Cobalt(II) Oxide Solubility and Phase Stability in Alkaline Media at Elevated Temperatures |
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| Authors: | S E Ziemniak M A Goyette K E S Combs |
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| Institution: | (1) Lockheed Martin Corporation, P. O. Box 1072, Schenectady, New York |
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| Abstract: | A platinum-lined, flowing autoclave facility was used to investigate the solubility behavior of cobalt(II) oxide (CoO) in deoxygenated ammonium and sodium hydroxide solutions between 22 and 288°C. Co(II) ion activity in aqueous solution was controlled by a hydrous Co(II) oxide when nitrogen was used for deoxygenation and by metallic cobalt when hydrogen was used. Measured cobalt solubilities are interpreted using a Co(II) ion hydroxo- and amminocomplexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. A common set of thermodynamic properties for the species Co(OH)+, Co(OH)2(aq) and Co(OH)(NH3)+ is provided to permit accurate cobalt oxide solubility calculations over broad ranges of temperature and alkalinity. |
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| Keywords: | Cobalt(II) oxide cobalt(II) hydroxide dehydration aqueous solutions cobalt(II) ion hydrolysis cobalt(II) ion– ammonia complexing equilibrium constant pressurized water hydrothermal reactions corrosion |
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