Crystallization of calcium silicate at elevated temperatures in highly alkaline system of Na2O-CaO-SiO2-H2O

Ganyu Zhu; Huiquan Li; Shaopeng Li; Xinjuan Hou; Xingrui Wang

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Crystallization of calcium silicate at elevated temperatures in highly alkaline system of Na₂O-CaO-SiO₂-H₂O

Materials and Product Engineering | Updated：2026-01-06

- Crystallization of calcium silicate at elevated temperatures in highly alkaline system of Na₂O-CaO-SiO₂-H₂O
- Chinese Journal of Chemical Engineering Vol. 25, Issue 10, Pages: 1539-1544(2017)
- Affiliations：
  
  1. Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences,Beijing,China,100190
  2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences,Beijing,China,100049
- Author bio：
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- Published：2017
- Accepted：
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O-CaO-SiO
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O-CaO-SiO DOI：

摘要

Abstract

In Na

O-CaO-SiO

-H

O system

systematic investigations of phase and morphology of calcium silicate in hydrothermal conditions were concisely conducted for high-value utilization of silicon resource in high-alumina fly ash (HAFA). The results show that crystal composition and phase may be affected by relatively low concentration of NaOH

and sodium ions are rearranged into the structure to form NaCaHSiO

and Na

with different C/S ratio at high concentration of NaOH. In addition

phases in wollastonite group possess the morphology of nanofiber. Formation of nanofiber is attributed to the difference of surface energies between axial and radial direction

and higher temperatures lead to easier growth along radial direction. The preparation of C-S-H with different phases and morphologies can guide for the application of silicate solution with high alkalinity with different purposes.

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