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| Strontium Preparation with Vacuum Calcium Carbide Process |
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Received:March 15, 2019
Revised:March 22, 2019
Accepted:March 25, 2019
Published Online:May 17, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.06.012 |
| KeyWord:strontium; vacuum; calcium carbide; strontium oxide; thermal reduction; |
| Author | Institution |
| Zou Xingwu |
中国科学院青海盐湖研究所 |
| Shi Yongming |
中国科学院青海盐湖研究所 |
| Wang Shuxuan |
中国科学院青海盐湖研究所 |
| Li Bo |
中国科学院青海盐湖研究所 |
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| Abstract: |
| Thermodynamic analysis of preparation of strontium from strontium oxide by vacuum calcium carbide thermal reduction was carried out, and Gibbs free energy and critical temperature were calculated. Metal strontium was prepared by vacuum calcium carbide reduction process with strontium oxide and calcium fluoride as raw material. The effects of reduction temperature, holding time, briquetting pressure, calcium carbide excess coefficient on strontium reduction rate were studied. The results show that strontium with purity of 98%~99% and strontium reduction rate of 72.8% can be achieved under the following optimum conditions including vacuum degree of 0~100 Pa, calcium carbide excess coefficient of 20%, briquetting pressure of 15 MPa, reduction temperature of 1 300 ℃, and holding time of 3 h. |
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