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The cumulative percent passing as a function of particle size was shown in Fig. 4.2. It indicates that the P80 of the shredded material is around 1,700 μm. Table 4.2 presents the elemental compositions for the selected size fractions. It is clear from the experiment that the fractions of - 1410+595 μm and -595+297 μm had higher concentrations of the selected metallic elements than those from the other four size fractions. However, it is necessary to note that a large amount of the precious metals, especially gold and silver, could be found in the -105 μm material. Table 4.2 Elemental compositions for the selected size fractions of the shredded printed circuit boards Particle size (μm) -4760+2380 -2380+1410 -1410+595 -595+297 -297+210 -210+149 -149 Al Ni Cu Zn Sn Sb Pd Ag Au (%) (%) (%) (%) (%) (%) (%) 0.32 5.81 15.59 30.20 32.98 20.94 13.35 (ppm) (ppm) 113.96 32.50 181.34 53.59 235.96 93.92 338.25 81.23 330.23 38.64 358.21 41.31 264.49 109.80 2.42 0.77 1.63 0.67 2.22 0.71 1.63 0.47 1.66 0.24 1.76 0.21 3.44 0.34 13.57 2.65 0.87 21.71 4.46 4.15 0.25 32.97 6.32 6.86 0.18 36.42 1.67 3.63 0.22 27.75 0.80 1.87 0.24 21.48 0.80 1.68 0.28 4.2.5 MLA and QEMSCAN Analysis 8.09 0.69 1.16 0.24 9.33 In order to investigate the liberation and association of the desired metals within the shredded printed circuit boards, both MLA and QEMSCAN were performed. MLA was performed by water/methanol separation to remove the fine low density particles and hydrophobic material, which mostly consisted of fibrous paper and resin. The residue that has heavier density was treated by a heavy liquid separation using di-iodomethane (d=3.3 g/ml) to further remove circuit board resins and fibers floated in the heavy liquid. The denser particles remained in the bottom of the separation vessel were then analyzed by SEM-MLA. The MLA analysis also confirmed that copper was the most abundant metallic element and silver was the primary precious metal found in the printed circuit board. The MLA analysis also shows that copper is either present as a free copper particle (Fig. 4.3), or associated with other metals, such as silver (Fig, 4.4) and gold (Fig. 4.5). 41PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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