AMORPHOUS REFRACTORY FOR HOT METAL PRETREATMENT VESSEL

PURPOSE:To obtain the title highly durable refractory significantly improved in corrosion, wear and infiltration resistance against hot metal or hot metal pretreated slag and also improved in texture reinforcement and mechanical strength by incorporating an alumina raw material with B4C and ultrafine silica powder followed by a dispersant and binder. CONSTITUTION:The objective refractory can be obtained by incorporating (A) a dispersant plus binder into (B) a composition comprising (1) 100 pts.wt. of an alumina raw material, (2) 0.8-3.0 pts.wt. of B4C and (3) 1-6 pts.wt. of ultrafine silica powder. Further incorporation of a combination of the above components A and B with 1-8wt.% of at least one kind of fine powder selected from Al, Si and Al-Si alloy with result in reinforcement of the refractory texture and oxidationproof effect, therefore being preferable. Or, in the above-mentioned blend, in place of 100 pts.wt. of the alumina raw material, 100 pts.wt. of a refractory material comprising (a) 50-98wt.% of an alumina raw material and (b) 2-50wt.% of at least one kind of materials selected from silicon carbide and carbonaceous materials may be used.