Recycling of Tantalum Capacitors Via Sulfide Chemistry
Name
11663_2024_Article_3427.pdf
Size
3.1 MB
Format
Adobe PDF
Checksum (MD5)
dfe2e66f92571e24c5b0ec10bc616cbf
Author(s)
Boury, Charles
Allanore, Antoine
Date Issued
January 27, 2025
Journal
Metallurgical and Materials Transactions B
Publisher
Springer US
Citation
Boury, C., Allanore, A. Recycling of Tantalum Capacitors Via Sulfide Chemistry. Metall Mater Trans B (2025).
Version
Final published version
Abstract
The fabrication of tantalum capacitors represents more than 35 pct of the total consumption of metallic tantalum with an increasing demand for the high-technology sector. Tantalum capacitors contain a large concentration of tantalum, and the absence of niobium leads to interesting economic outcomes for potential recycling processes. The article discusses such recycling using sulfur, where an AB2O6 crystal structure analogous to the orthorhombic columbite-tantalite series is sulfidized. Sulfide affinities differences between A (Mn, Fe) and B (Nb, Ta) effectively separate the ternary oxide, capitalizing on the distinct chemical properties between A and B elements, in the absence of fluoridic acids. To bypass the fluoride-based chemistry process entirely, a proof of concept of tantalum disulfide (TaS2) production via sulfidation of Ta2O5 and its subsequent metallic reduction via molten sulfide electrolysis are also presented.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/s11663-024-03427-1
