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and denser particles can be recovered at the far end, while the larger, lighter particles can be collected in the feed end. Several factors, including nature of feed, specific gravity, riffling, speed and stroke, table tilt, water flow rate and process stages, should be optimized to achieve optimum performance in the operation of the shaking table. A Deister shaking table was used to pre-concentrate printed circuit boards. In this study, the materials with the size range of +210-1410 μm and -210 μm were performed due to the size limitation of the shaking table. An initial 780 grams of PCBs were split into three fractions. The process variables, including table tilt, feeding water flow and trough water flow, are shown in Table 5.1, and were adjusted to ensure that a flow film was created across the entire table. The other variables, stroke and frequency, were kept constant at 24 mm/stroke and 268 strokes per minute, respectively. Due to the hydrophobic property of PCBs, approximately 260 grams dry material was first mixed with water for 15 minutes, and then tabled, yielding a concentrate, two middlings and a tailing product shown in Fig. 5.1. Each product was dried, weighted and prepared by acid digestion. The chemical composition was then analyzed by ICP-MS. Table 5.1 Shaking table parameters Test # Table Tilt (°) Feed Water (gpm) Trough Water (gpm) 1 0.8 1 1 2 0.5 1 1 5.1.3 High Tension Electrostatic Separation High tension separation was conducted by utilizing the difference in surface conductivity of each material. Samples were fed into the drum to create a monolayer as much as possible. The electrostatic separator used was the Mineral Technologies Laboratory Carrara High Tension Roll Separator. Fig. 5.2 shows schematically the operation of the electrostatic separator. In this work, the corona wire position was fixed at 60 mm. The speeds of the feed roller and separation roller were set at 4 and 130 rpm, respectively. The splitter position and voltage to the electrode were varied. Each product was weighed and digested. The composition of the products was then determined by ICP-MS. 48PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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