Abstract
The dissolution of MnO2 from tantalum capacitor scrap using organic acids in various process conditions was studied. The initial materials were of two types: LTC (leaded tantalum capacitors) and SMDTC (surface-mounted device tantalum capacitors). The research materials were prepared by pyrolysis, grinding and sieving and the preparation processes were characterized. Dissolution of MnO2 was carried out with the use of sulfuric acid solutions with the addition of acetic, ascorbic, citric and oxalic organic acids. Results show that the addition of organic acids significantly improves dissolution yields (72-94 vs 90-99 % for H2SO4 and acid mixtures, respectively). In practice, a concentration of organic acid above 1 M results in the complete removal of MnO2.
Highlights
The publication of a list of critical raw materials for the European Union (EU) [1, 2] shows that tantalum is one of them
The initial materials were of two types: leaded tantalum capacitors (LTC) and surface-mounted device tantalum capacitors (SMDTC)
Tantalum has many uses, such as for heat exchange, as a superalloy additive, for sputtering and others, but the most important use is for tantalum capacitors (TC) which are characterized by a high electrical capacity
Summary
The publication of a list of critical raw materials for the European Union (EU) [1, 2] shows that tantalum is one of them. DISSOLUTION OF MANGANESE (IV) OXIDE FROM TANTALUM CAPACITOR SCRAP BY ORGANIC ACIDS Abstract The dissolution of MnO2 from tantalum capacitor scrap using organic acids in various process conditions was studied.
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