US4052151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ore-processing systems including rotary kilns
Assignee: Vyzkumny Ustav Kovu
•
Filing: 1976-03-04
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Granted: 1977-10-04
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Expires: 1996-03-04
Abstract
Abstract A rotary kiln has a main cylindrical processing zone which is coupled downstream and upstream, respectively, to the charge-receiving and charge-withdrawal ports of the kiln through a pair of gas-tight spiral ducts. A reagent to be reacted with the charge is introduced coaxially into the main processing zone, and the spent reaction gases are coaxially removed therefrom. The reaction gas outlet conduit is provided with a hydraulic seal for maintaining a desired value of superatmospheric pressure in the main processing zone, and an additional gas conduit coaxial with the gas withdrawal conduit means is arranged to supply gaseous fuel to a plurality of heating tubes which are disposed in spaced relation through the walls of the main processing zone. Advantageously, the charge is preheated to the reaction temperature in a fluidization furnace or the like disposed upstream of the rotary kiln, and flue dust emitted from the preheating furnace is cleaned and routed into the main processing zone of the kiln along with the reagent. A rotary condenser disposed downstream of the kiln for subjecting the treated charge to an additional process step is provided with a protective atmosphere consisting of the spent reactive gases from the main processing zone of the rotary kiln, such reaction gases having first been cleaned by means of a filter located downstream of the hydraulic seal.
Inventors
- 👤 Vaclav Reichrt
- 👤 Josef Smalek
- 👤 Miroslav Pedlik
- 👤 Miloslav Alexa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:18
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/08; F27B7/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
266 words
In a charge processing system including a rotary kiln for heat-treating the charge in a controlled atmosphere, the kiln comprising a main cylindrical processing section in which the charge may be reacted with suitable reagents under elevated temperature and pressure, an inlet zone including a charge-receiving port disposed upstream of the main processing section, an outlet zone including a charge-withdrawal port disposed downstream of the main processing section, means for heating the interior of the main processing zone, first conduit means for introducing reagents into the main processing zone, second conduit means for withdrawing spent reaction gases from the main processing zone, and means for rotating the kiln, the improvement in which the upstream and downstream ends of the main processing section respectively comprise first and second self-contained hollow spiral ducts, the inner ends of the hollow interior of each of the first and second ducts communicating in gas-tight fashion with the interior of the main processing section, the outer ends of the hollow interior of the first and second spiral ducts individually communicating with the charge-receiving port and the charge-withdrawal port whereby charge introduced into the inlet zone enters the main processing section via the hollow interior of the first spiral duct and charge exiting from the main processing section is conducted to the outlet zone via the hollow interior of the second spiral duct, the charge passing through the hollow interior of the respective first and second spiral ducts completely filling such hollow interior to augment the gas-tight seal between the interior of the main processing section and the respective inlet and outlet zone.
Claim 2
Dependent Claim
266 words
In a charge processing system including a rotary kiln for heat-treating the charge in a controlled atmosphere, the kiln comprising a main cylindrical processing section in which the charge may be reacted with suitable reagents under elevated temperature and pressure, an inlet zone including a charge-receiving port disposed upstream of the main processing section, an outlet zone including a charge-withdrawal port disposed downstream of the main processing section, means for heating the interior of the main processing zone, first conduit means for introducing reagents into the main processing zone, second conduit means for withdrawing spent reaction gases from the main processing zone, and means for rotating the kiln, the improvement in which the upstream and downstream ends of the main processing section respectively comprise first and second self-contained hollow spiral ducts, the inner ends of the hollow interior of each of the first and second ducts communicating in gas-tight fashion with the interior of the main processing section, the outer ends of the hollow interior of the first and second spiral ducts individually communicating with the charge-receiving port and the charge-withdrawal port whereby charge introduced into the inlet zone enters the main processing section via the hollow interior of the first spiral duct and charge exiting from the main processing section is conducted to the outlet zone via the hollow interior of the second spiral duct, the charge passing through the hollow interior of the respective first and second spiral ducts completely filling such hollow interior to augment the gas-tight seal between the interior of the main processing section and the respective inlet and outlet zone.
Claim 3
Dependent Claim
28 words
A system as defined in claim 1, in which the second conduit means extends downstream from the main processing zone in coaxial relation to the second spiral duct.
Claim 4
Dependent Claim
62 words
A system as defined in claim 1, further comprising adjustable sealing means disposed in the second conduit means external to the main processing zone for maintaining a predetermined value of elevated pressure in the main processing zone while the elevated pressure is established therein and for preventing an inflow of contaminating gas to the main processing zone via the second conduit means.
Claim 5
Dependent Claim
35 words
A system as defined in claim 3, further comprising first filter means associated with the second conduit means downstream of the hydraulic sealing means for cleaning the spent reaction gases from the main processing zone.
Claim 6
Dependent Claim
67 words
A system as defined in claim 4, in which the system further comprises a rotary condenser having a charge inlet port in communication with the charge withdrawal port of the rotary kiln for introducing into the condenser a charge treated in the main processing zone, and third conduit means having an outlet end extending into the interior of the rotary condenser for supplying a reaction gas thereto.
Claim 7
Dependent Claim
32 words
A system as defined in claim 5, in which the system further comprises means for coupling the output of the first filter means to the inlet end of the third conduit means.
Claim 8
Dependent Claim
37 words
A system as defined in claim 5, in which the system further comprises sprinkler means terminating in confronting relation to the outer surface of the rotary condenser for selectively spraying the outer surface with a cooling liquid.
Claim 9
Dependent Claim
64 words
A system as defined in claim 1, in which the system further comprises a preheating furnace disposed upstream of the rotary kiln, means for coupling charge to the furnace to be preheated thereby to the reaction temperature of the main processing zone of the rotary kiln, and means for coupling the preheated charge from the furnace to the charge-receiving port of the rotary kiln.
Claim 10
Dependent Claim
69 words
A system as defined in claim 8, in which the system further comprises third conduit means for withdrawing flue dust from the furnace, filter means for cleaning the withdrawn flue dust, and fourth conduit means coupled to the filter means for conveying cleaned flue dust to the input of the first conduit means, whereby the cleaned flue dust can be introduced into the main processing zone with the reagent.
Claim 11
Dependent Claim
26 words
A system as defined in claim 1, in which the first conduit means extends upstream from the main processing zone coaxial with the first spiral duct.
Claim 12
Dependent Claim
34 words
A system as defined in claim 10 in which the system further comprises an elongated rotatable screw disposed in the first conduit means for impelling reagent and flue dust into the main processing zone.
Claim 13
Dependent Claim
22 words
A system as defined in claim 1, in which the outer ends of the respective first and second spiral ducts are funnel-shaped.
Claim 14
Dependent Claim
31 words
A system as defined in claim 1, in which the system further comprises baffle plate means for sealing the radial inner surfaces of each of the first and second spiral ducts.
Claim 15
Dependent Claim
194 words
In a charge processing system including a rotary kiln for heat-treating the charge in a controlled atmosphere, the kiln comprising a main cylindrical processing section in which the charge may be reacted with suitable reagents under elevated temperature and pressure, an inlet zone including a charge-receiving port disposed upstream of the main processing section, an outlet zone including a charge-withdrawal port disposed downstream of the main processing section, a plurality of mutually spaced gas-fired heating tubes individually projecting radially into the main processing zone, first conduit means for introducing reagents into the main processing zone, second conduit means for withdrawing spent reaction gases from the main processing section, a first spiral duct integral with the upstream end of the main processing zone and having a hollow interior through which charge may be advanced into the main processing section from the charge-receiving port when the kiln is rotated, a second spiral duct integral with the downstream end of the main processing section and having a hollow interior through which treated charge may be advanced out of the main processing section to the charge-discharge port when the kiln is rotated, and means for rotating the kiln.
Claim 16
Dependent Claim
194 words
In a charge processing system including a rotary kiln for heat-treating the charge in a controlled atmosphere, the kiln comprising a main cylindrical processing section in which the charge may be reacted with suitable reagents under elevated temperature and pressure, an inlet zone including a charge-receiving port disposed upstream of the main processing section, an outlet zone including a charge-withdrawal port disposed downstream of the main processing section, a plurality of mutually spaced gas-fired heating tubes individually projecting radially into the main processing zone, first conduit means for introducing reagents into the main processing zone, second conduit means for withdrawing spent reaction gases from the main processing section, a first spiral duct integral with the upstream end of the main processing zone and having a hollow interior through which charge may be advanced into the main processing section from the charge-receiving port when the kiln is rotated, a second spiral duct integral with the downstream end of the main processing section and having a hollow interior through which treated charge may be advanced out of the main processing section to the charge-discharge port when the kiln is rotated, and means for rotating the kiln.
Claim 17
Dependent Claim
50 words
A system as defined in claim 14, in which the second conduit means extends downstream from the main processing zone coaxial with the second spiral duct, and in which the system further comprises third conduit means extending coaxial with the second conduit means for supplying gas to the heating tubes.
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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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |