Corona Electrostatic Separation
Frontiers | Evaluation of Electrostatic Separation of …
In any case, the additional financial investment, as well as per-sample time and effort related to electrostatic separation has to be taken into account. A simple density separation (hand-shaking) in a separation funnel is efficient to up to ∼50 g of sediment (lower for organic-rich samples).
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Chapter 4 Electrostatic Separation
separation efficiency of electrostatic machines, including electrodes geometry, rotor diameter, rotational speed, voltage, electrode polarity, particle density, and splitter position [14].
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Examination of voltage-current characteristics of corona …
Electrostatic precipitators are widely used in industrial plants to fulfill the requirements of the limitation of dust emissions due to their good separation efficiency. However, the separation efficiency is depending a lot on the particle sizes. Our article was based on the field experience of an ESP with a reduced separation efficiency, in which the firing technology changed. As a …
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Charges and forces on conductive particles in roll-type corona
Mathematical modeling is a powerful tool in the optimization of electroseparation technologies and equipments. This paper proposes the use of a numerical method of field analysis to evaluate more accurately the charges and forces on millimeter-size conductive particles of virtually any shape in tact with an electrode.
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Electric Separation
Electric separation is the process of separating minerals based on their different electrical properties, which is composed of the mineral electrification process and separation process. ... In 1901, American scientists H. M. Sutton and W. L. Steele combined corona and electrostatic fields to invent rotor electrostatic separator, which laid the ...
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Electrostatic Separation
Therefore, electrostatic separation of postconsumer plastics in e-waste is only applied to fractions obtained by preceding processes (e.g. sink and float fractions). ... The following describes the waste particle separation process in the equipment's corona-electrostatic composite electric field. The waste is fed evenly into the roller by the ...
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Application of Chloride Metallurgy and Corona Electrostatic …
However, how to effectively and in an environmentally friendly manner recycle waste MLCCs is seldom considered. This study developed an efficient and integrated process …
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Optimizing the operating parameters of corona electrostatic separation
Compared with traditional process the corona electrostatic separation (CES) had no waste water or gas during the process and it had high productivity with a low-energy cost. In this paper, the roll-type corona electrostatic separator was used to separate metals and nonmetals from scraped waste PCBs. The software MATLAB was used to simulate the ...
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Corona–Electrostatic Separation: An Efficient Technique for …
The efficiency of corona–electrostatic separation as a basic operation of a recycling flowsheet has been demonstrated for feedrates not exceeding 200 kg/hour. At the same time, it has been proved that electroseparation can represent a complement to conventional air–gravity separation of metals and insulators from industrial wastes. The in ...
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Corona–Electrostatic Separation: An Efficient Technique for …
The efficiency of corona–electrostatic separation as a basic operation of a recycling flowsheet has been demonstrated for feedrates not exceeding 200 kg/hour. At the same time, it has …
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A new two-roll electrostatic separator for recycling of …
The electrostatic separation is an effective method for recycling waste electrical and electronic equipment (WEEE). The efficiency of electrostatic separation processes depends on the ability of the separator. As a classical one, the roll-type corona-electrostatic separator has some advantages in recycling metals and plastics from waste printed circuit board (PCB).
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Premises for the mathematical modeling of the combined corona …
Corona and induction charging mechanisms are frequently associated in modern roll-type electrostatic separators. Various electrode configurations have been proposed and numerous attempts have been made in order to fully characterize them. This paper approaches this problem from a computational point of view. The boundary-element method is employed …
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Electrostatic Separation for Recovering Metals and …
Electrostatic separation is an effective and environmentally friendly method for recycling comminuted waste printed circuit boards (PCB). As a classical separator, the roll-type corona-electrostatic separator (RTS) has some advantages in this field. However, there are …
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Supporting Information Application of chloride …
Application of chloride metallurgy and corona electrostatic separation for recycling waste multi-layer ceramic capacitors Bo Niu and Zhenming Xu* School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China Supporting Information Content Figure S1.
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Simulation of Corona Electrostatic Separator for End-of-Life …
The corona electrostatic separation is one of the methods that can be used for this purpose since it is able to separate the conductive and non-conductive materials. …
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Increasing the Recovery Rate of Metals from WEEE by Corona
The aim of the paper is to show the possibility of using electrostatic technologies for the recovery of non-ferrous metals from the non-conductive fraction obtained in the recycling process of waste electrical and electronic equipment (WEEE). Prior to electrostatic separation, the material undergoes in-situ operations such as size reduction and dust and light component removal. …
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Real-time monitoring system for improving corona electrostatic …
Although corona electrostatic separation is successfully used in recycling waste printed circuit boards in industrial applications, there are problems that cannot be resolved completely, such as nonmetal particle aggregation and spark discharge. Both of these problems damage the process of separation and are not easy to identify during the ...
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High-voltage supplies for corona-electrostatic separators
The selection of the high-voltage supply can play an important role in the optimization of electrostatic separation processes. The present work aimed to evaluate the influence of the main high-voltage parameters (waveform, polarity, level) on the efficiency of electroseparation, in the case of insulation-metal granular mixtures.
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Numerical investigation of the separation mechanism in an electrostatic …
Many studies have been conducted on the modeling and simulation of the corona discharge and electrostatic aerosol precipitation in gas [3, 13–17]. However, electrostatic aerosol separation onto the liquid surface has rarely been studied except by Pardon et al who attempted the numerical simulation of the electrostatic ATH sampler. They ...
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Producing usable materials from e-waste | Environmental …
Xu and his colleagues are focusing on how a technology known as corona electrostatic separation, which is widely used in the mining industry, can be used for separating waste PCBs ( Environ. Sci. Technol. 2007, 41, 1995−2000; 2008, 42, 624−628). The technology separates materials on the basis of the particles' ability to conduct electricity.
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A roll‐type corona discharge–electrostatic separator for separating
Experimental tests are conducted to determine the separation performance of a roll-type corona apparatus with 10, 15, 20, 25, and 30 kV voltages at 50, 70, and 90 rpm drum rotational speeds. ... The results of this study can be used in configuration optimization design of "Corona Type Cylindrical Electrostatic Separation" for separating ...
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Electric potential distribution at the surface of insulating …
The presence of grounded strips reduces the electric wind, which is associated to corona discharge but not tolerated in such processes that involve micronized materials. At the same time, it improves the corona charging conditions of non-conductive materials and as consequence the overall efficiency of the corona-electrostatic separation process.
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Experimental study of a modified dual-type high-voltage …
Reduction of ionic wind effects represents a major issue for the corona-electrostatic separation of fine and micronized particles. The use of grounded strips associated to the corona electrode could fix the problem in such electrostatic process. The electrode arrangement studied in the present paper may be an effective solution for the recovery ...
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A roll‐type corona discharge–electrostatic separator for …
Experimental tests are conducted to determine the separation performance of a roll-type corona apparatus with 10, 15, 20, 25, and 30 kV voltages at 50, 70, and 90 rpm drum …
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Electric potential distribution at the surface of insulating …
1. Introduction. Corona discharge is widely used in a variety of electrostatic process applications [1], [2], including dust precipitation [3], separation of granular mixtures [4], [5] and the treatment of polyethylene films for cable insulation [6], [7].Several research groups have studied the charging mechanism of insulating materials by corona discharge in various …
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Optimal high-voltage energization of corona-electrostatic …
The selection of the high-voltage supply can play an important role in the optimization of electrostatic separation processes. This paper aims to evaluate the influence of the main high-voltage parameters (waveform, polarity, level) on the efficiency of electrostatic separation, in the case of insulation-metal granular mixtures. A roll-type laboratory high-tension separator was …
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Electrostatic Separation
In the electrostatic separation process, particles are selectively charged during corona discharge or as a result of sufficiently strong contact between particles themselves and/or against suitable surfaces (triboelectrostatic separation).
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Corona-assisted plate-type electrostatic separation process …
Plate-type electrostatic separators are commonly employed for the selective sorting of conductive and non-conductive granular materials. Unfortunately, the purity of the conductive products is often compromised by the fact that the trajectories of the non-conductive granules cannot be controlled. The aim of the present work is to validate a relative simple solution to …
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Application of Chloride Metallurgy and Corona Electrostatic Separation
However, how to effectively and in an environmentally friendly manner recycle waste MLCCs is seldom considered. This study developed an efficient and integrated process for recovering valuable materials from waste MLCCs by chloride metallurgy (CM) and corona electrostatic separation (CES). In CM, NH4Cl was used as the chlorinating agent.
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Electrostatic separation of metals and plastics from …
Recycling of metals and plastics from wastes is one of the major applications of the electrostatic separation technologies. The paper analyses the multitude of factors that affect the efficiency of this technique, to establish design principles and formulate operation recommendations. The theoretical analysis of corona and induction charging of, respectively, insulating and …
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