Table of Contents
Magnetic and Electrical Separation
Volume 11, Issue 1-2, Pages 9-32
http://dx.doi.org/10.1155/2002/46414

Triboelectric Charge, Electrophysical Properties and Electrical Beneficiation Potential of Chemically Treated Feldspar, Quartz and Wollastonite

1Division of Mineral Processing, Luleå University of Technology, Luleå SE-971 87, Sweden
2Docentvagen 26, Luleå SE-977 52, Sweden

Received 11 December 2000; Accepted 26 January 2001

Copyright © 2002 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.

Abstract

The triboelectric charge attributes of the pure feldspar, quartz and wollastonite mineral samples, after contact with plate and cyclone type tribochargers made up of different materials were investigated. The main electrical properties of the minerals, i.e., electrical conductivity and dielectric constant, were measured and their energetic work functions were estimated. In addition, the behaviour of mineral samples in the electric field of a free-fall separator before and after chemical treatment with different organic reagents was deduced.

The results reveal that the cyclone tribochargers are more effective in imparting charges on mineral grains. The reproducible charges with higher magnitudes are created when cyclones are used for imparting charges on mineral grains. Furthermore, in spite of having relatively similar energetic structures for the three minerals, the Teflon tribocharger demonstrates the feasibility of quartz separation from wollastonite and feldspar. The salicylic acid conditioning promotes feldspar-wollastonite separation.