Patent ID: 6054186
Filing Date: 2000-04-25
Classification: C04B

Abstract:
A method of applying a high alumina, low cement refractory castable having a low silica content 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 stricture, said refractory castable comprised of the following components:a first refractory component comprised of about 80% to 86% by weight alumina aggregate,a second refractory component comprised of about 6% to 11% by weight thermally reactive calcined alumina having an average particle size of about 0.5 to about 3 microns, anda third refractory component comprised of about 4% to 8% by weight calcium aluminate cement;b) conveying said refractory castable under pressure through a delivery hose to a dispensing nozzle for applying said refractory castable;c) adding calcium chloride to said refractory castable prior to application by said nozzle at a rate wherein said calcium chloride comprises about 0.05% to less than 0.10% by weight of the refractory castable applied by said dispensing nozzle, said refractory castable having an aluminum oxide content by weight of greater than 95% by weight and having a silica content less than about 0.2% by weight; andd) applying said refractory castable to said surface.