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In excess oxvgen, 0-37 μm CuFeS 2  became magneticat a temperature of 280ºc. The magnetic product is copperferrite, CuO.Fe 2 03. The ‘magnetizing’ temperature increasedwith particle size apparently following the trend reportedfor the ignition temperature. Dilution increased the magnetizingtemperature; 80% dilution by PbS, MoS 2  or SiO 2  increasesthe temperature from 280ºC to over 420ºC. Sinterinawas a concurrent reaction. Nevertheless, a chalcopyrite/galena mixture after roasting and gentle grinding was readilyseparated on a Davis tube.

Magnetizing Roast for Chalcopyrite: Effect of Particle Size and Dilution