Abstract
It is important in cupola operation to solve the lining erosion mechanism. The authors studied the erosion resistance and the change of chemical composition and mineral materials in the erosion zone. Using neutromelt ganister for the cupola lining materials, it is expected that a similar formation of new mineral materials would occur as is produced by the reaction between molten iron and slag on a clay bond graphite crucible. The following results were obtained : 1. Neutromelt ganister is manufacured by a special method whereby silica material is coated with graphite. The grain size distribution was found to contain two peaks at about 0.1-0.5mm dia. and 2-3mm dia. 2. The reaction between molten iron and slag created an alteration zone. This zone had a very stable erosion resistance against acid slag but not so good against basic slag. 3. This zone was very thin about 1-2mm thick and a large number of SiC particles were present unusually. 4. The other zone was very weakly sintered, but such defects as a) peel back b) cracks perpendicular to the surface and c) spalling were not observed in this zone.
