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5.2.6 Electrostatic Separation Since some valuable metals, such as copper and gold, in printed circuit boards are conductive, the goal of utilizing an electrostatic separation is to separate valuable metals in the conductive fraction from non-conductive materials, such as FR4. Table 5.6 shows the weight distribution between the conductive and non-conductive materials for different splitter positions. As shown in Table 5.6, three splitter positions were investigated for the material of -1410 + 707 μm. In principal, a further distance of the splitter from the drum should result in a higher concentration ratio as it was observed. However, at the concentration ratio of 1.65, approximately 25% of the gold was reported to the non-conductive fraction. Fig. 5.13 shows the metal distribution for the materials of -707+210 μm at 15kV. When the splitter position was fixed at 19, approximately 30% of gold and 20% of silver were reported to the non-conductive fraction. After the consideration of concentration ratio and recovery, electrostatic separation did not achieve considerable enrichment of valuable circuit boards. metals from printed 15kV Ratio of concentration 1.05 1.19 1.65 Splitter adjustment 17 19 21 Table 5.6 Corona electrostatic separation for -1410+707 μm at Metal Distribution (%) Product Con. Non-Con. Con. Non-Con. Con. Non-Con. Al Fe 94.7 97.9 5.3 2.1 79.0 88.3 21.0 11.7 70.0 65.0 30.0 35.0 Cu Ag 96.6 97.3 3.4 2.7 95.3 97.4 4.7 2.6 80.8 50.5 19.2 49.5 Au 92.5 7.5 89.7 10.3 73.7 26.3 63PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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