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Control Mechanism for Alumina Dissolution in Cryolite Melts

Ž. Lubyová and V. Daněk

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava


Abstract: The process determining the alumina dissolution rate in cryolite-based melts containing increased amount of AlF3 and CaF2, KF and LiF as additives, was studied. The influence of KF on the equilibrium solubility of Al2O3 in these melts was investigated.It was found that the dissolution rate of alumina in the cryolite-based melts may be limited by diffusion or heat transfer. Which of these processes becomes the control one is determined by the specific surface and the starting mass of Al2O3, its solubility in the given melt, and the convection of electrolyte.

Full paper in Portable Document Format: 492a59.pdf


Chemical Papers 49 (2) 59–63 (1995)

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