Electrolysis expansion performance of semigraphitic cathode in [K3AlF6/Na3AlF6]-AlF3-Al2O3 bath system |
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Authors: | Jie Li Zhao Fang Yan-qing Lai Xiao-jun Lü and Zhong-liang Tian |
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Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China |
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Abstract: | The electrolysis expansion of semigraphitic cathode in K3AlF6/Na3AlF6]-AlF3-Al2O3 bath system was tested by self-made modified Rapoport apparatus. A mathematical model was introduced to discuss the effects
of α
CR (cryolite ratio) and β
KR (elpasolite content divided by the total amount of elpasolite and sodium cryolite) on performance of cathode electrolysis
expansion. The results show that K and Na (potassium and sodium) penetrate into the cathode together and have an obvious influence
on the performance of cathode electrolysis expansion. The electrolysis expansion and K/Na penetration rate increase with the
increase of α
CR. When α
CR=1.9 and β
KR=0.5, the electrolysis expansion is the highest, which is 3.95%; and when α
CR=1.4 and β
KR=0.1, the electrolysis expansion is the lowest, which is 1.28%. But the effect of β
KR is correlative with α
CR. When α
CR=1.6 and 1.9, with the increase of β
KR, the electrolysis expansion and K/Na penetration rate increase. However, when α
CR=1.4, the electrolysis expansion and K/Na penetration rate firstly increase and then decrease with the increase of β
KR.
Foundation item: Project (2005CB623703) supported by the Major State Basic Research and Development Program of China; Project (2008AA030502)
supported by the National High-Tech Research and Development Program of China |
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Keywords: | aluminum electrolysis semigraphitic cathode low temperature electrolysis electrolysis expansion K penetration Na penetration |
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