US4407742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for conditioning radioactive and toxic wastes
Assignee: Nukem GmbH
•
Filing: 1980-04-25
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Granted: 1983-10-04
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Expires: 2000-04-25
Abstract
Abstract Previously the conditioning of radioactive wastes took place through binding the waste in a matrix of glass, silicon carbide, cement, bitumen, synthetic resin or vitreous carbon. These processes have many disadvantages, particularly the matrix has poor heat conductivity, insufficient resistant to extraction or poor heat resistance and radiolysis effects. A remedy is provided through a carbon matrix in which there is employed as the starting material graphite which is molded with a binder at a temperature above 100° C. There have particularly proven good as the binder sulfur in admixture with nickel powder from which nickel sulfide forms.
Inventors
- 👤 Milan Hrovat
- 👤 Hans Huschka
- 👤 Lothar Rachor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:59
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/34
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
59 words
A process for conditioning radioactive and toxic wastes for the transportation and final storage through binding the waste in a carbon matrix comprising employing as the starting material for the carbon matrix natural graphite and pressing with sulfur as a binder at a temperature above 100° C. and in the melting range of sulfur to form a molded article.
Claim 2
Dependent Claim
59 words
A process for conditioning radioactive and toxic wastes for the transportation and final storage through binding the waste in a carbon matrix comprising employing as the starting material for the carbon matrix natural graphite and pressing with sulfur as a binder at a temperature above 100° C. and in the melting range of sulfur to form a molded article.
Claim 3
Dependent Claim
9 words
The product prepared by the process of claim 1.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein there is also employed a powder of a metal which forms a stable sulfide with sulfur.
Claim 5
Dependent Claim
9 words
The product prepared by the process of claim 3.
Claim 6
Dependent Claim
12 words
The process of claim 3 wherein the metal powder is nickel powder.
Claim 7
Dependent Claim
9 words
The product prepared by the process of claim 5.
Claim 8
Dependent Claim
40 words
The process of claim 5 wherein there are conditioned spherical high temperatures fuel elements having graphite in the fuel element shells and there is used as the starting material for the carbon matrix the graphite of the fuel element shells.
Claim 9
Dependent Claim
58 words
A process for conditioning radioactive and toxic wastes for the transportation and final storage through binding the waste in a carbon matrix comprising employing as the starting material for the carbon matrix graphite and pressing with sulfur as a binder at a temperature above 100° C. and in the melting range of sulfur to form a molded article.
Claim 10
Dependent Claim
58 words
A process for conditioning radioactive and toxic wastes for the transportation and final storage through binding the waste in a carbon matrix comprising employing as the starting material for the carbon matrix graphite and pressing with sulfur as a binder at a temperature above 100° C. and in the melting range of sulfur to form a molded article.
Claim 11
Dependent Claim
9 words
The product prepared by the process of claim 8.
Claim 12
Dependent Claim
22 words
The process of claim 8 wherein there is also employed a powder of a metal which forms a stable sulfide with sulfur.
Claim 13
Dependent Claim
9 words
The product prepared by the process of claim 6.
Claim 14
Dependent Claim
12 words
The process of claim 6 wherein the metal powder is nickel powder.
Claim 15
Dependent Claim
9 words
The product prepared by the process of claim 12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |