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Roasting Nonmagnetic Taconites in a Fluid Bed Using Low-rank Fuels as Reductants.

Authors
Pahlman-JE; Ruzzi-PL; Schluter-RB
Source
NTIS: PB 255 546 :15 pages
Link
NIOSHTIC No.
10007774
Abstract
The Bureau of Mines performed research on a fluid-bed magnetic roasting process for nonmagnetic taconites that utilizes low-rank coals and lignites as reductants and fuels. Roasting tests on a Michigan nonmagnetic taconite were conducted at 600 deg to 725 deg c with lignite or subbituminous coal as reductants. Partial combustion of the reductant reduced the amount of heat externally applied to the reactor to maintain the desired reactor temperature. Cleaned, dried reactor top gases were recycled to recover a portion of the reducing potential in these gases without adversely affecting concentrate grade and iron recovery. Highest iron recoveries for magnetic concentrates were obtained at a roast temperature of 650 deg c with lignite and at a roast temperature of 725 deg c with subbituminous coal. Magnetic concentrates were obtained that were comparable with commercial concentrates.
Publication Date
19760101
Document Type
IH; Report of Investigation;
Fiscal Year
1976
NTIS Accession No.
PB-255546
NTIS Price
A03
Identifying No.
RI 8149
NIOSH Division
TCRC;
Source Name
NTIS: PB 255 546
State
MI;
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