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Electrical Separation
Published in S. Komar Kawatra, Advanced Coal Preparation and Beyond, 2020
The rotating-drum electrostatic separator has been widely used to separate a wide range of particle mixtures, including metal from glass, plastics from paper, heavy minerals from beach sands, etc. There has been relatively little scientific work with this technique since the publication of Ralston’s book in 1961, and there would seem to be scope for research to improve the effectiveness of the process. One suggestion for extending the range of particle conductivities that can be separated is to superimpose a radio-frequency electric field onto the direct field, so that the effective conductivity of particles will include dielectric loss, allowing some insulators to be separated based on their dielectric constants (Horowitz, 1966; Szczerbinski, 1983).
Electrical separation
Published in D.V. Subba Rao, Mineral Beneficiation, 2011
In charging by contacting dissimilar particles, particles placed on surface are made to repeatedly contact one another as well as the surface; the surface will acquire electrons from one type of particles and give electrons to another type so that two types of particles are charged with opposite charges. When they are passed through an electrostatic separator consisting of two conducting plates across which a high voltage is applied, positively charged particles are attracted towards a negative plate and negatively charged particles are attracted towards a positive plate. This mechanism is utilized in free fall electrostatic separators. However, this is not the major mechanism in any of the electrostatic separators.
Experimental investigation of a modified free-fall tribo-electrostatic separator with rotating electrodes
Published in Particulate Science and Technology, 2022
Imad Eddine Kimi, Mohamed Miloudi, Seddik Touhami, Djamel-Eddine Fekir, Amar Tilmatine
The development of new separation devices is still required since the recycling industry is always growing. Sorting of particles using electrostatic forces is one of the most important applications of electrostatics that is considered as a promising technology for recycling industry such as electric wire and printed-board wastes. Three separation techniques are often used for processing three different types of granular mixtures: (i) role-type electrostatic separator, used for metal/plastic particles (copper/PVC for example); (ii) plate-type electrostatic separator, used for metal/metal particles (copper/aluminum for example) and (iii) tribo-electrostatic separators, used for plastic/plastic particles (PVC/PE for example). The present work is dedicated to the latter category of separators for sorting plastic granular mixtures.