| 摘要 |
PROBLEM TO BE SOLVED: To provide a alumina-chromia based refractory suitable for a lining material being in contact with molten slag which is generated in a digestant melting facility for industrial waste, daily living sludge and municipal refuse. SOLUTION: The alumina-chromia based refractory for the ash melting furnace is so constituted that 70-95 wt.% of an alumina raw material in which Al2O3 value is >=99.0 wt.%, and grain diameter is 0.044-5 mm, 5-23 wt.% of chromia fine powder raw material in which Cr2O3 value is >=99.0 %, grain diameter is <=3 μm, and 0.5-10 wt.% of a silica raw material in which SiO2 value is >=99.0 wt.%, grain diameter is <=0.015 mm, and its mineral composition is consisting of two phases of corundum and alumina-chromia solid solution, and their composing ranges are represented by 0.65-0.85, and 0.15-0.31 in X-ray relative intensity ratio respectively. |
