Relationship of petroleum hydrocarbon characteristics and molybdenite flotation

Smit, F.J.; Bhasin, Amit

doi:10.1016/0301-7516(85)90021-3

Cited by 28 publications

(12 citation statements)

References 7 publications

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“…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]. Apparently, the zeta potential in Figure 5 was mainly controlled by molybdenite edges on which diesel were not adsorbed.…”

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

confidence: 99%

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%

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

Wan

Yang

Cao³

et al. 2017

Minerals

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“…The hydrophilic edges have a deleterious influence on molybdenite floatability. Nonpolar hydrocarbon oils (saturated hydrocarbons) such as kerosene, diesel oil, transformer oil and solar oil are normally used as molybdenite flotation collectors [6][7][8][9]. However, they only adsorb on the nonpolar face of molybdenite by hydrophobic interactions and van der Waals forces [10][11][12][13][14][15], because the surface energy of nonpolar hydrocarbon oils is similar to that of molybdenite faces.…”

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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“…They also found coarse molybdenite particles (120 Â 200 mesh) float extremely rapidly and completely without being influenced by heterocoagulation, but the flotation of fine molybdenite particles (minus 200 mesh) was sensitive to particle size and heterocoagulation, and overgrinding of molybdenite created very rough surfaces to reduce its floatability. Smit and Bhasin (1985) discovered that a two-component blend of a higher molecular-weight petroleum hydrocarbon and a lower molecular-weight diluent oil could be a better molybdenite collector than a single component of higher molecular-weight oil. Furthermore, the flotation oils blended from naphthenic base stock gave superior flotation results whereas those blended from aromatic stock resulted in inferior molybdenite flotation.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for preferential flotation recovery of molybdenite from a porphyry copper–molybdenum ore

Zhong

Cao

et al. 2012

Minerals Engineering

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Relationship of petroleum hydrocarbon characteristics and molybdenite flotation

Cited by 28 publications

References 7 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

A novel approach for preferential flotation recovery of molybdenite from a porphyry copper–molybdenum ore

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