poroeser refractory body, in particular for the introduction of gases in the melt or daempfen metallurgical processes

摘要

1,179,557. Porous refractions. DIDIER WERKE A.G. 19 Oct., 1967 [19 Oct., 1966], No. 46850/66. Heading C1J. A porous body of a cold crushing strength of at least 200 kg./cm.2 consists of a coarse refractory sintered with less than 10% of a binder and has pores of cross-section not less than 0-05 mm. and a gas permeability of at least 100 Nanoperm (defined). Specified coarse materials are mullite, sintered magnesite and corundum, whilst binders are (1) clay and aluminium dihydrogen phosphate for mullite and corundum, and (2) caustic MgO with either or both boric acid and iron oxide.