US4331551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing ruthenium contamination from radioactive effluents
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1980-04-29
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Granted: 1982-05-25
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Expires: 2000-04-29
Abstract
Abstract A method of removing ruthenium contamination from a radioactive liquid effluent, wherein: (a) the pH of said effluent is adjusted to a value of less than 5 and copper ions are added thereto, (b) the effluent thus treated is brought into contact with iron to form a copper precipitate which entrains the ruthenium, and (c) the liquid effluent is separated from the sludge formed.
Inventors
- 👤 Yves Berton
- 👤 Pierre Chauvet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:39
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A method of removing ruthenium contamination from a radioactive liquid effluent, wherein: (a) the pH of said effluent is adjusted to a value of less than 5 and copper ions are added thereto, (b) the effluent thus treated is brought into contact with iron to precipitate copper which entrains the ruthenium, and (c) liquid effluent is separated from the sludge formed.
Claim 2
Independent Claim
61 words
A method of removing ruthenium contamination from a radioactive liquid effluent, wherein: (a) the pH of said effluent is adjusted to a value of less than 5 and copper ions are added thereto, (b) the effluent thus treated is brought into contact with iron to precipitate copper which entrains the ruthenium, and (c) liquid effluent is separated from the sludge formed.
Claim 3
Dependent Claim
30 words
A methods according to claim 1, wherein, after the liquid effluent has been brought into contact with the iron, the pH is adjusted to a value of more than 8.
Claim 4
Dependent Claim
29 words
A method according to claim 1, wherein the quantity of copper ions added to said effluent is 50 to 100 mg of Cu 2+ ions per liter of effluent.
Claim 5
Dependent Claim
37 words
A method according to claim 1, wherein the effluent containing the copper ions is brought into contact with a molar quantity of iron which is greater than the molar quantity of copper ions added to said effluent.
Claim 6
Dependent Claim
29 words
A method according to claim 4, wherein the effluent is brought into contact with a quantity of iron corresponding to about 500 mg of iron per liter of effluent.
References Cited (Backward Citations)
US2792412A
Cited
US3853980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |