US3630353A - Method for separation of fines from hot broken sinter - Google Patents
Method for separation of fines from hot broken sinter Download PDFInfo
- Publication number
- US3630353A US3630353A US810628A US3630353DA US3630353A US 3630353 A US3630353 A US 3630353A US 810628 A US810628 A US 810628A US 3630353D A US3630353D A US 3630353DA US 3630353 A US3630353 A US 3630353A
- Authority
- US
- United States
- Prior art keywords
- sinter
- fines
- air
- precipitator
- blast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
Definitions
- the invention is directed to the removal of granular fines or dust from broken sinter cake, before delivery thereof to a blast furnace, by subjecting the broken cake, during passage from the sinter breakers to the cooling area, to a pressurized upward blast of air which carries the sinter fines through an exhaust hood and suitable conveyor conduit into a precipitator which removes the fines for return to the sinter machine and discharges the air to the atmosphere.
- the invention is concerned with the sintering of metallic ore fines for processing in a conventional blast furnace in the manufacture of steel.
- the invention is concerned with the processing of iron ore fines for reduction in a blast furnace by agglomerating the ore fines by the known process of sintering the ore fines and fuel to form sinter cakes.
- the sinter cakes are discharged from the sintering line and broken into smaller sizes by known methods. During the breaking of the sinter cakes many fines are produced and are mixed with the larger size pieces of sinter. The charge such a mixture into a blast furnace would result in air pollution due to the blast air blowing said fines into the atmosphere, with consequent loss of valuable ore.
- One object of the invention is to provide a suitable pressurized blast of cooling air through the broken sinter cake as it moves off the sinter feed line and through a conventional rotating sinter cooler, by collecting such blast air above said cooler and passing it through a suitable precipitator which returns the sinter fines to the sintering machine for reuse and discharges the excess air to the atmosphere.
- Another object of the invention is to provide means for enclosing a portion of a rotating sinter cooling means with a suitable exhaust hood connected with a suitable precipitator and passing a blast of air under pressure through the cooling broken sinter moving beneath said hood to remove the fines therefrom and discharge such fines into a suitable precipitator.
- the collected fines are discharged from the bottom of the precipitator and the excess dust free air within the precipitator is withdrawn from adjacent the top of the precipitator by a suitable exhaust fan for discharge to the atmosphere.
- a further object of the invention is to form the sinter cooling means as a rotating annular member which receives the crushed sinter cake from the sinter feed line and passing same through vertical pressurized air blast to remove the fines therefrom and discharge them into the precipitator.
- FIG. I shows a side elevation of the apparatus of the invention
- FIG. 2 shows a plan view of the apparatus.
- a generally circular U-shaped rotating cooler 1 having a perforated bottom wall.
- Beneath cooler perforated bottom wall in close spaced relation thereto, for a length of about one-fifth of the periphery thereof, there is mounted a suitable wind box or pressure chamber 3 having connected thereto an air pressure pump 4.
- the air stream from pump 4 and pressure chamber 3 flows vertically upward through the perforated bottom wall of the rotating cooler l and the broken sinter thereon.
- the fine granular portions of the sinter cake layer are carried upwardly by the air stream into an overlying exhaust hood 5 and through conduit 6 connected therewith, into a suitable precipitator 8.
- An exhaust fan 7 withdraws air from the top portion of the precipitator 8 through a conduit 9 and the precipitated sinter fines are withdrawn from precipitator 8 through the bottom thereof for return to the sintering mechanism (not shown), for reuse in forming sinter cakes.
- the pressure at which air from pump 4 is supplied to wind box 3 may be varied in accordance with the depth of the layer of sinter upon the sinter cooler 1.
- Such air pressure may vary between 4 to 32 inches water column pressure, preferably l6 to 24 inches water column pressure will sufiice to remove substantially all of the granular fines of 0 to 14 mesh from the sinter.
- the following table illustrates the comparative pressures of the air stream at the pressure pump and at the sinter layer for varying depth of sinter upon the rotating cooler.
- a method for dry classification of crushed hot sinter as received from a conventional sintering machine comprising the steps of:
Abstract
The invention is directed to the removal of granular fines or dust from broken sinter cake, before delivery thereof to a blast furnace, by subjecting the broken cake, during passage from the sinter breakers to the cooling area, to a pressurized upward blast of air which carries the sinter fines through an exhaust hood and suitable conveyor conduit into a precipitator which removes the fines for return to the sinter machine and discharges the air to the atmosphere.
Description
United States Patent Inventors Horst Seidel Biscofsheim; Fred Cappel, Neu-lsenburg 11, both of Germany Appl. No. 810,628 Filed Mar. 26, 1969 Patented Dec. 28, 1971 Assignee Dravo Corporation Pittsburgh, Pa. Priority Mar. 30, 1968 Germany P 17 58 081.3
METHOD FOR SEPARATION OF FINES FROM HOT BROKEN SINTER 3 Claims, 2 Drawing Figs.
U.S. Cl 209/11, 34/57, 34/187, 75/5, 209/139, 209/466, 266/21 Int. Cl B07b 4/08 Field of Search 209/1 1, 19,
References Cited UNITED STATES PATENTS 2,874,484 2/1959 Dapses 34/187 3,161,485 12/1964 Buhrer 34/85 X 3,309,787 3/1967 Forsyth et al. 34/187 X 3,313,534 4/1967 Frans 266/21 X 3,374,998 3/1968 266/21 3,381,948 5/1968 Stirling 266/21 Primary Examiner-Frank W. Lutter Assistant Examiner-William Cuchlinski, Jr. Attorney-Parmelee, Utzler and Welsh ABSTRACT: The invention is directed to the removal of granular fines or dust from broken sinter cake, before delivery thereof to a blast furnace, by subjecting the broken cake, during passage from the sinter breakers to the cooling area, to a pressurized upward blast of air which carries the sinter fines through an exhaust hood and suitable conveyor conduit into a precipitator which removes the fines for return to the sinter machine and discharges the air to the atmosphere.
mamas ntnze l97l SHEET 1 BF 2 INVENTORS. HORST SE/DELand FRED CAPPEL GMQW rid/4A1,
A r forneys PATENTED UEC28I97I I 1630.353
BRIEF SUMMARY OF THE INVENTION The invention is concerned with the processing of iron ore fines for reduction in a blast furnace by agglomerating the ore fines by the known process of sintering the ore fines and fuel to form sinter cakes. The sinter cakes are discharged from the sintering line and broken into smaller sizes by known methods. During the breaking of the sinter cakes many fines are produced and are mixed with the larger size pieces of sinter. The charge such a mixture into a blast furnace would result in air pollution due to the blast air blowing said fines into the atmosphere, with consequent loss of valuable ore.
One object of the invention is to provide a suitable pressurized blast of cooling air through the broken sinter cake as it moves off the sinter feed line and through a conventional rotating sinter cooler, by collecting such blast air above said cooler and passing it through a suitable precipitator which returns the sinter fines to the sintering machine for reuse and discharges the excess air to the atmosphere.
Another object of the invention is to provide means for enclosing a portion of a rotating sinter cooling means with a suitable exhaust hood connected with a suitable precipitator and passing a blast of air under pressure through the cooling broken sinter moving beneath said hood to remove the fines therefrom and discharge such fines into a suitable precipitator. The collected fines are discharged from the bottom of the precipitator and the excess dust free air within the precipitator is withdrawn from adjacent the top of the precipitator by a suitable exhaust fan for discharge to the atmosphere.
A further object of the invention is to form the sinter cooling means as a rotating annular member which receives the crushed sinter cake from the sinter feed line and passing same through vertical pressurized air blast to remove the fines therefrom and discharge them into the precipitator.
DESCRIPTION OF THE DRAWINGS FIG. I shows a side elevation of the apparatus of the invention, and
FIG. 2 shows a plan view of the apparatus.
DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION As is well known in the art of making sinter, the sintered ore or other product is discharged from the pallet in which it is formed as a coherent mass referred to as sinter cakes." These sinter cakes are discharged upon a gratelike support known as grizzly bars where the cake" is engaged by a suitable tool and broken into smaller pieces, and are passed onto a sinter feeder 2. During this breaking operation, considerable amounts of still smaller pieces known as fines are formed, which are also passed onto the sinter feeder.
In the present invention we pass the broken sinter cake and fines from sinter feeder 2 on to a generally circular U-shaped rotating cooler 1 having a perforated bottom wall. Beneath cooler perforated bottom wall, in close spaced relation thereto, for a length of about one-fifth of the periphery thereof, there is mounted a suitable wind box or pressure chamber 3 having connected thereto an air pressure pump 4. The air stream from pump 4 and pressure chamber 3 flows vertically upward through the perforated bottom wall of the rotating cooler l and the broken sinter thereon. The fine granular portions of the sinter cake layer are carried upwardly by the air stream into an overlying exhaust hood 5 and through conduit 6 connected therewith, into a suitable precipitator 8.
An exhaust fan 7 withdraws air from the top portion of the precipitator 8 through a conduit 9 and the precipitated sinter fines are withdrawn from precipitator 8 through the bottom thereof for return to the sintering mechanism (not shown), for reuse in forming sinter cakes.
The pressure at which air from pump 4 is supplied to wind box 3 may be varied in accordance with the depth of the layer of sinter upon the sinter cooler 1. Such air pressure may vary between 4 to 32 inches water column pressure, preferably l6 to 24 inches water column pressure will sufiice to remove substantially all of the granular fines of 0 to 14 mesh from the sinter.
The following table illustrates the comparative pressures of the air stream at the pressure pump and at the sinter layer for varying depth of sinter upon the rotating cooler.
The arrangement as described provides many advantages over prior practices. Thus, hot screening of the sinter for removal of fines is eliminated and a smaller granular size of return material is obtained. This results in a reduction of the recycled return material with substantial increase in capacity of the sintering strands, and reduction of coke used on the sintering strands. Additionally, there is an increase in the production output of the blast furnace receiving such sinter, due to reduction of sinter fines lost through the furnace air blast in melting. The amount of atmospheric dust is also reduced due to use of the precipitator 8 adjacent the sinter cooler. A further advantage is that such a system can be installed in many existing sintering systems, with a minimum of alterations.
We claim:
1. A method for dry classification of crushed hot sinter as received from a conventional sintering machine, comprising the steps of:
feeding the crushed sinter cake in the absence of prior screening onto a conventional rotating cooling device having a perforated sinter carrying surface,
blowing a blast of pressurized air upwardly through the bottom of the perforated surface of said cooling device for displacement of sinter fines thereon while retaining the remaining of said crushed sinter on said surface,
' collecting the air blast and suspended fines therein from above the top surface of said perforated surface of said cooling device and discharging same into a suitable precipitator to separate the fines from said air blast,
continuously withdrawing the air from the upper portion of the precipitator, and
collecting the separated fines from the bottom of said precipitator and returning them to the moving sintering machine for incorporation into the sintering cake forming thereon.
2. The method as defined in claim I, wherein said air blast is under a pressure of 4 to 32 inches W.C. of pressure, preferably 20 to 24 inches W.C.
3. The process as defined in claim 1 wherein said sinter fines displaced from the sinter layer of said air blast are less than one-eighth inch, preferably less than one thirty-second inch in size.
Claims (3)
1. A method for dry classification of crushed hot sinter as received from a conventional sintering machine, comprising the steps of: feeding the crushed sinter cake in the absence of prior screening onto a conventional rotating cooling device having a perforated sinter carrying surface, blowing a blast of pressurized air upwardly through the bottom of the perforated surface of said cooling device for displacement of sinter fines thereon while retaining the remaining of said crushed sinter on said surface, collecting the air blast and suspended fines therein from above the top surface of said perforated surface of said cooling device and discharging same into a suitable precipitator to separate the fines from said air blast, continuously withdrawing the air from the upper portion of the precipitator, and collectiNg the separated fines from the bottom of said precipitator and returning them to the moving sintering machine for incorporation into the sintering cake forming thereon.
2. The method as defined in claim 1, wherein said air blast is under a pressure of 4 to 32 inches W.C. of pressure, preferably 20 to 24 inches W.C.
3. The process as defined in claim 1 wherein said sinter fines displaced from the sinter layer by said air blast are less than one-eighth inch, preferably less than one thirty-second inch in size.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681758081 DE1758081C3 (en) | 1968-03-30 | Classification of sinter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3630353A true US3630353A (en) | 1971-12-28 |
Family
ID=5694846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US810628A Expired - Lifetime US3630353A (en) | 1968-03-30 | 1969-03-26 | Method for separation of fines from hot broken sinter |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3630353A (en) |
| AT (1) | AT285483B (en) |
| BE (1) | BE730728A (en) |
| FR (1) | FR2005151A1 (en) |
| GB (1) | GB1207106A (en) |
| LU (1) | LU58285A1 (en) |
| NL (1) | NL6904786A (en) |
| SE (1) | SE348825B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3831747A (en) * | 1972-06-02 | 1974-08-27 | Huber Corp J M | Fluidized bed processing of carbon black |
| US3909189A (en) * | 1971-08-25 | 1975-09-30 | Mcdowell Wellman Eng Co | Process for conditioning sinter draft for electrostatic precipitation of particulate material therefrom |
| US4310417A (en) * | 1979-07-31 | 1982-01-12 | Reclamet, Inc. | Air inlet material separator for chip centrifuge |
| US4944247A (en) * | 1986-03-07 | 1990-07-31 | Aluminum Company Of America | Animal litter |
| US5106487A (en) * | 1989-07-26 | 1992-04-21 | Inter-Source Recovery Systems, Inc. | Parts separator device for separating heavy materials from chips and lubricants |
| US6352573B2 (en) | 2000-03-21 | 2002-03-05 | Midrex International B.V. Rotterdam | Method for the separation and recycling of hot fines in hot briquetting of reduced iron |
| US20030099752A1 (en) * | 2001-10-19 | 2003-05-29 | The Procter & Gamble Co. | Liquid coffee concentrates |
| US9968944B2 (en) | 2013-03-15 | 2018-05-15 | Inter-Source Recovery Systems | Parts separator |
| US10195470B2 (en) | 2013-03-15 | 2019-02-05 | Oy Halton Group Ltd. | Water spray fume cleansing with demand-based operation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19501830A1 (en) * | 1995-01-21 | 1996-07-25 | Abb Management Ag | Method for preparing slag from rubbish incinerators |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2874484A (en) * | 1956-11-09 | 1959-02-24 | Wolverine Equipment Co | Apparatus for thermally treating articles |
| US3161485A (en) * | 1957-12-20 | 1964-12-15 | Fischer Ag Georg | Sand cooling plant |
| US3309787A (en) * | 1963-04-03 | 1967-03-21 | Vickers Armstrongs Ltd | Grate coolers |
| US3313534A (en) * | 1965-07-21 | 1967-04-11 | Allis Chalmers Mfg Co | Method and furnace for heat treating minerals |
| US3374998A (en) * | 1963-06-26 | 1968-03-26 | Stirling Sintering Company | Sinter breaker and roll crusher |
| US3381948A (en) * | 1965-02-11 | 1968-05-07 | Stirling Sintering Company | Apparatus for the reclamation of fine material |
-
1969
- 1969-02-17 AT AT158669A patent/AT285483B/en active
- 1969-02-21 GB GB9577/69A patent/GB1207106A/en not_active Expired
- 1969-03-04 SE SE02991/69A patent/SE348825B/xx unknown
- 1969-03-24 LU LU58285D patent/LU58285A1/xx unknown
- 1969-03-24 FR FR6908548A patent/FR2005151A1/fr not_active Withdrawn
- 1969-03-26 US US810628A patent/US3630353A/en not_active Expired - Lifetime
- 1969-03-27 NL NL6904786A patent/NL6904786A/xx unknown
- 1969-03-28 BE BE730728D patent/BE730728A/xx unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2874484A (en) * | 1956-11-09 | 1959-02-24 | Wolverine Equipment Co | Apparatus for thermally treating articles |
| US3161485A (en) * | 1957-12-20 | 1964-12-15 | Fischer Ag Georg | Sand cooling plant |
| US3309787A (en) * | 1963-04-03 | 1967-03-21 | Vickers Armstrongs Ltd | Grate coolers |
| US3374998A (en) * | 1963-06-26 | 1968-03-26 | Stirling Sintering Company | Sinter breaker and roll crusher |
| US3381948A (en) * | 1965-02-11 | 1968-05-07 | Stirling Sintering Company | Apparatus for the reclamation of fine material |
| US3313534A (en) * | 1965-07-21 | 1967-04-11 | Allis Chalmers Mfg Co | Method and furnace for heat treating minerals |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3909189A (en) * | 1971-08-25 | 1975-09-30 | Mcdowell Wellman Eng Co | Process for conditioning sinter draft for electrostatic precipitation of particulate material therefrom |
| US3831747A (en) * | 1972-06-02 | 1974-08-27 | Huber Corp J M | Fluidized bed processing of carbon black |
| US4310417A (en) * | 1979-07-31 | 1982-01-12 | Reclamet, Inc. | Air inlet material separator for chip centrifuge |
| US4944247A (en) * | 1986-03-07 | 1990-07-31 | Aluminum Company Of America | Animal litter |
| US5106487A (en) * | 1989-07-26 | 1992-04-21 | Inter-Source Recovery Systems, Inc. | Parts separator device for separating heavy materials from chips and lubricants |
| US6352573B2 (en) | 2000-03-21 | 2002-03-05 | Midrex International B.V. Rotterdam | Method for the separation and recycling of hot fines in hot briquetting of reduced iron |
| US20030099752A1 (en) * | 2001-10-19 | 2003-05-29 | The Procter & Gamble Co. | Liquid coffee concentrates |
| US9968944B2 (en) | 2013-03-15 | 2018-05-15 | Inter-Source Recovery Systems | Parts separator |
| US10195470B2 (en) | 2013-03-15 | 2019-02-05 | Oy Halton Group Ltd. | Water spray fume cleansing with demand-based operation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1207106A (en) | 1970-09-30 |
| FR2005151A1 (en) | 1969-12-05 |
| BE730728A (en) | 1969-09-01 |
| SE348825B (en) | 1972-09-11 |
| AT285483B (en) | 1970-10-27 |
| LU58285A1 (en) | 1969-07-15 |
| NL6904786A (en) | 1969-10-02 |
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