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Continuous Gaseous Direct Reduction of Low-grade Iron Ore in a Fluid- bed Reactor.
Davis-EG; Crabtree-JO; Feld-IL
NTIS: PB 209 012 :19 pages
The gaseous direct reduction of low-grade iron ore concentrates in a continuous fluid-bed reactor was investigated. These studies were made in a 4-inch-diameter fluid-bed reactor using hydrogen alone, and oxygen- or air-reformed natural gas as the reductants. The percent reduction was directly dependent on the mole ratio of hydrogen in the reducing gas to the oxygen associated with the iron oxide in the ore. Two- and three-stage fluid-bed tests were simulated by repeated continuous tests. The results showed that percent reduction of the final product was dependent on the mole ratio of the quantity of hydrogen in the gas of each stage to oxygen in the iron oxide of the initial ore feed. Reduction as high as 87 percent in the single stages and as high as 94 percent in the multistages was obtained when either hydrogen or reformed natural gas was used as the reducing gas.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 209 012
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division