Solubility behavior of quartz and corundum in supercritical water: A quantitative thermodynamic interpretation

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Description

Dissolution reaction equilibria for {alpha}-quartz (SiO{sub 2}) and corundum ({alpha}-Al{sub 2}0{sub 3}) in pure, supercritical water are quantified using a density-dependent thermodynamic model. The database of existing solubility literature for {alpha}-quartz (0.2-10 kb, 200--575{degrees}C) is shown to be consistent with the presence of two hydrolyzed SI(IV) ion forms: Si(OH){sub 4}(aq) and Si{sub 2}O(OH){sub 6}(aq); the corundum database (1-20 kb, 400--700{degrees}C) is consistent with Al(OH){sub 3}(aq) and Al(OH){sub 4}{sup {minus}}. A third Si(IV) ion hydroxocomplex, Si{sub 2}O{sub 2}(OH){sub 5}{sup {minus}}, is indicated at lower pressures (0.03-0.10 kb). The characteristic sigmoidal nature of the solubility isobars is explained by dimerization of Si(OH){sub ... continued below

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28 p.

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Ziemniak, S.E. May 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 17 times . More information about this report can be viewed below.

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  • Knolls Atomic Power Laboratory
    Publisher Info: Knolls Atomic Power Lab., Schenectady, NY (United States)
    Place of Publication: Schenectady, New York

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Description

Dissolution reaction equilibria for {alpha}-quartz (SiO{sub 2}) and corundum ({alpha}-Al{sub 2}0{sub 3}) in pure, supercritical water are quantified using a density-dependent thermodynamic model. The database of existing solubility literature for {alpha}-quartz (0.2-10 kb, 200--575{degrees}C) is shown to be consistent with the presence of two hydrolyzed SI(IV) ion forms: Si(OH){sub 4}(aq) and Si{sub 2}O(OH){sub 6}(aq); the corundum database (1-20 kb, 400--700{degrees}C) is consistent with Al(OH){sub 3}(aq) and Al(OH){sub 4}{sup {minus}}. A third Si(IV) ion hydroxocomplex, Si{sub 2}O{sub 2}(OH){sub 5}{sup {minus}}, is indicated at lower pressures (0.03-0.10 kb). The characteristic sigmoidal nature of the solubility isobars is explained by dimerization of Si(OH){sub 4}(aq) (at high densities) or the formation of anionic hydrolysis products, Si{sub 2}0{sub 2}(OH){sub 5}{sup {minus}} and Al(OH){sub 4}{sup {minus}}, in the low density region (p < 0.01 gm/cc). By means of the evaluated equilibria, thermochemical properties of Si{sub 2}O(OH){sub 6}(aq) and Si{sub 2}O{sub 2}(OH){sub 5}{sup {minus}} are made available for the first time.

Physical Description

28 p.

Notes

INIS; OSTI as DE95012294

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  • Other Information: PBD: May 1995

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  • Other: DE95012294
  • Report No.: KAPL--4790
  • Grant Number: AC12-76SN00052
  • DOI: 10.2172/69332 | External Link
  • Office of Scientific & Technical Information Report Number: 69332
  • Archival Resource Key: ark:/67531/metadc702733

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  • May 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 28, 2016, 6:55 p.m.

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Ziemniak, S.E. Solubility behavior of quartz and corundum in supercritical water: A quantitative thermodynamic interpretation, report, May 1, 1995; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc702733/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.