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Alumina Concentration Measurements in Cryolite Melts

机译：卤素浓度测量在冰冻熔体中

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The alumina dissolution is one of the most important processes for advanced aluminium electrolysis. For a better understanding and improvements on the dissolution process, it is important to find an effective and reliable method to perform in situ measurements in the cryolite melt, obtaining in this way the variation in alumina concentration during the entire electrolysis process. Electromotive force (emf) measurements between an electrochemical alumina sensor made of graphite and two reference electrodes (a graphite quasi-reference electrode and an aluminium reference electrode), were performed during the addition of alumina and throughout the entire process of dissolution. Cell reactions between the alumina sensor and the two reference electrodes were derived, and the theoretical cell voltages were calculated. The cell voltage measurements were analyzed and compared with the theoretical calculations to determine the reliability of the electrochemical sensor and verify the validity of the basis and assumptions used in this work for the determination of alumina concentration.
机译：氧化铝溶解是先进铝电解的最重要的方法之一。为了更好地理解和改进溶解过程，重要的是找到一种有效且可靠的方法来在冰晶石熔体中进行原位测量，以这种方式获得整个电解过程中的氧化铝浓度的变化。在添加氧化铝和整个溶解过程中，在添加氧化铝和两个参考电极（石墨准参考电极和铝基参考电极）之间进行电化学氧化铝传感器之间的电动力（EMF）测量。氧化铝传感器和两个参考电极之间的细胞反应被推导出来，计算理论电池电压。分析电池电压测量并与理论计算进行比较，以确定电化学传感器的可靠性，并验证该工作中使用的基础和假设的有效性，以确定氧化铝浓度。

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