Using Aspen simulation package to determine solubility of mixed salts in TRU waste evaporator bottoms

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Nitric acid from plutonium process waste is a candidate for waste minimization by recycling. Process simulation software packages, such as Aspen, are valuable tools to estimate how effective recovery processes can be, however, constants in equations of state for many ionic components are not in their data libraries. One option is to combine single salt solubility`s in the Aspen model for mixed salt system. Single salt solubilities were regressed in Aspen within 0.82 weight percent of literature values. These were combined into a single Aspen model and used in the mixed salt studies. A simulated nitric acid waste containing mixed ... continued below

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32 p.

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Hatchell, J. L. March 1998.

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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 71 times . More information about this report can be viewed below.

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Description

Nitric acid from plutonium process waste is a candidate for waste minimization by recycling. Process simulation software packages, such as Aspen, are valuable tools to estimate how effective recovery processes can be, however, constants in equations of state for many ionic components are not in their data libraries. One option is to combine single salt solubility`s in the Aspen model for mixed salt system. Single salt solubilities were regressed in Aspen within 0.82 weight percent of literature values. These were combined into a single Aspen model and used in the mixed salt studies. A simulated nitric acid waste containing mixed aluminum, calcium, iron, magnesium and sodium nitrate was tested to determine points of solubility between 25 and 100 C. Only four of the modeled experimental conditions, at 50 C and 75 C, produced a saturated solution. While experimental results indicate that sodium nitrate is the first salt to crystallize out, the Aspen computer model shows that the most insoluble salt, magnesium nitrate, the first salt to crystallize. Possible double salt formation is actually taking place under experimental conditions, which is not captured by the Aspen model.

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32 p.

Notes

INIS; OSTI as DE98004252

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  • Waste management `98, Tucson, AZ (United States), 1-5 Mar 1998

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  • Other: DE98004252
  • Report No.: LA-UR--97-5161
  • Report No.: CONF-980307--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/653943 | External Link
  • Office of Scientific & Technical Information Report Number: 653943
  • Archival Resource Key: ark:/67531/metadc707651

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 25, 2016, 2:06 p.m.

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Hatchell, J. L. Using Aspen simulation package to determine solubility of mixed salts in TRU waste evaporator bottoms, report, March 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc707651/: accessed August 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.