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A novel recycling process was developed to produce vanadium aluminum (AlV55) alloy using vanadium aluminum (AlV65) alloy scrap and aluminum (Al) under vacuum. The theoretical calculation indicates that Al can be evaporated under vacuum. Excessive Al would be consumed during melting process when the reaction temperature ranges from 1823 to 2123 K, according to the theoretical calculation, which indicates...
The removal of phosphorus impurities is among the most important problems in the purification of upgraded metallurgical-grade silicon (UMG-Si) used in the preparation of solar-grade silicon (SOG-Si). Vacuum refining is considered relatively effective for removing phosphorus from molten silicon. Based on the saturated vapor pressure of phosphorus calculated, the removal of phosphorus from UMG-Si at...
In this paper, the activity coefficients of calcium in SiCa binary and SiCaPb ternary alloys were each calculated by the molecular interaction volume model (MIVM). The value of the infinite dilution activity coefficient of calcium was determined to be 0.000863 in the SiCa binary alloy at 1723 K. The activities of silicon and lead in the SiPb binary alloy and of calcium and lead in the CaPb binary...
Ab-initio molecular dynamics simulations are performed to study the structural and electronic properties of liquid Pb–Sb alloys at eight concentrations. This alloy is known as azeotropic compounds within a certain ingredients at different temperature. The separation of Pb–Sb alloys is experimental carried out by vacuum distillation at 1173 K. Our predictions are coincident with the available experimental...
The vacuum volatilization of aluminum from silicon melt is studied by the molecular interaction volume model (MIVM) in this paper. The activities and activity coefficients of components in the Si–Al binary melt were investigated based on the MIVM and the results show that the predicted values of activities are in good agreement with the experimental data. The infinite dilution activity coefficients...
A new route for degassing of molten aluminum alloys has been developed via the electromagnetic directional solidification. We evaluated the degassing feasibility and mechanism for the formation and evolution of the porosity. As expected, it enabled the migration of porosity to the upper end instead of the distribution in the whole sample. Furthermore, we investigated the effects of various pull-down...
The chlorination-disproportionation of Al 4 O 4 C and Al 4 C 3 in vacuum was investigated by thermodynamic analysis and experiments using the side products of the AlCl disproportionation process of alumina, consisting of Al 4 O 4 C, Al 4 C 3 , Al 2 O 3 and C, as raw materials. It was demonstrated that the chlorinations...
In this paper, the molecular interaction volume model (MIVM) has been used for a calculation of the activities of components of Pb–Sn–Sb ternary alloy system. The separation coefficients of the related binary alloys Sn–Pb and Sn–Sb and the vapor–liquid phase equilibrium of the Pb–Sn–Sb alloy system were also calculated by using the MIVM. Experiments for the separation of the Pb–Sn–Sb ternary alloy...
Characteristics and synthesis mechanism of Gd 2 O 2 S:Tb phosphors prepared by vacuum firing were investigated by photoluminescence (PL) spectra, X-ray diffraction (XRD), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM). The mixtures of raw materials were tested by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The firing...
The quantity of silicon lost during evaporation is greater than theoretical expectation during the purification of metallurgical grade silicon by vacuum evaporation. In this paper, silicon volatilization rates were measured for evaporation times of 30, 45 and 60 min at 1723, 1773 and 1823 K, respectively. Results indicate that volatilization rates determined in our experiments are one or two orders...
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