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The Defense Waste Processing Facility (DWPF) began using Frit 418 with SB3 in early 2004. Additional Frit 418 was necessary to continue running, but a significant cost savings would be achieved if an interim frit could be used and the purchase of Frit 418 delayed until FY05. A large quantity of Frit 202 was available and it was proposed to use this material until additional Frit 418 was obtained. 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 Frit 202 on the melt rate of the SB3 system. Initial MRF testing indicated about a 20 percent decrease in melt rate when substituting Frit 202 for Frit 418. More recent tests with both the MRF and SMRF have shown a 10-35 percent decrease in rate using Frit 202. MRF testing indicated that the addition of sodium hydroxide would mitigate a majority of the melt rate loss associated with Frit 202. When NaOH was tested in the SMRF, the quantity that could be added was limited due to total organic carbon concerns from the additional formic acid required, to balance the hydroxide addition. SMRF testing with NaOH showed no increase in melt rate, but the NaOH addition was only 58 percent of that used in the dry feed test. No major processing problems were indicated when testing Frit 202, but the feed does have a greater tendency to mound than feeds using Frit 418, when tested in the SMRF. Samples taken from the top of the melter after idling overnight reveal the presence of a foamy layer of glass similar to previous runs with Frit 418

THE IMPACT OF FRIT 202 ON MELT RATE FOR THE SB3 FEED SYSTEM