IMPROVED PROCESS FOR THE MANUFACTURE OF AN ENCAPSULATED REFRACTORY BRICK, PARTICULARLY SUITABLE FOR DRAWER DRAWERS FOR CASTING POCKETS, CASTING FUNNELS AND THE LIKE, AND REFRACTORY BRICKS THUS OBTAINED

摘要

An improved process for the manufacture of an encapsulated refractory brick particularly suitable for drawer unloaders for pouring ladles, pouring funnels and the like, and refractory bricks thus obtained. /P P The present invention relates to a process for manufacturing a refractory brick 10 encapsulated in a metal casing 20, consisting in mixing the refractory compounds in preferably basic granules with a chemical binder, in bringing this mixture to the state free in the metal casing 20, compressing said mixture in said casing and then straightening and rectifying the surface 11 of the refractory brick 10 emerging from the casing, this process being characterized in that at least a fraction of the compounds refractory consists of alumina in a minimum amount of 20% and that in addition, a preformed sleeve preferably consisting of a refractory composition comprising a ceramic bond can be inserted into said casing before the molding of the remaining part of the refractory brick 10 to protect the taphole 40. /P P Use of these bricks in a drawer unloader.