A carregar...
Publicação
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
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.01 MB | Adobe PDF |
Orientador(es)
Resumo(s)
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.
Descrição
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
Contexto Educativo
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