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©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(,650093)SiF2-6.;,,SiF2-6,;.:H2SiF6;SiF2-6;;:O611.65:A:1007-855X(2001)03-097-041[1]1.1NaOHH2SiF6:pH=3.4,H2SiF6+2NaOHNa2SiF6+2H2O,;pH=7,H2SiF6+6NaOH6NaF+Si(OH)4+2H2O.(NaOH,KOH),.K2SiF6,NaOH.H2SiF6+2KClK2SiF6+2HClHCl+NaOHNaCl+H2O,,.80SiF2-6.,2molNaOH.0.1MNaOH0.70.8g30%H2SiF6,15BaCl2.0.080.16H2SiF6.BaSiF6.,NaF.NaF,,.H2SO4+H2SiF6+HFNaOH..3040min;H2SO4+H2SiF62.4%,HF0.4%.5min.NaOH.1.2F-29wt%H2SiF6F-.F-NH3,3MCH3COONH4(pH=5.75.9),pH.2030,(0.51.15%)..F-H2SO4H2SiF6HF.SiF2-6K2SiF6,pH=5,F-.HFF-SiF2-6,H2SO4H2SiF6+HF.263Vol.26No.320016JournalofKunmingUniversityofScienceandTechnologyJun.2001:2000-11-01;:;:(1962),,,.©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(NO3)4vs..H2SiF6Ag2O.:SiF2-6+2H++3Ag2O+(n-1)H2O=6F-+6Ag++SiO2nH2O.1.3SiF2-6Na2SiF6+Ce2(SO4)3+4H2O2CeF3+Si(OH)4+Na2SO4+2H2SO4Ce2(SO4)3.:5mlpH=6.010ml5%Na2SO4520ml,,0.05MCe2(SO4)3,,SiF2-610ug.ZnBi,EDTA,Fe(III)Fe(II).F-PO3-4SO2-3NO-2.PbBiPb+H2SiF6Bi+H2SiF6,,X.22.1:(1)HF;(2)H3PO4.(1)CaF2H2SO4HF,CaF2HF,98%CaCO3,1%SiO2,HF,SiF4.HF,SiF4CO2SO2H2SiF6.3SiF4+2H2O=2H2SiF6+SiO2,SiO2HF.2.2H2SiF6,:SiO2H2O;SiF4,HFSiF4SiF4;IR-120Na2SiF6.3,.HFSiF4..()HFH2SiF6SiF4.2.5mgF/m3.140mgF/kg.20%35%.,,.4SiF2-61,2[2].1SiF2-6(298.15K)CpJKmol-1Cp/CvSJKmol-1H-H0JKmol-1-(G-H0)/TJKmol-1fHKJ/molfGKJ/molfSJmol-1K-1113.051.079309.919.96243.0-2389.1-2199.4122.2;.,.,.,2.,,8926©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(SiF6)33H2OH2SiF61.1816.1wt%,,25.923.1g/L(25),19.711.3g/L(50).25,SrSiF614.9wt%,MgSiF623.5wt%[3].2[4]Na2SiF4K2SiF6Rb2SiF6Cs2SiF6FeSiF6BaSiF6(NH4)2SiF61.3121.3641.3701.3091.3852.6792.6653.3323.3721.9614.292.01K/gcm-3(290K)6.521.201.6060012820.261864.1[5](1),.,,.Na2SiF6+H2SO4=SiF4+2HF+Na2SO43SiF4+4H2O=H4SiO4+2H2SO4(2),.Na2SiF6+BaCl2=BaSiF6+NaClHFSiF4,.(3),,.Na2SiF6+4NH3+3H2O=H2SiO3+2NaF+4NH4F(4),.M2SiF6+4NaOH=2MF+4NaF+SiO2+H2O,:BaSiF6+4NaOH=2BaF2+4NaF+Si(OH)4(5),.H2SiF6+2KCl=H2SiF6+2HCl4.2SiF2-6SiF2-6:SiF2-6+H3O+SiF5(OH2)-+H++F-.,Na2SiF6Na2CO3,:SiF2-6+(n+2)H2OSiO2H2O+4H++6F-,SiF2-6.H2SiF6.SiF2-6SiF2-6,,,.SiF2-6-102-105.[Al(H2O)6]3+SiF2-6[AlFaq]2+[AlF2aq]+[AlF3aq].SiF2-6Fe2+Co2+Ni2+Cu2+Cr3+:M2++SiF2-6MSiF6;K3[6].993,:©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=3.858.75,Fe(O)OHSiF2-6F-,OH.5,1..,,..:[1]GmetinHandbook.SiSuppl:B8[M],1993:120177.[2]GmetinHandbook.SiSuppl:B7[M],1992:279307.[3]Ricci,J.E.,Sdarulis,J.A.J.Am.Chem[M].Soc.,1951,(73)361819.[4],.:.[M].:.1998(1):262263.[5],,.[M]..:.1994(3):17061708.[6]Haque,R..Cyr,N..Trans.FaradaySoc.66[M],1970:184853.SomeKnowledgeofH2SiF6andItsSaltsWEIChang,WANGJun-zhong,JIANGQi(TheFacultyofMaterialsandMetallurgicalEngineering,KunmingUniversityofScienceandTechnology,Kunming650093,China)AbstractAnalysis,manufacturing,application,toxicityofH2SiF6andpropertiesofSiF2-6arepresented.AnalysisofH2SiF6aqueoussolutionhasseveralmethodssuchaschemistryanalysis,potentionmetricaltitrationandphotometrictitration,andsoon.Somepropertiesofhexafluorosilicates,andchemicalreactions,hydra2tion,andsorptionofSiF2-6,andapplicationsofH2SiF6anditssaltsaregived.Hexafluorosilicatescanreactwithstrongacid,alkaliandsomesalts.Keywords:aqueoussolutionofH2SiF6;SiF2-6;properties;application00126