Research on the reduction and tempering of steel slag by bituminous coal at high temperature

Zaibo Li; Yongping Zhang; Tusheng He

doi:10.1117/12.2645655

30 August 2022 Research on the reduction and tempering of steel slag by bituminous coal at high temperature

Zaibo Li, Yongping Zhang, Tusheng He

Author Affiliations +

Proceedings Volume 12309, International Conference on Advanced Manufacturing Technology and Manufacturing Systems (ICAMTMS 2022); 123091I (2022) https://doi.org/10.1117/12.2645655
Event: International Conference on Advanced Manufacturing Technology and Manufacturing System (ICAMTMS 2022), 2022, Shijiazhuang, China

Abstract

Steel slag belongs to bulk industrial solid waste, and it is of great significance to carry out comprehensive application research of steel slag, which will help to realize the secondary resource and efficient utilization of steel slag. FeO and Fe₂O₃ in converter steel slag can be reduced to metallic iron in high temperature reducing atmosphere, which lays the foundation for optimizing the composition and structure of steel slag and improving the gelling activity of steel slag. In this paper, bituminous coal was used as reducing agent to carry out the reconstruction experiment of mineral composition of converter steel slag. The influence of bituminous coal content and reaction time on the cementitious activity of reconstructed steel slag was studied, and the mechanism of reduction and tempering was analyzed. The results show that the cementitious activity of the converter steel slag is significantly improved after reconstitution, and the 7 d, 28 d and 90 d activity indices of the mortar samples can reach 84%, 99% and 87%, respectively. Mineral composition analysis indicates that the reconstructed steel slag compositions are composed mainly of alite, belite, C₂F, C₆AF₂ and Fe₂O₃. After reconstruction, the formation of C₆AF₂ is found because of the combination of the aluminate phase and the ferrite phase at high temperature.

Citation Download Citation

Zaibo Li, Yongping Zhang, and Tusheng He "Research on the reduction and tempering of steel slag by bituminous coal at high temperature", Proc. SPIE 12309, International Conference on Advanced Manufacturing Technology and Manufacturing Systems (ICAMTMS 2022), 123091I (30 August 2022); https://doi.org/10.1117/12.2645655

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Cements

Minerals

Heat treatments

Particles

Scanning electron microscopy

Visual compression

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