Refractory for casting and method of manufacturing the same

A method of manufacturing a refractory for casting comprises the steps of:

• mixing and kneading a raw material containing an organic binder and a refractory composition containing:
• (a) 3 to 60 wt % of clinker having a mineral crystal phase consisting essentially of mullite and baddeleyite, and containing 5 to 22 wt % of alumina (Al.sub.2 O.sub.3), 38 to 68 wt % of zirconia (ZrO.sub.2) and 27 to 40 wt % of silica;
• (b) 5 to 40 wt % of at least one carbon-based material selected from the group consisting of graphite and carbon with the proviso that when the organic binder is remained in the form of carbon after sintering, the carbon remained is included in the carbon-based material;
• and
• (c) at least one refractory element as a balance selected from the group consisting of alumina, fused silica, zirconia, silicon carbide, mullite and a metal silicon, with the proviso that silicon carbide is used at most 30 wt % and a metal silicon is used at most 10 wt %,
• molding the mixture;
• and
• sintering a molded body at 800.degree. to 1200.degree. C. in a non-oxidizing atmosphere or with breeze.