Special Issue "Mineral Flotation"

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Analysis of Energies".

Deadline for manuscript submissions: 30 June 2023 | Viewed by 2432

Special Issue Editor

Prof. Dr. Qicheng Feng
E-Mail Website
Guest Editor
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
Interests: mineral separation; flotation reagents; surface analysis; leaching; industrial wastewater treatment; mineral surface chemistry; process mineralogy; comprehensive utilization of mineral resources

Special Issue Information

Dear Colleagues,

Mineral resources play a critical role in various material applications. Flotation is a practical technique to separate valuable minerals from gangue minerals based on differences in physical and chemical properties on mineral surfaces. Flotation reagents, such as collectors, activators, depressants, frothers, regulators, etc., are commonly employed in the recovery of valuable minerals. The gradual depletion of high-grade mineral resources has made complicated and refractory ores an alternative source to meet market demands. Thus, there is a crucial need for research on the theory and application of flotation to address the issues in the separation of valuable minerals from gangue minerals. This Special Issue will focus on recent advances in flotation theory, reagents, and techniques. Research or review articles concerning the crystal structures of typical minerals, DFT calculation, synthesis of flotation reagents, interaction of flotation reagents with mineral surfaces, enhanced flotation methods, solution chemistry of flotation, aggregation, and dispersion of minerals, flotation applications, and plant practice are invited to this Special Issue. The issue will contribute to the understanding of these processes and the development of novel approaches to improve the flotation recovery of valuable mineral resources from complicated and refractory ores.

Prof. Dr. Qicheng Feng
Guest Editor

Manuscript Submission Information

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Keywords

  • flotation
  • adsorption
  • sulfide minerals
  • oxide minerals
  • surface chemistry
  • flotation reagents
  • bubble-particle interaction
  • theoretical calculation
  • surface analysis
  • process mineralogy

Published Papers (4 papers)

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Research

Article
Effect of Fluoride Ions on the Surface Dissolution of Vanadium-Bearing Biotite
Separations 2022, 9(12), 422; https://doi.org/10.3390/separations9120422 - 08 Dec 2022
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Abstract
In shale vanadium ore, vanadium is mainly formed as a low-V(III) homogeneous phase to partially replace Si and exists in the lattice structure of aluminosilicate minerals such as biotite. During the acid leaching of shale vanadium ore, an activator is needed to effectively [...] Read more.
In shale vanadium ore, vanadium is mainly formed as a low-V(III) homogeneous phase to partially replace Si and exists in the lattice structure of aluminosilicate minerals such as biotite. During the acid leaching of shale vanadium ore, an activator is needed to effectively extract vanadium. Using biotite as a tetrahedral structure doped with Aluminum-Silicon tetrahedron structure, the interaction between leaching-agent ions (H+), activator ions (F), and vanadium-containing biotite surface was discussed by DFT quantum chemical calculations. The dissolution behavior of activator fluoride ions on the surface of vanadium-bearing biotite during sulfuric acid leaching was revealed. According to the simulated leaching results, the oxygen on the biotite surface first absorbed hydrogen ions to undergo complete hydroxylation, and then combined with hydrogen ions to form water molecules. However, in the presence of activator (NaF), fluoride ions were adsorbed on the surface cations, which catalyzed the formation of water molecules and promoted the dissolution of surface cations. SEM–EDS analysis showed that the surface of vanadium-bearing minerals became very irregular, and the number of voids and cracks greatly increased. At the same time, XPS showed that the addition of activator fluoride ions destroyed the Al-O tetrahedron structure. Many Al and V atoms dissolved in the solution, which improved the leaching rate of vanadium. Full article
(This article belongs to the Special Issue Mineral Flotation)
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Article
Interaction of Manganese Ions with Scheelite Surfaces and Its Effect on Collector Adsorption and Flotation
Separations 2022, 9(11), 365; https://doi.org/10.3390/separations9110365 - 10 Nov 2022
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Abstract
Tungsten is a commercially important metal element that usually coexists with a variety of non-ferrous metals, which makes its extraction difficult. Scheelite is a commonly occurring tungsten-containing ore with the formula CaWO4. Improving the surface properties of scheelite to increase its [...] Read more.
Tungsten is a commercially important metal element that usually coexists with a variety of non-ferrous metals, which makes its extraction difficult. Scheelite is a commonly occurring tungsten-containing ore with the formula CaWO4. Improving the surface properties of scheelite to increase its adsorption of the collector for flotation separation is the focus of our current research. In this paper, the effects of manganese ions on scheelite flotation in benzohydroxamic acid (BHA) system were studied by micro-flotation tests, adsorption tests, fourier transform infrared spectroscopy (FTIR), zeta potential, and X-ray photoelectron spectroscopy (XPS) analysis. The addition of Mn2+ was found to improve the recovery of scheelite. The addition of Mn2+ greatly improved the recovery of scheelite. Infrared spectroscopy, adsorption tests, zeta potential measurements and XPS analysis all confirmed that BHA had a higher adsorption capacity and a stronger bond to the surface of scheelite after the addition of manganese ions, increasing the floatability of scheelite particles. Therefore, Mn2+ shows great potential for the improvement of the flotation index of scheelite in a system with BHA. Full article
(This article belongs to the Special Issue Mineral Flotation)
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Article
The Nonlinear Dynamic Behavior of a Particle on a Vibrating Screen Based on the Elastoplastic Contact Model
Separations 2022, 9(8), 216; https://doi.org/10.3390/separations9080216 - 12 Aug 2022
Viewed by 574
Abstract
The dynamic response of particles is closely related to screening efficiency. To study the dynamic response of particles, the dynamic equations of a particle on a screening surface are established based on the elastoplastic contact model of spherical particles and are solved for [...] Read more.
The dynamic response of particles is closely related to screening efficiency. To study the dynamic response of particles, the dynamic equations of a particle on a screening surface are established based on the elastoplastic contact model of spherical particles and are solved for the coal particle. Then, the trajectories of the particles are given with different falling heights and particle radii. The completely different trajectories with slight changes in the falling height and particle radius indicate strong nonlinearity. Second, the nonlinear dynamic behavior under different amplitudes and frequencies is discussed, and the route of transition from quasiperiodic motion to chaotic motion is revealed. Finally, we discuss the average speed along the screening surface considering the frequency, amplitude, friction coefficient, inclination angle, and vibration direction angle. In addition, the convergence conditions of particle motion are proposed, and they are only affected by the inclination angle and friction angle. The results show that in the normal direction of the vibrating screen, the particle motion is quasiperiodic at low frequencies. With increasing frequency, the motion of the particle becomes chaotic, and its Poincaré map becomes petal-shaped. In addition, the number of petals increases at the mutation of the bifurcation diagram. The increase in frequency, amplitude and inclination angle and the decrease in friction coefficient lead to an increase in particle speed along the screen surface. In addition, the particle speed reaches a maximum when the vibration direction angle is 65°. This work provides a theoretical basis for controlling the thickness of granular material flow on a vibrating screen and selecting screening process parameters. Full article
(This article belongs to the Special Issue Mineral Flotation)
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Article
Study on Screening Mechanism and Numerical Simulation for Crashed Concrete Particles by Using DEM
Separations 2022, 9(6), 153; https://doi.org/10.3390/separations9060153 - 14 Jun 2022
Viewed by 870
Abstract
Recycling waste concrete has become a large problem in developing countries. The aim of this work is to provide guidance for screening concrete particles and improving screening efficiency. First, the elastoplastic collision model is established for calculating the coefficient of restitution for concrete [...] Read more.
Recycling waste concrete has become a large problem in developing countries. The aim of this work is to provide guidance for screening concrete particles and improving screening efficiency. First, the elastoplastic collision model is established for calculating the coefficient of restitution for concrete particles with different compressive strengths. Then, a bar circular vibrating screen is applied to simulate the screening process of concrete particles by using the discrete element method (DEM). The optimal vibrating parameters, which contain amplitude, frequency and inclination angles, is analyzed for the representative concrete particles containing C15, C45 and C80 by comparing the screening efficiency. The results show that the optimal screening parameters of amplitude and frequency is smaller with the increase in the compressive strength of the concrete particles. Appropriately, the large inclination angle is suitable for screening fine concrete particles with a gap vibrating screen. This work should be helpful for the screening process of concrete waste particles and provides a theoretical basis and simulation case for screening and recycling other particles, such as sand, stone, iron ore and copper ore. In the screening processes of construction wastes, the optimal screening parameters can be selected quickly by calculating the coefficient of restitution and adopting the DEM simulation. Full article
(This article belongs to the Special Issue Mineral Flotation)
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