Sludge Batch 4 Baseline Melt Rate Furnace and Slurry-Fed Melt Rate Furnace Tests With Frits 418 and 510 (U)

Sludge Batch 4: Model Based Assessments of the February 2007 Sludge Projection

“…As previously mentioned, Frit 503 (with 4% Na 2 O) was recommended for SB4 processing based on the June 2006 composition. This frit has been shown to improve melt rate over Frit 418, 425, and 320, even though the Na 2 O content is significantly lower (Smith et al (2006)). …”

“…The "Melt Rate" column represents an estimate of the anticipated melt rates for each system. These estimates are based on recent Melt Rate Furnace (MRF) and Slurry-Fed Melt Rate Furnace (SMRF) (Smith et al (2006) Those results indicated no significant differences in melt rate between Frit 418 and Frit 425 (11.5 g/min versus 11.6 g/min, respectively) while the higher B 2 O 3 based frit (Frit 503) showed a significant increase in melt rate (13.1 g/min).…”

“…In general, these frits have lower Na 2 O concentrations than the "sliding scale series" with the differences being accounted for by increases in Perhaps of most interest to SB4 is the Frit 503-m series (also shaded in Table 3-2). This series of frits was developed during the November 2006 SB4 assessments based on the preliminary melt rate information that suggested higher B 2 O 3 based frits could lead to higher melt rates (Smith et al (2006)). 4 That being said, the 503-m series is primarily based on a fixed B 2 O 3 content of 14% with varying Na 2 O concentrations (ranging from 4 -10 wt%) so the frit selection process can couple to the washing endpoint of the sludge, which plays a major role in determining the sludge Na 2 O content.…”

Accelerated Processing of SB4 and Preparation for SB5 Processing at DWPF

“…As an added benefit, increasing the B 2 O 3 concentration was also shown to have a positive impact on melt rate and throughput. 4 This finding was equally important since initial SB4 melt rate testing had little success in finding a frit that would provide melt rate that was considered acceptable for DWPF processing. 5,6 However, shortly after SRNL recommended the use of Frit 503, whoich appeared to have a throughput equivalent to that seen for the Sludge Batch 3 (SB3)-Frit 418 system 4 , the LWO had to change the final composition of SB4.…”

“…F rit 510 was subsequently tested in the SMRF and shown to have an increased throughput compared to the Frit 418 -SB4 system. 8 See Table I for the composition of the frits recommended for SB4 processing. Initial DWPF throughput with the SB4-Frit 418 system was slower than that seen for the SB3-Frit 418 system.…”