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

Zoltán Sas, János Szántó, János Kovács, J. Somlai, T. Kovács

Research output: Contribution to journalArticle

20 Citations (Scopus)

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
DOIs
Publication statusPublished - Oct 1 2015

Fingerprint

Exhalation
Radon
radon
mud
Hot Temperature
Heat treatment
structural change
Temperature
Byproducts
Porosity
scanning electron microscopy
porosity
Health
Scanning electron microscopy
effect

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

Cite this

Influencing effect of heat-treatment on radon emanation and exhalation characteristic of red mud. / Sas, Zoltán; Szántó, János; Kovács, János; Somlai, J.; Kovács, T.

In: Journal of Environmental Radioactivity, Vol. 148, 01.10.2015, p. 27-32.

Research output: Contribution to journalArticle

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