Evolution Rates of Mg and SiO from CaO-SiO<SUB>2</SUB>-MgO Slag Melted in a Graphite Crucible

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  • 黒鉛るつぼ中で溶融したCaO-SiO<SUB>2</SUB>-MgOスラグからのMgおよびSiO発生速度について
  • 黒鉛るつぼ中で溶融したCaO-SiO2-MgOスラグからのMgおよびSiO発生速度について
  • コクエン ルツボナカ デ ヨウユウシタ CaO SiO2 MgO スラグ カラ

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The evolution rates of Mg and SiO from CaO-SiO2-MgO slag melted in a graphite crucible were measured at 1823 to 1923 K by means of a thermo-balance, particularly, in order to investigate the reaction mechanism of Mg evolution.<BR>The mass loss was linear with the reaction time. The stoichiometric calculation indicated that the mass loss was caused by both the following over-all reactions:<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentThe rates at 1873 K were 2.2×10−5∼4.8×10−4 mol/m2·s for Mg evolution and 1.0×10−4∼1.5×10−3 mol/m2·s for SiO evolution.<BR>The rate data for Mg evolution applies to the following equation which is derived on the assumption that the rate is controlled by the dissociation of MgO adsorbed on the slag-graphite interface;<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentwhere k1 and k2 are constants.<BR>As to the evolution of SiO, its rate was in proportion to aSiO<SUB>2</SUB>, and the apparent activation energy varied from 270 to 500 kJ/mol with the slag composition. The rate is mixed-controlled by the break-down of Si-O bonds and the transport of SiO2 in slag.

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