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in subjects: "Zirconium Phosphates"  
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Oxidation resistant coatings for ceramic matrix composite components

Description: Corrosion resistant Ca{sub 0.6}Mg{sub 0.4}Zr{sub 4}(PO{sub 4}){sub 6} (CMZP) and Ca{sub 0.5}Sr{sub 0.5}Zr{sub 4}(PO{sub 4}){sub 6} (CS-50) coatings for fiber-reinforced SiC-matrix composite heat exchanger tubes have been developed. Aqueous slurries of both oxides were prepared with high solids loading. One coating process consisted of dipping the samples in a slip. A tape casting process has also been created that produced relatively thin and dense coatings covering a large area. A processing t… more
Date: November 1, 1998
Creator: Vaubert, V. M.; Stinton, D. P. & Hirschfeld, D. A.
Partner: UNT Libraries Government Documents Department
open access

Comparison of sodium zirconium phosphate-structured HLW forms and synroc for high-level nuclear waste immobilization

Description: The incorporation of (a) Cs/Sr as simulated heat-generating isotopes contained in Purex reprocessing waste, (b) simulated actinides, and (c) simulated Purex waste in sodium zirconium phosphate (NZP) has been studied. The samples were prepared by sintering, by hot pressing and by hot isostatic pressing in metal bellows containers. The short-term chemical durability of the phosphate-based material containing Purex waste was within an order of magnitude of that for Synroc-C, as measured by 7-day M… more
Date: December 31, 1996
Creator: Zyryanov, V.N. & Vance, E.R.
Partner: UNT Libraries Government Documents Department
open access

Development and testing of spheroidal inorganic sorbents

Description: The general objectives of this task are to develop, prepare, and test spheroidal inorganic ion exchangers made by the HMTA (hexamethylenetetramine) internal gelation process to remove radionuclides and heavy metals from waste streams occurring at the various DOE sites. Inorganic ion-exchange materials, such as sodium silicotitanate, sodium titanate, ammonium molybdeophosphate, phosphotungstic acid, hexacyanoferrates, titanium monohydrogen phosphate, hydrous titanium oxide, polyantimonic acid, m… more
Date: January 29, 1998
Creator: Collins, J. L. & Anderson, K. K.
Partner: UNT Libraries Government Documents Department
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Zirconium-titanium phosphate acid catalysts synthesized by sol gel techniques

Description: Recently a large effort has been put into identifying solid acid materials, particularly sulfated zirconia and other sulfated metal oxides, that can be used to replace environmentally hazardous liquid acids in industrial processes. The authors are studying a group of mixed metal phosphates, some of which have also been sulfated, for their catalytic and morphological characteristics. Zirconium and titanium are the metals used in this study and the catalysts are synthesized from alkoxide starting… more
Date: March 1, 1998
Creator: Jackson, N. B.; Thoma, S. G.; Kohler, S. & Nenoff, T. M.
Partner: UNT Libraries Government Documents Department
open access

Zirconium phosphate waste forms for low-temperature stabilization of cesium-137-containing waste streams

Description: Novel chemically bonded phosphate ceramics are being developed and fabricated for low-temperature stabilization and solidification of waste streams that are not amenable to conventional high-temperature stabilization processes because volatiles are present in the wastes. A composite of zirconium-magnesium phosphate has been developed and shown to stabilize ash waste contaminated with a radioactive surrogate of {sup 137}Cs. Excellent retainment of cesium in the phosphate matrix system was observ… more
Date: April 1, 1996
Creator: Singh, D.; Wagh, A.S. & Tlustochowicz
Partner: UNT Libraries Government Documents Department
open access

Development and testing of inorganic sorbents made by the internal gelation process for radionuclide and heavy metal separations

Description: The objectives of this task are to develop, prepare, and test microspheres and granular forms of inorganic ion exchangers to remove radionuclides and heavy metals from waste streams occurring at various sites. Several inorganic materials, such as hexacyanoferrates, titanates, phosphates, and oxides have high selectivities and efficiencies for separating and removing radionuclides such as uranium, technetium, cesium, and strontium, and metals such as cobalt, silver, zinc, and zirconium from aque… more
Date: November 29, 1995
Creator: Egan, B. Z.; Collins, J. L.; Anderson, K. K. & Chase, C. W.
Partner: UNT Libraries Government Documents Department
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