Refractory material prepn with zirconium cpd addn - gives refractory which resists attack by alkaline slags

摘要

A refractory material is prepd. by mixing 75-95% sand, >=1% Al2O3 present as a constituent of a clay, and a cpd. contg. Zr silicate in an amt. such that, after firing into the refractory. The refractory is used for lining metallurgical vessels, esp. ladles for pouring cast iron or steel. The Zr cpd. which is highly refractory is not as expensive as Al2O3. The refractory resists attack by alkaline slags resulting from the desulphurisation of cast iron.