Phosphorus speciation in dicalcium silicate phases: Application to the basic oxygen furnace (BOF) slag

Cédric Duée 1 Christine Bourgel 1 Emmanuel Véron 1 Mathieu Allix 1 Franck Fayon 1 Françoise Bodénan 2 Jacques Poirier 1
1 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
Abstract : The recycling of basic oxygen furnace slag in the steelmaking process is currently limited by its phosphorus content. Phosphorus is known to induce remarkable phase segregation in the slag microstructure and is only present in phases belonging to the C2S–C3P solid solution, the iron-containing phases being left free of phosphorus. The mechanism of phosphorus insertion into calcium silicate structures was studied by a combination of TEM, XRD and 29Si and 31P solid-state NMR. Upon P2O5 addition, [PO4]3 − units are incorporated into the dicalcium silicate structure by substituting [SiO4]4 − groups, charge balance being maintained by creation of calcium vacancies. This substitution leads to a stabilization of the β- and α-Ca2SiO4 phases at room temperature and results in the formation of more polymerized calcium silicate secondary phases. The obtained P-substituted α-Ca2SiO4 compounds belong to the Ca2 − x/2Si1 − xPxO4 solid solution and exhibit lattice parameters similar to those of the calcium phosphosilicate Ca15(PO4)2(SiO4)6 phase.
Keywords : Structural characterization Cement Ca2SiO4 Phosphorus Waste management
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https://hal-brgm.archives-ouvertes.fr/hal-01400780
Contributeur : Anne-Marie Pouget <>
Soumis le : mardi 22 novembre 2016 - 14:36:07
Dernière modification le : jeudi 1 novembre 2018 - 01:18:47

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BRGM | UNIV-ORLEANS | CEMHTI

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Cédric Duée, Christine Bourgel, Emmanuel Véron, Mathieu Allix, Franck Fayon, et al.. Phosphorus speciation in dicalcium silicate phases: Application to the basic oxygen furnace (BOF) slag. Cement and Concrete Research, Elsevier, 2015, 73, pp.207 - 214. 〈10.1016/j.cemconres.2015.03.012〉. 〈hal-01400780〉

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