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Article: Evaluation of the Effectiveness of Cd Stabilization by a Low-temperature Sintering Process with Kaolinite/Mullite Addition

TitleEvaluation of the Effectiveness of Cd Stabilization by a Low-temperature Sintering Process with Kaolinite/Mullite Addition
Authors
KeywordsCd-laden industrial sludge
Kaolinite
Mullite
Cadmium aluminate silicates
Cadmium silicates
Issue Date2019
PublisherElsevier Ltd. The Journal's web site is located at https://www.journals.elsevier.com/waste-management/
Citation
Waste Management , 2019, v. 87, p. 814-824 How to Cite?
AbstractThis study first examined the phase transformation in the reactive sintering systems of cadmium-laden industrial sludge and Al-Si-rich precursors with different Cd/Al/Si molar ratios under various temperatures. X-ray diffraction results indicated that the Cd started to be incorporated at 750 °C by kaolinite or mullite (calcined from kaolinite). Three hours of processing at 950 °C can effectively incorporate Cd into Cd-Al-Si or Cd-Si materials. The amount of CdO in the reactive systems had significant influences on the Cd incorporation behavior into crystalline phases. With a small amount of CdO, product phase CdAl2Si2O8 dominated in the systems. Systems with considerable CdO produced notable amounts of Cd2SiO4 and Cd3SiO5. The production of Cd2SiO4 and Cd3SiO5 from CdO + mullite was more significant than that using kaolinite due to the preferred reaction between CdO and SiO2. To assess the effect of metal stabilization, single-phase products that host Cd (namely, CdAl2Si2O8, Cd2SiO4, and Cd3SiO5) were obtained, maintained at pH 4.0, and subjected to a constant-pH leaching test (CPLT) for 120 min. CPLT results evidently indicated that these phases were remarkably resistant to substantial acid (nitric acid) attack; the leaching behavior of CdAl2Si2O8 was incongruent dissolution. Finally, cadmium can be effectively incorporated into CdAl2Si2O8, Cd2SiO4, or Cd3SiO5 by using sludge ash from a secondary sewage treatment works, suggesting that precursors enriched with Al and Si can be promising materials in a cleaner production process for treating cadmium-laden industrial sludge.
Persistent Identifierhttp://hdl.handle.net/10722/274875
ISSN
2019 Impact Factor: 5.448
2015 SCImago Journal Rankings: 1.764
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSu, M-
dc.contributor.authorLiao, C-
dc.contributor.authorChen, D-
dc.contributor.authorShih, K-
dc.contributor.authorKong, L-
dc.contributor.authorTang, J-
dc.contributor.authorZhang, H-
dc.contributor.authorSong, G-
dc.date.accessioned2019-09-10T02:30:41Z-
dc.date.available2019-09-10T02:30:41Z-
dc.date.issued2019-
dc.identifier.citationWaste Management , 2019, v. 87, p. 814-824-
dc.identifier.issn0956-053X-
dc.identifier.urihttp://hdl.handle.net/10722/274875-
dc.description.abstractThis study first examined the phase transformation in the reactive sintering systems of cadmium-laden industrial sludge and Al-Si-rich precursors with different Cd/Al/Si molar ratios under various temperatures. X-ray diffraction results indicated that the Cd started to be incorporated at 750 °C by kaolinite or mullite (calcined from kaolinite). Three hours of processing at 950 °C can effectively incorporate Cd into Cd-Al-Si or Cd-Si materials. The amount of CdO in the reactive systems had significant influences on the Cd incorporation behavior into crystalline phases. With a small amount of CdO, product phase CdAl2Si2O8 dominated in the systems. Systems with considerable CdO produced notable amounts of Cd2SiO4 and Cd3SiO5. The production of Cd2SiO4 and Cd3SiO5 from CdO + mullite was more significant than that using kaolinite due to the preferred reaction between CdO and SiO2. To assess the effect of metal stabilization, single-phase products that host Cd (namely, CdAl2Si2O8, Cd2SiO4, and Cd3SiO5) were obtained, maintained at pH 4.0, and subjected to a constant-pH leaching test (CPLT) for 120 min. CPLT results evidently indicated that these phases were remarkably resistant to substantial acid (nitric acid) attack; the leaching behavior of CdAl2Si2O8 was incongruent dissolution. Finally, cadmium can be effectively incorporated into CdAl2Si2O8, Cd2SiO4, or Cd3SiO5 by using sludge ash from a secondary sewage treatment works, suggesting that precursors enriched with Al and Si can be promising materials in a cleaner production process for treating cadmium-laden industrial sludge.-
dc.languageeng-
dc.publisherElsevier Ltd. The Journal's web site is located at https://www.journals.elsevier.com/waste-management/-
dc.relation.ispartofWaste Management-
dc.subjectCd-laden industrial sludge-
dc.subjectKaolinite-
dc.subjectMullite-
dc.subjectCadmium aluminate silicates-
dc.subjectCadmium silicates-
dc.titleEvaluation of the Effectiveness of Cd Stabilization by a Low-temperature Sintering Process with Kaolinite/Mullite Addition-
dc.typeArticle-
dc.identifier.emailLiao, C: liaocz@HKUCC-COM.hku.hk-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.wasman.2019.03.001-
dc.identifier.pmid31109586-
dc.identifier.scopuseid_2-s2.0-85062899544-
dc.identifier.hkuros303611-
dc.identifier.volume87-
dc.identifier.spage814-
dc.identifier.epage824-
dc.identifier.isiWOS:000470947700081-
dc.publisher.placeUnited Kingdom-

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