JP4263447B2

JP4263447B2 - Medium stirring type crusher

Info

Publication number: JP4263447B2
Application number: JP2002271330A
Authority: JP
Inventors: 豊彦権藤; 道治藤; 利博石井
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-18
Filing date: 2002-09-18
Publication date: 2009-05-13
Anticipated expiration: 2022-09-18
Also published as: JP2004105844A

Description

【０００１】
【発明の属する技術分野】
本発明は、攪拌部材が取り付けられた攪拌軸を備えるベッセル内に粉砕用固形媒体を充填し、被処理物である固形粒子を含むスラリーを該ベッセル内に導入して攪拌軸を回転させながら固形粒子の粉砕を行う媒体攪拌型粉砕装置に関する。特に本発明は、限定する意味ではないが、鉱物、顔料、染料、化成品、フェライト、セラミック、金属などを微細に粉砕し、或いは、これら材料の微粒子を分散して、塗料、印刷インク、顔料、磁性塗料、ゴム、接着剤、化粧品、塗り薬のような医薬品などを調整する目的に使用される媒体攪拌型粉砕装置に関する。
【０００２】
【従来の技術】
従来のこの種の媒体攪拌型粉砕装置は、図６(a)(b)に示すように、両端が蓋板１０１、１０２により閉じられたシリンダー状のベッセル１０３に同軸に、ピン又は円板１０４等の攪拌部材を有する攪拌軸１０７を設け、ベッセル１０３内にジルコニアビーズ、ガラスビーズ等の粉砕用固形媒体１０５を充填し、該ベッセル１０３内に、一方の蓋板１０２に設けたスラリー導入口１０６から被処理物である固形粒子を含むスラリーを導入し、攪拌軸１０７を回転駆動することによって、粉砕用固形媒体に運動を与え、媒体間を通過するスラリーに媒体間の摩擦によるせん断力を作用させて、固形粒子の粉砕を行うように構成されている。ベッセル１０３の他方の蓋板１０１の近傍には、粉砕用媒体分離機構１１２、１１３により出口スリットが形成され、ベッセル１０３を通過したスラリーは、このスリットを通り、蓋板１０１に設けたスラリー出口１０８から排出される。この装置は、通常は、スラリー導入口１０６から連続的に未処理スラリーを導入し、スラリー出口１０８から連続的に処理済みスラリーを排出するという連続処理に使用される。この連続処理では、スラリーは、必要に応じて何回でも、ベッセル１０３内に循環させることが可能である。この媒体攪拌型粉砕装置は、スラリーに含まれる固形粒子を非常に微細な粒子サイズまで粉砕することができる。ベッセル１０３の外側には冷却剤循環用ジャケット１０９が形成され、冷却剤入口１１０から冷却水等の冷却剤を導入し、冷却剤出口１１１から排出することにより、冷却剤の循環流を生じさせて、ベッセル１０３内部のスラリーの冷却を行うことができる。
【０００３】
ところで、近年では、固形粒子の微細粒子化に対する要求は極めて高くなっており、ナノメーターサイズまでの微細化が求められるようになっている。このような要求に対処するためには、粉砕用固形媒体の大きさを一層小径化することが必要になる。しかし、媒体の径を小さくすると、媒体から被処理物である固形粒子に作用させる粉砕力は、媒体径に逆比例して高めなければならなくなる。そのため、要求される運転動力はその分だけ大きくなり、同時に運転速度も高めなければならなくなる。また、要求される粉砕粒子径を達成するためには、処理時間すなわちベッセル内におけるスラリーの滞留時間も長くなる。これらの条件が重なって、粉砕用固形媒体や攪拌部材が磨耗し易くなり、スラリーのコンタミネーションが増加し、スラリーの温度上昇の問題も生じてくる。
【０００４】
【発明が解決しようとする課題】
本発明は、固形粒子の微細化に対する要求に伴って生じるコンタミネーションの増加、運転動力の増大、及び、スラリー温度の上昇という問題を軽減ないしは解消して、近年特に著しい、一層の固形粒子微細化に対する要求に応え得る媒体攪拌型粉砕装置を提供することを解決すべき課題とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するため、本発明は、媒体攪拌型２軸粉砕装置を提供する。本発明の一態様によれば、２軸粉砕装置は、２つのシリンダーが組み合わされて断面形状が８字形に形成されたダブルシリンダー形状のベッセルと、前記ベッセルの長さ方向両端部にそれぞれ設けられた蓋板と、該ベッセルの８字形を形成する２つのシリンダーのそれぞれの軸心に各１本ずつ配置された２本の攪拌軸と、攪拌軸の各々に軸方向に相互に間隔をもって取り付けられた複数個の攪拌部材と、２本の攪拌軸を互いに反対方向に同一の回転速度で回転するように駆動する駆動手段と、ベッセル内に対し被処理物であるスラリーを導入及び排出するために前記蓋板の少なくとも一方に設けられたスラリー導入口及び排出口と、を備える。ベッセル内には粉砕用固形媒体を充填して攪拌軸を回転駆動しながらスラリーに含まれる固形粒子の粉砕を行う。２本の攪拌軸に取り付けられる複数の攪拌部材は、該攪拌軸の軸方向投影において互いに重なる長さを有し、隣り合った攪拌軸に取り付けられる攪拌部材は回転中に互いに干渉を生じないように配置される。さらに、攪拌軸の各々には、軸方向に離れた複数の位置の各々において、該攪拌軸として２個のほぼ同一形状の上記板状部材が対をなして軸線方向に互いに密接した関係で、かつ、角度方向に６０度から８０度の範囲内の角度で互いにずらされて取り付けられ、２個の前記部材の各対は、他の対に対して軸線方向に間隔をもって配置される。この粉砕装置においては、攪拌部材は、２本の攪拌軸が互いに反対方向に回転駆動されたとき、隣り合った攪拌軸上の攪拌部材が重なり合う領域においてベッセル内の粉砕用固形媒体が密な状態となり、攪拌軸の軸方向にほぼ沿って一方向に動くように強制され、攪拌部材が重なり合う領域とは反対側の領域において疎な状態となり、上記の一方向とは反対方向に動く循環運動を生じさせる形状に構成される。
【０００６】
本発明の別の態様では、攪拌部材の各々は、中心が攪拌軸と同軸で該攪拌軸から放射状に延びるように該攪拌軸に固定された板状部材であり、該板状部材は回転方向前縁部に傾斜面が形成される。この傾斜面により、ベッセル内の粉砕用固形媒体に、上述した一方向の動きが誘起される。本発明のさらに別の態様では、攪拌部材の各々は、中心が攪拌軸と同軸で該攪拌軸から放射状に延びるように該攪拌軸に固定されたほぼ矩形形状の板状部材であり、該矩形形状の板状部材は回転方向前縁部が先端に向かって斜めに切り欠かれた形状であり、この斜めに切り欠かれた部分の縁部には傾斜面が形成される。本発明のこれらの態様において、攪拌部材を構成する板状部材は、各々の攪拌軸の軸方向に離れた複数の位置の各々において、２つのほぼ同一形状の板状部材が、対をなして、かつ、角度方向にずらされて配置される。この場合、対をなす板状部材の角度方向のずれは、６０度から８０度の範囲とする。
【０００７】
さらに、本発明の粉砕装置においては、ベッセルの外周部に熱媒体のためのジャケットを形成することができる。また、攪拌軸の各々には、上述の一方向とは反対側の端部付近に、円板の外周に放射状に突出する複数個のピンを配置したピン型攪拌部材が取り付けることもできる。
【０００８】
本発明の媒体攪拌型粉砕装置を使用してスラリー内の固形粒子の粉砕を行う場合には、２本の攪拌軸を互いに反対方向に同一回転速度で回転駆動し、２本の攪拌軸に取り付けられた攪拌部材が互いに重なり合う領域において粉砕用固形媒体が蜜になる状態を生成させ、該粉砕用固形媒体が攪拌軸の軸方向に沿った一方向に動き、該攪拌部材が互いに重なり合う領域とは反対側の領域において該粉砕用固形媒体が疎になる状態を生成させ、該粉砕用固形媒体が上記一方向とは反対方向に動くようにして、粉砕用固形媒体の循環運動を該粉砕用固形媒体に生じさせる。
【０００９】
このように、本発明による媒体攪拌型粉砕装置においては、攪拌部材を有する２本の攪拌軸が並置され、２本の攪拌軸に取り付けられた攪拌部材が軸方向にみて互いに重なり合う状態で互いに反対方向に回転駆動される。したがって、粉砕用固形媒体は、攪拌部材が軸方向にみて互いに重なり合う領域に密集する傾向を生じる。そして、２本の隣り合う攪拌軸上の攪拌部材は、粉砕用固形媒体を同じ軸方向に推進する作用を生じるように構成されているので、攪拌部材が軸方向にみて互いに重なり合う領域においては、２本の攪拌軸上に設けられた攪拌部材の推進作用が重畳され、この領域では、媒体が攪拌部材の推進作用方向に動かされる。その結果として、この領域以外の領域では、粉砕用固形媒体は疎になり、攪拌部材の推進方向とは反対方向に動かされ、全体としてベッセル内において、媒体の活発な循環運動を生じる。この粉砕用固形媒体の活発な循環運動により、スラリーに含まれる固形粒子に対する粉砕作用が活発になり、媒体の粒径を小さくしなくても、満足な粉砕効果を得ることができる。この媒体の循環運動は、攪拌部材として板状の部材を使用し、該板状の部材を対にして、角度方向にずらして配置することにより、高めることができる。特に、角度方向のすれを６０度から８０度の範囲としたとき、媒体の循環運動は顕著に活発化される。最も好ましいすれ角は６９度±１度である。
【００１０】
また、攪拌軸の各々一端部付近に、円板の外周に放射状に突出する複数個のピンを配置したピン型攪拌部材が取り付けた構成では、板状攪拌部材により生じる粉砕用固形媒体の循環運動により、ピン型攪拌部材の領域における媒体の充填量を制御でき、この部分での粉砕作用を向上させることができる。この構成は、ピン型攪拌部材の領域を粉砕ゾーンと考え、板状攪拌部材の領域を媒体流動領域と考えることもできる。
【００１１】
媒体攪拌型粉砕装置において、多軸構成を採用することは、例えば、特開平８−３１８１４５号公報、特開平９−１０３６６５号公報、実公平６−１８５７７号公報、特公平４−４３６９２号公報、特開平３−３８９０４号公報などにより公知である。しかし、これら公知の２軸又は３軸の粉砕装置は、いずれも、多軸の採用により粉砕用固形媒体の軸方向の流動性を高めようとするものではない。本発明は、これら公知の多軸装置において、攪拌部材の構成を工夫することによって粉砕用固形媒体の軸方向の流動性を高め、媒体に軸方向の循環運動を生じさせて、粉砕効果を著しく高めることができるものである。
【００１２】
【発明の実施の形態】
以下、本発明の実施形態を図について説明する。
図１及び図２は、本発明の一実施形態による２軸媒体攪拌型粉砕装置１を示す縦方向断面図及び横断面図である。ベッセル２は、２つのシリンダーが組み合わされて横断面形状が８字形に形成されたダブルシリンダー形状であり、該ベッセル内には、その８字形を形成する２つのシリンダーのそれぞれの軸心に各１本の攪拌軸５ａ、５ｂがベッセルに対して回転自在に配置されている。
【００１３】
ベッセル２の外周には冷却用又は加熱用の熱媒体を通すジャケット３が形成されている。ベッセルの軸方向一端は蓋部材４により、また他端は蓋部材９により閉じられている。攪拌軸５ａには、軸方向に間隔をもった複数個所、本実施形態では３箇所に攪拌部材６ａが取り付けられている。同様に、攪拌軸５ｂには、軸方向に間隔をもった複数個所、本実施形態では３箇所に攪拌部材６ｂが取り付けられている。撹拌軸５ａ、５ｂは、後述する駆動機構により、図２に矢印Ａ、Ｂで示すように、互いに反対方向に回転駆動される。
【００１４】
図２に示すように、撹拌軸５ａ上の攪拌部材６ａの各々は、上下に密接して配置された対の板状部材７ａから構成されている。板状部材７ａは、中心が撹拌軸５ａと同軸に該撹拌軸５ａに取り付けられた部材であり、矩形形状から回転方向前縁８ａが斜めに切り欠かれた形状である。板状部材７ａの切り欠かれた前縁８ａには、回転方向に傾斜する傾斜面が形成されている。同様に、撹拌軸５ｂ上の撹拌部材６ｂの各々は、上下に密接して配置された対の板状部材７ｂから構成されている。板状部材７ｂは、回転方向前縁８ｂに傾斜面を有する。対をなす板状部材７ａ又は７ｂは、それらの長さ方向中心線が互いに角度αをなすように組み合わされる。この角度αは、６０度から８０度の範囲であることが好ましく、最も良い結果が得られる角度αは、６９度である。
【００１５】
図２に示すように、撹拌軸５ａ、５ｂ上の撹拌部材６ａ、６ｂは、撹拌軸の軸方向にみて互いに重なり合う長さを有する。図１から分かるように、２本の撹拌軸５ａ、５ｂにおいて、対の板状部材７ａからなる撹拌部材６ａと、対の板状部材７ｂからなる撹拌部材６ｂとは、軸方向に互い違いに配置されており、撹拌軸５ａ上の撹拌部材６ａと撹拌軸５ｂ上の撹拌部材６ｂとが互いに干渉することはない。
【００１６】
蓋部材９には被処理物である固形粒子を含むスラリーをベッセル２内に導入するスラリー給排口１０が形成されており、このスラリー給排口１０は、粉砕装置１の作動中は閉じられる。ベッセル２内には、ガラスビーズ又は鉄球などのような粉砕用固形媒体１１が充填される。
【００１７】
図３は、撹拌軸５ａ、５ｂの支持及び駆動機構の一例を具体的に示すものである。撹拌軸５ａ、５ｂの各々は、両端部が軸受け１２により蓋部材４及び蓋部材９に支持されており、撹拌軸５ａ、５ｂの一端は、蓋部材４からベッセル２の外側に突出し、その突出端に傘歯車１３ａ、１３ｂが取り付けられている。ベッセル２の蓋部材４にほぼ平行に駆動軸１４が配置され、該駆動軸１４に設けられた傘歯車１５ａ、１５ｂが傘歯車１３ａ、１３ｂに噛み合っている。この駆動軸１４は、ベルト・プーリー機構１６のような適当な動力伝達機構を介して、図示しない動力源により駆動される。
【００１８】
図１及び図２に示す粉砕装置１の作動においては、ベッセル２内に粉砕用固形媒体１１が充填され、スラリー給排口１０からスラリーが導入されて、給排口１０が閉じられる。次いで、攪拌軸５ａ、５ｂが図２に矢印Ａ、Ｂで示す方向に回転駆動される。この攪拌軸５ａ、５ｂの回転により該攪拌軸５ａ、５ｂ上の攪拌部材６ａ、６ｂも回転し、ベッセル２内の媒体１１を攪拌する。媒体１１は、攪拌部材６ａ、６ｂから与えられる回転運動により、各攪拌軸５ａ、５ｂに関して放射方向外向きに遠心力を生じ、この遠心力の作用により、放射方向外向きに押される。攪拌部材６ａ、６ｂが軸方向に重なる領域、すなわち、ベッセル２内において２つのシリンダーがつながる領域では、２つの攪拌軸５ａ、５ｂ上の攪拌部材６ａ、６ｂから媒体１１に加わる遠心力の作用が重畳されるため、媒体１１はこの領域において密の状態になり、逆に、この領域に対して直径方向反対側の領域では、媒体１１は疎になる。さらに、攪拌部材６ａ、６ｂの板状部材７ａ、７ｂは、回転方向前縁８ａ、８ｂに傾斜面を有するため、媒体１１には、図１において上向きの上昇力が作用する。この上昇力は、攪拌部材６ａ、６ｂが軸方向に重なる領域において２つの攪拌部材６ａ、６ｂの作用が重畳されるため、この領域において媒体１１には上昇運動が与えられる。その結果、他の領域では、媒体１１は下降運動を生じ、ベッセル２内では、全体として、攪拌軸５ａ、５ｂの間の領域で媒体１１が上昇し、ベッセル２の長軸方向両端部及びその付近の領域では媒体１１が下降する、という媒体の縦方向循環運動を生じる。
【００１９】
このような媒体１１の縦方向循環運動により、媒体１１の動きが活発化され、その間を通るスラリーは、媒体１１の間で激しい摩擦作用を受け、スラリーに含まれる固形粒子が細かく粉砕ないしは分散される。このように、この実施形態による媒体攪拌型粉砕装置は、媒体１１に、回転による円周方向運動だけでなく、縦方向の循環運動も生じさせるので、媒体１１の運動が活発化され、スラリー内の固形粒子の粉砕ないしは分散が促進される。したがって、粉砕用固形媒体１１の粒径を極端に小さくすることなく、スラリー内の固形粒子をナノメーターサイズまで粉砕ないしは分散させることが可能になる。この粉砕ないしは分散作用の結果、スラリーの温度上昇が懸念される場合には、ベッセル２の外周に設けたジャケット３に冷却媒体を通す。また、何らかの理由でベッセル２内を加熱する必要がある場合には、このジャケット３に加熱用媒体を通す。本発明を実施した上述の粉砕装置１によれば、比較的短い時間で所期の粉砕効果を達成でき、粉砕用固形媒体１１及び攪拌部材６ａ、６ｂの摩耗が大幅に軽減される。その結果、スラリーに対するコンタミネーションが著しく減少されることになる。
【００２０】
図１及び図２についての上述の作動説明は、ベッセル２内に給排口１０からスラリーを導入し、該給排口１０を閉じて装置１を運転する、いわゆるバッチ式の作動に関するものである。図３は、基本的な構成は図１及び図２に示すものと同一であるが、粉砕装置１を連続運転できる構成を備える。すなわち、図３に示す粉砕装置１においては、ベッセル２の長軸側両端部近傍において、攪拌軸駆動機構が設けられる側の蓋部材４に、スラリー排出口１７ａ、１７ｂが設けられる。図１において給排口として説明された口１０は、スラリー導入口として使用される。スラリーは、このスラリー導入口から連続的にベッセル２内に圧送され、スラリー排出口１７ａ、１７ｂから排出される。その他の点では、図３の粉砕装置１の作動は、図１及び図２に示すものと同じである。
【００２１】
図４は、本発明のさらに別の実施形態を示す。この実施形態においては、攪拌軸５ａ、５ｂに板状部材７ａ、７ｂからなる板状の攪拌部材６ａ、６ｂが設けられる点は、先に述べた実施形態におけると同様である。図４の実施形態では、さらに、攪拌軸５ａ、５ｂの蓋部材９に近接した方の端部近傍に、ピン型攪拌部材１８ａ、１８ｂが取り付けられる。このピン型攪拌部材１８ａ、１８ｂは、攪拌軸５ａ、５ｂに固定された円盤部材１９ａ、１９ｂと、この円盤部材１９ａ、１９ｂから周方向外向きに延びる複数本のピン部材２０ａ、２０ｂとから構成される。
【００２２】
図４に示す実施形態では、板状の攪拌部材６ａ、６ｂにより、媒体１１に、周方向の運動に加えて、縦方向の循環運動が与えられることは、先に述べた実施形態におけると同様である。この媒体１１に与えられる縦方向の循環運動の結果、ピン型攪拌部材１８ａ、１８ｂの領域における媒体１１の充填量が適切に制御できる。ピン型攪拌部材１８ａ、１８ｂは、その近傍にある媒体１１に攪拌作用を与え、この領域でスラリーに粉砕作用を与える。すなわち、このピン型攪拌部材１８ａ、１８ｂが位置する領域は、スラリーに含まれる固形粒子に対する粉砕ゾーンとなる。これに対して、板状攪拌部材６ａ、６ｂのまわりの領域は、既に述べたように媒体の運動を活発化して粉砕作用を高めるものであるが、図４の実施形態では、さらに、この板状攪拌部材６ａ、６ｂのまわりの領域は、ピン型攪拌部材１８ａ、１８ｂのまわりの領域における媒体の充填量を制御するように働く流動ゾーンと考えることができる。
【００２３】
【実施例】
図４に示す構造の粉砕装置１を使用し、粉砕用固形媒体１１として、直径３ｍｍのアルミナビーズをベッセル２の容積の７０％となるまで充填した。スラリーとして、水に炭酸カルシウムを２０％濃度になるように調整したものを用い、バッチ式で攪拌部材の先端速度2.9ｍ/secで運転した。ベッセル外周のジャケット３には冷却剤として冷却水を循環させて冷却を行った。
【００２４】
【比較例】
図６に示す形式の円盤型攪拌部材を有する従来の１軸粉砕装置に直径１ｍｍのジルコニアビーズをベッセルの容積の８０％となるまで充填した。スラリーとして、実施例で使用したものと同じ組成のものを使用し、連続処理方式で、円盤型攪拌部材の周速度が12ｍ/secとなる条件で運転した。ベッセル外周のジャケット１０９には冷却剤として冷却水を循環させて冷却を行った。
【００２５】
【結果】
実験の結果を図５に示す。図５に示すように、実施例では、作動時間すなわち滞留時間２０分の後、スラリー内の固形粒子の平均粒径が0.18μｍとなり、スラリー１ｋｇあたりの運転動力は0.27kWh/kgであった。これに対して比較例では、滞留時間２０分では、固形粒子の平均粒径は0.52μｍで、運転動力は0.61kWh/kgであった。このように、本発明の実施例では、粉砕用固形媒体の粒径を比較例よりも大きくしたにも拘わらず、比較例よりも優れた粉砕効果が達成されることが確認された。また、実施例では、２０分間の滞留時間におけるスラリーの温度上昇が約３℃であったのに対し、比較例では、装置の出口と入口との温度差が約１５℃であった。このように、本発明の実施例では、温度上昇が比較例より低いことが確認できた。また、コンタミネーションに関し、２０分間処理後におけるスラリーのCr（クロム）の混入量を測定した。Crは、ベッセル内壁や撹拌部材の材料であり、この量を測定することにより、ベッセル内壁や撹拌部材の磨耗量を知ることができる。測定の結果、実施例ではCrの混入量は2.07mg/ｌであり、比較例では6.20mg/ｌであった。この測定により、本発明は、粉砕装置の構成材料の磨耗を減少させるのに有効であることが確認できた。
【図面の簡単な説明】
【図１】本発明の一実施形態による媒体攪拌型粉砕装置の概要を示す縦断面図である。
【図２】図１のＩ−Ｉ線における横断面図である。
【図３】本発明の他の実施形態による媒体攪拌型粉砕装置の概要を示す縦断面図である。
【図４】本発明のさらに別の実施形態による媒体攪拌型粉砕装置の概要を示す縦断面図である。
【図５】本発明の具体的実施例と従来の装置による比較例による実験結果を示す図表である。
【図６】従来の１軸型粉砕装置の一例を示すものであって、(a)は水平断面図、(b)は垂直断面図である。
【符号の説明】
１・・・粉砕装置、２・・・ベッセル、３・・・ジャケット、
４、９・・・蓋部材、５ａ、５ｂ・・・攪拌軸、６ａ、６ｂ・・・攪拌部材、
７ａ、７ｂ・・・板状部材、１１・・・粉砕用固形媒体、
１８ａ、１８ｂ・・・ピン型攪拌部材[0001]
BACKGROUND OF THE INVENTION
In the present invention, a solid medium for pulverization is filled in a vessel equipped with a stirring shaft to which a stirring member is attached, and a slurry containing solid particles as an object to be processed is introduced into the vessel and solidified while rotating the stirring shaft. The present invention relates to a medium agitation type pulverizer for pulverizing particles. In particular, the present invention is not limited, but minerals, pigments, dyes, chemical products, ferrites, ceramics, metals, etc. are finely pulverized, or fine particles of these materials are dispersed to form paints, printing inks, pigments. The present invention relates to a medium stirring type pulverizer used for the purpose of adjusting pharmaceuticals such as magnetic paints, rubbers, adhesives, cosmetics, and coatings.
[0002]
[Prior art]
As shown in FIGS. 6 (a) and 6 (b), this type of conventional medium agitation type pulverizer is coaxially connected to a cylindrical vessel 103 closed at both ends by lid plates 101 and 102, and has a pin or disk 104. A stirring shaft 107 having a stirring member such as slab is provided, a solid medium 105 for pulverization such as zirconia beads and glass beads is filled in the vessel 103, and a slurry introduction port 106 provided on one lid plate 102 in the vessel 103. The slurry containing solid particles, which is the object to be treated, is introduced, and the stirring shaft 107 is driven to rotate, so that the solid medium for pulverization is moved, and the shearing force due to the friction between the media acts on the slurry passing between the media. The solid particles are pulverized. In the vicinity of the other lid plate 101 of the vessel 103, an outlet slit is formed by the grinding media separating mechanisms 112 and 113, and the slurry that has passed through the vessel 103 passes through this slit, and the slurry outlet 108 provided in the lid plate 101. Discharged from. This apparatus is normally used for continuous processing in which untreated slurry is continuously introduced from the slurry inlet 106 and treated slurry is discharged continuously from the slurry outlet 108. In this continuous process, the slurry can be circulated in the vessel 103 as many times as necessary. This medium stirring type pulverizer can pulverize solid particles contained in a slurry to a very fine particle size. A coolant circulation jacket 109 is formed outside the vessel 103, and a coolant such as coolant is introduced from the coolant inlet 110 and discharged from the coolant outlet 111, thereby generating a coolant circulation flow. The slurry inside the vessel 103 can be cooled.
[0003]
By the way, in recent years, the request | requirement with respect to refinement | miniaturization of a solid particle is very high, and refinement | miniaturization to nanometer size has been calculated | required. In order to cope with such a demand, it is necessary to further reduce the size of the solid medium for grinding. However, when the diameter of the medium is reduced, the pulverization force that acts on the solid particles as the object to be processed from the medium must be increased in inverse proportion to the medium diameter. For this reason, the required driving power increases accordingly, and at the same time the driving speed must be increased. Further, in order to achieve the required pulverized particle size, the processing time, that is, the residence time of the slurry in the vessel also becomes longer. When these conditions overlap, the solid medium for pulverization and the stirring member are likely to be worn, the contamination of the slurry is increased, and the temperature of the slurry is increased.
[0004]
[Problems to be solved by the invention]
The present invention reduces or eliminates the problems of increased contamination, increased operating power, and increased slurry temperature accompanying the demand for finer solid particles, and has been particularly remarkable in recent years. It is a problem to be solved to provide a medium agitation type pulverization apparatus that can meet the demands for
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a medium stirring type biaxial crusher. According to one aspect of the present invention, the biaxial crusher is provided at each of both ends of the vessel in the longitudinal direction and a double cylinder-shaped vessel in which two cylinders are combined to form an eight-shaped cross section. A lid plate, two agitation shafts arranged one by one on the respective shaft centers of the two cylinders forming the 8-shape of the vessel, and attached to each of the agitation shafts with an interval in the axial direction. A plurality of stirring members, drive means for driving the two stirring shafts to rotate in the opposite directions at the same rotational speed, and for introducing and discharging the slurry to be processed into the vessel A slurry introduction port and a discharge port provided in at least one of the lid plates. The vessel is filled with a solid medium for pulverization, and the solid particles contained in the slurry are pulverized while the stirring shaft is driven to rotate. The plurality of stirring members attached to the two stirring shafts have lengths that overlap each other in the axial projection of the stirring shafts, and the stirring members attached to the adjacent stirring shafts do not interfere with each other during rotation. Placed in. Further, in each of the agitation shafts, at each of a plurality of positions separated in the axial direction, the two plate-like members having substantially the same shape as the agitation shaft make a pair and are in close contact with each other in the axial direction. In addition, each pair of the two members is disposed with an interval in the axial direction with respect to the other pair. In this pulverizing apparatus, when the two stirring shafts are driven to rotate in opposite directions, the solid medium for pulverization in the vessel is dense in the region where the stirring members on adjacent stirring shafts overlap. It is forced to move in one direction substantially along the axial direction of the stirring shaft, becomes a sparse state in the region opposite to the region where the stirring members overlap, and performs a circular motion that moves in the direction opposite to the one direction described above. It is configured in a shape to be generated.
[0006]
In another aspect of the present invention, each of the stirring members is a plate-like member fixed to the stirring shaft so that its center is coaxial with the stirring shaft and extends radially from the stirring shaft, and the plate-like member rotates in the rotational direction. An inclined surface is formed at the front edge. Due to the inclined surface, the above-described unidirectional movement is induced in the solid medium for grinding in the vessel. In still another aspect of the present invention, each of the stirring members is a substantially rectangular plate-like member fixed to the stirring shaft so that its center is coaxial with the stirring shaft and extends radially from the stirring shaft. The plate-shaped member has a shape in which the front edge portion in the rotational direction is cut obliquely toward the tip, and an inclined surface is formed at the edge portion of the oblique cut portion. In these aspects of the present invention, the plate-like members constituting the stirring member are paired with two substantially identical plate-like members at each of a plurality of positions separated in the axial direction of the respective stirring shafts. And, they are arranged shifted in the angular direction. In this case, the deviation of the paired plate-like members in the angular direction is in the range of 60 to 80 degrees.
[0007]
Furthermore, in the pulverizing apparatus of the present invention, a jacket for the heat medium can be formed on the outer periphery of the vessel. In addition, a pin-type stirring member in which a plurality of pins protruding radially on the outer periphery of the disk can be attached to each of the stirring shafts in the vicinity of the end opposite to the one direction described above.
[0008]
When pulverizing solid particles in a slurry using the medium agitation type pulverizer of the present invention, the two agitation shafts are rotationally driven in the opposite directions at the same rotational speed and attached to the two agitation shafts. In the region where the stirrer members overlap each other, a state in which the solid medium for grinding becomes nectar is generated, the solid medium for grinding moves in one direction along the axial direction of the stirrer shaft, and the region where the stirrer members overlap each other In the opposite region, the pulverizing solid medium is generated in a sparse state, and the pulverizing solid medium is moved in a direction opposite to the one direction so that the circulating movement of the pulverizing solid medium is changed to the pulverizing solid medium. Generate in the medium.
[0009]
As described above, in the medium agitation type pulverizer according to the present invention, the two agitation shafts having the agitation members are juxtaposed, and the agitation members attached to the two agitation shafts are opposite to each other in a state where they overlap each other when viewed in the axial direction. It is rotationally driven in the direction. Therefore, the solid medium for pulverization tends to be concentrated in a region where the stirring members overlap with each other when viewed in the axial direction. And since the stirring members on the two adjacent stirring shafts are configured to generate the action of propelling the solid medium for pulverization in the same axial direction, in the region where the stirring members overlap each other in the axial direction, The propelling action of the stirring member provided on the two stirring shafts is superimposed, and in this region, the medium is moved in the propelling action direction of the stirring member. As a result, in other areas, the pulverizing solid medium becomes sparse and is moved in the direction opposite to the propulsion direction of the stirring member, and as a whole, an active circulating movement of the medium occurs in the vessel. Due to the active circulation of the solid medium for grinding, the grinding action on the solid particles contained in the slurry becomes active, and a satisfactory grinding effect can be obtained without reducing the particle size of the medium. The circulating motion of the medium can be enhanced by using a plate-like member as the stirring member and arranging the plate-like members in pairs and shifting them in the angular direction. In particular, when the angular deviation is in the range of 60 degrees to 80 degrees, the circulation of the medium is remarkably activated. The most preferred corner angle is 69 ° ± 1 °.
[0010]
In addition, in the configuration in which a pin type stirring member in which a plurality of pins projecting radially is arranged on the outer periphery of the disc is attached in the vicinity of each one end of the stirring shaft, the circulating motion of the solid medium for grinding generated by the plate-like stirring member Thus, the medium filling amount in the region of the pin-type stirring member can be controlled, and the pulverizing action in this portion can be improved. In this configuration, the region of the pin-type stirring member can be considered as a pulverization zone, and the region of the plate-like stirring member can be considered as a medium flow region.
[0011]
In the medium agitation type pulverizer, adopting a multi-axis configuration is, for example, disclosed in JP-A-8-318145, JP-A-9-103665, JP-A-6-18577, JP-B-4-43692, This is known from JP-A-3-38904. However, none of these known biaxial or triaxial pulverizers attempt to increase the fluidity in the axial direction of the pulverized solid medium by adopting multiple axes. The present invention improves the axial fluidity of the pulverizing solid medium by devising the configuration of the stirring member in these known multi-axis devices, and causes the medium to circulate in the axial direction, thereby significantly increasing the pulverizing effect. It can be raised.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are a longitudinal sectional view and a transverse sectional view showing a biaxial medium agitation type pulverizing apparatus 1 according to an embodiment of the present invention. The vessel 2 has a double cylinder shape in which two cylinders are combined to form an eight-shaped cross section, and each of the two cylinders forming the eight-shaped shape has one shaft center in the vessel. The stirring shafts 5a and 5b are arranged so as to be rotatable with respect to the vessel.
[0013]
A jacket 3 through which a heat medium for cooling or heating is passed is formed on the outer periphery of the vessel 2. One end of the vessel in the axial direction is closed by a lid member 4 and the other end is closed by a lid member 9. The agitation member 5a is attached to the agitation shaft 5a at a plurality of locations having an interval in the axial direction, that is, at three locations in the present embodiment. Similarly, agitation members 5b are attached to the agitation shaft 5b at a plurality of locations with an interval in the axial direction, in this embodiment, at 3 locations. The agitation shafts 5a and 5b are rotationally driven in directions opposite to each other as indicated by arrows A and B in FIG.
[0014]
As shown in FIG. 2, each of the stirring members 6a on the stirring shaft 5a is composed of a pair of plate-like members 7a arranged in close contact with each other. The plate-like member 7a is a member attached to the stirring shaft 5a coaxially with the stirring shaft 5a, and has a shape in which the front edge 8a in the rotational direction is cut obliquely from a rectangular shape. An inclined surface that is inclined in the rotational direction is formed on the notched front edge 8a of the plate-like member 7a. Similarly, each of the stirring members 6b on the stirring shaft 5b is composed of a pair of plate-like members 7b arranged closely in the vertical direction. The plate-like member 7b has an inclined surface at the rotation direction front edge 8b. The plate-like members 7a or 7b forming a pair are combined such that their longitudinal center lines form an angle α with each other. This angle α is preferably in the range of 60 degrees to 80 degrees, and the angle α that gives the best results is 69 degrees.
[0015]
As shown in FIG. 2, the stirring members 6a and 6b on the stirring shafts 5a and 5b have a length that overlaps each other when viewed in the axial direction of the stirring shaft. As can be seen from FIG. 1, in the two agitation shafts 5a and 5b, the agitation member 6a composed of the pair of plate members 7a and the agitation member 6b composed of the pair of plate members 7b are alternately arranged in the axial direction. Thus, the stirring member 6a on the stirring shaft 5a and the stirring member 6b on the stirring shaft 5b do not interfere with each other.
[0016]
The lid member 9 is formed with a slurry supply / exhaust port 10 for introducing slurry containing solid particles, which is an object to be processed, into the vessel 2, and this slurry supply / exhaust port 10 is closed during operation of the pulverizer 1. . The vessel 2 is filled with a pulverizing solid medium 11 such as glass beads or iron balls.
[0017]
FIG. 3 specifically shows an example of the support and drive mechanism of the stirring shafts 5a and 5b. Both ends of each of the stirring shafts 5a and 5b are supported by the lid member 4 and the lid member 9 by bearings 12, and one end of each of the stirring shafts 5a and 5b projects from the lid member 4 to the outside of the vessel 2, and the projection Bevel gears 13a and 13b are attached to the ends. A drive shaft 14 is disposed substantially parallel to the lid member 4 of the vessel 2, and bevel gears 15a and 15b provided on the drive shaft 14 mesh with the bevel gears 13a and 13b. The drive shaft 14 is driven by a power source (not shown) via an appropriate power transmission mechanism such as a belt / pulley mechanism 16.
[0018]
In the operation of the pulverizing apparatus 1 shown in FIGS. 1 and 2, the crushing solid medium 11 is filled in the vessel 2, the slurry is introduced from the slurry supply / discharge port 10, and the supply / discharge port 10 is closed. Next, the agitation shafts 5a and 5b are rotationally driven in the directions indicated by arrows A and B in FIG. By the rotation of the stirring shafts 5a and 5b, the stirring members 6a and 6b on the stirring shafts 5a and 5b are also rotated, and the medium 11 in the vessel 2 is stirred. The medium 11 generates a centrifugal force outwardly in the radial direction with respect to the respective stirring shafts 5a and 5b by the rotational motion given from the stirring members 6a and 6b, and is pushed outward in the radial direction by the action of the centrifugal force. In the region where the stirring members 6a and 6b overlap in the axial direction, that is, in the region where the two cylinders are connected in the vessel 2, the action of the centrifugal force applied to the medium 11 from the stirring members 6a and 6b on the two stirring shafts 5a and 5b occurs. As a result of the superposition, the medium 11 becomes dense in this region, and conversely, the medium 11 becomes sparse in the region opposite to the region in the diametrical direction. Further, since the plate-like members 7a and 7b of the stirring members 6a and 6b have inclined surfaces at the rotation direction leading edges 8a and 8b, upward force in FIG. 1 acts on the medium 11. Since the ascending force is superimposed on the action of the two agitating members 6a and 6b in the region where the agitating members 6a and 6b overlap in the axial direction, the ascending motion is given to the medium 11 in this region. As a result, in the other region, the medium 11 moves downward, and in the vessel 2, the medium 11 ascends as a whole in the region between the stirring shafts 5a and 5b. In the nearby region, the medium 11 descends in the longitudinal direction of the medium.
[0019]
Due to the longitudinal circulation movement of the medium 11, the movement of the medium 11 is activated, and the slurry passing between the medium 11 is subjected to intense friction between the medium 11, and the solid particles contained in the slurry are finely pulverized or dispersed. The As described above, the medium agitation type pulverizer according to this embodiment causes the medium 11 to generate not only the circumferential movement by rotation but also the vertical circulation movement. The solid particles are pulverized or dispersed. Therefore, the solid particles in the slurry can be pulverized or dispersed to a nanometer size without extremely reducing the particle size of the pulverizing solid medium 11. As a result of this pulverization or dispersion action, if there is a concern about an increase in the temperature of the slurry, a cooling medium is passed through the jacket 3 provided on the outer periphery of the vessel 2. If it is necessary to heat the inside of the vessel 2 for some reason, the heating medium is passed through the jacket 3. According to the above-described pulverizing apparatus 1 embodying the present invention, the desired pulverizing effect can be achieved in a relatively short time, and wear of the pulverizing solid medium 11 and the stirring members 6a and 6b is greatly reduced. As a result, contamination with the slurry is significantly reduced.
[0020]
1 and 2 relates to a so-called batch operation in which slurry is introduced into the vessel 2 from the supply / discharge port 10 and the supply / discharge port 10 is closed to operate the apparatus 1. . FIG. 3 has the same basic configuration as that shown in FIGS. 1 and 2, but includes a configuration capable of continuously operating the pulverizer 1. That is, in the pulverizer 1 shown in FIG. 3, the slurry discharge ports 17 a and 17 b are provided in the lid member 4 on the side where the stirring shaft driving mechanism is provided in the vicinity of both ends of the long axis side of the vessel 2. The port 10 described as the supply / discharge port in FIG. 1 is used as a slurry introduction port. The slurry is continuously pumped into the vessel 2 from the slurry inlet and discharged from the slurry outlets 17a and 17b. In other respects, the operation of the crusher 1 of FIG. 3 is the same as that shown in FIG. 1 and FIG.
[0021]
FIG. 4 shows yet another embodiment of the present invention. In this embodiment, the point that the plate-like stirring members 6a and 6b including the plate-like members 7a and 7b are provided on the stirring shafts 5a and 5b is the same as in the above-described embodiment. In the embodiment of FIG. 4, pin-type stirring members 18 a and 18 b are further attached near the ends of the stirring shafts 5 a and 5 b near the lid member 9. The pin-type stirring members 18a and 18b are composed of disk members 19a and 19b fixed to the stirring shafts 5a and 5b, and a plurality of pin members 20a and 20b extending outward in the circumferential direction from the disk members 19a and 19b. Is done.
[0022]
In the embodiment shown in FIG. 4, the plate-like stirring members 6 a and 6 b give the medium 11 a circular circulation motion in addition to the circumferential motion, as in the above-described embodiment. It is. As a result of the vertical circulation motion applied to the medium 11, the filling amount of the medium 11 in the region of the pin type stirring members 18a and 18b can be controlled appropriately. The pin-type stirring members 18a and 18b give a stirring action to the medium 11 in the vicinity thereof, and give a grinding action to the slurry in this region. That is, the region where the pin-type stirring members 18a and 18b are located is a pulverization zone for solid particles contained in the slurry. On the other hand, the region around the plate-like stirring members 6a and 6b activates the movement of the medium to enhance the crushing action as described above. In the embodiment shown in FIG. The area around the stirrer 6a, 6b can be thought of as a flow zone that serves to control the amount of media filling in the area around the pin agitators 18a, 18b.
[0023]
【Example】
Using the pulverizer 1 having the structure shown in FIG. 4, alumina beads having a diameter of 3 mm were filled as the solid medium 11 for pulverization until the volume of the vessel 2 reached 70%. The slurry was adjusted to 20% calcium carbonate in water, and was operated batchwise at a tip speed of the stirring member of 2.9 m / sec. The jacket 3 on the outer periphery of the vessel was cooled by circulating cooling water as a coolant.
[0024]
[Comparative example]
A conventional uniaxial crusher having a disk type stirring member of the type shown in FIG. 6 was filled with zirconia beads having a diameter of 1 mm until the volume of the vessel reached 80%. A slurry having the same composition as that used in the example was used as a slurry, and was operated in a continuous treatment method under the condition that the peripheral speed of the disc type stirring member was 12 m / sec. The jacket 109 on the outer periphery of the vessel was cooled by circulating cooling water as a coolant.
[0025]
【result】
The result of the experiment is shown in FIG. As shown in FIG. 5, in the example, after an operation time, that is, a residence time of 20 minutes, the average particle size of the solid particles in the slurry was 0.18 μm, and the driving power per 1 kg of the slurry was 0.27 kWh / kg. On the other hand, in the comparative example, when the residence time was 20 minutes, the average particle size of the solid particles was 0.52 μm and the driving power was 0.61 kWh / kg. Thus, in the Example of this invention, although the particle size of the solid medium for grinding | pulverization was enlarged rather than the comparative example, it was confirmed that the grinding effect superior to the comparative example is achieved. In the example, the temperature rise of the slurry during the residence time of 20 minutes was about 3 ° C., whereas in the comparative example, the temperature difference between the outlet and the inlet of the apparatus was about 15 ° C. Thus, in the Example of this invention, it has confirmed that a temperature rise was lower than a comparative example. Further, regarding contamination, the amount of Cr (chromium) mixed in the slurry after treatment for 20 minutes was measured. Cr is a material for the inner wall of the vessel and the stirring member, and the amount of wear of the inner wall of the vessel and the stirring member can be known by measuring this amount. As a result of the measurement, the amount of Cr mixed in the example was 2.07 mg / l, and the comparative example was 6.20 mg / l. From this measurement, it was confirmed that the present invention is effective in reducing the wear of the constituent materials of the pulverizer.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an outline of a medium stirring type pulverizing apparatus according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line II of FIG.
FIG. 3 is a longitudinal sectional view showing an outline of a medium agitation type pulverizer according to another embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing an outline of a medium agitation type pulverizer according to still another embodiment of the present invention.
FIG. 5 is a chart showing experimental results of a specific example of the present invention and a comparative example using a conventional apparatus.
6A and 6B show an example of a conventional single-shaft crusher, where FIG. 6A is a horizontal cross-sectional view and FIG. 6B is a vertical cross-sectional view.
[Explanation of symbols]
1 ... crusher, 2 ... vessel, 3 ... jacket,
4, 9 ... lid member, 5a, 5b ... stirring shaft, 6a, 6b ... stirring member,
7a, 7b ... plate-like member, 11 ... solid medium for grinding,
18a, 18b ... Pin type stirring member

Claims

A double-cylinder-shaped vessel in which two cylinders are combined to form an 8-shaped cross-section;
Cover plates provided respectively at both ends in the longitudinal direction of the vessel;
Two agitation shafts, one each arranged at the axial center of each of the two cylinders forming the 8-shape of the vessel;
A plurality of agitation members attached to each of the agitation shafts at intervals in the axial direction;
Drive means for driving the two stirring shafts to rotate in opposite directions at the same rotational speed;
A slurry introduction port and a discharge port provided in at least one of the lid plates for introducing and discharging slurry as an object to be processed into the vessel,
With
The vessel is filled with a pulverizing solid medium and the agitation shaft is rotationally driven to pulverize the solid particles contained in the slurry.
Each of the stirring members is a substantially rectangular plate-like member fixed to the stirring shaft so that its center is coaxial with the stirring shaft and extends radially from the stirring shaft, and the rectangular plate-like member rotates in the rotation direction. The front edge is a shape that is obliquely cut toward the tip, and an inclined surface is formed at the edge of the obliquely cut portion,
The inclined surfaces of the plurality of stirring members attached to the two stirring shafts are such that when the stirring shaft is driven by the driving means, each stirring member has the same axis with respect to the slurry and the solid medium for pulverization. It is formed on the same axial surface in all the stirring members so as to give a propulsive force directed in the direction,
The plurality of stirring members attached to the two stirring shafts have a length overlapping each other in the axial projection of the stirring shafts, and the stirring members attached to the adjacent stirring shafts do not interfere with each other during rotation. Arranged as
Each of the agitation shafts has two substantially identical plate members as the agitation member in a plurality of positions apart from each other in the axial direction to form a pair in close contact with each other in the axial direction, and Each of the two plate-like members is disposed with an interval in the axial direction with respect to the other pair, and is attached to each other at an angle in the range of 60 degrees to 80 degrees in the angular direction.
When the two stirring shafts are driven to rotate in directions opposite to each other, the pulverizing solid medium in the vessel is in a dense state in a region where the stirring members on adjacent stirring shafts overlap, and the shape of the stirring member Forced to move in one direction substantially along the axial direction of the stirring shaft, the stirring member becomes sparse in the region opposite to the overlapping region, and causes a circular motion that moves in the opposite direction to the one direction. Became,
A crushing apparatus characterized by that.

A double-cylinder-shaped vessel in which two cylinders are combined to form an 8-shaped cross-section;
Cover plates provided respectively at both ends in the longitudinal direction of the vessel;
Two agitation shafts, one each arranged at the axial center of each of the two cylinders forming the 8-shape of the vessel;
A plurality of agitation members attached to each of the agitation shafts at intervals in the axial direction;
Drive means for driving the two stirring shafts to rotate in opposite directions at the same rotational speed;
A slurry introduction port and a discharge port provided in at least one of the lid plates for introducing and discharging slurry as an object to be processed into the vessel,
With
The vessel is filled with a pulverizing solid medium and the agitation shaft is rotationally driven to pulverize the solid particles contained in the slurry.
Each of the stirring members is a plate-like member fixed to the stirring shaft so that its center is coaxial with the stirring shaft and extends radially from the stirring shaft, and the plate-like member has an inclined surface at the front edge portion in the rotation direction. Formed,
The inclined surfaces of the plurality of stirring members attached to the two stirring shafts are such that when the stirring shaft is driven by the driving means, each stirring member has the same axis with respect to the slurry and the solid medium for pulverization. It is formed on the same axial surface in all the stirring members so as to give a propulsive force directed in the direction,
The plurality of stirring members attached to the two stirring shafts have a length overlapping each other in the axial projection of the stirring shafts, and the stirring members attached to the adjacent stirring shafts do not interfere with each other during rotation. Arranged as
Each of the agitation shafts has two substantially identical plate members as the agitation member in a plurality of positions apart from each other in the axial direction to form a pair in close contact with each other in the axial direction, and Each of the two pairs of plate-like stirring members is disposed with an interval in the axial direction with respect to the other pair, and is attached to each other at an angle in the range of 60 degrees to 80 degrees in the angular direction.
When the two stirring shafts are driven to rotate in directions opposite to each other, the pulverizing solid medium in the vessel is in a dense state in a region where the stirring members on adjacent stirring shafts overlap, and the shape of the stirring member Forced to move in one direction substantially along the axial direction of the stirring shaft, the stirring member becomes sparse in the region opposite to the overlapping region, and causes a circular motion that moves in the opposite direction to the one direction. Became,
A crushing apparatus characterized by that.

A double-cylinder-shaped vessel in which two cylinders are combined to form an 8-shaped cross-section;
Cover plates provided respectively at both ends in the longitudinal direction of the vessel;
Two agitation shafts, one each arranged at the axial center of each of the two cylinders forming the 8-shape of the vessel;
A plurality of agitation members attached to each of the agitation shafts at intervals in the axial direction;
Drive means for driving the two stirring shafts to rotate in opposite directions at the same rotational speed;
A slurry introduction port and a discharge port provided in at least one of the lid plates for introducing and discharging slurry as an object to be processed into the vessel,
With
The vessel is filled with a pulverizing solid medium and the agitation shaft is rotationally driven to pulverize the solid particles contained in the slurry.
The plurality of stirring members attached to the two stirring shafts have a length overlapping each other in the axial projection of the stirring shafts, and the stirring members attached to the adjacent stirring shafts do not interfere with each other during rotation. Arranged as
The stirring member is configured to give a propulsive force in one direction along an axial direction of a stirring shaft to the slurry and the solid medium for grinding when driven by the driving unit,
When the two stirring shafts are driven to rotate in opposite directions, the stirring member is in a state where the solid medium for pulverization in the vessel is in a dense state in a region where the stirring members on adjacent stirring shafts overlap. Forced to move in one direction substantially along the axial direction of the shaft, the stirring member becomes sparse in a region opposite to the region where the stirring members overlap, causing a circular motion that moves in a direction opposite to the one direction A crusher characterized by being formed into a shape.

The pulverizing apparatus according to any one of claims 1 to 3 , wherein a jacket for a heat medium is formed on an outer peripheral portion of the vessel.

A grinding apparatus according to any one of claims 1 to 4, each of the stirring shaft, the near end opposite to the one direction, the radially outer periphery of the disc A pulverizer characterized in that a pin-type stirring member having a plurality of protruding pins is attached.