Semi-continuous Production of Niobium Powder by Magnesiothermic Reduction of Nb2O5
Semi-continuous Production of Niobium Powder by Magnesiothermic Reduction of Nb2O5
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Nb2O5 磁热还原半连续生产铌粉
DOI：
10.2320/matertrans.42.850
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发表时间：
2001
影响因子：
1.2
通讯作者：
Oh
中科院分区：
文献类型：
--
作者：
I. Park;T. Okabe;Y. Waseda;H. Yu;Oh
电子介导反应（EMR）已被探索通过氧化铌的镁热还原半连续生产铌粉末。 Nb 2 O 5 原料和还原剂镁合金在1173 K的熔融CaCl 2 浴中进行电子隔离。进料重新充电两次，但在三次重复测试中重复使用浴而无需补充，为电子流提供了外部路径。监测流经进料（阴极）和还原剂（阳极）之间的外部路径的电流。在外部电路中测量到 0.05 至 0.1 A 之间的小电流。铌粉很容易获得，但随着还原数的增加，其纯度从 93% Nb 降至 82% Nb。然而，这证明了通过 EMR 半连续生产铌粉末的可能性，而无需反应物之间的直接物理接触。利用等温化学势图讨论了熔盐中Nb 2 O 5 的镁热还原机理。
An electronically mediated reaction (EMR) has been explored to produce a niobium powder semi-continuously by the magnesiothermic reduction of niobium oxide. Nb 2 O 5 feedstock and reductant magnesium alloy were isolated electronically in a molten CaCl 2 bath at 1173 K. The feed was freshly recharged twice, but the bath was reused without replenishment during three repeated tests, providing an external path for electron flow. The current flow through the external path between the feed (cathode) and the reductant (anode) was monitored. A small current between 0.05 and 0.1 A was measured in the external circuit. A niobium powder was readily obtained, but its purity decreased from 93 to 82% Nb as the reduction number increased. This, however, demonstrated the possibility of semi-continuous production of niobium powders by the EMR without the direct physical contact between the reactants. The mechanism of the magnesiothermic reduction of Nb 2 O 5 in the molten salt was discussed, using an isothermal chemical potential diagram.