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Article: Phase transformation and its role in stabilizing simulated lead-laden sludge in aluminum-rich ceramics

TitlePhase transformation and its role in stabilizing simulated lead-laden sludge in aluminum-rich ceramics
Authors
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2011, v. 45 n. 16, p. 5123-5129 How to Cite?
AbstractThis study investigated the mechanisms of stabilizing lead-laden sludge by blending it into the production process of aluminum-rich ceramics, and quantitatively evaluated the prolonged leachability of the product phases. Sintering experiments were performed using powder mixtures of lead oxide and γ-alumina with different Pb/Al molar ratios within the temperature range of 600-1000 °C. By mixing lead oxide with γ-alumina at a Pb/Al molar ratio of 0.5, the formation of PbAl 2O 4 is initiated at 700 °C, but an effective formation was observed when the temperature was above 750 °C for a 3-h sintering time. The formation and decomposition of the intermediate phase, Pb 9Al 8O 21, was detected in this system within the temperature range of 800-900 °C. When the lead oxide and γ-alumina mixture was sintered with a Pb/Al molar ratio of 1:12, the PbAl 12O 19 phase was found at 950 °C and effectively formed at 1000 °C. In this system, an intermediate phase Pb 3(CO 3) 2(OH) 2 was observed at the temperature range of 700-950 °C. Over longer leaching periods, both PbAl 2O 4 and PbAl 12O 19 were superior to lead oxide in immobilizing lead. Comparing the leaching results of PbAl 2O 4 and PbAl 12O 19 demonstrated the higher intrinsic resistance of PbAl 12O 19 against acid attack. To reduce metal mobility, this study demonstrated a preferred mechanism of stabilizing lead in the aluminate structures by adding metal-bearing waste sludge to the ceramic processing of aluminum-rich products. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/150596
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong (gs1)HKU 716310E
Funding Information:

We gratefully acknowledge the funding for this research provided by the General Research Fund Scheme of the Research Grants Council of Hong Kong (gs1) (HKU 716310E). The authors are also grateful to Ms. Vicky Fung for assisting us with the atomic absorption analysis.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorLu, Xen_US
dc.contributor.authorShih, Ken_US
dc.date.accessioned2012-06-26T06:06:01Z-
dc.date.available2012-06-26T06:06:01Z-
dc.date.issued2011en_US
dc.identifier.citationWater Research, 2011, v. 45 n. 16, p. 5123-5129en_US
dc.identifier.issn0043-1354en_US
dc.identifier.urihttp://hdl.handle.net/10722/150596-
dc.description.abstractThis study investigated the mechanisms of stabilizing lead-laden sludge by blending it into the production process of aluminum-rich ceramics, and quantitatively evaluated the prolonged leachability of the product phases. Sintering experiments were performed using powder mixtures of lead oxide and γ-alumina with different Pb/Al molar ratios within the temperature range of 600-1000 °C. By mixing lead oxide with γ-alumina at a Pb/Al molar ratio of 0.5, the formation of PbAl 2O 4 is initiated at 700 °C, but an effective formation was observed when the temperature was above 750 °C for a 3-h sintering time. The formation and decomposition of the intermediate phase, Pb 9Al 8O 21, was detected in this system within the temperature range of 800-900 °C. When the lead oxide and γ-alumina mixture was sintered with a Pb/Al molar ratio of 1:12, the PbAl 12O 19 phase was found at 950 °C and effectively formed at 1000 °C. In this system, an intermediate phase Pb 3(CO 3) 2(OH) 2 was observed at the temperature range of 700-950 °C. Over longer leaching periods, both PbAl 2O 4 and PbAl 12O 19 were superior to lead oxide in immobilizing lead. Comparing the leaching results of PbAl 2O 4 and PbAl 12O 19 demonstrated the higher intrinsic resistance of PbAl 12O 19 against acid attack. To reduce metal mobility, this study demonstrated a preferred mechanism of stabilizing lead in the aluminate structures by adding metal-bearing waste sludge to the ceramic processing of aluminum-rich products. © 2011 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_US
dc.relation.ispartofWater Researchen_US
dc.subject.meshAcid attacken_US
dc.subject.meshCeramic processingen_US
dc.subject.meshIntermediate phaseen_US
dc.subject.meshIntrinsic resistanceen_US
dc.subject.meshLeachability-
dc.titlePhase transformation and its role in stabilizing simulated lead-laden sludge in aluminum-rich ceramicsen_US
dc.typeArticleen_US
dc.identifier.emailShih, K: kshih@hku.hken_US
dc.identifier.authorityShih, K=rp00167en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.watres.2011.07.015en_US
dc.identifier.pmid21813152-
dc.identifier.scopuseid_2-s2.0-80052260701en_US
dc.identifier.hkuros205545-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80052260701&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume45en_US
dc.identifier.issue16en_US
dc.identifier.spage5123en_US
dc.identifier.epage5129en_US
dc.identifier.eissn1879-2448-
dc.identifier.isiWOS:000295386800041-
dc.publisher.placeUnited Kingdomen_US
dc.relation.projectSpinel Formation in Recycling Sludge-Incineration Ash for Fabrication of Ceramic Materials-
dc.identifier.scopusauthoridShih, K=14072108900en_US
dc.identifier.scopusauthoridLu, X=34168040600en_US
dc.identifier.citeulike9623201-

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