镁铝离子共存硅酸体系的聚合行为

doi:10.3969/j.issn.0438-1157.2014.03.047

化工学报 ›› 2014, Vol. 65 ›› Issue (3): 1104-1110.DOI: 10.3969/j.issn.0438-1157.2014.03.047

• 材料化学工程与纳米技术 • 上一篇下一篇

镁铝离子共存硅酸体系的聚合行为

申星梅, 李辽沙, 武杏荣, 王平, 罗涛

安徽工业大学教育部冶金减排与资源综合利用重点实验室, 安徽马鞍山 243002

收稿日期:2013-06-18 修回日期:2013-07-22 出版日期:2014-03-05 发布日期:2014-03-05
通讯作者: 申星梅
作者简介:申星梅（1982—），女，博士，讲师。
基金资助:
安徽省高等学校省级自然科学研究项目（KJ2012A041）；安徽省自然科学基金项目（1208085QB30）。

Polymerization behavior of silicic acid with coexisting magnesium and aluminum ions

SHEN Xingmei, LI Liaosha, WU Xingrong, WANG Ping, LUO Tao

Key Laboratory of Metallurgical Emission Reduction & Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan 243002, Anhui, China

Received:2013-06-18 Revised:2013-07-22 Online:2014-03-05 Published:2014-03-05
Supported by:
supported by the University Science Research Project of Anhui Province (KJ2012A041) and the Natural Science Foundation of Auhui Province(1208085QB30).

摘要/Abstract

摘要： 通过对镁铝离子共存硅酸体系中硅酸胶凝时间、单硅酸聚合反应速率以及凝胶热性能的研究，得出：在pH<；4的微酸性条件下，硅酸体系的胶凝时间随镁铝离子共存浓度的增大而减小，且铝离子在对硅酸体系的促凝过程中起主要作用。镁铝离子共存硅酸体系的单硅酸反应速率常数比不含金属离子硅酸体系的有所增大，计算得出MA_0.1+0.1硅酸体系的单硅酸平均速率常数为：k₀=7.28×10^-4，k₁=5.62×10^-4。镁铝离子共存硅酸体系凝胶的晶化转变温度与晶型转变温度，相较于不含金属离子硅酸体系的均有所降低，根据热重曲线计算出MA_0.1+0.1硅酸体系水合二氧化硅的化学式为：SiO₂·0.556 H₂O。

关键词: 硅酸体系, 镁铝离子, 胶凝时间, 聚合, 凝胶, 二氧化硅

Abstract: Gel time, polymerization rate of monosilicic acid, and thermal performance of gel of silicic acid system with coexisting Mg²⁺ and Al³⁺ ions were investigated. At pH<4, gel time of silicic acid system decreased with the increase of coexisting concentration of Mg²⁺ and Al³⁺ ions, and Al³⁺ ions played an important role in the coagulation process. Polymerization reaction rate constant of monosilicic acid, for silicic acid system with coexisting Mg²⁺ and Al³⁺ ions, was higher than that for silicic acid without metallic ions, and average rate constant for MA_0.1+0.1system was k₀=7.28×10^-4, k₁=5.62×10^-4. Crystallization temperature and crystal transformation temperature of silicic acid system with coexisting Mg²⁺ and Al³⁺ ions were lower than those of silicic acid without metallic ions, and chemical formula of hydrated silicon dioxide for MA_0.1+0.1system calculated by TG curve was SiO₂·0.556 H₂O.

Key words: silicic acid system, magnesium and aluminum ions, gel time, polymerization, gels, silica

中图分类号:

TQ170.9

申星梅, 李辽沙, 武杏荣, 王平, 罗涛. 镁铝离子共存硅酸体系的聚合行为[J]. 化工学报, 2014, 65(3): 1104-1110.

SHEN Xingmei, LI Liaosha, WU Xingrong, WANG Ping, LUO Tao. Polymerization behavior of silicic acid with coexisting magnesium and aluminum ions[J]. CIESC Journal, 2014, 65(3): 1104-1110.

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镁铝离子共存硅酸体系的聚合行为

Polymerization behavior of silicic acid with coexisting magnesium and aluminum ions

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