfurization gypsum activated by high-energy grinding to reduce the reaction temperature and sulfuric acid concentration was developed. Through the comparison of product morphology, the best grinding time was determined to be 3.5 h. The mechanism of desulfurization gypsum through physical-chemical coupling to reduce energy consumption was clarified. The activation of desulfurization gypsum by grinding and the acidic environment provided by the sulfuric acid solution made the calcium sulfate solution reached rapid saturation and accelerated the nucleation rate. By calculating the conversion and crystallization rate of calcium sulfate whiskers, it was found that there were obvious “autocatalytic” kinetic characteristics during the crystallization process.

关键词: Flue gas desulfurization gypsum, Calcium sulfate whiskers, Crystallization kinetic, Physical-chemical coupling

Abstract: In this paper, the solid waste desulfurization gypsum produced by coal-fired power plants was used as a raw material to prepare calcium sulfate whiskers with high application prospects. Calcium sulfate whiskers with uniform morphology and high aspect ratio can be prepared by hydrothermal method in sulfuric acid solution. A new process of desulfurization gypsum activated by high-energy grinding to reduce the reaction temperature and sulfuric acid concentration was developed. Through the comparison of product morphology, the best grinding time was determined to be 3.5 h. The mechanism of desulfurization gypsum through physical-chemical coupling to reduce energy consumption was clarified. The activation of desulfurization gypsum by grinding and the acidic environment provided by the sulfuric acid solution made the calcium sulfate solution reached rapid saturation and accelerated the nucleation rate. By calculating the conversion and crystallization rate of calcium sulfate whiskers, it was found that there were obvious “autocatalytic” kinetic characteristics during the crystallization process.

Key words: Flue gas desulfurization gypsum, Calcium sulfate whiskers, Crystallization kinetic, Physical-chemical coupling

Jing Gao, Qiang Li, Fuli Liu. Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process[J]. 中国化学工程学报, 2020, 28(8): 2221-2226.

Jing Gao, Qiang Li, Fuli Liu. Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process[J]. Chinese Journal of Chemical Engineering, 2020, 28(8): 2221-2226.

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Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process

Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical-chemical coupling production process

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