矾土骨料对Al_2O_3-SiC-C铁沟浇注料性能的影响

Effects of bauxite aggregates on properties of Al_2O_3-SiC-C iron trough castables

为降低铁沟浇注料的原料成本,以粒度>1 mm的高铝矾土熟料GL-90和矾土均化料GL-88分别替代常规棕刚玉质Al2O3-SiC-C铁沟浇注料中>1 mm的棕刚玉颗粒,研究了这两种不同矾土骨料对铁沟浇注料的影响。结果表明:不同矾土骨料对铁沟浇注料的流动性、体积密度、强度以及抗渣侵蚀性均有不同程度的影响。相对矾土均化料而言,品位较高的高铝矾土熟料更适合作为铁沟浇注料中棕刚玉的替代品,以其为主要骨料制成的铁沟浇注料,其各项性能指标与以常规棕刚玉质铁沟浇注料的更为接近,而且在铁水温度不高、热冲击较小的中小型高炉上,这种铁沟浇注料与棕刚玉质铁沟浇注料的使用效果差别不大;而在铁水温度较高、热冲击大的高炉上,与棕刚玉质的使用效果差别较大,尤其是在撇渣器前端回旋区,应尽量使用棕刚玉质的铁沟浇注料。

Al2O3-SiC-C iron trough castables were prepared using high alumina bauxite clinker GL-90 （particle size 〉 1 mm） or homogenized bauxite GL-88 to replace the traditional brown corundum aggre- gates （ 〉 1 mm） to reduce the cost of iron trough castables. Effects of the two bauxite aggregates on properties of iron trough castables were investigated. The results show that the two bauxites affect flowability, bulk density,strength and slag corrosion resistance of trough castables differently. Compared with homogenized bauxite,high alumina bauxite clinker is more suitable to substitute brown corundum. The castables prepared from the bauxite clinker have a similar performance with those prepared from brown corundum, especially used in medium or small blast furnaces with weak thermal impact and lower temperature of melt- ing iron. However, in large blast furnaces with severe thermal impact and high temperature of melting iron, the performances of the two castables are significantly different. So it is suggested to use the brown corun- dum based castables in the front gyral zone of the slag skimmer.