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  • Acid transformation of bauxite residue: Conversion of its alkaline characteristics

    Author(s)
    Kong, Xiangfeng
    Li, Meng
    Xue, Shengguo
    Hartley, William
    Chen, Chengrong
    Wu, Chuan
    Li, Xiaofei
    Li, Yiwei
    Griffith University Author(s)
    Chen, Chengrong
    Year published
    2017
    Metadata
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    Abstract
    Bauxite 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 ...
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    Bauxite 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.
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    Journal Title
    Journal of Hazardous Materials
    Volume
    324
    Issue
    Part B
    DOI
    https://doi.org/10.1016/j.jhazmat.2016.10.073
    Subject
    Chemical sciences
    Environmental sciences
    Engineering
    Other engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/340767
    Collection
    • Journal articles

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