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On Dioxin Formation...
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Cieplik, Mariusz K
(författare)
On Dioxin Formation in Iron Ore Sintering
- Artikel/kapitelEngelska2003
Förlag, utgivningsår, omfång ...
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2003-06-27
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American Chemical Society (ACS),2003
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:umu-9224
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-9224URI
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https://doi.org/10.1021/es026292gDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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Iron ore sintering is an important source of "dioxins", polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). This paper reports on attempts to identify materials, conditions, and mechanisms responsible for PCDD/F formation (i) by investigating salient properties of ores (viz., with respect to oxidation, condensation, and chlorination of model organics) and (ii) by mimicking the industrial process on a microscale with real-life materials. Principles of Design of Experiments (DOE) are employed. The reactivities of iron ores differ greatly. Limonite/goethite "soft" ore is a very active oxidation catalyst (e.g., for benzene and phenol), a property that may be useful in cleaning up crude sintering process offgases, whereas hematite/magnetite "hard" ore is not. The latter, however strongly promotes condensation of phenol to dibenzofuran. A newly built lab-microscale sintering facility could satisfactorily imitate the large-scale process, in part or as a whole. Results obtained with realistic feed mixtures point at dioxin formation in the sinter bed at levels significant enough to explain a major part of the outputs observed in the real-life process. With ~8 ppm (wt) of chloride added as NaCl, the PCDD/F output doubled, but with the same proportion of chlorine administered as C2Cl4, the dioxin output was over 2 orders of magnitude larger. The use of process reverts, etc. containing chlorinated organics should therefore be avoided. PCDD/F congener patterns are also reported and compared with those observed in practice.
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Carbonell, Jose Pastor
(författare)
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Muñoz, Christina
(författare)
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Baker, Sarah
(författare)
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Krüger, Sophie
(författare)
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Liljelind, PerUmeå universitet,Kemiska institutionen(Swepub:umu)peli0001
(författare)
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Marklund, StellanUmeå universitet,Kemiska institutionen(Swepub:umu)stma0004
(författare)
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Louw, Robert
(författare)
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Umeå universitetKemiska institutionen
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Environmental Science & Technology: American Chemical Society (ACS)37:15, s. 3323-310013-936X1520-5851
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