Thermodynamic Modeling of Savannah River Evaporators

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Description

A thermodynamic model based on the code SOLGASMIX is developed to calculate phase equilibrium in evaporators and related tank wastes at the Savannah River Site (SRS). This model uses the Pitzer method to calculate activity coefficients, and many of the required Pitzer parameters have been determined in the course of this work. Principal chemical species in standard SRS simulant solutions are included, and the temperature range for most parameters has been extended above 100 C. The SOLGASMIX model and calculations using the code Geochemists Workbench are compared to actual solubility data including silicate, aluminate, and aluminosilicate solutions. In addition, SOLGASMIX ... continued below

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68 pages

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Weber, C.F. August 2, 2001.

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Description

A thermodynamic model based on the code SOLGASMIX is developed to calculate phase equilibrium in evaporators and related tank wastes at the Savannah River Site (SRS). This model uses the Pitzer method to calculate activity coefficients, and many of the required Pitzer parameters have been determined in the course of this work. Principal chemical species in standard SRS simulant solutions are included, and the temperature range for most parameters has been extended above 100 C. The SOLGASMIX model and calculations using the code Geochemists Workbench are compared to actual solubility data including silicate, aluminate, and aluminosilicate solutions. In addition, SOLGASMIX model calculations are also compared to transient solubility data involving SRS simulant solutions. These comparisons indicate that the SOLGASMIX predictions closely match reliable data over the range of temperature and solution composition expected in the SRS evaporator and related tanks. Predictions using the Geochemists Workbench may be unreliable, due primarily to the use of an inaccurate activity coefficient model.

Physical Description

68 pages

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  • Other Information: PBD: 2 Aug 2001

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  • Report No.: ORNL/TM-2001/102
  • Grant Number: AC05-00OR22725
  • DOI: 10.2172/788505 | External Link
  • Office of Scientific & Technical Information Report Number: 788505
  • Archival Resource Key: ark:/67531/metadc721350

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  • August 2, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • March 30, 2016, 6:19 p.m.

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Weber, C.F. Thermodynamic Modeling of Savannah River Evaporators, report, August 2, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc721350/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.