| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recycling and Sustainability in Cast Shop Technology: Joint Session with REWAS 2025
|
| Presentation Title |
Electrolytic purification of aluminum scrap in NaCl-KCl-Na3AlF6 molten salt system |
| Author(s) |
Buju Guo, Yaowu Wang, Wenxiong Dong, Jinbo Qiao |
| On-Site Speaker (Planned) |
Buju Guo |
| Abstract Scope |
Recovery of aluminum scrap has attracted wide attention due to its low energy consumption and carbon emission. The current aluminum scrap recycling by remelting process cannot remove alloying elements and impurities in recovery process, such that the recycled aluminum satisfies only the requirements of downgraded use. In order to achieve the purpose of upcycling aluminum scrap, in this study, typical aluminum scrap was used as soluble anode to purify in NaCl-KCl-Na3AlF6 molten salt system at 710 ℃. The liquidus temperature and electrical conductivity of the eutectic NaCl-KCl molten salt with different molar concentrations of Na3AlF6 added were determined. The whole electrolytic purification process including the dissolution of anode and the precipitation of cathode was analyzed. The results show that the liquidus temperature decreases and then rises with the increase of Na3AlF6concentration, while the trend of electrical conductivity is opposite. Most alloying elements in aluminum scrap can be removed by electrolytic purification with soluble anode, and the purity of aluminum obtained on the cathode can reach over 99.8 wt. % under the conditions of electrolysis temperature of 710 °C, cathode current density of 0.5 A/cm2, electrolysis duration of 5 h and Na3AlF6 concentration of 8 mol %. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Recycling and Secondary Recovery, Electrometallurgy |