Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process

Weixin Zheng; Jinmei Dong; Baolan Li; Yuanrui Li; Qiang Wang; Jing Wen; Chenggong Chang

doi:10.1016/j.cjche.2025.05.007

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Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process

Updated：2026-01-06

- Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process
- Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process
- 中国化学工程学报（英文版） 2025年85卷第9期页码：294-303
- Affiliations：
  
  1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lake. Chinese Academy of Sciences,Xining,China,810008
  2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,China,810008
  3. Qinghai Provincial Key Laboratory of Plateau Climate Change and Corresponding Ecological and Environmental Effects, Qinghai University of Science and Technology,Xining,China,810016
- Author bio：
- Funds：
  
  This work was financially supported by the Natural Science and Engineering Technology in Qinghai Province (2023), the Qinghai Province “Kunlun Talents” High end Innovation and Entrepreneurship Talent Project (2023), the Western Young Scholars Program of Chinese Academy of Sciences (2024;2022000018), the National Natural Science Foundation of China (52404189), the Open Fund of Key Laboratory of Green and High-end Utilization of Salt Lake Resources (ISL2024-15), and, the Independent deployment project of the Qinghai Salt Lake Research Institute, CAS (E455HX3501).
- DOI：10.1016/j.cjche.2025.05.007
  中图分类号：
- 纸质出版：2025
- Accepted：
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Weixin Zheng, Jinmei Dong, Baolan Li, 等. Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process[J]. 中国化学工程学报（英文版）, 2025,85(9):294-303.

Weixin Zheng, Jinmei Dong, Baolan Li, Yuanrui Li, Qiang Wang, Jing Wen, Chenggong Chang. Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 294-303.
Weixin Zheng, Jinmei Dong, Baolan Li, 等. Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process[J]. 中国化学工程学报（英文版）, 2025,85(9):294-303. DOI： 10.1016/j.cjche.2025.05.007.

Weixin Zheng, Jinmei Dong, Baolan Li, Yuanrui Li, Qiang Wang, Jing Wen, Chenggong Chang. Preparation of magnesium phosphate cement by salt lake magnesium slag and its hydration process[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 294-303. DOI： 10.1016/j.cjche.2025.05.007.

摘要

Abstract

Magnesium phosphate cements (MPC) have shown promising applications in many fields

but high raw material prices hinder their development. The production of salt lake MPC (SLMPC) from magnesium slag (MS)

a byproduct of lithium extraction from salt lakes

offers significant environmental and economic advantages. In this study

a low-cost magnesia raw material was obtained through the calcination of MS

which was subsequently utilized in conjunction with KH

to prepare SLMPC. The changes in hydration products

microscopic morphology

solution pH value

and TG content during the SLMPC curing process

and the hydration kinetics equation and model were used to study the hydration processes of SLMPC. The results show that the outcome indicates that the SLMPC system entered the accelerated reaction stage within 6 min after mixing

where the highest heat release rate was 6.29 J·g

-1

·min

-1

the maximum heat release was 205.3 J·g

-1

and the main hydration product appeared at 50-60 min. The hydration behavior of SLMPC exhibits similarities to that of traditional MPC. Specifically

the acceleration phase is governed by an autocatalytic reaction

the deceleration phase is influenced by both autocatalytic reactions and diffusion processes

and the stabilization phase is predominantly controlled by diffusion mechanisms. This paper aims to establish the theoretical foundation for the industrial application of MS and the cost-effective production

of MPC.

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