Electromagnetic Separation of Copper Iron Sulphides
At Fredricktown, Missouri, the North American Lead Co. is operating four Dings separators on copper, iron, and nickel sulphides. The ore is roasted in a McDougal furnace. The roasted chalcopyrite is removed by the first magnet of the separator, and this product is smelted directly to black copper. ... There are three magneticseparation plants ...