Patent US3475477A successfully refreshed from Google Patents.
Patent US4468253A successfully refreshed from Google Patents.
US4468253A
Expired / Lapsed
US
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Method and apparatus for continuously manufacturing non-sintered pellet
Assignee: JFE Engineering Corp
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Filing: 1983-01-17
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Granted: 1984-08-28
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Expires: 2003-01-17
Abstract
Abstract A method and an apparatus for continuously manufacturing a non-sintered pellet, which comprises: continuously supplying a green pellet having a water content of from 6 to 20 wt. % into a shaft type reactor to continuously pass the green pellet sequentially through a pre-treating zone, a hydration reaction zone and a drying zone in the shaft type reactor; blowing a pre-treating gas with a relative humidity of up to 70% and at a temperature of from 65° to 250° C. into the pre-treating zone to pre-dry the green pellet in the pre-treating zone until the difference in the water content in the green pellet before and after the abovementioned pre-drying becomes at least 4 wt. % within the limits in which the green pellet in the pre-treating zone contains at least 2 wt. % water; blowing a gas for hydration reaction at a temperature of from 50° to 100° C. containing saturated steam into the hydration reaction zone to hydrate the green pellet in the zone; and, blowing a drying gas at a temperature of from 100° to 300° C. into the drying zone to dry the green pellet in the zone, thereby hardening the green pellet in the drying zone to continuously manufacture a non-sintered pellet.
Inventors
- 👤 Osamu Tajima
- 👤 Seiji Matsui
- 👤 Hideyuki Yoshikoshi
- 👤 Tsuneo Miyashita
- 👤 Michio Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:35
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242; C22B1/243; C22B1/2413
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
300 words
A method for continuously manufacturing a non-sintered pellet, which comprises: adding a hydraulic binder and water to raw materials which comprise at least one of an iron ore fine, a non-ferrous ore fine and a dust mainly containing oxides of iron or non-ferrous metal, and mixing same; forming the resultant mixture to prepare a green pellet having a water content within the range of from 6 to 20 wt. %; continuously supplying said green pellet into a shaft type reactor which comprises a pre-treating zone, a hydration reaction zone following said pre-treating zone and a drying zone following said hydration reaction zone, to continuously pass said green pellet sequentially through said pre-treating zone, said hydration reaction zone and said drying zone; blowing a pre-treating gas at a prescribed temperature into said pre-treating zone to pre-treat said green pellet in said zone; blowing a gas for hydration reaction at a temperature within the range of from 50 to 100° C. containing saturated steam into said hydration reaction zone to hydrate said green pellet in said zone; and, blowing a drying gas at a temperature within the range of from 100° to 300° C. into said drying zone to dry said green pellet in said zone, thereby hardening said green pellet in said drying zone to continuously manufacturing a non-sintered pellet; characterized by: blowing said pre-treating gas with a relative humidity of up to 70% and at a temperature within the range of from 65° to 250° C. into said pre-treating zone to pre-dry said green pellet in said pre-treating zone until the difference in the water content in said green pellet before and after said pre-drying becomes at least 4 wt. % within the limits in which said green pellet in said pre-treating zone contains at least 2 wt. % water.
Claim 2
Independent Claim
300 words
A method for continuously manufacturing a non-sintered pellet, which comprises: adding a hydraulic binder and water to raw materials which comprise at least one of an iron ore fine, a non-ferrous ore fine and a dust mainly containing oxides of iron or non-ferrous metal, and mixing same; forming the resultant mixture to prepare a green pellet having a water content within the range of from 6 to 20 wt. %; continuously supplying said green pellet into a shaft type reactor which comprises a pre-treating zone, a hydration reaction zone following said pre-treating zone and a drying zone following said hydration reaction zone, to continuously pass said green pellet sequentially through said pre-treating zone, said hydration reaction zone and said drying zone; blowing a pre-treating gas at a prescribed temperature into said pre-treating zone to pre-treat said green pellet in said zone; blowing a gas for hydration reaction at a temperature within the range of from 50 to 100° C. containing saturated steam into said hydration reaction zone to hydrate said green pellet in said zone; and, blowing a drying gas at a temperature within the range of from 100° to 300° C. into said drying zone to dry said green pellet in said zone, thereby hardening said green pellet in said drying zone to continuously manufacturing a non-sintered pellet; characterized by: blowing said pre-treating gas with a relative humidity of up to 70% and at a temperature within the range of from 65° to 250° C. into said pre-treating zone to pre-dry said green pellet in said pre-treating zone until the difference in the water content in said green pellet before and after said pre-drying becomes at least 4 wt. % within the limits in which said green pellet in said pre-treating zone contains at least 2 wt. % water.
Claim 3
Dependent Claim
30 words
The method as claimed in claim 1, wherein: a gas containing at least 3 vol. % carbon dioxide gas is used as said drying gas blown into said drying zone.
Claim 4
Dependent Claim
28 words
The method as claimed in claim 1 wherein said raw materials comprise at least one of an iron ore fine and a dust mainly containing oxides of iron.
Claim 5
Dependent Claim
28 words
The method as claimed in claim 2 wherein said raw materials comprise at least one of an iron ore fine and a dust mainly containing oxides of iron.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |