| 摘要 |
PROBLEM TO BE SOLVED: To obtain a refractory excellent in hot adhesivity and hot anti- detonation property, capable of suppressing the downfall phenomenon of a worked body and then improved in the reduction of unit or the working rate due to the decrease of the number of spraying times by adding a powdery sodium silicate and a weak acidic sodium phosphate to a refractory aggregate respectively in a specific quantity. SOLUTION: In a refractory aggregate formed by using, for example, magnesia, alumina, silica, silicon carbide, graphite, a refractory clay, metal silicon and the like in various ratios, 0.1-5.0wt.% powdery sodium silicate and 0.1-5.0wt.% weak acidic sodium phosphate are added. As the powdery sodium silicate, powdery sodium silicate #1, #2, #3, sodium silicate Silbons 130 and 330 (R) are exemplified. As the weak acidic sodium phosphate, one of 1% aq. solution having pH2.5-5.5 is preferably used and sodium dihydrogen phosphate (anhydride), acid sodium pyrophosphate and acid sodium hexametaphosphate are mentioned. |
