US4119561A
Expired / Lapsed
US
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Method for avoiding malfunctions in the solidification of aqueous, radioactive wastes in a glass, glass ceramic or glass ceramic-like matrix
Assignee: Gesellschaft fuer Kernforschung mbH
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Filing: 1977-03-17
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Granted: 1978-10-10
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Expires: 1997-03-17
Abstract
Abstract Method for preventing malfunctions in the solidification of radioactive wastes contained in an aqueous waste solution in a glass, glass ceramic or glass ceramic-like matrix wherein the wastes are spray-dried and calcinated. Diatomaceous earth or diatomaceous earth-like substances in solid form are added to the aqueous waste solution before the spray drying step in quantities of 45g/l to 70g/l and in grain sizes of which more than 85 percent by weight of the grain size distribution are grain sizes from 6 to 75μ.
Inventors
- 👤 Stefan Drobnik
- 👤 Herbert Koschorke
- 👤 Friedrich Kaufmann
- 👤 Jaroslav Saidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/002; G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/302; G21F9/305
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
Method for preventing malfunctions in the solidification of radioactive wastes contained in an aqueous waste solution in a glass, glass ceramic or glass ceramic-like matrix, wherein the waste solution is spray-dried and calcinated, comprising adding to the aqueous waste solution, before the spray drying, diatomaceous earth in solid form in quantities of from 45g/l to 70g/l and in grain sizes of which more than 85 percent by weight of the grain size distribution are grain sizes from 6 to 75μ.
Claim 2
Dependent Claim
80 words
Method for preventing malfunctions in the solidification of radioactive wastes contained in an aqueous waste solution in a glass, glass ceramic or glass ceramic-like matrix, wherein the waste solution is spray-dried and calcinated, comprising adding to the aqueous waste solution, before the spray drying, diatomaceous earth in solid form in quantities of from 45g/l to 70g/l and in grain sizes of which more than 85 percent by weight of the grain size distribution are grain sizes from 6 to 75μ.
Claim 3
Dependent Claim
23 words
Method as defined in claim 1, wherein diatomaceous earth is added to the aqueous waste solution in quantities of from 50g/l to 60g/l
Claim 4
Dependent Claim
91 words
Method as defined in claim 1, wherein diatomaceous earth is added which has a composition of about 90 percent by weight SiO 2 ; 4 percent by weight Al 2 O 3 ; 3.3 percent by weight Na 2 O + K 2 O; 1.3 percent by weight Fe 2 O 3 ; and the remainder the sum of MgO + CaO + TiO + P 2 O 5 , and a grain size distribution in which more than 70 percent by weight of the grains are between 10 and 40μ.
Claim 5
Dependent Claim
23 words
Method as defined in claim 3, wherein diatomaceous earth is added to the aqueous waste solution in quantities of from 50g/l to 60g/l.
References Cited (Backward Citations)
US3008904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |