Table of Contents
Magnetic Separation News
Volume 1 (1984), Issue 3, Pages 115-122

Magnetizing Roast for Chalcopyrite: Effect of Particle Size and Dilution

Department of Mining and Metallurgical Engineering, McGill University, Montreal H3A 2A7, Canada

Accepted 1 March 1984

Copyright © 1984 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.


In excess oxvgen, 0-37 μm CuFeS2 became magnetic at a temperature of 280ºc. The magnetic product is copper ferrite, CuO.Fe203. The ‘magnetizing’ temperature increased with particle size apparently following the trend reported for the ignition temperature. Dilution increased the magnetizing temperature; 80% dilution by PbS, MoS2 or SiO2 increases the temperature from 280ºC to over 420ºC. Sinterina was a concurrent reaction. Nevertheless, a chalcopyrite/ galena mixture after roasting and gentle grinding was readily separated on a Davis tube.