Corrosion of Fused Silica Refractories by Molten CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> Slag

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  • 溶融石英質耐火物のCaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>系スラグによる侵食
  • ヨウユウ セキエイシツ タイカブツ ノ CaO Al2O3 SiO2ケイ スラ

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Abstract

The corrosion of fused silica refractories in molten CaO-Al2O3-SiO2 slag was studied. The experiment was carried out with a rotating cylindrical specimen. The retults are as follows:<br>(1) The diameter of specimens decreased linearly with time. The increase both in temperature and rotating speed promoted the corrosion.<br>(2) A thin reaction layer was observed on the surface of the specimen. The change in SiO2 concentration in the slag was best described by a rate equation (which was derived) for the mass transport controlled mechanism. The apparent activation energy of corrosion was 64kcal/mol, implying that the corrosion is controlled by diffusion of ion in the slag.<br>(3) A non-dimensional equation κ=αU0.67 was obtained, the exponent of which agreed with the literature values.

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