Nickel(II) Oxide Solubility and Phase Stability in High Temperature Aqueous Solutions

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Description

A platinum-lined, flowing autoclave facility was used to investigate the solubility behavior of nickel(II) oxide (NiO) in deoxygenated ammonium and sodium hydroxide solutions between 21 and 315 C. Solubilities were found to vary between 0.4 and 400 nanomolal (nm). The measured nickel ion solubilities were interpreted via a Ni(II) ion hydroxo- and amino-complexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. Two solid phase transformations were observed: at temperatures below 149 C, the activity of Ni(II) ions in aqueous solution was controlled by a hydrous Ni(II) oxide (theophrastite) solid phase rather than ... continued below

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1351 Kilobytes pages

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Ziemniak, S.E. & Goyette, M.A. March 17, 2003.

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  • Lockheed Martin
    Publisher Info: Lockheed Martin Corporation, Schenectady, NY 12301 (United States)
    Place of Publication: Schenectady, New York

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Description

A platinum-lined, flowing autoclave facility was used to investigate the solubility behavior of nickel(II) oxide (NiO) in deoxygenated ammonium and sodium hydroxide solutions between 21 and 315 C. Solubilities were found to vary between 0.4 and 400 nanomolal (nm). The measured nickel ion solubilities were interpreted via a Ni(II) ion hydroxo- and amino-complexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. Two solid phase transformations were observed: at temperatures below 149 C, the activity of Ni(II) ions in aqueous solution was controlled by a hydrous Ni(II) oxide (theophrastite) solid phase rather than anhydrous NiO (bunsenite); above 247 C, Ni(II) activities were controlled by cubic rather than rhombohedral bunsenite.

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1351 Kilobytes pages

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INIS; OSTI as DE00821370

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  • Other Information: PBD: 17 Mar 2003

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  • Report No.: LM-03K028
  • Grant Number: AC12-00SN39357
  • DOI: 10.2172/821370 | External Link
  • Office of Scientific & Technical Information Report Number: 821370
  • Archival Resource Key: ark:/67531/metadc736130

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  • March 17, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 28, 2016, 8:52 p.m.

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Ziemniak, S.E. & Goyette, M.A. Nickel(II) Oxide Solubility and Phase Stability in High Temperature Aqueous Solutions, report, March 17, 2003; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc736130/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.