A clean disposal method of carbide slag with carbon emission reduction: Used as a flux for iron ore sintering--颗粒学报PARTICUOLOGY

Meng, H., Wang, J., Liu, X., Jin, K., Zhang, L., & Zhou, H. (2024). A clean disposal method of carbide slag with carbon emission reduction: Used as a flux for iron ore sintering. Particuology, 91, 303-314. https://doi.org/10.1016/j.partic.2024.03.012

A clean disposal method of carbide slag with carbon emission reduction: Used as a flux for iron ore sintering

Hanxiao Meng, Jiankang Wang, Xiang Liu, Kelang Jin, Lei Zhang, Hao Zhou^*

State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China

10.1016/j.partic.2024.03.012

Volume 91, August 2024, Pages 303-314

Received 31 October 2023, Revised 25 January 2024, Accepted 18 March 2024, Available online 16 April 2024, Version of Record 20 April 2024.

E-mail: zhouhao@zju.edu.cn

Highlights

• Carbide slag has great potential as a flux in the iron ore sintering process.

• Bonding effect of carbide slag can improve the permeability of the green bed.

• A proper amount of carbide slag helps generate excellent bonding phases in sinter.

• 75% of lime can be replaced by carbide slag, with little change in sinter quality.

• Utilization of carbide slag can achieve considerable CO₂ emission reduction.

Abstract

Limestone or quicklime is a necessary flux in the iron ore sintering process. Its production and application process will cause CO₂ emissions and various environmental pollution, but this has not attracted enough attention. Carbide slag (CS) is a calcium-rich solid waste produced in acetylene production, the harmless disposal of which is still incomplete, resulting in soil and groundwater pollution. This study investigated the granulation characteristics and sintering performance of the sintering mixture with different proportions of CS. The results show that replacing limestone with an appropriate proportion of CS is promising and beneficial to the formation of high-quality bonding phase. When CS accounts for 75% of the total mass of CS and limestone, the tumbler index increases by 8.10% and the comprehensive index decreases only from 100 to 96.16, which is within the acceptable range. The application of CS in iron ore sintering can achieve a clean disposal of it and a considerable carbon emission reduction, as the main component of which is Ca(OH)₂.

Graphical abstract

Keywords

Iron ore sintering; Carbide slag; Flux; Carbon emission; Comprehensive index

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