Characterization and Aluminum Dissolution Demonstration With a 3 Liter Tank 51h Sample

Hay, Michael; Pareizs, J. M.; Bannochie, C. J.; Stone, M Michael; Click, D Damon; McCabe, D.

doi:10.2172/927899

Cited by 18 publications

(22 citation statements)

References 3 publications

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“…9 Figure 2 shows the change in chromium concentration during LTAD 12 and the lab-scale demonstration. 13 The laboratory scale demonstration suggests an increasing concentration, but LTAD showed no change. In fact, the chromium concentration initially decreased in proportion to the caustic addition due to dilution and then was stable for the entire process, thus, resulting in no change in total chromium in solution as shown in Table 3.…”

Section: Chromiummentioning

confidence: 99%

Evaluation of Low Temperature Aluminum Dissolution in Tank 51

Pike¹

2008

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DISCLAIMERThis work was prepared under an agreement with and funded by the U.S. Government. Neither the U. S. Government or its employees, nor any of its contractors, subcontractors or their employees, makes any express or implied: 1. warranty or assumes any legal liability for the accuracy, completeness, or for the use or results of such use of any information, product, or process disclosed; or 2. representation that such use or results of such use would not infringe privately owned rights; or 3. endorsement or recommendation of any specifically identified commercial product, process, or service. Any views and opinions of authors expressed in this work SUMMARYLiquid Waste Organization (LWO) identified aluminum dissolution as a method to mitigate the effect of having about 50% more solids in High Level Waste (HLW) sludge than previously planned. Previous aluminum dissolution performed in a HLW tank in 1982 was performed at approximately 85°C for 5 days, which became the baseline aluminum dissolution process. LWO initiated a project to modify a waste tank to meet these requirements.Subsequent to an alternative evaluation, LWO management identified an opportunity to perform aluminum dissolution on sludge destined for Sludge Batch 5, but within a limited window that would not allow time for any modifications for tank heating. A variation of the baseline process, dubbed Low Temperature Aluminum Dissolution (LTAD), was developed based on the constraint of available energy input in Tank 51 and the window of opportunity, but was not constrained to a minimum extent of dissolution, i.e. dissolve as much aluminum as possible within the time available. This process was intended to operate between 55 and 70°C, but for a significantly longer time than the baseline process. LTAD proceeded in parallel with the baseline project.The preliminary evaluation at the completion of LTAD focused on the material balance and extent of the aluminum dissolved. The range of values of extent of dissolution, 56% to 64%, resulted from the variation in liquid phase sample data available at the time. Additional solid phase data is available from a sample taken after LTAD to refine this range. This report provides additional detailed evaluation of the LTAD process based on analytical and field data and includes:• a summary of the process chronology,• a determination of an acceptable blending strategy for the aluminum-laden supernate stored in Tank 11, • an update to the determination of aluminum dissolved using more complete sample results, • a determination of the effect of LTAD on uranium, plutonium, and other metals, • a determination of the rate of heat loss from a quiescent tank, and • an evaluation of the aluminum dissolution rate model and actual dissolution rate.LTAD was successfully completed in Tank 51 with minimal waste tank changes. The following general conclusions may be drawn about the LTAD process:• Dissolution at about 60°C for 46 days dissolved 64% of the aluminum from the sludge slurry.• The aluminum-laden leach solution decan...

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Section: Chromiummentioning

confidence: 99%

Evaluation of Low Temperature Aluminum Dissolution in Tank 51

Pike¹

2008

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“…During the course of this study, the results of the 3L demonstration in the SRNL Shielded Cells facility showed that approximately 35% of the Al was removed after dissolution and washing. 1 This suggested that the SB5 composition would fall between Case B (25% Gibbsite) and Case C (50% Gibbsite). The data from the Shielded Cells demonstration were used to develop a revised projection, labeled Case F, which is given in Table 3-2.…”

Section: Objectivesmentioning

confidence: 99%

Sb5 With the Estimated Impact of Low Temperature Aluminum Dissolution: Preliminary Frits for Melt Rate Testing

Fox¹,

Edwards²

2008

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“…The Savannah River Site (SRS) Liquid Waste Organization (LWO) performed low-temperature Al-dissolution in Tank 51 to reduce the total mass of sludge solids and Al being fed to the DWPF. A radioactive demonstration using a 3 L Tank 51 sludge slurry sample was performed to verify the Tank Farm processing parameters [1].…”

Section: Introductionmentioning

confidence: 99%

Vitrification of High-Level Waste at the Savannah River Site

Fox

Peeler

2009

MRS Proc.

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The objective of this study was to experimentally measure the properties and performance of a series of glasses with compositions that could represent high level waste Sludge Batch 5 (SB5) as vitrified at the Savannah River Site Defense Waste Processing Facility. These data were used to guide frit optimization efforts as the SB5 composition was finalized. Glass compositions for this study were developed by combining a series of SB5 composition projections with a group of candidate frits. The study glasses were fabricated using depleted uranium and their chemical compositions, crystalline contents and chemical durabilities were characterized. Trevorite was the only crystalline phase that was identified in a few of the study glasses after slow cooling, and is not of concern as spinels have been shown to have little impact on the durability of high level waste glasses. Chemical durability was quantified using the Product Consistency Test (PCT). All of the glasses had very acceptable durability performance. The results of this study indicate that a frit composition can be identified that will provide a processable and durable glass when combined with SB5.

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Characterization and Aluminum Dissolution Demonstration With a 3 Liter Tank 51h Sample

Cited by 18 publications

References 3 publications

Evaluation of Low Temperature Aluminum Dissolution in Tank 51

Evaluation of Low Temperature Aluminum Dissolution in Tank 51

Sb5 With the Estimated Impact of Low Temperature Aluminum Dissolution: Preliminary Frits for Melt Rate Testing

Vitrification of High-Level Waste at the Savannah River Site

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