钢渣尾泥-矿渣-脱硫石膏三元体系水化硬化特性

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 536-544.

钢渣尾泥-矿渣-脱硫石膏三元体系水化硬化特性

李云云¹, 梁文特², 倪文¹, 牟欣丽¹, 李玥¹, 樊康²

1.北京科技大学土木与资源工程学院,北京 100083;
2.河钢股份有限公司邯郸分公司,邯郸 056003

收稿日期:2021-07-13 修回日期:2021-09-24 出版日期:2022-02-15 发布日期:2022-03-01
通讯作者: 倪文,博士,教授。E-mail:niwen@ces.ustb.edu.cn
作者简介:李云云(1990—),女,博士研究生。主要从事固体废弃物资源化利用的研究。E-mail:lyyustb@163.com
基金资助:
河北省重点研发计划(19273805D)

Characteristics of Hydration and Hardening of Steel Slag Mud-Blast Furnace Slag-Desulphurization Gypsum System

LI Yunyun¹, LIANG Wente², NI Wen¹, MU Xinli¹, LI Yue¹, FAN Kang²

1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Handan Iron and Steel Group Co., Ltd., HSIS Group Co., Ltd., Handan 056003, China

Received:2021-07-13 Revised:2021-09-24 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 为促进大宗化利用钢渣尾泥,以河北迁安的钢渣尾泥为研究对象,借助X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、傅里叶红外光谱(FT-IR)、热重-差热分析(TG-DTA)测试方法,研究了钢渣尾泥在矿渣-脱硫石膏体系中的水化硬化特性。研究表明,经机械粉磨后的钢渣尾泥仍表现出较好的水硬胶凝特性,与普通钢渣-矿渣-脱硫石膏体系相比具有早期强度高的优势,其水化产物主要为钙矾石(AFt)和水化硅酸钙(C-S-H)凝胶。在水化反应过程中:钢渣尾泥为体系提供碱性环境,促使矿渣中玻璃体解离;矿渣水化不断消耗羟基,进一步促进了钢渣尾泥的水化;脱硫石膏为体系提供大量的Ca²⁺和SO^2-₄,这些离子与体系中的凝胶反应生成AFt。三者相互渗透协同反应推动了水化反应持续进行。

关键词: 钢渣尾泥, 矿渣-脱硫石膏体系, 水化硬化, 钙矾石, C-S-H凝胶, 协同反应

Abstract: In order to promote large quantity and high value-added utilization of steel slag mud, the hydration and hardening characteristics of steel slag mud from Qian’an of Hebei under blast furnace slag and desulphurization gypsum were investigated with XRD, FE-SEM, FT-IR and TG-DTA. The results indicate that the steel slag mud still shows good hydrated cementitious property after mechanical grinding. Compared with ordinary steel slag-blast furnace slag-desulphurization, the compressive strength of cementitious materials has the advantage of high early strength. Its hydration products are mainly AFt and C-S-H gel. During the hydration reaction process, the steel slag mud provides an alkaline environment for the system and promotes the dissociation of the vitreous in the slag. The slag hydration continuously consumes hydroxyl groups to further promote the hydration of the steel slag mud. The desulfurized gypsum provides a large amount of Ca²⁺and SO^2-₄, which react with gel in the system to produce AFt. The three materials interact with each other to synergistic reaction and promote the continuous hydration reaction.

Key words: steel slag mud, blast furnace slag-desulphurization gypsum system, hydration and hardening, ettringite, C-S-H gel, synergistic reaction

中图分类号:

TF09

李云云, 梁文特, 倪文, 牟欣丽, 李玥, 樊康. 钢渣尾泥-矿渣-脱硫石膏三元体系水化硬化特性[J]. 硅酸盐通报, 2022, 41(2): 536-544.

LI Yunyun, LIANG Wente, NI Wen, MU Xinli, LI Yue, FAN Kang. Characteristics of Hydration and Hardening of Steel Slag Mud-Blast Furnace Slag-Desulphurization Gypsum System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 536-544.

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