CaO-Al<SUB>2</SUB>O<SUB>3</SUB> 2元系スラグへの炭素溶解速度について

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  • ハワイ大学自然エネルギー研究所'84風力エネルギー・ワークショップに参加して
  • Dissolution Rates of Carbon in Molten CaO-Al<SUB>2</SUB>O<SUB>3</SUB> Binary Slag
  • CaO Al2O3 2ゲンケイ スラグ エ ノ タンソ ヨウカイ ソクド ニ

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A study was made on the dissolution rates of carbon in CaO-Al2O3 binary slag melted in a graphite or alumina crucible with carbon saturated iron.<BR>In the case of pure carbon saturated iron, the dissolution of carbon in slag occurs mainly from graphite, while, in the case of silicon or aluminium addition to metal, it proceeds from the metal at the early stages of the reaction and then proceeds from the graphite.<BR>The dissolution rate of carbon from graphite was expressed by a zeroth order reaction and its apparent activation energy was 587 kJ/mol for 50 wt.%CaO-50 wt.%Al2O3 slag. The rate increased in proportion to the 3/2th power of the activity of lime and to the ratio of slag-metal to slag-graphite interfacial area. Carbon dissolution from graphite was promoted by the addition of silicon and aluminium to metal, but it was reduced by the increase of PCO in the gaseous phase. This implies that the carbon dissolution proceeds electrochemically and its rate is controlled by a chemical reaction. On the other hand, the dissolution rate of carbon from metal is represented by a first order reaction and is controlled by the transport of carbon through the slag boundary layer.

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