The alumina dissolutionAlumina dissolution is one of the most important processes for advanced aluminiumAluminium 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 aluminaAlumina concentration during the entire electrolysis process. Electromotive force (emf) measurements between an electrochemical aluminaAlumina sensor made of graphite and two reference electrodes (a graphite quasi-reference electrode and an aluminiumAluminium reference electrode), were performed during the addition of aluminaAlumina and throughout the entire process of dissolution. Cell reactions between the aluminaAlumina 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 aluminaAlumina concentration.
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- Alumina Concentration Measurements in Cryolite Melts
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