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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?液界面能为34~35mJ/m2,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 sodium aluminate solution conductance line tracer developed by ourselves was used to detect the homogenization nucleation of the supersaturated sodium aluminate solution. The online detection temperatures were 323, 328 and 333 K, the caustic ratio was 1.337 and the caustic soda initial concentration was 50 ~ The conductivity of 110g / L solution changes with time, to determine the induction period. The results show that the apparent reaction order in the homogeneous nucleation process of supersaturated sodium aluminate solution is 6 ~ 8, the critical solid - liquid interface energy is 34 ~ 35mJ / m2, the critical nucleation radius is 1.5 ~ 2.0μm, the table View of the reaction activation energy of 50.2kJ / mol, indicating that the sodium aluminate solution nucleation process as a simple homogeneous reaction mechanism, and the nucleation rate and the solution relative supersaturation there is a strong dependence of the nucleation process is a chemical Control the process.