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过程工程学报 2011
ExtractionofAluminafromCoalFlyAshwithSulfuricAcidLeachingMethodKeywords: coalflyash,alumina,sulfuricacid,leaching,thermodynamics,kinetics Abstract: Coarseg-Al2O3powderwaspreparedthroughacidleaching,solid-liquidseparation,crystallizingandaluminumsulfatedecomposingprocessesusingcoalflyashandconcentratedsulfuricacidasrawmaterials.ThemetallurgylevelAl2O3canbeobtainedbydisposingcoarseg-Al2O3powderwithBayerprocess.Theoptimumconditionsofacidleachingprocessweredeterminedbyexperiments.TheextractionrateofAl2O3canbestabilizedatabout87%undertheseconditions.Thethermodynamicsandkineticsofsulfuricacidleachingprocesswerestudiedwithirreversiblethermodynamics.
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