Carbon-contg. refractories for furnaces and torpedo ladles - produced using graphite, carbon black or coal dust to reduce pollution

摘要

Carbon-contg. refractory bricks are produced by mixing the starting material with a chemical binding agent and adding the carbon, moulding and tempering at =800 degrees C. The carbon additive consists of graphite, carbon black, coal dust, or a mixt. of these in an amt. comprising 1-50 (1-20) wt.% of the mixt. of the total wt. of the refractory. The carbon is added to the mixt. of starting material and binder before moulding. Pref. starting materials are corundum, aluminosilicate with 30 wt.% Al2O3, spinel, magnesite or magnesitechrome. Used in industrial furnaces and torpedo ladles. Method is clear ad environmentally acceptable.