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Article: Metal stabilization mechanism of incorporating lead-bearing sludge in kaolinite-based ceramics

TitleMetal stabilization mechanism of incorporating lead-bearing sludge in kaolinite-based ceramics
Authors
KeywordsCrystalline structure
Intermediate phase
Intermediate phasis
Leaching behavior
Leaching test
Issue Date2012
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere
Citation
Chemosphere, 2012, v. 86 n. 8, p. 817-821 How to Cite?
AbstractThe feasibility and mechanism of incorporating simulated lead-laden sludge into low-cost ceramic products was investigated by observing the reaction of lead with two kaolinite-based precursors under sintering conditions. To investigate the phase transformation process of lead, lead oxide (PbO) mixed with a kaolinite or mullite precursor were fired at 500-950°C for 3h. Detailed X-ray diffraction analysis of sintered products revealed that both precursors had crystallochemically incorporated lead into the lead feldspar (PbAl 2Si 2O 8) crystalline structure. By mixing lead oxide with kaolinite, lead feldspar begins to crystallize at 700°C; maximum incorporation of lead into this structure occurred at 950°C. However, two intermediate phases, Pb 4Al 4Si 3O 16 and a polymorph of lead feldspar, were detected at temperatures between 700 and 900°C. By sintering lead oxide with the mullite precursor, lead feldspar was detected at temperatures above 750°C, and an intermediate phase of Pb 4Al 4Si 3O 16 was observed in the temperature range of 750-900°C. This study compared the lead leachabilities of PbO and lead feldspar using a prolonged leaching test (at pH 2.9 for 23d) modified from the toxicity characteristic leaching procedure. The results indicate the superiority of lead feldspar in stabilizing lead and suggest a promising and reliable strategy to stabilize lead in ceramic products. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/150648
ISSN
2015 Impact Factor: 3.698
2015 SCImago Journal Rankings: 1.536
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU 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 (HKU 716310E). The authors are also grateful to Ms. Vicky Fung for assisting us with the atomic absorption analysis.

References
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DC FieldValueLanguage
dc.contributor.authorLu, Xen_US
dc.contributor.authorShih, Ken_US
dc.date.accessioned2012-06-26T06:06:27Z-
dc.date.available2012-06-26T06:06:27Z-
dc.date.issued2012en_US
dc.identifier.citationChemosphere, 2012, v. 86 n. 8, p. 817-821en_US
dc.identifier.issn0045-6535en_US
dc.identifier.urihttp://hdl.handle.net/10722/150648-
dc.description.abstractThe feasibility and mechanism of incorporating simulated lead-laden sludge into low-cost ceramic products was investigated by observing the reaction of lead with two kaolinite-based precursors under sintering conditions. To investigate the phase transformation process of lead, lead oxide (PbO) mixed with a kaolinite or mullite precursor were fired at 500-950°C for 3h. Detailed X-ray diffraction analysis of sintered products revealed that both precursors had crystallochemically incorporated lead into the lead feldspar (PbAl 2Si 2O 8) crystalline structure. By mixing lead oxide with kaolinite, lead feldspar begins to crystallize at 700°C; maximum incorporation of lead into this structure occurred at 950°C. However, two intermediate phases, Pb 4Al 4Si 3O 16 and a polymorph of lead feldspar, were detected at temperatures between 700 and 900°C. By sintering lead oxide with the mullite precursor, lead feldspar was detected at temperatures above 750°C, and an intermediate phase of Pb 4Al 4Si 3O 16 was observed in the temperature range of 750-900°C. This study compared the lead leachabilities of PbO and lead feldspar using a prolonged leaching test (at pH 2.9 for 23d) modified from the toxicity characteristic leaching procedure. The results indicate the superiority of lead feldspar in stabilizing lead and suggest a promising and reliable strategy to stabilize lead in ceramic products. © 2011 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphereen_US
dc.relation.ispartofChemosphereen_US
dc.subjectCrystalline structure-
dc.subjectIntermediate phase-
dc.subjectIntermediate phasis-
dc.subjectLeaching behavior-
dc.subjectLeaching test-
dc.titleMetal stabilization mechanism of incorporating lead-bearing sludge in kaolinite-based 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.chemosphere.2011.11.043en_US
dc.identifier.pmid22197015-
dc.identifier.scopuseid_2-s2.0-84856210272en_US
dc.identifier.hkuros205531-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84856210272&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume86en_US
dc.identifier.issue8en_US
dc.identifier.spage817en_US
dc.identifier.epage821en_US
dc.identifier.isiWOS:000301314400009-
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.citeulike10174311-

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