title: De novo formation characteristics of dioxins in the dry zone of an iron ore sintering bed.
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 degrees C, with the maximum observed at around 300 degrees 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.
authors.affiliation: Department of Architectural Environmental Engineering, Kanto Gakuin University, 1-50-1 Mutsuurahigashi, Kanazawa-ku, Yokohama 236-8501, Japan. suzuki.kazuyuki@nies.go.jp
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: E
authors.initials: E
authors.lastname: Kasai
authors.forename: T
authors.initials: T
authors.lastname: Aono
authors.forename: H
authors.initials: H
authors.lastname: Yamazaki
authors.forename: K
authors.initials: K
authors.lastname: Kawamoto
mesh_terms: D017606:Chlorine Compounds / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D004147:Dioxins / Q000138:chemical synthesis*; D004787:Environmental Pollution / Q000517:prevention & control*; D007564:Japan; D008669:Metallurgy; D013696:Temperature
chemical_list: D017606:Chlorine Compounds; D004147:Dioxins; D003300:Copper