东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (10): 1433-1438.DOI: 10.12068/j.issn.1005-3026.2018.10.013

• 材料与冶金 • 上一篇    下一篇

铝酸钠溶液中Al(OH)3吸附草酸盐行为研究

于海燕, 王江洲, 张佰永, 潘晓林   

  1. (东北大学 冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2017-07-03 修回日期:2017-07-03 出版日期:2018-10-15 发布日期:2018-09-28
  • 通讯作者: 于海燕
  • 作者简介:于海燕(1967-), 女, 辽宁本溪人, 东北大学教授.冯明杰(1971-), 男, 河南禹州人, 东北大学副教授; 王恩刚(1962-), 男, 辽宁沈阳人, 东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51774079, 51674075).国家自然科学基金资助项目(51171041).

Adsorption Behavior of Oxalate on Al(OH)3 in Sodium Aluminate Solution

YU Hai-yan, WANG Jiang-zhou, ZHANG Bai-yong, PAN Xiao-lin   

  1. School of Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2017-07-03 Revised:2017-07-03 Online:2018-10-15 Published:2018-09-28
  • Contact: PAN Xiao-lin
  • About author:-
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摘要: 通过模拟拜耳法晶种分解过程研究了铝酸钠溶液中Al(OH)3对草酸盐的吸附平衡和动力学行为,并考察了草酸盐初始浓度和Al(OH)3粒度对吸附的影响规律. 结果表明:Al(OH)3对草酸钠有较大的吸附能力,随草酸钠浓度的升高和Al(OH)3粒度的细化,草酸钠吸附率随之升高,达到平衡的时间也相应缩短;不同粒度Al(OH)3的吸附能力不同,这跟Al(OH)3的比表面积有很大关系;Al(OH)3对草酸钠的等温吸附符合Freundlich模型,吸附动力学符合准二级动力学方程,吸附行为为多分子层吸附,同时存在物理和化学吸附过程.

关键词: Al(OH)3, 草酸盐, 吸附, 平衡, 动力学

Abstract: The adsorption equilibrium and kinetics of oxalate on Al(OH)3 in sodium aluminate solution were studied by simulating the seed precipitation of the Bayer process, and the effects of initial oxalate concentration and the particle size of Al(OH)3 on adsorption were also investigated. The results showed that Al(OH)3 has a good adsorption ability on sodium oxalate. With increasing initial sodium oxalate concentration and decreasing particle size of Al(OH)3, the equilibrium adsorption rate increases and the equilibrium adsorption time decreases. The adsorption capacity for different particle size of Al(OH)3 is different due to the different specific surface area. The adsorption isotherm pattern of sodium oxalate on Al(OH)3 fits the Freundlich model well and the adsorption process can be described by the pseudo-second-order equation. The adsorption of oxalate on Al(OH)3 is a multilayer adsorption, associated with physical and chemical adsorption processes.

Key words: Al(OH)3, oxalate, adsorption, equilibrium, kinetics

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