Semi-Continuous Production of Tantalum Powder by Electronically Mediated Reaction (EMR)
Semi-Continuous Production of Tantalum Powder by Electronically Mediated Reaction (EMR)
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通过电子介导反应 (EMR) 半连续生产钽粉
DOI：
10.2320/matertrans.43.2080
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Y. Waseda
中科院分区：
文献类型：
--
作者：
I. Park;T. Okabe;Oh;Chuel Ro Lee;Y. Waseda
研究了一种半连续化的电子介导反应（EMR）-钙热还原氯化钽（TaCl5）制备钽粉。在1123K的CaCl2熔池中，将TaCl5原料和还原剂钙合金加入到电隔离的位置。将进料新鲜再装填三次，但在四次重复的还原实验期间将浴重复使用而不补充。监测通过进料（阴极）和还原剂（阳极）位置之间的外部路径的电流。在反应期间，在连接阴极和阳极的外部电路中测量到0.2和0.9安培之间的电流。钽粉在每次实验后容易获得，但其纯度随着运行次数的增加从95%降低到87%Ta。与金属热还原法相比，电磁辐射法制备的钽粉质量较好。采用液态Ca-Al-Ni合金作还原剂，可得到铝镍含量较低的钽粉。结果表明，在没有原料和还原剂之间的直接物理接触的情况下，通过EMR半连续生产钽粉的可能性。用等温化学势图讨论了TaCl5在熔盐中的钙热还原机理。
An electronically mediated reaction (EMR) has been explored to produce tantalum powder semi-continuously by the calciothermic reduction of tantalum chloride (TaCl 5 ). TaCl 5 feedstock and reductant calcium alloy were charged into electronically isolated locations in a molten CaCl 2 bath at 1123 K. The feed was freshly recharged three times, but the bath was reused without replenishment during four repeated reduction experiments. The current flow through an external path between the feed (cathode) and reductant (anode) locations was monitored. A current between 0.2 and 0.9 amps was measured during the reaction in the external circuit connecting cathode and anode. Tantalum powder was readily obtained after each experiment, but its purity decreased from 95% to 87%Ta as the run number increased. Tantalum powder obtained from EMR was fine compared with that of metal powder metallothermic reduction. Tantalum powder with low aluminum and nickel content was obtained although liquid Ca-Al-Ni alloy was used as the reductant. The results demonstrate the possibility of semi-continuous production of tantalum powder by the EMR without the direct physical contact between the feed and reductant. The mechanism of the calciothermic reduction of TaCl 5 in the molten salt was discussed, using an isothermal chemical potential diagram.