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| Preparation of Metal Samarium by Direct Reduction-Distillation of Samarium-Gadolinium Enrichment |
| Received:September 22, 2017 Revised:September 27, 2017 |
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| DOI：10.3969/j.issn.1007-7545.2018.03.016 |
| KeyWord:samarium-gadolinium enrichments; direct reduction; distillation; metallic samarium |
| Author | Institution |
| haozhanzhong |
包头师范学院 |
| Xu lincheng |
包头师范学院 |
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| Abstract: |
| The effects of reduction-distillation temperature and time on yield of metallic samarium were studied by direct reduction-distillation of oxides applying samarium-gadolinium enrichment after extraction of europium as raw materials and metallic lanthanum as reductant. Distribution law of impurities in metallic samarium in different zone of metal receiver was analyzed. The results show that yield of metallic samarium is 93.6% under the optimum conditions including molar ratio of samarium-gadolinium enrichment and metallic lanthanum of 1︰2.5, system pressure of 0.1 Pa, reduction-distillation temperature of 1 600 K, and time of 1.5 h. The yield will decline when temperature is higher than 1 600 K. The impurities with higher vapor pressure than metallic samarium and lower desublimation point mainly deposite in upper zone of receiver. The impurities with lower vapor pressure than metallic samarium and higher desublimation point mainly deposite in lower zone of receiver. The deposition of gas impurities of nitrogen, oxygen and carbon in three zone of receiver is basically equal, while chlorine is higher in upper zone. The purity of metallic samarium in middle zone can reach 99.92%. |
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