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Resources 2014, 3 155 Generally, PCBs are crushed into smaller sizes (less than 1–2 mm) and various techniques including magnetic, electrostatic, electrowinning, and selective dissolution are implemented to separate the components [6–13]. Yamane et al. [14] investigated the composition of spent PCBs from mobile phones and personal computers. Preprocessing included crushing and then separation by magnetic and electrostatic techniques. Chemical analysis was conducted using aqua regia leaching, loss on ignition and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The results showed that PCBs from mobile phones had higher (34.5%) copper contents compared to personal computers (20%). The typical composition of PCBs from different sources is given in Table 3. Table 3. Typical compositions of printed circuit boards (PCBs) [6,15]. Reproduced with permission from [16–19]. Materials Metals (Max. wt. 40%) Cu Al Pb Zn Ni Fe Sn Typical Concentrations (in wt% and ppm) Shuey and Taylor [16] 20 2 2 1 2 8 4 Kim et al. [17] 15.6 Iji and Ewasteguide.info [19] Yokoyama [18] Sb/ppm 0.4 Au/ppm 1000 Ag/ppm 2000 Pd/ppm 50 10 Ge/ppm - - As/ppm - - Ti/ppm - - In/ppm - - Ta/ppm - - Co/ppm - - Se/ppm - - Ga/ppm - - 22 6.9 - - 14.2 1.35 0.16 0.28 1.4 3.24 1.55 6.3 - 2.2 0.32 0.85 3.6 20.5 2.6 1.0 -- 20 350 20 - 200 - - - 20 - 10 - 200 - 20 - 200 - 200 - 20 - 10 Iji and Ewasteguide.info [19] Yokoyama [18] 30 24.9 Iji and Ewasteguide.info [19] Yokoyama [18] 420 1240 Ceramics (Max. wt. 30%) SiO2 Al2O3 Alkali and alkaline earth oxides Titanates and mica, etc. Plastics (Max. wt. 30%) Polyethylene Polypropylene Polyesters Epoxies Polyvinyle chloride Polytetraflouroethane Nylon Shuey and Taylor [16] 15 6 6 3 Shuey and Taylor [16] 9.9 4.8 4.8 4.8 2.4 2.4 0.9 Kim et al. [17] 41.86 6.97 CaO 9.95 - Kim et al. [17] - - - - - - - Total of all plastics 16 wt% Total of all plastics 23 wt%PDF Image | Metal Extraction Processes for Electronic Waste
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