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

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タイトル別名
  • Properties of Cold and Hot Pressed Briquets Made of Reduced Ore Powder
  • フンジョウ カンゲンコウ オ モチイタ レイカン オヨビ ネッカン セイケイ

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The rednced ore powder for sample was prepared by reducing Hamersley hematite ore with pressurized hydrogen gas at about 900°C in a pilot plant for fluidized bed reduction. The cold and hot pressed briquets were produced from the meduced ore powder using a die at various temperatures.<BR>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°C to 800°C were investigated.<BR>The following results were obtained.<BR>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%.<BR>2) The maxinum rate of reoxidation of briquets was observed at about 400°C, and the reason for this became evident.<BR>3) Hot pressing at 500°C tO 600°C under lower compacting load than that of cold pressing was effective for obtaining high crushing strength of briquets.<BR>4) The reoxidation rate of briquets was controlled by a parabolic law and decreased with increased density of briquets.<BR>5) Sintering of briquets at temperatures of 800°C to 1100°C for 4hrs was not effective for the increase in density.

収録刊行物

  • 鉄と鋼

    鉄と鋼 65 (10), 1517-1525, 1979

    一般社団法人 日本鉄鋼協会

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