ALUMINA-CARBON UNFIRED BRICK FOR LINING MOLTEN METAL HOLDING FURNACE, METHOD FOR PRODUCING THE SAME, AND FURNACE EQUIPMENT AND CONSTRUCTION METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To inhibit a hydration reaction in a spinel added alumina-carbon unfired brick, to enhance corrosion resistance to various slags and hot strength, and to improve thermal conductivity maintaining characteristics so as to reduce heat loss by release from a molten metal holding furnace.;SOLUTION: The alumina-carbon unfired brick for lining a molten metal holding furnace is provided which is obtained by adding an organic binder to a refractory raw material composition consisting of 6-25 mass% of a carbon raw material, 0.1-4 mass% of aluminum and/or aluminum alloy, 2-20 mass% of a spinel ultrafine powder and the balance essentially an alumina raw material, kneading these, molding and heat treating at ≤1,000°C. The spinel ultrafine powder in the refractory raw material composition has a particle size of 150 μm and an average particle diameter of 0.1-50 μm and consists of 25-50 mass% of MgO and the balance Al₂O₃.;COPYRIGHT: (C)2012,JPO&INPIT