水泥结合骨料-基质协同低导莫来石浇注料性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 4232-4239.

水泥结合骨料-基质协同低导莫来石浇注料性能研究

李亚伟^1,2, 宋绍辉², 廖宁², 柯文丽², 刘文静², 铁生年¹, 柳馨¹

1.青海大学青海省先进材料与应用技术重点实验室和能源与电气工程学院,西宁 810016;
2.武汉科技大学钢铁工业耐火材料新技术国际合作联合实验室,武汉 430081

收稿日期:2024-04-26 修订日期:2024-07-03 出版日期:2024-11-15 发布日期:2024-11-21
通信作者: 廖宁,博士,副教授。E-mail:liaoning@wust.edu.cn
作者简介:李亚伟(1966—),男,博士,教授。主要从事耐火材料的研究。E-mail:liyawei@wust.edu.cn
基金资助:
青海省自然科学基金面上项目(2022-ZJ-928)

Properties of Cement-Bonded Aggregate and Matrix Synergistic Low-Conductivity Mullite Castable

LI Yawei^1,2, SONG Shaohui², LIAO Ning², KE Wenli², LIU Wenjing², TIE Shengnian¹, LIU Xin¹

1. Key Laboratory of Advanced Materials and Application Technology in Qinghai Province and College of Energy and Electrical Engineering, Qinghai University, Xining 810016, China;
2. Joint International Research Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Received:2024-04-26 Revised:2024-07-03 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 针对高温工业炉的节能降耗和安全长寿服役要求,进一步降低炉衬耐火材料的导热系数和保障服役性能是当前的研究热点。本文选择水泥结合莫来石质浇注料为研究对象,提出利用高比表面积水合硅酸镁(M-S-H)调控铝酸钙水泥的水化行为,提高浇注料早期结合强度的思路,通过采用轻质莫来石化骨料和在基质中引入引气剂的方式协同降低导热系数。研究发现,高比表面积M-S-H有利于促进水泥水化形成针柱状十水铝钙(CAH₁₀),大幅提高浇注料结合强度。在轻量化莫来石骨料制备浇注料中引入M-S-H和0.01%(质量分数)引气剂时,1 250 ℃热处理后材料中1~100 μm的孔隙显著增加,1 000 ℃时导热系数仅为0.599 W·(m·K)^-1,较致密浇注料降低18.9%。

关键词: 莫来石质浇注料, 水合硅酸镁, 轻质莫来石骨料, 引气剂, 导热系数

Abstract: Given the imperative of energy conservation, safety, and durability in high-temperature industrial furnaces, current research focuses on reducing the thermal conductivity of refractories used in furnace linings while ensuring optimal performance. The research subject of this study was cement-bonded mullite castable. Firstly, the hydration behavior of calcium aluminate cement was regulated by incorporating magnesium silicate hydrate (M-S-H) with a high specific surface area to enhance bonding strength. Additionally, thermal conductivity was cooperatively reduced by lightweight mullite aggregate and introducing air-entraining agent in the matrix. The results indicate that M-S-H with a high specific surface area provides more nucleation sites for hydration products, thereby facilitating the formation of pin CAH₁₀ during cement hydration and improving castable bonding strength. Furthermore, through the incorporation of M-S-H and 0.01% (mass fraction) air-entraining agent in castables with lightweight mullite aggregate, the pore within 1~100 μm significantly increases after heat treatment at 1 250 ℃. Moreover, at 1 000 ℃, the thermal conductivity is only 0.599 W·(m·K)^-1, which is 18.9% lower than that observed in traditional castables.

Key words: mullite castable, magnesium silicate hydrate, lightweight mullite aggregate, air-entraining agent, thermal conductivity

中图分类号:

TQ175

李亚伟, 宋绍辉, 廖宁, 柯文丽, 刘文静, 铁生年, 柳馨. 水泥结合骨料-基质协同低导莫来石浇注料性能研究[J]. 硅酸盐通报, 2024, 43(11): 4232-4239.

LI Yawei, SONG Shaohui, LIAO Ning, KE Wenli, LIU Wenjing, TIE Shengnian, LIU Xin. Properties of Cement-Bonded Aggregate and Matrix Synergistic Low-Conductivity Mullite Castable[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4232-4239.

参考文献

[1] 王战民, 曹喜营, 吴吉光, 等. 钢铁工业用耐火材料新技术进展[J]. 耐火材料, 2023, 57(5): 377-385.
WANG Z M, CAO X Y, WU J G, et al. New technology progress of refractories for iron and steel industry[J]. Refractories, 2023, 57(5): 377-385 (in Chinese).
[2] 李红霞. 先进耐火材料创新助推国家战略实施[J]. 耐火材料, 2023, 57(5): 369-376.
LI H X. Advanced refractories innovation boosts China's strategy implementation[J]. Refractories, 2023, 57(5): 369-376 (in Chinese).
[3] ZHANG Q C, CHEN L Y, MA X G, et al. Numerical study of combustion and air supply characteristics and structural optimization of top combustion hot blast stoves[J]. ISIJ International, 2021, 61(1): 62-70.
[4] 孙鹏鹏. 冶金加热炉热源的热经济分析[J]. 山西冶金, 2022, 45(8): 183-184.
SUN P P. Thermal economic analysis of heat source of metallurgical heating furnace[J]. Shanxi Metallurgy, 2022, 45(8): 183-184 (in Chinese).
[5] ZHAO J, MA L, ZAYED M E, et al. Industrial reheating furnaces: a review of energy efficiency assessments, waste heat recovery potentials, heating process characteristics and perspectives for steel industry[J]. Process Safety and Environmental Protection, 2021, 147: 1209-1228.
[6] 孙少华, 刘杨, 张海生, 等. 轧钢加热炉节能减排环保新技术研究探讨[J]. 金属世界, 2023(3): 16-19.
SUN S H, LIU Y, ZHANG H S, et al. Research and discussion on new technology of energy saving, emission reduction and environmental protection for steel rolling reheating furnace[J]. Metal World, 2023(3): 16-19 (in Chinese).
[7] SADIK C, EL AMRANI I E, ALBIZANE A. Recent advances in silica-alumina refractory: a review[J]. Journal of Asian Ceramic Societies, 2014, 2(2): 83-96.
[8] YIN H, DANG J, XIN Y, et al. Research status and development trend of lightweight refractories[J]. Material guide, 2018, 32(8): 2618-2625.
[9] 罗志勇, 刘开琪, 王秉军, 等. 高铝轻质骨料对高速连铸中间包永久衬浇注料性能的影响[C]//耐火材料综合学术年会暨全国不定形耐火材料学术会议, 耐火原料学术交流会. 中国金属学会, 2015: 102-104.
LUO Z Y, LIU K Q, WANG B J, et al. Effect of high aluminum lightweight Aggregate on the performance of permanent lining castable for high-speed continuous casting intermediate ladle[C]//Refractory Comprehensive Academic Annual Meeting and National Amorphous Refractory Academic Conference, Refractory Raw Materials Academic Exchange Meeting. Chinese Society for Metals, 2015: 102-104 (in Chinese).
[10] 刘光平, 李媛媛, 朱冬冬, 等. 莫来石骨料对高强度轻质隔热浇注料性能的影响[C]//2021年全国耐火原料学术交流会论文集. 洛阳: 耐火材料杂志社, 2021: 1-6.
LIU G P, LI Y Y, ZHU D D, et al. Influence of mullite aggregate on performance of high-strength lightweight thermal insulation castable[C]//Proceedings of the 2021 National Academic Exchange on Refractory Materials. Luoyang: Refractory Magazine, 2021: 1-6 (in Chinese).
[11] 郭文辉. 莫来石—堇青石质浇注料的轻量化研究[D]. 洛阳: 中钢集团洛阳耐火材料研究院有限公司, 2022.
GUO W H. Study on lightweight of mullite-cordierite castable[D]. Luoyang: Luoyang Refractory Research Institute Co., Ltd., 2022 (in Chinese).
[12] 徐德亭, 黄江文, 石凯, 等. 高性能轻质高铝浇注料的研制[J]. 工业炉, 2018, 40(6): 67-70.
XU D T, HUANG J W, SHI K, et al. Development of high performance lightweight alumina castable[J]. Industrial Furnace, 2018, 40(6): 67-70 (in Chinese).
[13] 宋绍辉, 李亚伟, 廖宁, 等. 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 S H, LI Y W, LIAO N, et al. 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 (in Chinese).
[14] SONG Q, HU Y, WANG Q, et al. Effect of MgO reactivity and curing temperature on properties of MgO-SiO₂-H₂O system[J]. Journal of the Chinese Ceramic Society, 2019.
[15] NIED D, ENEMARK-RASMUSSEN K, L'HOPITAL E, et al. Properties of magnesium silicate hydrates (M-S-H)[J]. Cement and Concrete Research, 2016, 79: 323-332.
[16] NAWAZ A, KIM N, SEO J, et al. Hydration and phase conversion of MgO-modified calcium aluminate cement[J]. Construction and Building Materials, 2023, 369: 130425.
[17] ZHOU W Y, ZHANG Z, LI N, et al. A new mullite foamed ceramic prepared by direct-foaming methods in parallel with a mechanical activation technique[J]. Ceramics International, 2022, 48(14): 20721-20730.
[18] 李亚伟, 廖宁, 刘文静, 等. 基于水合硅酸镁结构记忆特性制备低硅镁质浇注料[J]. 硅酸盐学报, 2023, 51(3): 649-657.
LI Y W, LIAO N, LIU W J, et al. Effect of magnesium silicate hydrate on properties of low-microsilica bonded magnesia-based castables[J]. Journal of the Chinese Ceramic Society, 2023, 51(3): 649-657 (in Chinese).
[19] LIU W J, LIAO N, NATH M, et al. Effects of curing time on the pore structure evolution and fracture behavior of CAC bonded alumina-spinel castables[J]. Ceramics International, 2022, 48(17): 25000-25010.
[20] 麦海香, 赵飞, 安建成, 等. 热处理温度对矾土基莫来石材料结构及晶体生长的影响[J]. 耐火材料, 2023, 57(4): 314-319.
MAI H X, ZHAO F, AN J C, et al. Effect of heat-treatment temperature on crystal growth and structure of bauxite based mullite materials[J]. Refractories, 2023, 57(4): 314-319 (in Chinese).