The effect of dissolved mineral species on bastnäsite, monazite and dolomite flotation using benzohydroxamate collector

Espiritu, E.R.L.; Silva, Gilberto Rodrigues da; Azizi, Dariush; Larachi, Faı̈çal; Waters, Kristian E.

doi:10.1016/j.colsurfa.2017.12.038

Cited by 87 publications

(25 citation statements)

References 52 publications

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“…Joint spectroscopic-computational studies have recently begun to reveal adsorption structures and energies on bastnäsite surfaces ( Espiritu et al., 2018 ). Wanhala et al., for instance, explored the mechanisms of adsorption of octyl hydroxamic acid to bastnäsite as a function of hydroxamic acid coverage ( Wanhala et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

A Molecular-Scale Approach to Rare-Earth Beneficiation: Thinking Small to Avoid Large Losses

et al. 2020

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Summary Separating rare-earth-element-rich minerals from unwanted gangue in mined ores relies on selective binding of collector molecules at the interface to facilitate froth flotation. Salicylhydroxamic acid (SHA) exhibits enhanced selectivity for bastnäsite over calcite in microflotation experiments. Through a multifaceted approach, leveraging density functional theory calculations, and advanced spectroscopic methods, we provide molecular-level mechanistic insight to this selectivity. The hydroxamic acid moiety introduces strong interactions at metal-atom surface sites and hinders subsurface-cation stabilization at vacancy-defect sites, in calcite especially. Resulting from hydrogen-bond-induced interactions, SHA lies flat on the bastnäsite surface and shows a tendency for multilayer formation at high coverages. In this conformation, SHA complexation with bastnäsite metal ions is stabilized, leading to advanced flotation performance. In contrast, SHA lies perpendicular to the calcite surface due to a difference in cationic spacing. We anticipate that these insights will motivate rational design and selection of future collector molecules for enhanced ore beneficiation.

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Section: Introductionmentioning

confidence: 99%

A Molecular-Scale Approach to Rare-Earth Beneficiation: Thinking Small to Avoid Large Losses

et al. 2020

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“…Although it is useful and powerful, flotation involves extremely complicated dynamic processes with various phase components (gas, liquid and solid) under flow; examples include the attachment of solid minerals to gas bubbles, the mixing of solid minerals under vigorous liquid flows, the formation of gas bubbles and the motion of bubbles due to buoyant force; none of which are completely understood. Furthermore, other components such as collectors and frothers are necessary addition [6][7][8] and the flows involved in this process are usually turbulent [9][10][11]. This complex problem is challenging to control thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Application of Depletion Attraction in Mineral Flotation: I. Theory

et al. 2018

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We investigate the role of depletion interactions in the particle–bubble interactions that determine the attachment capability of particles on the bubble surface in flotation. In this article, we propose a theoretical model that explains how this attractive interaction could enhance flotation efficiency. Two optimum conditions are determined for the concentration and molecular weight of the depletion agent. The optimum concentration can be determined through the extent of surface activity of the depletion agents. The magnitude of the depletion attraction increases as the concentration increases; however, an increase in the concentration simultaneously enhances its surface concentration. The bubble surface adsorption of the depletion agent results in polymer brushes on the bubble surface that produce a large repulsive interaction. In contrast, the optimal molecular weight of the depletion agents is given by the interaction between the depletion agent sizes, which is determined by its molecular weight and Debye length which is determined by the solution ionic strength. We demonstrate that exploiting this depletion interaction could significantly enhance the flotation efficiency and in principal could be used for any particle system.

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“…Ce is the major REE on the surface of monazite and serves as the active site for adsorption of hydroxamic acid type reagents ( Zhang and Honaker, 2017 ). As shown in Figure 7A , on the monazite surface without treatment with reagents, the XPS spectrum of Ce3d displays two peaks at 903.65 eV (3d3/2) and 885.46 eV (3d5/2) BE, ascribed to the Ce 3+ ions in the monazite lattice ( Espiritu et al, 2018 ). The peak shifts of Ce3d3/2 and Ce3d5/2 are +0.07 eV and +0.07 eV when Fe 3+ was introduced into the pulp ( Figure 7B ).…”

Section: Resultsmentioning

confidence: 99%

Surface Mechanism of Fe3+ Ions on the Improvement of Fine Monazite Flotation With Octyl Hydroxamate as the Collector

Zheng¹,

Qian

Zou

et al. 2021

Front. Chem.

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Froth flotation of fine minerals has always been an important research direction in terms of theory and practice. In this paper, the effect and mechanism of Fe3+ on improving surface hydrophobicity and flotation of fine monazite using sodium octyl hydroxamate (SOH) as a collector were investigated through a series of laboratory tests and detection measurements including microflotation, fluorescence spectrum, zeta potential, and X-ray photoelectron spectroscopy (XPS). Flotation tests have shown that fine monazite particles (−26 + 15 μm) cannot be floated well with the SOH collector compared to the coarse fraction (−74 + 38 μm). However, adding a small amount of Fe3+ to the pulp before SOH can significantly improve the flotation of fine monazite. This is because the addition of Fe3+ promotes the adsorption of SOH and greatly improves the hydrophobicity of the monazite surface. This can result in the formation of a more uniform and dense hydrophobic adsorption layer, as shown by the fluorescence spectrum and zeta potential results. From the XPS results, Fe3+ reacts with surface O atoms on the surface of monazite to form a monazite–Osurf–Fe group that acts as a new additional active site for SOH adsorption. A schematic model was also proposed to explain the mechanism of Fe3+ for improving surface hydrophobicity and flotation of fine monazite using octyl hydroxamate as a collector. The innovative point of this study is using a simple reagent scheme to float fine mineral particles rather than traditional complex processes.

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The effect of dissolved mineral species on bastnäsite, monazite and dolomite flotation using benzohydroxamate collector

Cited by 87 publications

References 52 publications

A Molecular-Scale Approach to Rare-Earth Beneficiation: Thinking Small to Avoid Large Losses

A Molecular-Scale Approach to Rare-Earth Beneficiation: Thinking Small to Avoid Large Losses

Application of Depletion Attraction in Mineral Flotation: I. Theory

Surface Mechanism of Fe3+ Ions on the Improvement of Fine Monazite Flotation With Octyl Hydroxamate as the Collector

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