硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (2): 517-527.DOI: 10.16552/j.cnki.issn1001-1625.2025.0861
张梦甜1(
), 王学凯1,2(
), 徐子芳1,3, 扈霜月1, 李政1, 李佳韦1
收稿日期:2025-08-26
修订日期:2025-09-21
出版日期:2026-02-20
发布日期:2026-03-09
通信作者:
王学凯,博士,讲师。E-mail:771381779@qq.com作者简介:张梦甜(2002—),女,硕士研究生。主要从事固废资源化利用方面的研究。E-mail:13781602640@163.com
基金资助:
ZHANG Mengtian1(
), WANG Xuekai1,2(
), XU Zifang1,3, HU Shuangyue1, LI Zheng1, LI Jiawei1
Received:2025-08-26
Revised:2025-09-21
Published:2026-02-20
Online:2026-03-09
摘要:
本研究以粉煤灰(CFA)为原料,通过碱熔-水热法实现了高活性可溶性硅的提取与纳米级羟基硅酸钙(CSH)的可控制备,为煤基固废的高值化利用提供了可行路径。具体流程包括:采用Na2CO3作为活化剂,在850 ℃煅烧2 h,煅烧产物与水以固液比1∶10溶解,80 ℃水浴90 min后固液分离,得到提硅液,硅提取率为45.7%;提硅液与CaCl2在80 ℃水浴中反应3 h,成功合成CSH。缓释研究表明:所制备的CSH在柠檬酸溶液中硅释放行为符合Higuchi扩散模型,最大硅缓释浓度为350 mg/L;在不同pH值环境下CSH亦表现出持续释放特性,当pH值为6和8时,硅缓释浓度在第3天分别达到150与100 mg/L。本研究实现了CFA的低成本资源化转化,制备的CSH对推动固废绿色资源化利用和农业可持续发展具有重要意义。
中图分类号:
张梦甜, 王学凯, 徐子芳, 扈霜月, 李政, 李佳韦. 碱熔法从粉煤灰中制备羟基硅酸钙及其硅缓释性能研究[J]. 硅酸盐通报, 2026, 45(2): 517-527.
ZHANG Mengtian, WANG Xuekai, XU Zifang, HU Shuangyue, LI Zheng, LI Jiawei. Preparation of Calcium Silicate Hydrate from Fly Ash by Alkali Fusion Method and Its Silicon Slow-Release Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(2): 517-527.
| Ingredient | SiO2 | Al2O3 | Fe2O3 | CaO | MgO |
|---|---|---|---|---|---|
| Mass fraction/% | 45.999 | 26.218 | 4.962 | 2.750 | 0.462 |
表1 CFA的主要化学成分
Table 1 Main chemical composition of CFA
| Ingredient | SiO2 | Al2O3 | Fe2O3 | CaO | MgO |
|---|---|---|---|---|---|
| Mass fraction/% | 45.999 | 26.218 | 4.962 | 2.750 | 0.462 |
图7 不同条件下CSH、CSH-NH4+和CSH-PO43?-反应产物缓释3 d及短时间缓释的可溶性硅浓度
Fig.7 Soluble silicon concentration in slow-release products for 3 d and short-term slow-release periods from reaction of CSH, CSH-NH4+, CSH-PO43?- under different conditions
| Kinetic model | Parameter | CSH | CSH- | CSH- |
|---|---|---|---|---|
| Higuchi equation | C | 2.164 | 29.250 | 1.211 |
| 36.295 | 33.383 | 21.917 | ||
| 0.990 | 0.950 | 0.971 | ||
| Pseudo-second-order equation | 1/( | 0.013 | 0.004 | 0.022 |
| 1/ | 0.012 | 0.010 | 0.020 | |
| 0.966 | 0.999 | 0.986 |
表2 动力学拟合方程数据分析
Table 2 Kinetic fitting equations and data analysis
| Kinetic model | Parameter | CSH | CSH- | CSH- |
|---|---|---|---|---|
| Higuchi equation | C | 2.164 | 29.250 | 1.211 |
| 36.295 | 33.383 | 21.917 | ||
| 0.990 | 0.950 | 0.971 | ||
| Pseudo-second-order equation | 1/( | 0.013 | 0.004 | 0.022 |
| 1/ | 0.012 | 0.010 | 0.020 | |
| 0.966 | 0.999 | 0.986 |
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