Abstract—In recent years, the demand for tantalum
capacitors has been increasing due to the miniaturization of
electronic devices. Tantalum capacitors, which use the rare
metal tantalum as the capacitor element, are used in electronic
devices such as cell phones because they are smaller and have a
higher capacity than conventional capacitors. In Japan, there
are reports that minerals containing rare elements are being
extracted from discarded electronic and electrical equipment to
produce medals for the 2020 Tokyo Olympics. In Japan, many
used electrical products containing rare elements are discarded,
and these metals are called urban mines. The tantalum
contained in tantalum capacitors accounts for 40% of the total
mass of the sintered material and is expected to be recycled
from discarded products. However, tantalum capacitors are
covered with a hard mold resin of
acrylonitrile-butadiene-styrene (ABS) resin, which is
chemically and physically stable. However, due to its nature,
ABS resin is difficult to destroy and has not been recycled. In
this study, hydrotalcite (HT) (Mg6Al2(OH)16CO3・MH2O) was
used to extract tantalum from the sintered tantalum capacitor
by pyrolysis. HT was added to the tantalum capacitor and
placed in a metal reactor and subjected to pyrolysis at 550℃ in
nitrogen to determine if the sintered tantalum was susceptible
to fracture. It is presumed that the bromine gas generated from
the ABS resin of the tantalum capacitor was trapped by the HT
and the mold resin of the capacitor became residual carbon.
Index Terms—Tantalum capacitors, hydrotalcite, pyrolysis.
The authors are with Tokyo Metropolitan High School of Science and Technology, Japan (e-mail: email@example.com, Ryuki.firstname.lastname@example.org, Naoyuki_Morita@education.metro.tokyo.jp).
Cite: Rinon Shimizu, Ryuki Hanazawa, and Naoyuki Morita, "Influence and Effect of Pyrolysis with Additives in Tantalum Capacitors," International Journal of Environmental Science and Development vol. 13, no. 4, pp. 138-143, 2022.Copyright © 2022 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).