粉状還元鉱を用いた冷間および熱間成形ブリケットの性状

概要

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The reduced ore powder for sample was prepared by reducing Hamersley hematite ore with pressurized hydrogen gas at about 900℃ in a pilot plant for fluidized bed reduction. The cold and hot pressed briquets were produced from the reduced ore powder using a die at various temperatures. The influences of compacting load at various temperatures on the crushing strength, density, and rate of reoxidation with a mixture of oxygen and nitrogen gas at 250℃ to 800℃ were investigated. The following results were obtained. 1) To obtain the briquets of high crushing strength and high density, it was desirable to use reduced ore powder above the reduction degree of about 90%. 2) The maximum rate of reoxidation of briquets was observed at about 400℃, and the reason for this became evident. 3) Hot pressing at 500℃ to 600℃ under lower compacting load than that of cold pressing was effective for obtaining high crushing strength of briquets. 4) The reoxidation rate of briquets was controlled by a parabolic law and decreased with increased density of briquets. 5) Sintering of briquets at temperatures of 800℃ to 1100℃ for 4hrs was not effective for the increase in density.
社団法人日本鉄鋼協会の論文
1979-09-01