高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (8): 1262.

• 论文 • 上一篇    下一篇

浓碱高苛性比铝酸钠溶液中水合铝硅酸钠形成的动力学研究

刘桂华, 李小斌, 彭志宏, 张传福   

  1. 中南工业大学冶金系, 长沙 410083
  • 收稿日期:1998-11-09 出版日期:1999-08-24 发布日期:1999-08-24
  • 通讯作者: 刘桂华,男,30岁,博士后.
  • 作者简介:刘桂华,男,30岁,博士后.
  • 基金资助:

    教育部博士点基金(批准号:96053309)资助

The Kinetics of the Formation of Sodium Aluminosilicate Hydrate in Strong Caustic Solutions

LIU Gui-Hua, LI Xiao-Bin, PENG Zhi-Hong, ZHAGN Chuan-Fu   

  1. Department of Nonferrous Metallurgy, Central South University of Technology, Changsha 410083, China
  • Received:1998-11-09 Online:1999-08-24 Published:1999-08-24

PDF (PC)

被引次数

56

摘要： 研究了浓碱高苛性比铝酸钠溶液中水合铝硅酸钠形成的动力学行为,反应对Al(OH)4-、SiO2(OH)22-均为一级反应.结合溶液的结构和沸石形成机理,提出了五配位中间体形成机理;提高反应温度、降低碱浓度、加强搅拌或加入晶种(或杂质)均有利于水合铝硅酸钠的形成.

关键词: 水合铝硅酸钠, 动力学, 五配位中间体

Abstract: The kinetics of the formation of sodium aluminosilicate hydrate in strong caustic solutions at high mole ratio(between Na2O and Al2O3) were studied. It was one order for Al(OH)4- and SiO2(OH)22- ion respectively. The value of apparent active energy was 86.42 kJ/mol. Based on the analysis of the structure of the aluminate solution and the mechanism of the formation of zeolite, the mechanism of five-ligand intermediate state was set up. It was advantageous for the formation of sodium aluminosilicate hydrate to increase the temperature, or to decrease the caustic concentration, or to intensify the agitation, or to add the seed(or impurities) in the alumina production.

Key words: Sodium aluminosilicate hydrate, Kinetics, Five-ligand intermediate state

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