Removal of radioactive and other hazardous material from...

Catalyst – solid sorbent – or support therefor: product or process – Solid sorbent – Organic

Reexamination Certificate

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C502S407000, C502S439000

Reexamination Certificate

active

07115542

ABSTRACT:
Hollow glass microspheres obtained from fly ash (cenospheres) are impregnated with extractants/ion-exchangers and used to remove hazardous material from fluid waste. In a preferred embodiment the microsphere material is loaded with ammonium molybdophosphonate (AMP) and used to remove radioactive ions, such as cesium-137, from acidic liquid wastes. In another preferred embodiment, the microsphere material is loaded with octyl(phenyl)-N-N-diisobutyl-carbamoylmethylphosphine oxide (CMPO) and used to remove americium and plutonium from acidic liquid wastes.

REFERENCES:
patent: 4788164 (1988-11-01), Che et al.
patent: 6710013 (2004-03-01), Kato et al.
Suss. M. et al., “Investigation of the Sorption of Cesium from Acid Solutions by Various Sorbents”, Radiochimica Acta. 29, pp. 33-40 (1981).
Smit. J. Van R., “Insoluble Heteropolyacid Salts”, Inorganic Ion Exchangers in Chemical Analysis, pp. 68-69, CRC Press. Boston. 1991.
Aloy, A. S. et al., “Development and Testing of a New Porous Crystalline Matrix (Gubka) for Stabilizing Actinide Solutions”, Scientific Basis for Nuclear Waste Management XXIII, Mat. Res. Soc. Symp. Proc., vol. 608. pp. 637-642. Oct. 9 (2000).
Knecht, D. A. et al., “Progress in Development of Porous Crystalline Matrix (Gubka) for Stabilizing Liquid Waste Solutions”, Proceedings of Waste Management 2001. , Tuscon, AZ. Mar. (2001).
Anshits, A.G. et al., “Development and Characteristics of a New Porous Glass Crystalline Matrix (Gubka) for Stabilizing Radioactive and Hazardous Solutions”, Scientific Basis for Nuclear Waste Management XXIV, Mat. Res. Soc. Symp. Proc. , vol. 663, Dec. 21 (2001).
Tranter, T. J. et al., “Evaluation of Ammonium Molybdophosphate-Polyacrylonitrile (AMP-PAN) as a Cesium Selective Sorbent for the Removal of Cs-137 from Acidic Nuclear Waste Solutions”, Advances in Environmental Research, vol. 6, Issue 2, pp. 107-121, Mar. (2002).

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