利用中烧镁砂制备MgO-Mg2SiO4质耐火材料及抗热震性能研究

doi:10.3969/j.issn.1001-1935.2025.06.005

耐火材料 ›› 2025, Vol. 59 ›› Issue (6): 482-487.DOI: 10.3969/j.issn.1001-1935.2025.06.005

利用中烧镁砂制备MgO-Mg₂SiO₄质耐火材料及抗热震性能研究

王采燃¹⁾, 侯庆冬¹⁾, 于佳瑶²⁾, 高慧楠³⁾, 边作民³⁾, 罗旭东^1,4), 何鑫叶⁵⁾, 李一涵⁵⁾

1)辽宁科技大学材料与冶金学院辽宁鞍山 114051
2)鞍钢集团钢铁研究院辽宁鞍山 114003
3)鞍山钢铁集团耐火材料有限公司辽宁鞍山 114000
4)辽宁科技学院辽宁本溪 117000
5)辽宁铭轩新材料科技有限公司辽宁鞍山 114200

收稿日期:2025-03-14 出版日期:2025-12-15 发布日期:2025-12-23
通讯作者: 侯庆冬,男,1994年生,博士,讲师。E-mail:houqingdongs@163.com
作者简介:王采燃:女,2000年生,硕士研究生。E-mail:2210316674@qq.com
基金资助:
辽宁省高校基本科研项目(LJ212510146021)。

Preparation of MgO-Mg₂SiO₄ refractories from light burnt magnesia and their thermal shock resistance

Wang Cairan, Hou Qingdong, Yu Jiayao, Gao Huinan, Bian Zuomin, Luo Xudong, He Xinye, Li Yihan

First author’s address:School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China

Received:2025-03-14 Online:2025-12-15 Published:2025-12-23

摘要/Abstract

摘要： 为了解决菱镁矿尾矿资源浪费及环境污染问题,选用菱镁矿尾矿制备的中烧镁砂为原料,以SiO₂和Ca(OH)₂为添加剂,经1 450 ℃保温3 h制备MgO-Mg₂SiO₄质耐火材料,研究了SiO₂和Ca(OH)₂对MgO-Mg₂SiO₄质耐火材料烧结性能及抗热震性能的影响。结果表明,SiO₂和Ca(OH)₂的引入共同促进了材料的烧结,当SiO₂添加量为1.96%(w),Ca(OH)₂添加量为2.42%(w),即添加剂Ca(OH)₂、SiO₂物质的量比为1时,试样的烧结性能与抗热震性能最佳,此时试样的体积密度和显气孔率分别为2.96 g·cm^-3和16.7%,其热震后的抗折强度保持率与耐压强度保持率分别为80%和53%。SiO₂和Ca(OH)₂的引入也会促进钙镁橄榄石和镁橄榄石发生固溶反应,使材料晶界上出现微裂纹,应力作用下裂纹扩展并发生方向偏转,起到裂纹偏转增韧的效果,从而改善了MgO-Mg₂SiO₄质耐火材料的抗热震性能。

关键词: 中烧镁砂, MgO-Mg₂SiO₄质耐火材料, 烧结性能, 抗热震性能

Abstract: To solve the problems of wasting magnesite tailings resource and environmental pollution,medium burned magnesia prepared from magnesite tailings was selected as the raw material,adding SiO₂ and Ca(OH)₂ as additives to prepare MgO-Mg₂SiO₄ refractories at 1 450 ℃ for 3 h.The effects of SiO₂ and Ca(OH)₂ additions on the sintering and thermal shock resistance of the refractories were studied.The results show that the introduction of SiO₂ and Ca(OH)₂ jointly promotes the sintering of the material.When the additions of SiO₂ and Ca(OH)₂ are 1.96 mass% and 2.42 mass%,namely the molar ratio of Ca(OH)₂ to SiO₂ is 1,the sintering and thermal shock resistance of the sample are the optimal:the bulk density is 2.96 g·cm^-3,the apparent porosity is 16.7%,the retention ratios of the cold modulus of rupture and cold compressive strength after thermal shock are 80% and 53%,respectively.The introduction of SiO₂ and Ca(OH)₂ also promotes the solid solution reaction between monticellite and forsterite,thus forming microcracks at the grain boundaries of the material.The cracks propagate and undergo deflection under stress,which plays a role in crack deflection toughening,thereby improving the thermal shock resistance of MgO-Mg₂SiO₄ refractories.

Key words: medium burned magnesia, MgO-Mg₂SiO₄ refractories, sintering performance, thermal shock resistance

中图分类号:

TQ175

王采燃, 侯庆冬, 于佳瑶, 高慧楠, 边作民, 罗旭东, 何鑫叶, 李一涵. 利用中烧镁砂制备MgO-Mg₂SiO₄质耐火材料及抗热震性能研究[J]. 耐火材料, 2025, 59(6): 482-487.

Wang Cairan, Hou Qingdong, Yu Jiayao, Gao Huinan, Bian Zuomin, Luo Xudong, He Xinye, Li Yihan. Preparation of MgO-Mg₂SiO₄ refractories from light burnt magnesia and their thermal shock resistance[J]. Refractories, 2025, 59(6): 482-487.

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利用中烧镁砂制备MgO-Mg₂SiO₄质耐火材料及抗热震性能研究

Preparation of MgO-Mg₂SiO₄ refractories from light burnt magnesia and their thermal shock resistance

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