The current study focuses on the electrolyte penetration of the graphite cathode in a NaF−KF−LiF−AlF_(3) aluminum-electrolysis system with a cryolite ratio of 1.3.It involves a comprehensive investigation of the elect...The current study focuses on the electrolyte penetration of the graphite cathode in a NaF−KF−LiF−AlF_(3) aluminum-electrolysis system with a cryolite ratio of 1.3.It involves a comprehensive investigation of the electrolyte in the cathode before and after electrolysis by X-ray diffraction and analysis of the results by semi-quantitative calculation in MAUD.The results show that KF can promote electrolyte penetration,with higher KF contents resulting in greater penetration.During electrolyte penetration,K_(2)NaAlF_(6) and solid solutions containing KF play important roles in KF-containing systems.LiF effectively prevents the electrolyte penetration,while the Na_(3)Li_(3)Al_(2)F_(12) phase plays an essential role in systems with high LiF contents.展开更多
The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysis were determined by EMF with Naβ-Al_2O_3 solid electrolyte.With this sodium activities,we calculate the activities o...The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysis were determined by EMF with Naβ-Al_2O_3 solid electrolyte.With this sodium activities,we calculate the activities of NaF and AIF_3 in the cryolite-alumina melt.The potential difference of discharge be- tween sodium ions and aluminum ions at cathode of Hall-Heroult cell was also obtained from the sodium activity in aluminum.展开更多
基金financial supports from the National Natural Science Foundation of China (Nos.51774080,22078056)the National Key R&D Program of China (No.2018YFC1901905)。
文摘The current study focuses on the electrolyte penetration of the graphite cathode in a NaF−KF−LiF−AlF_(3) aluminum-electrolysis system with a cryolite ratio of 1.3.It involves a comprehensive investigation of the electrolyte in the cathode before and after electrolysis by X-ray diffraction and analysis of the results by semi-quantitative calculation in MAUD.The results show that KF can promote electrolyte penetration,with higher KF contents resulting in greater penetration.During electrolyte penetration,K_(2)NaAlF_(6) and solid solutions containing KF play important roles in KF-containing systems.LiF effectively prevents the electrolyte penetration,while the Na_(3)Li_(3)Al_(2)F_(12) phase plays an essential role in systems with high LiF contents.
文摘The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysis were determined by EMF with Naβ-Al_2O_3 solid electrolyte.With this sodium activities,we calculate the activities of NaF and AIF_3 in the cryolite-alumina melt.The potential difference of discharge be- tween sodium ions and aluminum ions at cathode of Hall-Heroult cell was also obtained from the sodium activity in aluminum.
