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Glass Frit Clumping And Dusting

Description: DWPF mixes a slurry of glass frit (Frit 418) and dilute (1.5 wt%) formic acid solution with high level waste in the Slurry Mix Evaporator (SME). There would be advantages to introducing the frit in a non-slurry form to minimize water addition to the SME, however, adding completely dry frit has the potential to generate dust which could clog filters or condensers. Prior testing with another type of frit, Frit 320, and using a minimal amount of water reduced dust generation, however, the formation of hard clumps was observed. To examine options and behavior, a TTQAP [McCabe and Stone, 2013] was written to initiate tests that would address these concerns. Tests were conducted with four types of glass frit; Frit 320, DWPF Frit 418, Bekeson Frit 418 and Multi-Aspirator Frit 418. The last two frits are chemically identical to DWPF Frit 418 but smaller particles were removed by the respective vendors. Test results on Frit Clumping and Dusting are provided in this report. This report addresses the following seven questions. Short answers are provided below with more detailed answers to follow. 1. Will the addition of a small amount of water, 1.5 wt%, to dry DWPF Frit 418 greatly reduce the dust generation during handling at DWPF? a. Yes, a small scale test showed that adding a little water to the frit greatly reduced dust generation during handling. 2. Will the addition of small amounts of water to the frit cause clumping that will impair frit handling at DWPF? a. No, not with Frit 418. Although clumps were observed to form when 1.5 wt% water was mixed with DWPF Frit 418, then compressed and air-dried overnight, the clumps were easily crushed and did not form the hardened material noted when Frit 320 was tested. 3. What is the measured size ...
Date: September 26, 2013
Creator: Steimke, J. L.
Partner: UNT Libraries Government Documents Department

Key results from SB8 simulant flowsheet studies

Description: Key technically reviewed results are presented here in support of the Defense Waste Processing Facility (DWPF) acceptance of Sludge Batch 8 (SB8). This report summarizes results from simulant flowsheet studies of the DWPF Chemical Process Cell (CPC). Results include: Hydrogen generation rate for the Sludge Receipt and Adjustment Tank (SRAT) and Slurry Mix Evaporator (SME) cycles of the CPC on a 6,000 gallon basis; Volume percent of nitrous oxide, N2O, produced during the SRAT cycle; Ammonium ion concentrations recovered from the SRAT and SME off-gas; and, Dried weight percent solids (insoluble, soluble, and total) measurements and density.
Date: April 26, 2013
Creator: Koopman, D. C.
Partner: UNT Libraries Government Documents Department

A Statistical Review of Composition Data from DWPF's Process Samples for Macro-Batch 1

Description: The measurements derived from samples taken during the processing of macro-batch 1 (MB1) at the Defense Waste Processing Facility (DWPF) have been reviewed and compared in this report. Batches 22 through 93 were the focal point of this study. Statistical control charts were developed for each analyte for each vessel to identify influential or exceptional results in the variation, central tendency, or both for the measurements. These charts should serve as a basis for observing the (expected) impact of some decisions made during the processing of this macro-batch.
Date: January 16, 2001
Creator: Edwards, T.B.
Partner: UNT Libraries Government Documents Department

A Summary of Rheology Data For SB3 and SB2/3 Blend Simulant Savannah River Site Wastes

Description: The purpose of this study was to document the rheological measurements made for Sludge Batch 3 (SB3) and the blend of SB3 with Sludge Batch 2 (SB2). These measurements were primarily made on Slurry Mix Evaporator (SME) products, i.e. melter feeds. Some measurements were made on SB2/3 blend Sludge Receipt and Adjustment Tank (SRAT) products. Measurements on radioactive SB3 and SB2/3 samples have been limited to sludge characterization. SB2/3 measurements studied the impact of changing the SRAT acid addition strategy on the SRAT and SME product rheology. SB2/3 measurements also studied the impact of changing the waste loading target (sludge oxides content in glass) of the SME product. SB3 measurements studied the impact of changes in the wash end point and acid addition strategy on the SME product (melter feed) rheology. A summary of the significant findings is given below: SB3 radioactive sludge and blended SB2/3 radioactive sludge were less viscous than SB2 radioactive sludge. SB2/3 b lend sludge is more viscous than SB3 sludge. SB3 simulant SME product rheology was strongly impacted by changing the noble metal concentrations to more closely match those of the qualification sample. This reduction in noble metals produced a lower pH product that was also considerably less viscous. Increased acid addition in the SB2/3 SRAT generally led to less viscous simulant SRAT products. This trend did not persist in the SME products. SME products became more viscous when increased acid was used in the SRAT cycle from 135 per cent up to 170 per cent of stoichiometry, then became less viscous as total acid was increased further to 185 per cent. A significant increase in hydrogen generation occurred between 170 per cent and 185 per cent. The impact of acid addition on SB3 SME products was also variable. The impact of waste loading changes ...
Date: March 1, 2004
Partner: UNT Libraries Government Documents Department

Implication of the Statistical Review of the Side By-Side Comparison of DWPF's ICPS

Description: The Statistical Consulting Section (SCS) of the Savannah River National Laboratory received data from a series of side-by-side comparisons of two Inductively Coupled Plasma-Atomic Emission Spectrometers (ICPs) conducted by the Defense Waste Processing Facility Laboratory of Waste Laboratory Services. These two ICPs are designated as M-14, the current production ICP, and M-13, the new ICP being evaluated. The data received by SCS were outlined in the test plan [1] describing the series of tests, which involved three sample preparation methods, denoted as: ''cold chem,'' fusion, and mixed acid. A cold chemical (cold chem) preparation is used for samples of the Sludge Receipt and Adjustment Tank, SRAT, product. Fusion and mixed acid dissolutions are used to prepare samples of the Slurry Mix Evaporator, SME. For each of these three dissolution methods, several types of samples were prepared and measured (for chemical composition) by both ICPs. The samples included process samples (SRAT product for cold chem and SME product for fusion and mixed acid), blanks, check standards, and samples of the Analytical Reference Glass One, ARG-1. Groups of these samples were measured under 6 different calibrations of each of the two ICPs. The measurements of the process and ARG-1 samples were provided by element (16 elements in all) as weight percent concentrations. For these samples the elemental concentrations were converted to their corresponding oxide concentrations by using the appropriate gravimetric factors. In addition to these measurements, data associated with the determinations of the limit of detection, LOD, and limit of quantification, LOQ, for each element of interest for each ICP were provided to SCS.
Date: July 1, 2004
Partner: UNT Libraries Government Documents Department