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Factors That Influence the Efficiency of a Propeller-Type ...

Abstract: This work is focused on the experimental study of a new propeller-type tribocharging device specifically designed to operate in conjunction with an electrostatic separator for mixtures of granular insulating materials. The device consists of two coaxial aluminum propellers rotating in a polyvinyl chloride (PVC) pipe; it has two control variables: the material …

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Experimental Modelling of a New Tribo-electrostatic ...

electrostatic separator is a solution that has already been validated by the recycling industry [ 11, 12]. During recent years, several attempts have been made to improve the efficiency of the existing technologies, which make use of vibrating or …

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Experimental Comparative Study of Different …

The paper aims at optimizing the operation of a free-fall electrostatic separator equipped with a novel tribo-charging device for the processing of granular plastic mixtures.

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The Use of Tribocharging in the Electrostatic ...

The Use of Tribocharging in the Electrostatic Beneficiation of Lunar Simulant Any future lunar base and habitat must be constructed from strong dense materials in order to provide for thermal and radiation protection. Lunar soil may meet this need. Lunar regolith has high concentrations of aluminum, silicon, calcium, iron, sodium, and titanium oxides.

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Electrostatic separation of plastic mixtures ABS/HIPS and ...

tribocharging the granular mixture components with opposite polarity using a tribocharging device (Boukhoulda 2017), then feeding the charged material into the electric field of a free fall electrostatic separator where the granule trajectories are deflected in accordance with the charge amount and polarity.

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Design and Test of a Novel F luidized-bed ... - Electrostatics

use of tribo-electrostatic separators. This paper introduces a novel tribo-aero-electrostatic separator for granular plastic mixtures, characterized by: - a modular fluidized-bed tribocharging device, - two high-voltage electrodes of circular-sector …

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Tribo-aero-electrostatic separator for coarse granular ...

separator in the case of large particles (2 to 4.5 mm), the bottom level of the fluidized bed was set at 20 cm below the bottom edge of the conveyors, so that to increase the residence time of the granules in the tribocharging device. Figure 3. Electrode configuration II: bottom level of the fluidized bed 20 cm

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Optimization of Belt-Type Electrostatic Separation of ...

The aim of the present work is to optimize the design and the operation of such an installation, composed of a belt-type electrostatic separator associated to a propeller-type tribocharging device. The experimental design method is employed for modeling and optimizing the separation of a mixture of high-impact polystyrene and acrylonitrile ...

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Electrostatic separation technology for obtaining plant ...

A typical vertical tribo-electrostatic separator usually consists of feeding, charging, separation, and collection zones (Fig. 1c). While the milled flour is carried by the air flow from the feeding system into the pipeline tribocharging unit, it collides with the inner wall of the pipeline or other particles and becomes charged with different ...

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Electrostatic separation of HIPS/ABS and HIPS/ABS-PC ...

waste in the free-fall electrostatic separator, with prior tribocharging in a fluidized bed device The highest recovery rates and purities were obtained for balanced mixtures In the case of heavily unbalanced mixtures high recovery rate and purity close to 100% were obtained for the majority material concentrate, while the minority material

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Recent Researches in Electrostatic Separation …

the tribocharging chamber is constant, leading to a constant speed of the fluidizing air (Fig. 7.a). (a) (b) FIGURE 6. (a) Shape, dimensions, and characteristics of PA and PC granules. (b) The free fall electrostatic separator equipped with the splayed air chamber of the tribocharging device. (a) (b) FIGURE 7.

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[PDF] The Use of Tribocharging in the Electrostatic ...

The use of tribocharging as a potential method to provide sufficient charge to several different lunar simulants for electrostatic beneficiation was investigated. The objective was to determine whether specific minerals of interest (e.g., ilmenite) that are present in lunar regolith could be enriched in concentration by beneficiation that would therefore allow for more efficient …

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Experimental and numerical analysis of a new tribo ...

The tribo-electrostatic separator with the tribocharging device (all dimensions in cm). As seen in Fig. 2, the collector comprises 6 circular crown-shape compartments of same width equal to 50 mm. According to preliminary experiments, boxes 1,2 were reserved for negatively charged particles, boxes 5,6 for positively charged particles and boxes ...

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i) Conductive Drum Separators - Virginia Tech

1.2.3.2 "Electro-Static" Electrostatic Separators The first electrostatic separators for commercial use employed the principle of contact electrification and they were of this "electro-static" type. These separators were the free-fall plate devices in which charged particles would fall between two near-vertical plates. An electric field was

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Tribocharging and Electrostatic Separation of Mixed ...

The laboratory set-up consists in a free fall electrostatic separator equipped with a fluidized bed tribocharging device, characterized by interchangeable tribocharging chambers.

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Tribo-Aero-Electrostatic Separator for Ternary Mixtures of ...

The electrostatic separation tests carried out on PET and PVC granulates confirmed the effectiveness of the fluidized bed tribocharging device integrated in a free fall separator.

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Electrostatic separation of polymer waste by tribocharging ...

After tribocharging, the output door is opened and polymer waste particles with residual electric charger positive or negative arrive in top of the electrostatic separator device. This section of the apparatus is composed by two electrodes of aluminum in the rectangular shape that are facing each other on an oblique position inside a box of the ...

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Energies | Free Full-Text | Tribo-Electrostatic Separation ...

An electrostatic separator designed and constructed by the authors was used for to the separation. In turn, to assess the effectiveness of this separation, a dedicated vision system was used. Based on the result of the carried out tests, it has been assumed that the proposed approach's effectiveness has been demonstrated by means of empirical ...

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Electrostatic separation of HIPS/ABS and HIPS/ABS-PC ...

HIPS/ABS and HIPS/ABS-PC granular mixtures is composed of a fluidized bed tribocharging device and free-fall electrostatic separator (Fig. 3). The plate electrodes of the separator (1250 mm x 550 mm) are positioned with a 300 …

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Experimental Comparative Study of Different …

Abstract --Several tribocharging devices are commonly used for charging insulating particles in order to separate granular plastic mixtures using vertical triboelectric separator. However, there is no comparative analyze of these devices when tribocharging is achieved in the same climatic conditions and

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Insulating conveyor-belt-type electrostatic separator for ...

A comparison with the same configuration without charging the belt has shown that the performance of the new separator is much better, in terms of recovery and purity rates. A new configuration of tribo-electrostatic separator equipped with an insulating belt conveyor is described and analyzed in this paper. The insulating belt is continually charged by corona discharge …

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Tribocharging of plastics granulates in a fluidized bed device

The electrostatic separation tests carried out on PET and PVC granulates confirmed the effectiveness of the fluidized bed tribocharging device integrated in a free fall separator. They pointed out three charging mechanisms by particle/particle and particle/walls collisions.

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"FUNDAMENTAL IMPROVEMENT IN THE TRIBOCHARGING …

Electrostatic separation has great potential as a fine particle separator (i.e. < 1mm) in industrial minerals processing application, especially in arid areas where water supply is limited. In the current study, particle tribocharging kinetics was evaluated using a model system comprised of copper, pure coal, silica and ceramic.

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A Propeller-Type Tribocharger for Granular Plastics …

charging device specifically designed to operate in conjunction with an electrostatic separator for mixtures of granular insulating materials. The device consists in two coaxial aluminum propellers, rotating in a polyvinyl chloride pipe; it has two control variables: the material feed-rate and the rotation speed of the propellers.

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Experimental Analysis of a Vibrating Tribocharging Device ...

Experimental Analysis of a Vibrating Tribocharging Device of Plastic Particles for a Free-Fall Electrostatic Separator November 2014 IEEE Transactions on …

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ELECTROSTATIC DISCHARGE (ESD) - Tek-Pak, Inc.

ELECTROSTATIC DISCHARGE (ESD) Introduction Electrostatic Discharge (ESD) Properties of Plastic Packaging: Terminology, Standards, and Measurement By: Scott Carter Tek Pak, Inc., The topic of electrostatic discharge (ESD) with regard to plastic packaging of electrically sensitive devices is technically complex.

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Method and apparatus for free fall electrostatic ...

Process and device for controlling the electrostatic separation of crude potash salts in electrostatic free fall separators: : Pfoh et al. 209/127.1: 4557827: Electrostatic free-fall separator with feeding arrangement: : Fricke et al. 4362276: Process and apparatus for recovering metal and plastic from insulated wire: 1982 ...

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Experimental analysis of a cyclone tribocharging device ...

A cyclone can be employed as tribocharging device for free-fall electrostatic separation of granular plastic mixtures. The objective of this work is to validate the possibility of modifying the "standard" operation of such a device, so that the turbine of the cyclone to participate in the charging process of the granules. Thus the granular product is introduced …

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Study of Velocity and Materials on Tribocharging of ...

surface profile of the impacting device, time of impact, and deposition of path-des on the metal iinpactors. The goal of this paper was to perform a study on the tribocharging ptoper-ties of polymer powders by using static mixers made of different materials. The results are to be used in breaking the Faraday penetration barrier. Another ob-

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Tribo-Aero-Electrostatic Separator for Ternary Mixtures of ...

Abstract: This paper presents a comprehensive study of an electrostatic separation device for the recycling of granular plastic materials from waste electrical and electronic equipment (WEEE). The peculiarity of this system is the association of two charging techniques: (1) fluidized bed (dynamic charger) and (2) sliding on inclined plates (static charger)-and two …

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