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ExtractionofAluminafromCoalFlyAshwithSulfuricAcidLeachingMethod

Keywords: coalflyash,alumina,sulfuricacid,leaching,thermodynamics,kinetics

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Abstract:

Coarseg-Al2O3powderwaspreparedthroughacidleaching,solid-liquidseparation,crystallizingandaluminumsulfatedecomposingprocessesusingcoalflyashandconcentratedsulfuricacidasrawmaterials.ThemetallurgylevelAl2O3canbeobtainedbydisposingcoarseg-Al2O3powderwithBayerprocess.Theoptimumconditionsofacidleachingprocessweredeterminedbyexperiments.TheextractionrateofAl2O3canbestabilizedatabout87%undertheseconditions.Thethermodynamicsandkineticsofsulfuricacidleachingprocesswerestudiedwithirreversiblethermodynamics.

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