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

Cement and Concrete Research, ISSN: 0008-8846, Vol: 73, Page: 207-214
2015
  • 21
    Citations
  • 0
    Usage
  • 52
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    21
    • Citation Indexes
      21
  • Captures
    52

Article Description

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 C 2 S–C 3 P 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 29 Si and 31 P solid-state NMR. Upon P 2 O 5 addition, [PO 4 ] 3− units are incorporated into the dicalcium silicate structure by substituting [SiO 4 ] 4− groups, charge balance being maintained by creation of calcium vacancies. This substitution leads to a stabilization of the β- and α-Ca 2 SiO 4 phases at room temperature and results in the formation of more polymerized calcium silicate secondary phases. The obtained P-substituted α-Ca 2 SiO 4 compounds belong to the Ca 2−x/2 Si 1−x P x O 4 solid solution and exhibit lattice parameters similar to those of the calcium phosphosilicate Ca 15 (PO 4 ) 2 (SiO 4 ) 6 phase.

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