Low-temperature aluminum electrolysis process and electrolyte
A technology of aluminum electrolysis and electrolyte, which is applied in molten salt electrochemical electrolysis and electrochemical fields, and can solve problems affecting the stable operation of electrolytic cells and technical and economic indicators, the increase of the primary crystal temperature of the melt in the cathode area, and the failure of the electrolysis process to proceed normally, etc. , to achieve the effects of reducing energy consumption of aluminum electrolysis, reasonable electrolyte composition, and inhibiting cathode crusting
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Embodiment 1
[0017] Electrolyte melt composition (mass percentage) is 15% K 3 AlF 6 , 61.8% Na 3 AlF 6 , 1.2% Al 2 o 3 , 21% AlF 3 , when 1% LiF is used, the electrolysis temperature used is 910°C, the superheat of the melt is 15°C, the anode effect coefficient is controlled at 0.06 times / cell day, and the anode current density is 0.75A / cm 2 , during the electrolysis process, the initial crystal temperature was tested after sampling the electrolyte at different positions in the electrolytic cell. The problem of cathode crusting caused by the rise of crystal temperature, and the problem of precipitation caused by the drop of alumina dissolution rate can realize the stable operation of the electrolytic cell, the current efficiency can reach 93.2%, and the energy saving and emission reduction are obvious.
Embodiment 2
[0019] Electrolyte melt composition (mass percentage) is 24%K 3 AlF 6 , 45.5% Na 3 AlF 6 , 2.5% Al 2 o 3 , 25% AlF 3 , when 3.0% LiF is used, the electrolysis temperature used is 885°C, the superheat of the melt is 20°C, the anode effect coefficient is controlled at 0.1 times / cell day, and the anode current density is 1.2A / cm 2 , during the electrolysis process, the primary crystal temperature was tested after sampling the electrolyte at different positions in the electrolytic cell. The problem of cathode crusting caused by the rise of crystal temperature, and the problem of precipitation caused by the drop of alumina dissolution rate can realize the stable operation of the electrolytic cell, the current efficiency can reach 92.8%, and the energy saving and emission reduction are obvious.
Embodiment 3
[0021] Electrolyte melt composition (mass percentage) is 20.0% K 3 AlF 6 , 51.0% Na 3 AlF 6 , 2.0% Al 2 o 3 , 23.0% AlF 3 , 4.0% LiF, the electrolysis temperature used is 850°C, the superheat of the melt is 40°C, the anode effect coefficient is controlled at 0.01 times / cell day, and the anode current density is 0.5A / cm 2 , during the electrolysis process, the initial crystal temperature was tested after sampling the electrolyte at different positions in the electrolytic cell. The problem of cathode crusting caused by the rise of crystal temperature and precipitation caused by the drop of alumina dissolution rate can realize the stable operation of the electrolytic cell, the current efficiency can reach 94.5%, and the energy saving and emission reduction are obvious.
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