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Jarosite inclusion of fluoride and its potential significance to bioleaching of sulphide minerals
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0001-9794-8305
Laboratory of Nuclear Chemistry, Institute of Chemistry, Eötvös Loránd University.
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2009 (English)In: Hydrometallurgy, ISSN 0304-386X, E-ISSN 1879-1158, Vol. 96, no 1-2, p. 108-116Article in journal (Refereed) Published
Abstract [en]

Incorporation of fluoride ions into the structure of jarosite, a common precipitate in bioleaching, was studied. Crystalline jarosite was synthesized in the presence of various concentrations of fluoride ions and characterized by spectroscopic- and chemical analysis.The results showed that substantial amounts of fluoride were sorbed to jarosite, increasing with pH and fluoride concentration. FTIR, XRD and Mössbauer analysis supported a structural incorporation of the fluoride. Due to the size similarity between fluoride and hydroxide ions, a probable mechanism is an exchange of hydroxide ions and fluoride ions within the jarosite, giving the composition KFe3(SO4)2(OH)6 - xFx(s). For the maximum concentration of fluoride used during synthesis, 200 mM, about 25% of the hydroxide ions were exchanged for fluoride ions. The mass of jarosite precipitated shown to be highly dependent on the fluoride concentration, with approximately half the yield using 200 mM potassium fluoride compared to in the absence of fluoride ions.To test the influence on toxicity of the incorporation of fluoride in jarosite, a bioleaching study was performed at 65 °C. A suspension of pyrite concentrate with 4% solid content (w/v) in the modified 9 K medium was bioleached under additions of potassium fluoride. The results indicated a higher tolerance for fluoride ions, as compared to earlier reported studies on fluoride toxicity during bioleaching.

Place, publisher, year, edition, pages
2009. Vol. 96, no 1-2, p. 108-116
National Category
Physical Chemistry Metallurgy and Metallic Materials Physical Chemistry
Research subject
Chemistry of Interfaces; Process Metallurgy; Physical Chemistry
Identifiers
URN: urn:nbn:se:ltu:diva-10018DOI: 10.1016/j.hydromet.2008.08.012ISI: 000262876100017Scopus ID: 2-s2.0-58149203407Local ID: 8c4e1240-bc82-11dd-a7c4-000ea68e967bOAI: oai:DiVA.org:ltu-10018DiVA, id: diva2:982958
Note
Validerad; 2009; 20081127 (lagu)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Gunneriusson, LarsSandström, ÅkeHolmgren, Allan

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