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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 Ag Pd Au Figure 6.9 Bromine leaching of shredded waste printed circuit boards in the presence of 0.77M Br2 and 2.23M NaBr (400 RPM, 23.5 °C and natural pH) dissolving base metals, given that the base metals have approached high dissolutions (>95%). However, in order to achieve high extractions for the metals of interest, the high consumption of liquid bromine and sodium bromide are likely to be required, which reduces the practical feasibility of this process. Therefore, more efforts should be made to study the effect of temperature and other chemical reagents that can either replace or reduce the consumption of bromine and sodium bromide. 6.3.3 Effect of Temperature Given that the boiling point of bromine is 58.8°C, temperature chosen in this study was lower than 58.8 °C in order to prevent the excessive loss of bromine. Thus, 35°C and 50°C were chosen to perform leaching experiments in the presence of 0.77M Br2 and 2.23M NaBr. Experimental results are presented in Fig. 6.10 and Fig. 6.11, and more detail can be found in Table F8 and F9. Generally, the temperature of 35°C accelerates the initial dissolution for each metal studied and increases the silver dissolution. However, the increase of temperature does not significantly shorten the reaction time, comparing with the leaching time required at room 73 Metal dissolved (%)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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