Radionuclide Leaching from Residual Solids Remaining after Acid Dissolution of K East Area Sludge Composite

Validation Testing of the Nitric Acid Dissolution Step Within the K Basin Sludge Pretreatment Process

“…Because of these findings, the concentrations of plutonium found in the various residual solids produced from acid treatment and leaching tests of K Basin sludge were plotted as a function of plutonium concentration in the associated supernatant solutions (Figure 4.7). All plutonium solid/solution data available from nitric acid processing tests of K Basin sludge were used to prepare Figure 4.7 (Carlson et al 1998a,~Makenas 1999Delegard et al 1998a, @ and the present validation testing). , leaching time (4 to 24 hr), leach temperature (25°C to boiling), and solid/liquid separation and rinsing technique (filtration/washing, centrifuge/decant) used in the testing.…”

Radionuclide Leaching from Residual Solids Remaining after Acid Dissolution of Composite K East Canister Sludge

“…In previous tests on composite KE Basin floor and Weasel Pit sludge residue, four candidate Ieachants were tested. The leachant most successful in solubilizing the radioelements of interest was found to be 6~HN03/0.3~hydrofluoric acid (I-IF) (Delegard et al 1998). This leachant therefore was used in the present tests with the canister sludge residue.…”