关键词: 用后铁沟料, Al₂O₃-SiC-C浇注料, 加水量, 物理性能

Abstract: To improve the resource recycling rate of spent refractories,Al₂O₃-SiC-C castables were prepared using brown corundum,spent iron trough castables,white corundum,silicon carbide,α-Al₂O₃ micropowder and silica micropowder as the main raw materials.The effects of the spent iron trough castable addition (0,14%,28%,42% and 56%,by mass) on the performance of the castables were explored.The results show that with the increase of the spent iron trough castable addition,the water demand of the castables significantly increases;the samples change from expansion to shrinkage after heat-treatment at 1 450 ℃ for 3 h;the bulk density,cold modulus of rupture and corrosion resistance of the samples after heat-treatment at 110 ℃ for 24 h and 1 450 ℃ for 3 h all show downward trends;however,when the spent iron trough castable addition is lower than 28%,the performance degradation is relatively smaller.The castables with 28% spent iron trough castables were served for the iron runner and slag runner of the iron trough of 1 080 and 1 350 m³ blast furnaces,achieving a good service effect with the service life of the main structure more than 70 days.

Key words: spent iron trough castables, alumina-silicon carbide-carbon castables, water demand, physical properties