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Magnetic Roasting and Leaching for Upgrading Minnesota Manganiferous Iron Ores.
NTIS: PB 193 329 :13 pages
A process for recovering both iron and manganese from four manganiferous ores of the cuyuna range was evaluated. It comprised (1) low-temperature gaseous reduction to convert nonmagnetic iron minerals to magnetite and manganic minerals to manganeous oxide, (2) acid leaching to extract manganese, and (3) magnetic separation to reclaim iron from the leach residue. Iron recoveries from the magnetic products ranged from 70 percent up to 90 percent; manganese recoveries from leach filtrates ranged from 75 percent to 95 percent. Two ores, from the hillcrest and south alstead properties, yielded magnetic products considered adequate for use as blast furnace feed. Although good yields of manganese were attained on all ores, appreciable iron accompanied the manganese into solution. Prevous work, however, has shown that this iron can be precipitated almost quantitatively under autoclave oxygen pressure with very little loss of manganese.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 193 329
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division