Adsorption of biosolids and their main components on chalcopyrite, molybdenite and pyrite: Zeta potential and FTIR spectroscopy studies

Reyes-Bozo, Lorenzo; Escudey, Mauricio; Vyhmeister, Eduardo; Higueras, Pablo; Godoy-Faúndez, Alex; Salazar, José Luis; Valdés-González, Héctor; Wolf-Sepúlveda, Germán; Herrera-Urbina, R.

doi:10.1016/j.mineng.2015.04.021

Cited by 81 publications

(25 citation statements)

References 24 publications

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“…Actually, Figure 9 exhibits the apparent zeta potential of pyrite particles as a function of pH in the absence and presence of 4 g/L AAPP. The zeta potential curve shows that the isoelectric point (IEP) of pyrite was around 3.0, which is close to the reported value [64]. It is clear that the presence of AAPP elevated the negativity of the surface charges of pyrite particles, demonstrating the adsorption of electronegative radical ions of AAPP on pyrite surfaces.…”

Section: Role Of Aapp Additivesupporting

confidence: 83%

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

Liu

Min

et al. 2017

Metals

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Abstract:The effect of pyrite and the role of ammonium alcohol polyvinyl phosphate (AAPP) during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils. The results showed that pyrite catalyzed the decomposition and also significantly increased the consumption of thiosulfate. This detrimental effect became more severe with increasing pyrite content. Further, the presence of pyrite also substantially slowed the gold leaching kinetics and reduced the overall gold dissolution. The reduction in gold dissolution was found to be caused primarily by the surface passivation of the gold. The negative effects of pyrite, however, can be alleviated by the addition of AAPP. Comparison of zeta potentials of pyrite with and without AAPP suggests that AAPP had adsorbed on the surface of the pyrite and weakened the catalytic effect of pyrite on the thiosulfate decomposition by blocking the contact between the pyrite and thiosulfate anions. AAPP also competed with thiosulfate anions to complex with the cupric ion at the axial coordinate sites, and thus abated the oxidation of thiosulfate by cupric ions. Moreover, the indiscriminate adsorption of AAPP on the surfaces of gold and passivation species prevented the passivation of the gold surface by surface charge and electrostatic repulsion. Therefore, AAPP effectively stabilized the thiosulfate in the solution and facilitated the gold leaching in the presence of pyrite.

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Section: Role Of Aapp Additivesupporting

confidence: 83%

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

Liu

Min

et al. 2017

Metals

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“…However, it has been postulated that chemical interactions between the hydroxyl groups of polysaccharide (e.g., guar gum) with the metal hydroxyl groups at the mineral surface (e.g., chalcopyrite) may also occur in addition to hydrogen bonding [58,59]. A similar observation has been made for the interaction of biosolids with chalcopyrite, molybdenite and pyrite, although a weaker interaction such as hydrogen bonding or van der Waals force was proposed for the interaction of humic acid with these sulphide minerals [27,60]. The higher adsorption of HA than TA on the minerals surface may also be attributed to the presence of carboxyl groups on HA which are absent on TA and may chemically interact with mineral sites.…”

Section: Discussionmentioning

confidence: 63%

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

2016

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Abstract:One of the water constituents that has not been investigated in great detail for potential detrimental effect on mineral flotation is organic matter. This study investigates the effect of natural organic materials contained in water, such as humic, fulvic and tannic acids, on the flotation of copper and molybdenum sulphides in alkaline conditions and in concentrations similar to those found in natural waters. Results show that copper and molybdenum grades decreased with the addition of humic, tannic and fulvic acid in that order, with a larger depression of molybdenite grade and recovery. Adsorption studies using ultraviolet (UV)-visible spectroscopy and X-ray photoelectron spectrometer (XPS) surface analysis confirmed that these organic materials were adsorbed on the minerals surface. Complimentary analyses of froth characteristics, particle size distribution and fine particles entrainment were also conducted to explain the cause of the negative effect of these organic materials on flotation. The flotation results were explained in terms of the decrease in the hydrophobicity of the mineral surfaces due to the adsorption of hydrophilic groups in these organic materials which then prevent bubble-particle adhesion. The larger detrimental effect of humic acid is due to its higher adsorption on the minerals, high molecular weight and carbon content compared with the other organic acids used.

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“…These results indicated that the formation of PbSO 4 led to the low bioleaching of Pb, and the presence of jarosite actually affected the kinetics or dissolution of multi-metals (for example, a high concentration of Fe 2+ ). 39 The results of the FTIR spectrum in Fig. 7b again indicated the appearance of the band of SO 4 2À related to PbSO 4 near 1087 cm À1 in the bioleached residues.…”

Section: Brine Leaching Pb From Bioleached Residuesmentioning

confidence: 71%

Effective multi-metal removal from plant incineration ash via the combination of bioleaching and brine leaching

Tian

Liu

et al. 2020

RSC Adv.

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Adsorption of biosolids and their main components on chalcopyrite, molybdenite and pyrite: Zeta potential and FTIR spectroscopy studies

Cited by 81 publications

References 24 publications

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

Effective multi-metal removal from plant incineration ash via the combination of bioleaching and brine leaching

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