The Impact of Feed Preparation Acid Stoichiometry and Redox on Melt Rate for the SB3-Frit 418 Feed System
Batch 2 (SB2) and Sludge Batch 3 (SB3), and implemented a frit change from Frit 320 to Frit 418This blended sludge batch has been designated SB3 although previously SRNL has called this new sludge batch SB2/3. A series of dry-fed tests (using the Melt Rate Furnace or MRF) and slurry fed tests (using the Slurry-Fed Melt Rate Furnace or SMRF) have been performed to investigate the effect of feed preparation acid stoichiometry and REDOX (Reduction/Oxidation) on the melt rate of the SB3 - Frit 418 system. With regards to acid stoichiometry, the current DWPF target of 155 gave a higher melt rate than the 185 when tested in the SMRF. This contradicted the MRF results for the first time that both melt systems were used to evaluate melt rate with various feeds. The SMRF results should be used as slurry-fed results are more representative of what would occur in the DWPF, especially since the variable tested did not change the final glass composition. With regard to changes in REDOX (0.0, 0.1, a nd 0.2), the MRF tests indicated no difference while the SMRF tests showed that melt rate was not negatively impacted until a REDOX below 0.1 was used. In addition, all SMRF acid stoichiometry and REDOX feeds tested were diluted from about 50 to 45 weight percent total solids after melt rates had been determined at 50 weight percent. In all cases the lower weight percent solids resulted in lower melt rates. Based on this testing, the Immobilization Technology Section (ITS) recommends that the DWPF continue to operate the feed preparation processing for SB3 with Frit 418 with a targeted acid stoichiometry of 155 and a targeted REDOX of 0.2. If needed for other process concerns, REDOX targets approaching 0.1 could be used at DWPF before melt rate would be negatively impacted. Because all of this testing was performed on small-scale equipment with dried or slurred, nonradioactive simulant, the exact impact of feed acid stoichiometry and REDOX on the radioactive sludge in a DWPF-sized melter could not be quantified.
- Research Organization:
- Savannah River Site (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC09-96SR18500
- OSTI ID:
- 833413
- Report Number(s):
- WSRC-TR-2004-00350
- Country of Publication:
- United States
- Language:
- English
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