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9. Rinse the filter paper three times by deionized water 10. Add another 40 mL of 30g/L H3BO3 to the bottle (#2) 11. Weigh the bottle (#2) and add deionized water to make up around 300 g of the solution 12. Take 30 mL sample, store in a 50-mL polypropylene vial and label 6.3 Leaching Experimental Results Two types of bromine sources (liquid bromine and 1,3-Dibromo-5,5,-dimethylhydantoin) were investigated in this study and discussed respectively in the following sections. 6.3.1 Effect of Liquid Bromine A series of leaching trials was conducted to investigate the effect of initial liquid bromine concentrations on leaching gold and silver from shredded waste printed circuit boards, given that bromine is not only the source of bromide ions, but also acts as an oxidant, offering a high potential (approximately 1.1V). Fig. 6.1 shows that the dissolution of gold and silver was significantly determined by bromine concentration. As the bromine concentration increases, the gold dissolution after the 10 hour leaching increases. Other than providing a sufficient amount of bromide ions and bromine, the high concentration of bromine also assures the high potential of the solution throughout the leaching trial, further resulting in high gold extraction. However, the initial gold dissolution at the bromine concentration of 0.58M is higher than that at 0.78M Br2, which is not in accordance with the 40-minute leaching trial shown in Chapter 7. By calculating the mass balance of the 10-hour leaching experiment at 0.58M Br2, it is shown in Table F1 (Appendix F) that the total gold concentration is much lower than the average gold content shown in Table 4.1. The lower gold content calculated by the mass balance could be explained by the heterogeneity of waste printed circuit boards; however, it is most likely attributed to the shortage of bromine, which further results in the lower solution potential as confirmed by ORP (Oxidation Reduction Potential) values. Basically, at the beginning of leaching, gold reacted with bromine to form gold-bromine complexes. As the leaching proceeded, copper did not only react with bromine, but also acted as a reactant which reduced the gold-bromine complex (AuBr4- or AuBr2-) to gold metal. Furthermore, the gold penetrated through the filter paper and was lost during the filtration due to its extremely small particle size. Thus, assuming that the total gold content is approximately 120ppm, the initial 67PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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