To improve spalling resistance and obtain the same durability as brick even in a case where execution range is wide by compounding a mullite raw material specified in particle diameter and alumina content with artificial graphite having a specific particle diameter at a specific ratio.
This monolithic refractory comprises 10-70 wt.% mullite raw material containing 65-90 wt.% alimina having 100 μm to 10 mm particle diameter and 3-20 wt.% artificial graphite having 100 μm to 1 mm average particle diameter. Generally commercialized electrofused product or baked product can directly be used as the mullite raw material and, as necessary, single mullite raw material or plural mullite raw materials are pulverized and classified and compounded and can be used singly or as a mixture of the plural raw materials. It is preferable to add and use 0.5-6 wt.% pitch powder having 100 μm to 1 mm particle diameter and 4-12 wt.% SiC powder having ≤100 μm particle diameter as additives to the monolithic refractory. Further, 1-10 wt.% magnesia or sillimanite mineral raw material having 100 μm to 3 mm particle diameter can be added to the monolithic refractory.
KUMAGAI MASATO
URUSHIYA AKITOSHI
TERAYAMA SATORU
KOMATSUBARA NOBORU
KAWASAKI REFRACTORIES CO LTD