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Prereduced iron ore pellets: preparation, properties, and utilization.

Fine MM; Melcher NB; Bernstein N; Woolf PL; Reuss JL
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, B 651, 1970 Jan; :1-63
A process for simultaneously reducing and indurating iron ore pellets was developed by Bureau of Mines laboratory research and confirmed on a continuous pilot plant basis. Moist iron ore concentrate was balled, mixed with solid reductant, and heated at about 1,100 deg. to 1,150 deg. C. On a small scale, a variety of concentrates and fuels were utilized successfully. The pilot rotary kiln tests were limited to natural magnetite, synthetic magnetite, lignite, and anthracite. In both laboratory and pilot plant, partially reduced pellets with excellent physical properties were regularly produced with average analyses of at least 80 percent total iron and 60 percent or more metallic iron. These and other prereduced pellets were smelted in the Bureau's experimental blast furnace facility, Bruceton, Pennsylvania. With prereduced spheres comprising 85 percent of the burden, the coke rate was approximately half that with standard oxide pellets and production of hot metal was increased by 75 percent. Economic appraisal of the cost of making hot metal indicates that reduced pellets could be more profitable than any other iron raw material in both investment capital and daily cost of operation. (Out of print.)
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Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, B 651
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division