The Viscositys of CaO-SiO&lt;SUB&gt;2&lt;/SUB&gt;-Alkaline Earth Fluoride Systems (On the Viscosity of Molten Slags, (I))

Shiraishi, Yasuyuki; Saitô, Tunezô

doi:10.2320/jinstmet1952.29.6_614

Cited by 18 publications

(18 citation statements)

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“…The ratio of a CaF 2 /a CaO was 2.7, which showed that the influence of CaF 2 on the viscosity of molten SiO 2 -CaO-CaF 2 was 2 or 3 times larger than that of CaO. This value is similar to that reported by Shiraishi et al 22) for the addition of CaF 2 to molten SiO 2 -CaO-CaF 2 , which decreased the viscosity 2.2 times more than CaO did. The viscosity of the molten quaternary SiO 2 -CaO-Al 2 O 3 -CaF 2 system is shown in Figs.…”

Section: Calculated Results Of Molten Silicate Viscositysupporting

confidence: 78%

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A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

Miyabayashi¹,

Nakamoto

Tanaka

et al. 2009

ISIJ Int.

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Section: Calculated Results Of Molten Silicate Viscositysupporting

confidence: 78%

“…[21][22][23] The parameters were deter- (ii) Subsequently the a j in Al value was assessed for each charge-compensating cation j by fitting the calculated viscosity with a i for the binary system as determined in (i) to the experimental data for each ternary SiO 2 …”

Section: Determination Of Parametersmentioning

confidence: 99%

A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

Miyabayashi¹,

Nakamoto

Tanaka

et al. 2009

ISIJ Int.

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“…by CaF 2 Addition It is well known that addition of CaF 2 lowers the viscosity of slags considerably, [2][3][4] and several structural models have been presented to explain the effect of CaF 2 .…”

Section: Mechanism For Lowering the Viscosities Of Slagsmentioning

confidence: 99%

“…The structure of silicate glasses containing CaF 2 has been predicted from the data obtained by means of viscosity [2][3][4] and cryoscopic measurements, 5) and studied more directly using spectroscopic measurements such as infrared absorption, [6][7][8][9] Raman, 10,11) X-ray photoelectron 12,13) and 19 F nuclear magnetic resonance spectroscopies. 14,15) The conclusions deduced from the above reports can be classified into three conflicting views:…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluorine on Silicate Network for CaO-CaF2-SiO2 and CaO-CaF2-SiO2-FeOx Glasses.

et al. 2002

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The chemical state of fluorine and the effect of fluorine addition on the degree of polymerization of silicate network have been investigated for the CaO-SiO 2 -CaF 2 and CaO-SiO 2 -CaF 2 -FeO x glasses using the Xray photoelectron spectroscopy (XPS) and Mössbauer spectroscopy measurements. The F1s XPS spectra indicate that the fluorine is dominantly coordinated with calcium rather than silicon. The O1s XPS spectra for the CaO-SiO 2 -CaF 2 glasses and the values of Fe 2ϩ /Fe 3ϩ obtained by Mössbauer spectra for the CaO-SiO 2 -CaF 2 -FeO x glasses indicate that CaF 2 addition does not depolymerize the silicate network for both systems.KEY WORDS: chemical state of fluorine; polymerization; silicate network; X-ray photoelectron spectroscopy; Mössbauer spectroscopy.

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“…[1][2][3][4][5][6][7][8] However, the need for a model that could accurately predict the continuous changes in viscosities due to increase in the alumina content of the fluoride-containing slags as well as the evaporation of fluorides from the slag has strongly been felt. In view of this, a research program was initiated in the present laboratory to describe the viscosities of mould fluxes as a function of both composition and temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Addition of Al2O3 on the Viscosity of CaO-"FeO"-SiO2-CaF2 Slags.

2002

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The viscosities of CaO-"FeO"-SiO 2 -CaF 2 slags with various amounts of alumina addition were measured using a rotating-cylinder method in the temperature range 1 714-1 757 K. The first part of the experiments was conducted by measuring the viscosities under equilibrium conditions after small additions of Al 2 O 3 . Similar experiments were also conducted with one commercial mould flux in order to compare the results. In both cases, the viscosities were found to increase with the addition of Al 2 O 3 at all the experimental temperatures, the increase in viscosity being somewhat linear with Al 2 O 3 addition. In the case of the commercial mould flux, even an addition of 2.6 mass% Al 2 O 3 led to a significant increase in the viscosity.Some isothermal experiments were also conducted with the above set of slags in the dynamic mode, wherein, the changes in the slag viscosities were monitored as a function of time as an Al 2 O 3 disc dissolved continuously into the slag. The experiments were so designed that the dissolution of alumina occurred mainly along the vertical direction. The rate of dissolution of alumina is discussed in the light of the rate of change of viscosity as well as the composition profile in the slag after the experiments. An examination of the Al 2 O 3 disc revealed the counter diffusion of the slag components into the solid alumina and that the dissolution took place by the solid product dissolving in the melt.

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The Viscositys of CaO-SiO<SUB>2</SUB>-Alkaline Earth Fluoride Systems (On the Viscosity of Molten Slags, (I))

Cited by 18 publications

References 1 publication

A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

Effect of Fluorine on Silicate Network for CaO-CaF2-SiO2 and CaO-CaF2-SiO2-FeOx Glasses.

The Effect of Addition of Al2O3 on the Viscosity of CaO-"FeO"-SiO2-CaF2 Slags.

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