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4.2.1 Sample Preparation The waste printed circuit board sample shown in Fig. 4.1 was obtained from Aurubis. All of the aluminum heat sinks and lithium ion batteries were removed from the motherboards to prevent being stuck in the Wiley Mill. All of the motherboards were shredded into approximately 2 cm2 and then split into approximately 60 kg by Jones splitter. A Fellner Ziegler Model FZK126 Wiley-Mill shredder with a 1 cm round-hole screen was employed to further grind the material. After mixing and splitting, the 27.8 kg of -1 cm material was then ground again by Wiley-Mill shredder to -5 mm. The 27.8 kg of -5 mm material was then split to 7 kg samples which were used for subsequent experiments. Figure 4.1 Picture of the waste printed circuit boards 4.2.2 Chemical Analysis Methods In order to quantitatively evaluate elemental distribution of waste printed circuit boards, it is critical to establish a scientific and accurate analytical method. Given that some elements within 37PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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