Electrical Conductivity of Cryolitic Melts

Wang, Xiangwen; Peterson, Ray D.; Tabereaux, Alton T.

doi:10.1007/978-3-319-48156-2_8

Cited by 13 publications

(12 citation statements)

References 7 publications

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“…The calculated density, total conductivity, and viscosity are compared to the critically assessed value (given in bracket next to the properties) of Robelin and Chartrand for density 35 and viscosity 36 and Wang et al for electrical conductivity. 37,38 Figure 1. Pairwise relationship between EMD calculations and critical assessments for density (a), ionic conductivity (b), and viscosity (c) for the 11 studied cryolitic melts at 1260 K. The critically assessed data are from refs, 35−38 respectively, for density, ionic conductivity, and viscosity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

First-Principles Determination of Transference Numbers in Cryolitic Melts

Gheribi

Salanne

Zanghi

et al. 2020

Ind. Eng. Chem. Res.

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The charge and electron transport properties of molten ionic systems are among the most relevant properties to consider in the control of several electrochemical processes.First-principles-based equilibrium molecular dynamics (EMD) can provide reliable predictions of both the total and partial charge transport properties. In this work we calculate the charge transport properties of the electrolytic bath (Na 3 AlF 6 -AlF 3 -Al 2 O 3 ) of the Hall-Héroult electrolysis cells. We predict both the individual and collective charge transport properties (total, partial conductivity and self diffusion coefficients) for 11 different compositions typical of industrial conditions via a series of EMD simulations.The predicted total and partial ionic conductivities and their composition dependence are compared to available experimental data. A good agreement is obtained for all studied compositions. From a more fundamental point of view, the microscopic aspect of the charge transport properties of cryolitic melts is discussed through its correlation to the local structure of different melts. Deviations between the calculated partial conductivities and those derived via the Nernst-Einstein approximation can be explained by the presence of strong short-range ordering within the melts.

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Section: ■ Results and Discussionmentioning

confidence: 99%

First-Principles Determination of Transference Numbers in Cryolitic Melts

Gheribi

Salanne

Zanghi

et al. 2020

Ind. Eng. Chem. Res.

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“…It needs to be inert in the melt, able to act as an electrical insulator at high temperatures, and maintain dimensional stability across a range of temperatures. Pyrolytic boron nitride (pBN) is a suitable material to meet this demand. − Because of the relatively high ionic conductivity of molten fluorides, a thin electrode positioned in a capillary should be used instead of a planar electrode. Polarization can be a major origin of error in the conductivity measurements, thus the alternating current method has been recognized to be preferable than the direct current method. ,− Nevertheless, the reliability of the particular experimental arrangement has to be thoroughly scrutinized throughout the attest with the melt with a known conductivity …”

Section: Methodsmentioning

confidence: 99%

Effect of the Alkaline Metal Cations on the Electrical Conductivity of the Molten Cryolites (K₃AlF₆, Rb₃AlF₆, and Cs₃AlF₆)

et al. 2020

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The electrical conductivity of molten K 3 AlF 6 , Rb 3 AlF 6 , Cs 3 AlF 6 , and CsF was measured at various temperatures using a pyrolytic boron nitride tube, platinum−rhodium alloy electrode, and alternating current impedance method. The electrical conductivity of molten K 3 AlF 6 was found to be 2.64 S•cm −1 at 1273 K. The electrical conductivity of molten Rb 3 AlF 6 was found to be 2.06 S•cm −1 at 1273 K. The conductivity of molten Cs 3 AlF 6 at the same temperature is 1.36 S•cm −1 because the conductivity of CsF at 1273 K was found to be 2.57 S•cm −1 . The electrical conductivity values steadily drop from lithium fluoride/fluoroaluminate through sodium and potassium to cesium fluoride/fluoroaluminate. This fall in conductivity is probably because of the increase in the size and mass of the cations (activation energy increases with decreasing conductivity).

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“…Our conductivity measurements were made with an apparatus and experimental method described in the literature. (Korenko et al, 2012;Fellner et al, 1993;Híveš et al, 1996;Kim and Sadoway, 1992;Wang et al, 1992) ).…”

Section: Conductance Of the Electrolytementioning

confidence: 99%

The thermal electrolytic production of Mg from MgO: A discussion of the electrochemical reaction kinetics and requisite mass transport processes

Leonard

Korenko

Larson

et al. 2016

Chemical Engineering Science

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Electrical Conductivity of Cryolitic Melts

Cited by 13 publications

References 7 publications

First-Principles Determination of Transference Numbers in Cryolitic Melts

First-Principles Determination of Transference Numbers in Cryolitic Melts

Effect of the Alkaline Metal Cations on the Electrical Conductivity of the Molten Cryolites (K₃AlF₆, Rb₃AlF₆, and Cs₃AlF₆)

The thermal electrolytic production of Mg from MgO: A discussion of the electrochemical reaction kinetics and requisite mass transport processes

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Electrical Conductivity of Cryolitic Melts

Cited by 13 publications

References 7 publications

First-Principles Determination of Transference Numbers in Cryolitic Melts

First-Principles Determination of Transference Numbers in Cryolitic Melts

Effect of the Alkaline Metal Cations on the Electrical Conductivity of the Molten Cryolites (K3AlF6, Rb3AlF6, and Cs3AlF6)

The thermal electrolytic production of Mg from MgO: A discussion of the electrochemical reaction kinetics and requisite mass transport processes

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Effect of the Alkaline Metal Cations on the Electrical Conductivity of the Molten Cryolites (K₃AlF₆, Rb₃AlF₆, and Cs₃AlF₆)