Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation

Wu Shuang; Ren Changzai; Yao Xingliang; Yao Yonggang; Wang Wenlong

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Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation

Updated：2026-09-17

- Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation
- Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation
- 中国化学工程学报（英文） 2026年95卷第7期页码：102-112
- Affiliations：
  
  State Key Laboratory of Green Papermaking and Resource Recycling, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
  School of Energy and Power Engineering, Qilu University of Technology, Jinan 250306, China
  School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
  National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan 250061, China
- Author bio：
  
  *Corresponding authors. E-mail addresses:wus130708@163.com(S. Wu)
  *Corresponding authors. E-mail addresses:rcz@qlu.edu.cn(C. Ren).
- Funds：
  
  The authors acknowledge the support of the National Natural Science Foundation of China(52400182);Natural Science Foundation of Shandong Province(ZR2024ME111);Fund of Central Government for Guiding Local Science and Technology Development(YDZX2025021);Central Guidance for Local Scientific and Technological Development fund project in Xinjiang Uygur Autonomous Region(ZYYD20260Y31)
- DOI：
  中图分类号：
- 收稿：2025-07-23，
  
  修回：2026-01-24，
  
  录用：2026-02-01，
  
  网络首发：2026-04-17，
  
  纸质出版：2026-07
- Accepted：
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Wu Shuang, Ren Changzai, Yao Xingliang, 等. Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation[J]. 中国化学工程学报（英文）, 2026,95(7):102-112.

Wu Shuang, Ren Changzai, Yao Xingliang, et al. Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation[J]. Chinese Journal of Chemical Engineering, 2026, 95(7): 102-112.
Wu Shuang, Ren Changzai, Yao Xingliang, 等. Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation[J]. 中国化学工程学报（英文）, 2026,95(7):102-112. DOI：

Wu Shuang, Ren Changzai, Yao Xingliang, et al. Recovery of calcium resources from phosphogypsum in the preparation of sulfoaluminate cement: Decomposition mechanism and minerals formation[J]. Chinese Journal of Chemical Engineering, 2026, 95(7): 102-112. DOI：

摘要

Abstract

Phosphogypsum (PG) is a solid waste generated by the phosphate fertilizer industry. The decomposition of PG allows for the separate recovery of its Ca and S resources. In this work

the decomposition of PG and formation of minerals in the preparation of sulfoaluminate cement (SAC) were studied. Thermodynamics analysis reveals that the formation of SAC minerals accelerates the decomposition of PG by incorporating CaSO

and CaO into the reaction matrix. Experimental results revealed that the formation of SAC minerals effectively reduces the decomposition temperature of PG and increases its decomposition rate. The formation of C

S has the strongest promoting effect on the decomposition of PG. The formation of

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=118491834&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=118491834&type=small

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=118491834&type=middle

generally has a weaker effect in promoting PG decomposition. In contrast

the formation of C

AF and composite minerals not only facilitates efficient PG decomposition but also maintains system stability

preventing melting. The formation of SAC minerals is affected by the decomposition of PG

making it difficult to fully generate the target mineral. The kinetic mechanism of PG decomposition is three-dimensional diffusion reaction

while the mechanism changes to two-dimensional diffusion (cylindrical symmetry) reaction in mineral formation. This study presents novel methodologies for recycling Ca and S resour

ces from PG

paving the way for its efficient utilization.

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