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Beneficiation of Western Mesabi Range Oxidized Taconite.
Colombo-AF; Jacobs-HD; Hopstock-DM
NTIS: PB 289 784 :13 pages
In an effort to maintain an adequate supply of iron to meet national economic and strategic needs, the Bureau of Mines, U.S. Department of the Interior, is conducting research on methods for beneficiating the oxidized taconite resources located on the Western Mesabi Range in Minnesota, thus expanding domestic iron ore reserves. The selective flocculation and cationic flotation process was investigated in a pilot plant using an ore feed rate of 410 kg/hr (900 lb/hr) and 88 pct recycled water. Lime and a cationic flocculant were used to clarify the waste slurries treated in the water reclamation circuit. An oxidized taconite assaying approximately 36 pct fe yielded concentrates averaging 63.5 pct fe and 4.3 pct sio2 and having an average iron recovery of 84.4 pct. The estimated reagent cost per metric ton of concentrate was approximately $1.10. In an attempt to recover more of the iron lost in the flotation tailing wet high-intensity magnetic (whim) separation was incorporated in the pilot plant circuit. The flotation concentrate grades obtained from beneficiation circuits with and without whim scavenging were similar, but when whim separation was used the overall iron recovery was increased by 2 to 9.5 pct, depending on the iron assay of the flotation tailing.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 289 784
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division