过饱和铝酸钠溶液中Al(OH)_3均相成核机理  

Mechanism of homogeneous nucleation in supersaturated sodium aliminate solutions

作　　者：张立川[1] 陈启元[1] 尹周澜[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《中国有色金属学报》2008年第8期1560-1565,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金重点资助项目(520476107)

摘　　要：采用自行研制开发的铝酸钠溶液电导在线跟踪仪，在过饱和铝酸钠溶液均相成核过程中，在线检测温度为323、328和333K，苛性比为1.337，苛性钠初始浓度为50～110g／L的溶液电导率随时间的变化规律，确定反应诱导期。结果表明，过饱和铝酸钠溶液均相成核过程中的表观反应级数为6～8，临界固一液界面能为34～35mJ／m^2，临界成核半径为1．5～2．0μm，表观反应活化能为50.2kJ／mol，这表明铝酸钠溶液成核过程为单纯的均相反应机制，且成核速率与溶液相对过饱和度存在较强的依赖关系，整个成核过程属化学控制过程。The homogeneous nucleation induction period of synthetic, optically clear caustic aluminate solution were investigated with the application of a self-made online conductivity analyzer, The experiments were performed at 323, 328 and 333 K and solution ratio of 1.337 with Na2Ok concentration in the range of 50-110 g/L. The results show that the nucleation kinetics are 6-8 orders dependence upon A1203 relative supersaturation and strong temperature effect, the critical interracial energy is of 34-35 mJ/m^2, the critical nucleus size is of 1.5-2.0 μm and the activation energy is of 50.2 kJ/mol. The mechanism of sodium aluminate solution nucleation is homogeneous and chemical reaction controlled.

关 键 词：铝酸钠溶液 均相成核 电导率仪 在线检测 

分 类 号：O643.12[理学—物理化学]