title: Characterization of high phosphate radioactive tank waste and simulant development.
abstract: A sample of high-level radioactive tank waste was characterized to provide a basis for developing a waste simulant. The simulant is required for pilot-scale testing of pretreatment processes in a nonradiological facility. The waste material examined was derived from the bismuth phosphate process, which was the first industrial process implemented to separate plutonium from irradiated nuclear fuel. The bismuth phosphate process sludge is a complex mixture rich in bismuth, iron, sodium, phosphorus,silicon, and uranium.The form of phosphorus in this particular tank waste material is of specific importance because that is the primary component (other than water-soluble sodium salts) that must be removed from the high-level waste solids by pretreatment. This work shows unequivocally that the phosphorus in this waste material is not present as bismuth phosphate. Rather, the phosphorus appears to be incorporated mostly into an amorphous iron(III) phosphate phase. The bismuth in the sludge solids is best described as BiFeO3. The behavior of phosphorus during caustic leaching of the bismuth phosphate process sludge solids is also discussed.
authors.affiliation: Pacific Northwest National Laboratory, MSIN P7-25, Richland, Washington 99352, USA. gregg.lumetta@pnl.gov
authors.forename: Gregg J
authors.initials: GJ
authors.lastname: Lumetta
authors.forename: Bruce K
authors.initials: BK
authors.lastname: McNamara
authors.forename: Edgar C
authors.initials: EC
authors.lastname: Buck
authors.forename: Sandra K
authors.initials: SK
authors.lastname: Fiskum
authors.forename: Lanée A
authors.initials: LA
authors.lastname: Snow
mesh_terms: D001729:Bismuth / Q000032:analysis; D004055:Differential Thermal Analysis; D052918:Environmental Restoration and Remediation; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010758:Phosphorus / Q000032:analysis; D011850:Radioactive Waste / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D011850:Radioactive Waste; D010758:Phosphorus; D001729:Bismuth; C035883:bismuth phosphate