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Figure 1.1 Figure 2.1 Figure 3.1 Figure 3.2 Figure 3.3 Figure 3.4 Figure 3.5 Figure 3.6 Figure 3.7 Figure 3.8 Figure 4.1 Figure 4.2 Figure 4.3 Figure 4.4 Figure 4.5 Figure 4.6 Figure 4.7 Figure 4.8 Figure 4.9 Figure 4.10 Figure 5.1 Figure 5.2 Figure 5.3 Figure 5.4 Figure 5.5 Figure 5.6 Figure 5.7 Figure 5.8 Figure 5.9 LIST OF FIGURES Global e-waste generation from 2010 to 2018 ........................................................ 2 A typical schematic flowsheet of PCB recycling .................................................. 10 Halide activity-pH diagram for gold-halide-water systems with 10-3 activity of Au(III) species in equilibrium with Au(OH)3(c) at 298K ..... 24 Eh- pH diagram for a Br-H2O system at 298.15 K for [Br]=2M.......................... 26 Speciation-pH diagram for a Br-H2O system at 298.15 K and Eh = 0.8V ........... 27 Speciation-pH diagram for a Br-H2O system at 298.15 K and Eh = 1V .............. 27 Eh-pH diagram of Br-Au-H2O system at 25 °C ................................................... 28 Eh-pH diagram of Br-Ag-H2O system at 25 °C .................................................. 29 Eh-pH diagram of Br-Pd-H2O system at 25 °C ................................................... 29 Eh-pH diagram of Br-Cu-H2O system at 25 °C ................................................... 30 Picture of the waste printed circuit boards ............................................................ 37 Size distribution of shredded PCBs (Calculated from five samples) .................... 42 Classified MLA image from the shredded PCB residue material ......................... 43 BSE image from the shredded PCB residue material............................................ 43 Gold-containing particles from the shredded PCB residue (sink) material........... 44 Image of isolated gold particles in the shredded printed circuit boards ................ 44 Silver with tin and lead.......................................................................................... 45 Palladium and silver on BaTiO ............................................................................. 45 Palladium and silver on NdTiO ............................................................................. 45 QEMSCAN elemental image mapping of one particle (-4760+2830 μm) ........... 46 The product distribution in shaking table .............................................................. 49 Schematic structure of a corona electrostatic separator ........................................ 49 Schematic of a Partridge-Smith microflotation cell .............................................. 51 Heavy liquid separation in terms of +1410-4760 μm PCBs ................................. 54 Heavy liquid separation in terms of +210-1410 μm PCBs ................................... 55 Shaking table streams ............................................................................................ 55 Metals retained in the non-magnetic fraction as a function of magnetic field ...... 59 Metal distribution in sinks with various pH in the presence of Frother 70 ........... 60 Effect of Na2S in the presence of Frother 70......................................................... 61 viiiPDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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