Review of the flotation of molybdenite. Part I: Surface properties and floatability

Castro, Saturnino Sanz de; López–Valdivieso, Alejandro; Laskowski, J.

doi:10.1016/j.minpro.2016.01.003

Cited by 145 publications

(69 citation statements)

References 45 publications

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“…Obviously, the adsorption of diesel on molybdenite had little effect on the zeta potential of molybdenite. It has been documented that molybdenite edges are hydrophilic and composed of Mo-S bonds, while molybdenite faces are hydrophobic and composed of S-S bonds [10,15,21]. Oily collectors such as kerosene, diesel oil, transformer oil, and solar oil only adsorb on molybdenite faces through hydrophobic interactions and van der Waals forces [11,[21][22][23].…”

Section: Scanning Electron Microscopy and Energy Dispersive X-ray Spementioning

confidence: 99%

“…It has been found that calcium ions can adsorb on molybdenite as a result of electrostatic interactions and then increase the zeta potential of molybdenite or even reverse the zeta potential from negative to positive [11].Adsorbed calcium ions are attractive to negatively charged fine quartz or other gangue particles, deteriorating molybdenite flotation. These studies were conducted on Cu-Mo ores with bulk flotation of Cu and Mo at high pH and molybdenite recovered as a by-product [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

Wan

Yang

Cao³

et al. 2017

Minerals

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Abstract:In this paper, the influence of Ca 2+ on the flotation of a skarn type molybdenum ore and pure molybdenite mineral at pH 8 was studied using diesel as the collector. It was found that Ca 2+ had little effect on molybdenum flotation at low concentrations. By further increasing Ca 2+ concentration, the floatability of molybdenite-especially from the fine size fractions-was depressed even without the presence of fine gangue minerals. The mechanism responsible for the deleterious effect of Ca 2+ on molybdenite flotation was studied by a range of techniques including zeta potential measurements, Scanning Electron Microscopy, and Energy Dispersive X-ray Spectrometer (SEM-EDS) analyses and molybdenum phase analyses. It was found that Ca 2+ interacted with molybdenite edges producing CaMoO 4 precipitates which were responsible for the depression of molybdenite flotation of Ca 2+ by preventing the adsorption of diesel.

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Section: Scanning Electron Microscopy and Energy Dispersive X-ray Spementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

Wan

Yang

Cao³

et al. 2017

Minerals

View full text Add to dashboard Cite

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“…Molybdenite is anisotropic due to its layered structure [1,2]. It exhibits two types of surfaces, namely face and edge, resulting from the break of S-S molecular bonds (nonpolar faces) and the rupture of the strong covalent Mo-S bonds (polar edges), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the hydrophobicity of molybdenite edges cannot be improved by nonpolar hydrocarbon oils [16,17]. Some studies show that molybdenite edges could interact with some metal ions existing in flotation pulp, which reduces In the past, the surfactant or xanthate was mixed with a nonpolar hydrocarbon oil to increase the molybdenite flotation [2,[22][23][24][25][26]. The surfactant or xanthate could absorb on molybdenite edges to improve their hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Ca2+ and pH on the Interaction between PAHs and Molybdenite Edges

Wan

Yang

et al. 2017

Minerals

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Nonpolar hydrocarbon oils are widely used as collectors for floating molybdenite. However, they can only adsorb on molybdenite faces and not on molybdenite edges, resulting in limited molybdenite recovery, especially in processed water containing a high amounts of Ca 2+ . In this study, the influence of Ca 2+ and pH on the adsorption of polycyclic aromatic hydrocarbons (PAHs), as part of composite collection on molybdenite edges, was studied. It was found that PAHs could only adsorb on molybdenite edges in the presence of Ca 2+ . Ca 2+ reacted with molybdenite edges to form CaMoO 4 precipitates. Then, CaMoO 4 precipitates interacted with PAHs to form a structure of π-cation-π by (1) the cation-π interaction, (2) the π-π interaction and (3) the electrostatic interaction. It was also found that CaMoO 4 precipitates on molybdenite edges promoted the adsorption of PAHs. The more the CaMoO 4 precipitates, the easier the PAHs adsorption occurred. As a result, the high amount of Ca 2+ and low pH enhanced the adsorption of PAHs on molybdenite edges. This study provides insights into reducing the deleterious effect of Ca 2+ on fine molybdenite flotation.

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“…In the case of adding lime or another alkalizing agent, colloidal precipitates of these ions are produced which prevent the recovery of some relevant species such as molybdenite (MoS 2 ) [88][89][90][91]. In addition, the Cl − ion can react with the Fe 2+ ions present to create FeCl 2 .…”

Section: Precipitation Of Ions From Wastewater and Seawatermentioning

confidence: 99%

Biomineralization Mediated by Ureolytic Bacteria Applied to Water Treatment: A Review

2017

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Abstract:The formation of minerals such as calcite and struvite through the hydrolysis of urea catalyzed by ureolytic bacteria is a simple and easy way to control mechanisms, which has been extensively explored with promising applications in various areas such as the improvement of cement and sandy materials. This review presents the detailed mechanism of the biominerals production by ureolytic bacteria and its applications to the wastewater, groundwater and seawater treatment. In addition, an interesting application is the use of these ureolytic bacteria in the removal of heavy metals and rare earths from groundwater, the removal of calcium and recovery of phosphate from wastewater, and its potential use as a tool for partial biodesalination of seawater and saline aquifers. Finally, we discuss the benefits of using biomineralization processes in water treatment as well as the challenges to be solved in order to reach a successful commercialization of this technology.

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Review of the flotation of molybdenite. Part I: Surface properties and floatability

Cited by 145 publications

References 45 publications

The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

The Interaction between Ca2+ and Molybdenite Edges and Its Effect on Molybdenum Flotation

The Influence of Ca2+ and pH on the Interaction between PAHs and Molybdenite Edges

Biomineralization Mediated by Ureolytic Bacteria Applied to Water Treatment: A Review

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