PRODUCTION OF CARBON-CONTAINING BASIC REFRACTORY

摘要

PROBLEM TO BE SOLVED: To obtain the subject refractory having sufficiently high resistance to corrosion and spalling even if used as a refractory for the gas blowing tuyeres for molten metal vessels or as a refractory for the periphery of such tuyeres. SOLUTION: This carbon-contg. basic refractory is obtained by the following process: a blend as the main feedstock comprising 5-40wt.% of a carbonaceous material and 60-95wt.% of refractory aggregates predominant in refractory material is kneaded with a carbonaceous resin as a binder followed by carrying out a molding, and the resultant molded product is baked and impregnated with pitch and/or carbonaceous resin; the baking and impregnating process is conducted several, times. Besides, the corrosion resistance and other properties of this refractory can be further improved when the proportion of the refractory material particles <=10μm in size in the refractory aggregates is brought to 5-15wt.% based on the whole blend of the refractory aggregates and the carbonaceous material.