Research Article
Kinetic Analysis of Aluminum Extraction from Ethiopian Kaolinite Using Hydrochloric Acid
Table 3
The regression correlation coefficients and rate constants for extraction of aluminum at various reaction temperatures from 50 to 80°C.
| | Model | Rate equation | The regression correlation coefficients and rate constants (ki) at various reaction temperatures from 50 to 80°C | | 50°C | 60°C | 70°C | 80°C | | R2 | ki | R2 | ki | R2 | ki | R2 | ki |
| | Shrinking core | | 0.991 | 1.23 × 10−3 | 0.984 | 1.74 × 10−3 | 0.993 | 2.02 × 10−3 | 0.994 | 2.86 × 10−3 | | 0.971 | 1.77 × 10−3 | 0.964 | 2.61 × 10−3 | 0.972 | 2.95 × 10−3 | 0.963 | 3.64 × 10−3 | | 0.972 | 9.86 × 10−4 | 0.974 | 1.82 × 10−3 | 0.971 | 2.27 × 10−3 | 0.964 | 3.74 × 10−3 | | Pseudohomogeneous | | 0.963 | 4.27 × 10−3 | 0.961 | 6.79 × 10−3 | 0.954 | 7.94 × 10−3 | 0.953 | 1.39 × 10−2 | | 0.973 | 7.47 × 10−3 | 0.971 | 1.58 × 10−2 | 0.943 | 2.30 × 10−2 | 0.843 | 7.23 × 10−2 | | Avrami | | 0.972 | 2.90 × 10−2 | 0.970 | 2.99 × 10−2 | 0.963 | 3.21 × 10−2 | 0.942 | 3.27 × 10−2 | | Model parameter (n) | 0.634 | | 0.723 | | 0.742 | | 0.820 | |
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