Fiordaliso, Elisabetta Maria

Gkamaletsos, Platon

Godelitsas, A.

Göttlicher, J.

Kasama, Takeshi

Steininger, R.

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 20, 2017Vanadium in Al-Ore (Bauxite) from Mines of Central GreeceGkamaletsos, Platon; Godelitsas, A.; Kasama, Takeshi; Fiordaliso, Elisabetta Maria; Göttlicher, J.;Steininger, R.Publication date:2017Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Gkamaletsos, P., Godelitsas, A., Kasama, T., Fiordaliso, E. M., Göttlicher, J., & Steininger, R. (2017). Vanadiumin Al-Ore (Bauxite) from Mines of Central Greece. Abstract from V.M. Goldschmidt Conference 2017, Paris,France.Goldschmidt2017 Abstract  Vanadium in Al-ore (bauxite) from mines of central Greece P.N. GAMALETSOS1,2*, A. GODELITSAS2, T. KASAMA1, E.M. FIORDALISO1, J. GÖTTLICHER3, R. STEININGER3  1Center for Electron Nanoscopy, Technical University of Denmark, Denmark (*correspondence: plagka@dtu.dk) 2School of Science, N&K University of Athens, Greece 3ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany  Vanadium, either as critical metal extracted as by-product of other metal ores (e.g., [1]) or as potential hazardous element due to its involvement in red mud (RM) accident in Hungary (e.g., [2]), is an element of increased importance in aluminum mining and metallurgical industry. Recently, seawater-leaching experiments indicated significant V release from Greek RM and negligible for its parent Al-ore (bauxite) [3]. Acetic acid-leaching tests with the RM also indicated V release, as in the case of seawater [3]. While there is much debate on V in Hungarian, Greek and Australian RM [2-4], there are no advances concering its partitioning and speciation in the mineral phases of bauxite. Commercial bauxite samples from mines of central Greece have been investigated -in bulk- by PXRD (incl. the clay fraction of 2-0.2µm) and ICP-MS, as well as, at the micro-/nano-scale using electron microscopy (SEM-WDS and TEM/HRTEM, after FIB-SEM -in selected areas previously checked by WDS- and Ar ion milling for microstructure observation) along with Synchrotron radiation (SR μ-XRF and µ-XAFS). The measurements showed that V is mainly intercorrelated to Si, Ca and Mg (not to Al, Ti, Fe) in micro-areas between pisoliths, following the Si/Al ratio. The hosting phase is most likely a kaolinite-type clay (V up to 1400 ppm), and less probably boehmite. It predominantly occurs as V5+ (although minor contribution of V4+ cannot be excluded), indicating the existence of adsorbed V-anions, belonging to the series of metavanadate (VO3-) to decavanadate (V10O286-), rather than V-cations of lower oxidation state (V4+/vanadyl/oxovanadium or even V3+) substituting Al3+ into the octahedral sheet of kaolinite-type structure [5,6]. It is therefore demonstrated  that V is not related to Fe- and Fe-Ti-oxide minerals, despite their abundance in Al-ores, in contrast to its behaviour in other common basic metal ores [6].  [1] Mudd et al., (2016 – in press) Ore Geol. Rev.; [2] Burke et al., (2013) Environ. Sci. Technol., 47, 6527; [3] Gamaletsos et al., (2016) Sci. Rep., 6 (21737), 1; [4] Gräfe et al., (2011) J. Environ. Quality, 40, 767; [5] Gehring et al., (1993) Clays Clay Mineral., 41(6), 662; [6] Huang et al., (2015) Chem. Geol., 417, 68. 

Vanadium in Al-Ore (Bauxite) from Mines of Central Greece

http://orbit.dtu.dk/ws/files/134385961/Untitled.pdf

Vanadium in Al-Ore (Bauxite) from Mines of Central Greece

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology