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

作     者：Maria-Ondina Figueiredo Teresa Pereira da Silva Joao Pedro Veiga Daniel de Oliveira Maria Joao Batista 

作者机构：CENIMAT/I3NFaculty of Sciences and TechnologyNew University of LisbonCampus da CaparicaLisbonPortugal Unit of Mineral Resources and GeophysicsNational Laboratory for Energy and GeologyAmadoraPortugal 

出 版 物：《Journal of Minerals and Materials Characterization and Engineering》 (矿物质和材料特性和工程（英文）)

年 卷 期：2014年第2卷第2期

页      面：135-143页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

基　　金：the project MinReMol(Ref.EXPL/AAG-REC/0978/2012),financed by FEDER Funds through the Operational Program on Competitive Factors(COMPETE:FCOMP-01-0124-FEDER-027516) by national funds through the Portuguese Foundation for Science and Technology(FCT-MCTES) support of FCT-MCTES through the Strategic Project LA25-2011-2012(ref.PEst-C/CTM/LA0025/2011) 

主　　题：Mine Waste Materials By-Products Iberian Pyrite Belt Rhenium XANES Re L_(3)-Edge 

摘      要：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 ex- ploring 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 Sao 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.