Table of Contents
Magnetic and Electrical Separation
Volume 4, Issue 2, Pages 75-90

A New Type of Corona Electrode for High - Tension Separators

Technical University of Cluj-Napoca, 15 C. Daicoviciu Street, Cluj-Napoca 3400, Romania

Received 25 May 1992

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The corona discharge represents the main physical mechanism involved in the charging of granular materials in high-tension separators. This is why an attempt has been made to formulate several criteria for choosing the most adequate electrode. A crude evaluation of the required corona current for an efficient charging has been considered as a necessary starting point for a wellgrounded decision on the type of electrode to be employed with a certain application. The specific features of several models of corona electrodes are briefly discussed, in order to justify the need for a new design. The original corona electrode proposed by the authors is characterized by lower corona on-set voltage, better stability of the corona discharge during long-time operation, and shorter maintenance time, as compared to "classical" solutions. Systematic experiments made on a laboratory model of this electrode enable several design considerations that could be easily extended to other similar devices. Two industrial high-tension separators are already provided with the new type of electrode.