Molybdenite as a Rhenium Carrier: First Results of a Spectroscopic Approach Using Synchrotron Radiation

Pereira, da Silva Teresa; Maria-Ondina, Figueiredo; Oliveira, Daniel P. S. de; Pedro, Veiga Jo~ao; Jo~ao, Batista Maria

doi:10.4236/jmmce.2013.15032

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…110 The substitution of Re 4þ ions on the Mo 4þ sites in the natural mineral molybdenite caused distortion of the structure. 111 41 Raghavan stated in his book that ''the present status of understanding of the ternary phases of this system is clearly not satisfactory and there is need for further study.'' 113 The available experimental literature disagrees as to which binary or ternary intermetallic phases form upon the interaction between thin Fe films and MoS 2 at high temperatures.…”

Section: Group 7: Mn Tc and Rementioning

confidence: 99%

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Domask

Gurunathan

Mohney

2015

Journal of Elec Materi

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Molybdenum disulfide is a layered transition-metal dichalcogenide semiconductor that is attracting renewed attention for its potential use in future nanoscale electronics, optoelectronics, catalysis, tribology, and other fields. In all of these cases, the interaction between MoS 2 and various transition metals is very important. In this work we survey the thermodynamics of the metal-Mo-S systems and the anticipated reaction products from transition metals and MoS 2 . We examined over 200 references on the reactions between transitions metals (M) and MoS 2 , compiled thermodynamic data, and used the thermodynamic data to predict M-Mo-S ternary phase diagrams for systems without experimentally determined diagrams. Where possible, experimental literature on the interactions between metals and MoS 2 was used to corroborate our predicted diagrams and stable reaction products. Both the previously reported and newly predicted M-Mo-S phase diagrams fall into three categories. In the first category, the metal is in thermodynamic equilibrium with MoS 2 . In another, there is a driving force for the metal to reduce MoS 2 , with tie lines to sulfides of the contact metal dominating the phase diagram. In a final category, there is a very stable solid solution or ternary phase that dominates the phase diagram. Better understanding of the phase equilibria in the M-Mo-S systems will aid research on the use of MoS 2 in a variety of fields.

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Section: Group 7: Mn Tc and Rementioning

confidence: 99%

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Domask

Gurunathan

Mohney

2015

Journal of Elec Materi

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“…In contrast, a study of 2 H polytypes in rhenium-containing molybdenite samples using X-ray absorption spectroscopy (XANES) showed homogeneous distribution of rhenium within the molybdenite structure (Silva et al , 2013).…”

Section: Discussionmentioning

confidence: 98%

Scroll-like and platy molybdenite-3R from the Ufaley metamorphic block, South Urals: EBSD, XRD, SEM, EPMA and ICP-MS study

Belogub

Shilovskikh

Rassomakhin

et al. 2022

MinMag

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Scroll-like crystals of molybdenite, 2–5 mm in size, were found in phengite rock from the outer contact of the granular quartz vein of the Kyshtym quartz deposit. Platy and partly scrolled molybdenite occur in the same phengite rock from the outer contact of the quartz–feldspar pegmatite of the Slyudyanogorsk mica deposit. Both occurrences are located in the Ufaley metamorphic block in the South Urals. Scroll-like molybdenite crystals can associate with platy and partly twisted crystals in the same samples. The chemical composition of molybdenite was studied by inductively coupled plasma mass spectrometry (ICP-MS) and electron probe microanalysis (EPMA). Polytypes of molybdenite were identified with electron back-scattered diffraction (EBSD) and X-ray diffraction (XRD). Both scroll-like and platy molybdenite crystals are only represented by the 3R polytype, are enriched in Re up to 1 wt.% and contain no other significant impurities. Scroll-like molybdenite is twisted mainly around the crystallographic axis X. Twinning with a rotation of 60 degrees around the Z crystallographic axis is fixed in the plane (ab). The most probable origin of scroll molybdenites is the consequent growth of molybdenite around nucleation centres, which are commonly represented by mica crystals. The formation of the 3R polytype is caused by the difference in dimension of the layers enriched and depleted in rhenium.

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“…Present spectroscopic data emphasize the sensitivity of the "white line" energy in Re L 3 -edge XANES spectra to the formal valence and to the binding of the absorbing element: the spectrum collected from Aldfield molybdenite reproduced in Figure 5-Mo 1−x Re x S 2 [27]-reflects the lower valence of rhenium ions (4+) and their binding to sulphur through a lower energy of the "white line" (10,540 eV); comparatively, the higher valences assumed by rhenium ions in the model oxide compounds-6+ in ReO 3 and 7+ in Re 2 O 7 -bring about slightly higher energies, respectively 10,544 eV and 10542.5 eV (Figure 4).…”

Section: Discussionmentioning

confidence: 99%

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

Figueiredo¹,

Silva

Veiga³

et al. 2014

JMMCE

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Rhenium is a very scarce element, occurring in the Earth's crust mainly carried by molybdenite (MoS 2 ). 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 L 3 -edge XANES spectra obtained from mine waste samples (previously fully characterized by X-ray laboratory techniques) with similar spectra collected from Re-rich molybdenites (Mo 1−x Re x S 2 ) 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.

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Molybdenite as a Rhenium Carrier: First Results of a Spectroscopic Approach Using Synchrotron Radiation

Cited by 8 publications

References 21 publications

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Transition Metal–MoS2 Reactions: Review and Thermodynamic Predictions

Scroll-like and platy molybdenite-3R from the Ufaley metamorphic block, South Urals: EBSD, XRD, SEM, EPMA and ICP-MS study

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

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