Study on the Recovery of Pd and Ag from Multi-Layer Chip Capacitor
碩士 === 國立屏東科技大學 === 環境工程與科學系 === 91 === This study is targeted at using non-emitted nitrogen oxides (NOx) from wet chemical process for MLCC (Multi-Layer Chip Capacitor) leaching palladium and silver. Palladium and silver are the least elements in the earth. They are so expensive but widely applied...
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| Format: | Others |
| Language: | zh-TW |
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2003
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| Online Access: | http://ndltd.ncl.edu.tw/handle/44388470629160435562 |
| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系 === 91 === This study is targeted at using non-emitted nitrogen oxides (NOx) from wet chemical process for MLCC (Multi-Layer Chip Capacitor) leaching palladium and silver. Palladium and silver are the least elements in the earth. They are so expensive but widely applied in high-tec industriess. More than two hundred billion pieces of multi-layer chip capacitor are produced every year. An optimized leaching processes and low pollution technique from disposal MLCC of side waste material, waste semi-finished products and finished products are highly concerned. The research suggests that the optimized leaching condition can be found from the different HCl and NaClO3 concentrations and temperatures as the system parameters. The experiment results show that the best leaching condition after vibrated at 100 rpm for 2 hours are 5 M HCl and 0.4 M NaClO3 at 60℃ for palladium, and 9 M HCl and 0.6 M NaClO3 at 40℃ for silver. This leaching condition is currently adopted by palladium and silver producers for freeing of palladium and silver from base-metal (Cu、Pb、Zn、Sn、Ni). Additionally, washing Mitsubishi Chemical WA 30 ionic-exchange resin by the effluent 2 % NH3 can achieve the better recovery of palladium. The leaching process can be operated in the large scale industry and reduce the impact on the environment and human bodies.
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