Bloating Type Refractories—A Preliminary Study

Abstract

Bloating type of refractories including ladle bricks, stopper heads and nozzles are reported to behave in a better way than the conventional non-bloating type of similar refractories. To develop this type of refractories preliminary investigations have been carried out and results indicate the possibility of producing such refractories from the compositions having ordinary ferruginous clays containing about 6–7% Fe₂O₃ along with some alkalies and CaO. Bloating was found to be due to the evolution of SO₂ at about 1250°C. Gypsum and salt-cake may be used advantageously. Compositions have been developed with 10–15% linear expansion at 1400°C.