Modelling Of Tribo-electrostatic Separation
For Industrial By-products Recycling
Author(s)
F. Cangialosi, F. Crapulli, G. Intini, L. Liberti & M. Notarnicola
Abstract
Tribo-electrostatic separation is a dry technology which allows the elimination of
impurities from industrial wastes on the basis of their surface charging
characteristics. In this paper results of investigations aiming to numerically
simulate the tribo-electrostatic separation of fine particles for industrial
by-products recycling are described. After charging in a pneumatic transport line,
the mixture of the particles to be separated is injected in a separation chamber
where a DC electric field is created using two parallel plate electrodes. The
particle/gas flow inside the chamber was simulated using an extended
commercial computational fluid dynamics (CFD) code. The three-dimensional
turbulent flow was calculated. Based on the Lagrangian approach, the trajectories
of the powder particles (<100 microns) were modelled considering electric and
aerodynamic forces. Comparison of the simulation results with experiments
carried out with a bench-scale separation unit are presented for the case of silica
beads, whose electric characteristics resemble those of coal fly ashes. The effects
of particle charge, electric field and injection velocity were investigated,
revealing that a proper choice of separator geometry and flow parameters allows
unwanted fine particles in industrial wastes like fly ash to be efficiently removed.
Keywords: powder wastes, tribo-electrostatic separation, computational fluid
dynamics (CFD).
1 Introduction
For the sustainable development of our society, recycling of municipal and
industrial wastes must continue to be pursued. Many industrial wastes
(combustion fly ashes, residues of surface finishing process in soft metallurgy,
commingled plastic waste from electric/electronic equipments, etc.) are in
Keywords
powder wastes, tribo-electrostatic separation, computational fluid
dynamics (CFD).
Related Book
Other papers in this volume
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