US3786619A
Expired / Lapsed
US
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Method of purifying gases containing mercury compounds and elementary mercury
Assignee: Boliden AB
•
Filing: 1972-06-01
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Granted: 1974-01-22
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Expires: 1992-06-01
Abstract
Abstract A method of purifying gases containing gaseous mercury. Mercury containing gas is passed through a mass of purifying material containing as an active constituent a material consisting of selenium, selenium sulphide or other selenium compounds or mixtures thereof.
Inventors
- 👤 K Melkersson
- 👤 B Hedenas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:21
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/64; B01D53/02; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
A method according to claim 1, wherein the active constituent is applied to an inert carrier selected from the group consisting of silicon dioxide, aluminum dioxide, iron oxide, ceramic material or mixtures thereof.
Claim 2
Dependent Claim
17 words
A method according to claim 1, wherein before being used the active constituent is formed into particles.
Claim 3
Dependent Claim
23 words
A method according to claim 1, wherein the purifying mass is activated by treating the mass with a gas containing a reducing component.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein the gases passed through the purifying mass have a temperature between 20* and 380*C.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein the gases passed through the purifying mass are roaster gases from a sulphide roasting processes.
Claim 6
Dependent Claim
28 words
A method according to claim 1, wherein the temperature and moisture content of the gas are adjusted so that liquid water is unable to condense in the mass.
Claim 7
Dependent Claim
24 words
The method according to claim 1 wherein said active constituent comprising selenium is selected from the group consisting of elemental selenium and selenium sulphide.
Claim 8
Dependent Claim
12 words
The method according to claim 4, wherein said reducing component comprises SO2.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |