钢渣烧结过程的矿物相转变及性能研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1731-1739.

所属专题：资源综合利用

钢渣烧结过程的矿物相转变及性能研究

王亚楠^1,2, 赵德强^1,2, 李正旺³, 郜祥³, 沈卫国^1,2, 王桂明^1,2, 张文生⁴

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070;
3.贵州博宏实业有限责任公司,六盘水 553000;
4.中国建筑材料科学研究总院,北京 100024

收稿日期:2023-02-13 修订日期:2023-03-03 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 沈卫国,博士,教授。E-mail:shenwg@whut.edu.cn
作者简介:王亚楠(1997—),女,硕士研究生。主要从事胶凝材料的研究。E-mail:1486612576@qq.com
基金资助:
国家重点实验室开放课题(FH2018sk201)

Mineral Phase Transformation and Properties of Steel Slag in Process of Melting and Sintering

WANG Yanan^1,2, ZHAO Deqiang^1,2, LI Zhengwang³, GAO Xiang³, SHEN Weiguo^1,2, WANG Guiming^1,2, ZHANG Wensheng⁴

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. Guizhou Bohong Industry Company Limited, Liupanshui 553000, China;
4. China Building Materials Academy, Beijing 100024, China

Received:2023-02-13 Revised:2023-03-03 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 钢渣由于早期活性低,易磨性差,安定性不良,制约了其在水泥混凝土中的大规模利用。本文通过对钢渣进行高温重构,研究了钢渣在不同重构温度下的矿物相转变及易磨性、安定性、活性指数的变化。结果表明:高温可以优化钢渣的矿物相组成,促进难磨相浮氏体(Fe_xO)、RO相的转化,促进钢渣中硅酸二钙(C₂S)向硅酸三钙(C₃S)转变,促进镁铁尖晶石(MgFe₂O₄)的生成;矿物及液相分布均匀,矿物组成良好、边界更清晰的重构钢渣往往表现出更高的强度,试验所用两种钢渣经过1 400 ℃的高温重构,其28 d活性指数可分别达99.03%和96.52%;钢渣中f-CaO含量随重构温度的升高而显著降低;易磨性则随着重构温度的升高呈先升高后降低的趋势。

关键词: 钢渣重构, 易磨性, 安定性, 矿物组成, 水溶性铬(Ⅵ), 活性指数

Abstract: Due to the low early hydration activity, poor grindability and soundness of steel slag, which restricts its large-scale utilization in cement and concrete. In this paper, the mineral phase transformation and the changes of grindability, soundness and activity index of reconstructed steel slag at different reconstructed temperatures were studied. The results show that the high temperature optimizes the mineral phase composition of steel slag, promotes the transformation of the refractory phase (Fe_xO) and RO phase, promotes the transformation of dicalcium silicate (C₂S) to tricalcium silicate (C₃S) in steel slag, and promotes the formation of magnesium iron spinel (MgFe₂O₄). The reconstructed steel slag with uniform mineral and liquid phase distribution, good mineral composition and clearer boundary often shows higher strength, and the 28 d activity indexes of the two kinds of steel slag at the 1 400 ℃ reach 99.03% and 96.52%, respectively. The f-CaO content in steel slag decreases significantly with the increase of reconstructed temperature, and the grindability increases first and then decreases with the increase of reconstructed temperature.

Key words: steel slag reconstruction, grindability, soundness, mineral composition, water-soluble chromium (Ⅵ), activity index

中图分类号:

TU526

王亚楠, 赵德强, 李正旺, 郜祥, 沈卫国, 王桂明, 张文生. 钢渣烧结过程的矿物相转变及性能研究[J]. 硅酸盐通报, 2023, 42(5): 1731-1739.

WANG Yanan, ZHAO Deqiang, LI Zhengwang, GAO Xiang, SHEN Weiguo, WANG Guiming, ZHANG Wensheng. Mineral Phase Transformation and Properties of Steel Slag in Process of Melting and Sintering[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1731-1739.

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钢渣烧结过程的矿物相转变及性能研究

Mineral Phase Transformation and Properties of Steel Slag in Process of Melting and Sintering

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