Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1560-06
过饱和铝酸钠溶液中Al(OH)3均相成核机理
张立川,陈启元,尹周澜

(中南大学 化学化工学院,长沙 410083)

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323328333 K,苛性比1.337,苛性钠初始浓度50~110 g/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6~8,临界固液界面能34~35 mJ/m2,临界成核半径为1.5~2.0 μm 表观反应活化能为50.2 kJ/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。

 

关键词: 铝酸钠溶液;均相成核;电导率仪;在线检测

Mechanism of homogeneous nucleation in supersaturated sodium aliminate solutions
ZHANG Li-chuan, CHEN Qi-yuan, YIN Zhou-lan

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract: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 Al2O3 relative supersaturation and strong temperature effect, the critical interfacial energy is of 34−35 mJ/m2, 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.

 

Key words: sodium aluminate solution; homogeneous nucleation; conductivity analyzer; online detection

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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