Process for the treatment of natural apatites with a view to the

Details Process for the treatment of natural apatites with a view to the Process for the treatment of natural apatites with a view to the

1994-06-15

1997-01-28

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423308, 423311, C01B 2532, C01B 25165

Patent

active

055975429

ABSTRACT:
The invention relates to a process for the treatment of natural apatites with a view to the use thereof for storing irradiated fuel elements.
This process consists of contacting a natural apatite powder with an acid aqueous solution, e.g. dilute HNO.sub.3 or HCl for between a few seconds and 10 minutes.
In this way, the physicochemical properties of the natural apatite are improved by modifying its surface composition in order to make it close to that of hydroxyapatite. This modified apatite can be used as a filling material in irradiated fuel element storage containers.

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Chemical Abstracts, vol. 86, No. 1, 3 Jan. 1977, Columbus, Ohio, US; Abstract No. 4142w, Kato Yoshito, Fujita Takao, "Treatment of Carbonate Apatite", p. 368.
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Database Inspec. Institute of Electrical Engineers, Stevenage, GB, Inspec. No. 2072408, Hebel W. et al., "CEC Research Activities into the Immobilization of Volatile Radionuclides from Reprocessing", & Conditioning of Radioactive Wastes for Storage and Disposal. Proceedings of an International Symoposium, Utrecht, Netherlands, 21-25 Jun. 1982, pp. 245-251.
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Calcified Tissue International (1982), "Variability of Hydroxyapatite Preparations", R. A. Young and D. W. Holcomb, pp. S17-S32.
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