Feasibility of incorporating phosphogypsum in ettringite-based binder from ladle slag

JOURNAL OF CLEANER PRODUCTION

卷:237

Article

Gijbels, Katrijn¹  Hoang Nguyen²  Kinnunen, Paivo²  Schroeyers, Wouter¹  Pontikes, Yiannis³  Schreurs, Sonja¹  Illikainen, Mirja² 

[1] Hasselt Univ, CMK, Nucl Technol Ctr, Agoralaan,Gebouw H, B-3590 Diepenbeek, Belgium

[2] Univ Oulu, Fibre & Particle Engn Res Unit, Pentti Kaiteran Katu 1, Oulu 90014, Finland

[3] Katholieke Univ Leuven, Dept Mat Engn, Kasteelpk Arenberg 44, B-3001 Leuven, Belgium

关键词: Ladle slag;    Phosphogypsum;    Ettringite;    Hydration;    Mineralogy;    Compressive strength;   

DOI  :  10.1016/j.jclepro.2019.117793

来源: Elsevier

【 摘 要 】

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. (C) 2019 The Authors. Published by Elsevier Ltd.

【 授权许可】

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