Zircon-quartzite and zircon-clay refractories

The authors have investigated the properties of zircon-quartzite and zircon-clay refractories. They have established that the use of both quartzite and zircon in the masses permits the preparation of refractories which expand during heating and have a fairly high refractoriness and softening point under a load of 0.2 MPa; in this connection regeneration of quartz and dissociation of zircon are not intensified. The best quality indices are displayed by specimens containing more than 60% of zircon.