Process for reclamation of flue dust
Abstract
Abstract A METHOD FOR THE TREATMENT OF FLUE DUST FROM IRON MAKING FURNACES TO RECOVER MINOR CONSTITUENTS THEREFROM WHICH ARE VOLATILE AT HIGH TEMPERATURE AND TO REDUCE THE IRON COMPONENTS IN THE DUST TO A STATE WHERE THEY CAN BE RE-CYCLED TO THE FURNACE OR OTHERWISE USED. THE METHOD CONSISTS ESSENTIALLY IN PREHEATING THE FLUE DUST TO A TEMPERATURE APPROACHING 1700 DEGREES F. THEREAFTER, THE FLUE DUST PARTICLES ARE PASSED INTO A REDUCING, ESSENTIALLY OXYGEN-FREE, ATMOSPHERE WHERE THE TEMPERATURE IS INCREASED TO AS HIGH AS 2200 DEGREES F. A PORTION OF THIS REDUCING ATMOSPHERE IS CONTINUOUSLY DIVERTED AND COOLED TO CONDENSE THE METALLIC VOLATILES, PRIMARILY ZINC. THEREAFTER, THE REMAINING COMPONENTS OF THE DUST ARE COOLED AND RELEASED, AT A TEMPERATURE LESS THAN 700 DEGREES F., TO RECOVER THE IRON WITHOUT REOXIDATION WHEN IT IS EXPOSED TO THE ATMOSPHERE.
Inventors
- 👤 C Stevenson
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |