Hydration mechanism of hydrated magnesium citrate: The effects of MgCl2

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-08-19 DOI:10.1111/ijac.14894

Jianjun Chen, Guoqing Xiao, Donghai Ding

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Abstract

In this study, the evolutions of kinetic parameters, such as hydration temperature, pH, and electrical conductivity, were observed to investigate the hydration mechanism of hydrated magnesium citrate (HMC). Additionally, the effects of MgCl₂ on the hydration behavior of HMC and the working performance of its bonded castables were also investigated. The results show that the hydration mechanism of HMC is dissolution–precipitation, and its hydration product is magnesium citrate tetrahydrate [Mg(H₂O)₆] [MgC₆H₅O₇(H₂O)n]₂∙(8-2n)H₂O. The hydration process of HMC is controlled by the concentration of the C₆H₆O₇²⁻ ions. MgCl₂ could inhibit the ionization of HMC, thereby delaying the hydration progress of HMC. The second exothermic peak was delayed from 1 to 4.8 h with increased MgCl₂ content to 1.0 wt.%. The working performance of HMC-bonded castables could be improved by adding MgCl₂. After adding MgCl₂, the setting time, flow value, and cold modulus of rupture of HMC-bonded castables increased by 26.7%, 25.2%, and 8.8%, respectively, while the porosity decreased by 12%.

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水合柠檬酸镁的水化机理：MgCl2的影响

本研究通过观察水化温度、pH、电导率等动力学参数的变化，探讨水化柠檬酸镁（HMC）的水化机理。此外，还研究了MgCl2对HMC水化行为及其粘结浇注料工作性能的影响。结果表明：HMC的水化机制为溶解-沉淀，水化产物为四水合柠檬酸镁[Mg(H2O)6] [MgC6H5O7(H2O)n]2∙(8-2n)H2O；HMC的水化过程受C6H6O72−离子浓度的控制。MgCl2可以抑制HMC的电离，从而延缓HMC的水化进程。当MgCl2含量增加到1.0 wt.%时，第二个放热峰延迟了1 ~ 4.8 h。添加MgCl2可以改善hmc粘结浇注料的工作性能。添加MgCl2后，hmc粘结浇注料的凝固时间、流动值和断裂冷模量分别提高了26.7%、25.2%和8.8%，孔隙率降低了12%。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;