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Metallization of Pelletized, Domestic Iron Oxide Superconcentrates With Lignite and Coal in a Rotary Kiln.

Authors
Peterson-RE; Prasky-C
Source
NTIS: PB 261 336 :18 pages
Link
NIOSHTIC No.
10007809
Abstract
The Bureau of Mines conducted an investigation to produce metallized pellets from domestic iron ore superconcentrates using lignite and subbituminous coal as reductants. Feed materials for the metallizing process consisted of commercially indurated iron oxide pellets and green pellets prepared from upgraded domestic concentrates with graphite or limestone as internal additives. Durability of the green pellets during metallization was investigated in tests conducted in a 7-inch-id rotating drum furnace. Test results indicated that the major cause of pellet disintegration with the concentrates used was the tumbling action during reduction rather than forces generated within the pellets. In larger scale tests made in a 34-inch-id by 35-foot-long kiln, the previously indurated pellets were metallized with lignite at 1,030 deg c with little disintegration. A 96-percent level of metallization was obtained in pellets having an average compressive strength of 420 lb. In subsequent, similar tests using green pellets containing graphite or limestone, pellet disintegration was more severe, with 10 to 40 percent of the feed being lost as dust. The surviving pellets had metallizations ranging from 88.3 to 94.4 percent and compressive strengths ranging from 60 to 68 lb.
Publication Date
19760101
Document Type
IH; Report of Investigation;
Fiscal Year
1976
NTIS Accession No.
PB-261336
NTIS Price
A03
Identifying No.
RI 8179
NIOSH Division
TCRC;
Source Name
NTIS: PB 261 336
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