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201011314PreciousMetalsNov.2010Vol.31,No.43,,,,,3(,,650106):,99.95%,99.5%,99%:;;;;:TF83:A:1004-0676(2010)04-0029-03NewRecoveryProcessofPlatinum&SilverfromSilverIodideResidueHEXiaotang,WUXilong,GUOBaohua,YURulong,ZHAOFei,HANShouli3(StateKeyLaboratoryofAdvancedTechnologiesforComprehensiveUtilizationofPlatinumMetals,Sino-PlatinumMetalsCo.Ltd.,Kunming650106,Yunnan,China)Abstract:AnewprocesshasbeenestablishedtorecoverplatinumandsilverfromPt-containingsilveriodideresidue.Silverandplatinumwereseparatedfromtheresidethroughthreesteps.Thefriststepisthereductionoftheresiduebyhydrazinehydrate,convertingplatinumandsilversaltintometalpowder.Afterthat,smeltthemixturepowderintoplatinum-silverbullion,thendissolvethebullionwithconcen2tratedsulfuricacid.Platinumwasrefinedbythetraditionalmethods.Thepurityofthespongeplatinumwas99.95%with99.5%oftherecoveryrate.Thesilverwasdissolvedagaintoproducesilvernitrate.Therecoveryrateforsilverwasupto99%.Keywords:metallurgy;silveriodideresidue;silver;platinum;recovery5%8%(,),:[1][2],,,,,20%Pt,Ag2PtCl6AgCl,,,,[3-4],11.1,5%8%Pt1.213:2010-01-04:,,,3:,,,E-mail:HSL@ipm.com.cn311Fig.1Technologicalprocessofrecoversilver&platinumfromsilveriodineresidue22.1,,,1000g300mL80%90,1h,(1)(2):2Pt(NH3)I2+N2H4H2O+4NaOH2Pt+4NaI+N2+5H2O+2NH3(1)4AgI+N2H4H2O+4NaOH4Ag+4NaI+N2+5H2O(2),3,,21335g,8.16%Pt83.08%Ag,2.2,,[5],11(25)Tab.1Solubilityofsilversulfateinsulphuricacidofdifferentconcentration(25)12345678/(mol/L)1815129630.50/(g/L)209.0078.9431.209.145.588.4911.148.741,18mol/L,,,,,2.2.1:,,22Tab.2Effectsofmaterialstatusondissolutionofsilverbyconcentratedsulfuricacid/(g/L)/%/%PtAgPtAgPtAg300g0.001125.049.8546.900.00489.90300g0.0004110.896.513.320.00399.232,,,,89.90%,46.90%,,,,,,,5%,,,,,2.2.2:,,,1300,30min18139g,9.14%Pt90.64%Ag(NaI),034:98%110L,(V)(W)=561,150,3h,,31,,1121765.61g,93.88%Pt4.57%Ag99.51%,2.3,,[6]3,,pH=11,,,11,,,,99%2.4,,Pt6080g/L,,,,99.95%,99.5%3,,,,99.5%,99%,,,,,:[1].[M].:,1991.[2],,,.[J].,1997,28(S1):291-293.[3].[M].:,1998.[4]O.E,().[M].:,1988.[5],.[J].,1997,16(1):71-76.[6].[J].,1998,19(2):36-39.(28)[4]JamesEHoffmann.Recoveringplatinum-groupmetalsfromspentautocatalyst[J].JOM,1988(6):40-44.[5],,,.[J].,2006,16(2):363-369.[6].[J].,2005,26(2):86-92.13