Table of Contents
Magnetic and Electrical Separation
Volume 7, Issue 4, Pages 227-241

Magnetic Flocculation of Hematite Minerals

1School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
2Department of Chemical Engineering, National University of Science and Technology, P.O. Box 346, Bulawayo, Zimbabwe

Received 2 February 1996; Accepted 19 March 1996

Copyright © 1996 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 magnetic flocculation behaviour of two kinds of iron oxide mineral (hematite—1 and hematite—2) was studied by using a new experimental device, in which a stirred container was set in an applied magnetic field. Magnetic flocculation of both minerals occurred in very low applied magnetic fields. Hematite—1 is a strongly paramagnetic mineral, the flocculation recovery improved with increased magnetic field strength and particle size. For hematite—2 the relationship between the flocculation recovery and magnetic field strength was more complex. It was also found that the method used conventionally to calculate the magnetic interaction between particles is not suitable for strongly paramagnetic minerals, such as hematite—1.