CaO-SiO<SUB>2</SUB>-Cr<SUB>2</SUB>O<SUB>3</SUB>系スラグの固体炭素による還元

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タイトル別名
  • Reduction of Cr<SUB>2</SUB>O<SUB>3</SUB> in CaO-SiO<SUB>2</SUB> Slags by Solid Carbon
  • CaO-SiO2-Cr2O3系スラグの固体炭素による還元
  • CaO SiO2 Cr2O3ケイ スラグ ノ コタイ タンソ ニ ヨル カンゲ

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The rates and mechanism of the reduction of chromium oxide slags by solid carbon have been investigated at temperatures between 1773 and 1973 K in the concentrations of Cr2O3 ranging from 10 to 50% with the slag basicity CaO/SiO2 taking values from 0.5 to 1.4. The rate of reduction has been determined from the mass loss measured by means of thermogravimetry under argon atmosphere.<BR>The acceleration of the reduction of Cr2O3 at an early stage is caused by an increase in the contact area of the slag with the graphite. In some reduction curves of acid slags, a long incubation period is observed. In the range of reduction from 30 to 70%, the rate of reduction is essentially indepedent of the concentration of Cr2O3. The slag wets well the graphite and hence the reduction proceeds rapidly in the region of two-liquid-phase in the CaO-SiO2-Cr2O3 system. The changes in wetting of the graphite surface by the molten slag complicate the temperature dependence of the reduction rate.

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  • 日本金属学会誌

    日本金属学会誌 51 (5), 439-445, 1987

    公益社団法人 日本金属学会

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