| Abstract |
| Neodymium, a key rare earth element, is widely used in high-performance permanent magnets for advanced industrial applications. As the use of neodymium-containing materials expands, the discharge of neodymium-bearing wastewater and industrial residues has increased, raising concerns about its behavior and fate in aquatic environments. Dissolved neodymium ions are difficult to recover and may pose environmental risks, underscoring the need for effective treatment and recovery strategies. This study systematically investigates the thermodynamic behavior of neodymium in aqueous systems using Pourbaix (Eh-pH) diagrams under varying temperature conditions. The Nd-H₂O system was modeled by considering Nd(s), Nd³⁺(aq), and Nd(OH)₃(s) as the dominant species. Thermodynamic calculations were conducted at four temperatures using standard Gibbs free energy, enthalpy, and entropy data. The effects of temperature and neodymium ion activity on species stability and precipitation boundaries were evaluated. The results demonstrate that temperature strongly influences the thermodynamic stability fields and precipitation behavior of neodymium in aqueous environments. These findings provide fundamental insights for optimizing pH and temperature conditions in neodymium recovery and treatment processes. |
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| Key Words |
| Neodymium, Pourbaix diagram, Thermodynamic stability, Aqueous system, Temperature effect, 네오디뮴, 푸베다이어그램, 열역학 안정성, 수환경, 온도 변화 |
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