| 摘要 |
PROBLEM TO BE SOLVED: To obtain a basic indeterminate refractory compact capable of preventing a slaking reaction of magnesia even when drying a thick compact having several hundreds mm thickness, and further to provide it production method. SOLUTION: This basic indeterminate refractory compact comprises 35-85% magnesia consisting of the whole particles with >=0.1 mm particle diameters and having >=98% purity, and 15-65% alumina consisting of the whole particles with <=1 mm particle diameters and an average particle diameter smaller than that of the magnesia, and further contains 0.01-1.0% super fine particles consisting of the whole particles with <=0.1 μm particle diameters expressed in terms for the outer percentage. The basic indeterminate refractory compact has a particle construction regulated so as to have >=0.3 (q)-value of the Andreasen's size distribution equation [passed and accumulated weight distribution= (particle diameter)/(maximum particle diameter)}<q> ] applied for an inhomogeneous particle group, and has <=5 μm average pore diameter before the start of the use. the production method comprises irradiating the indeterminate refractory with microwaves in a reduced pressure atmosphere to dry the refractory while regulating the inner temperature of the refractory so as to be <100 deg.C. |
