| 摘要 |
PROBLEM TO BE SOLVED: To provide a refractory which is suitable for a lining of a blast furnace and excellent in service life by containing respectively specified quantities of carbon, MgO.Al2O3 calcined spinel super-fine powder, silicon carbide and alumina. SOLUTION: A refractory contains, by weight, 1-20% carbon, 1-20% MgO.Al2 O3 calcined spinel super-fine powder, 0-20% silicon carbide, and 20-95% alumina. Alternatively, the refractory contains 1-20% carbon, 1-70% MgO.Al2O3 spinel, 0-20% silicon carbide, 20-95% alumina, and the MgO.Al2O3 calcined spinel super-fine powder occupies 1-20% of MgO.Al2O3 spinel with reference to 100% refractory aggregate. The MgO.Al2O3 calcined spinel super-fine powder is preferably <=5 μm in average grain size. The super-fine powder is preferably <=1600 deg.C in burning temperature, and the component ratio of MgO to Al2O3 in the chemical composition is preferably 10-35% MgO, and the balance mainly Al2O3. |
