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375201110Vol.37No.5MetalProductsOctober2011doi10．3969/j．issn．1003－4226．2011．05．019pH257500、、、pH、pH。pHpH。pH8．5～9．0pH≥9．0、、、。pHX703ApplicationofpHcontrolintheprocessofsteelcord’swastewatertreatmentWANGCui-cuiHANLeiShandongSNTONSteelCordCo．Ltd．Dongying257500ChinaAbstractThewastewaterdischargedbysteelcordproductioncontainsplentyofheavymetalionslikeleadcopperzincironetc．DuringtheprocessofwastewatertreatmenttherearegapsamongtheoptimumprecipitationpHoftheoreticalcal-culationcompleteprecipitationpHandactualvaluesdifferencebetweenredissolvingphenomenonofamphotericmetalandtheoreticalvaluesanduncertaintyininjectedvolumeofalkalinematerials．TakingtheacidicwastewaterdischargedbytheelectroplatingworkshopastestobjectandusingsodiumhydroxidesolutiontocontrolthepHofsolutionstoanalyzetherela-tionshipbetweenpHcontrolandtheamountofresidualimpuritieswhentreatingelectroplatingwastewaterwithchemicalpre-cipitationmethod．ThroughexperimenttestandtheoreticalcalculationfinallyobtainingthefollowingconclusionswhenthepHis8．5～9．0theconcentrationsofdifferentmetalionsinthesupernatantmeetthenationalstandardwhenthepH≥9．0theheavymetalionssuchasleadcopperzincironetc．havecompletelyprecipitated．KeywordssteelcordelectroplatingwastewaterchemicalprecipitationmethodpHcontrol211。。10002。、。。ρPb2+0．5mg/LρZn2+2．0mg/LρCu2+0．5mg/LρFe2+Fe3+、、、。14、、、。。90%40%3。。pH。1pH、pH23。37pHpH4。22．1ICPPHS－2C。100mL、20%pHpH、ICP。2．2pH0．9～1．01。1Table1Metalion’smassconcentrationinsludgewatermg/LρCu2+ρFe2+Fe3+ρPb2+ρZn2+14．031197．5912．9731．782．3pH=14－1nlgMen+－lgKsp11nMen+Ksp5。11pHpHMen+10－5mol/L2。2pHTable2Metalion’spHinthetimeofbeginningtoprecipitateandcompletelyprecipitateCuOH2FeOH2FeOH3PbOH2ZnOH26．007．292．098．647．206．678．953．209．048．042．4ICPR0．999。pH、3pH1、2。3pH、Table3TestingresultofNaOHliquidamountwithcleanliquidanditsmetalionmassconcentrationNaOH/mLpH/mg·L－1ρCu2+ρFe2+Fe3+ρPb2+ρZn2+10．01．014．031197．5912．9731．7822．65．85．07748．850．0221．2232．76．21．27658．630．0011．7742．86．50．90525．030．006．8952．97．00．18449．400．003．0763．07．50．12154．220．000．7173．18．50．0310．690．000．0483．29．00．041．780．000．0293．39．80．020．320．000．01103．39．90．020．210．000．00114．111．00．020．120．000．01124．511．70．000．000．000．05135．012．10．010．000．000．14145．312．70．010．000．001．62155．512．80．000．000．002．13166．013．30．000．070．399．74176．113．40．010．080．459．47·47·5pH33．1pH。Fe2+Fe3+pHFeOH3。Fe3+pH2～3pH3～7pH=7FeOH2FeOH3。pH=92。2Cu2+Pb2+Zn2+pH3。3．2pH。pHNaOHpH。pH4pH＞12PbZn6。pH8．5～9．0pH≥9．0、、、pH6～9。pH。。4pHpH。pH8．5～9．0pH≥9．0、、、。、。。。1．J．20076340－343．2．J．2008639．3．J．2004269－71．4．J．1996222－23．5．M．2008425－426．6．pHJ．200818－10．2011－08－021983。1982。·57·