Development of Magnesium Aluminate Spinel Castable for Roof of EAF with High Molten Iron Charging Ratio  

作　　者：CHEN Yang WU Hongping ZHU Dongdong ZHANG Hang 

机构地区：[1]Puyang Refractories Group Co.,Ltd. [2]Xinyu Iron & Steel Group Co.,Ltd.

出　　处：《China's Refractories》2014年第2期27-29,共3页中国耐火材料（英文版）

摘　　要：Specimens of magnesium aluminate spinel castable and calcium aluminate cement bonded bauxite based castable were prepared using special bauxite （particle size ≤8 mm ） and sintered magnesia as aggregates, SiO2 micropowder, α-alumina micropowder and calcium aluminate cement as binders, drying, firing at 1 350 ℃ and 1 500 ℃ for 3 h, respectively. The bulk density, cold modulus of rupture, cold crushing strength, permanent change in dimensions on heating, thermal shock resistance and slag resistanee were determined. The results show that compared with calcium aluminate cement bonded bauxite based castable, the magnesium aluminate spinel castable has higher cold crushing strength after drying, better slag resistance but worse thermal shock resistance. Magnesium aluminate spinel based roof of EAF with high molten iron charging ratio has a longer service life.Specimens of magnesium aluminate spinel castable and calcium aluminate cement bonded bauxite based castable were prepared using special bauxite （particle size ≤8 mm ） and sintered magnesia as aggregates, SiO2 micropowder, α-alumina micropowder and calcium aluminate cement as binders, drying, firing at 1 350 ℃ and 1 500 ℃ for 3 h, respectively. The bulk density, cold modulus of rupture, cold crushing strength, permanent change in dimensions on heating, thermal shock resistance and slag resistanee were determined. The results show that compared with calcium aluminate cement bonded bauxite based castable, the magnesium aluminate spinel castable has higher cold crushing strength after drying, better slag resistance but worse thermal shock resistance. Magnesium aluminate spinel based roof of EAF with high molten iron charging ratio has a longer service life.

关 键 词：magnesium aluminate spinel electric arcfurnace roof molten iron 

分 类 号：TQ175.1[化学工程—硅酸盐工业]