摘要
了解掌握铝电解质物理化学性质是实现铝电解工艺参数协同配置和过程高效控制的前提。本文基于我国工业铝电解质的基本体系,通过Factsage软件计算系统研究了AlF3、Al2O3、CaF2、LiF、MgF2对铝电解质初晶温度和氧化铝溶解度的影响规律,结果表明:当AlF3含量为5wt.%-15wt.%时,各添加剂对电解质初晶温度的影响顺序为:LiF〉MgF2〉AlF3〉CaF2,每添加1%的LiF、MgF2、AlF3、CaF2,电解质初晶温度分别降低8.5~9、5~8.4、3.5~4、2.4~3℃,且电解质中每增加1%的Al2O3,电解质初晶温度降低7℃。当AlF3含量为10wt.%~15wt.%时,各添加剂对Al2O3溶解度的影响顺序为:LiF〉MgF2〉CaF2〉A1F3,且平均每添加1%的LiF、MgF2、CaF2、AlF3,Al2O3溶解度分别降低0.65%-0.53%、0.44%~0.46%、0.42%~0.36%、0.22%-0.33%。
The better understanding of physicochemical properties of aluminum electrolytes is the promise to improve the control of aluminum cell and opti- mize the configuration on parameters. In this article, Factsage is used to calculate the liquidus temperature and Al2O3 solubility of the conventional baths. The impact of a range of AlF3 , Al2O3 , CaF2 , LiF, MgF2 on the physicochemical properties is discussed. The results show that: when the content of AlF3 is 5wt. % - 15 wt. %, the tendency of additives to reduce the liquidus temperature follows the order: LiF 〉 MgF: 〉 AlF3 〉 CaF2. The liquidus temperature decreases 8.5 -9, 5 -8.4, 3.5 -4, 2. 4 -3, 7℃ with per 1% addition of LiF, MgF2, AlF3 , CaF2 , Al2O3 , respectively. When the content of AlF3 is 10wt. % - 15 wt. %, the tendency of additives to reduce the Al2O3 solubility follows the order: LiF 〉 MgF2 〉 CaF2 〉 AlF3. The Al2O3 solubility decreases 0.65%-0. 53%, 0. 44%-0.46%, 0.42%-0. 36%, 0.22%-0. 33% with per 1% addition of LiF, MgF2, CaF2, AlF3, respectively.
出处
《轻金属》
CSCD
北大核心
2015年第9期27-31,共5页
Light Metals
基金
国家科技支撑项目(2012BAE08B02)
关键词
铝电解质
初晶温度
Al2O3溶解度
熔盐化学
aluminum electrolytes
liquidus temperature
Al2O3 solubility
molten salt chemistry