| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Electrochemistry V
|
| Presentation Title |
Cyclic Voltammetry for Real-time Oxide Ion Concentration Measurements of a Molten CaCl2 |
| Author(s) |
Forest Mitchell Felling, Olivia Dale, Mario Gonzalez, Michael Simpson |
| On-Site Speaker (Planned) |
Forest Mitchell Felling |
| Abstract Scope |
Salt-soluble CaO is generated during direct oxide reduction (DOR) of metal oxides with Ca dissolved in CaCl2. Real-time measurement of the CaO concentration could be used to track the DOR process’s progress. It was previously reported that a cyclic voltammetry (CV) oxidation peak using a tungsten working electrode had been correlated with CaO up to 4.0 wt.% CaO. More recently, a sintered CaO pellet was slowly dissolved in CaCl2 up to 12 wt% to emulate the slow increase in CaO concentration during DOR. At CaO concentrations above 5.6 wt%, the oxidation peak could not be resolved. Instead of determining peak height, the CV current was integrated over the range of potentials at which the oxidation reaction occurred. Below about 7 wt%, a good correlation was found between CaO concentration and the integrated oxidation current. Above this concentration, the integrated current decreases with increasing time. This behavior is not currently understood. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Pyrometallurgy, Extraction and Processing |