高磷铁矿湿法脱磷废水除磷工艺及其循环利用夏文堂

　　　201129高磷铁矿湿法脱磷废水除磷工艺及其循环利用＊夏文堂1　陈星宇2　李会强1(1.,　401331;2.,　410083)　:以氧化钙为除磷剂,采用化学法对高磷铁矿脱磷废水除磷工艺进行探讨。研究了溶液pH值、反应温度、反应时间及搅拌速度对脱磷的影响。实验结果表明:在酸性含磷废水的pH为10、温度为70℃、反应时间为30min以及搅拌速度为200r/min的优化条件下,除磷效果最佳,脱磷率可达99.99%以上,废水的含磷量由3020μg/mL下降到0.5μg/mL以下,完全符合国家第二类污染物综合排放标准的一级标准磷含量要求。采用除磷后废水对高磷铁矿除磷,精矿中的磷含量均在0.1%以下,完全满足高炉冶炼配料要求,达废水减排效果。:高磷铁矿;废水;除磷;循环利用REMOVINGPHOSPHORUSFROMTHEDEPHOSPHORIZATIONWASTEWATEROFHIGHPHOSPHORUSIRONOREANDITSCYCLICUTILIZATIONXiaWentang1　ChenXingyu2　LiHuiqiang1(1.SchoolofMetallurgicalandMaterialsEngineering,ChongqingUniversityofScienceandTechnology,Chongqing401331,China;2.SchoolofMetallurgicalScienceandEngineering,CentralSouthUniversity,Changsha410083,China)Abstract:Theoxidationofcalciumisusedasphosphorusremovalagenttoremovephosphorusfromthedephosphorizationwastewaterofhighphosphorusironore.TheeffectsofsolutionpH,reactiontemperature,reactiontimeandstirringspeedondephosphorizationwereresearchedinthispaper.TheresultsshowthatontheconditionofpH10,temperature70℃,reactiontime30minandstirringspeed200r/min,thedephospho-rizationisthebestandcanreach99.99%,andthephosphoruscontentofwastewaterdecreasesfrom3020μg/mLto0.5μg/mLandcompletelyaccordswiththerequirementofnationaldischargestandardsofthesecondcategorypollution.Afterremovingphosphorus,thewasteisusedtoremovephosphorusfromthehighphos-phorusironore,thephosphoruscontentofironconcentrationoreisdecreasedto0.1%andalsofullyaccordswiththerequirementsofingredientsforblastfurnace,andthedischargewasteisreduced.Keywords:highphosphorusironore;wastewater;dephosphorization;cyclicutilization＊(CSTC,2009BA7071)。0　、,。,,,,。,,[1]。,,、[2-6][7-11]。,,,,、、、,。,,,,,。1　1.1　实验原理,、,4DOI:10.13205/j.hjgc.2011.s1.043　　　201129,。:CaO+2H+=Ca2++H2OCa2++H2PO4-+2H2O=CaHPO4·2H2O+H+Ca2++H2PO4-=CaHPO4+H+3Ca2++2H2PO4-=Ca3(PO4)2+4H+4Ca2++3H2PO4-+2.5H2O=Ca4H(PO4)3·2.5H2O+5H+5Ca2+3H2PO4-+H2O=Ca5(PO4)3OH+7H+DCP(CaHPO4)、DCPD(CaHPO4·2H2O)、HAP(Ca5(PO4)3OH)、β-TCP(Ca3(PO4)2)、OCP(Ca4H(PO4)3·5H2O)。1.2　实验料液及试剂,ρ(P)=3020μg/mL、ρ(Ca)=31.37μg/mL、ρ(Fe)=0.56μg/mL,0.89mol/L,。。1.3　操作方法,,pH;,,Fe、Ca、P。2　2.1　单因素条件对废水脱磷效果的影响2.1.1　pH,pH。pH,、60min,CaOpH。pH1。1　pH1,pH,“W”。,pH5.510。pH5.5,Fe3+,,,,[12]。pH10,,DCP(CaHPO4)、DCPD(CaHPO4·2H2O)、HAP(Ca5(PO4)3OH)、β-TCP(Ca3(PO4)2)OCP(Ca4H(PO4)3·5H2O),。,,,pH10,。2.1.2　,、pH8.5～11.5。1。1　/min/(μg·mL-1)50.217150.239250.239350.239600.228　　1,。pH8.5～11.5,P0.30%。,,30min。2.1.3　,pH8.5～11.5、30min。20,30,40,50,60,70,80℃,2。2　5　　　2011292,。,。20℃,0.525μg/mL;80℃,0.20μg/mL。,。,,。2.1.4　,70℃、pH8.5～11.5、30min。3。3　3,。,,。100～300r/min,0.25μg/mL。,,。,,200r/min。2.2　综合实验,:pH10、70℃、30min200r/min。,2。2　/mL/(μg·mL-1)/(μg·mL-1)/(μg·mL-1)1000.1591.0043.682000.1750.9543.603000.1291.1443.69　　2,,0.2μg/mL,GB8978-1996《》(≤0.5μg/mL),。3　。45min、0.147mm、4∶1、200r/min、、2.5mol/L。3。3　P/%/%Fe/%0.0661.2654.880.0771.5055.340.0521.3953.660.0711.6755.500.0941.2954.750.0771.6355.25　　:TFe46%,P0.715%。　　3,,,,0.1%,。,,,。4　1)。pH、,。2),pH10、70℃、30min200r/min,,0.5μg/mL,99.99%,GB8978-1996。3),,0.1%,;。[1]DoyleJD,ParsonsSA.Struviteformation,controlandrecovery[J].WaterResearch,2002,36(16):3925-3940.(40)6　　　2011291996,5(3):94-99.[9],,,.[J].,2008,28(3):62-66.[10]NiewiadomskiM,AnhVNguyen,HupkaJ,etal.Airbubbleandoildropletinteractionsincentrifugalfieldsduringair-spargedhydrocycloneflotation[J].Int.J.environmentandPollution,2007,30(2):313-331.[11]MiroslavColic,WadeMorse,JanDMiller.Thedevelopmentandapplicationofcentrifugalflotationsystemsinwastewatertreatment[J].Int.J.EnvironmentandPollution,2007,30(2):296-312.[12]ColicM,LechterA,MorseW,etal.Miller.Thedevelopmentandapplicationofthehybridcentrifugaldissolvedairflotationsystemforwastewatertreatment[C]//PresentedatAmericanFiltrationandSeparationSocietyMeeting.ValleyForge,PA,2008.[13],.[J].,2004,31(5):259-263.[14],,,.[J].,2006,30(1):53-56.[15]LiuShumeng,ZhaoXuefeng,DongXigui,etal.Experimentalre-searchontreatmentofproducedwaterfromapolymer-floodingprocessusingadouble-coneair-spargedhydrocyclone[J].SPEPro-jects,Facilities&Construction,2007(9):1-5.[16]JiangMinghu,ZhaoLixin,SunFuqing,etal.Characteristicre-searchofairinjectedhydrocyclonicseparators[C]//SPE114796,presentationatthe2008SPEAnnualTechnicalConferenceandEx-hibitionheldinDenver.USA,2008.[17],,,.[J].,2006,7(8):86-89.[18]OswaldodeA.Pereira,MarcelVasconcelosMelo,RafaelFerreiradeJesus,etal.Advancesinnon-conventionalflotationforoilywa-tertreatment[J].Filtration,2006,6(1):31-34.[19],,,.[J].,2008,28(4):87-92.[20]SteinEgilOserod.Combineddegassingandflotationtank:UnitedStates,2009/0289002[P],2009-09-26.[21]JahnsenL,VikEA.FieldtrialswithEpcontechnologyforpro-ducedwatertreatment[J].ProducedWaterWorkshop,2003.[22]JefferyJSmith,JeraldWDarlington,JohnOcchipinti,etal.Methodandapparatusforremovinghydrocarbonsfromwater.U-nitedStates,67499757B2[P].2004-06-15.[23]LeeBridson,JeraldWDarlington,JefferyJ.etal.Field-trialre-sultsforproduced-waterpolishingwithnewverticalunitsutilizinglowcentrifugalforcesandinducedgasflotationforcompliancedur-ingproduced-wateroperations[C]//SPE94405,presentationatthe2005SPE/EPA/DOEExplorationandProductionEnvironmen-talConferenceheldinGalveston,Texas.U.S.A,200