US840802A - Electrostatic separator. - Google Patents

Optimisation of belt-type electrostatic separation of granular plastic mixtures tribocharged in a propeller-type device M Miloudi, K Medles, A Tilmatine et al.-Physical model of granule adhesion to the belt-electrodes of a tribo-aero-electrostatic separator Jia Li, Lucian Dascalescu, Mohamed Miloudi et al.-Computational strategies for 3D

Minerals Ealgl~ering, THE THEORY OF ELECTROSTATIC ...

Jun 01, 2005· 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.

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

Apr 30, 2017· 1. Introduction. Accumulation of electrostatic charge is frequently observed during powder processing and handling. Operations such as mixing, milling, and conveying involve the movement of the powder against surfaces and therefore can lead to charging via friction, commonly known as tribocharging. 1−3 The industrial significance and the importance of the phenomenon itself …

Factors that influence the efficiency of a fluidized-bed ...

Free-fall electrostatic separator experimental set-up: 1 – thermohygrometer probe, 2 – thermohygrometer, 3 – fluidized bed tribocharging device, 4 – fluidizing air heater, 5 – pressure gauge, 6 – high voltage supply, 7 – variable angle feeding device, 8 – plate electrodes, 9 – material fractions collector with seven compartments.

Tribocharging of plastics granulates in a fluidized bed device

separation of HIPS, ABS-PC, and ABS originated from IT 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 were obtained for the

(PDF) New Propeller-Type Tribocharging Device With ...

Electrostatic separation is used in many heavy mineral sand operations for the separation of minerals, particularly where other separation means (density, size, magnetic ... Tribocharging devices using appropriate surface materials ahead of the separator could also be used to enhance these effects.

Tribocharging and electrostatic separation of mixed ...

Universal type Electrostatic Separator. Electrostatic separation depends on a number of electrical and mechanical properties such as conductance, contact potential, dielectric constant, end particle shape. In routine testing it is desirable that the application of each of these properties be investigated.

Moore, Electrostatics: Exploring, Controlling, and Using ...

The output of any electrostatic separation process is strongly dependent on the effectiveness of particle charging. A novel laboratory-scale fluidized-bed tribocharging device has been described in a previous paper. The aim of this paper is to assess the effectiveness of two materials, aluminum and polypropylene (PP), that could be employed in the tribocharging chamber of that device.

Electrostatic Separator - 911Metallurgist

An ionic electret is a material that has a net electrostatic charge due to a difference in the number of cationic and anionic charges in the material. Any material that has ions at its surface, or accessible in its interior, has the potential to become an ionic electret.

Paper 1.24- Dascalescu-revised

electrostatic field E generated by two plate electrodes (Figure 8). The design of the triboelectrostatic separator TESS, developed by the High-Intensity Electric Fields Laboratory, was established having in mind the criteria of competitiveness, functionality, and versatility (different tribocharging devices …

Roll-type versus Free-fall Electrostatic Separation of ...

electrostatic separator. The granular materials to be separated, a mixture of 50% low-density polyethylene (LDPE) and 50% high-density polyethylene (HDPE) were charged by particle-to-particle and particle-to-wall collisions taking place inside the rotating tube of a custom-designed tribocharging device. The study was

Experimental Comparative Study of Different Tribocharging ...

Granular materials, when fluidized by air or other gaseous medium, acquire electrostatic charge by inter-particle and particle-wall collisions. The effectiveness of particle tribocharging achieved with such fluidization process is crucial for establishing the feasibility of electrostatic separation of mixed granular solid wastes in the recycling industry.

US840802A - Electrostatic separator. - Google Patents

tribocharging) is then discussed. I. INTRODUCTION In any separator, the separation is brought about by suspending the particles in a medium and subjecting them to a separating force that acts on some particle property. In the case of electrostatic separations, the primary separating force is given by

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

Tribo-electrostatic separation is the solution of choice for the selective sorting of various plastics contained in a granular mixture. This work is aimed at validating the efficiency of a modified compressed-air-operated tribo-charging device for the electrostatic separation of mixed granular plastics originating from industrial waste.

ELECTROSTATIC SEPARATION – eFACTOR3

An ionic electret is a material that has a net electrostatic charge due to a difference in the number of cationic and anionic charges in the material. Any material that has ions at its surface, or accessible in its interior, has the potential to become an ionic electret.

Tribocharging Device For Electrostatic Separator

Hamos EKS electrostatic separators make use of the differences in tribo-electric behavior of individual plastics. The plastic mixture is fed via a vibrating conveyor into a tribo-electric charging unit. Different plastics are charged here according to the specific properties of the material, taking on either a positive or negative charge.

Electrostatic Separation of Lunar Regolith for Size ...

B. Rotating cylinder tribocharging device A rotating cylinder tribocharging device was used to process either DBD-treated or un-treated particles (Fig. 3). Particles were introduced in a feeder (1). A valve (2) was used to regulate particle flow rate going through the hollow cylinder (3), having an inner di-ameter: 120 mm), which charged them.

Powder Fluidization / Triboelectricity, Powder Electric Charge

Oct 10, 2011· Tribocharging and electrostatic separation of mixed granular solids in fluidized bed devices Abstract: Granular materials, when fluidized by air or other gaseous medium, acquire electrostatic charge by inter-particle and particle-wall collisions. The effectiveness of particle tribocharging achieved with such fluidization process is crucial for ...

Electrostatic technologies for materials recovery in high ...

electrostatic field E generated by two plate electrodes (Figure 8). The design of the triboelectrostatic separator TESS, developed by the High-Intensity Electric Fields Laboratory, was established having in mind the criteria of competitiveness, functionality, and versatility (different tribocharging devices …


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