低COD处理沉钒废水回收低铁含铬渣冶炼金属铬滕晓慧

櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿櫿氄氄氄氄COD121005、COD2878mg/L、COD、。3．1～3．215～30min。COD65mg/L《》DB21/1627—2008Fe2O30．27%Cr2O341．6%。、JCr95Cr≥95%。CODTF841．3X756A1004－7638201602－0073－05DOI10．7513/j．issn．1004－7638．2016．02．013SmeltingChromiumUsingLowIronChromium-containingSlaginTreatmentofVanadiumPrecipitationWastewaterwithLowCODTengXiaohuiZhuangLijunLiWenhuiCITICJinzhouMetalCo．LtdJinzhou121005LiaoningChinaAbstractVanadiumprecipitationwastewaterwastreatedseparatelyusingsupernatantofsodiumthiosulfatesolutionandsodiummetabisulfitebutCODofthewastewaterreducedbytheformerwasashighas2878mg/Lfarexceedingtheemissionstandards．WastewaterwithalowerCODandchromium-containingslagwithlowironcontentcanbeobtainedbysodiummetabisulfitereductionneutralizationandprecipitationforthevanadiumprecipitationwastewater．Industrialoperatingconditionsfortreatmentofvanadiumprecipitati-onwastewaterwithsodiummetabisulfiteareproposedasfollowsadditionamountofsodiummetabisulfiteis3．1～3．2timesasmuchasCr6+contentinthewastewaterwith15～30minofreductiontime．Throughammoniaremovalforthewastewaterafterthetreatmentmentionedabovenohexavalentchromiumisdetec-tedinthewaterdischargedtothesewagetreatmentplantwith65mg/LofaverageCODvaluesatisfyingtheemissionlimitsofLiaoningprovincelocalstandard“IntegratedWastewaterDischargeStandard”DB21/1627－2008．Meanwhileslagwithlowironcontent0．27%calculatedasFe2O3andhighcontentofchromium41．6%calculatedasCr2O3canbeobtained．Afterroastingthechromium-contai-ningslagqualifiedchromiumJCr95Cr≥95%canbeproducedbyoutfurnacesmelting．KeywordsvanadiumprecipitationwastewatersupernatantofsodiumthiosulfatesodiummetabisulfitereductionCODchromium-containingslagchromiummetal2016－01－291980—、、。37220164IＲONSTEELVANADIUMTITANIUMVol．37No．2April20160、、10．3～2．5g/L0．1～0．4g/LⅥ、Ⅴ。－、、、、、、ⅥⅤⅢⅣ、、ⅢⅣ、、2－4Ⅵ、Ⅴ。2015COD。、、COD+、、Fe2O3≥4．5%。、CODJCr95Cr≥95%。11．11CrⅥ1．87g/LVⅤ0．15g/LpH2．5。2、、Na2S2O3199．0g/LNaOH9．4g/LCrⅥ0．05g/L。Na2S2O5。3。1．2、、JJ－1A、DB－3B、SHB-IIIA、。500mL50～55℃10～30min、10～15minpH7～9、。22．1COD1．14Na2S2O31．14。Na2S2O3COD1、2。1+Table1TheconditionsfortreatmentofvanadiumprecipitationwastewaterwithsupernatantofsodiumthiosulfatesolutionandexcessivesulfuricacidNa2S2O3/mL·L－1/℃/minpH/min/g·L－113．54050±530＜＜0．51089．624．04050±530＜＜0．51086．834．54050±530＜＜0．51088．045．04050±530＜＜0．51087．02、、COD＞1800mg/LNa2S2O34．5·47·201637。Na2S2O35．0COD2878mg/L《》DB21/1627—2008。2+CODTable2CODconcentrationofthetreatedvanadiumprecipitationwastewaterwithsupernatantofsodiumthiosulfatesolutionandexcessivesulfuricacidNa2S2O3COD/mg·L－1CrⅥ/mg·L－1pH13．51813146．88．0424．0214293．08．3634．5230342．08．2845．02878NA8．13NACOD。2．2COD2．742．74。3。≤3．0＞＞0．5mg/L3．1～3．3＜＜0．5mg/LCOD339mg/LCOD300mg/LCOD《》DB21/1627—2008。3Table3Theconditionsfortreatmentofvanadiumprecipitationwastewaterwithsodiummetabisulfite/mL·L－1/℃/minpH/min/g·L－113．1050±5103．51011．423．1050±5203．51011．033．1250±5102．01016．043．2050±5103．01010．453．2250±5102．51016．063．3050±5103．51010．873．3250±5102．51015．7、COD1。1CODFig．1CODofwastewatertreatedwithdifferentsodiummetabisulfiteaddition1CODCOD、1～3、CODCOD。Na2S2O5+H2O→2HSO3－+2Na+13HSO3－+Cr2O72－+5H+→3SO42－+2Cr3++4H2O2HSO3－+2VO2++H+→SO42－+2VO2++H2O3、COD·57·2COD。3．1～3．3Fe2O30．27%Cr2O327．9%V2O53．1%。Fe2O31%、CrOH3、Cr2O3JCr95Cr≥95%。33．13．1～3．23．115～30minpHpH6．5～7．5。、、pH、4。4CODTable4CODconcentrationofvanadiumprecipitationwastewaterbyindustrialtreatmentwithsodiummetabisulfitemg/LCrⅥCODCrⅥ1219032NA22149195NA3213256NA4217697NA5207424NA6234925NA72264107NA8207720NA9199966NA10193532NA213565NANA。4《》DB21/1627—2008。COD40m3、、pH、5、、CODCOD。Fe2O30．07%Cr2O341．6%V2O52．9%H2O65．1%SiO27．6%Fe2O31%。、、Cr2O3JCr95Cr≥95%。3．2JCr95500JCr955。、6．6%2．5%1150～1400℃、2～4h、90%～100%。5Table5Themainchemicalcompositionsofchromiummetalsmeltedwithchromium-containingslag%AlCrFeSi10．0496．600．261．7020．0595．510．502．1730．0495．840．482．2440．0496．010．482．1050．0495．540．342．2560．0595．130．472．7270．0495．660．442．200．0495．760．422．2041COD2878mg/L·67·201637COD。2。3．1～3．215～30minCOD65mg/L《》DB21/1627—2008。1HuangDaoxin．VanadiumextractionandsteelrefiningM．BeijingMetallurgicalIndustryPress200055－72．．M．200055－72．2ZhuangLijunWangLiangZhaoHuaetal．TreatmentofreducedwastewateraftervanadiumprecipitationwithleanslagfromferrovanadiumsmeltingJ．IronSteelVanadiumTitanium201435164－68．．J．201435164－68．3WangYing．CurrentSituationofthevanadiumprecipitatingwastewatertreatmenttechnologyJ．Ferro-alloys20126141－45．．J．20126141－45．4CaiJingyuan．InvestigationonpurificationandrecoverytechniquesforwastewatercontainingvanadiumJ．ShanghaiMetalsNonferrousFascicule199213612－14．．J．199213612－14．5TengXiaohui．Scalingreasonsandmeasuresfromammonia-nitrogenwastewaterofprecipitatingvanadiuminammonia-removingtowerwithsteamstrippingJ．IronSteelVanadiumTitanium201536148－51．．J．201536148－51．櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵櫵2015Tronox2015。201521．12201417．37EBITDA、、2．7220143．53。201515．10201417．3713%EBITDA2．1520144．37。201520144%。Tronox·77·2COD