| 摘要 |
PROBLEM TO BE SOLVED: To obtain prepared unshaped refractories maintaining satisfactory strength in practical use and having high heat resistance, high heat insulating property and suitability to easy application and easy dismantlement. SOLUTION: The prepared unshaped reformatories are made of a mixture of 15-70 wt.% hollow alumina granules of 0.5-6.0 mm diameter, 2-30 wt.% at least one 1st fine refractory stock of <=1 mm diameter consisting essentially of magnesia and spinal, 8-60 wt.% 2nd fine refractory stock of >=1 mm diameter based on at least one of alumina, mullite, silica and zirconia, 5-45 wt.% at least one of hydraulic alumina an alumna cement contg. >=65 wt.% alumina, 0.01-0.4 wt.% air entrainer and 0.01-0.5 wt.% thickener. |
