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Coarse γ-Al2O3 were prepared by acid leaching, solid-liquid separation,crystallizing and aluminium sulfate decomposed processes using coal fly ash and sulfuric acid as raw materials.The metallurgy level Al2O3 can be gotten by disposing Coarse γ-Al2O3 with Bayer process.The thermodynamics and dynamics of sulfuric acid leaching process were studied.The optimum conditions of acid leaching process were defined by experiments.The Al2O3 extracted rate can be stabilized about 87% under these conditions.