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ii Executive Summary  iii Acknowledgments  vii Acronyms and Abbreviations  viii 1.0 Introduction  1 2.0 Quality Assurance 2 3.0 Background and Approach  3 4.0 Results and Discussion  5 4.1 Observations of Actual Tank Waste  5 4.1.1 Stepwise/Cascade Dissolution Tests and Other Tests at the 222-S Laboratory  6 4.1.2 Studies Performed in Support of WTP  9 4.2 Testing of Aluminum Phase Solubilities in Alkaline Solution  12 4.2.1 Gibbsite Solubility Equation after Misra  13 4.2.2 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO3 Solutions  14 4.2.3 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO3-NaF Solutions  15 4.2.4 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO3-Na3PO4-Na7F(PO4)2 Solutions  17 4.2.5 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO3-NaNO2-Na2SO4-Na2CO3 Solutions .. 20 4.2.6 Leaching of 241-AZ-101 Slurry  21 4.3 Aluminum and Hydroxide Concentration Data for Actual Tank Wastes  22 5.0 Conclusions and Recommendations  30 5.1 Proposed Task 2 Work Scope  30 5.2 Recommendations for Follow-On Work  31 6.0 References  33

Precipitation Risk when Diluting DFLAW Feed Saturated in Aluminum Hydroxide