| abstract |
(57) [Summary] [Problem] It is not necessary to dispose of the amorphous refractory remaining in the equipment even after spraying is completed, it is possible to keep it, and it can be used even after the next day, cost To provide an alumina cement composition, an amorphous refractory, and a spraying method thereof, which can be reduced and work time can be reduced, and the pot life is extremely long. SOLUTION: It is composed of crystalline and amorphous, and has a mineral composition of Ca. O 2Al 2 O 3 is 60 to 95% by weight, 2CaO Al 2 O 3 SiO 2 is 5% Calcium aluminate having a CaO.Al 2 O 3 content of 10% by weight or less, and calcium aluminate and α-alumina having an average particle diameter of 10 μm or less and a BET specific surface area of 5 m 2 / g or less. Alumina cement blended, alumina cement composition blended with the alumina cement and setting retarder, amorphous refractory blended with refractory aggregate and alumina cement composition, combined use of the amorphous refractory and quick setting agent The spraying construction method was adopted. |