Anodic process on Cu?Al alloy in KF?AlF3?Al2O3 melts and suspensions |
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| Affiliation: | 1. Institut Carnot Chimie Balard Cirimat, UMR CNRS 5085, Université de Toulouse, UPS-CNRS, France;2. Laboratoire de Génie Chimique, Université de Toulouse, UPS-CNRS, Toulouse, France;1. INRS- Énergie, Matériaux, Télécommunications, 1650 Bd. Lionel Boulet, Varennes, Québec, J3X 1S2, Canada;2. Concordia Univ, Dept Mechanical, Industrial & Aerospace Engineering, 1455 Maisonneuve Blvd W, Montreal, Québec, H3G 1M8, Canada;3. Kingston Process Metallurgy Inc., 759 Progress Avenue, Kingston, Ontario, K7M 6N6, Canada;4. Universidad Industrial de Santander, Grupo INTERFASE, Ciudad Universitaria, Calle 9, Carrera 27, Bucaramanga, Santander, Colombia |
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| Abstract: | Anodic processes on Cu?10Al electrode in molten KF?AlF3?Al2O3 (saturated) and suspensions were characterized using chronopotentiometric and cyclic voltammetric techniques. Effects of cryolite ratio (CR= x(KF)/x(AlF3)), temperature and particle volume fraction (?) on the electrochemical behaviour of the anode were demonstrated. Initially, the anode was polarised in the galvanostatic mode in melt and suspensions (?=0.12, 0.15) at 750 °C with 0.4 A/cm2 current density. The anode potential in melt varied between 2.5 and 3.2 V and in suspensions (?= 0.12) between 3.3 and 3.4 V. XRD analysis was conducted to study the oxide phases on the anode surface. Anode limiting current densities and mass transfer coefficients drastically decreased with the increase of ? in the suspension. The results suggest that the Cu?10Al electrode works better in suspensions with CR of 1.4 and particle volume fraction of 0.09 at 800 °C. |
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| Keywords: | aluminium suspension oxidation inert anode cryolite melt low-temperature electrolysis |
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