在Na_3AlF_6-AlF_3-CaF_2-LiF-Al_2O_3体系中低温铝电解

Low temperature Aluminum Electrolysis in Na_3AlF_6-AlF_3-CaF_2-LiF-Al_2O_3 Bath System

研究了Na3AlF6－AlF3－CaF2－LiF－Al2O3熔盐体系的物化性质，包括液相线温度、电导率和密度，并选择该体系中的低分子比电解质在100A垂直排铝式电解槽上进行了电解制铝．结果表明，用TiB2材料做阴极，当所使用的电解质分子数比为1．5～2．0，电解温度为800～930℃时，电流效率达到84．6％～88．3％，每kgAl的直流电耗为11．5～11．83kw·h．

Based on the main physico-chemical properties of Na_3AlF_6-AlF_3 -CaF_2-LiF-Al_2O_3 system studied, including liquidus temperature、electrical conductivity and bath density, a laboratory scale vertical discharging aluminum type electrolysis cell of about 100A capacity was run with TiB_2 cathodes and low molar ratio(1.5~2.0) electrolytes at 800~930℃ range. Aluminum metal was obtained with 84.6%~88.3% current efficiencies and 11.54~11.83 kW·h/ kg specific energy consumption.