| SiO2的熔盐电解还原反应热力学分析 |
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| 引用本文： | 周忠仁,张英杰,华一新,董鹏.SiO2的熔盐电解还原反应热力学分析[J].矿冶,2020,29(3). |
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| 作者姓名： | 周忠仁 张英杰 华一新 董鹏 |
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| 作者单位： | 昆明理工大学 冶金与能源工程学院;锂离子电池及材料国家地方联合工程实验室,昆明理工大学 冶金与能源工程学院,昆明理工大学 冶金与能源工程学院,昆明理工大学 冶金与能源工程学院 |
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| 基金项目： | 国家自然科学“熔盐电化学合成TiSi2/Si复合材料及其储锂性能的研究”(51804148)；云南省应用基础研究计划项目“短流程制备微纳米级高钛铁合金的电化学控制机理研究”(2018FD038)。 |
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| 摘 要： | 熔盐电解SiO2制备单质Si过程中,电解温度、气体分压对SiO2的电解还原反应具有显著影响。热力学计算结果表明,在阴极电脱氧过程中SiO2的稳定性差,能够容易被电解还原生成单质Si,而中间产物CaSiO3稳定性好,其进一步电解还原相对困难。升高温度有利于降低SiO2和CaSiO3的电脱氧反应吉布斯自由能和分解电压。当以石墨为阳极时,气体组成包括CO和CO2,且各电解反应的分解电压随着气体分压的增大而降低,有利于电解反应的正向进行。
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| 关 键 词： | SiO2 熔盐电解 温度 气体分压 热力学计算 |
| 收稿时间： | 2019/10/18 0:00:00 |
| 修稿时间： | 2019/11/4 0:00:00 |
Study on the thermodynamic analysis of the electrochemical reduction of SiO2 in molten salt |
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| ZHOU Zhong-ren,ZHANG Ying-jie,HUA Yi-xin and DONG Peng.Study on the thermodynamic analysis of the electrochemical reduction of SiO2 in molten salt[J].Mining & Metallurgy,2020,29(3). |
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| Authors: | ZHOU Zhong-ren ZHANG Ying-jie HUA Yi-xin and DONG Peng |
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| Affiliation: | 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,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology |
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| 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. |
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| Keywords: | SiO2 molten-salt electrolysis temperature gaseous pressure thermodynamic calculation |
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