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iii Executive Summary  iv Acknowledgments  vi Acronyms and Abbreviations  vii 1.0 Introduction and Background  1.1 2.0 Technical Approach and Scope  2.1 2.1 Quality Assurance  2.1 2.2 Gibbsite Synthesis and Characterization  2.1 2.3 Gibbsite Solubility Tests  2.2 2.4 Chemical Analysis 2.4 2.5 Solid Phase Characterization  2.5 3.0 Results and Discussion  3.1 3.1 Gibbsite Qualification  3.1 3.1.1 X-ray Diffraction (XRD)  3.1 3.1.2 Scanning Electron Microscopy and Surface Area  3.1 3.2 Gibbsite Solubility Tests  3.3 3.2.1 Attaining Steady-State Aluminum Concentration from Undersaturation  3.3 3.2.2 Attaining Steady-State Aluminum Concentration from Oversaturation at 45 °C  3.7 3.2.3 Measured Gibbsite Solubility in Current Tests versus Misra (1970) Predicted Solubility  3.10 3.2.4 Measured Gibbsite Solubility in Current Tests in Molality Units  3.12 3.2.5 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO3 Solutions  3.14 3.2.6 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO3-NaNO2 Solutions  3.18 3.2.7 Gibbsite Solubility in NaOH-NaAl(OH)4-NaNO2 Solutions  3.18 3.3 Solid Phase Characterization after Dissolution Tests  3.19 3.3.1 Effect of Dissolution from Undersaturation on Gibbsite Mineralogy and Particle Size  3.19 3.3.2 Effect of Dissolution from Undersaturation and Oversaturation on Gibbsite at 45 ± 2 °C 3.20 4.0 Summary and Conclusions  4.1 4.1 Proposed Task 3 Work Scope  4.2 4.2 Recommendations for Follow-On Work  4.3 5.0 References  5.1 Appendix A – Experimental Set-Up Pictures  A.1 Appendix B – Starting Solution Conditions for Sodium Hydroxide Containing Sodium Nitrite/Nitrate ..B.1 Appendix C – Gibbsite Solubility Tests at 80 °C C.1 Appendix D – Gibbsite Solubility Data  D.1 Appendix E – Post-Test XRD  E.1

Aluminum Hydroxide Solubility in Sodium Hydroxide Solutions Containing Nitrite/Nitrate of Relevance to Hanford Tank Waste