Citation: Wen-Jing MA, Li-Li GAO, Yun LI, Xue-Qing CHEN, Hong-Fei GUO, Zhi-Shui LI, Ji-Lin CAO. Two-Step Preparation of Quasi-Spherical α-Calcium Sulfate Hemihydrate from Flue Gas Desulphurization Gypsum[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(8): 1430-1438. doi: 10.11862/CJIC.2021.167 shu

Two-Step Preparation of Quasi-Spherical α-Calcium Sulfate Hemihydrate from Flue Gas Desulphurization Gypsum

Wen-Jing MA ¹ ,
Li-Li GAO ^{1, 2} ,
Yun LI ^1,, ,
Xue-Qing CHEN ¹ ,
Hong-Fei GUO ¹ ,
Zhi-Shui LI ³ ,
Ji-Lin CAO ¹

1.
Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
2.
Heze Center for Disease Control and Prevention, Heze, Shandong 274010, China
3.
Tianjin Bohua Yongli Chemical Industry Co., Ltd., Tianjin 300452, China

Corresponding author: Yun LI, liyun@hebut.edu.cn
Received Date: 4 January 2021
Revised Date: 7 May 2021

Figures(7)

The quasi-spherical α-calcium sulfate hemihydrate (α-CSH) with the size of 6~10 μm has been synthesized from flue gas desulphurization (FGD) gypsum by two-step hydrothermal method under the regulation of N, N'-methylenediacrylamide (MBA). The effect of MBA addition on the morphology and size of α-CSH product and the regulation mechanism was investigated by FTIR and EDS measurements as well as ethylene glycol concentration-dependent experiments. MBA could be preferentially absorbed on the (111) plane of α-CSH to inhibit the growth of α-CSH along c axis, and form a three-dimensional gel network to exert the confinement effect on the nucleation and growth of α-CSH particles. In addition, after undergoing physical washing and two-step chemical hydrothermal treatment, the whiteness of the synthesized α-CSH was improved from 39.22% to 92.06%.
- flue gas desulphurization gypsum,
- α-calcium sulfate hemihydrate,
- two-step hydrothermal treatment,
- N, N'-methylenebisacrylamide
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沈阳化工大学材料科学与工程学院沈阳 110142