Towards the recovery of by-product metals from mine wastes : an X-Ray absorption spectroscopy study on the binding state of rhenium in debris from a centennial Iberian Pyrite Belt mine
| Autor: | João Pedro Veiga, Maria João Batista, Teresa Pereira Silva, M.O. Figueiredo, Daniel de Oliveira |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Engineering
Faixa Piritosa Ibérica Geochemistry chemistry.chemical_element Mineralogy 02 engineering and technology 010502 geochemistry & geophysics Espectroscopia 01 natural sciences Resíduos mineiros Absorção de raios X 0105 earth and related environmental sciences Minas abandonadas X-ray absorption spectroscopy Iberian Pyrite Belt Mineral business.industry Recuperação ambiental Rénio Rhenium 021001 nanoscience & nanotechnology Sulfur XANES Gestão de resíduos chemistry Molybdenite Mina de S. Domingos (concelho de Mértola Portugal) 0210 nano-technology business Earth (classical element) |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Rhenium is a very scarce element, occurring in the Earth's crust mainly carried by molybdenite (MoS2). Due to a very low availability comparative to actual industrial demand, rhenium is nowadays one of the most expensive mineral commodities and an increased interest is focused on exploring residues resulting from a long-term mining, particularly of sulphide ore deposits. It is therefore noteworthy to assign the presence of rhenium (in a concentration up to 3 ppm) in the waste materials from the old sulphur factory at the abandoned mine of São Domingos (Iberian Pyrite Belt, Southeast Portugal), exploited since the Roman occupation of Iberia. Aiming at a potential sustainable recovery of rhenium as a by-product, X-ray near-edge absorption spectroscopy (XANES) was applied to clarify the Re-binding and mode of occurrence by comparing Re L3-edge XANES spectra obtained from mine waste samples (previously fully characterized by X-ray laboratory techniques) with similar spectra collected from Re-rich molybdenites (Mo1-xRexS2) and from Re-O model compounds configuring various valences and coordination environments of rhenium ions. Obtained results are commented, ruling out a possible Re-S binding and rather conforming with the binding of rhenium to oxygen in the analysed mine waste materials. |
| Databáze: | OpenAIRE |
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