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过程工程学报 ›› 2016, Vol. 16 ›› Issue (3): 477-481.DOI: 10.12034/j.issn.1009-606X.215403

• 过程与工艺 • 上一篇    下一篇

Ca2+,Al3+对不含Na+硅酸体系聚合行为的影响

申星梅 李辽沙 武杏荣 朱建华 艾进   

  1. 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 安徽工业大学化工学院 安徽工业大学安徽省冶金工程与资源综合利用重点实验室 安徽工业大学安徽省冶金工程与资源综合利用重点实验室 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
  • 收稿日期:2015-12-01 修回日期:2016-01-07 出版日期:2016-06-20 发布日期:2017-04-28
  • 通讯作者: 申星梅

Effects of Ca2+ and Al3+ on the Polymerization of Silicic Acid without Na+

SHEN Xing-mei LI Liao-sha WU Xing-rong ZHU Jian-hua AI Jin   

  1. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology Anhui Provincial Key Laboratory of Metallurgy Engineering ﹠ Resources Recycling, Anhui University of Technology Anhui Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology Anhui Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology
  • Received:2015-12-01 Revised:2016-01-07 Online:2016-06-20 Published:2017-04-28
  • Contact: SHEN Xing-mei

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摘要： 为排除Na+对硅酸聚合的影响，用酸解水淬硅酸钙制备了不含金属离子的硅酸溶液及含Ca2+, Al3+的硅酸溶液，研究了加入Ca2+, Al3+对体系聚合行为的影响. 结果表明，加入Ca2+后体系pH值略微降低，加入Al3+后体系pH值显著降低. 初始pH≤2时，Al3+对硅酸聚合起促凝作用，初始pH>2时，Al3+起缓凝作用. Ca2+对硅酸聚合影响不大. 硅酸凝胶后，含Al3+硅酸体系中形成Al?O?Si键，阻碍了凝胶结构水脱附；Ca2+则阻碍凝胶的晶化转变过程，且凝胶中的结构水变少. 不含金属离子、含Ca2+、含Al3+体系的化学式分别为SiO2×0.52H2O, SiO2×0.36H2O, SiO2×1.50H2O.

关键词: 硅酸体系, 钙离子, 铝离子, 聚合, 凝胶

Abstract: To eliminate the effect of Na+ on the polymerization of silicic acid, silicic acid without any metal ions was prepared by acid hydrolysis of water-quenched calcium sillicate. After adding Ca2+, pH value of silicic acid slightly decreased, while it significantly decreased after adding Al3+. The polymerization rate of silicic acid is accelerated by Al3+ at initial pH≤2, but reduced at initial pH>2. As for Ca2+, it had no obvious effect on polymerization of silicic acid. After gelation, Al?O?Si bond was formed in the silica gel, which hindered dehydration of bound water. The crystallization process was hindered by Ca2+, and the amount of bound water decreased. The chemical formulas of silica gels with no ions, Ca2+ and Al3+ are SiO2×0.52H2O, SiO2×0.36H2O, SiO2×1.50H2O, respectively.

Key words: silicic acid system, calcium ions, aluminum ions, polymerizatio, gel

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