煅烧温度对氢氧化钙溶液处理过的玉米秸秆灰活性的影响

戚庭野; 王昊晨; 冯国瑞; 张玉江; 白锦文; 韩艳娜

doi:10.1007/s12613-020-2148-3

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Jun. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(6): 1161-1169

Tingye Qi, Haochen Wang, Guorui Feng, Yujiang Zhang, Jinwen Bai, and Yanna Han, Effect of calcination temperature on the pozzolanic activity of maize straw stem ash treated with portlandite solution, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1161-1169. https://doi.org/10.1007/s12613-020-2148-3

Cite this article as:

Tingye Qi, Haochen Wang, Guorui Feng, Yujiang Zhang, Jinwen Bai, and Yanna Han, Effect of calcination temperature on the pozzolanic activity of maize straw stem ash treated with portlandite solution, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1161-1169. https://doi.org/10.1007/s12613-020-2148-3

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研究论文

煅烧温度对氢氧化钙溶液处理过的玉米秸秆灰活性的影响

1)
太原理工大学矿业工程学院，太原 030024
2)
山西省绿色采矿工程技术研究中心，太原 030024
3)
山西省煤基资源绿色高效开发工程研究中心，太原 030024
4)
矿山岩层控制及灾害防控山西省重点实验室，太原 030024

通讯作者:
冯国瑞 E-mail: fgr09000@126.com

文章亮点

(1) 运用多种理化手段评估了煅烧温度对玉米秸秆灰火山灰活性的影响。

(2) 研究阐明了无定形SiO2在氢氧化钙溶液中向C-S-H转化的Si-O链式结构演变。

(3) 综合确定了玉米秸秆灰火山灰活性最佳的煅烧温度。

中文摘要

本研究评估了煅烧温度对玉米秸秆灰火山灰活性的影响。将经500℃、700℃、850℃煅烧后的玉米秸秆灰样品分别在氢氧化钙溶液中溶解6个小时，并得到其残留样品。用Fourier变换红外光谱仪、X射线衍射仪、扫描电子显微镜、X射线光电子能谱对玉米秸秆灰样品和玉米秸秆灰残留样品进行分析，确定化学键形式、矿物组成、微观结构和Si 2p转化行为，并研究了玉米秸秆灰-氢氧化钙混合溶液的电导率、pH值、电导率损失随溶解时间的变化规律。玉米秸秆灰的主要氧化物成分为二氧化硅和氧化钾。与其他煅烧温度相比，经500℃煅烧后的玉米秸秆灰Si⁴⁺溶解度含量较高。由于玉米秸秆灰在700℃下含有较多的KCl，有加快反应速率的作用，因此经700℃煅烧的玉米秸秆灰与氢氧化钙混合溶液的电导率和电导率损失均高于其他煅烧温度。玉米秸秆灰样品中检测有水化硅酸钙，玉米秸秆灰残留样品中发现有较小的立方形和接近球形的水化硅酸钙颗粒。总的来说，在500℃下玉米秸秆灰具有最佳的火山灰活性但要考虑凝聚的影响。

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Research Article

Effect of calcination temperature on the pozzolanic activity of maize straw stem ash treated with portlandite solution

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Abstract

Abstract

The effect of calcination temperature on the pozzolanic activity of maize straw stem ash (MSSA) was evaluated. The MSSA samples calcined at temperature values of 500, 700, and 850°C were dissolved in portlandite solution for 6 h, thereby obtaining residual samples. The MSSA and MSSA residual samples were analyzed using Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy to determine vibration bonds, minerals, microstructures, and Si 2p transformation behavior. The conductivity, pH value, and loss of conductivity with dissolving time of the MSSA-portlandite mixed solution were also determined. The main oxide composition of MSSA was silica and potassium oxide. The dissolution of the Si⁴⁺ content of MSSA at 500°C was higher than those of the other calcination temperatures. The conductivity and loss of conductivity of MSSA at 700°C were higher than those of the other calcination temperatures at a particular dissolving time due to the higher KCl content in MSSA at 700°C. C–S–H was easily identified in MSSA samples using X-ray powder diffraction, and small cubic and nearly spherical particles of C–S–H were found in the MSSA residual samples. In conclusion, the optimum calcination temperature of MSSA having the best pozzolanic activity is 500°C, but excessive agglomeration must be prevented.
- calcination temperature;
- pozzolanic activity;
- maize straw stem ash;
- portlandite solution

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