Surface characterization of chalcopyrite interacting with Leptospirillum ferriphilum

Gu, Guohua; Hu, Ke-ting; Li, Shuang-ke

doi:10.1016/s1003-6326(14)63269-6

Cited by 18 publications

(8 citation statements)

References 12 publications

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“…Negative zeta potentials displayed by the microbial suspensions are due to the presence of negatively charged functional groups, such as carboxyl (-COOH), amino (-NH 2 ) and hydroxyl (-OH), which form part of lipopolysaccharides, lipoproteins and surface proteins of microbial cell walls [40]. This result agreed with the low isoelectronic points recorded for various microbes investigated in previous studies [19,[39][40][41][42]. Most microbes exhibited isoelectronic points around pH 3 or lower.…”

Section: Zeta Potential Measurements On Sulphide Minerals In the Presence And Absence Of Microbessupporting

confidence: 88%

Investigating the Electrochemical Interaction of a Thiol Collector with Chalcopyrite and Galena in the Presence of a Mixed Microbial Community

et al. 2020

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High microbial cell counts have been recorded in sewage waters employed as process water in mineral beneficiation plants across the world. The presence of these microbes can negatively impact flotation performance through mineral passivation, although some microbes improve flotation performance as investigated in various bio-flotation studies. The current study aims to understand the electrochemical behaviour of minerals in the presence of a sodium ethyl xanthate (SEX) collector and microbes originating from a sulphide ore processing plant in South Africa. The electrochemical response was correlated to observe flotation performance. Mixed potential measurements were conducted in parallel to microflotation tests, to assess the hydrophilicity or hydrophobicity induced on sulphide minerals adapted to microbe-laden synthetic plant water. Sulphide minerals’ mixed potentials and interactions of SEX with sulphide minerals were dramatically reduced in the presence of the mixed microbial community (MMC). The observations were correlated with poor flotation efficacy noted in microflotation tests. These fundamental results shed light on how the adsorption of thiol collectors on sulphide minerals is adversely affected by microbes, prompting a discussion on flotation process monitoring when mineral beneficiation is conducted using microbe-laden water.

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Section: Zeta Potential Measurements On Sulphide Minerals In the Presence And Absence Of Microbessupporting

confidence: 88%

Investigating the Electrochemical Interaction of a Thiol Collector with Chalcopyrite and Galena in the Presence of a Mixed Microbial Community

et al. 2020

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“…Treatment Value (°) Methods Pyke et al [16] Bare surface 40 N/A Sharma and Rao [17] Bare surface 70 Sessile drop Chen et al [20] Bare surface 72 Sessile drop Himawan et al [18] Bare surface 72 Sessile drop Gu et al [21] Bare surface 78 Sessile drop Rao and Patel [22] Dixanthogen 55-100 Captive bubble The microflotation results of chalcopyrite in water (PAX 0 M) matched well with the contact angle results above. Even without any addition of PAX as collectors, the microflotation recovery of pure chalcopyrite can be as high as 80%.…”

Section: Authormentioning

confidence: 58%

A Study of Temperature Effect on the Xanthate’s Performance during Chalcopyrite Flotation

Zhang

2020

Minerals

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A multi-scale investigation was conducted to study the surface properties of xanthate-absorbed chalcopyrite at elevated temperature to understand the temperature effect on the xanthate’s performance during chalcopyrite flotation. Firstly, a macro-scale study was initiated to investigate the temperature effect on the hydrophobicity of mineral surface by means of contact angle measurement, Hallimond tube microflotation and lab flotation tests; secondly, a micro–scale study was conducted to clarify the temperature effect on the adsorption of chemicals on mineral surface employing an atomic force microscope (AFM) and Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR). In the experiments, pure chalcopyrite samples were used for contact angle measurement, Hallimond tube microflotation, AFM and FTIR; and copper ore samples (1.51% Cu, 5.88% Fe 0.029% Mo, 5.23% S in weight percentage) were used for lab flotation tests. FTIR spectra and AFM images showed that, when potassium amyl xanthate (PAX) was used as the collector in this study, oily dixanthogen was the main hydrophobic species on the chalcopyrite surface. The morphological change of dixanthogen patches at elevated temperatures has a more significant impact than changes in the amount of adsorption species. Increasing temperature within a certain range is beneficial for the collector’s performance by increasing flotation recovery.

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“…7(i), appeared as dried powdered material. During the drying process the cell structure of the bacteria degraded as dehydration occurred resulting in the loss of the integrity of the original cell morphology (Gu et al, 2014). EDS analysis determined that the major surface elements present were carbon and oxygen prior to Eu(III) biosorption.…”

Section: Sem/eds Analysismentioning

confidence: 99%

Facile synthesis of chitosan derivatives and Arthrobacter sp. biomass for the removal of europium(III) ions from aqueous solution through biosorption

Cadogan

Lee

Popuri

2015

International Biodeterioration & Biodegradation

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Surface characterization of chalcopyrite interacting with Leptospirillum ferriphilum

Cited by 18 publications

References 12 publications

Investigating the Electrochemical Interaction of a Thiol Collector with Chalcopyrite and Galena in the Presence of a Mixed Microbial Community

Investigating the Electrochemical Interaction of a Thiol Collector with Chalcopyrite and Galena in the Presence of a Mixed Microbial Community

A Study of Temperature Effect on the Xanthate’s Performance during Chalcopyrite Flotation

Facile synthesis of chitosan derivatives and Arthrobacter sp. biomass for the removal of europium(III) ions from aqueous solution through biosorption

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