Performance Evaluation of Fine Particles Removal from Waste IC Board Carbonization Process via a Rotating Packed Bed
| Autor: | Gia Han Huynh, 黃嘉欣 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 The urban mining via electronic waste (e-waste) recycling process is a merging industries which several high-value precious metals can be collected to reduce natural degradation and depletion. To obtain those precious metals more effective, the e-waste pretreatments such as carbonization process are inevitable. In this study, the high-gravity rotating packed bed (HiGee RPB) was applied to grade down the air pollution, especially fine-sized particles due to its centrifugal force, also micro-mixing performance between gas and liquid phase. The carbonization process was considered to balance and qualify two conditions, including maximal of gold stripping efficiency with minimal of PM emission. The optimized condition was achieved at 800oC with the gold stripping efficiency reached up to 99.8%. Besides, the countercurrent RPB was operated to proceed on-site experiment under different operating condition such as high gravity factor and gas-to-liquid ratio. By using response surface method (RSM), the maximal achievable removal efficiency (MARE) was identified as 99.2% when high gravity of 323, gas-to-liquid ratio of 4.22. Moreover, empirical and semi-theoretical were developed basing on experiment results as well as several physical variables. Remarkably, the semi-theoretical was established to describe how the Brownian diffusion, inertial impaction as well as interception affect the removal efficiency in different size of particles. The U-shaped curve was determined with a minimum in the region around 1.9 µm. Finally, the concept of particles capture capacity was applied to illustrate the air-energy nexus issue. A motivation toward a cleaner production technology with the integration of carbonization process and high gravity RPB system was described with the expectedly providing a reference for optimizing design, or scaling up, also promising solution for efficient e-waste carbonization as well as particles emission controls in the future. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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