Feasibility of incorporating phosphogypsum in ettringite-based binder from ladle slag
Gijbels, Katrijn; Nguyen, Hoang; Kinnunen, Päivö; Schroeyers, Wouter; Pontikes, Yiannis; Schreurs, Sonja; Illikainen, Mirja (2019-07-26)
Katrijn Gijbels, Hoang Nguyen, Paivo Kinnunen, Wouter Schroeyers, Yiannis Pontikes, Sonja Schreurs, Mirja Illikainen, Feasibility of incorporating phosphogypsum in ettringite-based binder from ladle slag, Journal of Cleaner Production, Volume 237, 2019, 117793, ISSN 0959-6526, https://doi.org/10.1016/j.jclepro.2019.117793
© 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019080823776
Tiivistelmä
Abstract
Aiming to utilize phosphogypsum (PG) as a construction material, this study investigated the potential use of PG as a calcium sulfate source for the production of an ettringite-based binder (LSG). Six compositions with different percentages and PG’s of different origin were hydrated with ladle slag (LS) to form LSG. The hydration, mineralogy and compressive strength of all mixtures were investigated and compared with a reference LSG made of pure synthetic gypsum. The minor impurities in PG, the different particle size distribution as well as the mineralogy induced distinguishable effects on the heat of hydration, phase assemblage and morphology. The results showed that the use of side-stream PG instead of pure gypsum results in superior properties with a 60% increase in compressive strength. This investigation shows high potential to produce a completely by-product-based LSG by combining different sources of industrial side-streams with minimal chemical and energy use.
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