关键词: 钛铁渣, 矾土熟料, Al₂O₃-SiC-C浇注料, 抗氧化性, 抗热震性

Abstract: To alleviate the resource shortage and rationally utilize ferrotitanium slag,Al₂O₃-SiC-C castables were prepared with bauxite clinker,dense corundum,silicon carbide,α-Al₂O₃ micropowder,silica micropowder,and silicon powder as main raw materials,heat treating at 1 450 ℃ for 3 h.Ferrotitanium slag was added to replace bauxite clinker in equal amount with the mass fraction of 0,11.2%,22.4%,33.6%,44.8% and 56%,respectively.The effect of the ferrotitanium slag addition on the properties of the castables was researched.The results show that with the increase of the ferrotitanium slag addition,the bulk density of the castables decreases,the apparent porosity increases,and the cold strength decreases,but the hot modulus of rupture and thermal shock resistance are improved to some extent.The addition of ferrotitanium slag generates many pores to provide more channels for the diffusion of oxygen,and the impurities introduced by ferrotitanium slag after oxidation treatment generate more liquid phases,which loosen the castable structure and significantly reduce the oxidation resistance.The reaction of ferrotitanium slag with molten slag produces magnesium aluminate spinel,thus preventing the further corrosion of slag and enhancing the corrosion resistance of the castables.Generally,the optimal addition of ferrotitanium slag is 56%.

Key words: ferrotitanium slag, bauxite clinker, alumina-silicon carbide-carbon castables, oxidation resistance, thermal shock resistance