| 摘要 |
PROBLEM TO BE SOLVED: To obtain a castable refractory for a spout of a blast furnace in a metal line which is excellent in corrosion resistance. SOLUTION: The castable refractory for the spout of the blast furnace is constituted such that the 100% aggregate of the refractory composed of 10-60% alumina, 30-80% MgO.Al2 O3 based spinel, 2-10% silicon carbide, 1-10% carbon, in mass %, is added with a binder and a dispersant, wherein the silicon carbide of 1-7% among above silicon carbide is silicon carbide fine powder of <=15 μm in grain diameter, MgO.Al2 O3 based spinel of 5-30% among above MgO.Al2 O3 based spinel is <=1 mm in grain diameter. The corrosion resistance of the refractory is further improved if the MgO.Al2 O3 based spinel of <=1 mm in grain diameter is an alumina rich spinel containing MgO chemical ingredient value of 5-20%, and containing >=80% Al2 O3 . |
