Na_3AlF_6-AlF_3-LiF-CaF_2系熔体的等溶初晶温度和等溶变温密度

Initial crystallization temperature and density at nonequal temperature of Na_3AlF_6-AlF_3-LiF-CaF_2 system under isosolubity of alumina

基于 ( 2 .2 3～ 3.0 )NaF·AlF3 ( 0～ 5% )LiF ( 0～ 1 5% )CaF2 系熔体初晶温度、变温氧化铝溶解能力和变温密度的研究 ,首次得到了氧化铝溶解能力为 6% ,8%和 1 0 %时温度范围在 91 0～ 950℃的等溶初晶温度和密度在2 .0 4～ 2 .2 0 g/cm3之间的等溶变温密度。分析了分子比、LiF添加量和CaF2 添加量对这两种性质的影响规律 ,为铝电解工业选择适宜的电解质成分提供了具有可比性的科学的理论依据。

According to the regression equations of initial crystallization temperature(ICT), the solubility of alumina and density at the temperature of 20 ℃ above its ICT of (2.23～3.0)NaF·AlF 3 (0～5%)LiF (0～15%)CaF 2 system,the ICT isograms within the range of 910～950 ℃ and the density isograms at nonequal temperature within the range of 2.04～2.20 g/cm 3 under the 6%, 8%, 10% solubility of alumina were first obtained respectively. The effects of bath ratio, concentration of LiF and CaF 2 were discussed. It can provide the scientific theoretical basis for choosing suitable aluminium electrolyte composition.