Smelting Reduction of Sintered Manganese Ore in Stirred Bath

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Other Title
  • 強攪拌浴におけるマンガン焼結鉱の溶融還元反応
  • 強撹拌浴におけるマンガン焼結鉱の溶融還元反応
  • キョウカクハンヨク ニ オケル マンガン ショウケツコウ ノ ヨウユウ カンゲ

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Abstract

Reduction of sintered manganese ore in stirred bath was investigated with a 70 kg scale induction furnace and with a 600 kg scale top and bottom blowing converter.<BR>(1) The change of total manganese content in slag, (T. Mn) is expressed by a first order rate equation. The rate constant, k1 and final manganese content in slag, ( T. Mn) f are affected by CaO/SiO2 ratio, temperature, manganese content in metal, the amount of coke and the condition of bottom blowing. k1 and (T. Mn) are almost constant with [Mn] over 25%. In such a condition, it is shown by X-ray transmission method that reduction site is limited to the coke-slag boundary.<BR>(2) Bottom blown oxygen gas accelerates the reoxidation of manganese and dust formation in the present case, contrary to the case of chromium smelting reduction.<BR>(3) Top blowing oxygen must be blown softly over thick slag layer in order to keep the metal bath away from oxygen jet.<BR>It is concluded that the smelting reduction with top and bottom blowing converter is applicable to the production of ferromanganese.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 74 (5), 801-808, 1988

    The Iron and Steel Institute of Japan

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