Evolution Rates of SiO from Silicate Melts

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  • 珪酸塩融体からのSiO発生速度について
  • ケイサンエン ユウタイ カラ ノ SiO ハッセイ ソクド ニ ツイテ

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Abstract

The evolution rates of SiO from silicate melted in a graphite crucible as a reductant have been studied by means of thermogravimetry under an atmosphere of argon, particularly at high temperatures, in order to investigate the reaction mechanism of SiO evolution from coke ash and blast-furnace slag.<BR>The main volatile species in silicate melts are SiO and Mg, but the evaporation of Ca and Al2O also can not be neglected at high temperatures. The evolution of SiO from silica is greatly accelerated by the addition of CaO, MgO or Al2O3, but is retarded when the latter oxide is added in excess. The addition of MgO to blast-furnace-type slag significantly retards the generation of SiO. The temperature dependence of the evolution rate of SiO at higher temperatures is larger than that at lower temperatures.<BR>These results may be explained by the fact that the slag composition exerts an influence upon the activity of silica and the fluidity of the slag, and by the assumption that the interfacial area for the reaction is dependent upon the wetting of the slag to the graphite crucible and the foaming of the slag.

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