Effect of Temperature on Solubility of WO3 in the NaCl-KCl-NaF-WO3 Molten Salt

2014 ◽  
Vol 908 ◽  
pp. 171-174
Author(s):  
Jie Li ◽  
Yang Pei ◽  
Yun Gang Li
Keyword(s):  
Molten Salt ◽  
Salt System ◽  
Effect Of Temperature ◽  
Chemical Dissolution ◽  
Xrd Pattern ◽  
Isothermal Saturation ◽  
Saturation Method ◽  
Molten Salt System ◽  
The Relationship

The solubility of WO3 in NaCl-KCl-NaF-WO3 molten salt system was measured by isothermal saturation method. The results show that in the molten salt system the solubility of WO3 increased with the increase of temperature from 700 °C to 820 °C, and the relationship between solubility and temperature is approximately linear. As shown in the XRD pattern, there are NaCl, KCl, NaF, WO3, Na5W3O9F5, Na3WO3F3 and NaWO3F in the molten salt, so the dissolution of WO3 is the result of both physical dissolution and chemical dissolution.

Study of Solubility of WO3 in the NaCl-KCl-NaF-WO3 Molten Salt

2014 ◽  
Vol 908 ◽  
pp. 167-170 ◽  
Author(s):  
Jie Li ◽  
Yang Pei ◽  
Yun Gang Li
Keyword(s):  
Molten Salt ◽  
Temperature Rise ◽  
Salt System ◽  
Dissolution Time ◽  
Xrd Pattern ◽  
Saturation Time ◽  
Isothermal Saturation ◽  
Saturation Method ◽  
Molten Salt System

The solubility of WO3 in NaCl-KCl-NaF-WO3 molten salt system was measured by isothermal saturation method. The results show that in the molten salt system when the temperature rise to 700 °C the saturation time of the WO3 dissolution time is 6 hours. When the temperature rise to 730 °C from 700 °C the saturation time of the WO3 dissolution time needs 80 minutes. As shown in the XRD pattern, there are NaCl, KCl, NaF, WO3, Na5W3O9F5, Na3WO3F3 and NaWO3F in the molten salt.

Solubility of ZrO2 in Cryolite-Based Molten Salt System

2014 ◽  
Vol 968 ◽  
pp. 67-71 ◽  
Author(s):  
Morigen Gaowa Bao ◽  
Zhao Wen Wang ◽  
Bing Liang Gao ◽  
Zhong Ning Shi ◽  
Xian Wei Hu ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Molten Salt ◽  
Important Method ◽  
Initial Stage ◽  
Increase Rate ◽  
Different Temperatures ◽  
Isothermal Saturation ◽  
Saturation Method ◽  
Molten Salt System ◽  
Zr Alloy

Electrolysis of cryolite-based molten salt is an important method for Al-Zr alloy production. The dissolution of ZrO2 in the melts effects current efficiency and energy consumption of the production process of Al-Zr alloy, so it is most importance to study the solubility of ZrO2 in the melts. In this paper, the solubility of ZrO2 in the cryolite-based molten salt of different composition at different temperatures was measured by isothermal saturation method. It was found that ZrO2 content increased rapidly in the initial stage, but the increase rate was very slow after two hours, so it was thought that ZrO2 was nearly saturation after two hour-after dissolution. The solubility of ZrO2 in cryolite-based molten salt increased markedly when increased the temperature and addition of CaF2. The solubility of ZrO2 in 2.2NaF·AlF3-Al2O3-CaF2 molten salt is similar with solubility of ZrO2 in the 2.2NaF·AlF3-CaF2, it is reach 5.5wt%.

Molecular Dynamics Simulation Study of the Effect of Ni, Fe, Cu on Cryolite Molten Salt System 78% Na3AlF6-9.5%AlF3-5.0%CaF2-7.5%-Al2O3

2021 ◽  
Vol 1026 ◽  
pp. 39-48
Author(s):  
Han Bing He ◽  
Yu Si Wang ◽  
Ze Xiang Luo ◽  
Jing Zeng
Keyword(s):  
Molecular Dynamics ◽  
Diffusion Coefficient ◽  
Molten Salt ◽  
Diffusion Mechanism ◽  
Research Work ◽  
Dynamics Simulation ◽  
Salt System ◽  
Electrolyte System ◽  
Aluminum Composite ◽  
Molten Salt System

The effect of different additives Ni, Fe, Cu on the structure and properties of electrolyte system 78% Na3AlF6- -9.5%AlF3-5.0%CaF2-7.5%Al2O3 at 1200K and 1.01Mpa was studied by molecular dynamics method. The radial distribution function, coordination number, diffusion coefficient, conductivity, and viscosity of the system were discussed in detail. The results demonstrated that the order of the self-diffusion coefficient of ions in the electrolyte system is: Na+ > F- > O2- > Ca2+ >Al3+. The addition of Ni and Fe connected the free aluminum composite ion groups in the system through fluorine bridges, which enhanced the interaction between Al3+ and Al3+. The addition of Cu weakened the interaction between Al3 + and Al3+ and the F-. The interaction between Al3+ and Na+, [AlF7]4- ionic groups might appeared in the melt system. After adding NiO, Fe2O3, and Cu, the electrical conductivity of the system increased, and the viscosity decreased. The research work revealed the influence of Ni, Fe, Cu on the ion existence form, mobility, inter-ion interaction and diffusion mechanism of cryolite molten salt system, which has important guiding significance for aluminum electrolysis production.

First-principles molecular dynamics investigation on KF-NaF-AlF3 molten salt system

2019 ◽  
Vol 730 ◽  
pp. 587-593 ◽  
Author(s):  
Hui Guo ◽  
Jie Li ◽  
Hongliang Zhang ◽  
Tianshuang Li ◽  
Jiawei Luo ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molten Salt ◽  
First Principles ◽  
Salt System ◽  
Molten Salt System ◽  
First Principles Molecular Dynamics

Effect of Na3WO3F3 Content on the Liquidus Temperature of NaCl-KCl-Na3WO3F3 Molten Salt System

2014 ◽  
Vol 908 ◽  
pp. 159-162
Author(s):  
Jie Li ◽  
Yang Pei ◽  
Ya Bin Liu ◽  
Yun Gang Li
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Molten Salt ◽  
Liquidus Temperature ◽  
Eutectic Composition ◽  
Eutectic Temperature ◽  
Salt System ◽  
Molten Salt System

The liquidus temperature of molten salt NaCl-KCl-Na3WO3F3 system was measured by differential thermal analysis. The results show that in the molten salt system when XNaCl:XKCl=1:1, XNa3WO3F3<0.6 the liquidus temperature decreased with increase of Na3WO3F3 content; when XNaCl:XKCl=1:1, XNa3WO3F3> 0.6 the liquidus temperature increased with the increase of Na3WO3F3 content; the eutectic temperature is 612.9 °C, the eutectic composition is XNaCl=0.2, XKCl=0.2, XNa3WO3F3=0.6.

Sign in / Sign up

Export Citation Format

Share Document