直吹管浇注料的损毁机理分析

Analysis of damage mechanism of blow pipe castable

针对首钢某高炉直吹管烧穿事故,重点考察了直吹管浇注料质量,进行了理化性能及抗渣试验分析。根据其使用环境,直吹管浇注料需具有耐高温、耐冲刷、保温和隔热的特点。采用铝酸盐水泥结合的莫来石质浇注料,中温强度降低,易产生结构剥落;抗渣性能较差,易受高炉渣侵蚀。因此,建议提高原材料的品质,降低杂质质量分数,减小尤其是碱金属对铝酸盐水泥的影响;添加红柱石或蓝晶石烧结剂,提高浇注料的中温强度和抗渣性,减小气孔率,从而大幅提高直吹管整体使用寿命。

Aiming at the burning accident of the blow pipe of a blast furnace in Shougang, the quality of blow pipe castable was investigated, and the physical and chemical properties and slag resistance test were analyzed. According to the operating environment, the blow pipe castables were required to have the characteristics of high temperature resistance, scouring resistance, thermal insulation and thermal insulation. Mullite castable with aluminate cement was used, in which the medium temperature strength was reduced and the structure is easy to spalling, and it was susceptible to blast furnace slag erosion because of the poor slag resistance. It is suggested to improve the quality of raw materials and reduce the mass fraction of impurities, especially the influence of alkali metals on aluminate cement, add andalusite or kyanite as sintering agent which could improve the medium temperature strength and slag resistance of the castable and reduce the porosity, and thus greatly improved the overall service life of the blow pipe.