IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0581227
(2000-06-23)
|
우선권정보 |
FR-0016356 (1997-12-23) |
국제출원번호 |
PCT/FR98/02826
(1998-12-22)
|
§371/§102 date |
20000623
(20000623)
|
국제공개번호 |
WO99/34370
(1999-07-08)
|
발명자
/ 주소 |
- Joelle Carpena FR
- Benoit Donazzon FR
- Jean-Louis Lacout FR
- Gerard Dechambre FR
|
출원인 / 주소 |
- Commissariat a l'Energie Atomique FR
|
대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
4 |
초록
▼
The invention involves a process for containment of industrial wastes, particularly nuclear wastes, in apatite ceramics. This process involves preparing a homogeneous mixture of powders which can form an apatite matrix, introducing the waste into this mixture, compacting it under a pressure of 100 t
The invention involves a process for containment of industrial wastes, particularly nuclear wastes, in apatite ceramics. This process involves preparing a homogeneous mixture of powders which can form an apatite matrix, introducing the waste into this mixture, compacting it under a pressure of 100 to 500 MPa at room temperature, and subjecting it to hydrothermal processing at low temperature (100 to 500.degree. C.) in the presence of water in a sealed chamber.
대표청구항
▼
1. A process for containment of industrial waste in an apatite ceramic matrix comprising the following steps:a) preparing a homogeneous mixture of powders, comprising: i) at least two calcium phosphates selected from the group consisting of Ca(H2PO4)2, Ca(H2PO4)2.H2O, Ca(HPO4), Ca(HPO4).2H2O, amorph
1. A process for containment of industrial waste in an apatite ceramic matrix comprising the following steps:a) preparing a homogeneous mixture of powders, comprising: i) at least two calcium phosphates selected from the group consisting of Ca(H2PO4)2, Ca(H2PO4)2.H2O, Ca(HPO4), Ca(HPO4).2H2O, amorphous .alpha.-Ca3(PO4)2, apatitic .alpha.-Ca3(PO4)2, amorphous .beta.-Ca3(PO4)2, apatitic .beta.-Ca3(PO4)2, and Ca4(PO4)2O; and optionally ii) at least one compound selected from the group consisting of alkaline metal salts, alkaline metal phosphates, alkaline metal silicates, alkaline metal carbonates, alkaline metal halides, alkaline metal oxides, alkaline metal hydroxides, alkaline-earth metal salts, alkaline-earth metal phosphates, alkaline-earth metal silicates, alkaline-earth metal carbonates, alkaline-earth metal halides, alkaline-earth metal oxides, alkaline-earth metal hydroxides, and oxides of silicon, wherein the mixture forms a stoichiometric hydroxyapatite of formula (II) Ca10(PO4)6(OH)2 (II) wherein calcium is partly replaced by at least one member selected from the group consisting of alkaline metals and alkaline-earth metals; phosphate anions are partly replaced by silicate anions; and hydroxide anions are partly replaced by halide anions; b) putting the industrial waste into the mixture; c) compacting the mixture of powders containing the industrial waste at room temperature, under a pressure of 100 to 500 MPa, to yield a compacted piece; and d) subjecting the compacted piece to hydrothermal treatment in a sealed chamber containing an aqueous medium, at a temperature of 100 to 500.degree. C., for a period of at least 8 hours.
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