Adsorption behaviour of xanthate and dithiophosphinate from their mixtures on chalcopyrite

Bağcı, E.; Ekmekçi, Zafir; Bradshaw, Dee

doi:10.1016/j.mineng.2007.04.011

Cited by 34 publications

(33 citation statements)

References 9 publications

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“…Compared with the highly toxic inorganic modifiers, polysaccharides have significant advantages due to their nontoxic and selective inhibition properties [7][8][9]. It has been shown that the adsorption difference of Dextrin-WY on sulfide minerals and on the talc surface resulted in different densities of hydroxyl groups that were exposed to solution [4].…”

Section: Introductionmentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

Minerals

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Abstract:The flotation and adsorption of a new polysaccharide konjac gum (KG) on pyrite and talc in the presence of pre-adsorbed potassium butyl xanthate (PBX) is investigated. The micro-flotation results show that KG is a quality depressant for talc and that conditioning the minerals initially with PBX before KG will increase the recovery difference between pyrite and talc. The results of artificially mixing the minerals show that compared with adding KG before PBX, when minerals are pre-adsorbed with PBX, the grade and the recovery of sulfur (S) increases by 1.96% and 5.44%, respectively. The contact angle results show that the addition of PBX before KG will increase the contact angles of pyrite, but the addition order of KG/PBX has little influence on the contact angles of talc. The adsorption tests show that KG can adsorb on pyrite and talc surfaces, while PBX can only adsorb on the pyrite surface. The addition order of KG/PBX affects the adsorption of KG and PBX on the pyrite surface but not on the talc surface. Fourier transform infrared (FTIR) spectra analysis further demonstrates the chemical adsorption of KG on pyrite and talc surfaces, while PBX chemisorbs on the pyrite surface. Based on these analyses, a schematic illustration of the reagent adsorption forms on pyrite and talc surfaces is drawn to explain the competitive adsorption of KG and PBX on mineral surfaces.

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Section: Introductionmentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

Minerals

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“…Bagci et al (2007) attribute a similar peak observed in a chalcopyrite and sodium isopropyl xanthate system to the adsorption of xanthate as CuX. Comparing the voltammograms of different xanthate concentrations in Figure 3 it can be seen that the current density of peak 1 diminishes with increasing `concentration and a peak at low positive potential is present at a concentration of 10 -3 M, suggestive of dixanthogen formation.…”

Section: Cyclic Voltammetrysupporting

confidence: 52%

“…Peak 3 is also shifted to a higher potential as a consequence of surface passivation by a hydrophobic dixanthogen layer, which prevents oxidation of the surface at lower anodic potentials. Although the interaction of DTPI collectors with sulphide minerals has been well studied in the literature (Bagci et al, 2007;Güler et al, 2006;Pecina et al, 2006), these works have focussed on the more common base metal and iron sulphides such as chalcopyrite, pyrite and galena. Limited information is available about the interaction of DTPIs with arsenic-bearing sulphides, of which enargite and tennantite (Cu12As4S13) are the most significant in copper ore bodies (Petrus et al, 2011a).…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Investigation of the surface species formed on enargite in electrochemically controlled oxidising environments and in the presence of flotation collectors

Plackowski¹

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Arsenic sulphides such as enargite and tennantite can represent significant penalty elements in base metals production. There are significant economic advantages to achieving a separation of arsenic bearing minerals at an early stage in processing, but to date no feasible widely applicable commercial method of flotation separation has been developed. A review of the existing literature on the selective flotation of enargite considered its surface properties and floatability. Special consideration was given to the various approaches in the study of enargite surface chemistry, and the implications for the flotation of enargite. Developments in these approaches were critically reviewed and discussed.The surface oxidation and hydrophobicity of natural enargite (Cu3AsS4) and the formation of oxidation species at the mineral surface were examined by a novel experimental approach that combines electrochemical techniques and atomic force microscopy (AFM). Combined with ex situ cryo X-ray photoelectron spectroscopy (XPS), the surface speciation of oxidised enargite was obtained, and compared with the newly fractured natural enargite surface.At pH 4, surface layer formations consisting of metal-deficient sulphide and elemental sulphur were identified, associated with a limited increase in root-mean-square (rms) roughness (1.228 to 3.143 nm) and an apparent heterogeneous distribution of surface products as demonstrated by AFM imaging. A mechanism of initial rapid dissolution of Cu followed by diffusion-limited surface layer deposition was identified.At pH 10, a similar mechanism was identified although the differences between the initial and diffusion-limited phases were less definitive. Surface species were identified as copper sulphate and hydroxide. A significant increase in surface rms roughness was found (0.795 to 9.723 nm). Dynamic (receding) contact angle measurements obtained by a droplet evaporation method found no significant difference between the oxidised surface and a freshly polished surface. A significant difference was found between the polished surface and that oxidized at pH 4, with an increase in contact angle of about 13° (46° to 59°) after oxidation. Competing effects of hydrophilic and hydrophobic species on the mineral surface under oxidizing conditions at pH 4 and the change in surface roughness at pH 10 may contribute to the observed effects of electrochemically controlled oxidation on enargite hydrophobicity.The effects of X-ray radiation on the surface after electrochemical oxidation were investigated using XPS. Surface species present on unoxidized enargite were compared with those present after oxidation at pH 10, and the effects of X-ray irradiation time as a ii function of temperature were studied. XPS spectra characteristic of a copper (II) hydroxide surface layer reduced in intensity with increasing X-ray exposure time. Associated changes in the relative concentrations of surface oxygen species were also observed.Temperature was shown to significantly influence the rate of change. A...

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“…It was also proposed that the dithiocarbamate acted as an anchor for the secondary adsorption of the dixanthogen molecules (Bradshaw et al, 1998). The theory of strong and weak sites, similar to that put forward by Plaskin and Zaitseva (1960), was proposed for a xanthate-dithiophosphinate mixture (Bagci et al, 2007), the stronger collector occupying the weaker, more oxidised sites and the weaker collector occupying the stronger, less oxidised sites. This would result in a more dense and a more even surface coverage.…”

Section: Introductionmentioning

confidence: 66%

“…Other proposals have been made regarding the mechanisms involved when mixtures of collectors are used. These include a change in observed froth behaviour (Hangone et al, 2005;Wiese et al, 2005), increased collector adsorption (Bagci et al, 2007) and particle hydrophobicity (Bradshaw, 1997;Valdiviezo and Oliveira, 1993).…”

Section: Introductionmentioning

confidence: 99%

The effect of mixed thiol collectors on the flotation of galena

McFadzean

Castelyn

O’Connor

2012

Minerals Engineering

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Adsorption behaviour of xanthate and dithiophosphinate from their mixtures on chalcopyrite

Cited by 34 publications

References 9 publications

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Investigation of the surface species formed on enargite in electrochemically controlled oxidising environments and in the presence of flotation collectors

The effect of mixed thiol collectors on the flotation of galena

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