Table of Contents
Magnetic and Electrical Separation
Volume 5, Issue 1, Pages 33-52

Carrier Coagulation of Chromite Fines in Wet Magnetic Separation

1Division of Mineral Processing, Luleå University of Technology, Luleå, Sweden
2Institute for Surface Chemistry, Stockholm, Sweden

Received 13 April 1993

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.


A "carrier" or "piggy–back" coagulation process was applied to improve the separation efficiency of chromite slimes in wet high–gradient magnetic separation. This was achieved by the addition of a coarse chromite fraction to the slime fraction (< 10 mm). Three coarse chromite fractions were investigated in the present study with size ranges <106>75, <75>53 and <53>38 μm. The results suggested that the <53>38 μm coarse fraction was the most effective in improving the process efficiency. Superior performance was also found to occur between pH 5 and 6. The results were discussed by computing the various components for potential energy of interaction between the slime particles and the "carrier" or "piggy-back" particles at a range of surface potentials in the absence or presence of the magnetic field.