The combined effects of chlorine and fluorine on the viscosity of aluminosilicate melts

Zimova, M.; Webb, Sharon L.

doi:10.1016/j.gca.2006.12.002

Cited by 46 publications

(17 citation statements)

References 35 publications

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“…The reason that fluorine is effectively able to promote the formation of spinel is inferred that F atoms can increase the reaction activity of Al by breaking the Al-O-Si structure in the metakaolinite and can also increase the amount of liquid phases. [19][20][21] On the other hand, the reason that the K 2 O promotes the formation of mullite is believed that the K atoms are coordinated by non-bridging O (NBO) atoms in liquid phases, 22 which is beneficial to keep the liquid phases in amorphous state and increase the reaction activity of Si-O structure. Therefore, there is more mullite formed at 1100 • C when the potassium fluoride is used as a mineralizer in the sample KF.…”

Section: Methodsmentioning

confidence: 99%

Effects of different potassium salts on the formation of mullite as the only crystal phase in kaolinite

Lin

et al. 2009

Journal of the European Ceramic Society

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Section: Methodsmentioning

confidence: 99%

Effects of different potassium salts on the formation of mullite as the only crystal phase in kaolinite

Lin

et al. 2009

Journal of the European Ceramic Society

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“…According to Sasaki et al 16,17) and Luth 15) at certain slag compositions when CaF2 substitutes CaO in calcium-silicate slags, F ions tends to bond with Ca ions and form loosely bonded Ca-F complexes and the formation of such complexes can inhibit the typical depolymerization role of CaF2 in slags. Work done by Zimova and Webb 27) showed an increase of viscosity with Cl addition in the Na2O-Fe2O3-Al2O3-SiO2 at certain compositions and indicated a polymerization of the melt with certain halide compound additions. Mysen et al 28) showed similar results of polymerization with fluorine additions to the meta-aluminous silicate glasses, where polymerization of the silicate network could occur by reactions previously described in reaction (6) and provided a simple reaction mechanism for polymerization when NaF is added to the Na2O-SiO2 slag system, which is described in reaction (7).…”

Section: Effect Of Caf2 On Hydrogen Solubility and Slagmentioning

confidence: 96%

Hydrogen Dissolution in the CaF2–CaO–SiO2 System

2011

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The hydrogen solubility in the CaF2-CaO-SiO2 slag system has been studied to identify and compare the hydrogen dissolution behavior according to basicity and CaF2 content at high temperature of 1 823 K. The hydrogen solubility typically increases with higher CaF2 content across the entire compositional range, but its effect is more pronounced at higher basicity. At low basicity, CaF2 seems to slightly polymerize the slag network increasing the available incorporation sites, where hydrogen can attach and increase hydrogen content in slag. At high basicity, the slag structure is already highly depolymerized and CaF2 addition does not affect the silicate structure, but likely affects the slag hydrogen solubility by lowering the hydroxyl activity. CaO additions lowered the hydrogen content in slag at low basicity and increased the hydrogen content in slag at high basicity. From the temperature dependence of the hydrogen solubility, the dissolution energy of hydrogen in slag was found to be 42.3 kcal/mol.

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“…Note the high values of standard errors (StEr) of the B i coefficient for F, a component present in a small fraction of <1 mass%; it was included in the influential component set because it has a strong ability to decrease melt viscosity [4,5]. According to the 2009 database [6], up to 0.06 mass% F was added to 926 glasses, of which 287 were analyzed, finding 43 to 120% F (94% average) of the nominal (batched) value; F was also found as an impurity in 50 glasses, to which it was not added as a component.…”

Section: Arrhenius Modelmentioning

confidence: 99%

High-temperature viscosity of many-component glass melts

Hrma

Kruger

2016

Journal of Non-Crystalline Solids

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In this article, we argue that 1) the activation energy for viscous flow becomes independent of temperature when the viscosity of molten glass is sufficiently low at high enough temperatures, such as those that exist in a glass-melting furnace, and 2) the intercept of the linear function ln versus T -1 ( is the viscosity and T is the temperature) is independent of glass composition. This hypothesis, which is hardly new and is well supported by experimental data, allows minimization of the number of fitting parameters. A new dataset of meticulously measured viscosities of a large composition region of simulated nuclear waste glasses that recently became available provided an excellent opportunity to test this hypothesis to verify it again. Also, we used this dataset to demonstrate that some popular functions designed for representing the high-viscosity segment (where the activation energy changes with temperature) are not recommendable for approximating the low-viscosity segment (where the activation energy is constant). Fitting such functions produces overparameterization and leads to physically meaningless (or at least aesthetically unsatisfactory) outcomes, or, if the functions are constrained by the glass-transition viscosity and the high-temperature asymptote, the result is a significant lack of fit.

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The combined effects of chlorine and fluorine on the viscosity of aluminosilicate melts

Cited by 46 publications

References 35 publications

Effects of different potassium salts on the formation of mullite as the only crystal phase in kaolinite

Effects of different potassium salts on the formation of mullite as the only crystal phase in kaolinite

Hydrogen Dissolution in the CaF2–CaO–SiO2 System

High-temperature viscosity of many-component glass melts

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