METHOD OF RECYCLING USED MAGNESIA, SPINEL AND ALUMINA REFRACTORY

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PROBLEM TO BE SOLVED : To provide a technology for recycling used oxide based refractory in consideration of environmental pollution and a problem in terms of effective utilization of mineral resource of the earth due to the waste of the refractory used in a steel making blast furnace or an industrial kiln. SOLUTION : A method of synthesizing magnesium aluminum oxynitride from a raw material containing components of magnesia, alumina and carbon effectively uses the used magnesia, magnesia-spinel and alumina refractory as a part or the whole of the raw material. The magnesium aluminum oxynitride is synthesized by blending each raw material so that a resultant prepared mixture contains 1-30 mass% magnesia, 50-95 mass% alumina and 0.5-30 mass% carbon as chemical components and heating the resultant prepared mixture at 1, 400-1, 800°C under a gaseous nitrogen atmosphere. COPYRIGHT : (C)2008, JPO&INPIT