CA2872705A1 - Ion-exchange resin comminution device and method for ion-exchange resin comminution - Google Patents
Ion-exchange resin comminution device and method for ion-exchange resin comminution Download PDFInfo
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- CA2872705A1 CA2872705A1 CA2872705A CA2872705A CA2872705A1 CA 2872705 A1 CA2872705 A1 CA 2872705A1 CA 2872705 A CA2872705 A CA 2872705A CA 2872705 A CA2872705 A CA 2872705A CA 2872705 A1 CA2872705 A1 CA 2872705A1
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- ion
- exchange resin
- comminution
- tank
- crushing
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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
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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)
Abstract
The invention relates to an ion exchanger resin crushing apparatus (10), comprising a tank (12) for receiving an aqueous ion exchanger resin suspension (14), a stirring device (16), provided in the tank (12), a grinding device (20), provided outside the tank (12), and a pumping device (22), for transporting the aqueous ion exchanger resin suspension (14) from the tank (12) to the grinding device (20). Provided in the tank (12) is a pre-crushing device (24). The invention also relates to an ion exchanger resin crushing process that uses an ion exchanger resin crushing apparatus according to the invention.
Description
Ion-exchange resin comminution device and method for ion-exchange resin comminution Description The invention relates to an ion-exchange resin comminution device, comprising a tank for receiving an aqueous ion-exchange resin suspension, an agitation device which is provided in the tank, a crushing device which is provided outside the tank, and a pump device for conveying the aqueous ion-exchange resin suspension from the tank to the crushing device.
It is known for ion-exchange resins to be employed for the purification of water and/or waste water in conventional power stations, and nuclear facilities and power stations. It is, in particular, in the nuclear field that the radioactively contaminated ion-exchange resins have to be elaborately treated and disposed of. Methods such as dewatering, drying, or solidifying in a cement matrix are often employed here. When these methods are applied, the spherical ion-exchange resins may either be directly processed or be first crushed. To this end, mills such as, for example, corundum-disc mills are employed. The ion-exchange resins here are suspended in water and, in order to achieve the desired crushing result, are routed via the mill in a recirculation system. It may be necessary to crush ion-exchange resins in order to achieve better results in subsequent processes, such as, for example:
= reduced surface-formation tendency of crushed resins during cementing, = CA 02872705 2014-11-05 = improved thermal transfer during drying, on account of an enlarged surface, and thus shorter drying times, = improved compressive properties during high-pressure compression.
Patent document EP0963588 B1 discloses a device or a method in which an ion-exchange resin suspension located in a first container is supplied to a corundum-disc mill disposed outside of said container and, after the crushing process, is collected in a second container from where the ion-exchange resin suspension, in a recirculation operation, is again supplied to the corundum-disc mill.
By way of the corundum-disc mill mentioned in the prior art, fine crushing of the ion-exchange resins located in the suspension takes place by means of two corundum discs. These corundum discs are hard, brittle, and for the most part display a porous structure.
It is, in particular, the high porosity of the corundum discs that causes severe contamination of the discs with finely crushed ion-exchange resin, since the fine powder penetrates deep into the pores. This contamination can only be removed with great difficulty. Since ion-exchange resins may display a high dose rate, this contamination represents an extreme hazard to the personnel. The brittle properties of the corundum discs have the disadvantage that the discs may easily break and, in this case, need to be immediately replaced. Since such a replacement may only be manually performed, it is inevitable for the involved personnel to be exposed to a dose load.
In the method of the prior art mentioned, the ion-exchange resin, after passing through the corundum mill, is routed into a separate tank. This first = CA 02872705 2014-11-05 comminution step involving the corundum mill is necessary in order to render the ion-exchange resin suspension suitable for pumping and to enable recirculation. Spherical, non-comminuted ion-exchange resins would rapidly form sedimentation. The ion-exchange resins are then further comminuted during the recirculation operation.
This recirculation operation furthermore has the disadvantage that intermixing of already crushed and uncrushed spherical resins may arise, and/or intermixing of material which has already repeatedly passed through the mill and material which has only passed through the corundum mill in the first crushing step takes place. This intermixing requires a long recirculation operation in order to achieve the desired distribution of grain sizes and/or to ensure that each grain has passed through the mill at least once. The mentioned solution furthermore demands the use of two tanks, on account of which, on the one hand, not only the contaminated surface is disadvantageously increased but also the space requirement. However, tight space conditions in nuclear facilities are a known limiting factor.
Proceeding from 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 as possible are contaminated, and with which as small a dose load as possible exists for the operating and/or maintenance personnel. It is also an object of the invention to state a corresponding method.
This object is achieved by an ion-exchange resin comminution device of the type mentioned at the outset.
Said ion-exchange resin comminution device is . .
It is known for ion-exchange resins to be employed for the purification of water and/or waste water in conventional power stations, and nuclear facilities and power stations. It is, in particular, in the nuclear field that the radioactively contaminated ion-exchange resins have to be elaborately treated and disposed of. Methods such as dewatering, drying, or solidifying in a cement matrix are often employed here. When these methods are applied, the spherical ion-exchange resins may either be directly processed or be first crushed. To this end, mills such as, for example, corundum-disc mills are employed. The ion-exchange resins here are suspended in water and, in order to achieve the desired crushing result, are routed via the mill in a recirculation system. It may be necessary to crush ion-exchange resins in order to achieve better results in subsequent processes, such as, for example:
= reduced surface-formation tendency of crushed resins during cementing, = CA 02872705 2014-11-05 = improved thermal transfer during drying, on account of an enlarged surface, and thus shorter drying times, = improved compressive properties during high-pressure compression.
Patent document EP0963588 B1 discloses a device or a method in which an ion-exchange resin suspension located in a first container is supplied to a corundum-disc mill disposed outside of said container and, after the crushing process, is collected in a second container from where the ion-exchange resin suspension, in a recirculation operation, is again supplied to the corundum-disc mill.
By way of the corundum-disc mill mentioned in the prior art, fine crushing of the ion-exchange resins located in the suspension takes place by means of two corundum discs. These corundum discs are hard, brittle, and for the most part display a porous structure.
It is, in particular, the high porosity of the corundum discs that causes severe contamination of the discs with finely crushed ion-exchange resin, since the fine powder penetrates deep into the pores. This contamination can only be removed with great difficulty. Since ion-exchange resins may display a high dose rate, this contamination represents an extreme hazard to the personnel. The brittle properties of the corundum discs have the disadvantage that the discs may easily break and, in this case, need to be immediately replaced. Since such a replacement may only be manually performed, it is inevitable for the involved personnel to be exposed to a dose load.
In the method of the prior art mentioned, the ion-exchange resin, after passing through the corundum mill, is routed into a separate tank. This first = CA 02872705 2014-11-05 comminution step involving the corundum mill is necessary in order to render the ion-exchange resin suspension suitable for pumping and to enable recirculation. Spherical, non-comminuted ion-exchange resins would rapidly form sedimentation. The ion-exchange resins are then further comminuted during the recirculation operation.
This recirculation operation furthermore has the disadvantage that intermixing of already crushed and uncrushed spherical resins may arise, and/or intermixing of material which has already repeatedly passed through the mill and material which has only passed through the corundum mill in the first crushing step takes place. This intermixing requires a long recirculation operation in order to achieve the desired distribution of grain sizes and/or to ensure that each grain has passed through the mill at least once. The mentioned solution furthermore demands the use of two tanks, on account of which, on the one hand, not only the contaminated surface is disadvantageously increased but also the space requirement. However, tight space conditions in nuclear facilities are a known limiting factor.
Proceeding from 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 as possible are contaminated, and with which as small a dose load as possible exists for the operating and/or maintenance personnel. It is also an object of the invention to state a corresponding method.
This object is achieved by an ion-exchange resin comminution device of the type mentioned at the outset.
Said ion-exchange resin comminution device is . .
characterized in that a pre-comminution device is provided in the tank.
The core concept of the invention lies in sub-dividing the crushing process into two distinct crushing steps which are carried out by two different crushing assemblies. In this manner, according to the invention, a first crushing step is provided, namely a pre-comminution process in order to render the ion-exchange resin suspension suitable for pumping. The crushing process per se to form a fine-grained powder then takes place in a second crushing step.
On account the first crushing assembly, i.e. the pre-comminution device, being arranged directly in the tank, it is advantageously made possible for the ion-exchange resin suspension to be rendered suitable for pumping already in the tank. Following a corresponding comminution process of an ion-exchange resin suspension located in the tank, the ion-exchange resin particles which are contained therein are pre-comminuted to such an extent that the ion-exchange resin suspension, by means of the pump device, can be supplied to the second crushing assembly, i.e. the crushing device. On account of the pre-comminution of the ion-exchange resin particles that has already taken place, a single passage through the crushing device is furthermore sufficient in order to achieve the desired crushing result and/or the desired grain distribution. On account of the task of comminution being split in a modular manner according to the invention into pre-comminution and crushing, a second tank may thus advantageously be dispensed with. On account thereof, both the contaminated surface and also the space requirement of the comminution device are advantageously minimized.
The core concept of the invention lies in sub-dividing the crushing process into two distinct crushing steps which are carried out by two different crushing assemblies. In this manner, according to the invention, a first crushing step is provided, namely a pre-comminution process in order to render the ion-exchange resin suspension suitable for pumping. The crushing process per se to form a fine-grained powder then takes place in a second crushing step.
On account the first crushing assembly, i.e. the pre-comminution device, being arranged directly in the tank, it is advantageously made possible for the ion-exchange resin suspension to be rendered suitable for pumping already in the tank. Following a corresponding comminution process of an ion-exchange resin suspension located in the tank, the ion-exchange resin particles which are contained therein are pre-comminuted to such an extent that the ion-exchange resin suspension, by means of the pump device, can be supplied to the second crushing assembly, i.e. the crushing device. On account of the pre-comminution of the ion-exchange resin particles that has already taken place, a single passage through the crushing device is furthermore sufficient in order to achieve the desired crushing result and/or the desired grain distribution. On account of the task of comminution being split in a modular manner according to the invention into pre-comminution and crushing, a second tank may thus advantageously be dispensed with. On account thereof, both the contaminated surface and also the space requirement of the comminution device are advantageously minimized.
Furthermore, the recirculation operation involving the mill and the uncertainties connected therewith in respect of the distribution of grain sizes and the tendency towards formation of sediments are dispensed with on account of the pre-comminution in the tank.
Splitting comminution into two steps, pre-comminuting and crushing, ensures that each particle makes its way exactly once through the crushing device. Moreover, splitting comminution of the ion-exchange resins among two crushing assemblies makes it possible to flexibly adapt the existing components of the comminution device to the respective task of comminution. If no crushing device is required for achieving the respective process objective, for example minimizing the tendency to float on the surface, then only the pre-comminution device integrated in the tank may be used and the crushing device may be circumvented via a corresponding bypass.
The following advantages are achieved using the ion-exchange resin comminution device according to the invention:
= reduction of the dose rate for personnel during interventions (maintenance or fault repair, for example) and thus an improvement of radiation protection for personnel, = reduction of ionizing radiation which emanates from the crushing tools, = reduced probability of breakdowns, = relinquishment of time-intensive recirculation operation, = reduced space requirement, = flexible spatial installation, on account of integrating pre-comminution in the tank, = flexible adaptation of the device components to the process-technological requirements.
According to a particularly preferred design variant of the invention, the pre-comminution device is a . . CA 02872705 2014-11-05 disperser. Dispersers operate according to the principle of a rotor and a stator, are suited to the manufacture of emulsions and suspensions and can be designed so as to be integrated in a tank in a particularly simple manner. The rotor/stator rim used preferably has a spacing of --- 1 mm and is integrated in the tank.
According to a furthermore preferred design of the ion-exchange resin comminution device according to the invention the crushing device is a colloid mill. A
colloid mill crushes according to the rotor/stator principle. Products which are from highly fluid to highly viscous are comminuted, dispersed or homogenized in a narrow gap between the toothed faces of the rotor disc and stator disc. A very high shear rate which is responsible for the comminution effect is created on account of the narrow gap and the high rotational speed. A colloid mill which is suited according to the invention is preferably distinguished in that the rotor and the stator are implemented so as to be conical.
Ideally, grooves and lands are provided in the upper region, and a rough crushing face is provided in the lower region. A design of this type is conducive to a particularly good crushing result for the ion-exchange resins to be crushed. Materials which may be considered for the crushing face are metal carbides or ceramics, for example.
Adhering to a further variant of the invention, the colloid mill includes a rotor/stator rim having adjustable gap spacing. The shear rate can thus be infinitely set by way of the crushing gap, and the properties of the crushed ion-exchange resin are therefore advantageously influenced in a corresponding manner to the respective process objective. Setting of the desired grain distribution of the product when exiting the colloid mill takes place by way of the duration of pre-crushing in the tank, corresponding setting of the crushing gap of the colloid mill, the solids content of the product, but also by way of the product pressure ahead of the colloid mill, which can be set via the pump. Moreover, when needed, in order to achieve a wider grain distribution in the final product there is the possibility of circumventing the mill via a bypass, wherein the crushed product is intermixed with the pre-comminuted product.
According to a further variant of embodiment of the ion-exchange resin comminution device according to the invention, the agitation device in the tank is implemented as an anchor agitator. Anchor agitators are particularly suitable for keeping a volume of a suspension which is located in a storage tank in constant motion and to thus prevent the formation of sediment.
According to a further variant according to the invention, the ion-exchange resin comminution device includes a dewatering device for adapting the water content of the aqueous ion-exchange resin suspension.
Depending on the origin of the ion-exchange resin to be comminuted and disposed of or, respectively, of the ion-exchange resin suspension, if applicable the latter has a different water content. However, in order to achieve an optimal crushing result and high process efficiency, it is typically necessary for an ion-exchange resin suspension having a fixed water content to be kept ready. The ion-exchange resin comminution device is therefore laid out so that a fixed water content can be set. In order to achieve this water content, the ion-exchange resin suspension is initially dewatered, and a defined amount of water is subsequently added again. For the case in which the ion-exchange resin suspension has too low a water content, a supply device for water is provided.
Splitting comminution into two steps, pre-comminuting and crushing, ensures that each particle makes its way exactly once through the crushing device. Moreover, splitting comminution of the ion-exchange resins among two crushing assemblies makes it possible to flexibly adapt the existing components of the comminution device to the respective task of comminution. If no crushing device is required for achieving the respective process objective, for example minimizing the tendency to float on the surface, then only the pre-comminution device integrated in the tank may be used and the crushing device may be circumvented via a corresponding bypass.
The following advantages are achieved using the ion-exchange resin comminution device according to the invention:
= reduction of the dose rate for personnel during interventions (maintenance or fault repair, for example) and thus an improvement of radiation protection for personnel, = reduction of ionizing radiation which emanates from the crushing tools, = reduced probability of breakdowns, = relinquishment of time-intensive recirculation operation, = reduced space requirement, = flexible spatial installation, on account of integrating pre-comminution in the tank, = flexible adaptation of the device components to the process-technological requirements.
According to a particularly preferred design variant of the invention, the pre-comminution device is a . . CA 02872705 2014-11-05 disperser. Dispersers operate according to the principle of a rotor and a stator, are suited to the manufacture of emulsions and suspensions and can be designed so as to be integrated in a tank in a particularly simple manner. The rotor/stator rim used preferably has a spacing of --- 1 mm and is integrated in the tank.
According to a furthermore preferred design of the ion-exchange resin comminution device according to the invention the crushing device is a colloid mill. A
colloid mill crushes according to the rotor/stator principle. Products which are from highly fluid to highly viscous are comminuted, dispersed or homogenized in a narrow gap between the toothed faces of the rotor disc and stator disc. A very high shear rate which is responsible for the comminution effect is created on account of the narrow gap and the high rotational speed. A colloid mill which is suited according to the invention is preferably distinguished in that the rotor and the stator are implemented so as to be conical.
Ideally, grooves and lands are provided in the upper region, and a rough crushing face is provided in the lower region. A design of this type is conducive to a particularly good crushing result for the ion-exchange resins to be crushed. Materials which may be considered for the crushing face are metal carbides or ceramics, for example.
Adhering to a further variant of the invention, the colloid mill includes a rotor/stator rim having adjustable gap spacing. The shear rate can thus be infinitely set by way of the crushing gap, and the properties of the crushed ion-exchange resin are therefore advantageously influenced in a corresponding manner to the respective process objective. Setting of the desired grain distribution of the product when exiting the colloid mill takes place by way of the duration of pre-crushing in the tank, corresponding setting of the crushing gap of the colloid mill, the solids content of the product, but also by way of the product pressure ahead of the colloid mill, which can be set via the pump. Moreover, when needed, in order to achieve a wider grain distribution in the final product there is the possibility of circumventing the mill via a bypass, wherein the crushed product is intermixed with the pre-comminuted product.
According to a further variant of embodiment of the ion-exchange resin comminution device according to the invention, the agitation device in the tank is implemented as an anchor agitator. Anchor agitators are particularly suitable for keeping a volume of a suspension which is located in a storage tank in constant motion and to thus prevent the formation of sediment.
According to a further variant according to the invention, the ion-exchange resin comminution device includes a dewatering device for adapting the water content of the aqueous ion-exchange resin suspension.
Depending on the origin of the ion-exchange resin to be comminuted and disposed of or, respectively, of the ion-exchange resin suspension, if applicable the latter has a different water content. However, in order to achieve an optimal crushing result and high process efficiency, it is typically necessary for an ion-exchange resin suspension having a fixed water content to be kept ready. The ion-exchange resin comminution device is therefore laid out so that a fixed water content can be set. In order to achieve this water content, the ion-exchange resin suspension is initially dewatered, and a defined amount of water is subsequently added again. For the case in which the ion-exchange resin suspension has too low a water content, a supply device for water is provided.
A dewatering device includes, for example, a suction pipe which has a filter and which connects with the floor of the tank. As long as the ion-exchange resins have not yet been comminuted but are spherical, the ion-exchange resins cannot pass through this filter.
When dewatering, the water is pumped away via the suction pipe and the associated filter by means of a pump, and filled into a transport water tank.
Subsequent setting of the water content takes place via a dosed reefed of the water into the tank. If the ion-exchange resins contain too much water, the excess water is returned back into the power-station system.
It is furthermore possible to set the water content by way of water jets in the tank.
According to a likewise preferred design variant of the ion-exchange resin comminution device, the crushing device is arranged below the tank. The tank is implemented as an upright hollow cylinder having, in its floor region, an outlet opening which tapers in a funnel-like manner, for example. If the tank is placed on a stand, the crushing device can be positioned in a particularly space-saving manner under the tank.
The object according to the invention is also achieved by a method for ion-exchange resin comminution having an ion-exchange resin comminution device according to the invention, and comprises the following steps:
= filling the tank with an aqueous ion-exchange resin suspension, = pre-comminuting the resin particles of the ion-exchange resin suspension by means of the pre-comminution device, = successively emptying the tank and infeeding the ion-exchange resin suspension to the crushing device, = crushing the resin particles of the successively infed ion-exchange resin suspension in the crushing device.
A tank according to the invention comprises a volume in the range of 500 1 to 2000 1, for example, and at the beginning of the method according to the invention is to be filled with the desired amount of an ion-exchange resin suspension to be comminuted, preferably with an ion-exchange resin suspension having a defined water content/solids content. Subsequently, the pre-comminution process which, depending on the process objective, may take up to 60 min., for example, takes place. After pre-comminution of the ion-exchange resin particles located in the suspension, the ion-exchange resin suspension is pumped away via an outlet in the lower region of the tank, and supplied to the crushing device. The pressure which may be set depending on requirements and which is built up by the associated pump in relation to the crushing device may optionally also be used in a targeted manner for influencing the crushing result. Find comminution of the ion-exchange resin suspension or the resin particles contained therein is accomplished after a single passage through the crushing device. The advantages of this method correspond to those mentioned above for the ion-exchange resin comminution device according to the invention.
According to a further variant of the method, prior to pre-comminution by the pre-comminution device, the water content of the aqueous ion-exchange resin suspension is adapted. A constant water content has an advantageous effect on the crushing result or on the grain distribution, respectively, and on the stability of the process.
When dewatering, the water is pumped away via the suction pipe and the associated filter by means of a pump, and filled into a transport water tank.
Subsequent setting of the water content takes place via a dosed reefed of the water into the tank. If the ion-exchange resins contain too much water, the excess water is returned back into the power-station system.
It is furthermore possible to set the water content by way of water jets in the tank.
According to a likewise preferred design variant of the ion-exchange resin comminution device, the crushing device is arranged below the tank. The tank is implemented as an upright hollow cylinder having, in its floor region, an outlet opening which tapers in a funnel-like manner, for example. If the tank is placed on a stand, the crushing device can be positioned in a particularly space-saving manner under the tank.
The object according to the invention is also achieved by a method for ion-exchange resin comminution having an ion-exchange resin comminution device according to the invention, and comprises the following steps:
= filling the tank with an aqueous ion-exchange resin suspension, = pre-comminuting the resin particles of the ion-exchange resin suspension by means of the pre-comminution device, = successively emptying the tank and infeeding the ion-exchange resin suspension to the crushing device, = crushing the resin particles of the successively infed ion-exchange resin suspension in the crushing device.
A tank according to the invention comprises a volume in the range of 500 1 to 2000 1, for example, and at the beginning of the method according to the invention is to be filled with the desired amount of an ion-exchange resin suspension to be comminuted, preferably with an ion-exchange resin suspension having a defined water content/solids content. Subsequently, the pre-comminution process which, depending on the process objective, may take up to 60 min., for example, takes place. After pre-comminution of the ion-exchange resin particles located in the suspension, the ion-exchange resin suspension is pumped away via an outlet in the lower region of the tank, and supplied to the crushing device. The pressure which may be set depending on requirements and which is built up by the associated pump in relation to the crushing device may optionally also be used in a targeted manner for influencing the crushing result. Find comminution of the ion-exchange resin suspension or the resin particles contained therein is accomplished after a single passage through the crushing device. The advantages of this method correspond to those mentioned above for the ion-exchange resin comminution device according to the invention.
According to a further variant of the method, prior to pre-comminution by the pre-comminution device, the water content of the aqueous ion-exchange resin suspension is adapted. A constant water content has an advantageous effect on the crushing result or on the grain distribution, respectively, and on the stability of the process.
According to a further variant of the ion-exchange resin comminution method according to the invention, the crushed aqueous ion-exchange resin suspension is subsequently dried. It can be thereafter more readily supplied to final disposing, for example by way of high-pressure compression. The compacted pellets created in this manner are particularly optimized for volume, may be optionally cast together with cement, and be subsequently supplied to the final storage.
Further advantageous possibilities of embodiment may be obtained from the further dependent claims.
The invention, further embodiments and further advantages are to be described in more detail by means of the exemplary embodiments illustrated in the drawing, in which:
Fig. 1 shows an exemplary ion-exchange resin comminution device.
Fig. 1 shows an exemplary ion-exchange resin comminution device 10 in a schematic view. A tank 12 is filled with an ion-exchange resin suspension 14, the filling level being indicated by the line having the reference sign 21. The tank 12 is made of stainless steel and has a filling volume of 800 1, for example, or also significantly more. In its upper region, it is implemented in a hollow-cylindrical manner, and in its base region tapers in a funnel-like manner towards an outlet opening. However, embodiments without a constriction of this type are also possible. In the upper region of said tank, an inlet 30 for an ion-exchange resin suspension is provided, said inlet 30 being closable by way of a shut-off valve 28. It goes without saying that a plurality of inlet valves may also be provided, such that the final suspension is only formed in the tank 12.
Further advantageous possibilities of embodiment may be obtained from the further dependent claims.
The invention, further embodiments and further advantages are to be described in more detail by means of the exemplary embodiments illustrated in the drawing, in which:
Fig. 1 shows an exemplary ion-exchange resin comminution device.
Fig. 1 shows an exemplary ion-exchange resin comminution device 10 in a schematic view. A tank 12 is filled with an ion-exchange resin suspension 14, the filling level being indicated by the line having the reference sign 21. The tank 12 is made of stainless steel and has a filling volume of 800 1, for example, or also significantly more. In its upper region, it is implemented in a hollow-cylindrical manner, and in its base region tapers in a funnel-like manner towards an outlet opening. However, embodiments without a constriction of this type are also possible. In the upper region of said tank, an inlet 30 for an ion-exchange resin suspension is provided, said inlet 30 being closable by way of a shut-off valve 28. It goes without saying that a plurality of inlet valves may also be provided, such that the final suspension is only formed in the tank 12.
An agitation device 16, which is driven by a drive 18 located on the outside, protrudes centrally from above into the tank 12. The agitation device 16, by way of a rotating motion, keeps the suspension 14 in constant motion and prevents the formation of sediment of ion-exchange resin particles. In the lower region of the tank 12 a pre-comminution device 24, in this case a disperser, is integrated in the former. In the context of this invention, integrated means that at least the components of the disperser which, for the purpose of dispersing, have to be in contact with the ion-exchange resin suspension 14, at least partially protrude into the tank. The arrangement of all components of the pre-comminution device 24 so as to be completely within the tank 12 is not required.
Upon completion of a pre-comminution process, a shut-off valve 26 which is connected to the outlet of the tank is opened, and the pre-comminuted ion-exchange resin suspension 14 is pumped in the direction of the arrow 34, from a pump device 22 to a crushing device 20. On account of the pre-comminution which has taken place, the ion-exchange resin suspension 14 has indeed been rendered suitable for pumping in the first place.
The crushing device 20 in this case is implemented as a colloid mill and, depending on the peripheral parameters, such as, for example, the crushing gap or the upstream pressure of the pump, comminutes the pre-comminuted resin particles of the ion-exchange resin suspension 14 to a fine powder. Via a discharge 36 the crushed ion-exchange resin suspension 14 is then supplied for further use.
If required, a bypass of the crushing device is also to be provided, for example if, corresponding to the respective process specifications, pre-comminuting the resin particles of the ion-exchange resin suspension 14 is sufficient.
In the lower tank region a filter 38 and a suction pipe 40 of a dewatering device, by means of which the ion-exchange resin suspension 14 located in the tank 12 can be dewatered, are furthermore shown. The non-comminuted ion-exchange resin particles are approximately spherical and cannot pass through the filter 38. In a suctioning-off process by means of a pump 42 water is thus pumped from the ion-exchange resin suspension into a transport water tank 44 until the ion-exchange resin suspension is dewatered. The tank 12 is subsequently supplied with water again via a refeed 46 until the desired water content is achieved.
Upon completion of a pre-comminution process, a shut-off valve 26 which is connected to the outlet of the tank is opened, and the pre-comminuted ion-exchange resin suspension 14 is pumped in the direction of the arrow 34, from a pump device 22 to a crushing device 20. On account of the pre-comminution which has taken place, the ion-exchange resin suspension 14 has indeed been rendered suitable for pumping in the first place.
The crushing device 20 in this case is implemented as a colloid mill and, depending on the peripheral parameters, such as, for example, the crushing gap or the upstream pressure of the pump, comminutes the pre-comminuted resin particles of the ion-exchange resin suspension 14 to a fine powder. Via a discharge 36 the crushed ion-exchange resin suspension 14 is then supplied for further use.
If required, a bypass of the crushing device is also to be provided, for example if, corresponding to the respective process specifications, pre-comminuting the resin particles of the ion-exchange resin suspension 14 is sufficient.
In the lower tank region a filter 38 and a suction pipe 40 of a dewatering device, by means of which the ion-exchange resin suspension 14 located in the tank 12 can be dewatered, are furthermore shown. The non-comminuted ion-exchange resin particles are approximately spherical and cannot pass through the filter 38. In a suctioning-off process by means of a pump 42 water is thus pumped from the ion-exchange resin suspension into a transport water tank 44 until the ion-exchange resin suspension is dewatered. The tank 12 is subsequently supplied with water again via a refeed 46 until the desired water content is achieved.
List of reference signs Exemplary ion-exchange resin comminution device 12 Tank 14 Ion-exchange resin suspension 16 Agitation device 18 Drive of the agitation device Crushing device 22 Pump device 24 Pre-comminution device 26 First shut-off valve 28 Second shut-off valve Inlet for ion-exchange resin suspension 32 Fill level of ion-exchange resin suspension 34 Outflow direction of pre-comminuted ion-exchange resin suspension 36 Discharge for crushed ion-exchange resin suspension 38 Filter of the dewatering device Suction pipe of the dewatering device 42 Pump of the dewatering device 44 Transport water tank of the dewatering device 46 Refeed of the dewatering device
Claims (13)
1. Ion-exchange resin comminution device (10), comprising .cndot. a tank (12) for receiving an aqueous ion-exchange resin suspension (14), .cndot. an agitation device (16) which is provided in the tank (12), .cndot. a crushing device (20) which is provided outside the tank (12), .cndot. a pump device (22) for conveying the aqueous ion-exchange resin suspension (14) from the tank (12) to the crushing device (20), characterized in that a pre-comminution device (24) is provided in the tank (12).
2. Ion-exchange resin comminution device according to Claim 1, characterized in that the pre-comminution device (24) is a disperser.
3. Ion-exchange resin comminution device according to either of Claims 1 and 2, characterized in that the crushing device (20) is a colloid mill.
4. Ion-exchange resin comminution device according to Claim 3, characterized in that the colloid mill includes a rotor/stator rim having adjustable gap spacing.
5. Ion-exchange resin comminution device according to either of Claims 3 and 4, characterized in that the rotor rim or stator rim, respectively, of the colloid mill is in each case implemented so as to be conical and, in the upper region, displays grooves and lands, and, in the lower region, has a rough crushing face.
6. Ion-exchange resin comminution device according to one of Claims 3 to 5, characterized in that the crushing faces of the colloid mill are made of a metal, a metal carbide, or a ceramic material.
7. Ion-exchange resin comminution device according to one of the preceding claims, characterized in that the agitation device (16) is an anchor agitator.
8. Ion-exchange resin comminution device according to one of the preceding claims, characterized in that the former includes a dewatering device for adapting the water content of the aqueous ion-exchange resin suspension (14).
9. Ion-exchange resin comminution device according to one of the preceding claims, characterized in that the tank (12) comprises a supply device for water.
10. Ion-exchange resin comminution device according to one of the preceding claims, characterized in that the crushing device (20) is arranged below the tank (12).
11. Method for ion-exchange resin comminution, having an ion-exchange resin comminution device (10) according to one of Claims 1 to 10, comprising the following steps:
.cndot. filling the tank (12) with an aqueous ion-exchange resin suspension (14), .cndot. pre-comminuting the resin particles of the ion-exchange resin suspension (14) by means of the pre-comminution device (24), .cndot. successively emptying the tank (12) and infeeding the ion-exchange resin suspension (14) to the crushing device (20), .cndot. crushing the resin particles of the successively infed ion-exchange resin suspension (14) in the crushing device (20).
.cndot. filling the tank (12) with an aqueous ion-exchange resin suspension (14), .cndot. pre-comminuting the resin particles of the ion-exchange resin suspension (14) by means of the pre-comminution device (24), .cndot. successively emptying the tank (12) and infeeding the ion-exchange resin suspension (14) to the crushing device (20), .cndot. crushing the resin particles of the successively infed ion-exchange resin suspension (14) in the crushing device (20).
12. Method for ion-exchange resin comminution according to Claim 11, characterized in that, prior to pre-comminution by the pre-comminution device (24), the water content of the aqueous ion-exchange resin suspension (14) is adapted.
13. Method for ion-exchange resin comminution according to either of Claims 9 and 10, characterized in that the crushed aqueous ion-exchange resin suspension (14) is dried and thereafter is directly solidified using a binding agent, or is filled into a suitable container.
Applications Claiming Priority (3)
| 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 |
| DE102012012828.2 | 2012-06-28 | ||
| PCT/EP2013/001902 WO2014000890A1 (en) | 2012-06-28 | 2013-06-28 | Ion exchanger resin crushing apparatus and ion exchanger resin crushing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2872705A1 true CA2872705A1 (en) | 2014-01-03 |
Family
ID=47228574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2872705A Abandoned CA2872705A1 (en) | 2012-06-28 | 2013-06-28 | Ion-exchange resin comminution device and method for ion-exchange resin comminution |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP2867902B1 (en) |
| JP (1) | JP6157612B2 (en) |
| CN (1) | CN104428842B (en) |
| CA (1) | CA2872705A1 (en) |
| DE (1) | DE102012012828A1 (en) |
| ES (1) | ES2579089T3 (en) |
| WO (1) | WO2014000890A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2012
- 2012-06-28 DE DE102012012828A patent/DE102012012828A1/en not_active Withdrawn
-
2013
- 2013-06-28 CN CN201380034271.2A patent/CN104428842B/en active Active
- 2013-06-28 CA CA2872705A patent/CA2872705A1/en not_active Abandoned
- 2013-06-28 WO PCT/EP2013/001902 patent/WO2014000890A1/en active Application Filing
- 2013-06-28 JP JP2015518893A patent/JP6157612B2/en not_active Expired - Fee Related
- 2013-06-28 ES ES13759434.7T patent/ES2579089T3/en active Active
- 2013-06-28 EP EP13759434.7A patent/EP2867902B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015529540A (en) | 2015-10-08 |
| DE102012012828A1 (en) | 2012-12-20 |
| CN104428842B (en) | 2016-12-28 |
| EP2867902A1 (en) | 2015-05-06 |
| WO2014000890A1 (en) | 2014-01-03 |
| EP2867902B1 (en) | 2016-04-20 |
| ES2579089T3 (en) | 2016-08-04 |
| JP6157612B2 (en) | 2017-07-05 |
| CN104428842A (en) | 2015-03-18 |
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| Date | Code | Title | Description |
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| EEER | Examination request |
Effective date: 20171219 |
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| FZDE | Discontinued |
Effective date: 20210208 |