纳米Cr2O3对MgO-CaO材料抗低碱度渣侵蚀影响研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (12): 4620-4628.

纳米Cr₂O₃对MgO-CaO材料抗低碱度渣侵蚀影响研究

李佳¹, 栾舰¹, 潘波², 王树山², 王春艳¹, 臧伟楠¹, 秦嘉晨¹

1.辽宁科技大学材料与冶金学院, 辽宁 114044;
2.辽宁中镁高温材料有限公司, 辽宁 115100

收稿日期:2024-06-24 修订日期:2024-07-29 出版日期:2024-12-15 发布日期:2024-12-19
通信作者: 栾舰,副教授。E-mail:jianluan@126.com
作者简介:李佳(1999—),女,硕士研究生。主要从事冶金新技术耐火材料的研究。E-mail:1512410460@qq.com
基金资助:
2023年辽宁省“揭榜挂帅”科技计划项目(2023JH1/10400010)

Effect of Nano-Cr₂O₃ on Corrosion Resistance of MgO-CaO Material to Low Basicity Slag

LI Jia¹, LUAN Jian¹, PAN Bo², WANG Shushan², WANG Chunyan¹, ZANG Weinan¹, QIN Jiachen¹

1. College of Materials and Metallurgy, University of Science and Technology Liaoning, Liaoning 114044, China;
2. Liaoning Medium Magnesium High Temperature Material Co.,Ltd., Liaoning 115100, China

Received:2024-06-24 Revised:2024-07-29 Published:2024-12-15 Online:2024-12-19

摘要/Abstract

摘要： 镁钙系耐火材料因具有耐火度高、热力学性质稳定、能净化钢液等优良性质,被认为是炉外精炼设备的理想炉衬材料,但在实际冶炼过程中因长期受低碱度渣侵蚀,熔损严重。为提高MgO-CaO体系抗低碱度渣侵蚀,本文以轻烧白云石粉和轻烧氧化镁粉为主要原料,添加不同含量的纳米Cr₂O₃(0.5%、1.0%、1.5%、2.0%、2.5%和3.0%,质量分数),经混合、成型后于1 650 ℃×3 h烧成,进行低碱度渣(m(CaO) ∶m(SiO₂)=1 ∶1)侵蚀试验,采用XRD表征烧后试样的物相组成和SEM表征侵蚀后试样的显微结构。结果表明:少量纳米Cr₂O₃的加入会固溶到CaO和MgO晶粒中引起晶格畸变,促进烧结,当纳米Cr₂O₃的加入量超过2.5%时,纳米Cr₂O₃会与CaO和MgO生成CaCr₂O₄和MgCr₂O₄,填充在晶粒的晶界等部位,改变试样的显微结构,显著提升其抗侵蚀性能。

关键词: 纳米Cr₂O₃, MgO-CaO材料, 抗侵蚀性, 显微结构, 物相组成, 低碱度渣

Abstract: Magnesium-calcium refractory is considered to be an ideal lining material for off-furnace refining equipment due to its high refractoriness, stable thermodynamic properties, and purification of molten steel. However, in the actual smelting process, it has been eroded by low basicity slag for a long time, and the melting loss is serious. Therefore, in order to improve the corrosion resistance of MgO-CaO system to low basicity slag. In this paper, light-burned dolomite powder and light-burned magnesium oxide powder were used as the main raw materials, and different amounts of nano-Cr₂O₃ (0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0%,mass fraction) were added. After mixing, molding and firing at 1 650 ℃×3 h, the erosion experiment of low basicity slag (m(CaO) ∶m(SiO₂)=1 ∶1) was carried out. The phase composition and microstructure of the samples after erosion were analyzed by XRD and SEM. The results show that the addition of a small amount of nano-Cr₂O₃ will dissolve into CaO and MgO grains, causing lattice distortion and promoting sintering. When the addition of nano-Cr₂O₃ exceeds 2.5%, nano-Cr₂O₃ will react with CaO and MgO to form CaCr₂O₄ and MgCr₂O₄, which are filled in the grain boundaries and other parts of the grains. The microstructure of the sample is changed, and the corrosion resistance of the sample is significantly improved.

Key words: nano-Cr₂O₃, MgO-CaO material, corrosion resistance, microstructure, phase composition, low basicity slag

中图分类号:

TQ175

李佳, 栾舰, 潘波, 王树山, 王春艳, 臧伟楠, 秦嘉晨. 纳米Cr₂O₃对MgO-CaO材料抗低碱度渣侵蚀影响研究[J]. 硅酸盐通报, 2024, 43(12): 4620-4628.

LI Jia, LUAN Jian, PAN Bo, WANG Shushan, WANG Chunyan, ZANG Weinan, QIN Jiachen. Effect of Nano-Cr₂O₃ on Corrosion Resistance of MgO-CaO Material to Low Basicity Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4620-4628.

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纳米Cr₂O₃对MgO-CaO材料抗低碱度渣侵蚀影响研究

Effect of Nano-Cr₂O₃ on Corrosion Resistance of MgO-CaO Material to Low Basicity Slag

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