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Article: Formation of copper aluminate spinel and cuprous aluminate delafossite to thermally stabilize simulated copper-laden sludge

TitleFormation of copper aluminate spinel and cuprous aluminate delafossite to thermally stabilize simulated copper-laden sludge
Authors
KeywordsAlumina
Copper
Kaolinite
Sludge
Spinel
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhazmat
Citation
Journal Of Hazardous Materials, 2010, v. 181 n. 1-3, p. 399-404 How to Cite?
AbstractThe study reported herein indicated the stabilization mechanisms at work when copper-laden sludge is thermally treated with γ-alumina and kaolinite precursors, and evaluated the prolonged leachability of their product phases. Four copper-containing phases - copper oxide (CuO), cuprous oxide (Cu2O), copper aluminate spinel (CuAl2O4), and cuprous aluminate delafossite (CuAlO2) - were found in the thermal reactions of the investigated systems. These phases were independently synthesized for leaching by 0.1M HCl aqueous solution, and the relative leachabilities were found to be CuAl2O4
Persistent Identifierhttp://hdl.handle.net/10722/129133
ISSN
2015 Impact Factor: 4.836
2015 SCImago Journal Rankings: 1.692
ISI Accession Number ID
Funding AgencyGrant Number
Singapore Stanford Partnership
University of Hong Kong
Funding Information:

The Alcoa Corporation is acknowledged for providing HiQ (R)-7223 alumina. We would also like to thank the supports from the Singapore Stanford Partnership and University of Hong Kong Seed Funding.

References

 

DC FieldValueLanguage
dc.contributor.authorHu, CYen_HK
dc.contributor.authorShih, Ken_HK
dc.contributor.authorLeckie, JOen_HK
dc.date.accessioned2010-12-23T08:32:53Z-
dc.date.available2010-12-23T08:32:53Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Hazardous Materials, 2010, v. 181 n. 1-3, p. 399-404en_HK
dc.identifier.issn0304-3894en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129133-
dc.description.abstractThe study reported herein indicated the stabilization mechanisms at work when copper-laden sludge is thermally treated with γ-alumina and kaolinite precursors, and evaluated the prolonged leachability of their product phases. Four copper-containing phases - copper oxide (CuO), cuprous oxide (Cu2O), copper aluminate spinel (CuAl2O4), and cuprous aluminate delafossite (CuAlO2) - were found in the thermal reactions of the investigated systems. These phases were independently synthesized for leaching by 0.1M HCl aqueous solution, and the relative leachabilities were found to be CuAl2O4<CuAlO2≪≪Cu2O<CuO. The sintering condition and formation mechanism employed to stabilize copper into CuAl2O4 and CuAlO2 are extensively discussed here. With a 3h of short sintering, it was found that CuAl2O4 could be effectively formed between 850 and 950°C by the γ-alumina precursor. Although kaolinite had a lower incorporation capability than γ-alumina, it was found to transform a considerable amount of copper into CuAl2O4 between 950 and 1000°C. At higher temperatures, CuAlO2 was produced only in the γ-alumina system as the occurrence of Cu2O-cristobalite solution in the kaolinite system precluded the production of CuAlO2. The hypothesis that the spinel formation mechanism has two stages was supported by the results of the changing Cu/Al mole ratio in the system, and the rate-limiting step was identified as the diffusion process in the second stage. © 2010 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhazmaten_HK
dc.relation.ispartofJournal of Hazardous Materialsen_HK
dc.subjectAluminaen_HK
dc.subjectCopperen_HK
dc.subjectKaoliniteen_HK
dc.subjectSludgeen_HK
dc.subjectSpinelen_HK
dc.subject.meshAluminum Oxide - chemistry-
dc.subject.meshCopper-
dc.subject.meshHot Temperature-
dc.subject.meshMagnesium Oxide - chemistry-
dc.subject.meshSewage - chemistry-
dc.titleFormation of copper aluminate spinel and cuprous aluminate delafossite to thermally stabilize simulated copper-laden sludgeen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0304-3894&volume=181&issue=1-3&spage=399&epage=404&date=2010&atitle=Formation+of+copper+aluminate+spinel+and+cuprous+aluminate+delafossite+to+thermally+stabilize+simulated+copper-laden+sludge+-
dc.identifier.emailShih, K:kshih@hkucc.hku.hken_HK
dc.identifier.authorityShih, K=rp00167en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jhazmat.2010.05.024en_HK
dc.identifier.pmid20570043-
dc.identifier.scopuseid_2-s2.0-77954542829en_HK
dc.identifier.hkuros178463en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77954542829&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume181en_HK
dc.identifier.issue1-3en_HK
dc.identifier.spage399en_HK
dc.identifier.epage404en_HK
dc.identifier.isiWOS:000280601300051-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridHu, CY=23492617300en_HK
dc.identifier.scopusauthoridShih, K=14072108900en_HK
dc.identifier.scopusauthoridLeckie, JO=7006717360en_HK

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