|
| Study on the thermodynamic analysis of the electrochemical reduction of SiO2 in molten salt |
|
Received:October 18, 2019
Revised:November 04, 2019
Accepted:November 05, 2019
Published Online:July 16, 2020
|
| View Full Text View/Add Comment Download reader |
| DOI： |
| KeyWord:SiO2, molten-salt;electrolysis, temperature, gaseous;pressure, thermodynamic;calculation |
| Author | Institution |
| ZHOU Zhong-ren |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology;China;National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology |
| ZHANG Ying-jie |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology |
| HUA Yi-xin |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology |
| DONG Peng |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology |
|
| Hits: 1894 |
| Download times: 936 |
| Abstract: |
| During the preparation of metallic silicon by the molten salt electrolysis of SiO2, the electrolytic temperature and the gaseous pressure affect the electrochemical reduction of SiO2 effectively. According to the thermodynamic calculation, in the cathodic electro-deoxidization process, SiO2 is more easily electrolyzed to the formation of metallic Si due to the worse stability in molten salt. Otherwise, the stability of CaSiO3 is better, resulting in the more difficulty for the reduction. The increase of electrolytic temperature is good for the decrease in the Gibbs free energy and the decomposition voltage of the electro-deoxidization reactions of SiO2 and CaSiO3. The anodic gas is composed of CO and CO2 as the graphite is chosen as the anode. The decomposition voltage of each reaction is decreased with the increase of the gaseous pressure, resulting in the positive process of the electrolytic reactions. |
| Close |
|
|
|