The crystal transformation characteristics from dihydrate gypsum to α-hemihydrate gypsum in Mg(NO3)2 solution

Yunfei Li; Xinyue Deng; Shiqin Yin; Li Lv; Shengwei Tang; Tao Zhang

doi:10.1016/j.cjche.2025.07.009

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The crystal transformation characteristics from dihydrate gypsum to α-hemihydrate gypsum in Mg(NO₃)₂ solution

Updated：2026-02-12

- The crystal transformation characteristics from dihydrate gypsum to α-hemihydrate gypsum in Mg(NO₃)₂ solution
- The crystal transformation characteristics from dihydrate gypsum to α-hemihydrate gypsum in Mg(NO₃)₂ solution
- 中国化学工程学报（英文版） 2025年88卷第12期
- Affiliations：
  
  School of Chemical Engineering, Sichuan University,Chengdu,China,610000
- Author bio：
- Funds：
  
  This work was financial supported by the Opening Project of Hubei Yihua-Sichuan University Joint Innovation Research Center for new chemical materials (24H1402);Fundamental Research Funds for the Central Universities (SCU2024D009);the National Key Research and Development Program of China (2019YFC1905800).
- DOI：10.1016/j.cjche.2025.07.009
  中图分类号：
- 纸质出版：2025
- Accepted：
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Yunfei Li, Xinyue Deng, Shiqin Yin, 等. The crystal transformation characteristics from dihydrate gypsum to α-hemihydrate gypsum in Mg(NO₃)₂ solution[J]. 中国化学工程学报（英文版）, 2025,88(12). DOI: 10.1016/j.cjche.2025.07.009.

-hemihydrate gypsum in Mg(NO
Yunfei Li, Xinyue Deng, Shiqin Yin, 等. The crystal transformation characteristics from dihydrate gypsum to α-hemihydrate gypsum in Mg(NO₃)₂ solution[J]. 中国化学工程学报（英文版）, 2025,88(12). DOI: 10.1016/j.cjche.2025.07.009. DOI：

-hemihydrate gypsum in Mg(NO DOI： 10.1016/j.cjche.2025.07.009.

摘要

Abstract

The preparation of high-strength

-hemihydrate gypsum (

-HH) from dihydrate gypsum (DH) is a potential way to improve the utilization rate of industrial gypsum.

-HH with a low aspect ratio was prepared by atmospheric salt solution method

using Mg(NO

)

solution as the salt medium. The effects of reaction temperature

reaction time

Mg(NO

)

concentration

pH value

and the solid-to-liquid ratio on the purity

yield and aspect ratio of the product were investigated systematically. Under the optimal reaction conditions of 95 ℃

4 h

40% (mass) Mg(NO

)

pH 5

and a solid-liquid ratio of 1:5

the yield and purity of the product could reach 89.67% and 99.85%

respectively. Additionally

the average aspect ratio of this product was 2.02

and the compressive strength reached 58.2 MPa. The regulation mechanism was studied by calculating the adsorption energies of Mg(NO

)

on different crystal planes of

-HH

which indicated that Mg(NO

)

exhibited the strongest adsorption on the (1 1 1) plane

and this preferential adsorption retarded the axial growth of

-HH

resulting in a reduced aspect ratio of the crystals. These findings suggest that the Mg(NO

)

solution is an effective approach for preparing high-strength

-HH with controlled morphology.

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