Borax and Sassolite Deposits

Garrett, Donald E.

doi:10.1016/b978-012276060-0/50003-6

Cited by 13 publications

(17 citation statements)

References 29 publications

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“…Unlike the borates, the silicates do not show such extreme dependence, and the composition of the materials is not that diverse. Speculatively, it can be explained by a significantly lower volatility of SiO 2 comparing to BO 3 . , We suggest that understanding of chemical trends can help us in predicting of the possible composition ranges of other oxo-silicate based actinide bearing compounds such as phases with Np(VI)/Np(V) and Pu(VI).…”

Section: Resultsmentioning

confidence: 93%

Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques

Kegler

Klepov

et al. 2018

Inorg. Chem.

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Two uranium and two thorium silicates were obtained using high temperature mixed fluxes methods. K(UO)SiO crystallizes in the P2/ c space group and contains open-branched sechser (six) single silicate chains, whereas K(UO)SiO crystallizes in the C2/ c space group and is built of unbranched achter (eight) silicate chains. The crystals of K(UO)SiO and K(UO)SiO are related by increasing U/Si molar ratios, and both structures contain the same secondary building units (SBUs), [USi] heptamers. The triangle diagram for all known A-UO-SiO phases demonstrates the high polymerization level of silicate groups in the system, which was compared with the family of A-UO-BO/BO compounds. For both thorium silicates, the transformation of KThSiO to KThSiO was found to be a factor of the reaction time. KThSiO crystallizes in the C2/ c space group and belongs to the NaSiSiO structure type. Its 3D framework consists of diorthosilicate SiO group and ThO octahedra. Noncentrosymmetric KThSiO crystallizes in the hexagonal P6 space group and adopts mineral wadeite-type structure based upon triorthosilicate SiO rings and ThO octahedra. The coordination environment of thorium for all existing oxo-anion compounds including B, Si/Ge, P/As, Cr/Mo/W, and S/Se/Te are summarized and analyzed. Additionally, spectroscopic properties of all novel materials have been studied.

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Section: Resultsmentioning

confidence: 93%

Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques

Kegler

Klepov

et al. 2018

Inorg. Chem.

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“…Sodium metaborate is a common raw material for chemical industries, used to produce, for example, sodium perborate tetrahydrate (NaBO 2 ·H 2 O 2 ·3H 2 O), , sodium borohydride (NaBH 4 ), − and photographic and textile chemicals . As the szaibelyite ore is mainly consisted of szajbelyite (Mg 2 (OH)[B 2 O 4 (OH)]), magnesite (MgCO 3 ), and lizardite (Mg 3 Si 2 O 5 (OH) 4 ), Na 2 CO 3 is obtained as a byproduct besides NaBO 2 .…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria of the NaOH–NaBO₂–Na₂CO₃–H₂O System at 30 °C, 60 °C, and 100 °C

2015

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Equilibrium data of the NaOH−NaBO 2 −Na 2 CO 3 −H 2 O quaternary system at 30°C, 60°C, and 100°C were measured by an isothermal method. The phase diagrams at 30°C and 100°C were constructed, and the crystallization zones were discussed. In the phase diagram, the quaternary system has two invariant points, five univariant curves, and four crystallization zones corresponding to NaBO 2 ·4H 2 O (NaBO 2 ·2H 2 O at 100°C), NaBO 2 ·2H 2 O (NaBO 2 ·1/3H 2 O at 100°C), Na 2 CO 3 · H 2 O, and NaOH·H 2 O (NaOH at 100°C). In addition, the solubility isotherms of NaBO 2 in Na 2 CO 3 -saturated NaOH solution and the solubility isotherms of Na 2 CO 3 in NaBO 2 -saturated NaOH solution were plotted. The solubility of Na 2 CO 3 in NaOH solution was compared with that in NaBO 2 -saturated NaOH solution. On the basis of the solubility data, a strategy for the effective separation of NaBO 2 and Na 2 CO 3 from the NaOH−NaBO 2 −Na 2 CO 3 −H 2 O quaternary system was proposed.

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“…30‐199), which is the crystalline form of B(OH) 3 . Previous reports regarding observation of sassolite was only from geological and mineralogical domain 23–26 . Observation of sassolite has been reported recently in the case of heat‐treated and highly phase‐separated lead borate glass also 27 .…”

Section: Resultsmentioning

confidence: 98%

Sassolite Formation in Glass Powders: A Novel Method to Study Phase Separation in Alkali Borosilicate Glass Compositions

Kumar

Shadiya

Sunny

et al. 2010

Journal of the American Ceramic Society

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This paper reports, for the first time, observation of sassolite (crystalline B(OH)3) formation in alkali borosilicate glass (BSG) powder due to hydration during aging. Correlation between hydration behavior, sassolite formation, and phase separation has been established and hydration‐resistant low‐alkali BSG powders were successfully prepared. The glass composition exhibited very low moisture absorption of <3 wt% in powder form, for an aging duration of 6000 h. This has been achieved by carefully tailoring the glass transition temperature (Tg) and critical immiscibility temperature (Tc). We also report a new, simple, and effective sample preparation method for detecting phase separation in BSG, using transmission electron microscopy.

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Borax and Sassolite Deposits

Cited by 13 publications

References 29 publications

Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques

Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques

Phase Equilibria of the NaOH–NaBO₂–Na₂CO₃–H₂O System at 30 °C, 60 °C, and 100 °C

Sassolite Formation in Glass Powders: A Novel Method to Study Phase Separation in Alkali Borosilicate Glass Compositions

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Borax and Sassolite Deposits

Cited by 13 publications

References 29 publications

Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques

Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques

Phase Equilibria of the NaOH–NaBO2–Na2CO3–H2O System at 30 °C, 60 °C, and 100 °C

Sassolite Formation in Glass Powders: A Novel Method to Study Phase Separation in Alkali Borosilicate Glass Compositions

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Phase Equilibria of the NaOH–NaBO₂–Na₂CO₃–H₂O System at 30 °C, 60 °C, and 100 °C