JP5488008B2 - Contamination separator - Google Patents

Description

This invention relates to the co emissions Tamil Nation separation equipment.

  When foreign materials such as metals (hereinafter referred to as “metal foreign materials”) as contamination (contaminants) enter the active material of non-aqueous secondary batteries such as lithium ion batteries, the metal foreign materials are eluted and deposited in the cell. The battery can cause an internal short circuit. Some automobile batteries take a countermeasure against contamination due to the long life cycle and the magnitude of the short-circuit current when an internal short circuit occurs (see Patent Document 1).

JP 2009-164062 A

  By the way, in the technique of the said patent document 1, the metal foreign material mixed in the active material is captured by magnetic force (the magnetic selection part which inserted the magnet bar | burr is provided). However, when the metal foreign matter forms aggregated particles with the active material, the aggregated particles are collected as contamination, and the utilization rate of the active material is deteriorated.

  Then, an object of this invention is to provide the apparatus and method which can raise the utilization factor of an active material.

The present invention has a material inlet at one end of the case and an outlet at the other end of the case, and the aggregated particles in the case containing primary particles and impurity particles of the active material are directed from the material inlet to the outlet. A conveying means for conveying, an ultrasonic wave generating means, and an impurity separation unit are provided. Then, the ultrasonic wave generating means decomposes the aggregated particles into single particles by applying an ultrasonic wave stepwise to the aggregated particles conveyed by the conveying means in accordance with the particle size distribution of the active material. The impurity separation unit introduces primary particles of the active material decomposed into single particles and impurity particles decomposed into single particles discharged from the discharge port, and contaminates and separates only the impurity particles. .

According to the present invention, since the ultrasonic wave having a frequency matched to the particle size distribution of the active material is made to act on the agglomerated particles containing the foreign metal particles in a stepwise manner, the particles of the active material having a certain particle size distribution Even when a metal foreign matter is mixed in to form aggregated particles, decomposition into single particles can be performed reliably.

It is a schematic block diagram of the contamination separation apparatus of a comparative example . It is a partially expanded schematic diagram of the contamination separation apparatus of 1st Embodiment of this invention . It is a particle size distribution figure of a 1st embodiment. It is an expansion schematic of the material supply part of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a contamination separation apparatus 1 of a comparative example . The contamination separation device 1 includes an agglomerated particle decomposition device.

  In FIG. 1, the contamination separating apparatus 1 includes a screw feeder 2 (conveying means). The screw feeder 2 has a material inlet at one end of the case 3 and an outlet at the other end of the case 3, and an active material (non-aqueous secondary battery) is directed from the material inlet to the outlet by rotating the screw. The agglomerated particles in the case 3 containing the particles of the electrode material) and the impurity particles are conveyed.

Specifically, the screw feeder case 3 includes a material storage unit 4 and a material supply unit 5. A material charging port 4a is provided in the upper part of the material storage unit 4, and a powder of lithium manganate (LiMn ₂ O ₄ ), which is an active material, is charged through the material charging port 4a as shown by an arrow A in FIG. The lithium manganate is pulverized by a mill into particles in a particle size range having a distribution of 5 to 40 μm (this particle is referred to as “primary particles”). Hereinafter, primary particles of lithium manganate may be simply referred to as primary particles.

  The material supply part 5 whose one end opens at the lower part of the side wall of the material storage part 4 is formed in a substantially cylindrical shape, and a discharge port 5 a is provided at the other end (right end in the figure) of the material supply part 5. The discharge port 5 a is open to the side wall 8 a of the cylindrical separation mechanism portion 8.

  A screw 6 is provided through the lower part of the material supply unit 5 and the material storage unit 4. With this screw 6, the primary particles of lithium manganate are conveyed from the material reservoir 4 to the outlet 5a as shown by the arrow B in FIG. From the discharge port 5a, primary particles of lithium manganate are dropped into the separation mechanism 8 as indicated by an arrow C in FIG. Reference numeral 7 denotes a motor for driving the screw 6.

  The material of the case 3 is a flexible resin, and the material storage unit 4 and the material supply unit 5 are integrally formed of resin.

  It has been pointed out that metal foreign matters are mixed during the manufacturing process of the non-aqueous secondary battery. The particle size of lithium manganate is 5 to 40 μm, and the primary particles in these particle size ranges have a characteristic that they tend to aggregate due to the intermolecular force. In this case, aggregation occurs between primary particles of lithium manganate and primary particles of lithium manganate, but aggregation also easily occurs between primary particles of lithium manganate and the metal foreign matter. In other words, aggregated particles obtained by agglomerating primary particles of lithium manganate or aggregated particles obtained by agglomerating primary particles of lithium manganate and metal foreign matter are generated inside the material reservoir 4. The primary particles of lithium manganate in a non-aggregated state and the metal foreign matter in a non-aggregated state are hereinafter referred to as “single particles”.

  In FIG. 1, aggregated particles G1 in which primary particles S of lithium manganate are aggregated and aggregated particles G2 in which primary particles S of lithium manganate and metal foreign matter L are aggregated are shown as models in the material storage unit 4. ing. Here, for simplicity, it is assumed that the primary particles S of lithium manganate have a uniform diameter, the primary particles S of lithium manganate are represented by relatively small particles, and the metal foreign matter L is represented by relatively large particles. . In addition, although each particle | grains S and L are shown with the spherical shape, it is not limited to when the shape of each particle | grains S and L is spherical.

  Now, especially when the active material is formed using the aggregated particles G2 containing the metal foreign matter L (that is, when the metal foreign matter is mixed in the active material of the battery), the metal foreign matter L is eluted and precipitated in the cell, and the battery. May cause an internal short circuit. Since the battery for automobiles has a long life cycle and the magnitude of the short-circuit current when an internal short circuit occurs, it is necessary to remove the metal foreign matter L.

  In this case, there is one that captures the metal foreign matter mixed in the active material by magnetic force (providing a magnetic separator with a magnet rod inserted). However, when the metallic foreign matter L forms the aggregated particles G2 with the primary particles S (active material) of lithium manganate as described above, the aggregated particles G2 are collected as contamination, and lithium manganate ( The utilization rate of the active material) becomes worse.

  On the other hand, using an airflow crusher that pulverizes raw materials by colliding with each other by a jet stream, the active material primary particles and the agglomerated particles containing impurity particles are pulverized and decomposed into primary particles of active material and metallic foreign matter (See Japanese Patent No. 3395335).

  However, this agglomerated particle decomposition method has the following problems.

<1> The probability that aggregated particles do not collide with each other is high, and aggregated particles that are not crushed remain. When a single particle having a relatively light mass collides with an aggregated particle having a relatively large mass, the aggregated particle is not pulverized and there is a high possibility that aggregated particles containing primary particles and impurity particles of the active material remain.

<2> The mass of the aggregated particles that are not crushed is heavy and falls down vertically due to airflow separation and is separated as contamination. Since the aggregated particles separated as the contamination contain primary particles of the active material, the material yield is deteriorated.

Therefore, in the comparative example , ultrasonic generators 15 and 16 (ultrasonic waves) are applied to the material supply unit 5 to which the aggregated particles including the primary particles and the impurity particles of the active material are conveyed. Two sound wave generating means) are arranged in series. The ultrasonic generators 15 and 16 break down the intermolecular force by the action of ultrasonic vibration and dissolve the agglomerated particles G2 containing the metal foreign matter L into single particles of lithium manganate primary particles S and impurity particles L. It is for crushing (decomposing). Of course, the aggregated particles G1 in which the primary particles S of the lithium manganate aggregate due to the action of ultrasonic vibration are crushed (decomposed) into the single particles of the primary particles S of the lithium manganate.

  Here, the reason for adopting the ultrasonic generator is as follows. That is, since the particle size distribution of primary particles of lithium manganate greatly affects battery performance (particularly capacity), it is not possible to use a technique in which the primary particles are pulverized to change (decrease) the particle size. Therefore, it is considered that crushing (decomposition) by ultrasonic waves is the best as a technique that works effectively on primary particles having a particle size of 5 to 40 μm and does not crush the primary particles.

  The reason why the second ultrasonic generator 16 is provided near the discharge port 5a is to cope with the case where the cylindrical material supply unit 5 is long in the axial direction. That is, even if the aggregated particles S1 and S2 are all decomposed into single particles of lithium manganate primary particles S and metallic foreign matter L by the first ultrasonic generator 15, the screw 6 leads to the discharge port 5a. While being carried, the aggregated particles S1 and S2 may be formed again. Therefore, the agglomerated particles S1 and S2 that will be formed again after passing through the first ultrasonic generator 15 are subjected to a vibrating action by the second ultrasonic generator 16 to be crushed (decomposed) again. It is.

  The ultrasonic frequency of the ultrasonic generators 15 and 16 is set to a frequency that gives a vibration action (resonance) to the particle diameter of the primary particles of lithium manganate.

  In this manner, the aggregated particles G1 and G2 are irradiated with ultrasonic waves by the ultrasonic generators 15 and 16, so that the aggregated particles G1 are converted into single particles of the primary particles S and the aggregated particles G2 are converted into the primary particles S. The metal foreign matter L can be efficiently crushed (decomposed) into single particles. That is, the screw feeder 2 and the ultrasonic generators 15 and 16 constitute an agglomerated particle decomposition apparatus.

In the general formula,
Frequency = Sound speed / Primary particle size (1)
Therefore, when the relationship is close to this equation, the intermolecular force (the intermolecular force between the primary particle S and the primary particle S and the intermolecular force between the primary particle S and the metal foreign matter L) is efficiently obtained by resonance. Can be destroyed well.

In the comparative example , the ultrasonic generator has been described. However, the present invention is not limited to this, and examples of a method for applying vibration to primary particles of lithium manganate include a vibrator.

  The primary particles S crushed into single particles by the ultrasonic generators 15 and 16 and the metal foreign matter L similarly crushed into single particles are shown in FIG. Thus, it falls into a wide space inside the separation mechanism portion 8 (impurity separation portion). At this time, the aggregated particles G1 and G2 do not exist in the electrode material falling.

  The separation mechanism unit 8 includes an air jet 9 immediately below the discharge port 5a. The air jet 9 is for generating an air stream that stirs the single particles of the primary particles S and the metal foreign matter L supplied into the separation mechanism section 8. By the stirring by the air jet 9, the primary particles S that are single particles drift upward vertically as shown by an arrow E in FIG. On the other hand, the metallic foreign matter L that is a single particle falls vertically downward by its own weight as indicated by an arrow F in FIG.

  A classification rotor 10 is provided on the upper part of the separation mechanism unit 8. Of the electrode materials (powder, powder) charged into the separation mechanism 8, the primary particles S of lithium manganate, which is a fine powder having a specified particle diameter, are classified by the classifying rotor 10 and taken out through the discharge pipe 12. . This extracted electrode material is only the primary particles S of lithium manganate and does not contain the metal foreign matter L. Reference numeral 11 denotes an inverter-equipped motor that can manage the rotational speed of the classification rotor 10 while rotating it.

  A conical portion 8 b that narrows vertically downward is provided in the vertical lower portion of the separation mechanism portion 8. The metallic foreign matter L in a single particle state falling vertically downward accumulates in the conical portion 8b, slides on the inner wall surface of the conical portion 8b, and further falls vertically downward. The material falling down vertically does not contain the primary particles S of lithium manganate.

  A rotary valve 13 is provided in a cylindrical connecting portion 8c connected to the conical portion 8b. The metallic foreign matter L that falls and is stored in the connecting portion 8c is recovered by the contamination recovery portion 14 as contamination by opening the rotary valve 13.

Here, the effect of the comparative example will be described.

According to the comparative example , the ultrasonic generators 15 and 16 (ultrasound generating means) are provided, and the ultrasonic waves generated by the ultrasonic generators 15 and 16 are converted into primary particles S of lithium manganate (active material) and metal foreign matter. It acts on the agglomerated particles G2 containing L (impurity particles). The ultrasonic waves resonate with the primary particles S of lithium manganate forming the aggregated particles G2, so that the intermolecular force between the primary particles S of the lithium manganate and the metal foreign matter L is divided, and the aggregated particles G2 are primary. The particles S and the metal foreign matter L can be crushed (decomposed) into single particles. By reusing the single particles of the lithium manganate primary particles S thus crushed, the utilization rate of lithium manganate can be increased.

Further, according to the comparative example , the case 3 has a material input port 4a at one end and a discharge port 5a at the other end of the case 3, and the lithium manganate (active material) from the material input port 4a toward the discharge port 5a. The screw feeder 2 (conveying means) that conveys the aggregated particles G2 in the case 3 including the primary particles S and the metal foreign matter L (impurity particles), and ultrasonic waves act on the aggregated particles G2 that are conveyed by the screw feeder 2 And the ultrasonic generators 15 and 16 (ultrasonic wave generating means) for decomposing the aggregated particles G2 into primary particles S and single particles of the metal foreign matter L, so that the aggregated particles are selected according to the conveying speed of the screw feeder 2. G2 can be crushed (decomposed) into single particles of primary particles S and metallic foreign matters L one after another.

  If the ultrasonic generators 15 and 16 are used, since the energy more than necessary is not given to the aggregated particles G2, the primary particle S of the lithium manganate is not crushed and the particle size distribution is not changed. .

Further, according to the comparative example , the case 3 has a material input port 4a at one end and a discharge port 5a at the other end of the case 3, and the lithium manganate (active material) from the material input port 4a toward the discharge port 5a. The screw feeder 2 (conveying means) that conveys the aggregated particles G2 in the case 3 including the primary particles S and the metal foreign matter L (impurity particles), and ultrasonic waves act on the aggregated particles G2 that are conveyed by the screw feeder 2 Single particles discharged by the ultrasonic generators 15 and 16 (ultrasonic wave generating means) for crushing (decomposing) the aggregated particles G2 into single particles of the primary particles S and the metal foreign matter L, and the discharge port 5a. A separation mechanism unit 8 (impurity separation unit) that introduces primary particles S of lithium manganate decomposed into single particles and metal foreign matter L decomposed into single particles and contaminates and separates only the metal foreign matter L. Have . In this way, by causing ultrasonic waves to act on the agglomerated particles G2 containing the primary particles S of lithium manganate and the metal foreign matter L, the primary particles S of lithium manganate and the metal foreign matter L are crushed into single particles, Since a mass difference occurs between primary particles S of lithium manganate, which is a single particle, and metallic foreign matter L, which is also a single particle, separation of only the metallic foreign matter L is facilitated, and the yield of lithium manganate is improved. .

Further, according to the comparative example , since the material of the material supply unit 5 (the case where the aggregated particles G2 are conveyed) is a flexible resin, the ultrasonic waves set in the ultrasonic generators 15 and 16 are used. It is possible to prevent the frequency from being changed by the material supply unit 5.

FIG. 2 is a partially enlarged schematic view of the contamination separation apparatus according to the first embodiment of the present invention . Specifically, the material supply unit 5 is shown enlarged. 2 is the same as that shown in FIG. Also in FIG. 2, the same parts as those in FIG.

  The frequency of ultrasonic waves that can be generated by one ultrasonic generator is usually one type. On the other hand, the primary particle size (diameter φ) of lithium manganate is distributed with a certain width of 5 to 40 μm as shown in FIG. In order to generate resonance by applying ultrasonic waves to the entire primary particles of lithium manganate having such a particle size distribution, a plurality of ultrasonic frequencies are required.

Therefore, when dividing the particle size range into three, and examining the ultrasonic frequency that can resonate the primary particles of lithium manganate in the three divided particle size ranges,
First particle size range (φ is 1 to 10 μm): frequency 68 kHz
Second particle size range (φ is 11 to 20 μm): frequency 31 kHz
Third particle size range (φ is 21 μm or more): Frequency 14 kHz
It became like this.

In response to this result, in the first embodiment, the three ultrasonic generators 21, 22, and 23 having different ultrasonic frequencies are moved from the upstream side in the conveying direction in the material supply unit 5 as shown in FIG. It is provided in order toward the downstream side. That is, the first ultrasonic generator 21 having an ultrasonic frequency of 68 kHz is disposed upstream of the material supply unit 5 in the transport direction (the outlet of the material storage unit 4), and the second ultrasonic generator 22 having an ultrasonic frequency of 31 kHz is provided. In the center of the material supply unit 5, a third ultrasonic generator 23 having an ultrasonic frequency of 14 kHz is provided downstream in the transport direction of the material supply unit 5 (inlet of the separation mechanism unit 8).

  Then, ultrasonic waves of three different frequencies are irradiated to the primary particles of lithium manganate and the aggregated particles containing the metal foreign matter at a time interval. As described above, the ultrasonic waves having different frequencies are irradiated to the aggregated particles with time for the following reason. In other words, when ultrasonic waves of different frequencies are irradiated simultaneously on the aggregated particles, the vibrations of the particles generated by the irradiation of ultrasonic waves of each frequency cancel each other, and the intermolecular relationship between the primary particles of lithium manganate and the metal foreign matter This is to avoid a situation where power cannot be divided.

Here, the function and effect of the first embodiment will be described.

  Now, primary particles of lithium manganate belonging to the first particle size range belong to the first particle S1, lithium manganate primary particles belonging to the second particle size range belong to the second particle S2, and third particle size range. The primary particles of lithium manganate are referred to as third particles S3, and the particle size is gradually increased from the first particles S1 to the third particles S3. Assume that the aggregated particles G3 are formed in the material reservoir 4 as shown in FIG. 2 by these three kinds of particles S1, S2, S3 and the metal foreign matter L inside the material reservoir 4.

  FIG. 2 also shows a state in which the aggregated particles G3 containing the metal foreign matter L are decomposed stepwise by the three ultrasonic generators 21 to 23. That is, when the agglomerated particles G3 containing the metallic foreign matter L pass through the first ultrasonic generator 21 in FIG. 2 while being conveyed to the discharge port 5a by the screw 6, the frequency is 68 kHz with respect to the agglomerated particles G3. The ultrasonic wave is irradiated. Then, only the first particles S1 are crushed (decomposed) from the aggregated particles G3, and the first particles S1 are separated from the aggregated particles G3 to become single particles. Since the second particles S2 and the third particles S3 do not vibrate by the first ultrasonic generator 21, the aggregated particles G3 'formed from the second particles S2, the third particles S3, and the metal foreign matter L remain. The aggregated particles G <b> 3 ′ are conveyed by the screw 6 as it is downstream in the conveying direction of the first ultrasonic generator 21 (to the right in the drawing).

  Subsequently, when the aggregated particles G3 'pass through the second ultrasonic generator 22 in FIG. 2, the aggregated particles G3' are irradiated with ultrasonic waves having a frequency of 31 kHz. Then, only the second particles S2 are now crushed from the aggregated particles G3 ', and the second particles S2 are separated from the aggregated particles G3' and become single particles. Since the third particle S3 is not vibrated by the second ultrasonic generator 22, the agglomerated particles G3 ″ formed from the third particles S3 and the metal foreign matter L remain. It is conveyed downstream in the conveying direction of the ultrasonic generator 22.

  Finally, when the aggregated particles G3 ″ pass through the third ultrasonic generator 23 in FIG. 2, the aggregated particles G3 ″ are irradiated with ultrasonic waves having a frequency of 14 kHz. Then, the aggregated particles G3 ″ are decomposed into the third particles S3 and the metal foreign matter L, and both the third particles S3 and the metal foreign matter L become single particles.

  Aggregated particles do not remain downstream of the third ultrasonic generator 23 in the conveying direction. That is, after the aggregated particles G3 containing the metal foreign matter L have passed through the third ultrasonic generator 23, the first particles S1, the second particles S2, the third particles S3, and the metal foreign matter that have formed the aggregated particles G3. All L is crushed (decomposed) into single particles.

  Then, the material that has become single particles downstream in the transport direction of the third ultrasonic generator 23 is transported by the screw 6 and put into the separation mechanism section 8. Then, the first, second, and third particles S1, S2, and S3, which are single particles, are drifted vertically upward by stirring by the air jet 9. On the other hand, the metallic foreign matter L that is a single particle falls vertically downward by its own weight.

  The first, second, and third particles S1, S2, and S3 of lithium manganate, which is a fine powder within a specified particle size among the materials (powder, powder) charged into the separation mechanism unit 8, are separated by the classifying rotor 10. Classification and removal through the discharge pipe 12. The extracted electrode material is only primary particles (S1, S2, S3) of lithium manganate and does not contain the metal foreign matter L.

  On the other hand, the metallic foreign matter L in a single particle state falling vertically downward accumulates in the conical portion 8b, slides on the inner wall surface of the conical portion 8b, and further falls vertically downward. The first, second, and third particles S1, S2, and S3 are not included in the material that falls vertically downward. The metallic foreign matter L that falls and is stored in the connection portion 8c is recovered by the contamination recovery portion 14 as contamination by opening the rotary valve 13.

In the first embodiment, three particles are irradiated by irradiating the aggregation particles G3 including the metal foreign matter L with ultrasonic waves of three stages (multistage) at intervals in the transport direction of the material supply unit 5. Aggregated particles containing the metal foreign matter L even when the first, second, and third particles S1, S2, S3 of lithium manganate represented by the diameter and the metal foreign matter L form the aggregated particle G3 G3 can be efficiently crushed (decomposed) into single particles of the first, second, and third particles S1, S2, and S3 and single particles of the metal foreign matter L. As described above, according to the first embodiment, since the ultrasonic wave having a frequency matched to the particle size distribution of the lithium manganate is caused to act on the aggregated particles G3 containing the metal foreign matter L stepwise, a certain size distribution. Even when the metal foreign matter L is mixed in the primary particles (S1, S2, S3) of lithium manganate having a particle to form aggregated particles G3, the decomposition into single particles can be performed reliably. It is.

In the first embodiment, the case where the particle size range of the primary particles of lithium manganate is divided into three has been described, but the number of division is not limited to three. The number of division may be two, or may be divided into four or more.

FIG. 4 is an enlarged schematic view of the material supply unit 5 of the second embodiment. 4 is the same as that of FIG. Also in FIG. 4, the same parts as those in FIG. Although the ultrasonic generators 15 and 16 of FIG. 1 are not shown in FIG. 4, it goes without saying that they are provided in the same manner as FIG. 1.

In the comparative example , the outer periphery of the material supply unit 5 is directly exposed to the outside air. If the temperature of the part where the aggregated particles G2 containing the metal foreign matter L are conveyed, that is, the temperature inside the material supply unit 5 is higher than the outside air, condensation may occur on the inner wall of the material supply unit 5. When condensation occurs, it is considered that the primary particles S and the metal foreign matter L that have been crushed (decomposed) into single particles are aggregated again to form aggregated particles G2.

Therefore, in the second embodiment, the material supply unit 5 (the case where the aggregated particles G2 containing the metal foreign matter L are conveyed) has a double structure of the inner tube 31 and the outer tube 32 as shown in FIG. Aggregated particles G2 containing metal foreign matter L are conveyed by the inner tube 31 to the discharge port 5a with the screw 6, and at least the outside air temperature (in the cylindrical space 33 formed between the inner tube 31 and the outer tube 32). Circulate liquid at a temperature higher than ambient temperature).

  As a result, it is possible to prevent dew condensation from occurring on the inner wall surface 31a of the inner tube 31 to which the aggregated particles G2 containing the metal foreign matter L are conveyed, so that they are crushed by the ultrasonic generators 15 and 16 into single particles. It is possible to prevent the primary particles S and the metal foreign matters L from aggregating again to form aggregated particles G2.

In each of the two embodiments, the case where the active material (electrode material) is lithium manganate has been described. However, the active material targeted by the present invention is not limited to lithium manganate.

1 Contamination separator 2 Screw feeder (conveying means)
3 Case 4 Material storage 4a Material input 5 Material supply 5a Discharge 8 Separation mechanism (impurity separation)
15, 16 Ultrasonic generator (Ultrasonic generator)
21, 22, 23 Ultrasonic generator (Ultrasonic generator)
31 Inner pipe 32 Outer pipe

Claims (3)

Conveying means having a material inlet at one end of the case and an outlet at the other end of the case, and conveying aggregated particles in the case containing primary particles and impurity particles from the material inlet to the outlet. When,
Ultrasonic generation means for degrading the agglomerated particles into single particles by stepwise applying ultrasonic waves matched to the particle size distribution of the active material material to the agglomerated particles conveyed by the conveying means;
An impurity separation unit that introduces primary particles of active material decomposed into single particles and impurity particles decomposed into single particles discharged from the discharge port, and contaminates and separates only the impurity particles; Contamination separator characterized by that. While arranging the ultrasonic generating means in the case of the part where the aggregated particles are conveyed, the case of the part where the aggregated particles are conveyed has a double structure of an inner tube and an outer tube,
The contamination separation apparatus according to claim 1 , wherein the aggregated particles are conveyed by an inner pipe and a liquid having a temperature higher than at least the ambient temperature is circulated between the inner pipe and the outer pipe. The contamination separation apparatus according to claim 1 or 2 , wherein a material of a case at a portion where the aggregated particles are conveyed is a resin having flexibility.

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