Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud

Zoltán Sas, János Szántó, János Kovács, János Somlai, Tibor Kovács*

*Corresponding author for this work

    Research output: Contribution to journalArticle

    21 Citations (Scopus)
    288 Downloads (Pure)

    Abstract

    The reuse of industrial by-products is important for members of numerous industrial sectors. However, though the benefits of reuse are evident from an economical point of view, some compounds in these materials can have a negative effect on users' health.In this study, the radon emanation and exhalation features of red mud were surveyed using heat-treatment (100-1200 °C). As a result of the 1200°C-treated samples, massic radon exhalation capacity reduced from 75 ± 10 mBq kg-1 h-1 to 7 ± 4 mBq kg-1 h-1, approximately 10% of the initial exhalation rate.To find an explanation for internal structural changes, the porosity features of the heat-treated samples were also investigated. It was found that the cumulative pore volume reduced significantly in less than 100 nm, which can explain the reduced massic exhalation capacity in the high temperature treated range mentioned above.SEM snapshots were taken of the surfaces of the samples as visual evidence for superficial morphological changes. It was found that the surface of the high temperature treated samples had changed, proving the decrement of open pores on the surface.

    Original languageEnglish
    Pages (from-to)27-32
    Number of pages6
    JournalJournal of Environmental Radioactivity
    Volume148
    Early online date19 Jun 2015
    DOIs
    Publication statusPublished - Oct 2015

    Keywords

    • Additional material
    • Building material industry
    • By-product
    • Heat-treatment
    • Radon exhalation
    • Red mud

    ASJC Scopus subject areas

    • Environmental Chemistry
    • Health, Toxicology and Mutagenesis
    • Waste Management and Disposal
    • Pollution

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