Process for Scavenging Iron from Tailings Produced by Flotation Beneficiation and for Increasing Iron Ore Recovery.
U S Pat 4 192 738 1980 Mar; :
The tailings produced by iron ore flotation are treated by the wet high-intensity magnetic separation for iron scavenging. The magnetic separator is operated with air-gap field strength of 2-100, and preferably 5-10 kg. Magnetic concentrate from scavenging is reprocessed by flotation to improve iron recovery. Thus, tailings from the cationic gangue flotation containing 36.2 pct fe were fed into the high gradient carousel-type magnetic separator having a 6- kg air-gap field oriented parallel to slurry flow. The resulting magnetic concentrate contained 9.0 pct fe compared with 19.2 In the tailings. The concentrate was thickened and fed into a cationic gangue flotation cell for upgrading. The iron recovered in final concentrate was 81.5 pct, at 63.5 pct content; conventional concentrate produced without magnetic scavenging showed 72 pct recovery and 63.5 pct fe content.
U.S. Pat. 4,192,738, Mar. 11, 1980; Chem. Abstr. 91:P126,641g