Abstract: An essentially non-slumping, high density, low moisture and low cement castable composition, consisting of a tempered, pumpable first component containing the castable solids and consisting essentially of a refractory aggregate, a calcium-aluminate cement, a flow aid, a deflocculating agent, and water, the water being present in the lowest amount sufficient to achieve a pumpable consistency of the tempered first component, and a flocculating agent as a second component to be added to said first component at time of installation in an amount sufficient to give the castable a dried bulk density of at least about 120 pcf. The invention also includes the method of applying such castable through a spray nozzle in which the flocculating agent is added to the tempered first component just prior to its application through a spray nozzle.

Abstract: A non-aqueous refractory maintenance mix made from 100% deadburned magnesite or other basic aggregate plus additions of coal tar pitch and a paraffin distillate oil. This mix is especially useful for the repair and maintenance of BOF, EAF, EBT, and OBT tapholes.

Abstract: A low thermal conductivity, high strength refractory castable composition with high abrasion resistance consisting essentially of about 55 to 80% by weight amorphous silica, about 5 to 25% by weight of a calcined alumino-silicate aggregate having a density of about 30 to 70 pcf and a particle size of about -10 to +65 mesh, about 5 to 40% by weight of calcined fireclay fines, about 1 to 10% by weight of a flow aid for particle packing, and about 5 to 25% by weight of a calcium aluminate cement.

Abstract: An refractory plastic comprising a refractory aggregate and a bonding and plasticizing agent consisting essentially of a powdered novolak resin and a solvent; said agent being present in an amount sufficient to plasticize said refractory.

Abstract: A slow setting resin-bonded taphole mix consisting essentially of a uniform admixture of a refractory grog and a bonding composition consisting essentially of a low volatile high softening point phenolic resin, a high boiling point for said resin, and a clay, and the method of using said mix to seal tapholes.