高等学校化学学报

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (8): 1651.

• 研究论文 • 上一篇    下一篇

铝酸钠溶液的电导率与结构的关系

李小斌1, 王丹琴1, 梁爽2, 刘桂华1, 彭志宏1, 周秋生1   

  1. 1. 中南大学冶金科学与工程学院, 长沙 410083;
    2. 南京大学化学化工学院, 南京 210093
  • 收稿日期:2009-10-13 出版日期:2010-08-10 发布日期:2010-08-10
  • 通讯作者: 刘桂华, 男, 博士, 教授, 主要从事有色金属冶金研究. E-mail: Liugh303@163.com
  • 基金资助:

    国家“九七三”计划项目(批准号: 2005CB6237)资助.

Relationship Between Electric Conductivity and Ion Structure of Sodium Aluminate Solution

LI Xiao-Bin1, WANG Dan-Qin1, LIANG Shuang2, LIU Gui-Hua1*, PENG Zhi-Hong1, ZHOU Qiu-Sheng1   

  1. 1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; 
    2. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
  • Received:2009-10-13 Online:2010-08-10 Published:2010-08-10
  • Contact: LIU Gui-Hua. E-mail: Liugh303@163.com
  • Supported by:

    国家“九七三”计划项目(批准号: 2005CB6237)资助.

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被引次数

38

摘要： 通过测定不同浓度Na2O和苛性比(αk)的铝酸钠溶液的电导率, 计算了不同Na2O浓度下铝酸根阴离子的迁移数, 结合铝酸钠溶液的红外光谱表征, 研究了铝酸钠溶液的电导率与结构的关系. 研究结果表明, 低浓度铝酸钠溶液[c(Na2O)<175 g/L]中, 铝酸根阴离子的迁移数约为0.6, 其离子结构主要为Al(OH)4-; 中等浓度溶液[c(Na2O)=175~330 g/L]中, 铝酸根阴离子的迁移数约为0.2, 其离子结构主要为Al(OH)4-和[Al2(OH)8(H2O)2]2-; 而高浓度溶液[c(Na2O)>330 g/L]中, 铝酸根阴离子的离子迁移数接近于0, 对应的离子结构主要是Al2O(OH)62-, [Al2(OH)8(H2O)2]2-和少量Al(OH)4-. 说明铝酸根离子的导电能力与结构密切相关.

关键词: 铝酸钠溶液, 电导率, 迁移数, 离子结构

Abstract: A better understanding of the relationship between transference number of aluminate anions(t) and the structure of sodium aluminate solutions is of great significance for strengthening and optimizing the alumina production technologies. Combining with the characterization of FTIR analyses of the solution, the intrinsic relationship between the electric conductivity and the structure of sodium aluminate solutions was investigated by measuring the electric conductivity of the solution and calculating t in the solution of different alkali concentration and molar ratio of Na2O to Al2O3. The results show that in the solution of low concentration of c(Na2O)<175 g/L, the aluminate anions dominantly exist in the form of Al(OH)4- and t is approximately 0.6; that in the solution of medium concentration of c(Na2O) from 175 g/L to 330 g/L, the aluminate anions mainly exist in the form of Al(OH)4- and [Al2(OH)8(H2O)2]2-, in which t is approximately 0.2; and that in the solution of high concentration of c(Na2O)>330 g/L, aluminate anions exist dominantly in the form of Al2O(OH)62- and [Al2(OH)8(H2O)2]2- with a little Al(OH)4-, where t is almost zero. This illustrates that the electric conduction ability of the aluminate anion in the sodium aluminate solution is closely related to its structure.

Key words: Aluminate solution, Electric conductivity, Transference number, Ion structure

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