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resources, including oxides, sulfides, silicates, phosphates, and a number of others (Gupta et al., 1990). Pesic et al. (1993) studied the effect of sulfuric acid on gold dissolution and found that the presence of sulfuric acid had no effect on dissolving pure gold in a bromine-bromide leaching system (Pesic et al., 1993). Therefore, a study was performed in the presence of two concentrations (5 and 15 v/v%) of sulfuric acid under the condition of 0.77M Br2, 1.17M NaBr and 23.5 °C, as well as 400RPM. During this study, pH was not controlled. Table 6.1 shows a summary of the experimental data. It indicates that the increase of H2SO4 concentration significantly decreases the gold dissolution. It is probably because barium reacts with sulfuric acid to produce a precipitate, barium sulfate, which is insoluble. The insoluble barium sulfate is likely to coat the surface of gold particles, preventing the further reaction between bromine and gold. By calculating the mass balance of the experiment in the presence of 15% sulfuric acid (Table F11), it is found that there is a significant decrease of the total silver content. It can be explained by the fact that neither aqua regia or hydrofluoric acid are capable of dissolving silver sulfate, resulting in a lower silver content for the leaching residue. Table 6.1 Summary of leaching experiment in the presence of 5 and 15 v/v% H2SO4 15 v/v% H2SO4 Extraction (%) 93.37 96.57 91.72 99.18 91.55 84.80 71.35 Metal Ni 95.78 5 v/v% H2SO4 Extraction (%) Cu 97.56 Zn 97.22 Sn 98.54 Pd 88.74 Ag 96.98 Au 91.02 In order to investigate the effect of various mineral acids, a series of 10-hour leaching trials was conducted under the condition of 0.77M Br2, 1.17M NaBr and 23.5 °C, as well as 400RPM. Hydrochloric acid, nitric acid and sulfuric acid were chosen and diluted to a concentration of 5 v/v%. Fig. 6.12, 6.13 and 6.14 present the leaching data for the three mineral acids, and the full analysis is presented in Table F10, F12 and F13. The results show that the presence of the three 76PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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