US3704875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of mercury from effluent streams
Assignee: Stokes Vacuum Inc
•
Filing: 1971-07-01
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Granted: 1972-12-05
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Expires: 1991-07-01
Abstract
Abstract Apparatus for treatment of effluent streams containing very low concentrations and even trace amounts of mercury in both elemental form and as mercuric ion. The stream is passed through a closed vessel having a bed of reactive metal particles, such as Zinc, magnesium and aluminum, and iron, so that the mercury forms an amalgam on the metal surface. The bed is regenerated and the mercury recovered by heating the bed while the vessel is under vacuum and condensing the vaporized mercury. The lower temperature permitted by the reduced pressure and the absence of air precludes oxidation and clumping of the metal granules.
Inventors
- 👤 Paul Francis Waltrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:52
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/04; C22B43/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The apparatus of claim 1 wherein said reactive metal is selected from the group consisting of zinc, iron, magnesium and aluminum.
Claim 2
Dependent Claim
17 words
The apparatus of claim 2 wherein said means for supporting constitutes a foraminous plate of conical configuration.
Claim 3
Dependent Claim
22 words
The apparatus of claim 3 including a spray pipe for uniformly distributin the stream entering through the inlet port over the bed.
Claim 4
Dependent Claim
24 words
The apparatus of claim 4 wherein said means for heating comprises a coil, and means to pump a hot fluid medium through said coil.
References Cited (Backward Citations)
US3615372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |