| Summary: | 碩士 === 大葉大學 === 環境工程學系研究所 === 107 === The purpose of this study is to recover palladium (Pd) metal resource from "palladium-containing wastes" for the domestic and foreign markets. The main processes adopted in this study involving collection of Pd-containing waste, composition analysis, leaching, pH adjustment, purification and recovery.
The result of this study shows that the moisture, ash and combustible content of the collected palladium-containing wastes are 2.33%, 92.32% and 5.35%, respectively. The metal content of Pd and aluminum (Al) in this sample are 506 mg/kg and 199,667 mg/kg, and the density analysis shows a value of 3.16 g/cm3. After grinding for 34 minutes, about 92.45% of the sample’s particles are smaller than 100 mesh (0.149 mm). The ground sample with a size of -100 mesh is used for following leaching tests in order to optimize the leaching recovery condition. The optimal leaching recovery rate of Pd and Al are 95.07% and 56.41%, by using a leaching condition of 10N hydrochloric acid (HCl) with solid-liquid ratio of 1g/50ml and addition 20ml of H2O2 at 70°C for 3 hours. 99.35% of Al and 6.87% of Pd contained in the optimal leaching solution can be precipitated by adjusting the solution’s pH to 8 with ammonia water. After filtration, the Pd-containing filtrate is crystallized at 70°C for 3 hours to obtain a Pd product. It contains 2169.37 mg/kg of Pd which can achieve a Pd enrichment rate of 4.29 times.
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