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100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 0 2 4 6 8 10 12 Time (hr) Ni Cu Zn Pd Ag Au Figure 6.6 Bromine leaching of shredded waste printed circuit boards in the presence of 1.16M Br2 (400 RPM, 23.5 °C and natural pH) 6.3.2 Effect of Sodium Bromide As stated in previous studies (Pesic et al., 1993; Kelsall et al., 1993; Dadgar, 1988), both bromine and sodium bromide are responsible for gold dissolution. It is necessary to investigate the effect of sodium bromide in the presence of bromine, given that sodium bromide itself cannot provide an ORP that is higher than 0.87V (vs SHE). Taking 0.78M as the bromine concentration, a series of leaching trials was performed to investigate the effect of sodium bromide at room temperature (23.5 °C) and natural pH. Fig. 6.7, 6.8 and 6.9 present leaching performances at various concentrations of sodium bromide, 1.17M, 1.75M and 2.33M. Table F5, F6 and F7 present mass balance calculations for the three experiments. It is obvious that the addition of sodium bromide has a positive effect on the dissolution of precious metals (Au, Ag, and Pd). The addition of sodium bromide raises the gold dissolution from approximately 83% (no NaBr) to more than 96% (1.75M NaBr). Moreover, more than 90% of palladium can be dissolved in the presence of 2.33M NaBr. Compared to the extraction of base metals in the presence of Br2, the addition of sodium bromide only has a slightly positive effect on 71 Metal dissolved (%)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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