Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Effect of preheating upon metallization of iron ore pellets.

Authors
Schluter-RB; Ruzzi-PL
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 7612, 1972 Jan; :1-22
Link
NIOSHTIC No.
10008849
Abstract
Drying and preheating (partial induration) of green, unfired iron ore pellets is a means of reducing the energy required to produce metallized pellets. The Bureau of Mines processed three magnetite and two hematite concentrates through the unit operations of pelletizing, preheating in air, and reduction to metal to determine the effects of preheating upon the properties of the metallized pellets. The pellets were prepared in a 16-inch-diameter laboratory balling drum. Preheating and metallization were carried out in an externally heated 4-inch-id by 4-inch-long stainless steel drum using air for the preheating atmosphere and lignite char as a reductant. The results varied considerably; two of the magnetites spalled when preheated in air at temperatures of 900 deg C and above, and the third magnetite and the hematite flotation concentrate required complete induration at 1,300 deg C to produce satisfactory pellets. The earthy hematite ore yielded excellent pellets at all preheat temperatures.
Keywords
Mining-industry; Mineral-processing; Metals
Publication Date
19720101
Document Type
IH; Report of Investigations
Fiscal Year
1972
NTIS Accession No.
PB-209014
NTIS Price
A03
Identifying No.
RI-7612
NIOSH Division
TCRC
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 7612
State
MN
TOP