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

doi:10.1016/j.cjche.2025.05.007

Chinese Journal of Chemical Engineering ›› 2025, Vol. 85 ›› Issue (9): 294-303.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

Weixin Zheng^1,2, Jinmei Dong^1,2, Baolan Li³, Yuanrui Li^1,2, Qiang Wang^1,2, Jing Wen^1,2, Chenggong Chang^1,2

1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lake. Chinese Academy of Sciences, Xining 810008, China;
2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China;
3. Qinghai Provincial Key Laboratory of Plateau Climate Change and Corresponding Ecological and Environmental Effects, Qinghai University of Science and Technology, Xining 810016, China

Received:2024-12-29 Revised:2025-03-10 Accepted:2025-05-06 Online:2025-06-02 Published:2025-09-28
Contact: Jinmei Dong,E-mail:dongda839@isl.ac.cn;Baolan Li,E-mail:sunnylbl@163.com
Supported by:
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).

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

Weixin Zheng^1,2, Jinmei Dong^1,2, Baolan Li³, Yuanrui Li^1,2, Qiang Wang^1,2, Jing Wen^1,2, Chenggong Chang^1,2

1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lake. Chinese Academy of Sciences, Xining 810008, China;
2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China;
3. Qinghai Provincial Key Laboratory of Plateau Climate Change and Corresponding Ecological and Environmental Effects, Qinghai University of Science and Technology, Xining 810016, China

通讯作者: Jinmei Dong,E-mail:dongda839@isl.ac.cn;Baolan Li,E-mail:sunnylbl@163.com
基金资助:
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).

Abstract

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 KH₂PO₄ 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.

Key words: Magnesium phosphate cements, Magnesium slag, Microstructure, Utilization of salt lake resources, MgO

摘要： 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 KH₂PO₄ 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.

关键词: Magnesium phosphate cements, Magnesium slag, Microstructure, Utilization of salt lake resources, MgO

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.

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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

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