Abstract
In this study, three slots containing an anode chamber, a cathode chamber, and a middle pole chamber were designed by applying the Hittorf method, and a two-way coupling model of the flow field and electric field was established using the COMSOL system. The electric field distribution in the constructed model was simulated, and the model reliability, boundary conditions, and related parameters were verified. A three-chamber tank was utilized to investigate the migration numbers change rule and migration mechanism of Y(III) ions in the AlF3–(Li,Na)F system. The migration number of Y(III) ions in the AlF3–(Li,Na)F–Y2O3 molten salt linearly increased from 0.70 to 0.80 with an increase in temperature from 900 to 1000 °C. When the (Li,Na)F/AlF3 molar ratio was between 2.0 and 2.5, the migration number of Y(III) ions was relatively constant, and its average value was approximately 0.75. Meanwhile, at (Li,Na)F/AlF3 molar ratios higher than 2.5, the migration number of Y(III) ions linearly decreased from 0.75 to 0.45. Finally, in the current density range of 1.0–2.0 A/cm2, the migration number of Y(III) ions increased almost linearly from 0.65 to 0.85.
Highlights
Owing to significant progress made in the field of rare earth metals and alloys prepared by molten salt electrolysis in China, this technology has been successfully applied for the production of rare earth aluminum alloys [1,2,3]
NaF–LiF molten salt is important for controlling the Y content during the Al–Cu–Y alloy electrolysis process [9,10]
Three slots consisting of an anode chamber, a cathode chamber, and a middle pole chamber were designed by applying the Hittorf method to measure the variation in the migration number of anions and cations
Summary
Owing to significant progress made in the field of rare earth metals and alloys prepared by molten salt electrolysis in China, this technology has been successfully applied for the production of rare earth aluminum alloys [1,2,3]. The authors of this article prepared an Al–Cu–Y alloy on a consumable copper cathode in the AlF3 –(Li,Na)F fluoride salt system using Al2 O3 and Y2 O3 as the raw materials [7]. To further study the migration and transformation of rare earth Y2 O3 species, it is necessary to examine the electrical transport properties of Y(III) ions in the. Studying the variation of the migration number of Y(III) ions in the AlF3 –. NaF–LiF molten salt is important for controlling the Y content during the Al–Cu–Y alloy electrolysis process [9,10]. Three slots consisting of an anode chamber, a cathode chamber, and a middle pole chamber were designed by applying the Hittorf method to measure the variation in the migration number of anions and cations. Y(III) ions in the AlF3–(Li,Na)F system was elucidated
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