KR脱硫渣碱激发矿渣的配比优化及水化特性

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 170-179.

所属专题：资源综合利用

KR脱硫渣碱激发矿渣的配比优化及水化特性

李鑫^1,2, 杜惠惠^1,2, 倪文^1,2, 傅平丰^1,2, 王飞³

1.北京科技大学土木与资源工程学院,北京 100083;
2.工业典型污染物资源化处理北京重点实验室(北京科技大学),北京 100083;
3.首钢京唐钢铁联合有限公司,唐山 063000

收稿日期:2022-08-15 修订日期:2022-08-29 出版日期:2023-01-15 发布日期:2023-02-15
通信作者: 倪文,博士,教授。E-mail:niwen@ces.ustb.edu.cn
作者简介:李鑫(1998—),男,硕士研究生。主要从事脱硫渣和钢渣资源化利用方面的研究。E-mail:lx255254@163.com
基金资助:
国家重点研发计划(2020YFC1807804)

Ratio Optimization and Hydration Characteristics of KR Desulfurization Slag Alkali-Activated Granulated Blast-Furnace Slag

LI Xin^1,2, DU Huihui^1,2, NI Wen^1,2, FU Pingfeng^1,2, WANG Fei³

1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants (University of Science and Technology Beijing), Beijing 100083, China;
3. Shougang Jingtang United Iron & Steel Co., Ltd., Tangshan 063000, China

Received:2022-08-15 Revised:2022-08-29 Online:2023-01-15 Published:2023-02-15

摘要/Abstract

摘要： KR脱硫渣是铁水脱硫工序产生的废渣,多种固废协同制备胶凝材料是脱硫渣资源化的有效途径。本文利用KR脱硫渣、矿渣和脱硫石膏制备固废基胶凝材料,研究KR脱硫渣和矿渣掺量对胶凝材料力学性能的影响,优化原材料配比。通过XRD、TG-DSC、IR、SEM-EDS和水化热测试方法研究了固废基胶凝材料的水化产物及水化特性。结果表明,固废基胶凝材料优化配比为KR脱硫渣25%(质量分数,下同),矿渣60%,脱硫石膏15%,胶凝材料3 d、28 d、90 d抗压强度分别达到30.01 MPa、49.47 MPa和55.73 MPa。固废基胶凝材料的早期水化放热速率低,3 d累积放热量仅为普通硅酸盐水泥(OPC)的37.9%,其水化产物主要是针棒状钙矾石(AFt)和无定形水化硅酸钙(C-S-H)凝胶。KR脱硫渣中大量的Ca(OH)₂在水化早期可以碱激发矿渣,使玻璃相硅酸盐解体,同时与脱硫石膏反应促进AFt的生成。KR脱硫渣、矿渣和脱硫石膏协同反应使水化后期的水化产物持续增加,相互胶结形成致密结构,有利于强度的持续增长。

关键词: KR脱硫渣, 固废基胶凝材料, 碱激发, 钙矾石, C-S-H凝胶, 多固废协同, 碳化

Abstract: KR desulfurization slag is a kind of waste residue produced by desulphurization process of hot iron. The synergistic preparation of cementitious materials with various solid wastes is an effective way to recycle the desulfurization slag. In this paper, KR desulfurization slag, granulated blast-furnace slag and desulfurization gypsum were used to prepare solid waste-based cementitious materials, and the effects of KR desulfurization slag content and granulated blast-furnace slag content on the mechanical properties of cementitious materials were studied, so as to optimize the ratio of raw materials. The hydration products and hydration characteristics of solid waste-based cementitious materials were studied by XRD, TG-DSC, IR, SEM-EDS and hydration heat test methods. The results show that the optimum ratio of solid waste-based cementitious materials is KR desulfurization slag 25% (mass fraction, the same below), granulated blast-furnace slag 60%, and desulfurized gypsum 15%. The 3 d, 28 d and 90 d compressive strength of cementitious materials reach 30.01 MPa, 49.47 MPa and 55.73 MPa, respectively. The early hydration heat release rate of solid waste-based cementitious materials is low, and the cumulative heat release in 3 d is only 37.9% of ordinary Portland cement (OPC). The main hydration products are needle-rod ettringite (AFt) and amorphous calcium silicate hydrate (C-S-H) gel. A large amount of Ca(OH)₂ in KR desulphurized slag can excite the slag alkali at the early stage of hydration to disintegrate the glassy silicate, and react with desulphurized gypsum to promote the formation of AFt. In the later stage of hydration, the synergistic reaction of KR desulfurization slag, granulated blast-furnace slag and desulfurized gypsum makes the hydration products increase continuously, and the dense structure is formed by mutual cementation, which is conducive to the continuous growth of strength.

Key words: KR desulphurization slag, solid waste-based cementitious material, alkali excitation, ettringite, C-S-H gel, multi solid waste coordination, carbonization

中图分类号:

TU526
X756

李鑫, 杜惠惠, 倪文, 傅平丰, 王飞. KR脱硫渣碱激发矿渣的配比优化及水化特性[J]. 硅酸盐通报, 2023, 42(1): 170-179.

LI Xin, DU Huihui, NI Wen, FU Pingfeng, WANG Fei. Ratio Optimization and Hydration Characteristics of KR Desulfurization Slag Alkali-Activated Granulated Blast-Furnace Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 170-179.

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KR脱硫渣碱激发矿渣的配比优化及水化特性

Ratio Optimization and Hydration Characteristics of KR Desulfurization Slag Alkali-Activated Granulated Blast-Furnace Slag

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