Secondary reduction of tantalum in NaCl – KCl and KCl – CaCl2 molten salts

Synthesis of Tantalum Powders in KBr−NaBr and KI−NaI Melts Using Electrochemical Pulverization

“…The tantalum powders were obtained by the secondary reduction in the KClÀ NaCl and KClÀ CaCl 2 melts. [16] The authors established a similar dependence of the specific surface area of the powder on the ratio of current densities presented in scientific paper. [15] [a] A. S. Shmygalev, A. V. Isakov, Dr. Y. P. Zaikov The methods described in papers [13][14][15][16] do not require a preliminary production of the reducing metal.…”

“…The tantalum powders were obtained by the secondary reduction in the KCl−NaCl and KCl−CaCl 2 melts . The authors established a similar dependence of the specific surface area of the powder on the ratio of current densities presented in scientific paper …”

“…Reference data related to the changes in density of equimolar melts of alkali metal halides depending on temperature. [17,18] conditions in paper, [16] one can conclude that an increase in the size of the anion in the molten salt leads to the formation of metal particles with more developed surface. A decrease in the temperature of the iodide melt also leads to a rise in the specific surface of the synthesized powder.…”

“…This trend is also observed for the chloride system. [16] According to the BET analysis, the specific area of the tantalum powders was found to be 5.8 and 6.1 m 2 /g for the bromide and iodide systems, respectively. Taking into account the specific area of tantalum powder obtained under similar 6.…”

“…The distribution by particle sizes for the powder obtained in the NaClÀ KCl system was borrowed in research [16] for comparison. It was found that in all cases there are two main extrema in the curve of the volume distribution and one secondary, which is located in the region of large particles.…”