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gold dissolution rate at 0.58M Br2 would be consistent with the data from the 40-minute leaching trials. Although the high usage of bromine could possibly dissolve approximately 92% gold, the high consumption of bromine limits the practical feasibility. 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 Au at 0.58M Br2 Au at 0.78M Br2 Au at 0.97M Br2 Au at 1.16M Br2 Au at 1.55M Br2 Ag at 0.58M Br2 Ag at 0.78M Br2 Ag at 0.97M Br2 Ag at 1.16M Br2 Ag at 1.55M Br2 0 2 4 6 8 10 12 Time (hr) Figure 6.2 Dissolution of gold and silver at various concentrations of liquid bromine (23.5 °C and natural pH) In terms of silver, it appears that the increasing bromine concentration accelerates the initial silver dissolution rate, until a certain concentration limit (0.97M Br2) is reached, beyond which bromine has no further effect. However, it is worthwhile to point out that when the bromine concentration is within the range of 0.97M and 1.16M, the dissolved silver content first increases, and then decreases, as the leaching proceeds. It could be explained by the solubility of silver bromide. Initially, due to the high content of bromine, silver is dissolved to silver-bromide complexes shown in Fig. 6.3. However, as the leaching continues, the bromide content becomes less and less, further resulting in the decreasing content of bromide ions. As shown in Fig. 6.3, silver bromide is likely to be precipitated as AgBr(s), which could explain the decreasing trend for the silver content. At the highest concentration of bromine, bromine is excessive; therefore, silver is always soluble in the solution as silver-bromide complexes, leading to an increasing trend of 68 Au dissolved (%) Ag dissolved (%)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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