|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Effect of diluent and temperature for the production of Ta powder via the Hunter Process
||Yongkwan Lee, Jae Jin Sim, Kee ahn Lee, Seok Jun Seo, Kyoung tae Park
|On-Site Speaker (Planned)
Commercially, the Hunter process is mostly used for the production of Ta powder. It is a simple process and can give high purity Ta, but economically it is disadvantageous as it uses expensive KCl and KF as a diluent mixture.
Thus, in this study, NaCl was selected as a diluent for the Hunter process, which consumes higher endothermic energy than KCl and KF, and is easy to remove after the process. Also, the temperatures used were lower. A thermochemical software was used to predict the steps. After that, K2TaF7, Na and 1.9–26 moles of NaCl were added. The experiment was carried out in a temperature range of 690 to 800 °C. The treatment temperature and NaCl molar parameters were optimized in consideration with the Ta metal powder properties. High quality Ta single phase was obtained with particle D50 of 6.215 µm, while the oxygen content was 447 ppm.