AT400562B - METHOD FOR SEPARATING UNWANTED SUBSTANCES FROM SLUDGE MIXING IN LIQUID AND SOLID - Google Patents
METHOD FOR SEPARATING UNWANTED SUBSTANCES FROM SLUDGE MIXING IN LIQUID AND SOLID Download PDFInfo
- Publication number
- AT400562B AT400562B AT0208292A AT208292A AT400562B AT 400562 B AT400562 B AT 400562B AT 0208292 A AT0208292 A AT 0208292A AT 208292 A AT208292 A AT 208292A AT 400562 B AT400562 B AT 400562B
- Authority
- AT
- Austria
- Prior art keywords
- sludge
- liquid
- flue gas
- gas desulfurization
- hydrocyclone
- Prior art date
Links
- 239000010802 sludge Substances 0.000 title claims description 23
- 239000007788 liquid Substances 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 9
- 239000000126 substance Substances 0.000 title claims description 6
- 239000007787 solid Substances 0.000 title claims description 5
- 239000003546 flue gas Substances 0.000 claims description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052602 gypsum Inorganic materials 0.000 claims description 6
- 239000010440 gypsum Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000010801 sewage sludge Substances 0.000 claims description 6
- 239000004071 soot Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 239000000356 contaminant Substances 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims 1
- 230000001580 bacterial effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000006386 neutralization reaction Methods 0.000 claims 1
- 230000008092 positive effect Effects 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000008237 rinsing water Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/36—Devices therefor, other than using centrifugal force
- B03B5/38—Devices therefor, other than using centrifugal force of conical receptacle type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
- B03B5/623—Upward current classifiers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Silicon Compounds (AREA)
Description
AT 400 562 BAT 400 562 B
Die Erfindung betrifft ein Verfahren zur Trennung unerwünschter Stoffe, wie z. B. Ruß, Schwermetalle und organische Verunreinigungen, aus sich in Flüssigkeit und Feststoff entmischenden Schlamm, wie z. B. Klärschlamm oder Schlamm aus einer nassen Rauchgasentschwefelungsstute, und Gewinnung von Wertstoffen wie z. B. Gips, Kieselsäure oder schwermetallfreien Klärschlamm bzw. einer Kläranlage zuführbaren Flüssigkeit, durch Sedimentation.The invention relates to a method for separating undesirable substances, such as. As soot, heavy metals and organic contaminants from sludge segregating in liquid and solid, such as. B. sewage sludge or sludge from a wet flue gas desulfurization mare, and recovery of valuable materials such. B. gypsum, silica or heavy metal-free sewage sludge or a liquid that can be fed to a sewage treatment plant, by sedimentation.
Aus der DE-AS 1,442.386 bzw. 2,408.776 oder US-PS 5,062.953 sowie GB-PS 2,074.050 ist es bekannt, Schlämme durch Absetzen oder durch Zentrifugieren zu entwässern, wobei die überstehende Flüssigkeit relativ sauber ist. Die abgesetzten Schlämme beinhalten alle absetzbaren Stoffe, sodaß die Weiterverarbeitung erschwert wird und ihnen oftmals Sondermüllstatus, insbesondere bei mit Schwermetall verunreinigten Schlämmen, zugeordnet werden muß. Bei der näßen Rauchgasreinigung nach ölfgefeuerten Dampferzeugern ist bei Entschwefelungsanlagen die Schwefelkalkverbindung oftmals mit Ruß verunreinigt und dadurch nicht zu Gips weiterverarbeitbar. Bei Klärschlamm begrenzt der Schwermetallgehalt die Verwendung in der Landwirtschaft und ist auch bei der Verbrennung eine unerwünschte Beimischung. In der Ablauge von Zellstoffabriken, insbesondere bei der Verwertung von Einjahrespflanzen stört die Kieselsäure, die zur Verwertung in körniger Form ausgeschleust werden soll.From DE-AS 1,442,386 or 2,408,776 or US-PS 5,062,953 and GB-PS 2,074,050 it is known to dewater sludge by settling or by centrifuging, the supernatant liquid being relatively clean. The settled sludge contains all settable substances, so that further processing is made more difficult and special waste status often has to be assigned to them, especially in the case of sludge contaminated with heavy metal. In wet flue gas cleaning after oil-fired steam generators in desulfurization plants, the sulfur lime compound is often contaminated with soot and therefore cannot be processed into gypsum. With sewage sludge, the heavy metal content limits its use in agriculture and is also an undesirable admixture during combustion. In the waste liquor from pulp factories, particularly when recycling annual plants, the silica, which is to be discharged in granular form for recycling, is a problem.
Die Erfindung hat es sich zur Aufgabe gestellt, den oben genannten Schwierigkeiten zu begegnen und ist dadurch gekennzeichnet, daß der sich absetzende Schlamm unter ständigem Rühren und Aufrechterhalten einer dichten Suspension in einem Becken absetzen gelassen wird sowie zur Verbesserung der Trennschärfe durch einen Spülwasserstrom im Kreuzgegenstrom bzw. im Gegenstrom geführt wird und die aufschwimmende Fraktion, insbesondere in Form einer dünnen Suspension, abgeführt oder nach einer Eindickung in einem Hydrozyklon einer weiteren Klassierung zugeführt wird. Ausgestaltungen der Erfindung sind in den Unteransprüchen 2 und 3 angegeben. In den Unteransprüchen 4 und 5 sind Ausgestaltungen der Erfindung für den Anwendungsbereich Rauchgasentschwefelung angegeben.The invention has set itself the task of addressing the difficulties mentioned above and is characterized in that the settling sludge is allowed to settle in a basin with constant stirring and maintaining a dense suspension and to improve the selectivity by a flushing water flow in cross-countercurrent or is conducted in countercurrent and the floating fraction, in particular in the form of a thin suspension, is discharged or, after thickening in a hydrocyclone, is fed to a further classification. Embodiments of the invention are specified in subclaims 2 and 3. Embodiments of the invention for the field of application of flue gas desulfurization are specified in subclaims 4 and 5.
Die Erfindung ist in den angeschlossenen Figuren 1 und 2 in Form eines Schaltbildes beispielsweise dargestellt.The invention is shown in the attached Figures 1 and 2, for example in the form of a circuit diagram.
Aus einer Schlammquelle 1, die als Kläranlage (Fig. 2) oder auch als Sumpf eines Wäschers (Fig. 1) einer näßen Rauchgasreinigungsanlage, insbesondere SO2 Absorptionsanlage nach einer Staubabscheidung ausgebildet ist, fällt unreiner Schlamm an, der in einem Hydrozyklon 2 eingedickt wird. Die dünne Fraktion wird in die Schlammquelle zurückgeführt (Wasserrücklauf oder als Schlammrückführung) während die dichtere Fraktion über die Leitung 3 einem Absetzbehälter 4 zugeführt wird. Im Absetzbehälter 4 ist ein Rührwerk 5 vorgesehen, welches den Inhalt des Absetzbehälters in Bewegung hält, wobei sich im unteren Teil desselben die Suspension verdichtet und die Verunreinigungen aufschwimmen. Dieser Aufschwimmeffekt wird durch die Spülwasserzuführung 6 unterstützt, wodurch der Klassierungseffekt verbessert wird. Der Überlauf wird gesammelt und einem weiteren Hydrozyklon 7 zugeführt, in welchem der Überlauf verdickt und einem weiteren Absetzbehälter mit Rührwerk 5' zugeführt wird. Die dünne Fraktion des Hydrozyklon 7, kann beispielsweise als Spülwasser 6 bzw. 6' verwendet oder in den Naßwäscher eingedüst werden. Auch im Absetzbehälter 8 bildet sich eine verunreinigte Flüssigkeit, die entweder direkt in den Vorfluter oder über ein Absetzbecken 9, insbesondere mit einem Flockungsmittel 10 versetzt, geleitet wird, sodaß die Flüssigkeit von absetzbaren Stoffen gereinigt wird und als Brauchwasser Verwendung finden kann. Der abgesetzte Schlamm wird deponiert oder als Grundstoff für die Erzeugung von Schwermetallen oder als Zusatzbrennstoff (Ruß) verwendet. Der Ruß kommt aus Verbrennungsanlagen und läßt sich erst bei einer Naßwäsche des Rauchgases abscheiden.From a sludge source 1, which is designed as a sewage treatment plant (FIG. 2) or as the sump of a scrubber (FIG. 1) of a wet flue gas cleaning system, in particular an SO2 absorption system, after a dust separation, impure sludge is obtained, which is thickened in a hydrocyclone 2. The thin fraction is returned to the sludge source (water return or as sludge return) while the denser fraction is fed via line 3 to a settling tank 4. In the settling tank 4, an agitator 5 is provided which keeps the contents of the settling tank in motion, the suspension compressing in the lower part thereof and the impurities floating up. This floating effect is supported by the rinse water supply 6, which improves the classification effect. The overflow is collected and fed to a further hydrocyclone 7, in which the overflow is thickened and fed to a further settling tank with an agitator 5 '. The thin fraction of the hydrocyclone 7 can, for example, be used as rinsing water 6 or 6 'or can be injected into the wet scrubber. A contaminated liquid also forms in the settling tank 8, which is either passed directly into the receiving water or through a settling basin 9, in particular with a flocculant 10, so that the liquid is cleaned of settable substances and can be used as process water. The settled sludge is deposited or used as a raw material for the production of heavy metals or as an additional fuel (soot). The soot comes from incinerators and can only be separated when the flue gas is washed wet.
Der in den Absetzbecken 4 bzw. 8 anfallende Schlamm ist relativ rein und kann als Wertstoff 11, beispielsweise für die Gipserzeugung oder bei Klärschlamm für landwirtschaftliche Zwecke genutzt werden. Wesentlich ist hiebei, daß der im Absetzbehälter 4. anfallende Schlamm reiner als jener im Absetzbehälter 8 ist, sodaß wenn die Reinheitstoleranzen überschritten werden, der Schlamm aus dem Absetzbehälter 8 in den Absetzbehälter 4 rückgeführt (strichlierte Linie) oder einer Deponie 12 zugeführt werden kann. Auf jeden Fall wird erreicht, daß die Deponiemenge bedeutend reduziert wird.The sludge accumulating in the sedimentation tanks 4 and 8 is relatively pure and can be used as a valuable material 11, for example for the production of gypsum or in the case of sewage sludge for agricultural purposes. It is important here that the sludge accumulating in the settling tank 4 is purer than that in the settling tank 8, so that if the purity tolerances are exceeded, the sludge can be returned from the settling tank 8 to the settling tank 4 (dashed line) or to a landfill 12. In any case, the amount of landfill is reduced significantly.
Bei der Gipssuspension entstehend bei einer absorptiven SO2 Abscheidung mit Kalk aus Verbrennungsgasen, insbesondere bei ölfgefeuerten Dampferzeugern, verbessert sich durch die Rußabscheidung die Filtrierbarkeit, wodurch bei der anschließenden Trocknung der Feststoffe der Energieverbrauch verringert wird. Die erzeugten Gipspellets erreichen eine höhere Festigkeit, und das anschließende Handling (Zwischenlagerung, Transport) führt zu geringeren Staubverlusten.In the gypsum suspension, an absorptive SO2 separation with lime from combustion gases, especially with oil-fired steam generators, improves the filterability due to the soot separation, which reduces the energy consumption during the subsequent drying of the solids. The gypsum pellets produced have a higher strength and the subsequent handling (intermediate storage, transport) leads to less dust loss.
Im Rahmen der Erfindung lassen sich auch Hydroxide abtrennen, wodurch das gewonnene Salz bzw. der Schlamm reiner ist und der Absorptionsmittelverlust im als Absorber ausgebildeten Naßwäscher durch Rückführung der Hydroxide geringer wird.Within the scope of the invention, hydroxides can also be separated off, as a result of which the salt or sludge obtained is purer and the loss of absorbent in the wet scrubber designed as an absorber is reduced by recycling the hydroxides.
In Fig, 2 wird bei einer Schwarzlaugenentkieselung nach Abtrennung der entkieselten Lauge der über die Leitung 3 anfallende Schlamm in einem Absetzbehälter 4 gerührt, wobei die feinen Kristalle mit den 2In FIG. 2, in the case of black liquor decilification after separating the decalcified liquor, the sludge obtained via line 3 is stirred in a settling tank 4, the fine crystals with the second
Claims (5)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0208292A AT400562B (en) | 1992-10-21 | 1992-10-21 | METHOD FOR SEPARATING UNWANTED SUBSTANCES FROM SLUDGE MIXING IN LIQUID AND SOLID |
| DE19934331322 DE4331322C2 (en) | 1992-10-21 | 1993-09-15 | Process for separating undesired substances from segregating sludge |
| SE9303404A SE508367C2 (en) | 1992-10-21 | 1993-10-15 | Procedure for separating unwanted substances from sludge |
| FI934620A FI934620L (en) | 1992-10-21 | 1993-10-20 | Foerfarande Foer avskiljning av ooenskade aemnen ur slam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0208292A AT400562B (en) | 1992-10-21 | 1992-10-21 | METHOD FOR SEPARATING UNWANTED SUBSTANCES FROM SLUDGE MIXING IN LIQUID AND SOLID |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ATA208292A ATA208292A (en) | 1995-06-15 |
| AT400562B true AT400562B (en) | 1996-01-25 |
Family
ID=3527376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT0208292A AT400562B (en) | 1992-10-21 | 1992-10-21 | METHOD FOR SEPARATING UNWANTED SUBSTANCES FROM SLUDGE MIXING IN LIQUID AND SOLID |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT400562B (en) |
| DE (1) | DE4331322C2 (en) |
| FI (1) | FI934620L (en) |
| SE (1) | SE508367C2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT400929B (en) * | 1994-11-18 | 1996-04-25 | Austrian Energy & Environment | METHOD FOR OBTAINING A CLEANED GRANULAR REACTION PRODUCT |
| DE29710644U1 (en) * | 1997-06-18 | 1997-08-14 | Schunk, Jürgen, 85614 Kirchseeon | Pond water treatment facility |
| DE102009034494A1 (en) | 2009-07-22 | 2011-03-10 | Uhde Gmbh | Continuous soot water treatment |
| CN112619213A (en) * | 2020-12-08 | 2021-04-09 | 彝良驰宏矿业有限公司 | Discharging device of thickener |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1442386B (en) * | Daimler-Benz Ag, 7000 Stuttgart | Cleaning device for soiled liquids, in particular grinding water | ||
| DE2408776B2 (en) * | 1973-03-16 | 1976-04-22 | Sweco, Inc., Los Angeles, Calif. (V.St.A.) | DEVICE FOR CLEANING DRILLING MUD |
| GB2076050A (en) * | 1980-05-17 | 1981-11-25 | Mainprize David | Capacitive discharge ignition systems |
| US5062963A (en) * | 1989-03-17 | 1991-11-05 | Devilbiss (Canada) Limited | Method and apparatus for removing sludge from a spray booth |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL223480A1 (en) * | 1980-04-14 | 1981-10-16 | Kopalnia Wegla Kamiennego Gen |
-
1992
- 1992-10-21 AT AT0208292A patent/AT400562B/en not_active IP Right Cessation
-
1993
- 1993-09-15 DE DE19934331322 patent/DE4331322C2/en not_active Expired - Fee Related
- 1993-10-15 SE SE9303404A patent/SE508367C2/en not_active IP Right Cessation
- 1993-10-20 FI FI934620A patent/FI934620L/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1442386B (en) * | Daimler-Benz Ag, 7000 Stuttgart | Cleaning device for soiled liquids, in particular grinding water | ||
| DE2408776B2 (en) * | 1973-03-16 | 1976-04-22 | Sweco, Inc., Los Angeles, Calif. (V.St.A.) | DEVICE FOR CLEANING DRILLING MUD |
| GB2076050A (en) * | 1980-05-17 | 1981-11-25 | Mainprize David | Capacitive discharge ignition systems |
| US5062963A (en) * | 1989-03-17 | 1991-11-05 | Devilbiss (Canada) Limited | Method and apparatus for removing sludge from a spray booth |
Also Published As
| Publication number | Publication date |
|---|---|
| FI934620A7 (en) | 1994-04-22 |
| FI934620A0 (en) | 1993-10-20 |
| SE508367C2 (en) | 1998-09-28 |
| ATA208292A (en) | 1995-06-15 |
| SE9303404L (en) | 1994-04-22 |
| DE4331322A1 (en) | 1994-04-28 |
| SE9303404D0 (en) | 1993-10-15 |
| DE4331322C2 (en) | 1996-03-28 |
| FI934620L (en) | 1994-04-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ELJ | Ceased due to non-payment of the annual fee |