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dc.contributor.authorKong, Xiangfeng
dc.contributor.authorLi, Meng
dc.contributor.authorXue, Shengguo
dc.contributor.authorHartley, William
dc.contributor.authorChen, Chengrong
dc.contributor.authorWu, Chuan
dc.contributor.authorLi, Xiaofei
dc.contributor.authorLi, Yiwei
dc.date.accessioned2017-06-23T03:06:04Z
dc.date.available2017-06-23T03:06:04Z
dc.date.issued2017
dc.identifier.issn0304-3894
dc.identifier.doi10.1016/j.jhazmat.2016.10.073
dc.identifier.urihttp://hdl.handle.net/10072/340767
dc.description.abstractBauxite residue (BR) is a highly alkaline solid hazardous waste produced from bauxite processing for alumina production. Alkaline transformation appears to reduce the environmental risk of bauxite residue disposal areas (BRDAs) whilst potentially providing opportunities for the sustainable reuse and on-going management of BR. Mineral acids, a novel citric acid and a hybrid combination of acid-gypsum treatments were investigated for their potential to reduce residue pH and total alkalinity and transform the alkaline mineral phase. XRD results revealed that with the exception of andradite, the primary alkaline solid phases of cancrinite, grossular and calcite were transformed into discriminative products based on the transformation used. Supernatants separated from BR and transformed bauxite residue (TBR) displayed distinct changes in soluble Na, Ca and Al, and a reduction in pH and total alkalinity. SEM images suggest that mineral acid transformations promote macro-aggregate formation, and the positive promotion of citric acid, confirming the removal or reduction in soluble and exchangeable Na. NEXAFS analysis of Na K-edge revealed that the chemical speciation of Na in TBRs was consistent with BR. Three acid treatments and gypsum combination had no effect on Na speciation, which affects the distribution of Na revealed by sodium STXM imaging.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofpagefrom382
dc.relation.ispartofpageto390
dc.relation.ispartofissuePart B
dc.relation.ispartofjournalJournal of Hazardous Materials
dc.relation.ispartofvolume324
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchEngineering
dc.subject.fieldofresearchOther engineering not elsewhere classified
dc.subject.fieldofresearchcode34
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode40
dc.subject.fieldofresearchcode409999
dc.titleAcid transformation of bauxite residue: Conversion of its alkaline characteristics
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorChen, Chengrong


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