The study of the unipolar charging of insulating particles has been stimulated by the recent development of several important electrostatic techno logics: precipitation of dusts, deposition of powders, separation of granular materials. The aim of the present work is to analyse the discharging conditions of insulating disks in contact with an electrode, after having been charged in a unipolar corona field. The experiments were carried out on a roll-type electrostatic separator that simulated the charging/discharging conditions in an industrial unit. The measured data show that the discharge process is a complex phenomenon, depending of at least the following factors: the conductivities of the respective bodies, the aspect of the contact, and the environmental conditions.
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