Upcycling Steel Slag in Producing Eco-Efficient Iron-calcium Phosphate Cement
In the present study, steel slag powder (SSP) was utilized as the raw material to prepare iron-calcium phosphate cement (ICPC) by reacting with ammonium dihydrogen phosphate (ADP). The influences of the raw materials (SSP/ADP) mass ratios ranging from 2.0 to 7.0 on the properties and microstructures of ICPC pastes were investigated. The compressive strengths of ICPC pastes at all ages firstly increased and then decreased with the increase of SSP/ADP, and the SSP/ADP of 6.0 gave the highest strength. Crystalline mundrabillaite and amorphous phases [i.e. Fe(OH)3, Al(OH)3 and H4SiO4] were formed as the dominant binding phases through the reactions of the calcium-containing compounds (brownmillerite, monticellite and srebrodolskite) in the steel slag and ADP. Further, ADP could also react with the free FeO contained in the steel slag to yield amorphous iron phosphate phase. BSE analysis indicated that the hydration products formed and growed on the surface of steel slag particles and connect them to form the continuous, dense microstructure of ICPC paste. The utilization of high-volume steel slag as the base component will potentially bring great economic and environmental benefits for the manufacture of phosphate cement.
Y. Ma et al., "Upcycling Steel Slag in Producing Eco-Efficient Iron-calcium Phosphate Cement," Journal of Cleaner Production, vol. 371, article no. 133688, Elsevier, Oct 2022.
The definitive version is available at https://doi.org/10.1016/j.jclepro.2022.133688
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Ammonium Dihydrogen Phosphate; Hydration; Iron-Calcium Phosphate Cement; Properties; Steel Slag
International Standard Serial Number (ISSN)
Article - Journal
© 2022 Elsevier, All rights reserved.
15 Oct 2022
The authors appreciate the financial support from the National Natural Science Foundation of China (No. 21866018 and 51662024), Yunnan Ten Thousand Talents Plan Young & Elite Talents Project (No. YNWR-QNBJ-2018-388 and YNWR-QNBJ-2020-063).