EP0935513A2 - Procede et dispositif pour le recyclage d'agents abrasifs utilises dans la decoupe par jet d'eau - Google Patents

Procede et dispositif pour le recyclage d'agents abrasifs utilises dans la decoupe par jet d'eau

Info

Publication number
EP0935513A2
EP0935513A2 EP97949858A EP97949858A EP0935513A2 EP 0935513 A2 EP0935513 A2 EP 0935513A2 EP 97949858 A EP97949858 A EP 97949858A EP 97949858 A EP97949858 A EP 97949858A EP 0935513 A2 EP0935513 A2 EP 0935513A2
Authority
EP
European Patent Office
Prior art keywords
water
cutting
coarse
classifier
basin
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.)
Ceased
Application number
EP97949858A
Other languages
German (de)
English (en)
Inventor
Hans-Günter Weide
Gerhard Hering
Jörn SCHATZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intrec Gesellschaft fur Innovative Technologien Mbh
Original Assignee
Intrec Gesellschaft fur Innovative Technologien Mbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Intrec Gesellschaft fur Innovative Technologien Mbh filed Critical Intrec Gesellschaft fur Innovative Technologien Mbh
Publication of EP0935513A2 publication Critical patent/EP0935513A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/006—Treatment of used abrasive material
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the invention relates to a method and a device for recycling the portion of cutting material which is produced and reusable in sandblasting, in particular in abrasive high-pressure waterjet cutting, and for producing a dischargeable wastewater.
  • a high separating effect can be achieved with water jet cutting, provided that a thin jet of this suspension is applied to the material to be cut at high speed and thus high kinetic energy is judged.
  • the achievable cutting parameters for a given cutting substance are, apart from their chemical and physical properties (interaction with the material to be cut, hardness, etc.), very much dependent on the grain size and shape (spherical-round, angular-sharp-edged) of the corresponding particles.
  • the grain parameters are changed already during the acceleration phase of the particles in the suspension, but also due to the mechanical interaction with the material to be cut.
  • the cutting means changed after the cutting work has been carried out. together with the cutting material abrasion generated in a pool filled with water or solids, in which it is collected, suspended and discharged. It is customary to dispose of or process the used abrasive using a more or less complex administrative procedure. Most of the now contaminated water remains in the process as process water, a small proportion of which is often discharged into the sewer with a process-related suspended matter component.
  • the utility model G 93 08 809.4 describes, as a sub-step for sorting the waste sludge from abrasive jet cutting, a device known as a flow separator, consisting of a horizontally positioned pipe, through the inlet connection of which the resulting suspension is let in and whirled up by another medium.
  • a flow separator consisting of a horizontally positioned pipe, through the inlet connection of which the resulting suspension is let in and whirled up by another medium.
  • EP 0 502 461 AI discloses a method and a system for recovering abrasive abrasive material during water jet cutting, the abrasive material deposited on the tub bottom being transported horizontally to a lifting position and being lifted up from there out of the tub and out of the tub the abrasive material that has been removed is then subjected to drying by means of a UV lamp, after which the dried abrasive material is suspended in an air stream and finally collected in different size fractions.
  • a disadvantage of this solution is that both the coarse grain and the fine constituents are dried, although only the coarse constituents can be reused. UV drying is also ineffective. In addition, a dry material made of coarse and fine components tends to cake.
  • DE 43 03 868 AI describes a method and a plant for the separation and recovery of abrasives in water abrasive jet applications, the separation being realized by hydrocyclones.
  • the particular disadvantage here is that an additional centrifugal force has to be generated and discontinuous operation is problematic.
  • the invention is therefore based on the object of providing a method and a device which improve the prior art mentioned, with which an effective, reproducible separation of particles of different grain size and shape is possible and the process water entering the wastewater is largely cleaned.
  • the device should be inexpensive to manufacture and easy to operate and maintain, and should be flexibly adaptable to specific applications and have a long service life.
  • a particular advantage of the invention is that an effective recovery of the abrasives is achieved by rinsing the fine-grained particles in an upflow, sedimenting them by calming the flow, then filtering and collecting a certain proportion and removing the coarse-grained particles, mechanically pre-dewatered, dried and be reused.
  • a partial flow of the process water can be pumped through a filter unit, so that a conductive filtrate is obtained.
  • sorting takes place at the same time according to the density-different cutting material particles involved in the sedimenting separation process, so that it was initially assumed that, if cutting material with a higher density than that of the cutting agent, for example Almandine is present, which can also get into the recycled portion in an undesirable manner.
  • Fig. 2 shows a schematic diagram of a bypass.
  • the mixture in the cutting basin also called catcher, after the cutting process, consisting of coarse and fine abrasive and small amounts of material to be cut, predominantly of the finest grain size, is fed by means of a suspension pump Pl designed as a diaphragm pump, whose flow rate in the present exemplary embodiment is approximately 4 m 3 per hour after passing a sieve (not shown in FIG. 1) into an upstream classifier 1, in which the separation into the coarse-grained reusable abrasive fraction and into the fine fraction to be collected takes place.
  • a suspension pump Pl designed as a diaphragm pump, whose flow rate in the present exemplary embodiment is approximately 4 m 3 per hour after passing a sieve (not shown in FIG. 1) into an upstream classifier 1, in which the separation into the coarse-grained reusable abrasive fraction and into the fine fraction to be collected takes place.
  • the sieve with a plastic bottom with a mesh size of 600 ⁇ m causes the separation of foreign components that are considerably larger in relation to the granular material to be cut, such as flaked stony cuttings or other foreign components that have entered the suspension, such as the smallest cutting material residues that have fallen through the sieve in the cutting basin. At the same time, it reduces the speed of the volume flow of 2.3 m / s entering classifier 1 by more than ten times. In classifier 1, the separation takes place according to the grain size, in that the coarse particles, the sinking speed of which is greater than or at least equal to that of the upward flowing water flow, sink downwards, but the finer grain reaches the overflow with the water flow.
  • the classifier 1 is equipped with a tangential slurry inlet. To protect against shipping, it is automatically emptied before decommissioning.
  • the classifier 1 in the present exemplary embodiment with its dimensions, height 0.8 m, diameter 0.3 m, is designed for a clearing surface load of 1.6 cm / s at a suspension volume flow of 4 m 3 / h for a separation grain of 100 ⁇ m and specially configured for a cutting operation.
  • the bottom of the classifier 1 is designed as a nozzle plate.
  • a fluidized bed enriched with coarse material is formed above this perforated plate, in which it is subjected to an intensive rinsing / washing process, the fluidized bed essentially containing the hydrostatic pressure determined on the bottom of the container.
  • the nozzle plate is also possible to design the nozzle plate as a perforated plate over which an elastic mat, made of silicone, for example, is attached. These slots are opened under inflowing water pressure and create like that Nozzle plate an ascending pure water flow in the classifier 1.
  • a pressure transducer was installed to record a differential pressure that is related to an equally high water column, the signal of which controls a servomotor via a controller, which in turn actuates the floor outlet. If the bottom outlet opens, a steady or interrupted flow of recycled thick matter enters the intermediate bulk container 3, from which it is conveyed by means of a conveyor device 3a, e.g. a screw conveyor, into the dryer 4 and after passing through it into the dry goods container 5.
  • the intermediate bulk goods container 3 is designed as a trough with an inclined wall on one side and an adjustable overflow. The level of the sand is sensed and is linked to the dryer 4 and the suspension pump P1 via an NC control.
  • the intermediate coarse material container 3 is equipped with a device which, in the event of an increased underflow quantity and / or a high sand level, minimizes the quantity of coarse material which undesirably enters the reserve pool 6. It can be adjusted in position, that is to say so that the water overflow edge forms a horizontal plane and the water flowing over it reaches the reserve basin 6 via a circumferential drainage channel.
  • the sediment located in the intermediate bulk container 3 is conveyed by means of a mechanical conveyor 3a, preferably by a slow-moving screw conveyor, into the wet goods feed container of the dryer 4 in such a way that it is supported to a certain extent, for example by perforations in the Boundary wall surrounding the screw, is mechanically pre-dewatered.
  • the inclination and length of the part of the conveying device 3a projecting above the water level are dimensioned in such a way that they enable mechanical pre-dewatering to 10-20% by mass of the moist material entering the dryer 4.
  • Transport through the dryer 4 is carried out by a revolving steel link belt, into the cavities of which the moist material is introduced.
  • a special, self-adjusting applicator roller in the present exemplary embodiment a rubber transverse roller 8, is arranged in between to evenly distribute the goods offered by the conveying device 3a over the intended mesh width.
  • the steel mesh moves the moisture in it into the drying zone, where it is washed around on both sides, preferably with preheated (dry) air - recovered from the high-pressure pump cooling or from the cutting basin - with dehydration of the material and humidification of the desiccant in countercurrent.
  • heating elements are also arranged on one or both sides next to the braid near the air inlet at the lower part of the dryer 4.
  • the dryer 4 which can be expanded, is designed for a moisture content from 12 kg / h. Because of the broader grain spectrum of the abrasive compared to the originally used cutting agent, the favorable cutting parameters achieved were similar to those achieved using high-quality commercial garnet sand.
  • Overflow suspension arrives in a special device consisting of a combination of lamella clarifier 2a, sedimentation basin 2b and removal device 2c (e.g. filter bag), in which, for example, the lamella clarification part 2a stands detachably on a sealing layer directly on the sedimentation basin 2b and solely by its weight or guarantees the watertightness of the connection point in another suitable manner.
  • the lamella clarification part 2a stands detachably on a sealing layer directly on the sedimentation basin 2b and solely by its weight or guarantees the watertightness of the connection point in another suitable manner.
  • the correct, immovable position of the attached lamella clarifying part 2a is ensured by the attached guide element.
  • the upper basin that is to say the lamella clarifier 2a
  • the other basin that is to say the sales basin 2b
  • the lower settling tank 2b fills first and then the upper lamella clarifying part 2a.
  • the suspension initially flows horizontally / downwards into the lamella clarifier 2a from the side inlet of the suspension.
  • the current reverses and flows upwards across the entire clarification cross-section between the plates.
  • the sludge deposited on the plates slides downward against the flow and, after detaching from the lower end of the plate, falls directly into the removal device 2c designed as a fine material collection bag, in which it remains for a few days or weeks until the time of removal and can thus achieve a high degree of compression.
  • the degree of filling or the time of removal is indicated by means of a sensor attached to the settling basin 2b, for example using the bottom plate deflection caused by the sludge weight or a stirring sensor or in another suitable manner.
  • the water in the lamella clarifier 2a and settling basin 2b is first removed by means of an outlet Fes completely drained at the bottom
  • the filter bag in this sedimentation tank retains the solids. After lifting off the clarifier container part which is not firmly connected to the remaining heel basin 2b, the fine material sack can be removed.
  • the filter bag in this sedimentation tank retains the solids.
  • Another lamella clarifier 2a can be operated in parallel to avoid downtimes when changing the fine material bag.
  • the filter pump P4 for feeding the filter unit 9 and the upstream water pump P3, which are most remote from the lower wall, are located, each taking clean water near the surface.
  • a process water bypass is branched off via a filter pump P4 and fed to a filter unit 9 leads, the effect of which is dimensioned such that - since decoupled from the process water circuit - only the amount of water entered into the cutting basin 10 with the abrasive water jet due to operation and settling and / or filtration, if necessary using flocculants, needs to be subsequently cleaned so that it can be discharged into the sewer according to water law requirements.
  • the largely cleared process water - taken from the (internal) sedimentation chamber located within the reserve pool 6 - is only fed to the filter unit 9 (1 ⁇ m pore size) in a controlled amount for fine clarification, which is entered into the system via a cutting head .
  • the water leaving the filter unit 9 is free of recognizable cloudiness for almost the entire filter service life. Its solids content is ⁇ 5 mg / 1.
  • the filter resistance increases, the final size or the time of change is indicated by a conventional differential pressure sensor.
  • As a suspension or Return flow pumps use robust electric diaphragm pumps. Due to their arrangement in the upper part of the plant, the cutting basin 10 is reliably avoided when the pump is at a standstill.
  • a bypass 13 shown in FIG. 2 and provided with switching modules is arranged between the upflow classifier 1 and the lamella clarifier 2a.
  • This bypass 13 causes or enables a low solids water circuit is realized during a limited "start-up” and “shutdown” operating regime, which practically prevents line blockages.
  • Bypassing the upstream classifier 1, the suspension sucked out of the cutting pool 10 can, if necessary, be wholly or partially returned to the latter, for example to avoid overloading the upstream classifier 1, or the suspension can be fed directly to the lamella clarifier 2a.
  • the bypass 13 has actuating elements 11 for opening / closing the flaps 12 and an entrance from the cutting basin 10 and exits to the upflow classifier 1, to the lamella clarifier 2a and back to the cutting basin 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Processing Of Solid Wastes (AREA)
  • Disintegrating Or Milling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour le recyclage de sables, par exemple pour le recyclage d'une fraction réutilisable d'agents de coupe apparaissant lors de la découpe au jet de sable, en particulier lors de la découpe par jet d'eau haute pression en milieu abrasif, ainsi que pour la production d'eaux résiduaires pouvant être introduites dans un circuit. Le procédé est caractérisé en ce que, dans un courant ascendant, les particules à grains fins sont rincées, sédimentées en phase d'écoulement calme, puis filtrées et collectées, et les particules à gros grains sont transportées, prédéshydratées mécaniquement, séchées et envoyées à la réutilisation. Le dispositif selon l'invention comprend essentiellement au moins un classificateur fonctionnant suivant le principe de séparation à courant ascendant, connecté, côté trop-plein, avec au moins un parcours à fines particules, comprenant un clarificateur à tôles inclinées, un bassin de décantation et un dispositif de prélèvement et un décanteur final et, côté sortie, avec au moins un parcours à grosses particules, comprenant un réservoir intermédiaire à grosses particules, un sécheur, un réservoir à produit séché, ainsi que des pompes pompant, à partie du bassin de coupe, l'eau chargée de matières solides, et recyclant l'eau en provenance du parcours à fines particules et à grosses particules, sous forme d'eaux industrielles dans le bassin de coupe.
EP97949858A 1996-10-24 1997-10-23 Procede et dispositif pour le recyclage d'agents abrasifs utilises dans la decoupe par jet d'eau Ceased EP0935513A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19645142 1996-10-24
DE19645142A DE19645142A1 (de) 1996-10-24 1996-10-24 Verfahren und Vorrichtung zum Recyceln von Sanden
PCT/DE1997/002512 WO1998017439A2 (fr) 1996-10-24 1997-10-23 Procede et dispositif pour le recyclage d'agents abrasifs utilises dans la decoupe par jet d'eau

Publications (1)

Publication Number Publication Date
EP0935513A2 true EP0935513A2 (fr) 1999-08-18

Family

ID=7810431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97949858A Ceased EP0935513A2 (fr) 1996-10-24 1997-10-23 Procede et dispositif pour le recyclage d'agents abrasifs utilises dans la decoupe par jet d'eau

Country Status (4)

Country Link
EP (1) EP0935513A2 (fr)
AU (1) AU5306098A (fr)
DE (1) DE19645142A1 (fr)
WO (1) WO1998017439A2 (fr)

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US5991525A (en) 1997-08-22 1999-11-23 Voyan Technology Method for real-time nonlinear system state estimation and control
US6299510B1 (en) 1998-04-28 2001-10-09 Flow International Corporation Abrasive removal system for use with high-pressure fluid-jet cutting device
US6328638B1 (en) * 1998-04-28 2001-12-11 Flow International Corporation Apparatus and methods for recovering abrasive from an abrasive-laden fluid
MY123696A (en) * 1999-04-28 2006-05-31 Shell Int Research Abrasive jet drilling assembly
US6379214B1 (en) 1999-08-25 2002-04-30 Flow International Corporation Apparatus and methods for z-axis control and collision detection and recovery for waterjet cutting systems
US6540586B2 (en) 1999-08-25 2003-04-01 Flow International Corporation Apparatus and methods for collision detection and recovery for waterjet cutting systems
AU2003213053A1 (en) * 2002-02-13 2003-09-04 Richel, Inc. Granular material recovery system
ATE374304T1 (de) 2003-10-29 2007-10-15 Shell Int Research Fluidstrahlbohrwerkzeug
CN103350401B (zh) * 2013-07-24 2015-10-28 益阳智方机电设备有限公司 数控水切割机床用起砂装置
AT517410B1 (de) * 2015-07-07 2018-05-15 Stm Stein Moser Gmbh Rückgewinnung von Schleifmittel von Abrasiv-Wasserstrahl-Schneidanlagen
ITUB20154174A1 (it) * 2015-10-06 2017-04-06 Nova S R L Apparecchiatura e metodo per il recupero di materiale di scarto in particolare per macchine di taglio a getto d'acqua
CZ2015961A3 (cs) * 2015-12-31 2017-02-15 PTV, spol. s r.o. Způsob recyklace abraziva z řezání vysokotlakým vodním paprskem z řezacího kalu a zařízení k provádění tohoto způsobu
CN106217266B (zh) * 2016-08-30 2018-11-13 盐城市丰特铸造机械有限公司 通过式抛丸处理系统
CN108312077B (zh) * 2018-04-13 2019-12-10 浙江海洋大学 喷砂回收装置
CN113457277A (zh) * 2021-06-08 2021-10-01 金川集团股份有限公司 一种浆液多功能分级净化系统
CN114633219B (zh) * 2022-02-21 2023-06-16 武汉大学 一种水射流钢轨打磨废液分离和磨料循环利用系统及方法

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Also Published As

Publication number Publication date
WO1998017439A3 (fr) 1998-08-20
WO1998017439A2 (fr) 1998-04-30
AU5306098A (en) 1998-05-15
DE19645142A1 (de) 1998-04-30

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