湿选钢渣尾泥制备充填胶凝材料试验研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (9): 3022-3028.

湿选钢渣尾泥制备充填胶凝材料试验研究

任超¹, 倪文², 王勇华¹

1.唐山学院工程精益建造与信息化重点实验室,唐山 063000;
2.北京科技大学土木与资源工程学院,北京 100083

收稿日期:2021-03-19 修回日期:2021-05-17 出版日期:2021-09-15 发布日期:2021-10-08
作者简介:任超(1988—),男,博士,讲师。主要从事固体废弃物资源化利用的研究。E-mail:renchaov@163.com
基金资助:
河北省高等学校科学技术研究(QN2021319);唐山市科技计划(19150233E)

Preparation of Filling Cementitious Materials with Wet Sorting Steel Slag Mud

REN Chao¹, NI Wen², WANG Yonghua¹

1. Key Laboratory of Engineering Lean Construction and Informatization, Tangshan University, Tangshan 063000, China;
2. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2021-03-19 Revised:2021-05-17 Online:2021-09-15 Published:2021-10-08

摘要/Abstract

摘要： 钢渣尾泥是转炉钢渣经过湿磨磁选后排出的二次废渣,堆存量大且难以实现大规模资源化利用。以钢渣尾泥为主要原料,协同其他工业固废制备胶凝材料可用于矿山充填。本文开展了钢渣尾泥基充填胶凝材料配合比正交试验、充填材料力学性能测试,利用X射线衍射(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)等多种微观测试手段对钢渣尾泥基胶凝材料的水化机理进行分析。结果表明,钢渣尾泥掺量为55%(质量分数,下同),矿渣掺量为30%,脱硫石膏掺量为15%,胶砂质量比为1:4,料浆浓度为72%时,所制备的充填材料28 d抗压强度可达4.78 MPa,满足矿山充填材料性能的要求。钢渣尾泥基胶凝材料的水化产物主要为C-S-H凝胶和钙矾石,以及少量的Ca(OH)₂,体系内水化产物C-S-H凝胶和钙矾石晶体的数量随着水化龄期的增加而明显增长。

关键词: 钢渣尾泥, 胶凝材料, 充填材料, 水化反应, 抗压强度, 正交试验

Abstract: Steel slag mud is the secondary waste slag from converter slag after wet grinding and magnetic separation, which has large storage and is difficult to realize large-scale resource utilization. Steel slag mud as the main raw material cooperating with other industrial solid wastes is used to prepare cementitious materials for mine filling. Orthogonal test of mixture ratio and mechanical property test of steel slag mud cementitious filling materialswere carried out. The hydration mechanism of cementitious materials based on steel slag mud was analyzed by XRD, SEM, FT-IR and other microscopic testing methods. The results show that when steel slag mud content (mass fraction, the same below) is 55%, slag content is 30%, desulfurization gypsum content is 15%, cement-sand mass ratio is 1:4 and slurry concentration is 72%, the 28 d compressive strength of filling materials is 4.78 MPa, which meets the requirements of working performance of mine filling materials. The hydration products of steel slag tailings are mainly C-S-H gel and AFt, and a small amount of Ca(OH)₂. The amount of hydration products C-S-H gel and AFt crystal in the system increases obviously with the increase of hydration age.

Key words: steel slag mud, cementitious material, filling material, hydration reaction, compressive strength, orthogonal test

中图分类号:

TU526
X757

任超, 倪文, 王勇华. 湿选钢渣尾泥制备充填胶凝材料试验研究[J]. 硅酸盐通报, 2021, 40(9): 3022-3028.

REN Chao, NI Wen, WANG Yonghua. Preparation of Filling Cementitious Materials with Wet Sorting Steel Slag Mud[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3022-3028.

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