Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes
Electronic products are ever growing in popularity, and tantalum capacitors are heavily used in small electronic products. Spent epoxy-coated solid electrolyte tantalum capacitors, containing about 22 wt.% of tantalum and 8 wt.% of manganese, were treated with selective leaching by hydrochloric acid...
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MDPI AG
2022-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/2/656 |
| _version_ | 1797492364255690752 |
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| author | Wei-Sheng Chen Chih-Yuan Hsiao Cheng-Han Lee |
| author_facet | Wei-Sheng Chen Chih-Yuan Hsiao Cheng-Han Lee |
| author_sort | Wei-Sheng Chen |
| collection | DOAJ |
| description | Electronic products are ever growing in popularity, and tantalum capacitors are heavily used in small electronic products. Spent epoxy-coated solid electrolyte tantalum capacitors, containing about 22 wt.% of tantalum and 8 wt.% of manganese, were treated with selective leaching by hydrochloric acid and chlorination after removing the epoxy resin, and the products converted, respectively, to Mn(OH)<sub>2</sub> and TaCl<sub>5</sub>. The effects of acid type, acid concentration, liquid–solid ratio, and reaction time were investigated to dissolve the manganese. The optimal selective leaching conditions were determined as 3 mol/L of HCl, 40 mL/g at 25 °C for 32 min. Next, residues of selective leaching after washing and drying were heated with ferrous chloride to convert to pure TaCl<sub>5</sub>. Mixing 48 wt.% of chloride and 52 wt.% of residues for a total of 5 g was conducted to complete the chlorination process in the tube furnace at 450 °C for 3 h. A total of 2.35 g of Ta was collected and the recovery of Ta achieved 94%. Finally, Mn(OH)<sub>2</sub> and TaCl<sub>5</sub> were separated and purified as the products. |
| first_indexed | 2024-03-10T01:02:37Z |
| format | Article |
| id | doaj.art-73c83b0645d945a3adcabe2d40555520 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:02:37Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-73c83b0645d945a3adcabe2d405555202023-11-23T14:32:43ZengMDPI AGMaterials1996-19442022-01-0115265610.3390/ma15020656Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination ProcessesWei-Sheng Chen0Chih-Yuan Hsiao1Cheng-Han Lee2Department of Resources Engineering, National Cheng Kung University, No. 1 Daxue Road, Tainan 701401, TaiwanDepartment of Resources Engineering, National Cheng Kung University, No. 1 Daxue Road, Tainan 701401, TaiwanDepartment of Resources Engineering, National Cheng Kung University, No. 1 Daxue Road, Tainan 701401, TaiwanElectronic products are ever growing in popularity, and tantalum capacitors are heavily used in small electronic products. Spent epoxy-coated solid electrolyte tantalum capacitors, containing about 22 wt.% of tantalum and 8 wt.% of manganese, were treated with selective leaching by hydrochloric acid and chlorination after removing the epoxy resin, and the products converted, respectively, to Mn(OH)<sub>2</sub> and TaCl<sub>5</sub>. The effects of acid type, acid concentration, liquid–solid ratio, and reaction time were investigated to dissolve the manganese. The optimal selective leaching conditions were determined as 3 mol/L of HCl, 40 mL/g at 25 °C for 32 min. Next, residues of selective leaching after washing and drying were heated with ferrous chloride to convert to pure TaCl<sub>5</sub>. Mixing 48 wt.% of chloride and 52 wt.% of residues for a total of 5 g was conducted to complete the chlorination process in the tube furnace at 450 °C for 3 h. A total of 2.35 g of Ta was collected and the recovery of Ta achieved 94%. Finally, Mn(OH)<sub>2</sub> and TaCl<sub>5</sub> were separated and purified as the products.https://www.mdpi.com/1996-1944/15/2/656tantalum capacitormanganeseselective leachingchlorinationrecovery |
| spellingShingle | Wei-Sheng Chen Chih-Yuan Hsiao Cheng-Han Lee Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes Materials tantalum capacitor manganese selective leaching chlorination recovery |
| title | Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes |
| title_full | Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes |
| title_fullStr | Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes |
| title_full_unstemmed | Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes |
| title_short | Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes |
| title_sort | recovery of tantalum and manganese from epoxy coated solid electrolyte tantalum capacitors through selective leaching and chlorination processes |
| topic | tantalum capacitor manganese selective leaching chlorination recovery |
| url | https://www.mdpi.com/1996-1944/15/2/656 |
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