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Tantalum Metal Production Through High-Efficiency Electrochemical Reduction of TaS 2 in Molten CaCl 2
Journal of Sustainable Metallurgy ( IF 2.5 ) Pub Date : 2021-03-09 , DOI: 10.1007/s40831-021-00347-1
Eltefat Ahmadi , Ryosuke O. Suzuki

The electro-calciothermic reduction of tantalum sulfide (TaS2) was applied to open a new pathway for producing high-purity Ta powders applicable for tantalum electrolytic capacitors. The supplied electric charge was varied to electrochemically reduce the sulfide at 900 °C using Ca in molten CaCl2xCaS (x = 0.1, 0.5 mol%) salts. The cleaner TaS2 could also be prepared via the highly efficient carbo-sulfidation of Ta2O5 using S2 gas. The plate-like Ta particles with internal voids and coral structures were obtained through the electrochemical reduction of the sulfides. Sulfur removal was achieved rapidly from TaS2. Ta powder with 0.08 mass% O and 0.01 mass% S was successfully produced from Ta2O5 via clean TaS2. It was obtained by increasing the electric charge to two times higher than that required to generate the stoichiometric amount of Ca in the CaCl2 melt. Therefore, the electrometallurgical reduction of TaS2 could be a promising, cost-effective, and sustainable approach for producing high-purity Ta powders.

Graphical Abstract



中文翻译:

通过高效电化学还原熔融CaCl 2中的TaS 2生产钽金属

硫化钽(TaS 2)的电热还原法被用于开辟一条新途径,以生产适用于钽电解电容器的高纯度Ta粉。改变所提供的电荷以使用熔融的CaCl 2 - x CaS(x  = 0.1,0.5 mol%)盐中的Ca在900°C下电化学还原硫化物。还可以通过使用S 2气体对Ta 2 O 5进行高效碳硫化来制备更清洁的TaS 2。通过硫化物的电化学还原获得具有内部空隙和珊瑚结构的板状Ta颗粒。从TaS 2迅速实现了脱硫。通过清洁的TaS 2由Ta 2 O 5成功地制造出具有0.08质量%的O和0.01质量%的S的Ta粉末。它是通过将电荷增加到比在CaCl 2熔体中生成化学计量的Ca所需的电荷高两倍的电荷而获得的。因此,电冶金还原TaS 2可能是生产高纯度Ta粉的一种有前途的,具有成本效益的和可持续的方法。

图形概要

更新日期:2021-03-09
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