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Researchers have conducted a study to determine the feasibility of separating magnesium (Mg) from aluminum-magnesium (Al-Mg) alloy through the calculation of saturated vapor pressures of various metallic substances. The investigation revealed that the vapor pressure of Mg is significantly higher than that of Al, making it easier to separate Mg from the alloy at lower temperatures. The study also examined the dynamics of maximum volatilization rates of Al and Mg, showing that Mg evaporates at a much faster rate than Al, especially at higher distillation temperatures.
To further assess the efficiency of the vacuum distillation (VD) process for separating Mg from Al, the study predicted activity coefficients of the constituents within the alloy using various models. The Non-Random Two-Liquid (NRTL) model was found to be the most accurate in predicting these coefficients, indicating the reciprocal suppression between Al and Mg during the VD process. The results demonstrated that VD can effectively separate Mg from Al, leading to the purification of high-purity Al.
Additionally, Vapor-Liquid Equilibrium (VLE) diagrams were utilized to visually represent the separation process of Mg from Al in the alloy. The diagrams showed that even a small amount of Mg in the liquid phase can almost entirely evaporate into the gas phase, leading to high levels of Mg concentration in the vapor phase. The accurate prediction of VLE diagrams further validated the effectiveness of the VD process in separating Mg from Al-Mg alloys to obtain purified aluminum.
Overall, the study provides valuable insights into the thermodynamic properties of Al-Mg alloys and offers a scientific basis for the efficient separation and purification of metals through the VD process.
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Photo credit www.nature.com
