热镀锌钢板生产概述第十四讲生产热镀锌的环保问题及三废处理

()(),,,BriefIntroductionoftheProductionofHotGalvanizedSteelSheetLecture14EnvironmwntalProblemsandWasteTreatmentinHotGavanizingProductionZhuLiSongBo(AISCTechnologyCentre)(AnshanIronandSteelInstitute)AbstractThecertainwastegas,wasteliquid,andwasteslagmaybegeneratednomatterwhatkindofmethodintheprocessofhotgalvaniingplateproduction.Thesecanpollutetheenvironmentandhaveaneffectonopertorstoacertainextent.Thereasonsandtreatedmeasuresareintroduced.Keywordshotgalvanizedwastegaswasteliquidwasteslag11.1,,114001(1),(2),2620005(50mgökg,340mgökg,6mgökg,2.22.8g),:3.5g,510g,,,1.2(),,1.3,,,;,(Fe2Al5),,,FeZn7,2,,,,,,3,,,,,3.1,,,,,3.2,(15%20%),10%,20%,,,,,36,,,3.2.1,,,(1),,(FeSO4õ7H2O),,,Fe2++SO2-4+7H2OWFeSO4õ7H2O;Fe2+,FeSO4õ7H2O,FeSO4õ7H2O(2),(Fe2+SO2-4)(H+),,(3)(1),,FeSO4õ7H2O,,FeSO4õ7H2O,(10%20%),(4),,,,(5)(),,,,pH7,3.2.2,(1)(),,,(2),,Fe(OH)3,,(3),Fe2+Fe3+,Fe3+(Cl2),Fe3+:Fe+2Fe3+3Fe2+,,Fe2+3.2.34620005,,,pH,68,3.33.3.1,,,Cr2O2-4Cr2O2-7Cr3+,Fe2+Zn2+,732,CrO2-4Cr2O2-7,3.3.2Cr6+0.5mgöl,,:Cr6+,:,:3Fe2++Cr6+Cr3++3Fe3+3SO2-3+2Cr6+2Cr3++3SO2-4:Cr3+,Cr3+Cr3+,Cr3+Fe2+Fe3+Zn2+,:Cr2(SO4)3+3Ca(OH)22Cr(OH)3+3CaSO4Fe2(SO4)3+3Ca(OH)22Fe(OH)3+3CaSO4FeSO4+Ca(OH)2Fe(OH)2+CaSO4ZnSO4+Ca(OH)2Zn(OH)2+CaSO4,,3.4,,,(PO-34)(F-)Fe2+Zn2+,2F-+Ca2+CaF2,,,3.5,,,,:(,);,,,,,,,,,,pH,56:,pH56():12FeCl2+6H2O28FeCl3+4Fe(OH)3FeCl3+3H2OFe(OH)3+3HClpH,56,,4,,11,kgöt,kgöt,kgöt792.50.317171.82.5,,4.150%,,,,,900,,,,4.2FeZn7,FeZn789%,95%,,,(),(1),,,,(2),,,,1000,,,,,()():2000386620005