废弃印刷线路板中铜的两步浸出工艺优化王莉莉

121Vol．12No．120181ChineseJournalofEnvironmentalEngineeringJan．2018BK20161497309170113082017－05－182017－09－041993—。[e-mail]*[e-mail]11*22221．2100942．210094-WPCBsWPCBs。553.43r·min－1、42.57℃、20.23g·L－1、1.80mm100.08%。“”0.98。WPCBs60g·L－1。X705A1673-9108201801-0250-09DOI10.12030/j．cjee．201705115Optimizationoftwo-stepleachingofcopperfromwasteprintedcircuitboardWANGLili1SUNXiuyun1*LIQiao2SUNXiaolei2LIYi2WANGLianjun21．SchoolofEnvironmentalandBiologicalEngineeringNanjingUniversityofScienceandTechnologyNanjing210094China2．JiangsuKeyLaboratoryofChemicalPollutionControlandＲesourcesＲeuseNanjing210094ChinaAbstractMetalswererecoveredfromwasteprintedcircuitboardsWPCBsbychemical-biologicaltwo-stepleachingprocess．SteelpicklingwastewaterwasusedasaleachingagentforchemicalleachingandsubsequentbioleachingwasperformedusingtheAcidithiobacillusferrooxidansasleachingmicroorganisms．TheinfluencingfactorsofcopperleachingrateinWPCBsandironremovalrateinsteelpicklingwastewaterwereinvestigated．Theresponsesurfacemethodologywasemployedtooptimizetheleachingparameters．Theoptimumleachingcon-ditionsweredeterminedasrotatingspeedof553.43r·min－1temperatureof42.57℃dosageof20.23g·L－1particlesizeof1.80mmandtheleachingrateofcopperwasfoundtobe100.08%．Thekineticmodelofcopperleachingconformedtothe“shrinkagekineticsmodel”ofliquid-solidreactioninhydrometallurgyandthecorrelationcoefficientcanreachabove0.98．BioleachingexperimentsshowedthatthedosageofWPCBshadagreateffectonthetoxicityofAcidithiobacillusferrooxidansandhadastronginhibitoryeffectoncopperleachingandironremoval．Theexperimentshowedthattheoptimumdosagewas60g·L－1．Keywordswasteprintedcircuitboardssteelpicklingwastewatermetalleachingironremovalresponsesur-facemethodology1。printedcircuitboardsPCBs。、wasteprintedcircuitboardsWPCBs2。、3。、。14。、、56。。FLVIA7-WPCBsZn、Al、SnCuCuZn、AlSnBIＲLOAGA8WPCBsAuAgAuAg239-Cu8d98.26%41.92%27.31%。。-。WPCBsZn、Pb、AlSn。WPCBs。-7WPCBs。WPCBsZn、Pb、Al、SnCu。11.1。FW-400A1016。WPCBs11ICP-OES1。1Table1Metalpercentageinwasteprintedcircuitboards%CuZnPbAlFeSnNiMgMnAgSb24.973.522.602.321.891.030.260.130.0160.0070.0020.22μmWPCBs。2。2Table2Compositionofpicklingwastewaterg·L－1189.503.790.300.100.04252.59。Acidithiobacillusferroox-idansATCC23270A．f。9KNH42SO43.00g·L－1KCl0.10g·L－1K2HPO40.50g·L－1MgSO4·7H2O0.50g·L－1CaNO320.01g·L－1FeSO4·7H2O44.6g·L－1。Cl－、、WPCBs12。1.21.2.1A．fCl－、、WPCBs。10%15212Cl－0～9g·L－12g·L－1Cl－。10%Cl－2g·L－1Cl－。、WPCBs。Cl－1∶1H2SO4pH2.0。180r·min－130℃13。3、Table3FactorslevelsandcodeschosenforＲSM－10+1A/r·min－1200400600B/℃253545C/g·L－12060100D/mm0.451.232.004Table4ExperimentalresultsofＲSMABCD/%10－10113.07200－1183.75300002.374001－115.12500113.9860－1－10100700－1－110080－10－139.92900002.37101－10010.2111100－138.6312－11003.5713110037.741400002.371501102.48160－1101.9817－100－143.741800002.371910－101002010101.542110019.6822－1－1001.952301012.612400003.5325－10－1097.3326－10102.742701－1010028010－141.8429－10011.851.2.2、、414Box-Behnken2915WPCBsWPCBs。34。1.2.312.00g250mL200mL30℃600r·min－1。1、2、3、6、12、24、48、72、96120h0.22μmCu2+1。X=0.2Ct12×1000w×100%1X%CttCu2+mg·L－1wWPCBsCu%。1.2.45d5mol·L－1NaOHpH1.510%180r·min－130℃。10d15dCu2+Fe。22.1Cl－A．fCl－、、WPCBsCl－。Cl－。1Cl－。NICHOLAS16。1Cl－Fe2+。9g·L－1Fe2+25211Cl－ATCC23270Fig．1EffectofCl－onoxidationreductionpotentialbyATCC23270。ATCC23270Cl－7g·L－1。17Cl－3g·L－1。Cl－。2A．fCl－Cl－Cl－。7g·L－1Cl－397mV。2ATCC23270Cl－72hFig．2ComparisonofoxidationreductionpotentialofATCC23270beforeandafterchlorine-tolerantdomestication72h5.2172h。、WPCBs5WPCBs60g·L－1AＲ-SHADI10WPCBs20g·L－1。A．f。2.22.2.1Design-Expert8.05418=2.60+3.8A+1.76B－46.10C－13.69D+6.48AB－0.97AC+3.23AD+0.13BC－3.10BD+1.28CD+6.75A2+7.55B2+39.24C2+12.40D2Ｒ2=0.974。5、、＞＞＞。2.2.23～8。。3＞520r·min－1、40.0～45.0℃。4＜20g·L－1。5＞440r·min－1、0.45～0.84mm。6＜20g·L－1。70.45～0.84mm。8＜20g·L－1、0.45～0.84mm。、、WPCBs、。WPCBs。WPCBsWPCBs。WPCBs。19235212WPCBs。Fe3++Cu→Fe2++Cu2+25Box-BehnkenTable5ANOVAforfittedBox-BehnkenmodelFP1438404.32743.1736.68＜0.0001A1181.12181.122.420.1420B137.1437.140.500.4926C125506.225506.2341.07＜0.0001D12249.812249.8130.08＜0.0001AB1167.83167.832.240.1563AC13.743.740.0500.8262AD141.8641.860.560.4667BC10.0630.0630.0010.9773BD138.3238.320.510.4859CD16.536.530.0870.7720A21295.49295.493.950.0668B21369.57369.574.940.0432C219988.729988.72133.57＜0.0001D21997.47997.4713.340.0026141046.9574.782839451.3P＜0.01P＜0.05。3-Fig．3Contourandsurfaceplotsforeffectofrotatingspeedandtemperature6Table6Pointpredictionandverificationofmodelsatoptimumconditions/%/%95%100.08100.0083.13117.032.2.3Box-BehnkenBBDWPCBs=553.43r·min－1、=42.57℃、=20.23g·L－1、=1.80mm6100.08%。45214-Fig．4Contourandsurfaceplotsforeffectofrotatingspeedanddosage5-Fig．5Contourandsurfaceplotsforeffectofrotatingspeedandparticlesize6-Fig．6Contourandsurfaceplotsforeffectoftemperatureanddosage7-Fig．7Contourandsurfaceplotsforeffectoftemperatureandparticlesize552128-Fig．8Contourandsurfaceplotsforeffectofdosageandparticlesize100%95%10。2.3Zn、Pb、AlSn72hWPCBs。“”203～53211－2/3x－1－x2/3=kdt31－1－x1/3=krt41－31－x2/3+21－x=kt5xkd、kr、k。3。4。5。9Fig．9Kineticfittingcurveincopperleachingprocess9373。130.98。WPCBsWPCBs