Aluminous refractory compositions containing carbon, silicon and chrome oxide
AssigneeChicago Fire Brick Company
InventorHarold L. Rechter
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Abstract
A composition blending carbon with powdered chromium oxide in an alumina or aluminum silicate matrix, including silicon metal powder to inhibit carbon oxidation, is more advantageous in resisting molten iron and slags than refractories based on carbon or chrome additions not combined. The resultant refractory mixes are suitable for all conventional application methods.
Claims12
In a refractory composition comprising alumina or aluminum silicate refractory material, carbon and powdered silicon, the improvement of having chromic oxide and carbon present in the composition in amount sufficient to give greater resistance to slag over that of aluminous composition in which chromic oxide and carbon are absent, said carbon being present in up to about 35%.
A refractory composition comprising
- ______________________________________ % by weight ______________________________________ Alumina or aluminum silicate aggregate 20-52 High alumina fines, -200 mesh 0-12 Carbon or graphite 5-35 Silicon metal powder 5-25 Chromic oxide 5-30 Fine plastic clays 0-15 Coal tar pitch 0-10 Green binders (lignosulfonates or aluminum sulfate) 0-7 High alumina cement 0-25 Phosphoric acid or aluminum phosphate 0-8 . ______________________________________
Dependencies are inferred from the claim text.