Hazardous or toxic waste destruction or containment – Destruction or containment of radioactive waste – By fixation in stable solid media
Patent
1994-09-14
1997-10-14
Mai, Ngoclan
Hazardous or toxic waste destruction or containment
Destruction or containment of radioactive waste
By fixation in stable solid media
588 13, 588256, G21F 900
Patent
active
056782330
ABSTRACT:
The present invention discloses a method of creating a monolithic wasteform consisting of a binder which chemically immobilizes heavy metals and radioactive materials so as to render them environmentally safe. An apatite or apatite-like material may be employed in immobilizing the hazardous material. A preferred practice of the invention employs a hydroxyapatite or a calcium depleted hydroxyapatite into which the waste materials are substituted and immobilized. The stoichiometric apatite or calcium deficient hydroxyapatite may be formed in the aqueous solution containing heavy metals or radioactive materials, or both, wherein binding of the latter is effected. Alternatively, a preformed calcium deficient phosphate may be introduced into the solution having heavy metals or radioactive materials, or both, dissolved therein in effecting the desired binding in situ. A high strength monolithic wasteform which may be stored or buried for long-term, safe storage of the hazardous materials is produced.
REFERENCES:
patent: 3032497 (1962-05-01), Rhodes et al.
patent: 4172807 (1979-10-01), Larker
patent: 4442028 (1984-04-01), Wolf et al.
patent: 4537710 (1985-08-01), Komarneni et al.
patent: 4612053 (1986-09-01), Brown et al.
patent: 4671882 (1987-06-01), Douglas et al.
patent: 4707273 (1987-11-01), Halterman et al.
patent: 4737356 (1988-04-01), O'Hara et al.
patent: 4847008 (1989-07-01), Boatner et al.
patent: 4880610 (1989-11-01), Constantz
patent: 4902427 (1990-02-01), Szczepanik
patent: 4917802 (1990-04-01), Fukaya et al.
patent: 5047031 (1991-09-01), Constantz
patent: 5053212 (1991-10-01), Constantz et al.
patent: 5129905 (1992-07-01), Constantz
patent: 5178845 (1993-01-01), Constantz et al.
patent: 5495064 (1996-02-01), James et al.
patent: 5512702 (1996-04-01), Ryan et al.
J. C. Cunnane et al., High-Level Nuclear-Waste Borosilicate Glass: A Compendium of Characteristics, pp. 225-232, 1993, Mat. Res. Soc. Symp. Proc., vol. 294.
R. R. Seitz et al., Near-Field Performance Assessment for the Saltstone Disposal Facility, pp. 731-736, Mat. Res. Soc. Symp. Proc., vol. 294.
H. T. Weger et al., Bulk Solubility and Speciation of Plutonium (VI) in Phosphate-Containing Solutions, pp. 739-745, 1993, Mat. Res. Soc. Symp. Proc., vol. 294.
R. Gauglitz et al., Immobilization of Actinides by Hydroxylapatite, pp. 567-573, 1992, Mat. res. Soc. Symp. Proc., vol. 257.
R. Atabek et al., Nuclear Waste Immobilization in Cement-Based Materials: Overview of French Studies, pp. 3-14, 1990, Mat. Res. Soc. Symp. Proc., vol. 176.
Solid Waste Leaching Procedure Manual (SW-924), pp. i-viii and 1-52, Mar. 1984, U.S. Environmental Protection Agency.
D. M. Roy et al., Crystal Chemistry, Crystal Growth, and Phase Equilibria of Apatites, pp. 185-239, 1978, Crystal Chemistry, Academia Press.
Mai Ngoclan
Silverman Arnold B.
LandOfFree
Method of immobilizing toxic or radioactive inorganic wastes and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of immobilizing toxic or radioactive inorganic wastes and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of immobilizing toxic or radioactive inorganic wastes and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1563380