Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2584
Título: 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: Figueiredo, M. Ondina
Silva, Teresa Pereira
Veiga, João Pedro
Oliveira, Daniel P. S.
Batista, Maria João
Palavras-chave: Minas abandonadas
Resíduos mineiros
Gestão de resíduos
Recuperação ambiental
Rénio
XANES
Absorção de raios X
Espectroscopia
Mina de S. Domingos (concelho de Mértola, Portugal)
Faixa Piritosa Ibérica
Data: 2014
Citação: Figueiredo, Maria O... [et al.] - 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. In: Journal of Minerals and Materials Characterization and Engineering, 2, 2014, p. 135-143
Resumo: 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.
URI: http://hdl.handle.net/10400.9/2584
DOI: http://dx.doi.org/10.4236/jmmce.2014.22018
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