| 基于水氯镁石合成水合硅酸镁及其在镁质浇注料的应用 |
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| 引用本文： | 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. |
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| 作者姓名： | 宋绍辉 李亚伟 廖宁 张思思 刘文静 李月英 铁生年 |
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| 作者单位： | 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 |
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| 基金项目： | 青海省自然科学基金面上项目(2022-ZJ-928) |
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| 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%。
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| 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 |
| 收稿时间： | 2022-09-28 |
Synthesis of Magnesium Silicate Hydrate Based on Bischofite and Its Application in Magnesia Castables |
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| 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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| Authors: | SONG Shaohui LI Yawei LIAO Ning ZHANG Sisi LIU Wenjing LI Yueying TIE Shengnian |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | bischofite magnesium silicate hydrate magnesia castable flexural strength microstructure |
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