关键词: 再生料, Al₂O₃-SiC-C浇注料, 抗热震性, 抗渣侵蚀性

Abstract: The short service life of the currently used slide gates leads to significant waste of high-quality raw materials.Recycling spent slide gate materials into appropriate refractories can reduce costs and achieve comparable performance.In this work,Al₂O₃-SiC-C (ASC) castables were prepared using bauxite,the recycled alumina-carbon composite slide gate materials (abbreviated as “recycled material” hereinafter) and SiC as aggregates,and white corundum powder,SiO₂ micropowder,Si powder,α-Al₂O₃ micropowder,Secar 71 cement and spherical asphalt as fine powders.The performance of the recycled materials and the influence of the recycled materials addition to substitute for the bauxite (0,6%,12%,18%,and 24%,by mass) on the properties of the ASC castables were investigated.The results show that:(1)the recycled material has similar Al₂O₃ content to bauxite,containing graphite,Al,and Si,and slightly lower bulk density;(2)the introduction of the recycled material promotes the generation of SiC whiskers in the ASC castables,improving the cold strength and thermal shock resistance;(3)the recycled material exhibits higher reactivity,which can enhance the bonding with the matrix through reactive sintering,hinder further slag penetration and improve the slag corrosion resistance of the ASC castables;the ASC castables with 24% recycled material meet the performance requirements for the iron trough.

Key words: recycled material, Al₂O₃-SiC-C castables, thermal shock resistance, slag corrosion resistance