Development of cold-bonded briquettes using by-product-based ettringite binder from ladle slag
Abdelrahim, Ahmed; Nguyen, Hoang; Omran, Mamdouh; Kinnunen, Päivö; Iljana, Mikko; Illikainen, Mirja; Fabritius, Timo (2022-02-18)
Abdelrahim, A., Nguyen, H., Omran, M. et al. Development of Cold-Bonded Briquettes Using By-Product-Based Ettringite Binder from Ladle Slag. J. Sustain. Metall. 8, 468–487 (2022). https://doi.org/10.1007/s40831-022-00511-1
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https://urn.fi/URN:NBN:fi-fe2022051635649
Tiivistelmä
Abstract
The recycling of steel plant side streams through cold-bonded briquettes has become quite common. However, Portland cement is mainly used as a binder in the briquettes, contributing significantly to the energy consumption, costs, and carbon footprint associated with the production of cold-bonded briquettes. This paper reports on a more sustainable method for side stream recycling that involves replacing cement with an ettringite-based binder. Ettringite binders develop early high strength and mainly consist of ladle slag, another side stream of the industry. Here, the ettringite-based binder is assessed in terms of its mechanical and thermal properties against a reference briquette made using the conventional technique. Three different briquette types are produced using several side stream materials and varying ettringite-based binder content. Briquettes produced using 15% and higher ettringite-based binder content exhibited excellent mechanical properties within a shorter curing period compared to conventional used binder. Moreover, the ettringite-based binder briquettes exhibited a better swelling behavior to conventional cement briquettes under conditions simulating a blast furnace.
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