Patent US4091545A successfully refreshed from Google Patents.
US4091545A
Expired / Lapsed
US
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Method for removing water and grease deposit from rolling mill sludge
Assignee: JFE Engineering Corp
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Filing: 1977-07-08
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Granted: 1978-05-30
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Expires: 1997-07-08
Abstract
Abstract For the purpose of utilizing as a sinter raw material a rolling mill sludge with a grease deposit having a high moisture content, which is deposited in a waste water pit of a steel rolling mill, the moisture content of said rolling mill sludge is reduced to from about 1% to 10% by drying said rolling mill sludge at a temperature of from about 120° C to about 200° C, preferably of about 140° C to about 150° C, with the use of the waste heat of a sinter cooler of a sintering machine, or by mixing said rolling mill sludge with a mill scale of a low moisture content collected without the use of roll cooling water; and then, said rolling mill sludge, the moisture content of which has thus been reduced, is continuously fed, by cutting into substantially equal batches, to at least one of a sinter discharge section, an entry section of said sinter cooler, belt-conveyor for fines return provided adjacent to a hot screen, and a return hopper of said sintering machine; whereby said grease deposit is substantially completely removed through combustion or evaporation with the use of the heat of the sinter produced by said sintering machine.
Inventors
- 👤 Tetsuo Izawa
- 👤 Shuji Kajikawa
- 👤 Koji Satomi
- 👤 Koichiro Nakano
- 👤 Shinichi Kurosawa
- 👤 Keitaro Hirai
- 👤 Yuichi Tsukada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:44
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/16; C22B1/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
A method for removing water and a grease deposit from a rolling mill sludge to convert said sludge into a sinter raw material, said sludge having a water content of at least about 20 percent by weight, which comprises the sequence of steps of: heating said rolling mill sludge with waste heat of a sinter cooler at a temperature of from about 120° to about 200° C. for a period of time sufficient to reduce the water content of said sludge to from about 1 to about 10 percent by weight, thereby reducing the viscosity thereof so as to ensure a smooth supply of said sludge; and feeding said water-reduced sludge onto hot sinter at at least one sintering operation stage consisting of (i) a sinter discharge section, (ii) an entry section of a sinter cooler, (iii) a belt conveyor for fines return provided adjacent a hot screen therein, and (iv) a return hopper of a sintering apparatus for said operation, heat of the sinter produced in said operation substantially completely removing the water and the grease deposit of said sludge.
Claim 2
Independent Claim
181 words
A method for removing water and a grease deposit from a rolling mill sludge to convert said sludge into a sinter raw material, said sludge having a water content of at least about 20 percent by weight, which comprises the sequence of steps of: heating said rolling mill sludge with waste heat of a sinter cooler at a temperature of from about 120° to about 200° C. for a period of time sufficient to reduce the water content of said sludge to from about 1 to about 10 percent by weight, thereby reducing the viscosity thereof so as to ensure a smooth supply of said sludge; and feeding said water-reduced sludge onto hot sinter at at least one sintering operation stage consisting of (i) a sinter discharge section, (ii) an entry section of a sinter cooler, (iii) a belt conveyor for fines return provided adjacent a hot screen therein, and (iv) a return hopper of a sintering apparatus for said operation, heat of the sinter produced in said operation substantially completely removing the water and the grease deposit of said sludge.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein the rolling mill sludge is a deposit in a waste water pit of a steel rolling mill.
Claim 4
Dependent Claim
24 words
The method of claim 1, wherein said rolling mill sludge is so heated at a temperature of from about 140° to about 150° C.
Claim 5
Dependent Claim
34 words
The method of claim 1, wherein said rolling mill sludge has a water content of from about 20 to about 30 percent and a grease content of from about 2 to about 3 percent.
Claim 6
Independent Claim
174 words
A method for removing water and a grease deposit from a rolling mill sludge to convert said sludge into a sinter raw material, said sludge having a water content of at least about 20 percent by weight, which comprises the sequence of steps of: mixing said rolling mill sludge and a mill scale having a water content of up to 6 percent by weight to reduce the water content of said sludge to from about 1 to about 10 percent by weight, thereby reducing the viscosity of said sludge so as to ensure a smooth supply of said sludge; and feeding said water-reduced sludge onto hot sinter at at least one sintering operation stage consisting of (i) a sinter discharge section, (ii) an entry section of a sinter cooler, (iii) a belt conveyor for fines return provided adjacent a hot screen therein, and (iv) a return hopper of a sintering apparatus for said operation, heat of the sinter produced in said operation substantially completely removing the water and the grease deposit of said sludge.
Claim 7
Independent Claim
174 words
A method for removing water and a grease deposit from a rolling mill sludge to convert said sludge into a sinter raw material, said sludge having a water content of at least about 20 percent by weight, which comprises the sequence of steps of: mixing said rolling mill sludge and a mill scale having a water content of up to 6 percent by weight to reduce the water content of said sludge to from about 1 to about 10 percent by weight, thereby reducing the viscosity of said sludge so as to ensure a smooth supply of said sludge; and feeding said water-reduced sludge onto hot sinter at at least one sintering operation stage consisting of (i) a sinter discharge section, (ii) an entry section of a sinter cooler, (iii) a belt conveyor for fines return provided adjacent a hot screen therein, and (iv) a return hopper of a sintering apparatus for said operation, heat of the sinter produced in said operation substantially completely removing the water and the grease deposit of said sludge.
Claim 8
Dependent Claim
23 words
The method of claim 5, wherein the rolling mill sludge is a deposit in a waste water pit of a steel rolling mill.
Claim 9
Dependent Claim
34 words
The method of claim 5, wherein said rolling mill sludge has a water content of from about 20 to about 30 percent and a grease content of from about 2 to about 3 percent.
References Cited (Backward Citations)
US3870632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |