Feed Preparation for Source of Alkali Melt Rate Tests

Stone, M. E. ; Lambert, D. P.

Savannah River Site (S.C.)

关键词: Evaporators;    Sludges;    Radioactive Waste Processing;    Hydroxides;    Radioactive Wastes;   

DOI  :  10.2172/881519
RP-ID  :  WSRC-TR-2005-00080
RP-ID  :  DE-AC09-96SR18500
RP-ID  :  881519

美国|英语

来源: UNT Digital Library

【 摘 要 】

The purpose of the Source of Alkali testing was to prepare feed for melt rate testing in order to determine the maximum melt-rate for a series of batches where the alkali was increased from 0% Na{sub 2}O in the frit (low washed sludge) to 16% Na{sub 2}O in the frit (highly washed sludge). This document summarizes the feed preparation for the Source of Alkali melt rate testing. The Source of Alkali melt rate results will be issued in a separate report. Five batches of Sludge Receipt and Adjustment Tank (SRAT) product and four batches of Slurry Mix Evaporator (SME) product were produced to support Source of Alkali (SOA) melt rate testing. Sludge Batch 3 (SB3) simulant and frit 418 were used as targets for the 8% Na{sub 2}O baseline run. For the other four cases (0% Na{sub 2}O, 4% Na{sub 2}O, 12% Na{sub 2}O, and 16% Na{sub 2}O in frit), special sludge and frit preparations were necessary. The sludge preparations mimicked washing of the SB3 baseline composition, while frit adjustments consisted of increasing or decreasing Na and then re-normalizing the remaining frit components. For all batches, the target glass compositions were identical. The five SRAT products were prepared for testing in the dry fed melt-rate furnace and the four SME products were prepared for the Slurry-fed Melt-Rate Furnace (SMRF). At the same time, the impacts of washing on a baseline composition from a Chemical Process Cell (CPC) perspective could also be investigated. Five process simulations (0% Na{sub 2}O in frit, 4% Na{sub 2}O in frit, 8% Na{sub 2}O in frit or baseline, 12% Na{sub 2}O in frit, and 16% Na{sub 2}O in frit) were completed in three identical 4-L apparatus to produce the five SRAT products. The SRAT products were later dried and combined with the complementary frits to produce identical glass compositions. All five batches were produced with identical processing steps, including off-gas measurement using online gas chromatographs. Two slurry-fed melter feed batches, a 4% Na{sub 2}O in frit run (less washed sludge combined with frit with less Na) and a 12% Na{sub 2}O in frit run (more washed sludge combined with frit with more Na), were produced for the SMRF targeting glasses that were identical in composition. These batches were duplicates of two smaller batches which were prepared for the dry fed melt-rate testing. Four process simulations were completed in two identical experimental 22-L apparatus to produce these two melter feed batches. Both melter feed batches were produced as planned. The targeted solids content for both batches was 50-wt%.