Studies on the effect of electrode plate position and feed temperature on the tribo-electrostatic separation of high ash Indian coking coal

Dwari, Ranjan; Mohanta, S.; Rout, B.; Soni, Rahul; Reddy, P. R.; Mishra, B.K.

doi:10.1016/j.apt.2014.08.001

Cited by 38 publications

(6 citation statements)

References 72 publications

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“…In addition, excessively charged particles cause an electrostatic discharge, which can pose the risk of fire and explosion hazards [9]. On the other hand, charged particles can be used for many industrial applications, including electrophotography [10], electrostatic powder coating [11], electrostatic separation [12,13], self-assembly [14], and various measurements [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Advanced characterization of particles triboelectrically charged by a two-stage system with vibrations and external electric fields

Mizutani

Yasuda

Matsusaka

2015

Advanced Powder Technology

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a b s t r a c tIn this study, we propose a new method to effectively characterize particle tribocharging caused by repeated contact with a wall in an external electric field. We perform experiments using a two-stage system consisting of two inclined vibrating plates and electrodes. The mass flow rate and charge of particles were controlled at the first vibrating plate, and the charge that was transferred from the plate to the particles was obtained from the difference between the charges on particles at the lower and upper ends of the second vibrating plate. In addition, electric currents generated by the charge transfer were simultaneously measured at the second vibrating plate. From these measurements, we verified that the charge balance in this system holds. Furthermore, we found that the charge transfer depends on various factors, such as the initial charge, chemical and electrical properties, travel length of particles, and the external electric field. We also found that the equilibrium charge of particles depends on the chemical property and external electric field. The equilibrium charge and the rate of tribocharging were evaluated analytically from the relationship between the initial and transferred charges without changing the travel distance of particles. This method enables the rapid and reliable analysis of the particle tribocharging process.

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Section: Introductionmentioning

confidence: 99%

Advanced characterization of particles triboelectrically charged by a two-stage system with vibrations and external electric fields

Mizutani

Yasuda

Matsusaka

2015

Advanced Powder Technology

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“…When charged particles with the same polarity are extracted from the revised system, these particles are dispersed by their mutual electrostatic repulsion (Masuda, 2009). There are many electrostatic applications for the control of particle position (Matsusaka et al, 2008), separation (Dwari et al, 2015), classification (Kawamoto, 2008), and surface cleaning (Mazumder et al, 2007;Kawamoto et al, 2011). In addition, there are reports regarding particle levitation using various configurations of electrodes (Adachi et al, 2016;Blajan et al, 2017).…”

Section: Motion Of Charged Particles Between Parallel Electrodes and Other Applicationsmentioning

confidence: 99%

Agglomeration and Dispersion Related to Particle Charging in Electric Fields

Shoyama

Matsusaka

2021

KONA

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Electrostatic forces cause spontaneous movement of charged particles; subsequently, electrostatic technology is attracting attention because of its application in powder handling processes, such as separation, classification, dispersion, and collection. Dielectric and conductive particles are charged by induction in a strong electric field and moved by Coulomb forces. The magnitude and polarity of the transferred charges are controlled by the strength and direction of the electric field. The dielectric particles are also polarized in the electric field, and dipole interactions occur between particles or in the particle layers, complicating the particle behavior. This review paper presents induction charging, agglomeration, levitation, and other behaviors resulting from particle layers in electric fields. A series of particle phenomena occur in parallel electrode systems, which consist of a lower plate electrode and an upper mesh electrode. Charged agglomerates are formed on the particle layers, levitated by the Coulomb forces, and disintegrated with rotation when approaching the mesh electrode. The mechanisms of agglomeration and disintegration have been elucidated in multiple studies, including microscopic observations and theoretical analyses of particle motion, based on numerical calculations of the electric field. Furthermore, a new system is proposed for continuous feeding of dispersed particles using electric fields and vibration.

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“…Triboelectric charging occurs in almost every system involving moving particles: in pneumatic conveying [6,7], fluidized beds [8], dry powder mixing [9], dust storms [10,11], or even during the formation of planets in the orbit [12] In most cases, the triboelectric charging of powders is undesirable. However, this effect can be employed as a novel separation tool for fine and dry powders [13][14][15][16][17][18]. The net amount of charge at the surface of one particle acts as a separation feature.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Contact Number on Triboelectric Separation Selectivity

Landauer

Foerst

2019

Processes

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Triboelectric separation is a promising technology to separate fine powders. To enable triboelectric separation for its application in industry, the impact of the process and product parameters must be examined. In this study, with regards to different wall materials in the charging step (PTFE, POM, PE, PVC, and PMMA), the influence of the powder composition of a binary starch-protein mixture with a protein content of 15 wt.%, 30 wt.% and 45 wt.% was studied. By increasing the protein content in the feed, the separation selectivity increased. No dependency of the empirical triboelectric series was determined for all powder compositions. The variation in the protein content of the initial powder and turbulent flow profiles results in a variation in the contact number of particles calculated. An increase in the contact number of particles leads to an increase in the protein content separated on the cathode, whereas the protein content on the anode is only slightly affected. These findings underpin the assumption that particle-particle interaction plays a decisive role in triboelectric charging of fine powders.

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Studies on the effect of electrode plate position and feed temperature on the tribo-electrostatic separation of high ash Indian coking coal

Cited by 38 publications

References 72 publications

Advanced characterization of particles triboelectrically charged by a two-stage system with vibrations and external electric fields

Advanced characterization of particles triboelectrically charged by a two-stage system with vibrations and external electric fields

Agglomeration and Dispersion Related to Particle Charging in Electric Fields

Influence of Particle Contact Number on Triboelectric Separation Selectivity

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