Low cement refractory castable system for wet process pumping/spraying

摘要

A method of applying a high alumina, low cement refractory castable to the surface of a refractory structure, comprising the steps of: a) preparing an intimately mixed castable for application onto the surface of a refractory structure, the refractory castable including by weight the following components: 80% to 86% alumina aggregate, about 6% to 11% thermally reactive calcined alumina, about 4% to 8% calcium aluminate cement; b) conveying the refractory castable under pressure through a delivery hose to a dispensing nozzle for applying the refractory castable; and c) adding calcium chloride to the refractory castable prior to application by the nozzle at a rate wherein the calcium chloride comprises about 0.05% to 0.15% by weight of the refractory castable applied by the dispensing nozzle.