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temperature. As the temperature further increases to 50°C, there is an increase of the initial gold dissolution rate; however, it does not positively affect the final gold dissolution, which could be explained by the fact that at the beginning of the leaching test, the high temperature accelerates the gold dissolution rate; as the leaching proceeds, the bromine starts to vaporize significantly due to the high temperature, having no positive effect on gold dissolution. Compared to the effect of sodium bromide and bromine, temperature seems less critical for the bromide leaching of shredded waste printed circuit boards. 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 Ni C u Zn Ag Au Pd 0 2 4 6 8 10 12 Time (hr) Figure 6.10 Bromine leaching of shredded waste printed circuit boards in the presence of 0.77M Br2 and 2.23M NaBr (400 RPM, 35 °C and natural pH) 6.3.4 Effect of Selected Acids There is a likelihood of using bromine and sodium bromide to dissolve valuable metals from shredded waste printed circuit boards. However, the high prices of bromine and sodium bromide, and the high consumption of sodium bromide during the process limit its industrial feasibility. Therefore, it is important to investigate alternative approaches to either replace sodium bromide or reduce the usage of sodium bromide. 74 Metal dissolved (%)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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