Effect of Phosphate, Fluoride, and Nitrate on Gibbsite Dissolution Rate and Solubility

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Laboratory tests have been completed with simulated tank waste samples to investigate the effects of phosphate, fluoride, and nitrate on the dissolution rate and equilibrium solubility of gibbsite in sodium hydroxide solution at 22 and 40{degrees}C. Results are compared to relevant literature data and to computer model predictions. The presence of sodium nitrate (3 M) caused a reduction in the rate of gibbsite dissolution in NaOH, but a modest increase in the equilibrium solubility of aluminum. The increase in solubility was not as large, though, as the increase predicted by the computer model. The presence of phosphate, either as sodium ... continued below

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Herting, Daniel L. January 29, 2014.

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  • Hanford Site (Wash.)
    Publisher Info: HNF (Hanford Site (HNF), Richland, WA (United States))
    Place of Publication: Richland, Washington

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Laboratory tests have been completed with simulated tank waste samples to investigate the effects of phosphate, fluoride, and nitrate on the dissolution rate and equilibrium solubility of gibbsite in sodium hydroxide solution at 22 and 40{degrees}C. Results are compared to relevant literature data and to computer model predictions. The presence of sodium nitrate (3 M) caused a reduction in the rate of gibbsite dissolution in NaOH, but a modest increase in the equilibrium solubility of aluminum. The increase in solubility was not as large, though, as the increase predicted by the computer model. The presence of phosphate, either as sodium phosphate or sodium fluoride phosphate, had a negligible effect on the rate of gibbsite dissolution, but caused a slight increase in aluminum solubility. The magnitude of the increased solubility, relative to the increase caused by sodium nitrate, suggests that the increase is due to ionic strength (or water activity) effects, rather than being associated with the specific ion involved. The computer model predicted that phosphate would cause a slight decrease in aluminum solubility, suggesting some Al-PO4 interaction. No evidence was found of such an interaction.

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  • Report No.: LAB-RPT--13-00011-Rev.0
  • Grant Number: DE-AC27-08RV14800
  • DOI: 10.2172/1119691 | External Link
  • Office of Scientific & Technical Information Report Number: 1119691
  • Archival Resource Key: ark:/67531/metadc868115

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  • January 29, 2014

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 31, 2016, 8:33 p.m.

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Herting, Daniel L. Effect of Phosphate, Fluoride, and Nitrate on Gibbsite Dissolution Rate and Solubility, report, January 29, 2014; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc868115/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.