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Study of the presence of fluorine in the recycled fractions during carbothermal treatment of EAF dust
Centro Nacional de Investigaciones Metalúrgicas Avda.
Centro Nacional de Investigaciones Metalúrgicas Avda.
Centro Nacional de Investigaciones Metalúrgicas Avda.
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2003 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 23, no 6, p. 483-491Article in journal (Refereed) Published
Abstract [en]

Carbothermal treatment tests of electric arc furnace dusts (EAFD) using the Waelz kiln process were carried out in pilot-scale for the production of zinc oxide. The association of halides in the EAFD, and the recycled products, such as zinc oxide fumes and high-grade iron contents fractions were examined by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis. XRD reveals the presence of chlorine and fluorine in the dusts in the form of KCl, NaCl and CaF2. An ultra-pure fraction of zinc was obtained after the Double Leaching Waelz Oxide (DLWO) process was performed on the zinc oxide fumes. The halide contents were reduced to approximately 100 ppm Cl and 700 ppm F. The rest of these elements are in the form of CaF2. About 65% F is volatilised as lead and zinc fluorides, 15% is expected in the magnetic fractions and 20% in non-magnetic fractions as CaF2 and MnF2, respectively.

Place, publisher, year, edition, pages
2003. Vol. 23, no 6, p. 483-491
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-2926DOI: 10.1016/S0956-053X(02)00151-4ISI: 000184963400003Scopus ID: 2-s2.0-0042090463Local ID: 0a9b0fb0-a1ad-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-2926DiVA, id: diva2:975780
Note
Validerad; 2003; 20070111 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Menad, Nourreddine

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