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Fig. 9—Plot of 1 — 2(1 — x)'7 + (1 — x)?" vs ¢ for different agitation speeds.

Figure 9 —Plot of 1 — 2(1 — x)'7 + (1 — x)?" vs ¢ for different agitation speeds.

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Fig. 1—X-ray diffraction pattern for oxidized copper (malachite) ore used in the study. The leaching experiments were carried out in a 750- mL cylindrical glass reactor equipped with a mechanical agitator, a reaction temperature control unit, and a condenser to avoid loss of solution from evaporation. The experimental procedure was initiated by adding 500 mL of an ammonium nitrate solution into the glass reactor and bringing it to the desired reaction temper- ature. A given amount of solid sample was then added to the solution. The dissolution process was carried out for various reaction times. Aliquots of 5 mL were withdrawn at regular intervals during the reaction and were immediately filtered. The amount of dissolved copper in the solution was determined complexometri- cally using ethylenediaminetetraacetic acid solution as
Fig. 1—X-ray diffraction pattern for oxidized copper (malachite) ore used in the study. The leaching experiments were carried out in a 750- mL cylindrical glass reactor equipped with a mechanical agitator, a reaction temperature control unit, and a condenser to avoid loss of solution from evaporation. The experimental procedure was initiated by adding 500 mL of an ammonium nitrate solution into the glass reactor and bringing it to the desired reaction temper- ature. A given amount of solid sample was then added to the solution. The dissolution process was carried out for various reaction times. Aliquots of 5 mL were withdrawn at regular intervals during the reaction and were immediately filtered. The amount of dissolved copper in the solution was determined complexometri- cally using ethylenediaminetetraacetic acid solution as
Table I. Chemical Analysis of Malachite Ore Used in the Study Table If. Leaching Parameters and the Ranges Used in the Leaching Experiments
Table I. Chemical Analysis of Malachite Ore Used in the Study Table If. Leaching Parameters and the Ranges Used in the Leaching Experiments
*These parameters were kept constant.
*These parameters were kept constant.
Fig. 3—Effect of particle size on leaching of malachite ore. Fig. 2—Effect of ammonium nitrate concentration on leaching of malachite ore.
Fig. 3—Effect of particle size on leaching of malachite ore. Fig. 2—Effect of ammonium nitrate concentration on leaching of malachite ore.
200, 300, 400, and 500 rpm while the values of the solution concentration, reaction temperature, solid-to- liquid ratio, and particle size were kept constant at 4 mol/L, 313 K (40 °C), 2 g solid/0.5 L solution, and 62.4 um, respectively. The results are given in Figure 4. After 150 minutes of leaching, the extent of leaching of copper from the ore increased from 72 pct to 89.8 pct when the agitation speed increased from 200 to 500 rpm. The experimental findings indicate that the agitation speed is a major factor in the leaching of the malachite ore.
200, 300, 400, and 500 rpm while the values of the solution concentration, reaction temperature, solid-to- liquid ratio, and particle size were kept constant at 4 mol/L, 313 K (40 °C), 2 g solid/0.5 L solution, and 62.4 um, respectively. The results are given in Figure 4. After 150 minutes of leaching, the extent of leaching of copper from the ore increased from 72 pct to 89.8 pct when the agitation speed increased from 200 to 500 rpm. The experimental findings indicate that the agitation speed is a major factor in the leaching of the malachite ore.
Fig. 4—Effect of agitation speed on leaching of malachite ore. The leaching reaction of mineral particles by a reagent (a solid-fluid reaction) can be represented by the following reaction:
Fig. 4—Effect of agitation speed on leaching of malachite ore. The leaching reaction of mineral particles by a reagent (a solid-fluid reaction) can be represented by the following reaction:
Fig. 5—Effect of reaction temperature on leaching of malachite ore.
Fig. 5—Effect of reaction temperature on leaching of malachite ore.
lable II. The Apparent Rate Constants, A,, k,, and kg for Kinetic Models and Correlation Coefficient Values
lable II. The Apparent Rate Constants, A,, k,, and kg for Kinetic Models and Correlation Coefficient Values
Fig. 8—Plot of 1 — 2(1 — x)'3 + (1 — x)?? vs ¢ for different particle sizes. : Combining Eqs. [12] and [13], the following equation is obtained:
Fig. 8—Plot of 1 — 2(1 — x)'3 + (1 — x)?? vs ¢ for different particle sizes. : Combining Eqs. [12] and [13], the following equation is obtained:
Fig. 10—Plot of 1 — 2(1 — x)'7_ + (1 — x)*? ys ¢ for different temper- atures.
Fig. 10—Plot of 1 — 2(1 — x)'7_ + (1 — x)*? ys ¢ for different temper- atures.
Table IV. The Apparent Rate Constant, k,,, for Mixed Kinetic Model and Correlation Coefficient Values
Table IV. The Apparent Rate Constant, k,,, for Mixed Kinetic Model and Correlation Coefficient Values
Fig. 12—X-ray diffraction pattern of the solid residue resulting from leaching of malachite ore. In this study, the leaching kinetics of malachite ore was studied using ammonium nitrate solutions as the lixiviant. The effects of several experimental parameters
Fig. 12—X-ray diffraction pattern of the solid residue resulting from leaching of malachite ore. In this study, the leaching kinetics of malachite ore was studied using ammonium nitrate solutions as the lixiviant. The effects of several experimental parameters
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