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Coarse γ-Al2O3 powder was prepared through acid leaching,solid-liquid separation,crystallizing and aluminum sulfate decomposing processes using coal fly ash and concentrated sulfuric acid as raw materials.The metallurgy level Al2O3 can be obtained by disposing coarse γ-Al2O3 powder with Bayer process.The optimum conditions of acid leaching process were determined by experiments.The extraction rate of Al2O3 can be stabilized at about 87% under these conditions.The thermodynamics and kinetics of sulfuric acid leaching process were studied with irreversible thermodynamics.
Coarse γ-Al2O3 powder was prepared through acid leaching, solid-liquid separation, crystallizing and aluminum sulfate decomposing processes using coal fly ash and concentrated sulfuric acid as raw materials. Metallurgy level Al2O3 can be obtained by disposing coarse γ-Al2O3 powder with Bayer the optimum conditions of acid leaching process were determined by experiments. The extraction rate of Al2O3 can be stabilized at about 87% under these conditions. thermodynamics and kinetics of sulfuric acid leaching process were studied with irreversible thermodynamics.