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7.2.5 Effect of Temperature The effect of temperature was conducted at two temperatures, 23.5 and 42 °C (Fig. 7.5), given that the boiling point of liquid bromine was around 58.8 °C. The leaching parameters were 0.78M Br2, 0.58M NaBr, 1/20 g/mL pulp density, and 400 RPM. It was found that the gold dissolution was highly dependent on temperature. The Arrhenius Plot (Fig. 7.6) showed that the activation energy was 26.57 KJ/mole (6.35 Kcal/moles). Therefore, by taking 26,570 J/mole for the activity energy, the Eq. 7.7 can be rewritten as follows: r = 0.215∙EXP(-26570/RT) ∙ CBr20.55 ∙ CNaBr0.16 ∙ CCu-0.41 (7.9) 7.2.6 Effect of Agitation Speed The effect of the agitation speed on gold dissolution was studied in the presence of 0.78M Br2 and 0.58M NaBr at 23.5 °C and natural pH. Three agitation speeds were studied, 200, 300 and 400 RPM. As shown in Fig. 7.7, increasing the agitation speed from 200 to 300 RPM accelerated the initial gold dissolution, which could be explained by the fact that mass transfer controlled the gold dissolution in the lower range of agitation speed, 200 to 300 RPM. Beyond the agitation speed of 300 RPM, agitation speed had a slightly positive effect on gold dissolution, which could be attributed by minimization of mass transfer control in the higher agitation speed. 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 296.7 K 315.2 K 0 10 20 30 40 50 Leaching time (minute) Figure 7.5 Effect of temperature on gold dissolution at 0.78M Br2, 0.58M NaBr and 400 RPM 95 Gold dissolved (ppm)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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