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2016 , Vol. 16 >Issue 3: 477 - 481

DOI: https://doi.org/10.12034/j.issn.1009-606X.215403

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
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  • 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 date: 2015-12-01

  Revised date: 2016-01-07

  Online published: 2017-04-28

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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

Cite this article

SHEN Xing-mei LI Liao-sha WU Xing-rong ZHU Jian-hua AI Jin . Effects of Ca2+ and Al3+ on the Polymerization of Silicic Acid without Na+[J]. The Chinese Journal of Process Engineering, 2016 , 16(3) : 477 -481 . DOI: 10.12034/j.issn.1009-606X.215403

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