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suggest that it acts as a stronger depressant for copper, iron, silver and aluminum in the same manner in each system, even though the Frother 70 system appears to be more sensitive to the addition of ammonium lignin sulfonate. Gold is more likely to float with the plastics with respect to the addition of ammonium lignin sulfonate. The increased recovery of copper, silver, iron and aluminum in the sink could be attributed to a lack of frother adsorption. To some extent, the concentration is accomplished, whereas the recovery is not high enough to be satisfied. 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 0.00E+00 2.00E-02 4.00E-02 6.00E-02 8.00E-02 1.00E-01 1.20E-01 Al Fe Cu Ag Au Concentration of Na2S (M) Figure 5.9 Effect of Na2S in the presence of Frother 70 Unlike ammonium lignin sulfonate that is more sensitive to the Frother 70 system, starch (Fig. 5.12) appears to have the strongly positive effect on the recoveries of the desired metals in the Frother 65 system, especially silver and gold. The starch addition to the systems appears to depress most of the metals of interest, based on their increased recoveries in the sink. Interestingly, copper recoveries in the three systems are constant, compared to those without starch. The results show that a selective flotation pre-concentration is difficult. To a certain extent, both ammonium lignin sulfonate and starch have positive effects on the separation. However, the recoveries of the desirable metals are poor. 61 Metal distribution in sinks (%)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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