Abstract
The main reasons for the decrease in current efficiency in obtaining the Al–Si alloys are the same as in case of production of pure aluminum: 1) evaporation of the products of the interaction of aluminum and cryolite and 2) dissolution of aluminum in cryolite and its subsequent oxidation. These processes were studied in this chapter by the methods of thermogravimetry, vapor pressure measurements, mass-spectrometry and direct measurements of metal solubility in the melts. As follows from the results, when obtaining alloys, for example, with 3 mass% Si, the productivity of the electrolyzer should increase by 1.013 times, and with 5 mass%, by 1.034 times. Therefore, the decrease in productivity observed during early industrial tests of the method was caused solely by an increase in the process temperature due to the technology violations.
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Pruttskov, D., Andriiko, A., Kirichenko, A. (2023). Current Yield. In: Electrolytic Production of Al–Si Alloys. Monographs in Electrochemistry. Springer, Cham. https://doi.org/10.1007/978-3-031-29249-1_3
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