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Table 5.6 Performance summary of shaking table for +210-1410 μm (0.5°) Product Grade (%) Au (ppm) 195.6 137.4 159.9 Ag (ppm) 927.0 56.7 458.7 Distribution (%) Cu. Au Ag Cu Conc. 50.2 Middling 1 5.0 Middling 2 & Tailing 28.4 5.2.4 Davis Tube 81.32 61.70 4.22 22.45 2.67 A series of Davis tube trials was conducted to remove iron and concentrate gold from the -210 μm materials, given that gold can be found in the iron alloys. Fig. 5.7 shows the distribution of copper, silver, iron, nickel and gold as a function of magnetic fields. Appendix E shows the full experimental data. As the magnetic field increases, the amounts of iron and nickel that are found in the non-magnetic fraction increase. Approximately more than 10% of the gold and silver are found to be separated along with iron and nickel. However, there is still around 80% of the gold and silver present in the non-magnetic fraction, which could be explained by the fact that the gold and silver occur either as liberated particles or are associated with other metals or the non-metallic materials. Fig. 5.7 also indicates that more than 98% of the copper is found in the non-magnetic material. In order to further separate gold from other non-magnetic materials, a series of microflotation studies was performed as presented in Section 5.2.5. 5.2.5 Microflotation A number of microflotation trials was conducted for the non-magnetic materials, which were obtained by Davis Tube magnetic separation at a magnetic field of 2,800 gauss. In the experiments, given that most polymers and fiber glass present in the printed circuit boards are naturally hydrophobic, there is no need to add collectors. Thus, three frothers, including Cytec AEROFROTHER 70 (MIBC equivalent), Cytec AEROFROTHER 65 (polypropylene 58 14.46 15.85 13.10 84.23PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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