Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid
The recovery of platinum group metals (PGMs) from waste materials involves dissolving the waste in an aqueous solution. However, since PGMs are precious metals, their dissolution requires strong oxidizing agents such as chlorine gas and aqua regia. In this study, we aimed to recover PGMs via the cal...
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2021
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oai:doaj.org-article:f5be7e497bd0414ca9576f38520d01fd2021-11-25T18:14:03ZRecovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid10.3390/ma142268431996-1944https://doaj.org/article/f5be7e497bd0414ca9576f38520d01fd2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6843https://doaj.org/toc/1996-1944The recovery of platinum group metals (PGMs) from waste materials involves dissolving the waste in an aqueous solution. However, since PGMs are precious metals, their dissolution requires strong oxidizing agents such as chlorine gas and aqua regia. In this study, we aimed to recover PGMs via the calcination of spent automotive catalysts (autocatalysts) with Li salts based on the concept of “spent autocatalyst + waste lithium-ion batteries” and leaching with only HCl. The results suggest that, when Li<sub>2</sub>CO<sub>3</sub> was used, the Pt content was fully leached, while 94.9% and 97.5% of Rh and Pd, respectively, were leached using HCl addition. Even when LiF, which is a decomposition product of the electrolytic solution (LiPF<sub>6</sub>), was used as the Li salt model, the PGM leaching rate did not significantly change. In addition, we studied the immobilization of fluorine on cordierite (2MgO·2Al<sub>2</sub>O<sub>3</sub>·5SiO<sub>2</sub>), which is a matrix component of autocatalysts. Through the calcination of LiF in the presence of cordierite, we found that cordierite thermally decomposed, and fluorine was immobilized as MgF<sub>2</sub>.Shunsuke KuzuharaMina OtaRyo KasuyaMDPI AGarticleleachingPGMsLIBsrecyclingfluorine immobilizationTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6843, p 6843 (2021) |
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DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
leaching PGMs LIBs recycling fluorine immobilization Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
leaching PGMs LIBs recycling fluorine immobilization Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Shunsuke Kuzuhara Mina Ota Ryo Kasuya Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid |
| description |
The recovery of platinum group metals (PGMs) from waste materials involves dissolving the waste in an aqueous solution. However, since PGMs are precious metals, their dissolution requires strong oxidizing agents such as chlorine gas and aqua regia. In this study, we aimed to recover PGMs via the calcination of spent automotive catalysts (autocatalysts) with Li salts based on the concept of “spent autocatalyst + waste lithium-ion batteries” and leaching with only HCl. The results suggest that, when Li<sub>2</sub>CO<sub>3</sub> was used, the Pt content was fully leached, while 94.9% and 97.5% of Rh and Pd, respectively, were leached using HCl addition. Even when LiF, which is a decomposition product of the electrolytic solution (LiPF<sub>6</sub>), was used as the Li salt model, the PGM leaching rate did not significantly change. In addition, we studied the immobilization of fluorine on cordierite (2MgO·2Al<sub>2</sub>O<sub>3</sub>·5SiO<sub>2</sub>), which is a matrix component of autocatalysts. Through the calcination of LiF in the presence of cordierite, we found that cordierite thermally decomposed, and fluorine was immobilized as MgF<sub>2</sub>. |
| format |
article |
| author |
Shunsuke Kuzuhara Mina Ota Ryo Kasuya |
| author_facet |
Shunsuke Kuzuhara Mina Ota Ryo Kasuya |
| author_sort |
Shunsuke Kuzuhara |
| title |
Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid |
| title_short |
Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid |
| title_full |
Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid |
| title_fullStr |
Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid |
| title_full_unstemmed |
Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid |
| title_sort |
recovery of platinum group metals from spent automotive catalysts using lithium salts and hydrochloric acid |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/f5be7e497bd0414ca9576f38520d01fd |
| work_keys_str_mv |
AT shunsukekuzuhara recoveryofplatinumgroupmetalsfromspentautomotivecatalystsusinglithiumsaltsandhydrochloricacid AT minaota recoveryofplatinumgroupmetalsfromspentautomotivecatalystsusinglithiumsaltsandhydrochloricacid AT ryokasuya recoveryofplatinumgroupmetalsfromspentautomotivecatalystsusinglithiumsaltsandhydrochloricacid |
| _version_ |
1718411476687912960 |