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Sulfatization-reduction of manganiferous iron ore.
Joyce-FE Jr.; Prasky-C
NTIS: PB 221 912 :1-17
This paper describes the development of a process for producing manganese and iron pellet concentrates from low-grade manganiferous iron ores of the cuyuna range by a two-stage sulfatization-reduction roast. First, the manganese minerals (7.5 percent manganese) were converted to water-soluble manganese sulfate by roasting in sulfur oxide gases at 700 deg c, then, the hematitic iron minerals (31 percent iron) in the hot sulfatized ore were reduced to magnetite with simulated reformed natural gas in the temperature range of 350 deg to 425 deg c. Batch tests were made in a 3-inch-id by 6-inch- long, gas-heated, stainless steel retort, and continuous countercurrent experiments were performed in a 2-inch-id by 10-foot- long, electrically heated shaft furnace. Manganese sulfate was removed from the roasted product by leaching with water, and over 90 percent of the manganese was recovered in an oxide product (65 percent manganese) obtained by precipitation, drying, and thermal decomposition of the sulfate. An iron oxide concentrate (60 percent iron) with an iron recovery of 75 percent was obtained from the water-insoluble residue by magnetic separation.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 221 912
Page last reviewed: April 12, 2019
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