Vitrified metal finishing wastesI. Composition, density and chemical durability

Bingham, Paul A.; Hand, Russell J.

doi:10.1016/j.jhazmat.2004.11.014

Cited by 38 publications

(39 citation statements)

References 41 publications

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“…Fitted values of Center Shift (CS) and Quadrupole Splitting (QS), shown in Table 1 and Table 2, are similar to published values for other iron phosphate glasses [6], [7], [9], [10], [12], [13], [15], [17], [18], [20], [31] and [32] and are consistent with the conclusion that both Fe 2+ and Fe 3+ predominantly occupy a range of distorted octahedral sites in all of the modified iron phosphate glasses studied here. Sites with lower coordination numbers may also be present; however, the Mössbauer results indicate that their abundance is relatively low.…”

Section: Fe Mössbauer Spectroscopysupporting

confidence: 76%

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Bingham

Hand

Hannant

et al. 2009

Journal of Non-Crystalline Solids

168

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Modified iron phosphate glasses have been prepared with nominal molar compositions [(1−x)·(0.6P2O5-0.4Fe2O3)]·xRySO4, where x = 0-0.5 in increments of 0.1 and R = Li, Na, K, Mg, Ca, Ba, or Pb and y = 1 or 2. In most cases the vast majority or all of the sulfate volatalizes and quarternary P2O5-Fe2O3-FeO-RyOz glasses or partially crystalline materials are formed. Here we have characterized the structure, thermal properties, chemical durability and redox state of these materials. Raman spectroscopy indicates that increasing modifier oxide additions result in depolymerization of the phosphate network such that the average value of i, the number of bridging oxygens per -(PO4)-tetrahedron, and expressed as Q i , decreases. Differences have been observed between the structural effects of different modifier types but these are secondary to the amount of modifier added. Alkali additions have little effect on density; slightly increasing Tg and Td; increasing α and Tliq; and promoting bulk crystallization at temperatures of 600-700 °C.Additions of divalent cations increase density, α, Tg, Td, Tliq and promote bulk crystallization at temperatures of 700-800 °C. Overall the addition of divalent cations has a less deleterious effect on glass stability than alkali additions.57 FeMössbauer spectroscopy confirms that iron is present as Fe 2+ and Fe 3+ ions which primarily occupy distorted octahedral sites. This is consistent with accepted structural models for iron phosphate glasses. The iron redox ratio, Fe 2+/ΣFe, has a value of 0.13-0.29 for the glasses studied. The base glass exhibits a very low aqueous leach rate when measured by Product Consistency Test B, a standard durability test for nuclear waste glasses. The addition of high quantities of alkali oxide (30-40 mol% R2O) to the base glass increases leach rates, but only to levels comparable with those measured for a commercial soda-lime-silica glass and for a surrogate nuclear waste-loaded borosilicate glass. Divalent cation additions decrease aqueous leach rates and large additions (30-50 mol% RO) provide exceptionally low leach rates that are 2-3 orders of magnitude lower than have been measured for the surrogate waste-loaded borosilicate glass. The P2O5-Fe2O3-FeO-BaO glasses reported here show particular promise as they are ultra-durable, thermally stable, lowmelting glasses with a large glass-forming compositional range.

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Section: Fe Mössbauer Spectroscopysupporting

confidence: 76%

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Bingham

Hand

Hannant

et al. 2009

Journal of Non-Crystalline Solids

168

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“…Vitrification is an alternative of environmental remediation through the transformation of wastes to glass in order to stabilize their pollutant components because their constituents are bound in a glassy stable matrix [5,6]. Nevertheless, it is an expensive process that can usually only be applied if the obtained glass is reused in high-value applications [7].…”

Section: Introductionmentioning

confidence: 99%

Recycling of tailings from the Barruecopardo tungsten deposit for the production of glass

Alfonso

Castro

Garcı́a-Vallés

et al. 2016

J Therm Anal Calorim

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“…Chemical durability in contact with an aqueous solution is one of the most important properties for a nuclear waste form. Since the released actinides can form dissolved or colloidal radionuclide complexes by contacting and reacting with water, and it might finally extend to the biosphere by transportation with underground water flow [20,21]. Furthermore, the prevention of water ingression to the nuclear waste is extremely difficult, which may form water soluble salt and increase the leachability of certain species [22].…”

Section: Introductionmentioning

confidence: 99%

Phase evolution and chemical durability of co-doped Gd2Zr2O7 ceramics for nuclear waste forms

Fan

Shu

et al. 2015

Ceramics International

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Vitrified metal finishing wastesI. Composition, density and chemical durability

Cited by 38 publications

References 41 publications

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Effects of modifier additions on the thermal properties, chemical durability, oxidation state and structure of iron phosphate glasses

Recycling of tailings from the Barruecopardo tungsten deposit for the production of glass

Phase evolution and chemical durability of co-doped Gd2Zr2O7 ceramics for nuclear waste forms

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