基于水氯镁石合成水合硅酸镁及其在镁质浇注料的应用

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (2): 751-760.

所属专题：耐火材料

基于水氯镁石合成水合硅酸镁及其在镁质浇注料的应用

宋绍辉^1,2, 李亚伟^1,2,3, 廖宁^1,2, 张思思^1,2, 刘文静^1,2, 李月英³, 铁生年³

1.武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉 430081;
2.武汉科技大学高温材料与炉衬技术国家地方联合工程研究中心,武汉 430081;
3.青海大学,青海省先进材料与应用技术重点实验室,西宁 810016

收稿日期:2022-09-28 修订日期:2022-10-20 出版日期:2023-02-15 发布日期:2023-03-07
通信作者: 李亚伟,博士,教授。E-mail:liyawei@wust.edu.cn
作者简介:宋绍辉(1994—),男,硕士研究生。主要从事耐火材料的研究。E-mail:453017507@qq.com
基金资助:
青海省自然科学基金面上项目(2022-ZJ-928)

Synthesis of Magnesium Silicate Hydrate Based on Bischofite and Its Application in Magnesia Castables

SONG Shaohui^1,2, LI Yawei^1,2,3, LIAO Ning^1,2, ZHANG Sisi^1,2, LIU Wenjing^1,2, LI Yueying³, TIE Shengnian³

1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
2. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;
3. Key Laboratory of Advanced Materials and Applied Technology for Qinghai, Qinghai University, Xining 810016, China

Received:2022-09-28 Revised:2022-10-20 Online:2023-02-15 Published:2023-03-07

摘要/Abstract

摘要： 水氯镁石是一种非常具有应用前景的镁盐资源,其储量丰富,成本低廉。以青海盐湖水氯镁石和水玻璃合成不同MgO/SiO₂摩尔比(0.5:1,1:1,1.5:1)的水合硅酸镁(M-S-H)凝胶,采用XRD、SEM、红外和核磁共振等测试手段研究M-S-H的合成机理和结构特征,进而将合成的M-S-H与硅微粉复合制备镁质浇注料,探究M-S-H结构对浇注料结合特性的影响规律。结果表明:不同MgO/SiO₂摩尔比的M-S-H呈层状堆叠结构,MgO/SiO₂摩尔比为1:1时M-S-H的层间自由水少,结晶度最高;M-S-H替代部分硅微粉制备镁质浇注料能显著提高1 550 ℃热处理后浇注料的力学性能,其中MgO/SiO₂摩尔比为1:1的M-S-H复合硅微粉制备的镁质浇注料综合性能最佳,与添加6%(质量分数)硅微粉制备的镁质浇注料相比,其常温抗折强度和高温抗折强度分别提高75%和8%。

关键词: 水氯镁石, 水合硅酸镁, 镁质浇注料, 抗折强度, 微观结构

Abstract: Bischofite is a very promising magnesium salt resource with abundant reserves and low cost. Magnesium silicate hydrate (M-S-H) gels with different MgO/SiO₂ molar ratios (0.5:1, 1:1, 1.5:1) were synthesized using bischofite from Qinghai Salt Lake and sodium silicate. The synthesis mechanism and structural characteristics of M-S-H were studied by XRD, SEM, infrared, and nuclear magnetic resonance tests. Then, the synthesized M-S-H was compounded with microsilica to prepare magnesia castable, and the influence of M-S-H structure on the bonding characteristics of castable was explored. The results show that M-S-H obtained from different MgO/SiO₂ molar ratios exhibits a layered stacking structure. When the MgO/SiO₂ molar ratio is 1:1, the interlaminar free water is the least and the crystallinity is the highest. The synthesized M-S-H is used to replace part of microsilica to prepare magnesia castable, which significantly improves the mechanical properties of the castable after heat treatment at 1 550 ℃. The magnesia castable prepared with M-S-H (MgO/SiO₂ molar ratio of 1:1) and microsilica obtains the best comprehensive properties. Compared with the magnesia castable prepared by adding 6% (mass fraction) microsilica, the flexural strength at room temperature and high temperature increases by 75% and 8%, respectively.

Key words: bischofite, magnesium silicate hydrate, magnesia castable, flexural strength, microstructure

中图分类号:

TQ175

宋绍辉, 李亚伟, 廖宁, 张思思, 刘文静, 李月英, 铁生年. 基于水氯镁石合成水合硅酸镁及其在镁质浇注料的应用[J]. 硅酸盐通报, 2023, 42(2): 751-760.

SONG Shaohui, LI Yawei, LIAO Ning, ZHANG Sisi, LIU Wenjing, LI Yueying, TIE Shengnian. Synthesis of Magnesium Silicate Hydrate Based on Bischofite and Its Application in Magnesia Castables[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(2): 751-760.

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基于水氯镁石合成水合硅酸镁及其在镁质浇注料的应用

Synthesis of Magnesium Silicate Hydrate Based on Bischofite and Its Application in Magnesia Castables

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