Effect of NaCl and LiF on current efficiency of low temperature aluminum electrolysis
Low temperature aluminum electrolysis is an important research area for energy saving in aluminum electrolysis technology.The composition of the molten salt has a significant effect on the electrolysis temperature and current efficiency.In order to obtain the optimal low-temperature molten salt systems,NaCl and LiF have been added to the NaF-AlF3-CaF2-Al2 O3 molten salt systems,and the electrolysis has been conducted at 840～880℃for 4 h.The influences of additive and alumina mass fraction on the current efficiency have been analyzed.The results show that when 10％ ( mass fraction,the same as below) NaCl is added the current efficiency is 72.5％,which is 16.4％ higher than that of the traditional NaF-AlF3-CaF2-Al2 O3 molten salt system.When 2.5％NaCl-7.5％LiF,5％NaCl-5％LiF,and 7.5％NaCl-2.5％LiF are added,the current efficiency is approximately 68％.When 10％LiF is added,the current efficiency is 57.8％.When the mass fraction of Al2 O3 is 2％,the current efficiency during NaF-AlF3-5％CaF2-10％NaCl-5％LiF molten salt systems electrolysis for 2 h is 48.1％,which is 5.2％ higher than that of the Al2 O3 with the mass fraction of 3％.
low temperature aluminum electrolysiscurrent efficiencyNaClLiF
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