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1、三氧化二铝物理性质Aluminaisusuallycalled"top〃，isakindofwhitepowder,whichiscovalentcompounds,themeltingpointis2050DEGC,theboilingpointof3000DEGC,truedensityis3.6g/cm3.Itsliquidityisgood,donotdissolveinwater,candissolveinthemoltencryolite・Itisthemainrawmaterialintheproductionofaluminumelectrolysis・Namealumin
2、a;corundum;whitejade;Ruby;sapphire;corundumpowder;corundumChemicalformulaA1203TheappearanceofawhitecrystallinepowderorsolidPhysicalpropertyFormula101.96amuMeltingpoint2303KBoilingpoint3250KDensity3.97kg/m・・Crystalstructure,threesquarecrystalsystem(HEX)ThermochemicalpropertiesDeltafHOliquid?1620.57
3、kj/molDeltafHOsolid?1675.69kj/molSOliquid,1,bar,67.24,J/mol,KSOsolid50.9,J/mol,K?SecurityIngestionoflowriskInhalationmaycauseirritationorlungdamageLowskinriskLowriskeyesUseSIunitsandstandardtemperatureandairpressurewithoutspecialmention・Aluminaisacompoundofaluminumandoxygen,andtheformulaisA1203.It
4、isalsocalledbauxiteinmining,ceramicsandmaterialscience・EmergencyManagementIsolateleakingpollutionareasandrestrictaccess・Recommendemergencyhandlingpersorrnelweardustmasks(overallcover)andwearprotectiveclothing.Avoiddust,carefullysweep,transfertoasafeplaceinabag・Ifalargeamountofleakage,coveredwithpl
5、asticsheeting,canvas・Collect,recycle,ortransporttoawastedisposalsite.PreparationStrongheataluminiumhydroxidecanobtainamorphouswhitealuminapowder.2A1(OH)3toAl203+3H20purpose1.,themaincomponentofrubyandsapphireisalumina,becauseofotherimpuritiesanddifferentcolors・Rubyisredwithchromeoxideandsapphireis
6、bluewithironoxideandtitaniumoxide.2.inthealuminumoremaincomponentbauxite,aluminacontentisthehighest・Theindustry,ironwerepurifiedbyBayerprocessaluminaalumina,andthenchangedfromHall-Heroultprocessforaluminummeta1.3.aluminaisthereasonwhyaluminumisdifficulttocorrodeintheair・Thepuremetalaluminumreactse
7、asilywithoxygenintheairtoformathinlayerofaluminafilmthatisexposedtothealuminumsurfaceintheair・Thislayerofaluminafilmpreventsthealuminumfrombeingoxidized・Thethicknessandpropertiesofthisoxidefilmcanbeenhancedbyapro
