JP5726478B2 - Classification method and classification tube - Google Patents

Classification method and classification tube Download PDF

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JP5726478B2
JP5726478B2 JP2010224824A JP2010224824A JP5726478B2 JP 5726478 B2 JP5726478 B2 JP 5726478B2 JP 2010224824 A JP2010224824 A JP 2010224824A JP 2010224824 A JP2010224824 A JP 2010224824A JP 5726478 B2 JP5726478 B2 JP 5726478B2
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tube
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tank
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志雄 游
志雄 游
智佳子 橋本
智佳子 橋本
梅原　洋一
洋一 梅原
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Chiyoda Corp
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Description

本発明は、セラミックスの多孔質体や樹脂及びその多孔質体等の粒状物質を湿式で分級するための分級方法およびこれに使用する分級管に関する。   The present invention relates to a classification method for wet classification of a porous material or resin of ceramics and particulate materials such as the porous material, and a classification tube used therefor.

粉砕または合成により製造されたセラミックスの多孔質体や樹脂及びその多孔質体等の粒状物質は、広い粒子径分布を有している。微細な粒子が混在していると、セラミックスの多孔質体や樹脂及びその多孔質体等を利用するプロセスにおいて、微細粒子によるフィルターの閉塞等の問題を生ずる。微細粒子を除去する方法としては、一般的に篩が使用されるが、篩は目詰まりを起こすために効率的な除去を行うことができない。   Ceramic porous bodies and resins produced by pulverization or synthesis and particulate substances such as porous bodies have a wide particle size distribution. When fine particles are mixed, problems such as clogging of the filter with fine particles occur in a process using a ceramic porous body, a resin, and the porous body. As a method for removing fine particles, a sieve is generally used. However, since the sieve is clogged, it cannot be efficiently removed.

そこで、分級対象粒子を入れた分級槽の底部から水を供給して上昇流をつくり、沈降速度差を利用して分級する水力分級法が有効である。しかし、従来の水力分級法では、特別な構造を有する大きな分級槽や大流量のポンプを必要とし、また、密度の小さな粒子の微細粒子のみを分離する場合には液流速が小さいため、分級槽底部に滞留部ができて分級の効率が低下してしまう、といった問題があった（特許文献１〜３）。   Therefore, a hydraulic classification method is effective in which water is supplied from the bottom of the classification tank containing the classification target particles to create an upward flow, and classification is performed using the difference in sedimentation speed. However, the conventional hydraulic classification method requires a large classification tank having a special structure and a pump with a large flow rate, and the liquid flow rate is small when only fine particles of small density particles are separated. There was a problem that a retention part was formed at the bottom and classification efficiency was lowered (Patent Documents 1 to 3).

特開２０００−３０１０２２号公報JP 2000-301022 A 特開２００１−８７６７３号公報JP 2001-87673 A 特開２００４−１１３９６２号公報Japanese Patent Application Laid-Open No. 2004-113962

本発明は、上述の問題に鑑みてなされたものであり、特別な構造の大型分級槽を必要とせず、効率的で低コストの分級方法を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object thereof is to provide an efficient and low-cost classification method without requiring a large-sized classification tank having a special structure.

上記課題を解決する本発明の分級方法は、分級対象粒子を液媒体とともに分級槽に加え、これを攪拌して分級液を調製し、前記分級槽内の前記分級液内に液流入口が該分級液と連通するように分級管を挿入し、前記分級槽内の攪拌を継続しながら前記分級管の液流出口から前記分級液を吸引することにより、前記分級液を前記分級管内を通過させて微細粒子を除去することを特徴とする。
本発明の分級方法に使用する分級管には、管内液流入側に少なくとも１枚のバッフルを設けることが好ましい。また、本発明の分級方法に使用する分級管には、管内液流出側に少なくとも１つのリブを設けることが好ましい。 In the classification method of the present invention that solves the above-mentioned problems, the particles to be classified are added to a classification tank together with a liquid medium, and this is stirred to prepare a classification liquid, and a liquid inlet is provided in the classification liquid in the classification tank. A classification tube is inserted so as to communicate with the classification liquid, and the classification liquid is sucked from the liquid outlet of the classification pipe while continuing the stirring in the classification tank, thereby allowing the classification liquid to pass through the classification pipe. And removing fine particles.
The classification tube used in the classification method of the present invention is preferably provided with at least one baffle on the liquid inflow side. Moreover, it is preferable to provide at least one rib on the liquid outflow side in the classification tube used in the classification method of the present invention.

本発明の分級方法によれば、セラミックスの多孔質体や樹脂及びその多孔質体等の粒状物質の分級を、特別な構造の大型分級槽や大流量のポンプを必要とすることなく、高効率かつ低コストで行うことが可能となる。   According to the classification method of the present invention, it is possible to classify a porous material of ceramic, a resin, and a granular material such as the porous material without the need for a large-sized classification tank having a special structure or a pump having a large flow rate. In addition, it can be performed at low cost.

本発明の分級方法を実施するための装置の例である。It is an example of the apparatus for enforcing the classification method of this invention. 本発明の分級方法に用いる分級管の例である。It is an example of the classification tube used for the classification method of this invention. 本発明の分級方法を実施するための装置の別の例である。It is another example of the apparatus for enforcing the classification method of this invention. 本発明の分級方法により微粒子の除去を行った例の処理時間と粒子除去率の関係を示す図である。It is a figure which shows the relationship between the processing time and the particle removal rate of the example which removed the microparticles | fine-particles by the classification method of this invention.

本発明の分級方法は、分級対象粒子を液媒体とともに分級槽に加え、これを攪拌して分級液を調製し、前記分級槽内の前記分級液内に液流入口が該分級液と連通するように分級管を挿入し、前記分級槽内の攪拌を継続しながら前記分級管の液流出口から前記分級液を吸引することにより、前記分級液を前記分級管内を通過させて微細粒子を除去することを特徴とする。本発明の分級方法では、分級槽内で攪拌混合されている分級液を、該分級液中に挿入した分級管の一方を吸入することで分級処理を行うので、高い分級効率が得られる。また、特別な構造の大きな分級槽を必要とせず、既存の攪拌槽を利用することができる。   In the classification method of the present invention, classification target particles are added to a classification tank together with a liquid medium, and this is stirred to prepare a classification liquid, and a liquid inlet communicates with the classification liquid in the classification liquid in the classification tank. In such a manner, the classification liquid is sucked from the liquid outlet of the classification pipe while continuing the stirring in the classification tank so that the fine particles are removed by passing the classification liquid through the classification pipe. It is characterized by doing. In the classification method of the present invention, the classification liquid is stirred and mixed in the classification tank, and classification is performed by inhaling one of the classification tubes inserted into the classification liquid, so that high classification efficiency is obtained. Moreover, an existing stirring tank can be used without requiring a large classification tank having a special structure.

以下、本発明の分級方法を図面も参照してさらに詳細に説明する。
本発明の分級方法は、液媒体（一般的には水が使用される）に溶解せず、液媒体よりも密度が大きい粒子であれば、粒子の形状に拠らず適用できるが、特に通常の水力分級では比較的困難な密度が２０００Ｋｇ／ｍ３以下の粒子、例えばセラミックスの多孔質体や樹脂及びその多孔質体等の粒状物質に好適に用いることができる。本発明の分級方法によって分級可能な分級対象粒子の粒径は、粒子密度、液媒体密度、ポンプ性能等によって変わりえるが、数μｍから数百μｍ程度の粒径のものを分級することができる。 Hereinafter, the classification method of the present invention will be described in more detail with reference to the drawings.
The classification method of the present invention can be applied regardless of the shape of the particles as long as the particles do not dissolve in the liquid medium (generally water is used) and the density is higher than that of the liquid medium. Can be suitably used for particles having a density of 2000 Kg / m 3 or less, such as ceramic porous bodies and resins, and particulate materials such as porous bodies, which is relatively difficult to perform by the hydraulic classification. The particle size of the particles to be classified that can be classified by the classification method of the present invention can vary depending on the particle density, liquid medium density, pump performance, etc., but particles having a particle size of about several μm to several hundred μm can be classified. .

図１は、本発明の分級方法を実施するための装置の例の概要を示したものである。
本発明の分級方法に用いる分級槽１は、分級対象粒子と液媒体とからなる分級液２を、攪拌機３等を用いて攪拌することができればよく、特別な構造を必要としない。既存の攪拌槽を利用してもよい。 FIG. 1 shows an outline of an example of an apparatus for carrying out the classification method of the present invention.
The classification tank 1 used in the classification method of the present invention only needs to be able to stir the classification liquid 2 composed of the classification target particles and the liquid medium using the stirrer 3 and the like, and does not require a special structure. An existing stirring tank may be used.

攪拌機３は、粒子を浮遊させることができる攪拌翼を有するものであればよく、攪拌機３の攪拌翼としては、プロペラ、傾斜パドル、タービン、ファドラー、アンカー型等が挙げられる。   The stirrer 3 only needs to have a stirring blade capable of floating particles, and examples of the stirring blade of the stirrer 3 include a propeller, an inclined paddle, a turbine, a fiddler, and an anchor type.

本発明の分級方法に用いる分級管４の一例の詳細を図２に示した。分級管４は、図２の（ａ）に示すように、分級液が、液流入口２１から液流出口２２へと上方に向かって通過できるようになっている。分級管４の形状は、均一な流れを形成するためには円柱状のものが好ましいが、四角柱状や三角柱状のものであってもよい。分級管４の液流出口部は、流れが乱れないように少なくとも絞り角９０°以下の円錐状となっていることが好ましい。分級管４の径は、分級槽１に挿入することができ、ポンプ吸引量に制約が無ければ大きいほど短時間で分級がおこなえるが、好適には５０ｍｍ〜１０００ｍｍ程度が用いられる。分級管４の長さは、径の２倍〜１０倍であることが好ましい。短すぎると均一な流れの形成が難しくなり、十分な分級効果が得られない。また、長すぎると分級管の重量が増加し、保持が難しくなる問題がある。好適には径の２．５倍〜６倍程度である。   Details of an example of the classification tube 4 used in the classification method of the present invention are shown in FIG. As shown in FIG. 2A, the classification tube 4 is configured so that the classification liquid can pass upward from the liquid inlet 21 to the liquid outlet 22. The shape of the classification tube 4 is preferably a cylindrical shape in order to form a uniform flow, but may be a quadrangular prism shape or a triangular prism shape. It is preferable that the liquid outlet port of the classification tube 4 has a conical shape with a narrowing angle of 90 ° or less so that the flow is not disturbed. The diameter of the classification tube 4 can be inserted into the classification tank 1, and the classification can be performed in a shorter time as the pump suction amount is not restricted. However, about 50 mm to 1000 mm is preferably used. The length of the classification tube 4 is preferably 2 to 10 times the diameter. If it is too short, it is difficult to form a uniform flow, and a sufficient classification effect cannot be obtained. Moreover, when too long, the weight of a classification tube will increase and there exists a problem which becomes difficult to hold | maintain. Preferably, it is about 2.5 to 6 times the diameter.

本発明の分級管には、下部の液流入口部側内壁にバッフル２３を設けることが好ましい。バッフル２３を設けることにより、分級槽の攪拌による液流れの影響を受けることがなくなり、攪拌条件の制約が無くなる。バッフル２３は、例えば図２の（ｂ）に示すように、均等に４枚設けることができる。バッフル２３の幅は、分級管４の径の１／１０以上が好ましく、バッフル２３の長さは、分級管４の長さの１／２０以上が好ましい。   The classifying pipe of the present invention is preferably provided with a baffle 23 on the inner wall on the side of the lower liquid inlet. By providing the baffle 23, there is no influence of the liquid flow due to the stirring of the classification tank, and the restriction of the stirring conditions is eliminated. For example, four baffles 23 can be provided equally as shown in FIG. The width of the baffle 23 is preferably 1/10 or more of the diameter of the classification tube 4, and the length of the baffle 23 is preferably 1/20 or more of the length of the classification tube 4.

また、本発明の分級管には、上部の液流出口部側内壁に、例えば図２の（ｃ）に示すようなリブ２４を設けることが好ましい。分級管内壁付近では液流れがほぼ無いため、粒子は壁面付近を下降していき分級効率が低下するが、リブ２４を設けることにより、下降する粒子を液流れのある領域まで導き、分級効率を向上させることができる。リブ２４の高さは、１〜１０ｍｍ程度であることが好ましい。   Moreover, it is preferable that the classifying pipe of the present invention is provided with a rib 24 as shown in FIG. Since there is almost no liquid flow near the inner wall of the classification tube, the particles descend around the wall surface and the classification efficiency decreases. However, by providing the rib 24, the particles that descend are guided to a region where the liquid flow is present, and the classification efficiency is improved. Can be improved. The height of the rib 24 is preferably about 1 to 10 mm.

次に本発明の分級方法の手順を説明する。
まず、広い粒子径分布を有する分級対象粒子を液媒体とともに分級槽１に加え、これを攪拌してスラリー状の分級液２を調製する。次いで、分級槽１の攪拌を行いながら、分級管４の液流入口２１が分級槽１内の分級液２と連通するように鉛直方向に向けて挿入する。この際の分級管４の挿入位置は、横方向については、攪拌翼に接触せず、分級槽１の壁面に接触しない範囲で任意に設定することができる。また、縦方向については、分級槽１の底部に接触せず、液流入口２１から空気を巻き込まない範囲で任意に設定することができるが、攪拌翼からなるべく離したほうが攪拌翼による液流れの影響を受けにくいので好ましい。そして、ポンプ５により、分級管４の液流出口２２から、分級管内が整流化された液速度となるような一定速度で分級液２を吸引する。ここでの一定速度とは、ストークスの式から求められる、分離したい粒子径の粒子を分離できる液流速である。吸引速度は、流量計６等を用いて調整することができる。このようにして、分級管４から吸引して除かれた微粒子は、フィルター７に送られてここで濾取され、濾液は再度分級槽１に供給される。このような分級操作を所定時間おこなう。なお、微粒子の除去は、図３に示すように、分離槽８を用いて行うこともできる。また、複数の分級管を使用して分級処理をおこなってもよい。 Next, the procedure of the classification method of the present invention will be described.
First, the classification target particles having a wide particle size distribution are added to the classification tank 1 together with the liquid medium, and this is stirred to prepare a slurry-like classification liquid 2. Next, while stirring the classification tank 1, the liquid inlet 21 of the classification pipe 4 is inserted in the vertical direction so as to communicate with the classification liquid 2 in the classification tank 1. The insertion position of the classification tube 4 at this time can be arbitrarily set in a range that does not contact the stirring blade and does not contact the wall surface of the classification tank 1 in the lateral direction. Further, the vertical direction can be arbitrarily set within a range in which air does not get in from the liquid inlet 21 without contacting the bottom of the classification tank 1, but the liquid flow caused by the stirring blades should be as far as possible from the stirring blades. It is preferable because it is not easily affected. Then, the classification liquid 2 is sucked from the liquid outlet 22 of the classification pipe 4 by the pump 5 at a constant speed so that the liquid speed in the classification pipe is rectified. Here, the constant speed is a liquid flow rate obtained from the Stokes equation, which can separate particles having a particle diameter to be separated. The suction speed can be adjusted using the flow meter 6 or the like. The fine particles sucked and removed from the classification tube 4 in this way are sent to the filter 7 where they are collected by filtration, and the filtrate is supplied to the classification tank 1 again. Such classification operation is performed for a predetermined time. The removal of the fine particles can also be performed using a separation tank 8 as shown in FIG. In addition, classification processing may be performed using a plurality of classification tubes.

以下、本発明の分級方法を、実施例により更に詳細に説明するが、本発明はこれらに限定されるものではない。   Hereinafter, although the classification method of this invention is demonstrated in detail by an Example, this invention is not limited to these.

実施例１
４−ビニルピリジンとジビニルベンゼンとのコポリマー（密度１１００Ｋｇ／ｍ３）を懸濁重合により合成した。得られた樹脂ビーズの粒径をレーザ回折／散乱式粒子径分布測定装置で測定した結果、粒径２００μｍ未満の粒子が約３ｖｏｌ％、粒径２６２μｍ未満の粒子が約１６ｖｏｌ％含まれていた（平均粒径４００μｍ）。この樹脂ビーズの分級処理を図１に示す装置を用いて以下のようにおこなった。 Example 1
A copolymer of 4-vinylpyridine and divinylbenzene (density 1100 Kg / m 3 ) was synthesized by suspension polymerization. As a result of measuring the particle size of the obtained resin beads with a laser diffraction / scattering particle size distribution measuring device, the particle size was less than 200 μm and contained about 3 vol% and less than 262 μm particle size about 16 vol% ( (Average particle size 400 μm). The resin beads were classified as follows using the apparatus shown in FIG.

樹脂ビーズ２０Ｌと水８０Ｌを容量１２０Ｌの円柱状の分級槽（５７０Φ×７００ｍｍＨ）に入れ、アンカー型攪拌機（「スリーワンモーター」、翼径１５０ｍｍ）で攪拌して、分級液を調製した。この分級槽に、図２に示すような形状の１００ｍｍΦ×５００ｍｍＨの分級管（液流入口部に幅２０ｍｍ、高さ１００ｍｍのバッフルを４枚及び液流入口から３００ｍｍの位置に高さ１．５ｍｍの半円状のリブを設置）を、液流入口が分級液と連通するように分級槽中心部から１８０ｍｍ、分級槽底部から１９５ｍｍの位置に挿入し、１００ｒｐｍで攪拌を継続しながら、液流出口からポンプで１２０Ｌ／ｈの流量（液流速０．００４２５ｍ／ｓ）で吸引した。吸引した分級液はカートリッジフィルター（濾過精度１０μｍ）に通して含まれる粒子を除去し、濾液を再度分級槽に供給するようにした。   20 L of resin beads and 80 L of water were placed in a cylindrical classification tank (570Φ × 700 mmH) having a capacity of 120 L and stirred with an anchor type stirrer (“Three-One Motor”, blade diameter 150 mm) to prepare a classification solution. In this classification tank, a 100 mmΦ × 500 mmH classification tube having a shape as shown in FIG. 2 (four baffles with a width of 20 mm and a height of 100 mm at the liquid inlet and a height of 1.5 mm at a position 300 mm from the liquid inlet. Is inserted into the position of 180 mm from the center of the classification tank and 195 mm from the bottom of the classification tank so that the liquid inlet communicates with the classification liquid, and the liquid flow is continued while stirring at 100 rpm. Suction was performed from the outlet by a pump at a flow rate of 120 L / h (liquid flow rate: 0.00425 m / s). The sucked classification liquid was passed through a cartridge filter (filtration accuracy: 10 μm) to remove contained particles, and the filtrate was again supplied to the classification tank.

上記の分級処理を行いながら、３０分ごとに分級槽から樹脂を採取し、粒径分布を測定した。処理時間と粒径２００μｍ未満の粒子の除去率の関係を図４に示した。処理時間２時間で除去率は９８％以上（粒径２００μｍ未満の粒子の含有率が０．０５ｖｏｌ％未満）となり、２．５時間経過後には検出されなくなった。このときの粒子歩留まりは８０％であった。   While performing the above classification treatment, the resin was collected from the classification tank every 30 minutes, and the particle size distribution was measured. FIG. 4 shows the relationship between the treatment time and the removal rate of particles having a particle diameter of less than 200 μm. With a treatment time of 2 hours, the removal rate was 98% or more (the content rate of particles having a particle size of less than 200 μm was less than 0.05 vol%), and was not detected after 2.5 hours. The particle yield at this time was 80%.

実施例２
分級管にリブを設けなかった以外は、実施例１と同じ条件で分級処理を実施したところ、粒径２００μｍ未満の粒子は３．０時間後に検出されなくなった。このときの粒子歩留まりは７５％であった。 Example 2
When the classification treatment was performed under the same conditions as in Example 1 except that the classification tube was not provided with ribs, particles having a particle size of less than 200 μm were not detected after 3.0 hours. The particle yield at this time was 75%.

実施例３
分級管にリブ及びバッフルを設けなかった以外は、実施例１と同じ条件で分級処理を実施したところ、粒径２００μｍ未満の粒子は６．０時間後に検出されなくなった。このときの粒子歩留まりは５０％であった。 Example 3
When the classification treatment was performed under the same conditions as in Example 1 except that the classification tube was not provided with ribs and baffles, particles with a particle size of less than 200 μm were not detected after 6.0 hours. The particle yield at this time was 50%.

本発明の分級方法によれば、セラミックスの多孔質体や樹脂及びその多孔質体等をはじめとするあらゆる粒状物質の分級を、特別な構造の大型分級槽や大流量のポンプを必要とすることなく、高効率かつ低コストで行うことが可能である。   According to the classification method of the present invention, it is necessary to classify any particulate matter including ceramic porous bodies and resins and porous bodies thereof, and to require a large-sized classification tank having a special structure and a pump with a large flow rate. It is possible to carry out with high efficiency and low cost.

１ 分級槽
２ 分級液
３ 攪拌機
４ 分級管
５ ポンプ
６ 流量計
７ フィルター
８ 分離槽
２１ 液流入口
２２ 液流出口
２３ バッフル
２４ リブ 1 Classification tank 2 Classification liquid 3 Stirrer 4 Classification pipe 5 Pump 6 Flow meter 7 Filter 8 Separation tank 21 Liquid inlet 22 Liquid outlet 23 Baffle 24 Rib

Claims (8)

分級対象粒子を液媒体とともに分級槽に加え、これを攪拌して分級液を調製し、前記分級槽内の前記分級液内に液流入口が該分級液と連通するように、液流出口部が円錐状となっている円柱状の分級管を挿入し、前記分級槽内の攪拌を継続しながら前記分級管の液流出口から前記分級液を吸引することにより、前記液流入口から前記液流出口へと上方に向かって前記分級液を前記分級管内を通過させて微細粒子を除去する分級方法であって、
前記分級管が、該分級管の液流入口部に均等に設けられた複数枚のバッフルと該バッフルよりも上部に設けられた少なくとも１つの半円状のリブとを有することを特徴とする分級方法。 The particles to be classified are added to the classification tank together with the liquid medium, and this is stirred to prepare a classification liquid, and the liquid outlet is connected to the classification liquid in the classification tank so that the liquid inlet communicates with the classification liquid. A cylindrical classification tube having a conical shape is inserted and the classification liquid is sucked from the liquid outlet of the classification pipe while continuing the stirring in the classification tank, so that the liquid is introduced from the liquid inlet. the classification liquid upwardly into the outlet a classifying way to remove fine particles is passed through the classification pipe,
The classifying tube has a plurality of baffles provided evenly at the liquid inlet of the classifying tube and at least one semicircular rib provided above the baffle. Way . 前記分級液の吸引を、ストークスの式から求められる分離したい粒子径の粒子を分離できる一定速度で行うことを特徴とする請求項１に記載の分級方法。   2. The classification method according to claim 1, wherein the classification liquid is sucked at a constant speed capable of separating particles having a particle diameter desired to be separated, which is obtained from a Stokes equation. 前記分級対象粒子がセラミックスの多孔質体または樹脂もしくはその多孔質体の粒状物質であることを特徴とする請求項１または２に記載の分級方法。   The classification method according to claim 1 or 2, wherein the classification target particles are a ceramic porous body, a resin, or a granular material of the porous body. 前記分級対象粒子の密度が２０００Ｋｇ／ｍ３以下あることを特徴とする請求項１〜３のいずれか一項に記載の分級方法。 Classification method according to any one of claims 1 to 3 density of the classification target particles wherein there 2,000 Kg / m 3 or less. 前記液媒体が水であることを特徴とする請求項１〜４のいずれか一項に記載の分級方法。   The classification method according to claim 1, wherein the liquid medium is water. 前記分級管を複数使用することを特徴とする請求項１〜５のいずれか一項に記載の分級方法。   The classification method according to any one of claims 1 to 5, wherein a plurality of the classification tubes are used. 請求項１〜６のいずれか一項に記載の分級方法に使用する分級管であって、液流出口部が円錐状となっている円柱状の形状を有し、液流入口部に均等に設けられた複数枚のバッフルと該バッフルよりも上部に設けられた少なくとも１つの半円状のリブとを有し、前記バッフルは、幅が分級管直径の１／１０以上であり、長さが分級管長さの１／２０以上であることを特徴とする分級管。 It is a classification tube used for the classification method as described in any one of Claims 1-6, Comprising: It has the column-shaped shape where the liquid outlet part becomes a cone shape, and is equal to a liquid inlet part. A plurality of baffles provided and at least one semicircular rib provided above the baffle, the baffle having a width of 1/10 or more of the diameter of the classification tube and a length of classifying tube, wherein the at least 1/20 der Turkey classifying tube length. 請求項１〜６のいずれか一項に記載の分級方法に使用する分級管であって、液流出口部が円錐状となっている円柱状の形状を有し、液流入口部に均等に設けられた複数枚のバッフルと該バッフルよりも上部に設けられた少なくとも１つの半円状のリブとを有し、前記リブは、高さが１〜１０ｍｍであることを特徴とする分級管。 It is a classification tube used for the classification method as described in any one of Claims 1-6, Comprising: It has the column-shaped shape where the liquid outlet part becomes a cone shape, and is equal to a liquid inlet part. provided having a plurality of baffles and at least one semi-circular rib provided on the upper portion than the baffle, the rib is classified tube height, characterized in that a 1 to 10 mm.
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