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Mullite production

阅读:470发布:2023-09-15

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1. IN THE PROCESS FOR PRODUCING RELATIVELY VOLUME STABLE MULLITE GRAINS FROM CRUDE BAUXITE, THE BAUXITE CONTAINING AT LEASTA OF THE ORDER OF 70 TO 80% AL2O3, BY WEIGHT ON AN OXIDE IGNITE FREE BASIS, THE STEPS COMPRISING FORMING THE BAUXITE INTO AN AQUEOUS SUSPENSION BY AGITATING AND DISPERSING THE BAUXITE TO YIELD A UNIFORM MIXTURE CONSISTING OF BAUXITRIC MATERIALS AND NONBUAXITIC IMPURITIES, SUBSTANTIALLY ALL OF SAID IMPURITIES HAVING A PARTICLE SIZE GREATER THAN THE BAUXITE MATERIAL, REMOVING THE NONBAUXITRIC IMPURITIES FROM THE MIXTURE, CALCINING THE RESULTING MIXTURE, PASSING THE CALCINE TO MEANS FOR FORMING SMALL BRIQUETTES UNDER A PRESSURE OF AT LEAST ABOUT 10,000 LBS, PER LINEAR INCH AND THEN BURNING THE BRIQUETTES IN A VERTICAL KILM AT A TEMPERATURE OF FROM 2900*F. TO JUST BELOW THE INCIPIENT FUSION POINT FOR A PERIOD OF THE ORDER OF AT LEAST 1 HOUR AND RECOVERING SUBSTANTIALLY IRON-FREE MULLITE MINERALOGICALLY CHARACTERIZED BY RELATIVELY LARGER AND STABLE. WELL-PACKED CRYSTALS WITH FEW VOIDS.
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