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Publication Detail
Low energy synthesis of cement compounds in molten salt
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Photiadis G, Maries A, Tyrer M, Inman D, Bensted J, Simons S, Barnes P
  • Publisher:
    MANEY PUBLISHING
  • Publication date:
    04/2011
  • Pagination:
    137, 141
  • Journal:
    ADV APPL CERAM
  • Volume:
    110
  • Issue:
    3
  • Print ISSN:
    1743-6753
  • Language:
    EN
  • Keywords:
    Cement, Molten salt, Low energy, Synthesis, Dicalcium silicate, Belite, X-RAY-DIFFRACTION, DICALCIUM SILICATE, CRYSTAL-STRUCTURE, CALCIUM-CHLORIDE, OXIDE NANORODS, POWDERS, CA2SIO4, NITRATE, ALUMINATE, OXIDATION
  • Addresses:
    Photiadis, G
    UCL
    Dept Chem Engn
    Ctr Technol CO2
    London
    WC1E 7JE
    England
Abstract
The world cement industry is responsible for >5% of the total anthropogenic carbon dioxide emissions blamed for causing global warming. The production of cement clinker minerals by precipitation from a molten salt solvent offers a potential route to energy reduction in cement manufacture. Molten salt synthesis of the major cement compounds beta-dicalcium silicate (beta-Ca2SiO4, beta-C2S) and tricalcium silicate (Ca3SiO5, C3S) has been attempted in fused sodium chloride (NaCl). The synthesis of beta-Ca2SiO4 was carried out by the reaction of CaCO3 with SiO2 in molten NaCl (CaCO3-SiO2-NaCl mole ratios 2 : 1 : 19.2 at 908 degrees C, and 2 : 1 : 20.4, 2 : 1 : 13.5, 2 : 1 : 10.3 and 2 : 1 : 8 at 1140 degrees C). The product was characterised by powder X-ray diffraction, Raman scattering and scanning electron microscopy. For the synthesis of Ca3SiO5, reactants with a molar ratio of 3 : 1 were used (CaCO3-SiO2-NaCl 3 : 1 : 19.8 at 908 and 1000 degrees C, and 3: 1 : 20, 3 : 1 : 14, 3: 1: 9.9 and 3 : 1 : 8.1 at 1140 degrees C). In all cases beta-Ca2SiO4 was the principal product, with the CaO phase still present and (if any) only small quantities of Ca3SiO5. These observations, coupled with previous studies on the solid state synthesis of Ca3SiO5, indicate that beta-Ca2SiO4 is an intermediate compound, requiring in excess of 1140 degrees C to react with CaO in order to form tricalcium silicate.
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