Changing potential for the electrical beneficiation of minerals by chemical pretreatment

Manouchehri, Hamid-Reza; Rao, K. Hanumantha; Forssberg, K.S.E.

doi:10.1007/bf03402814

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…This may affect the particle trajectories and the powder dynamics through the matrix and the performance of the separator. Some researchers [10,11] found that the average charges of calcite and quartz after tribo-electrification with various material surfaces in the charger are rather different.…”

Section: Comparison Of the Resultsmentioning

confidence: 99%

Purification of Fine Powders by a Superconducting HGMS With Vibration Assistance

Wang

Johansson

Forssberg

et al. 2000

Physical Separation in Science and Engineering

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In this study, a superconducting high gradient magnetic separator (HGMS) with a matrix vibration system in dry mode was utilised to purify fine calcite and quartz powders smaller than 38 ktm. The effects of the operating parameters (particle size, magnetic field/average air velocity (Bo/Vo), the amplitude of vibration as well as the aperture size of the expanded metal matrix) have been presented. The mechanicallybased matrix vibration with the air blowing was recognised to be effective for dry purification of fine powdered materials at high magnetic fields. The function of the matrix vibration has been discussed. In addition, the results have been empirically correlated with the operating parameters used for the purification in the separator.

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Section: Comparison Of the Resultsmentioning

confidence: 99%

Purification of Fine Powders by a Superconducting HGMS With Vibration Assistance

Wang

Johansson

Forssberg

et al. 2000

Physical Separation in Science and Engineering

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“…For instance, the solid HMs that are being processed by triboelectric separators may be in any combination form of mineral particles such as conductors, semi-conductors and non-conductors. Hence, the triboelectric separators are being considered to have a more wide potential than the HTR (corona) separation in the sense that only the conducting mineral particles (conductors) are being separated from the non-conducting mineral particles (non-conductors) [ 154 , [164] , [165] , [166] , [167] , [168] , [169] ].…”

Section: Electrostatic Concentrationmentioning

confidence: 99%

Physical beneficiation of heavy minerals – Part 2: A state of the art literature review on magnetic and electrostatic concentration techniques

Nzeh,

Popoola

2024

Heliyon

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“…In parallel, work function is defined as the energy barrier required to move a free electron from the Fermi level of the solids to the infinity, and is used as an important indicator of electron binding energy 11 , 12 . In planetary sciences, the mineral work function has been applied to interprete the electrostatic migration of charging lunar dust, the contact electrification phenomenon during electrical beneficiation and the energy threshold of emitting photoelectrons 13 – 15 . The electronegativity of atoms and work function of minerals could also be applied to quantitatively evaluate the electron transfer tendency and directions under high pressures such as explaining some intricate redox interactions among minerals, fluids, melts and volatiles in Earth’s deep region up to ~350 gigapascals (GPa) 6 , 16 .…”

Section: Introductionmentioning

confidence: 99%

Electron transfer rules of minerals under pressure informed by machine learning

Wang

et al. 2023

Nat Commun

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Electron transfer is the most elementary process in nature, but the existing electron transfer rules are seldom applied to high-pressure situations, such as in the deep Earth. Here we show a deep learning model to obtain the electronegativity of 96 elements under arbitrary pressure, and a regressed unified formula to quantify its relationship with pressure and electronic configuration. The relative work function of minerals is further predicted by electronegativity, presenting a decreasing trend with pressure because of pressure-induced electron delocalization. Using the work function as the case study of electronegativity, it reveals that the driving force behind directional electron transfer results from the enlarged work function difference between compounds with pressure. This well explains the deep high-conductivity anomalies, and helps discover the redox reactivity between widespread Fe(II)-bearing minerals and water during ongoing subduction. Our results give an insight into the fundamental physicochemical properties of elements and their compounds under pressure.

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Changing potential for the electrical beneficiation of minerals by chemical pretreatment

Cited by 8 publications

References 8 publications

Purification of Fine Powders by a Superconducting HGMS With Vibration Assistance

Purification of Fine Powders by a Superconducting HGMS With Vibration Assistance

Physical beneficiation of heavy minerals – Part 2: A state of the art literature review on magnetic and electrostatic concentration techniques

Electron transfer rules of minerals under pressure informed by machine learning

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