| 摘要 |
PROBLEM TO BE SOLVED: To obtain refractory suitable for checker brick used for a regenerator additionally installed in a glass furnace by clacining magnesia-rich spinel clinker powder specified in a specific range of the weight content ratio of MgO/Al2 O3 . SOLUTION: This refractory is obtained by calcining magnesia-rich spinel clinker powder having a weight content ratio MgO:Al2 O3 of (40:60)-(60:40), pref. (45:55)-(55:45) and is excellent in corrosion resistance even when the refractory contains phosphorus and/or antimonial contaminant, and is useful for a regenerator (esp. used for middle stage). The spinel clinker powder pref. contains >=50 wt.% particles having a particle diameter of <=1 mm and is calcined at about 1,600-1,700 deg.C for about 3 h. An increase in minuteness and compressive strength and the decrease of apparent porosity are actualized by mixing pure spinel clinker powder in which the weight ratio of MgO/Al2 O3 is (20/80)-(40/60), pref. (25/75)-(35:65) and the particle diameter is >=1 mm in a quantity of about 45-15 wt.%, with the refractory. |
