Fundamental electrochemical and Raman spectroscopic investigations of the flotation behaviour of PtAs2

Vermaak, M.K.G.; Pistorius, Petrus Christiaan; Venter, J.A.

doi:10.1016/j.mineng.2007.04.004

Cited by 12 publications

(10 citation statements)

References 6 publications

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“…However, after the pioneer work of Mernagh & Hoatson (1995), few data have been published on the application of Raman technique to recognize the natural PGM (Zaccarini et al, 2009(Zaccarini et al, , 2010McDonald et al, 2010;Grammatikopoulos et al, 2011;Vymazalová et al, 2012) as well as to investigate synthetic PGM (e.g. Weber et al, 1988;Graham et al, 1991;Merkle et al, 1997;Pikl et al, 1999;Vermaak et al, 2007). Therefore, the Raman spectra available on PGM are still scarce.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy characterisation of synthetic platinum-group minerals (PGM) in the Pd–Sn–Te and Pd–Pb–Te ternary systems

Vymazalová

Zaccarini

Bakker

2014

ejm

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The identification of minerals that occur as tiny and rare phases such as most of the natural platinum-group minerals (PGM) is a challenging target. The main reason for that resides in their size (generally less than 10 micrometres) and mode of occurrence (i.e. polyphasic aggregates) that make problematic the identification by standard X-ray diffraction methods. In this contribution we have applied the Raman spectroscopy to synthetic PGM in the ternary systems Pd-Sn-Te and Pd-Pb-Te. Some of the analyzed PGM show characteristic Raman bands and the following PGM can be distinguished using the Raman spectroscopy: merenskyite, kotulskite, kojonenite, pašavaite and Pd 3 Te 2. Other PGM in the ternary Pd-Sn-Te and Pd-Pb-Te systems cannot be identified using this technique. These results demonstrate that Raman spectroscopy can be considered as an innovative and complementary methodology with a potential to identify and to better characterize the PGM.

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Section: Introductionmentioning

confidence: 99%

Raman spectroscopy characterisation of synthetic platinum-group minerals (PGM) in the Pd–Sn–Te and Pd–Pb–Te ternary systems

Vymazalová

Zaccarini

Bakker

2014

ejm

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“…Several studies have investigated the poor flotation properties of sperrylite and cite particle size and size distribution, along with potential interactions with other sulfurcontaining species which may interact with the sperrylite grains and so depress its flotation properties. 6 In addition it is worth remembering that the modelling work documented here was performed on pristine, idealised surface models of minerals and metal surfaces. In reality, complex oxidation behaviour is likely to occur, which can reasonably be expected to be condition-dependent and give rise to significant alterations to the surface chemistry.…”

Section: Discussionmentioning

confidence: 99%

“…A clear progression can be observed for the oxidation potentials of EX on the three working electrode surfaces, and the peak maxima show good agreement with mixed oxidation potentials quoted by others (Sp (ca. +0.26 V vs SHE, 6 Pn ca. +0.24 V vs SHE, 49 along with Pt ca.…”

Section: Ex On Sp Pn and Ptmentioning

confidence: 99%

“…The appearance of dixanthogen at higher oxidation potentials through the appearance of the S-S stretching mode was also reported. [6][7][8][9][10][11][12][13] The surface enhancement effect for dixanthogen bound to a gold surface was very weak, however, which led Woods et al 9 to propose that dixanthogen species were more likely to form physisorbed multilayers above the chemisorbed monomer.…”

Section: Introductionmentioning

confidence: 99%

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A Computational and Experimental Study on the Binding of Dithio Ligands to Sperrylite, Pentlandite, and Platinum

et al. 2016

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This benchmark study documents a combined computational and experimental investigation into the binding of three commercial dithio collector ligands used in industrial froth flotation processes to separate high value minerals from lower value material. First principles condensed matter simulations showed that ethyl xanthate, N,N-diethyl dithiocarbamate and diisobutyl dithiophospinate anions all bind least strongly to the [100] Miller index plane of the platinum-containing mineral sperrylite, followed by the [111] MI surface of the mixed nickel/iron sulphide mineral pentlandite, while all ligands showed strongest binding affinity to the [111] MI surface model of pure platinum. Calculations also support experimental observations that neutral ethyl xanthogen disulphide formed on oxidation of ethyl xanthate binds much more weakly than the monomer. A monolayer of water molecules would easily be displaced from all surfaces by any of the collector ligands. The hydroxide anion was found to have binding energies of comparable magnitude to the collector ligands on all surfaces. Cyclic voltammetry measurements performed on working electrodes constructed from sperrylite, pentlandite and platinum permitted measurement of the mixed oxidation potential associated with the surface dimerization reaction for all three collector ligands, although the data obtained for diisobutyl dithiophospinate was less clear cut than for the other ligands. Comparison of the relative ordering of the mixed potentials for the three ligands gave a favourable match with the predicted outcome of binding energy strengths obtained from the modelling study. This study demonstrates that first principles simulations can be used to predict the binding energies of collector ligands to mineral and metallic surfaces.

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“…Исследования в области флотации МПГ сфокусированы в основном на флотации сульфидов, с которыми они ассоциированы, и в большинстве случаев проводятся на руде, что обусловлено трудностями выделения МПГ из руды из-за низкого содержания и тонкой вкрапленности. Взаимодействие МПГ с собирателями изучалось преимущественно на синтезированных минералах платины и палладия [3,[4][5][6], а также на сульфидах с искусственно нанесенной платиной [7,8].…”

Section: Introductionunclassified

The influence of collectors containing diisobutyldithiophosphinate on the flotation of sulfides and platinum-group metals of copper-nickel ores

Лавриненко

Макаров

Sarkisova

et al. 2019

Izv.VUZ. Tsvet. Met.

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Fundamental electrochemical and Raman spectroscopic investigations of the flotation behaviour of PtAs2

Cited by 12 publications

References 6 publications

Raman spectroscopy characterisation of synthetic platinum-group minerals (PGM) in the Pd–Sn–Te and Pd–Pb–Te ternary systems

Raman spectroscopy characterisation of synthetic platinum-group minerals (PGM) in the Pd–Sn–Te and Pd–Pb–Te ternary systems

A Computational and Experimental Study on the Binding of Dithio Ligands to Sperrylite, Pentlandite, and Platinum

The influence of collectors containing diisobutyldithiophosphinate on the flotation of sulfides and platinum-group metals of copper-nickel ores

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