Dependence of radon emanation of red mud bauxite processing wastes on heat treatment

V. Jobbágy, J. Somlai, J. Kovács, G. Szeiler, T. Kovács

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Natural radioactivity content, radon emanation and some other physical characteristics of red mud were investigated, so that to identify the possibilities of the safe utilization of such material as a building material additive. Based on the radionuclide concentration, red mud is not permitted to be used directly as a building material, however, mixing of a maximum 20% red mud and 80% clay meets the requirements. The main aim of this work was to determine the dependence of the emanation factor of red mud firing temperature and some other parameters. The relevant experimental procedure was carried out in two different ways: without any additional material, and by adding a known amount of sawdust (5-35 wt%) then firing the sample at a given temperature (100-1000 °C). The average emanation factor of the untreated dry red mud was estimated to 20%, which decreased to about 5% at a certain heat treatment. Even lower values were found using semi-reductive atmosphere. It has been concluded that all emanation measurements results correlate well to the firing temperature, the specific surface and the pore volume.

Original languageEnglish
Pages (from-to)1258-1263
Number of pages6
JournalJournal of Hazardous Materials
Volume172
Issue number2-3
DOIs
Publication statusPublished - Dec 30 2009

Keywords

  • Bauxite processing wastes
  • Building material
  • Radioactivity
  • Radon emanation
  • Red mud

ASJC Scopus subject areas

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

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