Physical and Liquid Chemical Simulant Formulations for Transuranic Waste in Hanford Single-Shell Tanks

An Approach to Understanding Cohesive Slurry Settling, Mobilization, and Hydrogen Gas Retention in Pulsed Jet Mixed Vessels

“…As seen in the figure, the wt% UDS begins at 20%, which was the initial concentration of the uniform slurry and the increases during settling to about 38-wt% UDS over a 10-to 20-hr period. Rassat et al (2003b) give the following correlation for the shear strength of kaolin clay slurries shown in Figure 2.1.…”

“…Figure 2.2 reproduces gravity settling data for a 20-wt% kaolin slurry presented by Rassat et al (2003b). (a) This test was conducted in a 50-mL graduated centrifuge tube.…”

“…Tingey et al (2003) and Rassat et al (2003b) The original data were reported with the wt% of total solids, which includes dissolved salts, and Poloski et al (2006b) calculated the wt% UDS for each sample (for the sample identified by as the settled 1:1 dilution, the wt% UDS was not reported and has been calculated using the approach given by Poloski et al [2006b]). For slurries that settle, the wt% UDS will increase with settling, and, accordingly, the shear strength or Bingham yield stress will increase.…”

“…(a) This test was conducted in a 50-mL graduated centrifuge tube. Figure 2.2 also shows the wt% UDS determined from Equations 2.1 to 2.3 with the kaolin (ρ S = 2.65 g/mL) and water (ρ L = 0.998 g/mL) densities reported in Rassat et al (2003b). As seen in the figure, the wt% UDS begins at 20%, which was the initial concentration of the uniform slurry and the increases during settling to about 38-wt% UDS over a 10-to 20-hr period.…”

“…For solid and liquid densities, Cases 1 to 3 use the average liquid and solid densities of Hanford waste from Wells et al (2007): ρ L = 1.2 g/mL is the average liquid density, and ρ S = 2.8 g/mL is the average solid density. For slurries of kaolin in water, the densities given in Section 2.1.1 and reported by Rassat et al (2003b) are used (ρ S = 2.65 g/mL for kaolin, ρ L = 0.998 g/mL for water). Figure 2.6 shows the strength of layers as they settle for the three different cases and kaolin clay.…”