在Na3AlF6-AlF3-CaF2-LiF-Al2O3体系中低温铝电解

在Na₃AlF₆-AlF₃-CaF₂-LiF-Al₂O₃体系中低温铝电解

摘要: 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.

Abstract: Based on the main physico-chemical properties of Na₃AlF₆-AlF₃-CaF₂-LiF-Al₂O₃ 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 TiB₂ 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.