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not only require the high value of CC, but also is considerably influenced by particle shape, metal liberation and particle size. To further validate the possibility of gravity separation for the waste printed circuit boards, further experimental studies were presented in the following sections. Table 5.2 The concentration criterion (Laplante et al., 2002) Criterion > 2.5 2.5 – 1.25 < 1.25 Applicability Easy Possible Difficult Table 5.3 Specific gravity and concentration criterion for major components of PCBs Components SG (Mangroli et al, 2007; Harris, 2010) CC 1.14 2.2 1.57-2.86 1.14-1.23 1 11.29 26.14 13.57 FR4 1.80 E-glass Fiber 2.54 PTFE ceramic (RO3000) 2.1-3.0 Non-PTFE ceramic 1.8-1.86 Polyimide 1.70 Copper 8.96 Gold 19.30 Silver 10.5 5.2.2 Heavy Liquid Separation A heavy liquid separation analysis, following the Concentration Criterion calculation, was conducted to further determine whether or not a gravity separation could be feasible. 52PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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