Patent US3841862A successfully refreshed from Google Patents.
US3841862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling, condensation and purification of vapours and gases
Assignee: METALLURICAL PROCESSES Ltd
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Filing: 1972-11-29
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Granted: 1974-10-15
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Expires: 1992-11-29
Abstract
Abstract Method of condensing a vapour, particularly zinc vapour originating from a zinc smelting blast furnace, by passing the vapour through a spray of molten metal droplets, usually molten lead, the spray being produced by the mutual impingement of at least two continuous streams of the molten metal which emerge from the roof of a chamber through which the vapour to be treated is passed. Conveniently, the impinging streams of molten metal emerge from the roof of a cross-over duct connecting the upper part of the shaft of a zinc smelting blast furnace with a conventional lead-splash condenser.
Inventors
- 👤 F Benatt
- 👤 M Gammon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:45
CPC Classifications
C; C22; C22B; C22B17/00; C22B19/00; C22B19/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
A METHOD CONDENSING A VAPOUR SELECTED FROM THE GROUP CONSISTING OF ZINC VAPOR AND CADMIUM VAPOUR, COMPRISING: PRODUCING A SPRAY OF MOLTEN LEAD DROPLETS BY CAUSING AT LEAST TWO CONTINOUS STREAM OF MOLTEN LEAD TO MUTUALLY IMPINGE ON EACH OTHER, AND PASSING THE VAPOUR THROUGH THE LEAD SPRAY THUS PRODUCED.
Claim 2
Independent Claim
50 words
A METHOD CONDENSING A VAPOUR SELECTED FROM THE GROUP CONSISTING OF ZINC VAPOR AND CADMIUM VAPOUR, COMPRISING: PRODUCING A SPRAY OF MOLTEN LEAD DROPLETS BY CAUSING AT LEAST TWO CONTINOUS STREAM OF MOLTEN LEAD TO MUTUALLY IMPINGE ON EACH OTHER, AND PASSING THE VAPOUR THROUGH THE LEAD SPRAY THUS PRODUCED.
Claim 3
Dependent Claim
38 words
A method as claimed in claim 1, wherein the molten lead spray comprises a plurality of successive spray curtains each produced by at least one spray unit consisting of at least two mutually impinging streams of molten lead.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1, wherein the vapour to be treated originates from a zinc smelting blast furnace and is mixed with oxides of carbon and with nitrogen.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 1, wherein the molten metal comprising the spray is molten lead at a temperature of between 430* and 650*C.
Claim 6
Dependent Claim
36 words
A method as claimed in claim 1, comprising causing the impinging streams of molten lead to emerge from converging jets in the roof of a chamber, and passing the vapour to be treated through the chamber.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the jets are angled at approximately 30* to the horizontal.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |