Improvement of a Bulk Optical Basicity Table for Oxidic Systems

Lebouteiller, A.; Courtine, P.

doi:10.1006/jssc.1997.7722

Cited by 115 publications

(98 citation statements)

References 23 publications

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“…Additionally, basicities calculated from electron density (Λ D ) (assuming the radius of oxygen is 1.40 Å), average electronegativity (Λ χav ) (assuming the EN of oxygen is χ LX = 3.758) (Zhao et al 2008a) and ionic-covalent parameter (Λ ICP ) (Lebouteiller and Courtine 1998) for a given coordination number (CN) are also shown. Yang and Somerville (Yang and Somerville 2001) previously recommended a set of values for these oxides, so the current recommended values (Λ rec ) (see below) are shown for comparison with the previous ones.…”

Section: B17 4) Ob From Some Other Methodsmentioning

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: B17 4) Ob From Some Other Methodsmentioning

confidence: 99%

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Rodriguez¹,

McCloy²,

Schweiger³

et al. 2011

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“…16) Optical basicity was preferred to conventional basicity index because this parameter takes into account all the chemical species constituting the slag and the basicity attitude of each one, thus this parameter appears a significant index for the slag characterization. Therefore, optical basicity could be a synthetic index with which characterize the releasing behavior of the slag.…”

Section: Methodsmentioning

confidence: 99%

Survey about Safe and Reliable Use of EAF Slag

Barella

Gruttadauria

Magni³

et al. 2012

ISIJ Int.

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The demand of green and recycling technology has become, nowadays, a crucial issue for the scientific community. In this work, a preliminary approach for safe and reliable "black slag" use is discussed on chemical and microstructural characterization basis. Different EAF slag types, coming from several steelmaking plants, are analyzed. The characterization is aimed to explain the diffusion, dissolution and releasing mechanisms of the polluting elements that affect the black slags and avoid their recycle as alternative filler materials. Furthermore, the work focuses on the leaching inhibition of these dangerous species in the environment.Experiments involve SEM-EDS and SEM-EBS analysis and elution tests, according to the UNI EN 12457 standard, on high FeO content slag, on slag featured by chromium high content and on slag with low FeO content. The analysis allows to recognize the phases responsible for the polluting elements releasing and to identify the phases to be promoted in order to obtain a safe and inert by-product.

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“…Updated oxide basicity values were also discussed by Lebouteiller and Courtine [51] and Duffy [52][53][54]. Oxide basicity values used in our calculations have been selected from these references [50][51][52][53][54], based on the most appropriate value for each constituent considering the oxidation state and average M A N U S C R I P T…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…Whilst theoretical optical basicity is, in many ways, equivalent to cation field strength index, multiple oxide basicity values are now available for some oxides (see [50][51][52][53][54]) and selecting the most appropriate values to use for a model of a particular system is not always clear -this may be one reason why a higher R 2 is provided here by the fit cation field strength index (Figure 1), compared with theoretical optical basicity ( Figure 2). …”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Modelling the sulfate capacity of simulated radioactive waste borosilicate glasses

Bingham

Vaishnav

Forder

et al. 2017

Journal of Alloys and Compounds

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(2017). Modelling the sulfate capacity of simulated radioactive waste borosilicate glasses. Journal of Alloys and Compounds, 695,[656][657][658][659][660][661][662][663][664][665][666][667]. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Copyright and re-use policy M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT

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Improvement of a Bulk Optical Basicity Table for Oxidic Systems

Cited by 115 publications

References 23 publications

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Survey about Safe and Reliable Use of EAF Slag

Modelling the sulfate capacity of simulated radioactive waste borosilicate glasses

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