EP2867902B1 - Milling apparatus and millig process for ion exchange resins - Google Patents

Milling apparatus and millig process for ion exchange resins Download PDF

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Publication number
EP2867902B1
EP2867902B1 EP13759434.7A EP13759434A EP2867902B1 EP 2867902 B1 EP2867902 B1 EP 2867902B1 EP 13759434 A EP13759434 A EP 13759434A EP 2867902 B1 EP2867902 B1 EP 2867902B1
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EP
European Patent Office
Prior art keywords
exchange resin
ion
tank
grinding
milling
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EP13759434.7A
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German (de)
French (fr)
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EP2867902A1 (en
Inventor
Henning Fehrmann
Daniel SCHÜTZE
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Westinghouse Electric Germany GmbH
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Westinghouse Electric Germany GmbH
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/30—Processing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
    • B01F33/833—Devices with several tools rotating about different axis in the same receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
    • B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
    • B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/12—Processing by absorption; by adsorption; by ion-exchange
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/30—Processing
    • G21F9/301—Processing by fixation in stable solid media
    • G21F9/302—Processing by fixation in stable solid media in an inorganic matrix
    • G21F9/304—Cement or cement-like matrix

Definitions

  • the invention relates to a lonenSerharzzerklein mecanicsvoriques, comprising a tank for receiving an aqueous lonenSerharzsuspension, provided in the tank agitator, provided outside the tank grinding device and a pumping device for conveying the aqueous ion exchange resin suspension from the tank to the grinding device.
  • the patent document WO9409904 A1 relates to a process for the treatment and disposal of spent ion exchange resin, wherein said resin is first suspended in water substantially for the purpose of transport and thereafter dehydrated, dried, heat treated and mixed with water and liquid additives, whereupon the resulting mixture is poured into a Container is added, in which a binder and solid additives are added and mixed, whereupon said mixture of binder, dried and heat-treated resin and water is left alone
  • corundum disk mill By means of the corundum disk mill mentioned in the prior art, a fine grinding of the ion exchange resins in the suspension takes place by means of two corundum disks. These corundum disks are hard, brittle and usually have a porous structure.
  • the high porosity of the corundum discs causes a strong contamination of the discs with finely ground ion exchange resin, since the fine powder penetrates deep into the pores. This contamination is very difficult to remove. Since ion exchanger resins can have a high dose rate, this contamination poses an extreme hazard for the personnel.
  • the brittle properties of the corundum disk have the disadvantage that the discs break easily can and then an immediate replacement is required. Since such an exchange can only be done manually, a dose burden of the staff involved is inevitable.
  • the ion exchange resin is passed after passing through the corundum mill in a separate tank. This first comminution step with the corundum mill is necessary to make the ion exchange resin suspension pumpable and to allow a recirculation loop. Spherical, uncomminuted ion exchanger resins would sediment rapidly. In the circulation operation, the ion exchange resins are then further comminuted.
  • This circulation operation also has the disadvantage that it can lead to a mixing of already ground and unground ball resins, or there is a mixing of material which has already passed the mill several times, with that which has passed the corundum mill only in the first grinding step.
  • This mixing requires a long circulation operation to achieve the desired particle size distribution or to ensure that each grain has passed the mill at least once.
  • the said solution requires the use of two tanks, which on the one hand, the contaminated surface but also the space required is adversely affected.
  • limited space is a known limitation in nuclear installations.
  • an object of the invention to provide an improved comminution device for ion exchange resins, which is as compact as possible, in which as few components are contaminated and in which the lowest possible radiation exposure for the operating or maintenance personnel is given.
  • the object of the invention is also to provide a corresponding method.
  • the core idea of the invention is to divide the grinding process into two different grinding steps, which are carried out by two different grinding units.
  • a first milling step is provided, namely a pre-shredding operation in order to make the ion exchange resin suspension pumpable.
  • a second grinding step the actual grinding process then takes place to a fine-grained powder.
  • the inventive arrangement of the first grinding unit - the pre-crushing device - directly in the tank is advantageously allows the IonenSerharzsuspension can be pumped already made in the tank After a corresponding crushing process in a tank ion exchange resin suspension contained therein IonenSerharzparfiikel so far pre-crushed that the ion exchange resin suspension by means of the pumping device to the second grinding unit - the grinding device - can be supplied. Due to the pre-comminution of the ion-exchange resin particles that has already taken place, a single pass through the grinding device is sufficient to achieve the desired grinding result or the desired particle size distribution.
  • the inventive modular division of the crushing task in pre-crushing and grinding can thus account for a second tank advantageously. As a result, both the contaminated surface and the space requirement of the comminution device are advantageously minimized.
  • the pre-shredding in the tank eliminates the circulation operation with the mill and the associated uncertainties with regard to particle size distribution and sedimentation tendency.
  • the division of the comminution into two steps, pre-shredding and grinding ensures that each particle passes through the selection device just once.
  • the division of the comminution of the ion exchange resins on two grinding units allows flexible adaptation of the existing components of the comminution device to the respective comminution task. If no selection device is required to achieve the respective process objective, for example a minimization of the tendency to float, then only the pre-shredding device integrated into the tank can be used and the grinding device can be bypassed by a corresponding bypass.
  • the pre-comminution device is a disperser.
  • Dispersers operate on the rotor-stator principle, are suitable for the production of emulsions and suspensions and can be structurally particularly easy to integrate into the tank.
  • the rotor / stator ring used has a spacing of ⁇ 1 mm and is integrated in the tank.
  • a colloid mill is comminuted according to the rotor-stator principle. Between the toothed surfaces of the rotor and stator disks, thin-bodied to highly viscous products are comminuted, dispersed or homogenized in a narrow gap. The narrow gap and the high speed result in a high shear rate, which is responsible for the comminution effect.
  • a colloid mill suitable according to the invention is preferably characterized by the fact that the rotor or stator are conical. In the upper area are ideally provided fields and trains and in the lower area a rough grinding surface. Such a configuration leads to a particularly good grinding result for the ion exchange resins to be ground. Suitable materials for the grinding surface are, for example, metal carbides or ceramics.
  • the colloid mill has a rotor / stator ring with an adjustable gap spacing.
  • the shear rate can thus be adjusted continuously via the grinding gap and the properties of the milled ion exchange resin are thus influenced in an advantageous manner according to the respective process objective.
  • the adjustment of the desired particle size distribution at the outlet of the colloid mill takes place over the duration of the premilling in the tank, a corresponding adjustment of the grinding gap of the colloid mill, the solids content of the product, but also via the product pressure before the colloid mill which can be adjusted via the pump.
  • the stirring device in the tank is designed as an anchor agitator.
  • Anchor stirrers are particularly suitable for keeping a volume of a suspension in a storage tank in constant motion and thus preventing sedimentation.
  • the ion exchange resin grinding device has a dewatering device for adjusting the water content of the aqueous ion exchange resin suspension.
  • a dewatering device for adjusting the water content of the aqueous ion exchange resin suspension.
  • this optionally has a different water content.
  • the ion exchange resin grinder is designed so that a fixed water content is adjustable. In order to achieve this water content, the ion exchange resin suspension is first dehydrated and then added a defined amount of water again. Therefore, in the case where the ion exchange resin suspension has too low a water content, a water supply device is provided.
  • a drainage device has, for example, a suction pipe opening at the bottom of the tank with a filter.
  • the ion exchange resins can not pass this filter.
  • the water is drained during dewatering by means of a pump via the suction pipe and the associated filter and filled in a transport water tank.
  • a subsequent adjustment of the water content via metered return of the water in the tank. If the ion exchange resins contain too much water, the excess water is returned to the power plant system. Furthermore, it is possible to adjust the water content via water nozzles in the tank.
  • the grinding device is arranged below the tank.
  • the tank is designed for example as a stationary hollow cylinder with a funnel-like narrowing in its bottom area outlet opening. When the tank is raised, the grinder can be positioned under the tank to save space.
  • a tank according to the invention comprises, for example, a volume in the range from 500 l to 2000 l and at the start of the process according to the invention is to be filled with the desired amount of an ion exchanger resin suspension to be comminuted, preferably with an ion exchange resin suspension having a defined water / solids content.
  • This is followed by the pre-shredding process, which, depending on the process target, for example, takes 60 minutes. can take.
  • the ion exchange resin suspension is pumped through an outlet in the lower part of the tank and fed to the grinding device.
  • the optionally adjustable pressure which the associated pump builds up against the grinding device can optionally be used specifically to influence the grinding result.
  • the ion exchange resin suspension or the resin particles contained therein are completely comminuted.
  • the water content of the aqueous ion exchange resin suspension is adjusted before the pre-comminution by the pre-comminuting device.
  • a constant water content has an advantageous effect on the grinding result or the particle size distribution as well as the process stability.
  • the ground aqueous ion exchange resin suspension is subsequently dried. Then it is better to perform a final disposal, for example by high pressure compression.
  • a final disposal for example by high pressure compression.
  • FIG. 1 shows an exemplary ion exchange resin shredder 10 in a schematic view.
  • a tank 12 is filled with a IonenSerharzsus-pension 14, wherein the level level is indicated by line with the reference numeral 32.
  • the tank 12 is made of stainless steel and has a filling volume of, for example 800L or significantly more. In its upper part, it is designed as a hollow cylinder and tapers in its bottom area funnel-like to an outlet opening. But there are also embodiments without such a narrowing possible.
  • an inlet 30 for an ion exchange resin suspension is provided, which can be closed by a shut-off valve 28.
  • a plurality of inlet valves may be provided, so that the final suspension is formed only in the tank 12.
  • a stirring device 16 Centrally protrudes from above a stirring device 16 in the tank 12, which is driven by an external drive 18.
  • the stirring device 16 keeps the suspension 14 in a continuous motion by a rotary movement and prevents sedimentation of ion exchange resin particles.
  • a pre-shredding device 24 is integrated therein, in this case a disperser. Integrated in the context of this invention means that at least the components of the disperser, which must be in contact with the ion exchange resin suspension 14 for dispersion purposes, project at least partially into the tank. A complete arrangement of all components of the pre-shredding device 24 within the tank 12 is not required.
  • a shut-off valve 26 connected to the outlet of the tank is opened and the pre-shredded ion exchange resin suspension 14 is pumped in the direction of arrow 34 from a pumping device 22 to a grinder 20. Because of the successful pre-comminution, the ion exchange resin suspension 14 has become pumpable in the first place.
  • the grinding device 20 is in this case designed as a colloid mill and comminutes the pre-shredded resin particles of the ion exchange resin suspension 14 into a fine powder depending on the boundary parameters such as, for example, grinding gap or pump pressure. Via a drain 36, the milled ion exchange resin suspension 14 is then fed to its further use.
  • a bypass to the grinding device proceed, for example, if according to the respective process specifications a pre-crushing of the resin particles of the ion exchange resin suspension 14 evades.
  • a filter 38 and a suction pipe 40 of a dewatering device is further shown, by means of which the ion exchange resin suspension 14 located in the tank 12 can be dehydrated.
  • the uncut ion exchange resin particles are approximately spherical and can not pass through the filter 38.
  • a suction by means of a pump 42 thus water from the ion exchange resin suspension is pumped into a transport water tank 44 until the Is dewatered ion exchange resin suspension. Subsequently, the tank 12 is again fed via a return 46 so much water until the desired water content is reached.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)

Description

Die Erfindung betrifft eine lonenaustauscherharzzerkleinerungsvorrichtung, umfassend einen Tank zur Aufnahme einer wässrigen lonenaustauscherharzsuspension, eine im Tank vorgesehene Rührvorrichtung, eine außerhalb des Tanks vorgesehene Mahlvorrichtung sowie eine Pumpvorrichtung zum Fördern der wässrigen Ionenaustauscherharzsuspension vom Tank zur Mahlvorrichtung.The invention relates to a lonenaustauscherharzzerkleinerungsvorrichtung, comprising a tank for receiving an aqueous lonenaustauscherharzsuspension, provided in the tank agitator, provided outside the tank grinding device and a pumping device for conveying the aqueous ion exchange resin suspension from the tank to the grinding device.

Es ist bekannt, dass in konventionellen Kraftwerken und kerntechnischen Anlagen und Kraftwerken zur Reinigung von Wasser bzw. Abwasser Ionenaustauschererharze eingesetzt werden. Insbesondere im kerntechnischen Bereich müssen die radioaktiv belasteten lonenaustauschererharze aufwändig behandelt und entsorgt werden. Hierbei werden oft Verfahren wie Entwässerung, Trocknung oder Verfestigung in einer Zementmatrix eingesetzt. Bei der Anwendung dieser Verfahren können die kugelförmigen lonenaustauscherharze entweder direkt verarbeitet werden oder sie werden zuvor aufgemahlen. Hierzu kommen Mühlen zum Einsatz wie z.B. Korundscheibenmühlen, Dabei werden die lonenaustauschererharze mit Wasser suspendiert und in einem Umwälzkreislauf über die Mühle geführt, um das gewünschte Mahlergebnis zu erreichen. Eine Aufmahlung von lonenaustauschererharzen kann erforderlich sein, um in anschließenden Prozessen bessere Ergebnisse zu erreichen, wie z.B.:

  • die verringerte Aufschwimmungsneigung von gemahlenen Harzen beim Zementieren,
  • der verbesserte Wärmeübergang durch eine vergrößerte Oberfläche bei der Trocknung und somit kürzere Trocknungszeiten,
  • verbesserte Komprimierungseigenschaften beim Hochdruckverpressen.
It is known that ion exchange resins are used in conventional power plants and nuclear facilities and power plants for the purification of water or wastewater. Especially in the nuclear field, the radioactively loaded ion exchanger resins have to be treated and disposed of in a complicated manner. In this case, methods such as dewatering, drying or solidification in a cement matrix are often used. When using these methods, the spherical ion exchange resins can either be processed directly or they are previously ground. For this purpose, mills are used, such as corundum disk mills, the ion exchanger resins are suspended with water and passed through the mill in a circulation cycle to achieve the desired grinding result. Milling of ion exchanger resins may be required to achieve better results in subsequent processes, such as:
  • the reduced tendency to float of ground resins when cementing,
  • the improved heat transfer due to an increased surface during drying and thus shorter drying times,
  • improved compression properties during high pressure compression.

In der Patentschrift EP0963588 B1 ist eine Vorrichtung beziehungsweise ein Verfahren offenbart, bei dem eine in einem ersten Behälter befindliche lonenaustauscherharzsuspension einer außerhalb liegenden Korundscheibenmühle zugeführt wird und nach dem Mahlvorgang in einem zweiten Behälter gesammelt wird, von wo die lonenaustauscherharzsuspension im Umlaufbetrieb wieder der Korundscheibenmühle zugeführt wird.In the patent EP0963588 B1 a device or a method is disclosed in which an ion exchange resin suspension located in a first container is fed to an outer corundum disc mill and collected after the grinding process in a second container, from where the ion exchange resin suspension is recirculated to the corundum disc mill.

Das Patentdokument WO9409904 A1 betrifft ein Verfahren zur Behandlung und Entsorgung von verbrauchtem lonenaustauscherharz, wobei das genannte Harz zunächst in Wasser im Wesentlichen zum Zwecke des Transportes in Suspension gebracht wird und danach entwässert, getrocknet, wärmebehandelt und mit Wasser und flüssigen Zusätzen gemischt wird, worauf die resultierende Mischung in einen Behälter gefüllt wird, in welchem ein Bindemittel und feste Zusätze zugegeben und untergemischt werden, worauf die genannte Mischung aus Bindemittel, getrocknetem und wärmebehandeltem Harz und Wasser in Ruhe gelassen wirdThe patent document WO9409904 A1 relates to a process for the treatment and disposal of spent ion exchange resin, wherein said resin is first suspended in water substantially for the purpose of transport and thereafter dehydrated, dried, heat treated and mixed with water and liquid additives, whereupon the resulting mixture is poured into a Container is added, in which a binder and solid additives are added and mixed, whereupon said mixture of binder, dried and heat-treated resin and water is left alone

Durch die im Stand der Technik genannte Korundscheibenmühle erfolgt eine feine Aufmahlung der in der Suspension befindlichen lonenaustauschererharze mittels zweier Korundscheiben. Diese Korundscheiben sind hart, spröde und weisen meist eine poröse Struktur auf.By means of the corundum disk mill mentioned in the prior art, a fine grinding of the ion exchange resins in the suspension takes place by means of two corundum disks. These corundum disks are hard, brittle and usually have a porous structure.

Insbesondere die hohe Porosität der Korundscheiben bedingt eine starke Kontamination der Scheiben mit fein gemahlenem lonenaustauscherharz, da das feine Pulver tief in die Poren eindringt. Diese Kontamination ist nur sehr schwer zu entfernen. Da lonenaustauschererharze eine hohe Dosisleistung aufweisen können, stellt diese Kontamination eine extreme Gefährdung für das Personals dar. Die spröden Eigenschaften der Korundscheibe haben den Nachteil, dass die Scheiben leicht brechen können und dann ein sofortiger Austausch erforderlich wird. Da ein solcher Austausch nur manuell vorgenommen werden kann, ist eine Dosisbelastung des beteiligten Personals unvermeidlich.In particular, the high porosity of the corundum discs causes a strong contamination of the discs with finely ground ion exchange resin, since the fine powder penetrates deep into the pores. This contamination is very difficult to remove. Since ion exchanger resins can have a high dose rate, this contamination poses an extreme hazard for the personnel. The brittle properties of the corundum disk have the disadvantage that the discs break easily can and then an immediate replacement is required. Since such an exchange can only be done manually, a dose burden of the staff involved is inevitable.

Bei dem im Stand der Technik genannten Verfahren wird das lonenaustauscherharz nach Durchlauf durch die Korundmühle in einen separaten Tank geführt. Dieser erste Zerkleinerungschritt mit der Korundmühle ist notwendig, um die lonenaustauscherharzsuspension pumpbar zu machen und einen Umwälzkreislauf zu ermöglichen. Kugelförmige, unzerkleinerte lonenaustauschererharze würden schnell sedimentieren. Im Umwälzbetrieb werden die lonenaustauscherharze dann weiter zerkleinert.In the process mentioned in the prior art, the ion exchange resin is passed after passing through the corundum mill in a separate tank. This first comminution step with the corundum mill is necessary to make the ion exchange resin suspension pumpable and to allow a recirculation loop. Spherical, uncomminuted ion exchanger resins would sediment rapidly. In the circulation operation, the ion exchange resins are then further comminuted.

Dieser Umwälzbetrieb hat weiterhin den Nachteil, dass es zu einer Vermischung von bereits gemahlenen und ungemahlenen Kugelharzen kommen kann, bzw. es erfolgt eine Vermischung von Material welches schon mehrfach die Mühle passiert hat, mit demjenigen, welches die Korundmühle nur im ersten Mahlschritt passiert hat. Diese Vermischung macht einen langen Umwälzbetrieb erforderlich, um die gewünschte Korngrößenverteilung zu erreichen bzw. um sicherzustellen, dass jedes Korn die Mühle mindestens einmal passiert hat. Fernerhin bedingt die genannte Lösung die Verwendung zweier Tanks, wodurch einerseits die kontaminierte Oberfläche aber auch der Platzbedarf nachteilig erhöht ist. Geringe Platzverhältnisse sind jedoch in kerntechnischen Anlagen eine bekannte Limitierung.This circulation operation also has the disadvantage that it can lead to a mixing of already ground and unground ball resins, or there is a mixing of material which has already passed the mill several times, with that which has passed the corundum mill only in the first grinding step. This mixing requires a long circulation operation to achieve the desired particle size distribution or to ensure that each grain has passed the mill at least once. Furthermore, the said solution requires the use of two tanks, which on the one hand, the contaminated surface but also the space required is adversely affected. However, limited space is a known limitation in nuclear installations.

Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine verbesserte Zerkleinerungsvorrichtung für lonenaustauscherharze zur Verfügung zu stellen, welche möglichst kompakt ist, bei welcher möglichst wenige Komponenten kontaminiert werden und bei welcher eine möglichst geringe Strahlenbelastung für das Bedien- beziehungsweise Wartungspersonal gegeben ist. Aufgabe der Erfindung ist es auch, ein entsprechendes Verfahren anzugeben.Based on this prior art, it is an object of the invention to provide an improved comminution device for ion exchange resins, which is as compact as possible, in which as few components are contaminated and in which the lowest possible radiation exposure for the operating or maintenance personnel is given. The object of the invention is also to provide a corresponding method.

Diese Aufgabe wird gelöst durch eine Ionenaustauscherharzzerkleinerungsvorrichtung der eingangs genannten Art. Diese ist dadurch gekennzeichnet, dass im Tank eine Vorzerkleinerungsvorrichtung vorgesehen ist.This object is achieved by a Ionenaustauscherharzzerkleinerungsvorrichtung of the type mentioned. This is characterized in that a Vorzerkleinerungsvorrichtung is provided in the tank.

Die Kernidee der Erfindung besteht darin, den Mahlvorgang in zwei verschiedene Mahlschritte aufzuteilen, welche durch zwei verschiedene Mahlaggregate durchgeführt werden. So ist erfindungsgemäß ein erster Mahlschritt vorgesehen, nämlich ein Vorzerkleinerungsvorgang, um die lonenaustauscherharzsuspension pumpbar zu machen. In einem zweiten Mahlschritt erfolgt dann der eigentliche Mahlvorgang zu einem feinkörnige Pulver.The core idea of the invention is to divide the grinding process into two different grinding steps, which are carried out by two different grinding units. Thus, according to the invention, a first milling step is provided, namely a pre-shredding operation in order to make the ion exchange resin suspension pumpable. In a second grinding step, the actual grinding process then takes place to a fine-grained powder.

Durch die erfindungsgemäße Anordnung des ersten Mahlaggregates - der Vorzerkleinerungsvorrichtung - direkt im Tank ist in vorteilhafter Weise ermöglicht, dass die lonenaustauscherharzsuspension bereits im Tank pumpbar gemacht werden kann Nach einem entsprechenden Zerkleinerungsvorgang einer im Tank befindlichen Ionenaustauscherharzsuspension sind die darin enthaltenen Ionenaustauscherharzparfiikel soweit vorzerkleinert, dass die lonenaustauscherharzsuspension mittels der Pumpvorrichtung dem zweiten Mahlaggregat - der Mahlvorrichtung - zugeführt werden kann. Aufgrund der bereits erfolgten Vorzerkleinerung der Ionenaustauscherharzpartikel ist im Weiteren ein einziger Durchlauf durch die Mahlvorrichtung ausreichend, um das gewünschte Mahlergebnis beziehungsweise die gewünschte Kornverteilung zu erreichen. Durch die erfindungsgemäße modulare Aufteilung der Zerkleinerungsaufgabe in Vorzerkleinerung und Mahlung kann damit in vorteilhafter Weise ein zweiter Tank entfallen. Dadurch wird sowohl die kontaminierte Oberfläche als auch der Platzbedarf der Zerkleinerungsvorrichtung vorteilhaft minimiert.The inventive arrangement of the first grinding unit - the pre-crushing device - directly in the tank is advantageously allows the Ionenaustauscherharzsuspension can be pumped already made in the tank After a corresponding crushing process in a tank ion exchange resin suspension contained therein Ionenaustauscherharzparfiikel so far pre-crushed that the ion exchange resin suspension by means of the pumping device to the second grinding unit - the grinding device - can be supplied. Due to the pre-comminution of the ion-exchange resin particles that has already taken place, a single pass through the grinding device is sufficient to achieve the desired grinding result or the desired particle size distribution. The inventive modular division of the crushing task in pre-crushing and grinding can thus account for a second tank advantageously. As a result, both the contaminated surface and the space requirement of the comminution device are advantageously minimized.

Des Weiteren entfallen durch die Vorzerkleinerung im Tank der Umwälzbetrieb mit der Mühle und die damit verbundenen Unsicherheiten hinsichtlich Korngrößenverteilung und Sedimenationsneigung, Die Aufteilung der Zerkleinerung in zwei Schritte, Vorzerkleinerung und Mahlung stellt sicher, dass jeder Partikel genau einmal durch die Wahlvorrichtung gelangt. Darüber hinaus ermöglicht die Aufteilung der Zerkleinerung der lonenaustauscherharze auf zwei Mahlaggregate eine flexible Anpassung der vorhandenen Komponenten der Zerkleinerungsvorrichtung auf die jeweilige Zerkleinerungsaufgabe. Ist zum Erreichen des jeweiligen Prozesszieles, beispielsweise eine Minimierung der Floatationneigung, keine Wahlvorrichtung erforderlich, so kann auch nur die in den Tank integrierte Vorzerkleinerungsvorrichtung genutzt werden und die Mahlvorrichtung durch einen entsprechenden Bypass umgangen werden.Furthermore, the pre-shredding in the tank eliminates the circulation operation with the mill and the associated uncertainties with regard to particle size distribution and sedimentation tendency. The division of the comminution into two steps, pre-shredding and grinding ensures that each particle passes through the selection device just once. In addition, the division of the comminution of the ion exchange resins on two grinding units allows flexible adaptation of the existing components of the comminution device to the respective comminution task. If no selection device is required to achieve the respective process objective, for example a minimization of the tendency to float, then only the pre-shredding device integrated into the tank can be used and the grinding device can be bypassed by a corresponding bypass.

Mit der erfindungsgemäßen lonenaustauscherharzzerkleinerungsvorrichtung werden folgende Vorteile erzielt:

  • Verringerung der Dosisleistung für das Personal bei Eingriffen (wie z.B. Wartung oder Fehlerbehebung) und somit Verbesserung des Strahlenschutzes für das Personal,
  • Verringerung der ionisierenden Strahlung, die von den Mahlvverkzeug ausgeht,
  • geringere Ausfallwahrscheinlichkeit,
  • Verzicht auf zeitintensiven Umwälzbetrieb,
  • geringerer Platzbedarf,
  • flexible räumliche Aufstellung durch Integration der Vorzerkleinerung in den Tank,
  • flexible Anpassung der Vorrichtungskomponenten an die prozesstechnischen Erfordernisse.
The following advantages are achieved with the ion exchange resin shredder according to the invention:
  • Reducing the dose rate to the staff during procedures (such as maintenance or troubleshooting) and thus improving radiation protection for the staff,
  • Reduction of ionizing radiation emanating from the grinding mills
  • lower probability of failure,
  • Waiver of time-consuming circulation operation,
  • less space required,
  • flexible spatial positioning through integration of pre-shredding in the tank,
  • flexible adaptation of the device components to the process engineering requirements.

Gemäß einer besonders bevorzugten Ausgestaltungsvariante der Erfindung ist die Vorzerkleinerungsvorrichtung ein Dispergierer. Dispergierer arbeiten nach dem Rotor-Stator-Prinzip, sind geeignet für die Herstellung von Emulsionen und Suspensionen und lassen sich konstruktiv besonders einfach in den Tank integrieren. In bevorzugter Weise weist der verwendete Rotor-/Statorkranz einen Abstand von ≤ 1 mm auf und ist in den Tank integriert.According to a particularly preferred embodiment variant of the invention, the pre-comminution device is a disperser. Dispersers operate on the rotor-stator principle, are suitable for the production of emulsions and suspensions and can be structurally particularly easy to integrate into the tank. Preferably, the rotor / stator ring used has a spacing of ≤ 1 mm and is integrated in the tank.

Entsprechend einer weiterhin bevorzugten Ausgestaltung der erfindungsgemäßen lonenaustauscherharzzerkleinerungsvorrichtung ist die Mahlvorrichtung eine Kolloidmühle- Eine Kolloidmühle zerkleinert nach dem Rotor-Stator-Prinzip Zwischen den verzahnten Flächen der Rotor- und Statorscheibe werden in einem engen Spalt dünnflüssige bis hochviskose Produkte zerkleinert, dispergiert oder homogenisiert. Durch den engen Spalt und die hohe Drehzahl entsteht ein hohes Schergefälle, das für die Zerkleinerungswirkung verantwortlich ist. Eine erfingdungsgemäß geeignete Kolloidmühle zeichnet sich bevorzugter Weise dadurch aus, dass der Rotor bzw. Stator konisch ausgeführt sind. Im oberen Bereich sind in idealer Weise Felder und Züge vorgesehen und im unteren Bereich eine raue Mahlfläche. Eine derartige Ausgestaltung führt zu einem besonders guten Mahlergebnis für die zu mahlenden lonenaustauscherharze. Als Materialien für die Mahlfläche kommen beispielsweise Metallkarbide oder Keramiken in Betracht.A colloid mill is comminuted according to the rotor-stator principle. Between the toothed surfaces of the rotor and stator disks, thin-bodied to highly viscous products are comminuted, dispersed or homogenized in a narrow gap. The narrow gap and the high speed result in a high shear rate, which is responsible for the comminution effect. A colloid mill suitable according to the invention is preferably characterized by the fact that the rotor or stator are conical. In the upper area are ideally provided fields and trains and in the lower area a rough grinding surface. Such a configuration leads to a particularly good grinding result for the ion exchange resins to be ground. Suitable materials for the grinding surface are, for example, metal carbides or ceramics.

Einer weiteren Variante der Erfindung folgend weist die Kolloidmühle einen Rotor/Statorkranz mit einem verstellbaren Spaltabstand auf. Das Schergefälle kann somit über den Mahlspalt stufenlos eingestellt werden und die Eigenschaften des gemahlenen lonenaustauscherharzes werden damit in vorteilhafter Weise entsprechend dem jeweiligen Prozessziel beeinflusst. Die Einstellung der gewünschten Komverteilung des Produkts am Austritt der Kolloidmühle erfolgt über die Dauer der Vormahlung im Tank, eine entsprechende Einstellung des Mahlspalts der Kolloidmühle, dem Feststoffgehalt des Produktes, aber auch über den über die Pumpe einstellbaren Produktdruck vor der Kolloidmühle. Darüber hinaus besteht die Möglichkeit die Mühle bedarfsweise über einen Bypass zu umfahren, um eine breitere Kornverteilung im Endprodukt zu erreichen, indem das gemahlene Produkt mit dem vorzerkleinerten Produkt vermischt wird.According to a further variant of the invention, the colloid mill has a rotor / stator ring with an adjustable gap spacing. The shear rate can thus be adjusted continuously via the grinding gap and the properties of the milled ion exchange resin are thus influenced in an advantageous manner according to the respective process objective. The adjustment of the desired particle size distribution at the outlet of the colloid mill takes place over the duration of the premilling in the tank, a corresponding adjustment of the grinding gap of the colloid mill, the solids content of the product, but also via the product pressure before the colloid mill which can be adjusted via the pump. In addition, it is possible to bypass the mill as needed via a bypass to a wider grain distribution in the To reach final product by mixing the ground product with the pre-shredded product.

Gemäß einer weiteren Ausführungsvariante der erfindungsgemäßen lonenaustauscherharzzerkleinerungsvorrichtung ist die Rührvorrichtung im Tank als Ankerrührer ausgeführt. Ankerrührer sind besonders geeignet, ein in einem Vorratstank befindliches Volumen einer Suspension in steter Bewegung zu halten und somit eine Sedimentation zu verhindern.According to a further embodiment of the ion exchange resin shredding device according to the invention, the stirring device in the tank is designed as an anchor agitator. Anchor stirrers are particularly suitable for keeping a volume of a suspension in a storage tank in constant motion and thus preventing sedimentation.

Entsprechend einer weiteren erfindungsgemäßen Variante weist die Ionenaustauscherharzzerkleinerungsvorrichtung eine Entwässerungsvorrichtung zur Anpassung des Wassergehaltes der wässrigen lonenaustauscherharzsuspension auf. Je nach Herkunft des zu zerkleinernden und zu entsorgenden lonenaustauscherharzes beziehungsweise der lonenaustauscherharzsuspension weist diese gegebenenfalls einen unterschiedlichen Wassergehalt auf. Um aber ein optimales Mahlergebnis und eine hohe Prozesseffizienz zu erreichen ist es typischerweise jedoch erforderlich, eine lonenaustauscherharzsuspension mit einem festen Wasseranteil vorzuhalten. Daher ist die lonenaustauscherharzzerkleinerungsvorrichtung so ausgelegt, dass ein fester Wassergehalt einstellbar ist. Um diesen Wassergehalt zu erreichen wird die Ionenaustauscherharzsuspension zunächst entwässert und anschließend eine definierte Menge an Wasser erneut hinzugefügt. Daher ist für den Fall, dass die Ionenaustauscherharzsuspension einen zu geringen Wassergehalt aufweist, eine Zuführungsvorrichtung für Wasser vorgesehen.According to a further variant of the invention, the ion exchange resin grinding device has a dewatering device for adjusting the water content of the aqueous ion exchange resin suspension. Depending on the origin of the ion exchange resin or the ion exchange resin suspension to be comminuted and disposed of, this optionally has a different water content. However, in order to achieve an optimum grinding result and high process efficiency, it is typically necessary to have an ion exchange resin suspension with a fixed water content. Therefore, the ion exchange resin grinder is designed so that a fixed water content is adjustable. In order to achieve this water content, the ion exchange resin suspension is first dehydrated and then added a defined amount of water again. Therefore, in the case where the ion exchange resin suspension has too low a water content, a water supply device is provided.

Eine Entwässerungsvorrichtung weist beispielsweise ein am Boden des Tanks mündendes Saugrohr mit einem Filter auf. Solange die lonenaustauscherharze noch nicht zerkleinert sondern kugelförmig sind, können die lonenaustauscherharze diesen Filter nicht passieren. Das Wasser wird beim Entwässern mittels einer Pumpe über das Saugrohr und den zugehörigen Filter abgepumpt und in einen Transportwassertank gefüllt. Eine anschließende Einstellung des Wassergehaltes erfolgt über dosierte Rückführung des Wassers in den Tank. Sollten die lonenaustauscherharze zu viel Wasser enthalten, wird das überschüssige Wasser zurück ans Kraftwerksystem gegeben. Des Weiteren ist es möglich, den Wassergehalt über Wasserdüsen im Tank einzustellen.A drainage device has, for example, a suction pipe opening at the bottom of the tank with a filter. As long as the ion exchange resins are not comminuted but spherical, the ion exchange resins can not pass this filter. The water is drained during dewatering by means of a pump via the suction pipe and the associated filter and filled in a transport water tank. A subsequent adjustment of the water content via metered return of the water in the tank. If the ion exchange resins contain too much water, the excess water is returned to the power plant system. Furthermore, it is possible to adjust the water content via water nozzles in the tank.

Gemäß einer ebenfalls bevorzugten Ausgestaltungsvariante der lonenaustauscherharzzerkleinerungsvorrichtung ist die Mahlvorrichtung unterhalb des Tanks angeordnet. Der Tank ist beispielsweise als stehender Hohlzylinder mit einer in seinem Bodenbereich sich trichterähnlich verengenden Auslassöffnung ausgeführt. Bei einer Aufständerung des Tanks lässt sich die Mahlvorrichtung besonders platzsparend unter dem Tank positionieren,According to a likewise preferred embodiment variant of the ion exchange resin grinding device, the grinding device is arranged below the tank. The tank is designed for example as a stationary hollow cylinder with a funnel-like narrowing in its bottom area outlet opening. When the tank is raised, the grinder can be positioned under the tank to save space.

Die erfindungsgemäße Aufgabe wird auch gelöst durch ein Ionenaustauscherharzzerkleinerungsverfahren mit einer erfindungsgemäßen lonenaustauscherharzzerkleinerungsvorrichtung und umfasst folgende Schritt;

  • Befüllung des Tanks mit einer wässrigen lonenaustauscherharzsuspension,
  • Vorzerkleinerung der Harzpartikel der lonenaustauscherharzsuspension mittels der Vorzerkleinerungsvorrichtung,
  • sukzessives Entleeren des Tanks und Fördern der lonenaustauscherharzsuspension zur Mahlvorrichtung,
  • Mahlen der Harzpartikel der sukzessiv zugeförderten lonenaustauscherharzsuspension in der Mahlvorrichtung.
The object of the invention is also achieved by an ion exchange resin grinding process with an ion exchange resin grinding device according to the invention and comprises the following step;
  • Filling the tank with an aqueous ion exchange resin suspension,
  • Pre-comminution of the resin particles of the ion exchange resin suspension by means of the pre-comminuting device,
  • successively emptying the tank and conveying the ion exchange resin suspension to the grinding device,
  • Grinding the resin particles of the successively supplied ion exchange resin suspension in the milling apparatus.

Ein erfindungsgemäßer Tank umfasst beispielsweise ein Volumen im Bereich von 500I bis 20001 auf und ist zu Beginn des erfindungsgemäßen Verfahrens mit der gewünschten Menge einer zu zerkleinernden lonenaustauscherharzsuspension zu befüllen, bevorzugter Weise mit einer lonenaustauscherharzsuspension mit definiertem Wasser- / Feststoffgehalt. Anschließend erfolgt der Vorzerkleinerungsvorgang, welcher je nach Prozessziel beispielsweise 60min. in Anspruch nehmen kann. Nach Vorzerkleinerung der in der Suspension befindlichen Ionenaustauscherharzpartikel wird die Ionenaustauscherharzsuspension über einen Auslass im unteren Bereich des Tanks abgepumpt und der Mahlvorrichtung zugeführt- Der bedarfsweise einstellbare Druck, welchen die zugehörige Pumpe gegenüber der Mahlvorrichtung aufbaut, kann dabei gegebenenfalls gezielt zur Beeinflussung des Mahlergebnisses verwendet werden. Nach einmaligem Durchlaufen der Mahlvorrichtung sind die Ionenaustauscherharzsuspension beziehungsweise die darin enthaltenen Harzpartikel fertig zerkleinert. Die Vorteile dieses Verfahrens entsprechen den zuvor genannten der erfindungsgemäßen lonenaustauscherharzzerkleinerungsvorrichtung.A tank according to the invention comprises, for example, a volume in the range from 500 l to 2000 l and at the start of the process according to the invention is to be filled with the desired amount of an ion exchanger resin suspension to be comminuted, preferably with an ion exchange resin suspension having a defined water / solids content. This is followed by the pre-shredding process, which, depending on the process target, for example, takes 60 minutes. can take. After pre-comminution of the ion exchange resin particles in the suspension, the ion exchange resin suspension is pumped through an outlet in the lower part of the tank and fed to the grinding device. The optionally adjustable pressure which the associated pump builds up against the grinding device can optionally be used specifically to influence the grinding result. After passing once through the grinding apparatus, the ion exchange resin suspension or the resin particles contained therein are completely comminuted. The advantages of this method correspond to the aforementioned ion exchange resin grinding apparatus according to the invention.

Gemäß einer weiteren Verfahrensvariante wird vor der Vorzerkleinerung durch die Vorzerkleinerungsvorrichtung der Wassergehalt der wässrigen Ionenaustauscher-harzsuspension angepasst. Ein konstanter Wassergehalt wirkt sich vorteilhaft auf das Mahlergebnis beziehungsweise die Kornverteilung sowie die Prozessstabilität aus.According to a further variant of the method, the water content of the aqueous ion exchange resin suspension is adjusted before the pre-comminution by the pre-comminuting device. A constant water content has an advantageous effect on the grinding result or the particle size distribution as well as the process stability.

Entsprechend einer weiteren Variante des erfindungsgemäßen Ionenaustauscherharzzerkleinerungsverfahrens wird die gemahlene wässrige Ionenaustauscherharzsuspension anschließend getrocknet. Dann lässt sie sich besser einer abschließenden Entsorgung zuführen, beispielsweise durch Hochdruckverpressen. Diese dadurch entstandenen Presslinge sind besonders volumenoptimiert, können optional mit Zement vergossen und anschließend einer Endlagerung zugeführt werden.According to a further variant of the ion exchange resin comminution process according to the invention, the ground aqueous ion exchange resin suspension is subsequently dried. Then it is better to perform a final disposal, for example by high pressure compression. These resulting compacts are particularly volume-optimized, can optionally be cast with cement and then a final disposal.

Weitere vorteilhafter Ausgestaltungsmöglichkeiten sind den weiteren abhängigen Ansprüchen zu entnehmen.Further advantageous embodiment possibilities can be found in the further dependent claims.

Anhand der in der Zeichnung dargestellten Ausführungsbeispiele sollen die Erfindung, weitere Ausführungsformen und weitere Vorteile näher beschrieben werden.Reference to the embodiments illustrated in the drawings, the invention, further embodiments and other advantages will be described in more detail.

Es zeigt

Fig. 1
eine exemplarische lonenaustauscherharzzerkleinerungsvorrichtung.
It shows
Fig. 1
an exemplary ion exchange resin grinder.

Fig. 1 zeigt eine exemplarische lonenaustauscherharzzerkleinerungsvorrichtung 10 in einer schematischen Ansicht. Ein Tank 12 ist mit einer Ionenaustauscherharzsus-pension 14 gefüllt, wobei das Füllstandsniveau mit Linie mit der Bezugsziffer 32 angedeutet ist. Der Tank 12 ist aus Edelstahl gefertigt und weist ein Füllvolumen von beispielsweise 800L oder auch deutlich mehr auf. In seinem oberen Bereich ist er hohlzylindrisch ausgeführt und verjüngt sich in seinem Bodenbereich trichterähnlich zu einer Auslassöffnung. Es sind aber auch Ausführungsformen ohne eine derartige Verengung möglich. In seinem oberen Bereich ist ein Zulauf 30 für eine lonenaustauscherharzsuspension vorgesehen, welcher über ein Absperrventil 28 verschließbar ist. Selbstverständlich können auch mehrere Zulaufventile vorgesehen sein, so dass die endgültige Suspension erst im Tank 12 gebildet wird. Fig. 1 shows an exemplary ion exchange resin shredder 10 in a schematic view. A tank 12 is filled with a Ionenaustauscherharzsus-pension 14, wherein the level level is indicated by line with the reference numeral 32. The tank 12 is made of stainless steel and has a filling volume of, for example 800L or significantly more. In its upper part, it is designed as a hollow cylinder and tapers in its bottom area funnel-like to an outlet opening. But there are also embodiments without such a narrowing possible. In its upper area, an inlet 30 for an ion exchange resin suspension is provided, which can be closed by a shut-off valve 28. Of course, a plurality of inlet valves may be provided, so that the final suspension is formed only in the tank 12.

Von oben ragt mittig eine Rührvorrichtung 16 in den Tank 12, welche durch einen außen liegenden Antrieb 18 angetrieben ist. Die Rührvorrichtung 16 hält durch eine Drehbewegung die Suspension 14 in einer steten Bewegung und verhindert ein Sedimentieren von lonenaustauscherharzpartikeln. Im unteren Bereich des Tanks 12 ist eine Vorzerkleinerungsvorrichtung 24 in diesen integriert, in diesem Fall ein Dispergierer. Integriert bedeutet im Rahmen dieser Erfindung, dass zumindest die Komponenten des Dispergierers, welche zu Dispersionszwecken in Kontakt mit der Ionenaustauscherharzsuspension 14 stehen müssen, zumindest teilweise in den Tank hineinragen. Eine vollständige Anordnung aller Komponenten der Vorzerkleinerungsvorrichtung 24 innerhalb des Tanks 12 ist nicht erforderlich.Centrally protrudes from above a stirring device 16 in the tank 12, which is driven by an external drive 18. The stirring device 16 keeps the suspension 14 in a continuous motion by a rotary movement and prevents sedimentation of ion exchange resin particles. In the lower part of the tank 12, a pre-shredding device 24 is integrated therein, in this case a disperser. Integrated in the context of this invention means that at least the components of the disperser, which must be in contact with the ion exchange resin suspension 14 for dispersion purposes, project at least partially into the tank. A complete arrangement of all components of the pre-shredding device 24 within the tank 12 is not required.

Nach Abschluss eines Vorzerkleinerungsvorgangs wird ein mit dem Auslass des Tanks verbundenes Absperrventil 26 geöffnet und die vorzerkleinerte Ionenaustauscherharzsuspension 14 wird in Richtung des Pfeils 34 von einer Pumpvorrichtung 22 zu einer Mahlvorrichtung 20 gepumpt. Durch die erfolge Vorzerkleinerung ist die lonenaustauscherharzsuspension 14 nämlich überhaupt erst pumpbar geworden.Upon completion of a pre-shredding operation, a shut-off valve 26 connected to the outlet of the tank is opened and the pre-shredded ion exchange resin suspension 14 is pumped in the direction of arrow 34 from a pumping device 22 to a grinder 20. Because of the successful pre-comminution, the ion exchange resin suspension 14 has become pumpable in the first place.

Die Mahlvorrichtung 20 ist in diesem Fall als Kolloidmühle ausgeführt und zerkleinert in Abhängigkeit von den Randparametern wie beispielsweise Mahlspalt oder Pumpenvordruck die vorzerkleinerten Harzpartikel der lonenaustauscherharzsuspension 14 zu einem feinen Pulver. Über einen Ablauf 36 wird die gemahlene Ionenaustauscherharzsuspension 14 dann ihrer weiteren Verwendung zugeführt.The grinding device 20 is in this case designed as a colloid mill and comminutes the pre-shredded resin particles of the ion exchange resin suspension 14 into a fine powder depending on the boundary parameters such as, for example, grinding gap or pump pressure. Via a drain 36, the milled ion exchange resin suspension 14 is then fed to its further use.

Bedarfsweise ist aber auch ein Bypass zur Mahlvorrichtung vorzugehen, beispielsweise wenn entsprechend den jeweiligen Prozessvorgaben eine Vorzerkleinerung der Harzpartikel der lonenaustauscherharzsuspension 14 ausweicht.If necessary, however, a bypass to the grinding device proceed, for example, if according to the respective process specifications a pre-crushing of the resin particles of the ion exchange resin suspension 14 evades.

Im unteren Tankbereich ist weiterhin ein Filter 38 und ein Saugrohr 40 einer Entwässerungsvorrichtung gezeigt, mittels welcher die im Tank 12 befindliche Ionenaustauscherharzsuspension 14 entwässert werden kann. Die unzerkleinerten Ionenaustauscherharzpartikel sind annähernd kugelförmig und können den Filter 38 nicht passieren. Bei einem Absaugvorgang mittels einer Pumpe 42 wird somit Wasser aus der lonenaustauscherharzsuspension in einen Transportwassertank 44 gepumpt, bis die lonenaustauscherharzsuspension entwässert ist. Anschließend wird über eine Rückführung 46 dem Tank 12 wieder so viel Wasser zugeführt, bis der gewünschte Wassergehalt erreicht ist.In the lower tank area, a filter 38 and a suction pipe 40 of a dewatering device is further shown, by means of which the ion exchange resin suspension 14 located in the tank 12 can be dehydrated. The uncut ion exchange resin particles are approximately spherical and can not pass through the filter 38. In a suction by means of a pump 42 thus water from the ion exchange resin suspension is pumped into a transport water tank 44 until the Is dewatered ion exchange resin suspension. Subsequently, the tank 12 is again fed via a return 46 so much water until the desired water content is reached.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
exemplarische lonenaustauscherharzzerkleinerungsvorrichtungexemplary ion exchange resin shredder
1212
Tanktank
1414
IonenaustauscherharzsuspensionIonenaustauscherharzsuspension
1616
Rührvorrichtungstirrer
1818
Antrieb von RührvorrichtungDrive of stirring device
2020
Mahlvorrichtunggrinder
2222
Pumpvorrichtungpumping device
2424
VorzerkleinerungsvorrichtungVorzerkleinerungsvorrichtung
2626
erstes Absperrventilfirst shut-off valve
2828
zweites Absperrventilsecond shut-off valve
3030
Zulauf für lonenaustauscherharzsuspensionFeed for ion exchanger resin suspension
3232
Füllstand IonenaustauscherharzsuspensionLevel of ion exchange resin suspension
3434
Abfilussrichtung vorzerkleinerte lonenaustauscherharzsuspensionFiltration direction pre-crushed ion exchange resin suspension
3636
Ablauf für gemahlene lonenaustauscherharzsuspensionProcedure for ground ion exchange resin suspension
3838
Filter der EntwässerungsvorrichtungFilter of the dewatering device
4040
Saugrohr der EntwässerungsvorrichtungSuction pipe of the dewatering device
4242
Pumpe der EntwässerungsvorrichtungPump of the dewatering device
4444
Transportwassertank der EntwässerungsvorrichtungTransport water tank of the dewatering device
4646
Rückführung der EntwässerungsvorrichtungReturn of the dewatering device

Claims (11)

  1. Ion-exchange resin milling apparatus (10) for radioactive ion-exchange resins, comprising
    • a tank (12) for holding an aqueous radioactive ion-exchange resin suspension (14),
    • a stirring apparatus (16) provided in the tank (12),
    • a grinding apparatus (20) provided outside the tank (12),
    • a pumping apparatus (22) for conveying the aqueous radioactive ion-exchange resin suspension (14) from the tank (12) to the grinding apparatus (20),
    • a pre-milling apparatus (24) being provided in the tank (12),
    characterized in that
    the pre-milling apparatus (24) is a disperser and the grinding apparatus (20) is a colloid mill.
  2. Ion-exchange resin milling apparatus according to Claim 1, characterized in that the colloid mill has a rotor/stator ring with an adjustable gap spacing.
  3. Ion-exchange resin milling apparatus according to Claim 1 or 2, characterized in that the rotor or stator ring of the colloid mill is respectively conically formed and has ridges and flutes in the upper region and a rough grinding surface in the lower region.
  4. Ion-exchange resin milling apparatus according to one of the preceding claims, characterized in that the grinding surfaces of the colloid mill are made of a metal, a metal carbide or a ceramic.
  5. Ion-exchange resin milling apparatus according to one of the preceding claims, characterized in that the stirring apparatus (16) is an anchor stirrer.
  6. Ion-exchange resin milling apparatus according to one of the preceding claims, characterized in that it has a dewatering apparatus for adjusting the water content of the aqueous ion-exchange resin suspension (14).
  7. Ion-exchange resin milling apparatus according to one of the preceding claims, characterized in that the tank (12) comprises a feed apparatus for water.
  8. Ion-exchange resin milling apparatus according to one of the preceding claims, characterized in that the grinding apparatus (20) is arranged underneath the tank (12).
  9. Ion-exchange resin milling method using an ion-exchange resin milling apparatus (10) according to one of Claims 1 to 8, comprising the following steps:
    • filling the tank (12) with an aqueous radioactive ion-exchange resin suspension (14),
    • pre-milling the resin particles of the radioactive ion-exchange resin suspension (14) by means of the pre-milling apparatus (24),
    • gradually emptying the tank (12) and conveying the radioactive ion-exchange resin suspension (14) to the grinding apparatus (20),
    • grinding the resin particles of the gradually supplied radioactive ion-exchange resin suspension (14) in the grinding apparatus (20).
  10. Ion-exchange resin milling method according to Claim 9, characterized in that, before the pre-milling by the pre-milling apparatus (24), the water content of the aqueous radioactive ion-exchange resin suspension (14) is adjusted.
  11. Ion-exchange resin milling method according to either of Claims 9 and 10, characterized in that the ground aqueous radioactive ion-exchange resin suspension (14) is dried and then solidified directly with a binder or put into a suitable container.
EP13759434.7A 2012-06-28 2013-06-28 Milling apparatus and millig process for ion exchange resins Active EP2867902B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012012828A DE102012012828A1 (en) 2012-06-28 2012-06-28 Ion exchange resin processing device for purifying sewage water discharged from nuclear power plant, has pumping device that is provided for feeding aqueous ion exchange resin suspension from tank to grinder
PCT/EP2013/001902 WO2014000890A1 (en) 2012-06-28 2013-06-28 Ion exchanger resin crushing apparatus and ion exchanger resin crushing process

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EP2867902A1 EP2867902A1 (en) 2015-05-06
EP2867902B1 true EP2867902B1 (en) 2016-04-20

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JP (1) JP6157612B2 (en)
CN (1) CN104428842B (en)
CA (1) CA2872705A1 (en)
DE (1) DE102012012828A1 (en)
ES (1) ES2579089T3 (en)
WO (1) WO2014000890A1 (en)

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DE202013100812U1 (en) * 2013-02-25 2014-06-02 Andritz Kmpt Gmbh Mixer-dryer
CN104502577B (en) * 2015-01-04 2016-08-24 上海核工程研究设计院 The test-bed of a kind of resin transhipment technique and test method thereof
DE102015102261A1 (en) * 2015-02-18 2016-08-18 Netzsch Feinmahltechnik Gmbh Mixing device and method for comminuting coarse components when discharging a product mixture from a mixing device
CN108447582B (en) * 2018-02-05 2021-06-29 中北大学 Suspension method of radioactive waste anion-cation exchange resin for nuclear power station
CN110385171A (en) * 2018-04-23 2019-10-29 昆山强迪粉碎设备有限公司 Colloid mill agitator tank discharging device
CN109821424A (en) * 2019-03-27 2019-05-31 苏州交创石墨烯新材料有限公司 The preparation process and device of porous ion exchange membrane
DE102021004501A1 (en) 2021-09-04 2023-03-09 Westinghouse Electric Germany Gmbh Ion exchange resin treatment system and method therefor

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BE548484A (en) * 1956-04-05
JPS5475000A (en) * 1977-11-28 1979-06-15 Hitachi Ltd Method of treating radioactive waste
WO1994009904A1 (en) * 1992-11-04 1994-05-11 Abb Atom Ab Method and device for treatment and disposal of spent ion-exchange resin
JP3939381B2 (en) * 1996-05-14 2007-07-04 株式会社中村自工 Recycler for thermoplastic resin and method for using regenerated resin
DE19701929A1 (en) * 1997-01-21 1998-07-23 Siemens Ag Device for processing ion exchange resin
DE10153430B4 (en) * 2001-10-30 2006-04-20 Kwade, Arno, Dr. Apparatus and method for comminuting and dispersing suspended particles in a liquid, for determining the comminuting and dispersing properties of the particles and for determining the rheological properties of the suspension
CN201769291U (en) * 2010-09-02 2011-03-23 宁波安力电子材料有限公司 Mixing and grinding device for phenolic resin
CN202071241U (en) * 2011-04-26 2011-12-14 江苏苏青水处理工程集团有限公司 Resin crushing device

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EP2867902A1 (en) 2015-05-06
CN104428842B (en) 2016-12-28
ES2579089T3 (en) 2016-08-04
JP2015529540A (en) 2015-10-08
CA2872705A1 (en) 2014-01-03
WO2014000890A1 (en) 2014-01-03
JP6157612B2 (en) 2017-07-05
CN104428842A (en) 2015-03-18
DE102012012828A1 (en) 2012-12-20

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