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Mass- and Heat Transfer During Dissolution of Alumina

机译：氧化铝溶解期间的质量和传热

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Dissolution of alumina in industrial aluminium cells is a complicated process, not least because it involves formation of agglomerates, and it involves mass- and heat transfer phenomena taking place simultaneously. In the present study, the diffusion coefficient of alumina in cryolitic melts was measured using a rotating alumina disc. It was found that the temperature dependence of the diffusion coefficient is relatively large. The enthalpies for heating of alumina, conversion, and dissolution are summarised. The addition of 1 wt% alumina causes adiabatic cooling of typically 10-12 °C in a normal industrial bath. The dissolution can be regarded as being purely mass transfer controlled, since the heat required for dissolution only brings about 1 °C temperature drop from the bath bulk to the alumina surface. The bath at the alumina surface is saturated in alumina and has a lower liquidus temperature than the bulk. Alumina dissolution can, therefore, take place in a supercooled bath.
机译：氧化铝在工业铝制细胞中的溶解是一种复杂的过程，尤其是因为它涉及形成附聚物，并且它涉及同时进行的质量和传热现象。在本研究中，使用旋转氧化铝盘测量氧化铝中氧化铝的扩散系数。发现扩散系数的温度依赖性相对较大。总结了加热氧化铝，转化和溶解的焓。加入1wt％氧化铝在正常的工业浴中导致通常10-12℃的绝热冷却。可以将溶解视为纯度传质，因为溶解所需的热量仅使从浴体积到氧化铝表面产生约1℃的温度下降。氧化铝表面的浴在氧化铝中饱和，液体温度低于块状。因此，氧化铝溶解可以在过冷浴中进行。

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