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Sunday, August 2, 2020 | History

2 edition of Thermodynamic properties of molten cryolite and other fluoride mixtures. found in the catalog.

Thermodynamic properties of molten cryolite and other fluoride mixtures.

Jan LuМ€tzow Holm

Thermodynamic properties of molten cryolite and other fluoride mixtures.

by Jan LuМ€tzow Holm

  • 125 Want to read
  • 22 Currently reading

Published by Norges Tekniske Høgskole, Institutt for uorganisk kjemi in [Trondheim] .
Written in English

    Subjects:
  • Fluorides.,
  • Cryolite.,
  • Fused salts.,
  • Mixtures.,
  • Thermochemistry.

  • Classifications
    LC ClassificationsQD181.F1 H63
    The Physical Object
    Pagination172 p.
    Number of Pages172
    ID Numbers
    Open LibraryOL5089671M
    LC Control Number74161105

    The location of the cryolite^silica eutectic on the cryolite side of the phase diagram is in contrast to other cryolite^silicate systems (Rutlin, ; Rutlin & Grande, ). The present. Fluxes based on a KCl-NaCl mixture may be used to cover and protect the metal from oxidation. To recover aluminum from drosses, a more reactive flux containing cryolite or some other fluoride may be used. In this article, the thermodynamics of aluminum melting and refining are analyzed in terms of the behavior of sodium, magnesium, and calcium.

    may contribute to deeper understanding of thermodynamic properties of cryolite-based melts. Experimental For preparation of samples following chemicals were used. Cryolite, Na3AlF6 of anal, grade (Merck), lithium fluoride and sodium fluoride of anal, grade (Lachema, Brno), A1F3 sublimated ( %) and aluminium of purity %.   The traditional electrolyte for aluminum electrolysis is composed of molten cryolite (Na3AlF6) and alumina (Al2O3). One of the objectives of the industry is to lower the operating temperature of the electrolytic process, which is currently around °C. The benefits commonly evoked of a temperature decrease in the aluminum plotlines are multiple: reduction of the energetic .

      Raman spectra of aluminum fluoride containing melts and the ionic equilibrium in molten cryolite type mixtures B. Gilbert, G. Mamantov, G. M. Begun The .   Partial properties of the other component salts were calculated by applying the Gibbs-Duhem equation to the analytical formulation of the excess partial molar properties for MgCl 2 This The predicted molten salt mixtures were further analyz more. Source. hydrogen fluoride and hydrogen dissolutions in cryolite-base molten salts, which.


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Thermodynamic properties of molten cryolite and other fluoride mixtures by Jan LuМ€tzow Holm Download PDF EPUB FB2

Thermodynamic properties of molten cryolite and other fluoride mixtures Norges Tekniske Hogskole, Institutt for uorganisk kjemi [Trondheim] Wikipedia Citation Please see Wikipedia's template documentation for further citation fields that may be required. THE SURFACE PROPERTIES OF SODIUM OF MOLTEN MIXTURES FLUORIDE, AND ALUMINIUM FLUORIDE ALUMINA H.

BLOOM and. BURROWS Chemistry Department, The University of Tasmania Hobart, Tasmania, Australia Abstract -- From the investigation of its physical properties, cryolite or NagAlF^ is thought to exist in the molten state as the ions Na"^, A 1 F ^ ~ and A l F f Author: H.

Bloom, B.W. Burrows. Phase relations and thermodynamic properties in the ternary reciprocal system LiF NaF Na 3 AlF 6 Li 3 AlF 6. It is shown that molten mixtures in this system can be treated as consisting of the following species: Li +, Na Thermodynamic Properties of Cryolite znd Other Fluoride Mixtures, Dr.

Thesis, The University of Trondheim, NTH Cited by: A Soft-Sphere Equation of State for the calculation of the thermodynamic properties of molten fluoride salt mixtures is presented. The mixtures considered were binary mixtures of beryllium.

Molecular dynamics (MD) simulation is a useful tool for the thermodynamic analysis of molten alkali halide mixtures that are completely ionic and do not undergo an oxidation/reduction reaction.

The behavior of a solute in a diluted solution can be analyzed by MD using a larger number of atoms in a system than the limited number of atoms Author: Y. Sekiguchi, K. Uozumi, K. Kawamura, T.

Terai. The structure of molten aluminum fluoride−alkali fluoride mixtures has been investigated by Raman spectroscopy at −°C using a captive liquid windowless cell. Changes in spectra with temperature and melt composition reflect an equilibrium between the species AlF 4 − and AlF 6 3−.Complete spectrum of the AlF 6 3− was obtained confirming an octahedral coordination; the.

The structure of molten aluminum fluoride−alkali fluoride mixtures has been investigated by Raman spectroscopy at −°C using a captive liquid windowless cell.

In this study all the fluoride systems from the primary choices in Table 1 except the LiF–NaF–BeF 2 –AnF 3 system are discussed with the emphasis on their thermal properties. The LiF–NaF–BeF 2 –AnF 3 system has been excluded from this study due to the lack of the experimental data.

Further measurements and modelling is required here. However the first suggestion for a. Thermodynamic Properties of Molten Cryolite and Other Fluoride Mixtures, Institute of Inorganic Chemistry, The University of Trondheim, NTH, Norway, Trondheim (), p.

80 [3] I. Koštenská, M. Malinovský. This paper presents a quantitative thermodynamic description for water, hydrogen fluoride and hydrogen dissolutions in cryolite-base molten salts, which is of technological importance to the Hall–Héroult electrolytic aluminum extraction cell.

The Modified. Thermodynamic Properties of Molten Cryolite and Other Fluoride Mixtures, Institute of Inorganic Chemistry, The University of Trondheim, NTH, Norway, Trondheim (), p. 80 7 J. Gabčová, P. Fellner. Holm:Thermodynamic Properties of Molten Cryolite and Other Fluoride Mixtures, The University of Trondheim, NTH, Norway, Google Scholar 3.

Thermodynamic and structural properties of some mixtures of molten fluorides. Electrochimica Acta11 (3), DOI: /(66) Kenji Ono, Tomoo Matsushima, Tsutomu Ito.

Study on the Reaction between Aluminum and Sodium Fluoride. Thermodynamic modeling of high temperature (HT) stable molten salt mixtures: higher order carbonate-fluoride systems was completed • determination ofmelting points higher order carbonate-fluoride systems was completed • Thermal stabilities of HT molten salt systems were determined • Thermal conductivities of HT molten salt systems were.

Molten Salt Transport Number Molten Aluminum Calcium Fluoride Kvande, Halvor, Thermodynamics of the system: NaF-AIF 3-AI 2 O 3-AI studied by vapor pressure measurements, Holm, J.L., Thermodynamic Properties of Molten Cryolite and Other Fluoride Mixtures, Dr.

Techn. DissertationThe University of Trondheim, Norway. Thermodynamic properties of some molten alkaline fluoride—beryllium fluoride mixtures* J.

HOLM Institute of Physical Chemistry, The University of Trondheim, N- Trondheim, NTH, Norway Received 9 March The enthalpies of fusion of both Li. from book Essential Readings in Light Metals: Thermodynamic Properties of Molten Cryolite and other Fluoride Mixtures. Thermodynamics of molten mixtures of Na3AlF6-Al2O3 and NaF-AlF3.

Calculation of thermodynamic properties of LiF AlF3, NaF AlF3 and KF AlF3. Calphad25 (1), DOI: /S(01) M. Bruno, J.L.

Holm. New enthalpy data on the formation of some solid and liquid phases in (sodium fluoride+ aluminium fluoride). However, an investigation of the physical-chemical and thermodynamic properties of molten systems based on cryolite could also be of interest for other processes, especially the electrolytic.

Although sodium ions carry the current through the bath, the cathode reaction extracts aluminum and leaves at the interface a melt that is richer in sodium fluoride and therefore has a higher liquidus temperature (melting point) than the bulk.

The anode reaction produces aluminum fluoride at the anode — bath interface. The refractory material of choice for aluminum cell bottom linings worldwide is alumino-silicates, due to high availability, relatively low cost, and empirically good performance.

During operation of aluminum electrolysis cells, the alumino-silicates are subjected to infiltration and attack by molten electrolyte components. The penetration of sodium and molten fluorides through the cathode.Tolerances with regional registration, as defined by section (n), are established for the combined residues of the insecticidal fluorine compounds, cryolite and synthetic cryolite (sodium aluminum fluoride), in or on the folowing raw agricultural commodities: kiwifruit, ppm.A Thermodynamic Approach to the Corrosion of the Cathode Refractory Lining in Aluminium Electrolysis Cell: Modelling of the Al2O3-Na2O-SiO2-AlF3-NaF-SiF4 System.

, DOI: /_ Dario Corradini, Paul A. Madden, Mathieu Salanne. Coordination numbers and physical properties in molten salts and their mixtures.