Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

doi:10.1016/j.cjche.2016.04.024

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (11): 1552-1560.DOI: 10.1016/j.cjche.2016.04.024

• 第25届中国过程控制会议专栏 • 上一篇下一篇

Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

Chengjun Liu, Qing Zhao, Yeguang Wang, Peiyang Shi, Maofa Jiang

Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, China

收稿日期:2016-02-28 修回日期:2016-04-21 出版日期:2016-11-28 发布日期:2016-12-06
通讯作者: Qing Zhao
基金资助:
Supported by National Science Foundation of China (51374059, 51304042) and the Fundamental Research Funds for the Central Universities of China (N130402020).

Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

Chengjun Liu, Qing Zhao, Yeguang Wang, Peiyang Shi, Maofa Jiang

Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, China

Received:2016-02-28 Revised:2016-04-21 Online:2016-11-28 Published:2016-12-06
Contact: Qing Zhao
Supported by:
Supported by National Science Foundation of China (51374059, 51304042) and the Fundamental Research Funds for the Central Universities of China (N130402020).

摘要/Abstract

摘要： Plenty of flue gas desulfurization (FGD) gypsum generated from coal-fired power plants for sulfur dioxide sequestration caused many environmental issues. Preparing calcium sulfate whisker (CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and utilize calcium sulfate in a high-value-added way. The effects of particle size of FGD gypsum, slurry concentration, and additives on CSW were investigated in this work. The results indicated that fine particle size of FGD gypsum and moderately high slurry concentration were beneficial for crystal nucleation and growth. Three additives of magnesium chloride, citric acid, and sodium dodecyl benzene sulfonate (SDBS) were employed in this study. It was found that mean length and aspect ratio of CSW were both decreased by the usage of magnesium chloride, while a small quantity of citric acid or SDBS could improve the CSW morphology. When multi-additives of citric acid-SDBS were employed, the mean length and aspect ratio increased more than 20%. Moreover, surface morphology of CSW went better, and the particle size and crystal shape became more uniform.

关键词: Calcium sulfate whisker, Hydrothermal, Synthesis, Environment

Abstract: Plenty of flue gas desulfurization (FGD) gypsum generated from coal-fired power plants for sulfur dioxide sequestration caused many environmental issues. Preparing calcium sulfate whisker (CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and utilize calcium sulfate in a high-value-added way. The effects of particle size of FGD gypsum, slurry concentration, and additives on CSW were investigated in this work. The results indicated that fine particle size of FGD gypsum and moderately high slurry concentration were beneficial for crystal nucleation and growth. Three additives of magnesium chloride, citric acid, and sodium dodecyl benzene sulfonate (SDBS) were employed in this study. It was found that mean length and aspect ratio of CSW were both decreased by the usage of magnesium chloride, while a small quantity of citric acid or SDBS could improve the CSW morphology. When multi-additives of citric acid-SDBS were employed, the mean length and aspect ratio increased more than 20%. Moreover, surface morphology of CSW went better, and the particle size and crystal shape became more uniform.

Key words: Calcium sulfate whisker, Hydrothermal, Synthesis, Environment

Chengjun Liu, Qing Zhao, Yeguang Wang, Peiyang Shi, Maofa Jiang. Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum[J]. Chinese Journal of Chemical Engineering, 2016, 24(11): 1552-1560.

Chengjun Liu, Qing Zhao, Yeguang Wang, Peiyang Shi, Maofa Jiang. Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum[J]. Chin.J.Chem.Eng., 2016, 24(11): 1552-1560.

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Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

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