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Figure 9. Arrhenius plot in accordance with the initial reaction rates from Figure 6. model given in Figure 8 shows that the model is quite acceptable for this system.

Figure 9 Arrhenius plot in accordance with the initial reaction rates from Figure 6. model given in Figure 8 shows that the model is quite acceptable for this system.

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The dissolution kinetics of an oxidized copper ore, primarily malachite, in water saturated with chlorine and in H2SOs, solutions was studied.!?-!3 A kinetic model of the dissolution of copper(II) oxide in EDTA solutions was proposed, and the effects of pH and the EDTA concentration was investigated in the experiments.!* Table 1. Wet Chemical Analysis of the Ore Used in the Study
The dissolution kinetics of an oxidized copper ore, primarily malachite, in water saturated with chlorine and in H2SOs, solutions was studied.!?-!3 A kinetic model of the dissolution of copper(II) oxide in EDTA solutions was proposed, and the effects of pH and the EDTA concentration was investigated in the experiments.!* Table 1. Wet Chemical Analysis of the Ore Used in the Study
Figure 2. Solubility of NH3 in water as a function of temperature at 610 mmHg. Figure 1. X-ray diffractogram of malachite ore.
Figure 2. Solubility of NH3 in water as a function of temperature at 610 mmHg. Figure 1. X-ray diffractogram of malachite ore.
Figure 3. Effect of malachite particle size on the leaching rate in water saturated with NHs3 gas (T = 45 °C, C = 7.68 mol-L“1, S/L = 2/100 g-mL“!, SS = 400 rpm).
Figure 3. Effect of malachite particle size on the leaching rate in water saturated with NHs3 gas (T = 45 °C, C = 7.68 mol-L“1, S/L = 2/100 g-mL“!, SS = 400 rpm).
Figure 4. Effect of ammonia concentration on the leaching rate of malachite in water saturated with an NH3—Ne gas mixture (D = +1180-—1400 wm, T = 45 °C, S/L = 2/100 g-mL“, SS = 400 rpm)
Figure 4. Effect of ammonia concentration on the leaching rate of malachite in water saturated with an NH3—Ne gas mixture (D = +1180-—1400 wm, T = 45 °C, S/L = 2/100 g-mL“, SS = 400 rpm)
Figure 6. Effect of temperature on the leaching rate of malachite in water saturated with NH3 gas (D = +1180—1400 um, C = 7.68 mol-L~1, S/L = 2/100 g-mL~!, SS = 400 rpm). Figure 5. Effect of solid-to-liquid ratio on the leaching rate of malachite in water saturated with NH3 gas (D = +1180—1400 um, T = 45 °C, C = 7.68 mol-L“!, SS = 400 rpm).
Figure 6. Effect of temperature on the leaching rate of malachite in water saturated with NH3 gas (D = +1180—1400 um, C = 7.68 mol-L~1, S/L = 2/100 g-mL~!, SS = 400 rpm). Figure 5. Effect of solid-to-liquid ratio on the leaching rate of malachite in water saturated with NH3 gas (D = +1180—1400 um, T = 45 °C, C = 7.68 mol-L“!, SS = 400 rpm).
Figure 7. Effect of stirring speed on the leaching rate of malachite in water saturated with NH3 gas (D = +1180—1400 um, T = 45 °C, C = 7.68 mol-L“!, S/L = 2/100 g-mL~}).
Figure 7. Effect of stirring speed on the leaching rate of malachite in water saturated with NH3 gas (D = +1180—1400 um, T = 45 °C, C = 7.68 mol-L“!, S/L = 2/100 g-mL~}).
Figure 8. Comparison of mathematical model with experimental data. example, if the reaction rate conforms with a pseudo- first-order model, the rate equation is
Figure 8. Comparison of mathematical model with experimental data. example, if the reaction rate conforms with a pseudo- first-order model, the rate equation is
where Ax is the 3% leaching amount and At is the time required for 3% leaching. The ammonia concentration in the aqueous solution changes with temperature. To eliminate the effect of this change on the leaching rate constant, k, eq 18 was written From the plot of In k versus 1/T constructed by eq 21 taking into account, the activation energy was found to be 85.16 kJ-mol~! and the Arrhenius constant, k,, to be 8.23 x 101°. This value of the activation energy was the same as that found statistically.
where Ax is the 3% leaching amount and At is the time required for 3% leaching. The ammonia concentration in the aqueous solution changes with temperature. To eliminate the effect of this change on the leaching rate constant, k, eq 18 was written From the plot of In k versus 1/T constructed by eq 21 taking into account, the activation energy was found to be 85.16 kJ-mol~! and the Arrhenius constant, k,, to be 8.23 x 101°. This value of the activation energy was the same as that found statistically.
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