| abstract |
An essentially non-slumping sprayable refractory castable composition that is applied without forms is disclosed comprising (a) a tempered, pumpable first component comprising (i) one hundred weight percent of a refractory composition comprising from about 60 to 90 weight percent of a refractory aggregate, from about 2 to 25 weight percent of an ultrafine refractory material having an average particle diameter size less than or equal to about 3 microns, from about 0.5 to 15 weight percent of a binder, and from about 0.05 to 2.0 weight percent of a dispersant, wherein all or a portion of the ultrafine refractory material comprises a thermal black such that the refractory composition comprises from about 2 to 15 weight percent of the thermal black, and (ii) from about 3 to 10 weight percent water based upon 100 weight percent of the refractory composition; and (b) a second component comprising a flocculating agent, wherein the second component is added to the first component for achieving installation of the sprayable refractory castable composition in an amount to prevent slumping. A method of installing the sprayable refractory castable composition is also disclosed. |