PURPOSE: To improve erosion resistance and spalling resistance and to make effect of prevention to gas leakage much by using carbon-containing refractory as the outer circumferential refractory and arranging porous quality refractory in the inner part thereof.
CONSTITUTION: The burnt or non-burned carbon-containing refractory of blended material containing 1-40wt.% carbon can the balance refractory aggregate as the essential material is used for the outer circumferential refractory 2. In the inner part thereof, gas permeable porous refractory 1 is arranged to form a porous plug for blowing gas. The porous refractory 1 is desirable to use alumina-base burnt product having corrosion resistance in common with spalling resistance. It is desirable to insert mortar between both refractories 1, 2. Side face and rear face of porous plug are covered with metal case 3 and a gas introducing tube 4 is connected to the rear face of metal case 3.
HARADA TOMIO
KOMIYA TOSHIAKI
TSUCHINARI AKIHIRO
SHIMOBAYASHI OSAMU
TAJI TAKASHI
NIPPON STEEL CORP
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