edta對鋁酸鈉溶液種分附聚影響的研究

1、中南大學碩士學位論文EDTA對鋁酸鈉溶液種分附聚影響的研究姓名：魏冰霞申請學位級別：碩士專業(yè)：冶金物理化學指導教師：劉常青20100524中南大學碩士學位論文ABSTRACTThecrystallizationofAI(OII)3fromseededsupersaturatedsodiumaluminatesolutionsisoneofthemostimportantprocessesinaluminaproductionButthe

2、developmentofaluminaindustryisseriouslyrestrictedbymanyproblemssuchastheslowseededprecipitationrateandtoobroaddistributionoftheparticlesizeofAI(OID3productAmongalltheenhancingmethods，theadvantageofadditiveisobviousButthe

3、effectofadditivesinsodiumaluminumsolutionontheagglomerationkineticsandparticlesizedistributionislessimpactofinformationEDTAwithfourcarboxyls，twoaminoswasusedasadditiveinthepaperThechangesofdecompositionrateandparticlesiz

4、edistributionduringthepreagglomerationofsodiumaluminatesolutionatdifferenttemperaturesarestudiedbyusingdynamicsandfractalanalysisTheeffectofEDTAonthestructuralchangesofsodiumaluminumsolutionwasalsoinvestigatedandtheenhan

5、cementmechanismwasdervicedConclusionsweremadeasfollows：1Duringtheinitialstageofagglomeration，EDTAcanpromotetheagglomerationofsmallparticlesandcontributetosecondarynucleationThesizeofnucleationparticlesisabout25～101xm2The

6、decompositionrateofsodiumaluminatesolutionatdifferenttemperatureisvibrated001m01L。1ofEDTAcanenhancethedecompositionofsodiumaluminatesolutionduringtheagglomerationstageTheactivationenergyoftheseededprecipitationisdecrease

7、dfrom4297kJmol～to3297kJmol～withtheadditionofEDTA3FractaltheorywasappliedtostudytheparticlesizedistributionofaluminumhydroxideThefunctionofparticlesizedistributionatdifferenttemperaturewithorwithoutadditiveswasobtainedasf