Cement-free refractory castable system for wet process pumping/spraying

摘要

A method of applying a cement-free refractory castable to the surface of a refractory structure, comprising the steps of: a) preparing an intimately mixed refractory castable having alumina aggregate and a cement-free binder comprised of hydratable alumina; b) conveying the refractory castable under pressure through a delivery hose to a dispensing nozzle for applying the refractory castable; and, c) adding a salt solution to the refractory castable prior to application by the nozzle at a rate wherein the salt solution comprises about 0.2% to 0.9% by weight of the refractory castable applied by the dispensing nozzle.