HB-Line Dissolution of Glovebox Floor Sweepings

PDF Version Also Available for Download.

Description

Two candidate flowsheets for dissolving glovebox floor sweepings in the HB-Line Phase I geometrically favorable dissolver have been developed.Dissolving conditions tested and modified during the laboratory program were based on the current processing scheme for dissolving high-fired Pu-238 oxide in HB-Line. Subsequent adjustments made to the HB-Line flowsheet reflected differences in the dissolution behavior between high-fired Pu-238 oxide and the MgO sand/PuF{sub 4}/PuO{sub 2} mixture in glovebox floor sweepings. Although both candidate flowsheets involved two separate dissolving steps and resulted incomplete dissolution of all solids, the one selected for use in HB-Line will require fewer processing operations and resembles the ... continued below

Physical Description

11 p.

Creation Information

Gray, J.H. February 1, 1998.

Context

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. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

  • Gray, J.H. Westinghouse Savannah River Company, AIKEN, SC (United States)

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

Two candidate flowsheets for dissolving glovebox floor sweepings in the HB-Line Phase I geometrically favorable dissolver have been developed.Dissolving conditions tested and modified during the laboratory program were based on the current processing scheme for dissolving high-fired Pu-238 oxide in HB-Line. Subsequent adjustments made to the HB-Line flowsheet reflected differences in the dissolution behavior between high-fired Pu-238 oxide and the MgO sand/PuF{sub 4}/PuO{sub 2} mixture in glovebox floor sweepings. Although both candidate flowsheets involved two separate dissolving steps and resulted incomplete dissolution of all solids, the one selected for use in HB-Line will require fewer processing operations and resembles the initial flowsheet proposed for dissolving sand, slag, and crucible material in F-Canyon dissolvers. Complete dissolution of glovebox floor sweepings was accomplished in the laboratory by initially dissolving between 55 and 65{degree} in a 14 molar nitric acid solution. Under these conditions, partial dissolution of PuF{sub 4} and complete dissolution of PuO{sub 2} and MgO sand were achieved in less than one hour. The presence of free fluoride in solution,uncomplexed by aluminum, was necessary for complete dissolution of the PuO{sub 2}.The remaining PuF{sub 4} dissolved following addition of aluminum nitrate nonahydrate (ANN) to complex the fluoride and heating between 75 and 85{degree}C for an additional hour. Precipitation of magnesium and/or aluminum nitrates could occur before, during, and after transfer of product solutions. Both dilution and/or product solution temperature controls may be necessary to prevent precipitation of these salts. Corrosion of the dissolver should not be an issue during these dissolving operations. Corrosion is minimized when dissolving at 55-65{degree}C for one to three hours at a maximum uncomplexed free fluoride concentration of 0.07 molar and by dissolving at 75-85{degree}C at a one to one aluminum to fluoride mole ratio for another one to three hours.Generation of hydrogen caused by the dissolution of calcium metal should also not be a concern.No hydrogen was detected in the laboratory off-gas stream and insignificant metals of any kind are present in glovebox floor sweepings. Glovebox floor sweepings are generated at Savannah River in FB-Line during preparation of the feed material used in the metal producing bomb reduction process. It is usually after precipitation and during drying or conversion of plutonium fluoride to a PuF{sub 4}-PuO{sub 2} mixture at 500{degree}C, that spil occur which can contaminate the converted cake with varying amounts of MgO sand or other glovebox materials. This contaminated converted cake mixture of PuF{sub 4} and PuO{sub 2} is packaged and stored in the vault fo eventual recovery of the plutonium.In the past, most recovery operations in HB-Line have dealt with PuO{sub 2} as the only plutonium compound present in the material to be dissolved. However,since the plutonium in FB-Line glovebox floor sweepings is a mixture of plutonium fluoride (PuF{sub 4}) and plutonium oxide (PuO{sub 2}), the standar HB-Line dissolving flowsheet is not directly suitable for complete dissolution.This is because it is difficult to completely dissolve PuO{sub 2} when the fluoride is complexed with aluminum and it is difficult to completely dissolve PuF{sub 4} unless sufficient aluminum is present to complex free fluoride. These observations were previously confirmed during the initial flowsheet development work for dissolving sand, slag, and crucible materials in F-Canyon dissolvers.

Physical Description

11 p.

Notes

INIS; OSTI as DE98052825

Source

  • Other Information: PBD: Feb 1998

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE98052825
  • Report No.: WSRC-TR--98-00029
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/644591 | External Link
  • Office of Scientific & Technical Information Report Number: 644591
  • Archival Resource Key: ark:/67531/metadc692928

Collections

This report is part of the following collection of related materials.

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.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • February 1, 1998

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

Description Last Updated

  • Feb. 9, 2016, 5:50 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 5

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Gray, J.H. HB-Line Dissolution of Glovebox Floor Sweepings, report, February 1, 1998; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc692928/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.