轻量刚玉骨料对钢包包底冲击区用铝镁碳耐火材料侵蚀机理的影响  

Effects of Lightweight Alumina Aggregates on Erosion Mechanisms of Alumina Magnesia Carbon Refractories Used for Impact Zone of Steel Ladle Bottoms

作　　者：高杰 陈启龙 刘诚 李天清 冯润棠 左起秀 GAO Jie;CHEN Qilong;LIU Cheng;LI Tianqing;FENG Runtang;ZUO Qixiu(Puyang Refractories Group Co.,Ltd.,Puyang 457100,China;Shanghai Baoming Refractories Co.,Ltd.,Shanghai 200400,China)

机构地区：[1]濮阳濮耐高温材料(集团)股份有限公司,濮阳457100 [2]上海宝明耐火材料有限公司,上海200400

出　　处：《硅酸盐通报》2024年第11期4224-4231,共8页Bulletin of the Chinese Ceramic Society

摘　　要：钢包用耐火材料的轻量化对节能降耗和减少吨钢耐材消耗意义重大。本文研究了含轻量刚玉骨料铝镁碳耐火材料在170 t钢包包底冲击区服役的侵蚀机理,并与传统致密烧结刚玉基铝镁碳耐火材料进行了对比分析。结果表明,采用轻量刚玉骨料制备的铝镁碳耐火材料显示更优异的使用效果,侵蚀速率由原先的1.79 mm/炉降低至1.35 mm/炉,服役寿命提升近24.6%。研究表明:轻量刚玉骨料具有高的表面粗糙度和丰富的微米级气孔,不仅能强化骨料基质结合界面,还可以通过微孔吸收热应力,显著提高了铝镁碳耐火材料的抗冲刷性能和热震稳定性;同时能促进热面生成致密且较厚的六铝酸钙-尖晶石复合隔离层,阻碍了熔渣的侵蚀与渗透,并有效抑制了内部碳的氧化。另外,轻量刚玉骨料能吸附熔渣并形成核壳结构,进一步提升材料的抗侵蚀性。The lightweight of refractories used for steel ladles is of great significance for energy saving and reduction of the specific refractory consumption per ton of steel.In this paper,the erosion mechanisms of alumina magnesia carbon refractories containing lightweight alumina aggregates in the impact zone of 170 t steel ladle bottom were investigated,and the comparison with traditional dense alumina magnesia carbon refractories was analyzed.The results show that the alumina magnesia carbon refractories using lightweight alumina aggregates exhibit a better application effect.The wear rate decreases from the original 1.79 mm/heat to 1.35 mm/heat,and the service life increases by nearly 24.6%.It is found that the introduction of lightweight alumina aggregates with high surface roughness and abundant micro-sized pores can not only strengthen the bonding interface between aggregates and matrix,but also absorb the thermal stress through pores,which contributes to the improved erosion resistance and thermal shock resistance of alumina magnesia carbon refractories.It also promotes the formation of a thick dense calcium hexaluminate and MgAl 2O 4 spinel composite isolation layer at the hot face,which impedes the slag corrosion and penetration as well as oxidation of carbon.In addition,slag can be absorbed by the lightweight alumina aggregates and a special core-shell structure formed,and thus better slag corrosion resistance is obtained.

关 键 词：铝镁碳耐火材料 包底冲击区 钢包 轻量化 刚玉骨料 侵蚀机理 

分 类 号：TQ175[化学工程—硅酸盐工业]