Al2O3溶解度的影响
(1. 中南大学 冶金科学与工程学院，长沙 410083；2 广西师范大学 化学化工学院，桂林 541004)
摘 要: 采用步冷曲线法测定Na3AlF6-K3AlF6-AlF3-LiF熔体的初晶温度，采用旋转刚玉片质量损失法测定Al2O3在Na3AlF6-K3AlF6-AlF3-LiF熔体中的溶解度。结果表明：当LiF添加量在0~4%范围内时，每添加1% LiF使Na3AlF6-K3AlF6-AlF3熔体的初晶温度降低3~4.7 ℃，小于Na3AlF6-AlF3熔体中添加LiF后初晶温度的影响；在0~3%的范围内，每添加1% LiF将使 Al2O3在Na3AlF6-K3AlF6-AlF3熔体中的溶解度降低0.23%~0.55%。
关键字: Al2O3；LiF；Na3AlF6-K3AlF6-AlF3熔体；初晶温度；溶解度
Al2O3 in Na3AlF6-K3AlF6-AlF3 melts
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, China）
Abstract:The liquidus temperatures of Na3AlF6-K3AlF6-AlF3-LiF melts were tested by cooling curve, and the solubilities of Al2O3 in Na3AlF6-K3AlF6-AlF3-LiF melts were determined by the mass loss of rotating sintered corundum disc. The results show that the liquidus temperature decreases by 3−4.7 ℃ with increasing LiF by 1% in the content range of 0−4%, the increment is less than that in Na3AlF6 melts. The solubility of Al2O3 in Na3AlF6-K3AlF6-AlF3 melts decreases by 0.23%−0.55% with increasing LiF by 1% in the content range of 0−3%.
Key words: Al2O3; LiF; K3AlF6-K3AlF6-AlF3 melt; liquidus temperature; solubility
