|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Reduction Technology
||The Influence of Potassium Additive on Cryolite Molten Salt Structure and Transport Properties.
||Hongliang Zhang, Tianshuang Li, Jie Li, Kena Sun, Fengqi Ding, Zhong Zou
|On-Site Speaker (Planned)
In aluminum industry, the potassium is often used as an additive to lower the electrolysis temperature. However, the species (KF and K<SUB>3</SUB>AlF<SUB>6</SUB>) and concentration of potassium compound have influence on alumina solubility in electrolyte. To study this influence, molecular dynamics (MD) simulations and first-principle calculation were carried out. The comparison of high temperature Raman spectrums obtained by First-Principle calculation and experimental analysis was conducted to prove the MD simulation was corrected. The Radial Distribution Function (RDF) of all ions pairs, Al-F complex concentration and the mean square displacement (MSD) were calculated to illustrate the function mechanism. The result shows that potassium compound lower the liquidus temperature by changing Al-F coordinated mode and molten salt structure. The complexing with alumina is also changed which leads to the alumina solubility decreasing. The aims of this paper is to provide theoretical guidance for K3AlF6 industrial application in aluminum electrolysis.
||Planned: Light Metals