| 电脱氧Nb2O5制取金属铌 |
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| 引用本文： | 王兴庆,谢大海,陈伟.电脱氧Nb2O5制取金属铌[J].上海大学学报(自然科学版),2011(6):757-761. |
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| 作者姓名： | 王兴庆 谢大海 陈伟 |
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| 作者单位： | 上海大学材料科学和工程学院; |
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| 基金项目： | 上海市基础研究重点资助项目(08JC1410100) |
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| 摘 要： | 以Nb2O5粉末烧结片为阴极,以石墨为阳极,在CaC12-NaCl熔盐电解质中对Nb2O5进行电脱氧,获得金属铌.对不同密度的Nb2O5粉末烧结阴极的制取以及烧结阴极密度对电脱氧Nb2O5的影响进行研究.结果表明,阴极片的烧结密度对Nb2O5在CaC12-NaCl熔盐中的电脱氧有着极其重要的影响,烧结密度越低,电解起始电流越大,并且在电脱氧过程中电流也越大;在相同电解时间内,阴极产物中残余氧化物化合价随阴极片密度的降低而降低;Nb2 O5粉末在8 MPa压力下成型,1 150℃下烧结8 h,所得的阴极片具有较好的电化学活性;在850℃下电解150 min,Nb2 O5可完全被还原;电脱氧反应速度会随电解时间的延长而逐渐减慢.实验结果表明,电脱氧是氧化物粉末颗粒与熔盐电解质接触、反应和电离的过程,Nb2O5的电脱氧过程是分步进行的,其中间产物是铌的一系列低价氧化物,即Nb5+→Nb4+→Nb2+→Nb.
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| 关 键 词： | 电脱氧 铌的制备 Nb2O5还原 熔盐电化学 |
Preparation of Metal Niobium with Electrodeoxidation of Nb_2O_5 |
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| WANG Xing-qing,XIE Da-hai,CHEN Wei.Preparation of Metal Niobium with Electrodeoxidation of Nb_2O_5[J].Journal of Shanghai University(Natural Science),2011(6):757-761. |
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| Authors: | WANG Xing-qing XIE Da-hai CHEN Wei |
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| Institution: | WANG Xing-qing,XIE Da-hai,CHEN Wei(School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China) |
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| Abstract: | A novel technique of electrodeoxidation was studied for preparation of metal niobium.Nb2O5 was electrodeoxided in a eutectic melt of CaC12-NaCl with a sintered compact as a cathode and graphite as an anode.Nb2O5 cathodes with different density were prepared by sintered and influence of density of the cathodes on electrodeoxidation was investigated.The results show that density of sintered Nb2O5 cathodes has important effect on electrodeoxidaion of Nb2O5 in a eutectic melt of CaC12-NaCl.The lower the density... |
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| Keywords: | electrodeoxidation niobium preparation Nb2O5 reduction molten salt electrochemistry |
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