The carbon activation of electric furnace ferronickel slag and its utilization in cement-based materials

被引:0
作者
Wang, Yingbin [1 ]
Xiang, Zhiding [1 ]
Su, Ying [1 ,2 ]
He, Xingyang [1 ,2 ]
Yang, Jin [1 ]
Li, Yubo [1 ]
Jin, Zihao [1 ]
Strnadel, Bohumir [1 ,3 ]
机构
[1] Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China
[2] Hubei Univ Technol, Hubei Prov Bldg Waterproof Engn Res Ctr, Wuhan 430068, Hubei, Peoples R China
[3] VSB Tech Univ Ostrava, Ctr Adv & Innovat Technol, Ostrava 70800, Czech Republic
关键词
Ferronickel slag; Carbonation; Forsterite; Compressive strength; Hydration; MG SILICATE MINERALS; STRUCTURAL-CHANGES; WOLLASTONITE CARBONATION; CO2; SEQUESTRATION; PORTLAND-CEMENT; FINE AGGREGATE; TEMPERATURE; DISSOLUTION; XPS; REACTIVITY;
D O I
10.1016/j.cej.2024.154389
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The high annual emissions and low utilization rate of electric furnace ferronickel slag (EFS) have brought enormous impacts on environment. This work intends to propose a methodology for the carbon activation of EFS to improve its resource utilization. To this end, the exfoliation-carbonation (i.e., hybrid aqueous carbonation) was developed and compared with CO2 bubbling carbonation (i.e., direct aqueous carbonation). The carbonation process of EFS and the hydration and mechanical strength of activated EFS blended cement-based materials was evaluated. Experimental results indicated that mechanical pre-treatment could disorder forsterite crystal and promote the dissolution of Mg to form Si enriched mineral surface. The direct aqueous carbonation led to the formation of passivation layer which could be striped by hybrid aqueous carbonation to facilitate further carbon mineralization. Increase in temperature significantly improved the decomposition of forsterite and accelerated the carbon mineralization kinetics. The activated EFS could accelerate the hydration and promote the mechanical strength of cement-based materials. Carbon mineralization is an effective method to strengthening the activity of EFS.
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页数:13
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