FT-IR Spectroscopic Study on Structure of CaO-SiO_2 and CaO-SiO_2-CaF_2 Slags

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The FT-IR spectra of the CaO-SiO<sub>2</sub> and CaO-SiO<sub>2</sub>-CaF<sub>2</sub> slags were measured to understand the structural aspects of (fluoro-) silicate systems. The relative intensity of Si-O rocking band is very strong at SiO<sub>2</sub> saturation condition and this band disappears in the composition greater than 44.1 (mol%) CaO in the CaO-SiO<sub>2</sub> binary system. The bands for [SiO<sub>4</sub>]-tetrahedra at about 1 150-760 cm<sup>-1</sup> split up with increasing content of CaO greater than 44.1 mol%. The IR bands in this wavenumber range are divided into four groups, that is about 1090, 990, 920, and 870 cm<sup>-1</sup>, which have been assigned to NBO/Si=1, 2, 3, and 4, respectively. In the CaO-SiO<sub>2</sub> -CaF<sub>2</sub> (2CaO · SiO<sub>2</sub>-Satd.) system, the center of gravity of the bands at about 1170-710 cm<sup>-1</sup> shifts from about 980 to 850 cm<sup>-1</sup> by increasing the ratio <i>X</i><sub>CaF<sub>2</sub></sub>/<i>X</i><sub>SiO<sub>2</sub></sub> from 0.22 to 0.64. The bands for [SiO<sub>4</sub>]-tetrahedra are observed from about 1 070 to 730 cm<sup>-1</sup> in the CaO-17.6(mol%)SiO<sub>2</sub>-CaF<sub>2</sub> system, while these bands are observed from about 1120 to 720 cm<sup>-1</sup> in the CaO-40.0(mol%)SiO<sub>2</sub>-CaF<sub>2</sub> system. The effect of substitution of CaF<sub>2</sub> for CaO on the depolymerization of silicate network is observed to significantly depend on the SiO<sub>2</sub> content in the slags. The bands for [SiO<sub>4</sub>]-tetrahedra are observed from about 1110 to 720 cm<sup>-1</sup> in the CaO-SiO<sub>2</sub> -14.1(mol%)CaF<sub>2</sub> system and the center of gravity of these bands shifts from about 990 to 850 cm<sup>-1</sup> with increasing CaO/SiO<sub>2</sub> ratio. The fraction of the relatively depolymerized units continuously increases from about 0.5 to 0.8 as the composition of slags changes from 2CaO · SiO<sub>2</sub> to CaO saturation condition.

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  • ISIJ international

    ISIJ international 42(4), 344-351, 2002-04-15

    The Iron and Steel Institute of Japan

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