Effect of Marangoni‐induced flow on the rate of refractory dissolution in molten slags

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<jats:p>Dissolution rate of silica rods in iron‐saturated silicate slags containing 15–30% SiO<jats:sub>2</jats:sub> was measured using the rotating cylinder technique at 1300°C, under a controlled atmosphere of deoxidized Ar‐gas. These measurements were aimed at quantifying the magnitude of Marangoni‐induced flow near the slag–refractory region. The Marangoni effect was found to be significant under stagnant conditions, but gradually became dominated by bulk flow when the linear velocity of the flowing melt was increased, and reached values in the range of 0.09–0.16 m/s. This implies that, in highly agitated vessels, the Marangoni effect is unlikely to play a dominant role in refractory wear at the slag line. Also, the silica dissolution rate and mass transfer coefficient were examined, and it was found that with increasing silica content of the slag, the dissolution rate and mass transfer coefficient decreased. Furthermore, the relationship between Marangoni number and Reynolds number was calculated, and boundary flow conditions determined using the experimental critical velocity.</jats:p>

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