高硅渣对不同废砖含量的镁钙耐火材料基质熔蚀行为  

Erosion Behavior of High-Silica Slag on MgO–CaO Based Refractories Containing Recycled Brick Materials

作　　者：李院高 宋金文 鄢文[2] 石会营 李凤友 裴强 LI Yuangao;SONG Jinwen;YAN Wen;SHI Huiying;LI Fengyou;PEI Qiang(Shanxi Luweibao Taigang Refractories Co.,Ltd.,Taiyuan 030100,China;The State Key Laboratory of Refractory and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]山西禄纬堡太钢耐火材料有限公司,太原030100 [2]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

出　　处：《硅酸盐学报》2025年第1期114-124,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(U21A2058)。

摘　　要：以镁钙耐火材料的基质部分为研究对象,采用35钙骨料、镁钙细粉和镁砂细粉为原料,向其中引入不同含量的回收废砖(0%~50%,质量分数),将其混合细磨后,制备了不同废砖加入量的镁钙耐火材料基质试样,并采用座滴法研究了高硅渣对不同废砖含量的镁钙耐火材料基质的熔蚀行为。结果表明:废砖的加入略微增大了高温液相量,促进了烧结过程,改变了气孔结构,进一步影响了镁钙耐火材料基质的抗渣熔蚀能力;当添加10%废砖时,试样气孔孔径最大(31.2μm),孔面积占比15.9%,接触角最小,试样被熔蚀最深,熔蚀层厚度为488μm,抗渣熔蚀性最差;随着废砖含量增大,略多的高温液相促进了基质烧结,使气孔面积减小,孔径更加均匀细小,这改善了基质的抗渣渗透性能,使熔蚀深度逐渐减小;当废砖含量为50%时,气孔孔径较小(24.6μm),孔面积占比9.7%,大幅提升了基质抗渣熔蚀性能,使熔蚀层厚度仅为275μm。最后,结合润湿角、熔蚀深度、气孔结构、MgO–CaO–SiO_(2)三元相图、熔蚀模型以及热力学模拟计算,提出了高硅渣对镁钙耐火材料基质部分的熔蚀行为与反应机理。Introduction MgO-CaO refractories exhibit superior characteristics such as high refractoriness,good thermodynamic stability,and superior slag resistance.They perform particularly well in steel purification and improving steel quality,playing an important role in high-temperature industries.However,utilizing used Mg O-Ca O refractories becomes a challenge as the use of these refractories expands.Effective recycling of used MgO-CaO refractories can mitigate environmental pollution,conserve valuable land resources,and lower energy costs and carbon emissions during raw material production.The high-value utilization of used MgO-CaO refractories is thus critical for sustainable development.The recycling of used MgO-CaO refractories has attracted recent attention.Some researchers regenerated MgO-CaO refractories using used MgO-CaO bricks,reporting that the regenerated bricks exhibited comparable physical properties to the original ones and showed an enhanced resistance to low-basicity slag.However,the effect of used brick incorporation on the slag resistance of MgO-CaO refractories are still lack,and the underlying mechanism remains unclear.The existing research on the slag-erosion mechanism of MgO-CaO refractories mainly involves static and dynamic slag resistance experiments or on-site industrial tests to analyze the original bricks.However,the random distribution of aggregates complicates the analysis of the effect of used refractory content on slag resistance,making it difficult to elucidate its impact on the refractory.In this study,six groups of MgO-CaO refractory matrix samples with different used brick contents(i.e.,0%–50%,in mass fraction)were prepared via mixing MgO-CaO aggregate,MgO-CaO powder,MgO powder,and used MgO-CaO bricks,and crushed into fine powders.This approach eliminated the influence of aggregate distribution and focused on the matrix portion of MgO-CaO refractories.The slag-erosion behavior of the matrix with different used brick contents was analyzed to clarify the impact mechanism of used bri

关 键 词：镁钙耐火材料 基质 再生利用 抗渣性能 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业]