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Sulfatization-reduction of manganiferous iron ore.

Authors
Joyce-FE Jr.; Prasky-C
Source
NTIS: PB 221 912 :1-17
Link
NIOSHTIC No.
10009003
Abstract
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.
Publication Date
19730101
Document Type
IH; Report of Investigations
Fiscal Year
1973
NTIS Accession No.
PB-221912
NTIS Price
A03
Identifying No.
RI-7749
NIOSH Division
TCRC
Source Name
NTIS: PB 221 912
State
MN
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