US2602734A
Expired / Lapsed
US
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Method of recovering suspended materials from gases from flash roasting of zinc sulfide ores
Assignee: Research Corp
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Filing: 1948-02-05
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Granted: 1952-07-08
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Expires: 1968-02-05
Abstract
No abstract record available.
Inventors
- 👤 Carl W J Hedberg
- 👤 Harry L Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:36
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/013; C; C22; C22B; C22B1/00; C22B1/02; C22B1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE METHOD OF RECOVERING SUSPENDED MATERIALS FROM THE GASES FROM THE FLASH ROASTING OF ZINC SULFIDE ORES WHICH COMPRISES INJECTING SULFURIC ACID INTO THE GASES FROM THE FLASH ROASTING OPERATION, WHICH GASES CONTAIN IN SUSPENSION ROASTED PARTICLES OF ZINC SULFIDE ORE HAVING A CHLORINE CONTENT, AND THEREAFTER SUBSTANTIALLY REMOVING SAID SUSPENDED PARTICLES AND SAID SULFURIC ACID FROM THE GASES BY SUBJECTING THE GASES TO ELECTRICAL PRECIPITATION, THE AMOUNT OF SULFURIC ACID INJECTED INTO SAID GASES BEING EFECTIVE TO PRODUCE IN THE MATERIAL RECOVERED IN SAID PRECIPITATION STEP A WAER-SOLUBLE SULFATE CONTENT OF GREATER THAN 6% CALCULATED AS SULFUR AND A SUBSTANTIALLY REDUCED CHLORINE CONTENT.
Claim 2
Independent Claim
104 words
THE METHOD OF RECOVERING SUSPENDED MATERIALS FROM THE GASES FROM THE FLASH ROASTING OF ZINC SULFIDE ORES WHICH COMPRISES INJECTING SULFURIC ACID INTO THE GASES FROM THE FLASH ROASTING OPERATION, WHICH GASES CONTAIN IN SUSPENSION ROASTED PARTICLES OF ZINC SULFIDE ORE HAVING A CHLORINE CONTENT, AND THEREAFTER SUBSTANTIALLY REMOVING SAID SUSPENDED PARTICLES AND SAID SULFURIC ACID FROM THE GASES BY SUBJECTING THE GASES TO ELECTRICAL PRECIPITATION, THE AMOUNT OF SULFURIC ACID INJECTED INTO SAID GASES BEING EFECTIVE TO PRODUCE IN THE MATERIAL RECOVERED IN SAID PRECIPITATION STEP A WAER-SOLUBLE SULFATE CONTENT OF GREATER THAN 6% CALCULATED AS SULFUR AND A SUBSTANTIALLY REDUCED CHLORINE CONTENT.
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) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |