De novo formation characteristics of dioxins in the dry zone of an iron ore sintering bed

K. Suzuki, E. Kasai, T. Aono, H. Yamazaki, K. Kawamoto

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

The objectives of this work are to understand the details of the mechanism of dioxin formation in the part of a sintering bed termed the dry zone, and to obtain ideas on how to prevent their formation. Sinter mixtures of various composition types were heated in a packed bed reactor, and dioxins in the outlet gas and in the sinter mixture residue were measured. The dioxin formation potential of a simple sinter mixture composed of iron ore, coke and limestone was markedly lower than that of fly ash from a municipal solid waste incinerator (MSWI). In consideration of this result, a series of experiments were conducted using a sinter mixture impregnated with CuCl2. Experimental results showed that dioxin formation was temperature-dependent in the range of 300-550 °C, with the maximum observed at around 300 °C, which was quite similar to that of fly ash from the MSWI. The homologue distribution of PCDD/Fs in gas and solid reflected the possible difference in carbonaceous materials in coke and activated coke. Gaseous hydrogen chloride acted as a chlorinating reagent for dioxin formation.

Original languageEnglish
Pages (from-to)97-104
Number of pages8
JournalChemosphere
Volume54
Issue number1
DOIs
Publication statusPublished - Jan 2004
Externally publishedYes

Keywords

  • Copper chloride
  • Dioxin formation
  • Dry zone
  • Sinter mixture
  • Sintering bed

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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