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Mullite production

阅读:123发布:2023-09-10

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1. IN A PROCESS FOR PRODUCING RELATIVELY VOLUME STABLE MULLITE AGGREGATE FROM CRUDE BAUXITE CONTAINING AT LEAST OF THE ORDER OF 70 TO 80% AL2/3, BY WEIGHT, ON AN OXIDE IGNITION FREE BASIS, THE STEPS COMPRISING FORMING THE BAUXITE INTO AN AQUEOUS SUSPENSIN BY AGITATING AND DISPERSING THE BAUXITE TO YIELD A UNIFORM MIXTURE CONSISTING OF BAUXITIC MATERIAL AND NONBAUXITIC IMPURITIES, SUBSTANTIALLY ALL OF SAID IMPURITIES HAVING A PARTICLE SIZE GREATER THAN THE BAUXITE MATERIAL, REMOVING THE NONBUAXITIC IMPURITIES FROM THE MIXTURE, BLENDING THE SUSPENSION WITH A FLOCCULATING AGENT TO FORM A RELATIVELY COARSE AGGREGATE, BURNING THE RESULTING AGGREGATE IN A ROTARY KILN AT A TEMPERATURE OF FROM 2900*F. TO JUST BELOW THE INCIPIENT FUSION POINT, THE RESIDENCE TIME OF THE MATERIAL IN THE KILN BEING OF THE ORDER OF AT LEAST 2 HOURS AND RECOVERING SUBSTANTIALLY IRON-FREE MULLITE GRAIN MINERALOGICALLY CHARACTERIZED BY RELATIVELY LARGE AND STABLE, WELL-PACKED, CRYSTALS WITH FEW VOIDS.
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