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Characterization of Double Leached Waelz Oxide for Identification of Fluoirde Mineral
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0001-8800-4695
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0003-3363-351x
Umeå University.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0001-9297-8521
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2019 (English)In: Metals, ISSN 2075-4701, Vol. 9, no 3, article id 361Article in journal (Refereed) Published
Abstract [en]

Double leached Waelz oxide (DLWO), with 76% zinc, is a secondary zinc containing raw materials obtained by the treatment of electric arc furnace dust. The content of fluoride in DLWO is still too high for direct leaching, as fluoride has a detrimental effect on electrowinning for zinc production. Knowledge of the characteristics of DLWO, and especially on how a fluoride mineral might exist, can contribute to further improvement of the selective leaching for the removal of fluoride. In this study, DLWO was characterized using analytical techniques, such as inductively coupled plasma-optical emission spectroscopy (ICP-OES), 19F liquid-state nuclear magnetic resonance (19F LS NMR), X-ray powder diffraction analysis (XRD), scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) and 19F solid-state nuclear magnetic resonance (19F SS NMR). This study showed that DLWO mainly consisted of zincite (ZnO), cerussite (PbCO3) and a spinel containing zinc, iron and manganese. The fluoride mineral identified was calcium fluoride (CaF2). In SEM analysis, fluorine was found in larger grains together with calcium and oxygen, which was possibly calcium carbonate.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 3, article id 361
Keywords [en]
metal recycling; zinc secondary dust material; characterization of double leached Waelz oxide; halogens; fluoride identification
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-73646DOI: 10.3390/met9030361ISI: 000464321200002Scopus ID: 2-s2.0-85064228809OAI: oai:DiVA.org:ltu-73646DiVA, id: diva2:1304964
Note

Validerad;2019;Nivå 2;2019-04-16 (oliekm)

Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-05-03Bibliographically approved

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Publisher's full textScopushttps://www.mdpi.com/2075-4701/9/3/361

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Sar, SuchandraSundqvist Ökvist, LenaEngström, FredrikSamuelsson, Caisa

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