PURPOSE: To obtain the refractory that has excellent flowability at ordinary temp. and causes no change in the lapse of time during its preservation in a wet state and also is hardened in a short time through heating to a low temp. by mixing refractory aggregate, a thermosetting material, a heat-sensitive gelatinizing agent and a binder, each of which is specific, in respective prescribed amounts.
CONSTITUTION: In the production of this refractory, first, 100 pts.wt. aggregate (e.g. electrofused alumina, etc.) of which particle size distribution is adjusted so that it contains a 10 to 30wt.% fine powder having ≤44μ particle size, a 0.1 to 10 pts.wt. thermosetting material consisting of a phenol resin having a 70 to 200°C softening point, a 0.1 to 10 pts.wt. polysaccharide based heat- sensitive gelatinizing agent (e.g. corn starch) and a 0. 5 to 3 pts.wt. hardly soluble binder consisting of hardly soluble sodium phosphate and/or condensed aluminum phosphate are mixed together. Then, water is added to this mixture and the resulting material is kneaded and cast and thereafter the cast material is heated to 60 to 100°C to harden it and to obtain the objective refractory.
IDE ISAMU
HIGUCHI NAOTO
AOYAMA CHIYOMI
LIGNYTE CO LTD
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