| Abstract |
| In order to determine the influences of temperature on the recovery and precipitation of Lanthanum, a Pourbaix diagram was constructed using thermodynamic calculations for 283 K, 298 K, 313 K, and 328 K. In terms of the reduction potential of La3+, when {La3+} is 100, the potential increases from -2.381 V to - 2.369 V as the temperature increases from 283 K to 328 K, but when {La3+} is 10-6, it decreases from - 2.493 V to -2.500 V. The pH of precipitation of La(OH)3 decreases as the temperature rises. The pH decreases from 7.58 to 6.25 and from 9.58 to 8.25 when {La3+} is 100 and 10-6, respectively. Based on these changes in the potential and pH, it is considered that the pH has a greater effect on the stable area of La3+ than dose the reduction potential of La3+. Overall, with an increase in temperature, the stable area of La3+ decreases while that of La(OH)3 increases. When {La3+} is 10-6, as the temperature rises, the stable area of La3+ decreases to 95.0%, 90.4%, and 86.3% of the area at 283 K. However, as the temperature decreases, the stable area of La(OH)3 falls to 92.6%, 84.5%, and 75.7% of the stable area at 328 K. This means that an increase in temperature can reduce the efficiency of the recovery and precipitation process of La3+ while increasing the efficiency of the precipitate treatment of La(OH)3. |
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| Key Words |
| Lanthanum, La(OH)3, Pourbaix diagram, Rare Earth Elements, Stable area, 란타늄, Pourbaix 다이어그램, 희토류, 안정영역 |
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