Determination of refractive index and absorption coefficient of iron- oxide-bearing slags

Susa, Masahiro; Li, Futao; Nagata, Kazuhiro

doi:10.1007/bf02656289

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…In these fields, the idea of "basicity" as it applies to oxides, particularly melts, is an analogy between the dissociation of acids to produce hydrogen ions and the dissociation of network anions such as silicates to produce oxygen ions (Bach et al 2001). Various conceptions of basicity in oxides have been employed (Mills 1995) as measures of free oxygen ion thermodynamic activity, ranging from simple ones like the ratio of CaO to SiO 2 , (Susa et al 1992) to more physically grounded ones based on the Coulomb force between the cation and oxygen (Moringa et. al 1994).…”

Section: B1 Introductionmentioning

confidence: 99%

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Rodriguez¹,

McCloy²,

Schweiger³

et al. 2011

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SummaryThe purpose of this study was to find compositions that increase waste loading of high-alumina wastes beyond what is currently acceptable while avoiding crystallization of nepheline (NaAlSiO 4 ) on slow cooling. Nepheline crystallization has been shown to have a large impact on the chemical durability of high-level waste glasses. It was hypothesized that there would be some composition regions where high-alumina would not result in nepheline crystal production, compositions not currently allowed by the nepheline discriminator.Optical basicity (OB) and the nepheline discriminator (ND) are two ways of describing a given complex glass composition. This report presents the theoretical and experimental basis for these models. They are being studied together in a quadrant system as metrics to explore nepheline crystallization and chemical durability as a function of waste glass composition. These metrics were calculated for glasses with existing data and also for theoretical glasses to explore nepheline formation in Quadrant IV (passes OB metric but fails ND metric), where glasses are presumed to have good chemical durability. Several of these compositions were chosen, and glasses were made to fill poorly represented regions in Quadrant IV.To evaluate nepheline formation and chemical durability of these glasses, quantitative X-ray diffraction (XRD) analysis and the Product Consistency Test were conducted. A large amount of quantitative XRD data is collected here, both from new glasses and from glasses of previous studies that had not previously performed quantitative XRD on the phase assemblage.Appendix A critically discusses a large dataset to be considered for future quantitative studies on nepheline formation in glass. Appendix B provides a theoretical justification for choice of the oxide coefficients used to compute the OB criterion for nepheline formation.v

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Section: B1 Introductionmentioning

confidence: 99%

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Rodriguez¹,

McCloy²,

Schweiger³

et al. 2011

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“…In these fields, the idea of “basicity” as it applies to oxides, particularly melts, is an analogy between the dissociation of acids to produce hydrogen ions in aqueous solutions and the dissociation of network anions, such as silicates, to produce oxygen ions in oxide melts . Various conceptions of basicity in oxides have been employed as measures of free oxygen ion thermodynamic activity, ranging from simple ones such as the ratio of CaO to SiO 2 to more physically grounded ones based on the cation/oxygen Coulomb force …”

Section: Introductionmentioning

confidence: 99%

Nepheline Crystallization in Nuclear Waste Glasses: Progress Toward Acceptance of High‐Alumina Formulations

McCloy

Schweiger

Rodriguez

et al. 2011

Int J of Appl Glass Sci

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Historical data have been critically compiled and analyzed for investigating the quantity of nepheline (NaAlSiO4) precipitated as a function of composition in simulated nuclear waste glasses. To understand compositional effects two primary methods were used: (1) investigating the Al2O3–SiO2–Na2O ternary while filtering for different B2O3 levels and (2) creating a quadrant system consisting of compositions reduced to two representations: (i) the nepheline discriminator (ND) which depends only on the SiO2 content by weight normalized to the total weight of the Al2O3–SiO2–Na2O submixture and (ii) the optical basicity (OB) which contains contributions from all constituents in the glass. Nepheline precipitation is expected to be suppressed at high SiO2 levels (ND > 0.62) or at low basicities (OB < 0.55–0.57). Changes in sodium aluminosilicate glass OB values due to additions of CaO and B2O3 correlate with the observed effects on nepheline formation. It is proposed that additional composition space is available for formulating high waste loading, high‐Al2O3 nuclear waste glasses when consideration is given to location on the Al2O3–SiO2–Na2O submixture as well as OB.

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“…Equation (15) is adopted in this work for facileness, since errors arising from the effects of reflection at surface and multiple reflections have been shown to be less than 5%. 14) Based on the experimental infrared transmittance spectra of mold flux samples, absorption coefficients and extinction coefficients at room temperature calculated by Eq. (15) glassy samples.…”

Section: Characteristics Of Absorption Coefficient and Extinction Coementioning

confidence: 99%

Effect of Transition Metal Oxides on Radiative Heat Transfer through Mold Flux Film in Continuous Casting of Steel

et al. 2007

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Mold fluxes containing transition metal oxides, FeO and MnO, were designed based on the composition of commercial mold fluxes. Infrared transmittances of disc flux samples were measured with an FTIR spectrometer at room temperature. Extinction coefficient and absorption coefficient were calculated using Beer's Law. A radiative heat exchange model was developed. The relationship between the radiation heat flux and the content of transition metal oxides was determined by experiment and analyzed using the model. The result indicates that adding MnO and FeO has a negative effect on radiative heat transfer through disc flux samples. The radiation heat flux through the MnO and FeO containing samples was 20-50 % smaller than that through basic fluxes. The decrease in radiation heat flux was attributed to the changing of molecular structure and crystallization of the fluxes. Mn 2 SiO 4 , Fe 2 SiO 4 and other minor phases were also found in the samples containing MnO and FeO, respectively.

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Determination of refractive index and absorption coefficient of iron- oxide-bearing slags

Cited by 8 publications

References 9 publications

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Nepheline Crystallization in Nuclear Waste Glasses: Progress Toward Acceptance of High‐Alumina Formulations

Effect of Transition Metal Oxides on Radiative Heat Transfer through Mold Flux Film in Continuous Casting of Steel

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