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can be recovered in the sink, while gold has a poor recovery. Interestingly, there is a dramatic decrease in the recovery of aluminum and iron in the presence of 5Χ10-3 and 10-2 M Na2S. However, generally, the addition of Na2S has no significant effect on selective separation of the metallic elements of interest. Since there is no selectivity using Frother 70, an attempt was made to investigate the effect of various frothers due to their different chemical compositions. The following tests were performed at pH 10 to aim at determining whether or not any frothers could be successfully selective. From Fig. 5.10, it can be seen that all of the frothers show no selectivity with respect to the desirable metals and non-metallic materials. The silver and gold recoveries slightly increase in the Frother 65 and F-549 systems, respectively, but no element’s recovery was strongly affected. 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 pH Al Cu Ag Au Figure 5.8 Metal distribution in sinks with various pH in the presence of Frother 70 The effect of ammonium lignin sulfonate is displayed in Fig. 5.11. Gold shows a reduced recovery in all the systems, although it has the least negative effect in the Frother 70 system. However, copper, silver, iron and aluminum show increased recovery in three systems, although it has the most positive effect in the Frother 70 system. The ammonium lignin sulfonate behaviors 60 Metal distribution in sinks (%)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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