Tantalum powder production by magnesiothermic reduction of TaCl5 through an electronically mediated reaction (EMR)
Tantalum powder production by magnesiothermic reduction of TaCl5 through an electronically mediated reaction (EMR)
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DOI：
10.1016/s0925-8388(98)00668-9
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发表时间：
1998-10
影响因子：
6.2
通讯作者：
I. Park;T. Okabe;Y. Waseda
中科院分区：
文献类型：
--
作者：
I. Park;T. Okabe;Y. Waseda
研究了用电子媒介反应（EMR）镁热还原五氯化钽（TaCl 5）生产钽粉的方法。在1073 K下将进料TaCl 5和还原剂镁合金装入熔融盐（例如NaCl-KCl-MgCl 2）中的电子隔离位置。在为电子流提供外部路径之后，监测进料和还原剂位置之间的电流。采用液态Mg-Ag-Ni合金作还原剂，在反应过程中检测到大于1A的大电流，得到了低镍、低银含量的钽粉。这清楚地表明，钽粉末可以通过电子介导反应（EMR）生产，而无需原料（TaCl 5）和还原剂（镁）之间的直接物理接触。利用含DyCl 2的熔盐作为反应介质，证明了溶于熔盐中的Dy 2+离子还原钽的可行性。利用等温化学势图讨论了TaCl_5在熔盐中镁热还原的机理。
Tantalum powder production by magnesiothermic reduction of tantalum pentachloride (TaCl5) through an electronically mediated reaction (EMR) has been examined. Feed material, TaCl5, and reductant magnesium alloy were charged into electronically isolated locations in the molten salt (e.g. NaCl–KCl–MgCl2) at 1073 K. After providing external path for electron flow, the current flow between the feed and the reductant locations was monitored. A large current, more than 1 A, was detected during the reaction and tantalum powder with low nickel and silver content was obtained, although liquid Mg–Ag–Ni alloy was used as the reductant. This clearly demonstrates that tantalum powder can be produced by electronically mediated reaction (EMR) without direct physical contact between the feed (TaCl5) and the reductant (magnesium). The feasibility of tantalum reduction using Dy2+ions dissolved in molten salt has also been demonstrated by utilizing molten salt containing DyCl2as a reaction mediator. The mechanism of magnesiothermic reduction of TaCl5in the molten salt is discussed using isothermal chemical potential diagrams.