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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1749-1756.DOI: 10.16552/j.cnki.issn1001-1625.2025.1035

• 耐火材料 • 上一篇    下一篇

复掺铝和硅对镁碳质供气元件物相重构及抗渣侵蚀性能的影响

闫明伟1,2(), 张伦梁1, 孙广超1, 叶树峰1, 刘开琪1()   

  1. 1.中国科学院过程工程研究所,北京 100190
    2.珠海亿特立新材料有限公司,珠海 519085
  • 收稿日期:2025-10-27 修订日期:2025-12-06 出版日期:2026-05-15 发布日期:2026-06-10
  • 通信作者: 刘开琪,博士,研究员。E-mail:kqliu@ipe.ac.cn
  • 作者简介:闫明伟(1989—),男,博士,工程师。主要从事高温结构材料与陶瓷金属复合材料方向的研究。E-mail:1287552447@qq.com
  • 基金资助:
    中国科学院化工冶金低碳变革技术及示范战略性先导科技专项资助(XDA0390102);介科学与工程全国重点实验室资助(MESO-23-A07)

Effect of Double-Doping Al and Si on Phase Reconstruction and Slag Erosion Resistance of Magnesia-Carbon Bottom-Blowing Elements

YAN Mingwei1,2(), ZHANG Lunliang1, SUN Guangchao1, YE Shufeng1, LIU Kaiqi1()   

  1. 1.Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China
    2.Zhuhai Yiteli New Materials Co.,Ltd.,Zhuhai 519085,China
  • Received:2025-10-27 Revised:2025-12-06 Published:2026-05-15 Online:2026-06-10

摘要:

冶金炉底吹用镁碳质供气元件通常添加Al或Si提升使用性能。为探究在高温氮气环境下复掺Al和Si对供气元件物相重构及抗渣侵蚀性能的影响,以电熔镁砂、鳞片石墨、Al粉和Si粉为原料制备了供气元件试样;经1 600 ℃氮气热处理试样后,借助XRD、SEM和EDS分别研究了单掺Al及复掺Al和Si试样基质的物相重构及渣侵蚀界面微结构。结果表明,与单掺Al不同,复掺Al和Si试样的基质呈现出不同的物相演变,且复掺Al和Si对试样抗渣侵蚀性能有着重要影响。经1 600 ℃渣侵蚀20 min后,单掺Al的试样与转炉渣的接触面未表现出明显的挂渣现象,试样的氧化侵蚀层厚度不足1 000 μm;复掺Si和Al制备的试样表面则形成了约300 μm厚且由镁铝尖晶石、Ca3(Al1-x Fe x2Si3O12和12CaO?7Al2O3构成的氧化侵蚀层。这展现出Si对镁碳质供气元件的物相重构及抗渣侵蚀性能有着很大影响,需控制添加量,不宜过多。

关键词: 镁碳质供气元件, 底吹, 复掺Al和Si, 物相重构, 抗渣侵蚀性能

Abstract:

Magnesia-carbon bottom-blowing element for metallurgical furnace is typically enhanced by adding Al or Si to improve its performance. To investigate the effect of double-doping Al and Si on phase reconstruction and slag erosion resistance at high-temperature nitrogen environment, the magnesia-carbon bottom-blowing element specimens were prepared using fused magnesia, flake graphite, Al powder, and Si powder. The specimens were heat-treated in a 1 600 ℃ nitrogen atmosphere, and XRD, SEM, and EDS were employed to analyze the phase reconstruction and microstructure of the matrix of the Al single-doped and Al-Si double-doped specimens before and after erosion by slag. Results indicate that different from the Al single-doped specimen, the Al-Si double-doped specimen induces distinct phase transformations in the matrix, and double-doping Al and Si has an important effect on the slag erosion resistance. After the slag erosion experiment at 1 600 ℃ for 20 min, the Al single-doped specimen shows no significant slag adhesion on its contact surface with converter slag, with oxidation erosion layer less than 1 000 μm. In contrast, the Al-Si double-doped specimen develops a 300 μm oxidation erosion layer composed of spinel, Ca3(Al1-x Fe x2Si3O12, and 12CaO·7Al2O3, demonstrating that Si significantly influences phase reconstruction and slag erosion resistance of magnesia-carbon bottom-blowing elements and its excessive addition should be avoided.

Key words: magnesia-carbon bottom-blowing element, bottom blowing, double-doping Al and Si, phase reconstruction, slag erosion resistance

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