Table of Contents
Magnetic and Electrical Separation
Volume 6, Issue 2, Pages 87-97

Microwave Pretreatment of Coal Prior to Magnetic Separation

School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

Received 22 August 1994; Revised 12 January 1995

Copyright © 1995 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.


New methods to reduce the total sulphur content of coals are being developed since the introduction of legislation requiring cuts in sulphur emissions to the atmosphere. It is known that weakly paramagnetic pyrite (FeS2) particles are difficult to remove from clean coal by standard magnetic separation techniques. Data is presented here comparing standard magnetic separation tests to results achieved when the coal is subjected to a caustic microwave leach pretreatment, prior to conventional dry magnetic separation. A significant increase in the removal of total sulphur is observed when this pretreatment is applied to the coal.