CA1192142A - Method for thickening of pulp slurry or suspension and disk filter for carrying out the method - Google Patents
Method for thickening of pulp slurry or suspension and disk filter for carrying out the methodInfo
- Publication number
- CA1192142A CA1192142A CA000398677A CA398677A CA1192142A CA 1192142 A CA1192142 A CA 1192142A CA 000398677 A CA000398677 A CA 000398677A CA 398677 A CA398677 A CA 398677A CA 1192142 A CA1192142 A CA 1192142A
- Authority
- CA
- Canada
- Prior art keywords
- filter
- disk
- disks
- sector
- shaft
- 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
Links
- 239000013055 pulp slurry Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000725 suspension Substances 0.000 title claims abstract description 11
- 230000008719 thickening Effects 0.000 title claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 239000011796 hollow space material Substances 0.000 claims abstract description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 229910001868 water Inorganic materials 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- HCTVWSOKIJULET-LQDWTQKMSA-M phenoxymethylpenicillin potassium Chemical compound [K+].N([C@H]1[C@H]2SC([C@@H](N2C1=O)C([O-])=O)(C)C)C(=O)COC1=CC=CC=C1 HCTVWSOKIJULET-LQDWTQKMSA-M 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
ABSTRACT:
Method and equipment for thickening of pulp slurry or suspension by means of a rotary disk filter partly submerged in the pulp slurry or suspension con-tained in a basin. A positive pressure prevails outside the filter faces of the disks. Besides for filtering, pressurized air is also utilized for detaching the fil-tered pulp from the filter faces of the disks by passing pressurized air into the sector of each filter that is at the detaching stage. From this sector the air is discharged through the filter face to outside the filter face. The disk filter comprises a basin, a hood placed above the basing and filter disks mounted on a shaft, consisting Or sectors, and revolving in the basin.
So as to produce positive pressure outside the filter faces of the disks, a longitudinal hollow space inside the shaft is connected with a source of positive pressure and with the disk sector placed at the detaching position of each disk.
Method and equipment for thickening of pulp slurry or suspension by means of a rotary disk filter partly submerged in the pulp slurry or suspension con-tained in a basin. A positive pressure prevails outside the filter faces of the disks. Besides for filtering, pressurized air is also utilized for detaching the fil-tered pulp from the filter faces of the disks by passing pressurized air into the sector of each filter that is at the detaching stage. From this sector the air is discharged through the filter face to outside the filter face. The disk filter comprises a basin, a hood placed above the basing and filter disks mounted on a shaft, consisting Or sectors, and revolving in the basin.
So as to produce positive pressure outside the filter faces of the disks, a longitudinal hollow space inside the shaft is connected with a source of positive pressure and with the disk sector placed at the detaching position of each disk.
Description
Method for thickening of pulp slurry or suspen~ion and disk filter ~or carrying out the method The present invention is concerned with a method for thickening of pulp slurry or suspension by means of a rotary disk filter partly submerged in the pulp slurry or suspension contained in a basin, a positive pressure prevailing outside the filter ~aces of the disks. The invention is also concerned with a disk filter for carrying out the method, which filter comprises a basin, a hood placed above the basin, and filter disks mounted on a sha~t, consisting of sectors~ and revolving in the basin.
Pulps are thickened by means of various filters, e.g. drum or disk filters. An advantage o~ a disk filter as compared with a drum filter is that its filtering area is large in relation to the overall volume of space re-quired by the filter. When a disk filter is used~ an approximately 2- to 3-~old filtering area can be accommo-dated within the same floor area as compared with a drum filter. The construction and operation o~ disk filters are described, e.g.g in the Finnish Patents 54,o60 and 56,628.
In prior-art disk filters, the filtering pro-cess is produced by using suction inside the filter disks.
In that case, there is normal atmospheric pressure outside the disks. However, by means of suction ~ilters, pulps of a temperature higher than about 80C cannot be filtered by means of suction filters at a negative pressure of about 3 to 5 m H20. When higher temperatures are used, the filtrate starts boiling on the negative-pressure side.
Pulps ground under pressure etc., whose thick-ness is low, however, frequently occur at a temperature of about 100 to 105C. Pulps of a low thickr,ess contain an abundance o~ water~ for which reason their cooling is dif~icult. The object of the present invention is to sDlve the above problems.
In accordance with one embodiment of the present invention, there is provided a method for thickening of pulp slurry or suspension with a rotary disk filter partly submerged in the pulp slurry or suspension contained in a basin, comprising the steps of creating a positive pressure prevailing outside the filter faces of the disks for filtering~ in addition to filtering, continuously utilizing pressurized air for detaching the filtered pulp from the Eilter faces of the disks by passing the pressurized air into a sector of each filter disk that is at a detaching location, discharging the air in the sector through the Eilter face to outside the Eilter - Eace.
In such a case, filtering can be perEormed, e.g., within a temperature range of ~0 to 110C., preEerably 75 to 105C. The overpressure required is <5 m H2O, preferably
Pulps are thickened by means of various filters, e.g. drum or disk filters. An advantage o~ a disk filter as compared with a drum filter is that its filtering area is large in relation to the overall volume of space re-quired by the filter. When a disk filter is used~ an approximately 2- to 3-~old filtering area can be accommo-dated within the same floor area as compared with a drum filter. The construction and operation o~ disk filters are described, e.g.g in the Finnish Patents 54,o60 and 56,628.
In prior-art disk filters, the filtering pro-cess is produced by using suction inside the filter disks.
In that case, there is normal atmospheric pressure outside the disks. However, by means of suction ~ilters, pulps of a temperature higher than about 80C cannot be filtered by means of suction filters at a negative pressure of about 3 to 5 m H20. When higher temperatures are used, the filtrate starts boiling on the negative-pressure side.
Pulps ground under pressure etc., whose thick-ness is low, however, frequently occur at a temperature of about 100 to 105C. Pulps of a low thickr,ess contain an abundance o~ water~ for which reason their cooling is dif~icult. The object of the present invention is to sDlve the above problems.
In accordance with one embodiment of the present invention, there is provided a method for thickening of pulp slurry or suspension with a rotary disk filter partly submerged in the pulp slurry or suspension contained in a basin, comprising the steps of creating a positive pressure prevailing outside the filter faces of the disks for filtering~ in addition to filtering, continuously utilizing pressurized air for detaching the filtered pulp from the Eilter faces of the disks by passing the pressurized air into a sector of each filter disk that is at a detaching location, discharging the air in the sector through the Eilter face to outside the Eilter - Eace.
In such a case, filtering can be perEormed, e.g., within a temperature range of ~0 to 110C., preEerably 75 to 105C. The overpressure required is <5 m H2O, preferably
2 to 3 m H2O. 'rhereby, from an input thickness of 0.3 to 2~/
an output thickness of 10 to 25% can be reached. The method is suitable for use for thickening, among other things, of a low-thickness, hot, poorly filterable pulp slurry, such as, e.g., oE a pressure-ground pulp at the vortex-cleaner thickness.
In the method in accordance with the invention, the pressurized air can, besides for filtering, also be utilized for detaching the filtered pulp from the filter face. The system can be constructed closed, whereby the pressure can be produced easily. The pressure can be generated, e.g., by means of centrifugal blowers connected in series.
n 2a In accordance with another embodiment oE the present .invention, -there is provided a rotary disk -filter for thickening oE
pulp slurry or suspension, the Eilter comprising a basin, a hood placed above the basin, and filter disks mounted on a shaft, the filter disks including sectors and revolving in the basin, means for producing a positive pressure outside the filter aces of the disks including a longitudinal hollow space inside the shaft connected with a source of positive pressure and the disk sector, the disk sector being arranged at the detaching location of each aisk .
In the equipment .in accordance with the present inven-tion, the detaching position of the disks can be placed, in the direction of rotation of the disks, after the topmost position, and not before that position, which is the case in the disk filters known at present. In such a case, an area that is up to 90 larger, out of the face of the disks, can be used as drying area.
The effec-tive area is about 240, instead of the present about 150. For example, at a speed of 1 revolu~ion per minute, this increases the drying time by 15 seconds, which increases the output thickness by about 5 %.
The invention and its details will be described in more detail below with reference to the attached schematical drawings, wherein Figure 1 is a cross-sectional view of a disk filter in accordance with the inventiong Figure 2 is a longitudinal sectional view of the same filter, as viewed from above, Figure 3 is a cross-sectional view Or a disk filter in accordance with a second embodiment, and Figure 4 is a longitudinal sectional view of the filter shown in Fig. 3, as viewed from above.
In Figures 1 and 2, the reference numeral 1 denotes the basin into which the pulp to be thickened is passed through a distribution pipe 2. The disks 4 consisting Or sectors 3 are mounted on a shaft 5. In each sector there are two opposite filter faces 6 per-meable to water The sol;d partition walls 16 between the sectors separate the sectors from each other. The shaft 5 consists Or a hollow tube~ and inside the shaft there iæ a stationary, non~rotable hollow tube 14.
A hood 7 is fastened as sealed onto the basin.
Between the disks, at one side of the filter~
there are vertical tubes 8 as chutes, into which the filtered pulp is gathered from the filter faces. The lower ends of the vertical tubes 8 are united as a horizontal trough provided with a screw conveyor 9.
From the discharge screw 9 the pulp is fed into a tank or into a device, e.g. pulp pump 10, operating as a pressure lock on the outlet side.
Onto the hollow tube 14, a pipe 12 is connected towards the detaching position of each disk. The pipe 12 is connected to the rotary disk as gliding ~y means of a sealing shoe 13. The blow side of the blower 15 is con-nected to the inside space of the tube 14, and the suction side of the blower 15 is connected to the inside space Or the shaft 5.
When the filter operates, its disks rotate in the direction denoted with the arrow A in ~ig. 1. The pulp to be thickened is passed into the basin through the distribution ~ipe 2 ~arrow B). When a disk sector rises from the pulp slurry ~right side Or the disk 4 in Fig. 1)~ pulp remains on the sector faces and the filtrate is pressed by the overpressure into the sectors. From there the filtrate flows into the open pipe 5, from which it is drained off (arrows C and C'). Along with the filtrate, air also flows from outside the disks into the disks (arrows C').
The blower 15 blows air into the tube 14 (arrow D). From here the pressurized air passes through the pipes 12 into the sector of each disk that is in the detaching position (arrows D'). The pressurized air is discharged through the punched face of the sector to out-side the sector, at the same time detaching the filtered pulp placed on the outer face of the sector, the pulp falling into the tube 8 (arrow E). The pulp is removed by means of the screw 9 and of the pump 10. The pump 10 operates as a pressur~ lock on the discharge side.
In this way, the air coming from the blower enters through the sectors in the detaching position into the hood, whereat it forms the overpressure necessary there, detaches the pulp mat, and cleanses the wire at the same time. The air into the blower is sucked from inside the shaft tube 5 (arrow ~), whereby a closed air circulation is obtained.
Figures 3 and l~ show a second embodiment of the invention. In this embodiment, the interior space Or the shaft 5 is provided with longitudinal compartment walls 17 in thernselves known, rotating along with the shaft.
The sha~t compartments in this way formed are connected to the sector of each disk placed opposite such compart-ments. At the compartrnent 19 corresponding to the disk sector in the detaching position, at one end of the filter, there is a sealing shoe 18, which permits rota-tion Or the shaft 5 together with its compartments. The blo~ side of the blower 15 is, by means of the sealing shoe 18, connected to the shaft compartment 19 placed opposite the disk sector at each particular time in the detaching position. Thereby the pressurized air passes via this shaft compartment and the corresponding disk sector and detaches the ~iltered pulp mat from the face of the disk sector. In the other respects, the construc-tion and the operation of the filter correspond to what is illustrated in Figures 1 and 2.
an output thickness of 10 to 25% can be reached. The method is suitable for use for thickening, among other things, of a low-thickness, hot, poorly filterable pulp slurry, such as, e.g., oE a pressure-ground pulp at the vortex-cleaner thickness.
In the method in accordance with the invention, the pressurized air can, besides for filtering, also be utilized for detaching the filtered pulp from the filter face. The system can be constructed closed, whereby the pressure can be produced easily. The pressure can be generated, e.g., by means of centrifugal blowers connected in series.
n 2a In accordance with another embodiment oE the present .invention, -there is provided a rotary disk -filter for thickening oE
pulp slurry or suspension, the Eilter comprising a basin, a hood placed above the basin, and filter disks mounted on a shaft, the filter disks including sectors and revolving in the basin, means for producing a positive pressure outside the filter aces of the disks including a longitudinal hollow space inside the shaft connected with a source of positive pressure and the disk sector, the disk sector being arranged at the detaching location of each aisk .
In the equipment .in accordance with the present inven-tion, the detaching position of the disks can be placed, in the direction of rotation of the disks, after the topmost position, and not before that position, which is the case in the disk filters known at present. In such a case, an area that is up to 90 larger, out of the face of the disks, can be used as drying area.
The effec-tive area is about 240, instead of the present about 150. For example, at a speed of 1 revolu~ion per minute, this increases the drying time by 15 seconds, which increases the output thickness by about 5 %.
The invention and its details will be described in more detail below with reference to the attached schematical drawings, wherein Figure 1 is a cross-sectional view of a disk filter in accordance with the inventiong Figure 2 is a longitudinal sectional view of the same filter, as viewed from above, Figure 3 is a cross-sectional view Or a disk filter in accordance with a second embodiment, and Figure 4 is a longitudinal sectional view of the filter shown in Fig. 3, as viewed from above.
In Figures 1 and 2, the reference numeral 1 denotes the basin into which the pulp to be thickened is passed through a distribution pipe 2. The disks 4 consisting Or sectors 3 are mounted on a shaft 5. In each sector there are two opposite filter faces 6 per-meable to water The sol;d partition walls 16 between the sectors separate the sectors from each other. The shaft 5 consists Or a hollow tube~ and inside the shaft there iæ a stationary, non~rotable hollow tube 14.
A hood 7 is fastened as sealed onto the basin.
Between the disks, at one side of the filter~
there are vertical tubes 8 as chutes, into which the filtered pulp is gathered from the filter faces. The lower ends of the vertical tubes 8 are united as a horizontal trough provided with a screw conveyor 9.
From the discharge screw 9 the pulp is fed into a tank or into a device, e.g. pulp pump 10, operating as a pressure lock on the outlet side.
Onto the hollow tube 14, a pipe 12 is connected towards the detaching position of each disk. The pipe 12 is connected to the rotary disk as gliding ~y means of a sealing shoe 13. The blow side of the blower 15 is con-nected to the inside space of the tube 14, and the suction side of the blower 15 is connected to the inside space Or the shaft 5.
When the filter operates, its disks rotate in the direction denoted with the arrow A in ~ig. 1. The pulp to be thickened is passed into the basin through the distribution ~ipe 2 ~arrow B). When a disk sector rises from the pulp slurry ~right side Or the disk 4 in Fig. 1)~ pulp remains on the sector faces and the filtrate is pressed by the overpressure into the sectors. From there the filtrate flows into the open pipe 5, from which it is drained off (arrows C and C'). Along with the filtrate, air also flows from outside the disks into the disks (arrows C').
The blower 15 blows air into the tube 14 (arrow D). From here the pressurized air passes through the pipes 12 into the sector of each disk that is in the detaching position (arrows D'). The pressurized air is discharged through the punched face of the sector to out-side the sector, at the same time detaching the filtered pulp placed on the outer face of the sector, the pulp falling into the tube 8 (arrow E). The pulp is removed by means of the screw 9 and of the pump 10. The pump 10 operates as a pressur~ lock on the discharge side.
In this way, the air coming from the blower enters through the sectors in the detaching position into the hood, whereat it forms the overpressure necessary there, detaches the pulp mat, and cleanses the wire at the same time. The air into the blower is sucked from inside the shaft tube 5 (arrow ~), whereby a closed air circulation is obtained.
Figures 3 and l~ show a second embodiment of the invention. In this embodiment, the interior space Or the shaft 5 is provided with longitudinal compartment walls 17 in thernselves known, rotating along with the shaft.
The sha~t compartments in this way formed are connected to the sector of each disk placed opposite such compart-ments. At the compartrnent 19 corresponding to the disk sector in the detaching position, at one end of the filter, there is a sealing shoe 18, which permits rota-tion Or the shaft 5 together with its compartments. The blo~ side of the blower 15 is, by means of the sealing shoe 18, connected to the shaft compartment 19 placed opposite the disk sector at each particular time in the detaching position. Thereby the pressurized air passes via this shaft compartment and the corresponding disk sector and detaches the ~iltered pulp mat from the face of the disk sector. In the other respects, the construc-tion and the operation of the filter correspond to what is illustrated in Figures 1 and 2.
Claims (6)
1. A method for thickening of pulp slurry or suspension with a rotary disk filter partly submerged in the pulp slurry or suspension contained in a basin, comprising the steps of creating a positive pressure prevailing outside the filter faces of the disks for filtering, in addition to filtering, continuously utilizing pressurized air for detaching the filtered pulp from the filter faces of the disks by passing the pressurized air into a sector of each filter disk that is at a detaching location, discharging the air in the sector through the filter face to outside the filter face.
2. A rotary disk filter for thickening of pulp slurry or suspension, said filter comprising a basin, a hood placed above the basin, and filter disks mounted on a shaft, the filter disks including sectors and revolving in the basin, means for producing a positive pressure outside the filter faces of the disks including a longitudinal hollow space inside the shaft connected with a source of positive pressure and the disk sector, the disk sector being arranged at the detaching location of each disk.
3. A rotary disk filter as claimed in claim 2, wherein the shaft of the filter is an open tube and inside the shaft tube, there is provided a hollow tube one of whose ends is connected to the positive pressure side of a blower, and the position of the hollow tube placed opposite the sector of each disk placed at the detaching location is connected to the disk sector placed at the detaching location.
4. A rotary disk filter as claimed in claim 2, which disk filter includes a compartment shaft revolving along with the disks, whereby when the disks and the compartment shaft revolve, the compartment of the compartment shaft that is at each particular time, placed at the detaching location of the disks is, in its turn, in connection to the positive pressure side of a blower.
5. A rotary disk filter as claimed in claim 3 or 4, characterized in that the suction side of the blower is connected to a space inside the shaft, separate from the space connected to the positive pressure side of the blower.
6. A rotary disk filter as claimed in claim 2, wherein the disk sector connected with the positive pressure source is arranged after the topmost position, as viewed in the direction of rotation of the disks.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI803100A FI68005C (en) | 1980-09-30 | 1980-09-30 | FOERFARANDE FOER TJOCKNING AV MASS ELLER SUSPENSION OCH SKIVFILTER FOER TILLAEMPNING AV FOERFARANDET |
| CA000398677A CA1192142A (en) | 1980-09-30 | 1982-03-17 | Method for thickening of pulp slurry or suspension and disk filter for carrying out the method |
| AT0105882A AT373307B (en) | 1980-09-30 | 1982-03-17 | METHOD AND DISC FILTER FOR THICKENING A FIBER FIBER SUSPENSION |
| DE19823210200 DE3210200A1 (en) | 1980-09-30 | 1982-03-19 | Process for thickening a pulp mixture or a sludge and a disc filter for application of the process |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI803100A FI68005C (en) | 1980-09-30 | 1980-09-30 | FOERFARANDE FOER TJOCKNING AV MASS ELLER SUSPENSION OCH SKIVFILTER FOER TILLAEMPNING AV FOERFARANDET |
| CA000398677A CA1192142A (en) | 1980-09-30 | 1982-03-17 | Method for thickening of pulp slurry or suspension and disk filter for carrying out the method |
| DE19823210200 DE3210200A1 (en) | 1980-09-30 | 1982-03-19 | Process for thickening a pulp mixture or a sludge and a disc filter for application of the process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1192142A true CA1192142A (en) | 1985-08-20 |
Family
ID=37776575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398677A Expired CA1192142A (en) | 1980-09-30 | 1982-03-17 | Method for thickening of pulp slurry or suspension and disk filter for carrying out the method |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT373307B (en) |
| CA (1) | CA1192142A (en) |
| DE (1) | DE3210200A1 (en) |
| FI (1) | FI68005C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7005067B2 (en) | 2000-12-12 | 2006-02-28 | Gl&V Management Hungary Kft | Disc-type filtration apparatus including discharge collector internal to pressure vessel and method filtration |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3438170A1 (en) * | 1984-10-18 | 1986-04-24 | Mecapec S.A., Schmerikon | SYSTEM FOR MECHANICAL WASTE WATER TREATMENT |
| DE3528429A1 (en) * | 1985-08-08 | 1987-02-12 | Voith Gmbh J M | DISC THICKER |
| US5156750A (en) * | 1987-07-08 | 1992-10-20 | A. Ahlstrom Corporation | Method and apparatus for thickening a fiber suspension and removing fine particles therefrom |
| FI81725C (en) * | 1987-11-05 | 1990-12-10 | Ahlstroem Oy | Method and apparatus for treating fiber suspension |
| DE4425451A1 (en) * | 1994-07-19 | 1996-01-25 | Kloeckner Humboldt Deutz Ag | Continuous removal of heavy filter-cake from a pressure filter |
| FI111812B (en) * | 2000-12-08 | 2003-09-30 | Outokumpu Oy | filtering method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE710492C (en) * | 1937-11-07 | 1941-09-15 | Peter Wilhelm Hartmann | Cellless rotary drum suction filter for sludge and waste water |
| FI54060C (en) * | 1976-09-14 | 1978-10-10 | Rauma Repola Oy | SKIVFILTER |
| FI56628C (en) * | 1976-09-14 | 1980-03-10 | Rauma Repola Oy | SKIVFILTER FOER FILTRERING AV FIBERHALTING MATERIAL |
| DE2947329C2 (en) * | 1979-11-23 | 1982-01-28 | Werner Prof. Dr. 6740 Landau Stahl | Filtration arrangement |
-
1980
- 1980-09-30 FI FI803100A patent/FI68005C/en not_active IP Right Cessation
-
1982
- 1982-03-17 CA CA000398677A patent/CA1192142A/en not_active Expired
- 1982-03-17 AT AT0105882A patent/AT373307B/en not_active IP Right Cessation
- 1982-03-19 DE DE19823210200 patent/DE3210200A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7005067B2 (en) | 2000-12-12 | 2006-02-28 | Gl&V Management Hungary Kft | Disc-type filtration apparatus including discharge collector internal to pressure vessel and method filtration |
Also Published As
| Publication number | Publication date |
|---|---|
| FI68005C (en) | 1985-07-10 |
| DE3210200C2 (en) | 1991-09-12 |
| DE3210200A1 (en) | 1983-09-29 |
| AT373307B (en) | 1984-01-10 |
| FI68005B (en) | 1985-03-29 |
| FI803100A (en) | 1982-03-31 |
| ATA105882A (en) | 1983-05-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 20020820 |