JP2790228B2 - Batch operation method of centrifugal fluidized crusher - Google Patents

Batch operation method of centrifugal fluidized crusher

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Publication number
JP2790228B2
JP2790228B2 JP24372892A JP24372892A JP2790228B2 JP 2790228 B2 JP2790228 B2 JP 2790228B2 JP 24372892 A JP24372892 A JP 24372892A JP 24372892 A JP24372892 A JP 24372892A JP 2790228 B2 JP2790228 B2 JP 2790228B2
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JP
Japan
Prior art keywords
diameter
grinding
dish
batch
rotating plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP24372892A
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Japanese (ja)
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JPH0691189A (en
Inventor
敏夫 若林
忠之 古閑
充 池田
Original Assignee
宇部興産株式会社
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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は,セラミックスや無機ま
たは有機化合物を微粉砕する粉砕装置に係り,さらに詳
しくは,回転皿および外周環を備えており,装置内部に
収納した鋼球またはセラミックスボール等の粉砕媒体を
遠心流動させることにより原料の粉砕を行なうようにし
た遠心流動粉砕装置のバッチ運転方法に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing apparatus for finely pulverizing ceramics or inorganic or organic compounds, and more particularly, to a steel ball or a ceramic ball provided with a rotating plate and an outer ring and housed inside the apparatus. The present invention relates to a batch operation method of a centrifugal fluidized-pulverization device that pulverizes a raw material by centrifugally flowing a pulverizing medium such as the above.
【0002】[0002]
【従来の技術】粉砕装置は,チューブミル,竪形ミルな
ど各種の形式のものがあるが,回転皿を上向きに設置
し,この回転皿を回転させることにより,内部に収納し
た鋼球またはセラミックスボール等の粉砕媒体(以下,
ボールという。)を循環運動させて原料の粉砕ならびに
摩砕を行なうようにした竪型ボールミルと通称されるも
のが知られている。
2. Description of the Related Art There are various types of pulverizers such as a tube mill and a vertical mill. A rotating plate is placed upward and the rotating plate is rotated to store steel balls or ceramics contained therein. Grinding media such as balls
It is called a ball. ) Is generally known as a vertical ball mill in which raw materials are crushed and ground by circulating motion.
【0003】古くから用いられているこの種の竪型ボー
ルミルにおいては,粉砕ならびに摩砕作用が弱い,ある
いは装置に投入されたエネルギが粉砕ならびに摩砕作用
以外に消費され易く,エネルギ効率が低いなどの問題が
あった。そこで,本出願人は,次のごとき回転皿および
固定環(外周環)を有する遠心流動粉砕装置を特許出願
した。(特願昭60−265379号,同60−266
867〜266872号,同61−99745号,同6
1−207603号等)。
[0003] In this type of vertical ball mill which has been used for a long time, the crushing and grinding actions are weak, or the energy input to the apparatus is easily consumed in addition to the crushing and grinding actions, and the energy efficiency is low. There was a problem. Accordingly, the present applicant has filed a patent application for a centrifugal flow pulverizer having a rotating dish and a fixed ring (outer ring) as described below. (Japanese Patent Application Nos. 60-265379 and 60-266)
867-266872, 61-99745, 6
No. 1-207603).
【0004】図5はこれらの遠心流動粉砕装置の一例
示しており、この回転皿6は回転軸芯が鉛直方向を向い
ていて、下方に向かって拡径する円錐形状の皿面6a
有し、かつ該皿面6aの縦断面が中央部から外周部にか
けて凹状に湾曲している形状の回転自在な皿状のもので
ある。外周環7は、少なくとも上部が上方に向かって縮
径する内壁面を有し、該内壁面の縦断面が凹状に湾曲し
ている形状であり、前記回転皿6と同軸的に周設されて
静止している。そして、遠心流動粉砕装置1は、前記回
転皿6の皿面6aと外周環7の内壁面とが、回転皿6と
外周環7との間の微小隙間19を除いて、連続的な円滑
面に形成されている。
FIG. 5 shows an example of such a centrifugal fluidized crusher. The rotating plate 6 has a conical dish surface 6a whose rotating shaft is oriented vertically and whose diameter increases downward. And the vertical cross section of the plate surface 6a extends from the center to the outer periphery.
It is a rotatable dish-shaped thing which has a concavely curved shape. The outer peripheral ring 7 has at least an inner wall surface whose upper part is reduced in diameter upward, the longitudinal cross section of the inner wall surface is concavely curved, and is provided coaxially with the rotating plate 6. It is stationary. The centrifugal fluidized crusher 1 is configured such that the plate surface 6a of the rotating plate 6 and the inner wall surface of the outer peripheral ring 7 have a continuous smooth surface except for a minute gap 19 between the rotating plate 6 and the outer peripheral ring 7. Is formed.
【0005】符号8は粉砕装置の本体部分を覆うケーシ
ングであって,外周環7は連結部材9を介してケーシン
グ8の内面に取付けられている。符号10は柱脚であっ
て,ベアリング11を介して回転皿6を枢支している。
回転軸2は,減速機構等を介して電動機等の原動装置に
連結されている。ケーシング8の天井中央部分には原料
の投入管12が設置されており,かつこの投入管12を
取巻くようにダクト13が設けられ,このダクト13に
回転筒14が接続されている。
[0005] Reference numeral 8 denotes a casing that covers the main body of the pulverizer, and an outer peripheral ring 7 is attached to the inner surface of the casing 8 via a connecting member 9. Reference numeral 10 denotes a column base, which pivotally supports the rotating plate 6 via a bearing 11.
The rotating shaft 2 is connected to a driving device such as an electric motor via a reduction mechanism or the like. At the center of the ceiling of the casing 8, there is provided a feed pipe 12 for the raw material, and a duct 13 is provided so as to surround the feed pipe 12, and a rotary cylinder 14 is connected to the duct 13.
【0006】外周環7は,本実施例ではライナが内張り
されるとともに,その壁面を貫通するように多数のスリ
ットまたは小孔15が穿設されている。外周環7外面の
底部とケーシング8内面との間には側部カバー16が周
設されており,この側部カバー16とケーシング8およ
び外周環7外面との間に空気導入室17が区画形成さ
れ,空気導入管18から空気が導入可能とされている。
なお,側部カバー16の上端は外周環7の側部外面に封
着されている。
In the present embodiment, the outer ring 7 is lined with a liner, and is provided with a number of slits or small holes 15 so as to penetrate the wall surface. A side cover 16 is provided between the bottom of the outer peripheral ring 7 and the inner surface of the casing 8, and an air introduction chamber 17 is formed between the side cover 16, the casing 8 and the outer surface of the outer peripheral ring 7. Thus, air can be introduced from the air introduction pipe 18.
The upper end of the side cover 16 is sealed to the outer surface of the side of the outer peripheral ring 7.
【0007】一方,回転皿6の外周縁と外周環7の底部
内周縁との間には,最小ボール径の10〜30%のクリ
アランス19があいており,底部カバー20がこのクリ
アランス19の下側を覆うように周設されている。な
お,本実施例では,側部カバー16に透孔を開設する
か,あるいは空気導入管を接続するなどして,この底部
カバー20内へも空気が導入可能とされている。底部カ
バー20および前記空気導入室17には,粉粒体の抜出
および搬送用の管路21が接続され,この管路21は投
入管12へ粉粒体を返送可能に配設されている。また,
回転皿6の外周縁下側には,スクレーパ22が固設さ
れ,底部カバー20内に落下した粉粒体を抜出用の管路
21の接続部へ向けて寄せ集めるよう構成されている。
On the other hand, a clearance 19 of 10 to 30% of the minimum ball diameter is provided between the outer peripheral edge of the rotating plate 6 and the inner peripheral edge of the bottom of the outer peripheral ring 7, and the bottom cover 20 is located below the clearance 19. It is provided to cover the side. In this embodiment, air can be introduced into the bottom cover 20 by forming a through hole in the side cover 16 or connecting an air introduction pipe. The bottom cover 20 and the air introduction chamber 17 are connected to a pipe 21 for extracting and transporting the powder, and the pipe 21 is arranged so that the powder can be returned to the input pipe 12. . Also,
A scraper 22 is fixed to the lower side of the outer peripheral edge of the rotating plate 6, and is configured to collect powder particles falling into the bottom cover 20 toward a connection portion of a pipe 21 for extraction.
【0008】ケーシング8の上面部を被うように蓋体2
8が設けられている。この蓋体28の頂部中央には前記
回転筒14が挿入されており,ベアリング29によって
これを枢支している。この回転筒14は,例えばプーリ
29aおよびベルト29b等の適宜の動力伝達手段によ
って駆動装置(図示せず)に接続されている。なお,こ
の回転筒14の上端とダクト13の下端とは回転自在に
連結機構にて連結されている。
[0010] The lid 2 is so covered as to cover the upper surface of the casing 8.
8 are provided. The rotary cylinder 14 is inserted into the center of the top of the lid 28, and is pivotally supported by a bearing 29. The rotary cylinder 14 is connected to a driving device (not shown) by appropriate power transmission means such as a pulley 29a and a belt 29b. The upper end of the rotary cylinder 14 and the lower end of the duct 13 are rotatably connected by a connecting mechanism.
【0009】而して,この回転筒14の下端に分級機3
0が連設されている。本実施例において,分級機30は
上下1対の回転円板31,32,該円板31,32の縁
部に挟設された第1の羽根33,円板31の縁部に立設
された第2の羽根34,円板32の縁部に垂設された第
3の羽根35を備えている。また,分級機30を取囲む
ように撹拌ブレード36が設けられている。このブレー
ド36は図示しないステーを介して円板31,32に連
結され,分級機30とともに回転するようになってい
る。
A classifier 3 is provided at the lower end of the rotary cylinder 14.
0 is continuously provided. In this embodiment, the classifier 30 is erected on a pair of upper and lower rotating disks 31, 32, a first blade 33 sandwiched between the edges of the disks 31, 32, and an edge of the disk 31. A second blade 34 and a third blade 35 vertically provided at an edge of the disk 32. Further, a stirring blade 36 is provided so as to surround the classifier 30. The blade 36 is connected to the discs 31 and 32 via a stay (not shown), and rotates together with the classifier 30.
【0010】この分級機30においては,粉砕物を含む
空気は,第3の羽根35および撹拌ブレード36によっ
て粒子が分散された後,第1の羽根33で分級され,微
粉分は円板31,32間の中央に流入し,回転筒14へ
抜き出される。一方,第1の羽根33で分級された粗粉
は第2の羽根34の循環ファン効果により蓋体28の内
面に沿うように流れて粉砕室27へ戻される。
In the classifier 30, the air containing the pulverized material is classified by the first blade 33 after the particles are dispersed by the third blade 35 and the stirring blade 36. It flows into the center between 32 and is extracted to the rotary cylinder 14. On the other hand, the coarse powder classified by the first blade 33 flows along the inner surface of the lid 28 and returns to the crushing chamber 27 by the circulation fan effect of the second blade 34.
【0011】このように構成された粉砕装置において,
原料は投入管12から粉砕室27内に投入される。一
方,回転皿6の回転に伴って粉砕媒体(スチールボール
またはセラミックボール)は粉砕室27内において,外
周環7と皿面6aとを循環する円運動と,回転皿6の軸
心回りの公転運動との合成による縄を綯うような「螺旋
運動」を行ない,その間で原料の粉砕を行なう。また,
空気導入管18から空気導入室17および底部カバー2
0内に導入された空気は,クリアランス19,スリット
または小孔15を通って粉砕室27内に流入し,粉砕に
よって生じた粉末を伴って分級機30に到達し,分級作
用を受け,粗粉分は再度粉砕室27に戻され,細粒分は
回転筒14およびダクト13を経て捕集手段へ送られ,
捕集機において捕集される。
In the crushing device thus configured,
The raw material is charged into the crushing chamber 27 from the charging pipe 12. On the other hand, as the rotating plate 6 rotates, the grinding medium (steel ball or ceramic ball) circulates in the grinding chamber 27 between the outer peripheral ring 7 and the plate surface 6a, and revolves around the axis of the rotating plate 6. A "spiral movement" is performed, which combines a movement with a movement, and the raw material is crushed during that time. Also,
From the air introduction pipe 18 to the air introduction chamber 17 and the bottom cover 2
The air introduced into the chamber 0 flows into the crushing chamber 27 through the clearance 19, the slit or the small hole 15, and reaches the classifier 30 with the powder generated by the crushing. The fines are returned to the crushing chamber 27 again, and the fines are sent to the collecting means via the rotary cylinder 14 and the duct 13.
Collected in the collector.
【0012】また,スリットまたは小孔15あるいはク
リアランス19を通って粉砕室27から抜け出た粒子
は,管路21および投入管12により,粉砕室27内に
戻される。
The particles that have escaped from the crushing chamber 27 through the slits or small holes 15 or the clearance 19 are returned into the crushing chamber 27 by the conduit 21 and the charging pipe 12.
【0013】[0013]
【発明が解決しようとする課題】以上説明したような図
5に示す従来の遠心流動粉砕装置においては,粉砕媒体
はジルコニア,アルミナ,炭化硅素,窒化硅素,鋼球等
が使用されるが,被粉砕物の要求製品の粉末度に応じて
連続運転のほかバッチ運転を行なうこともできる。一般
に比較的処理能力が大きく,かつ,製品粒度がそれほど
苛酷でないものは連続運転とし,処理量が小さくても製
品粒度が非常に小さい製品を得る場合にはバッチ運転に
よる回分操作が必要となる。しかしながら,従来使用さ
れていた運転条件では,例えば図6に示すように,粉砕
時間が80分を越える限界時間taに達すると平均粒径
Dp50は限界粒子径Daに達したあと,それ以上粉砕し
ても凝集が起こって平均粒径が限界粒子径Daより小さ
くならず,要求の製品粒径がこれ以下の製品を得ること
ができないという問題があった。
In the conventional centrifugal flow pulverizer shown in FIG. 5 as described above, zirconia, alumina, silicon carbide, silicon nitride, steel balls and the like are used as a pulverizing medium. Depending on the degree of fineness of the required product of the pulverized material, a batch operation as well as a continuous operation can be performed. Generally, those having a relatively large processing capacity and a product grade not so severe are operated continuously. To obtain a product having a very small product grain size even with a small throughput, batch operation by batch operation is necessary. However, the operating conditions have been conventionally used, for example, as shown in FIG. 6, and the grinding time reaches the limit time t a exceeds the 80 minutes after the average particle size Dp 50 is reaching the limit particle diameter Da, more Even if it is pulverized, agglomeration occurs and the average particle size does not become smaller than the limit particle size Da, and there is a problem that a product having a required product particle size smaller than this cannot be obtained.
【0014】[0014]
【課題を解決するための手段】上に述べた課題を解決し
て、有効な粉砕を行ない所要の超微粉砕品も得られるた
めに、本発明の遠心流動粉砕装置のバッチ運転方法は、
回転軸芯が鉛直方向を向いており、下方に向かって拡径
する円錐形状を有する皿面を有し、かつ、該皿面の縦断
面が中央部から外周部にかけて凹状に湾曲している形状
の回転自在な皿状の回転皿と、少なくとも上部が上方に
向かって縮径する内壁面を有し、該内壁面の縦断面が凹
状に湾曲している形状であり、前記回転皿と同軸的に周
設されて静止した外周環とを具備し、前記回転皿の皿面
と該外周環の内壁面とが、回転皿と外周環との間の微小
隙間を除いて、連続的な円滑面に形成されている遠心流
動粉砕装置の回分操作の運転において、該遠心流動粉砕
装置内に粉砕原料とともに収納する粉砕媒体を、粉砕後
の平均粒径が4μm以上の製品を短時間で得たい場合に
は直径が5〜10mm程度の大径または中径のボールと
し、粉砕後の平均粒径が3〜4μm程度の微粉砕品を短
時間で得たい場合には直径が3〜5mm程度の中径また
は小径のボールとし、粉砕後の平均粒径が3μm未満の
超微粉砕品を得たい場合には直径が3mmもしくはそれ
以下の小径ボールを使用して長時間運転することとし
た。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, to effectively perform pulverization and to obtain a required ultra-fine pulverized product, the batch operation method of the centrifugal fluidized pulverizer according to the present invention comprises:
A shape in which the rotation axis is oriented vertically and has a dish surface having a conical shape whose diameter increases downward, and the longitudinal section of the dish surface is concavely curved from the center to the outer periphery . A rotatable dish-shaped rotating dish, and at least an upper portion having an inner wall surface whose diameter is reduced upward, the longitudinal section of the inner wall surface being concavely curved, and coaxial with the rotating dish. And a stationary outer peripheral ring is provided around the rotating plate, and the counter surface of the rotating plate and the inner wall surface of the outer peripheral ring have a continuous smooth surface except for a minute gap between the rotating plate and the outer peripheral ring. In the operation of the batch operation of the centrifugal fluidized crusher formed in the above, when it is desired to obtain in a short time a product having an average particle size of 4 μm or more after crushing the crushing medium to be stored together with the raw material in the centrifugal fluidized crusher. Has a large or medium diameter ball with a diameter of about 5 to 10 mm, When it is desired to obtain a finely pulverized product having a diameter of about 3 to 4 μm in a short time, use a medium or small diameter ball having a diameter of about 3 to 5 mm, and obtain an ultrafine pulverized product having an average particle size of less than 3 μm after pulverization. If desired, long-term operation was performed using a small-diameter ball having a diameter of 3 mm or less.
【0015】[0015]
【作用】本発明の遠心流動粉砕装置のバッチ運転方法に
おいては,製品平均粒径が大のとき大径または中径ボー
ルで短時間運転し,製品平均粒径が小のときには小径ボ
ールで長時間運転する。そして,製品平均粒径が中間の
3〜4μm程度のときには中径ボールまたは小径ボール
で短時間運転することによって,各々所望のサイズの製
品を得ることができる。
In the batch operation method of the centrifugal fluidized crusher according to the present invention, when the average product particle size is large, the device is operated for a short time with a large or medium diameter ball, and when the product average particle size is small, it is used for a long time with a small ball. drive. When the average particle size of the product is about 3 to 4 μm, which is an intermediate product, a product having a desired size can be obtained by operating for a short time with a medium or small diameter ball.
【0016】[0016]
【実施例】以下図面に基づいて本発明の実施例について
詳細に説明する。図1〜図4は本発明の実施例に係り,
図1は遠心流動粉砕装置の全体縦断面図,図2は遠心流
動粉砕装置の要部縦断面図,図3は運転時間と製品の平
均粒径との相関曲線図,図4はバッチ運転方法の選択指
針説明図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention.
FIG. 1 is an overall longitudinal sectional view of a centrifugal fluidized crusher, FIG. 2 is a longitudinal sectional view of a main part of the centrifugal fluidized crusher, FIG. 3 is a correlation curve diagram of operation time and average particle size of a product, and FIG. FIG.
【0017】図1において,回転皿6は回転皿6の中心
下方に垂設される回転軸2およびカップリング2aを介
して減速機25の出力軸と連結され,可変速電動機26
によって回転駆動される。一方,微小のクリアランス1
9を隔て回転皿6の周囲には柱脚24,架台23を介し
て外周環7が配設され,回転皿6と外周環7とで形成さ
れる空間である粉砕室27では,従来技術で述べたよう
に構成され原料は粉砕媒体による遠心流動粉砕作用を受
け,微粉砕または超微粉砕される。外周環7の上部には
天板40aを有する帽子状の円筒管40が載置され外周
環7に連結される。円筒管40の中間には複数個の透孔
44を有する水平円板からなる仕切板42が固設され,
透孔44にはバッグフィルタエレメント50が仕切板4
2の下方に形成される分級室47に突出垂下されるよう
に配設される。また,透孔44の上方にはベンチュリ管
46が設けられ,ベンチュリ管46の上にはバッグフィ
ルタエレメント50の内面へ圧縮エアを吹付けるための
圧縮エア供給管60が機外から導かれ,吹出しノズル6
0aがベンチュリ管46に対向配置される。円筒管40
の天板40a中央には含塵ガスの排出管48が設けられ
る。以上のように構成された可変速電動機26,減速機
25および柱脚24は共通ベース100の上面に固設さ
れる。本発明の遠心流動粉砕装置1は間欠運転(バッチ
操作)と連続運転がともに可能で汎用性が広い。バッチ
運転を行なうときには,装置内への吸入空気量はクリア
ランス19から粉砕微粉が漏洩しない程度に少なく留
め,バッグフィルタエレメント50の篩目は微粉を逃が
さないよう極微小のものを採用する。
In FIG. 1, the rotating plate 6 is connected to an output shaft of a speed reducer 25 via a rotating shaft 2 and a coupling 2a vertically provided below the center of the rotating plate 6, and a variable speed motor 26 is provided.
Is driven to rotate. On the other hand, small clearance 1
An outer peripheral ring 7 is disposed around the rotating plate 6 with a column 9 and a base 23 interposed therebetween, and a pulverizing chamber 27 which is a space formed by the rotating plate 6 and the outer peripheral ring 7 is formed by a conventional technique. As described above, the raw material is subjected to the centrifugal flow pulverizing action of the pulverizing medium and is pulverized or ultra-pulverized. A cap-shaped cylindrical tube 40 having a top plate 40 a is placed on the upper part of the outer peripheral ring 7 and connected to the outer peripheral ring 7. A partition plate 42 made of a horizontal disk having a plurality of through holes 44 is fixedly provided in the middle of the cylindrical tube 40.
The bag filter element 50 is provided in the through hole 44 with the partition plate 4.
2 is disposed so as to protrude and drop into a classifying chamber 47 formed below. Further, a venturi tube 46 is provided above the through hole 44, and a compressed air supply tube 60 for blowing compressed air to the inner surface of the bag filter element 50 is guided from outside the venturi tube above the venturi tube 46. Nozzle 6
Oa is disposed to face the Venturi tube 46. Cylindrical tube 40
An exhaust pipe 48 for dust-containing gas is provided at the center of the top plate 40a. The variable speed motor 26, the speed reducer 25, and the column base 24 configured as described above are fixed to the upper surface of the common base 100. The centrifugal flow pulverizer 1 of the present invention can perform both intermittent operation (batch operation) and continuous operation, and has wide versatility. When a batch operation is performed, the amount of intake air into the apparatus is kept small so as not to allow the pulverized fine powder to leak from the clearance 19, and the sieve of the bag filter element 50 is of a very small size so as not to allow the fine powder to escape.
【0018】以上のように構成された本発明の作動につ
いて説明する。あらかじめ,粉砕室27内には,たとえ
ば,球状のボールからなる粉砕媒体が多数装入されてい
る。まず,粉砕原料を図示しない投入管から装置内に投
入する。回転皿6の回転に伴って粉砕原料および粉砕媒
体は外周環7の内壁面7aと皿面6aとを循環する円運
動(矢印S)と,回転皿6の軸心回りの公転運動との合
成による縄を綯うような螺旋運動(遠心流動)を行な
い,その間で粉砕原料の摩砕または剥ぎ取りを行なう。
すなわち,回転皿6を回転させると,粉砕媒体は遠心力
により外周方向に移動され,この速度エネルギによって
外周環7の内壁面7aを這い上がり,その這い上がる力
が重力より小さくなった時点で該内壁面7aから離れて
回転皿6の皿面6a上に落下する。皿面6a上に移動し
た粉砕媒体はこの皿面6aに沿って再び外周環7へ向け
て移動される。
The operation of the present invention configured as described above will be described. In the grinding chamber 27, for example, a large number of grinding media made of, for example, spherical balls are charged. First, a pulverized raw material is charged into the apparatus from a charging pipe (not shown). As the rotating plate 6 rotates, the raw material and the grinding medium are combined with a circular motion (arrow S) circulating between the inner wall surface 7a of the outer peripheral ring 7 and the plate surface 6a, and a revolving motion around the axis of the rotating plate 6. A spiral motion (centrifugal flow) is performed as if twisting a rope by, while grinding or stripping of the pulverized raw material is performed.
That is, when the rotating plate 6 is rotated, the crushing medium is moved in the outer peripheral direction by centrifugal force, and crawls up the inner wall surface 7a of the outer peripheral ring 7 by this velocity energy. It separates from the inner wall surface 7a and falls on the plate surface 6a of the rotating plate 6. The crushed medium that has moved onto the dish surface 6a is again moved toward the outer peripheral ring 7 along the dish surface 6a.
【0019】また,回転皿6を回転させると,粉砕媒体
は回転皿6の回転速度よりも遅い速度で円周方向に公転
する。したがって,粉砕媒体は,前述のように皿面6a
と内壁面7aを循環する上下方向の円運動Sの他に,回
転皿6の軸心回りを回転する公転運動をも行ない,これ
らの二つの運動を合成した縄を綯うような螺旋進行運動
(遠心流動)を行なう。
When the rotating plate 6 is rotated, the grinding medium revolves in the circumferential direction at a speed lower than the rotating speed of the rotating plate 6. Therefore, the grinding medium is applied to the dish surface 6a as described above.
In addition to the vertical circular movement S circulating through the inner wall surface 7a and the inner wall surface 7a, it also performs a revolving motion that rotates around the axis of the rotating plate 6, and performs a spiral traveling motion such as a twine that combines these two motions. Centrifugal flow).
【0020】このように,粉砕媒体は回転皿6の円周方
向への運動を維持しつつ内壁面7aを這い上がる運動を
行なうのであるが,この内壁面7aが固定されていると
き,粉砕媒体の円周方向速度(公転速度)および粉砕媒
体の這い上がり速度との合成速度がそのまま内壁面7a
と粉砕媒体の速度差になる。したがって,粉砕媒体と内
壁面7aとの速度差は極めて大きなものとなり,内壁面
7a上を移動する際の粉砕媒体の作用による摩砕作用は
著しく強いものとなる。
As described above, the crushing medium moves up the inner wall surface 7a while maintaining the movement of the rotating plate 6 in the circumferential direction. When the inner wall surface 7a is fixed, the crushing medium is moved. Of the inner wall surface 7a as it is with the circumferential speed (revolution speed) and the speed at which the pulverizing medium rises.
And the speed of the grinding media. Therefore, the speed difference between the crushing medium and the inner wall surface 7a becomes extremely large, and the grinding action by the action of the crushing medium when moving on the inner wall surface 7a becomes extremely strong.
【0021】さらに,内壁面7aから離脱して皿面6a
上に着床した粉砕媒体は,この皿面6aに沿って滑らか
に転がり落ちるので,皿面6aを転動降下する際の運動
により,内壁面7aを駆け上がる際に得た位置エネルギ
を半径方向への運動エネルギに変換することができるか
ら,粉砕媒体に一旦付与されたエネルギをいたずらに消
費することなく,剥離作用に有効に利用することができ
る。さらに,皿面6aに沿って降下する際は,粉砕媒体
はこの皿面6aと摺動するから,この降下運動中におい
ても摩砕または剥離が行なわれる。
Further, the plate surface 6a is detached from the inner wall surface 7a.
Since the grinding medium that has landed on the upper surface smoothly rolls down along the plate surface 6a, the potential energy obtained when running up the inner wall surface 7a by the movement when rolling down the plate surface 6a is used in the radial direction. Since the kinetic energy can be converted into the kinetic energy, the energy once applied to the pulverizing medium can be effectively used for the peeling action without unnecessarily consuming the energy. Further, when descending along the plate surface 6a, the grinding medium slides on the plate surface 6a, so that grinding or peeling is performed even during this descending movement.
【0022】図3に示すものは,運転時間(粉砕時間)
tと製品の平均粒径Dp50との相関関係を示し,熔融シ
リカの砕料(出発粒径82μm)を回転皿直径が400
mmの遠心流動粉砕装置で回転数500rpmでバッチ
運転による粉砕を実施した場合の結果を示す。粉砕媒体
は各々10mm,5mm,3mmの単一ジルコニアボー
ルを使用した。図3によると,図6で説明した10mm
ボールの凝集現象(限界時間ta に限界粒子径Daに達
する)と同様に,5mmボールの場合にも粉砕時間t=
60分のときに凝集が起こり,その後粉砕を実施しても
平均粒子径Dp 50は低下せず,むしろ増大する。一方,
3mmボールの場合にはかなり長時間のバッチ運転でも
凝集は見られず平均粒子径Dp50は単調に減少する。
FIG. 3 shows the operation time (crushing time)
t and the average particle size Dp of the product50Shows a correlation with
Rica crushing material (starting particle size 82 μm) with a rotating dish diameter of 400
batch at 500rpm with centrifugal fluidized grinding machine
The result in the case of performing pulverization by operation is shown. Grinding media
Is a single zirconia boad of 10mm, 5mm and 3mm respectively
Used. According to FIG. 3, 10 mm described in FIG.
Ball aggregation phenomenon (limit time ta Reaches the critical particle size Da
Similarly to the case of 5 mm ball, the grinding time t =
Agglomeration occurs at 60 minutes, and even after grinding,
Average particle diameter Dp 50Does not decrease, but rather increases. on the other hand,
In the case of 3mm balls, even for a very long batch operation
No aggregation was observed and the average particle diameter Dp50Decreases monotonically.
【0023】以上のような傾向は,熔融シリカ以外の他
の砕料(アルミナ,窒化硅素,タルク等)にも同様に見
られ,汎用性があるものと考えられる。そこで,図4に
示すように,これらの特性よりバッチ運転においては,
砕料の種類,処理能力,所望の製品粒度等を考慮して粉
砕媒体のボール径や運転時間を決定する。まず,製品平
均粒径が,たとえば,5〜8μmなど4μm以上の製品
を得る場合には従来使用されていた10mmボールや5
mmボールでも20分程度の短時間に粉砕され,処理能
力も大きい。一方,製品平均粒径が3〜4μm程度の中
級品を得たいときには5mmボールや3mmボールで4
0〜60分程度の短時間の粉砕を行なう。また,製品平
均粒径が3μm未満の超微粉砕品を得る場合には凝集を
起こし難い小径のボール,たとえば,3mmボールやそ
れ以下のボールで100分以上の長時間運転を実施す
る。
The above tendency is also observed in other crushing materials (alumina, silicon nitride, talc, etc.) other than fused silica, and is considered to have versatility. Therefore, as shown in FIG.
The ball diameter and operation time of the grinding media are determined in consideration of the type of the crushing material, the processing capacity, the desired product particle size, and the like. First, in order to obtain a product having an average particle size of 4 μm or more, for example, 5 to 8 μm, a conventional 10 mm ball or 5 mm is used.
Even a 20 mm ball is pulverized in a short time of about 20 minutes and has a large processing capacity. On the other hand, when it is desired to obtain an intermediate product having an average product particle size of about 3 to 4 μm, use a 5 mm ball or a 3 mm ball.
Pulverization is performed for a short time of about 0 to 60 minutes. In order to obtain an ultrafine pulverized product having an average product particle size of less than 3 μm, a ball having a small diameter that is unlikely to cause agglomeration, for example, a 3 mm ball or less, is operated for a long time of 100 minutes or more.
【0024】なお,砕料によっては図3に示す特性曲線
が幾分上下にスライドされるので,粉砕頻度の多い砕料
や所望粒度の許容幅の小さい砕料については,事前にテ
スト運転し,データを収集整理しておくことが望まし
い。
Since the characteristic curve shown in FIG. 3 is slid up and down somewhat depending on the crushing material, a crushing material having a high crushing frequency and a crushing material having a small allowable width of a desired particle size are subjected to a test operation in advance. It is desirable to collect and organize data.
【0025】本発明のバッチ運転方法は,遠心流動粉砕
装置における粉砕媒体ボール径と製品平均粒径との相関
関係における特性を十分把握してそれに適合した運転を
行なうので,効率の良い粉砕が実施され,所望の粒度の
製品を必要最小限度の時間で得られる。
In the batch operation method of the present invention, since the characteristics in the correlation between the grinding media ball diameter and the product average particle size in the centrifugal fluidized grinding device are sufficiently grasped and the operation is adapted to the characteristics, efficient grinding can be performed. As a result, a product having a desired particle size can be obtained in a minimum necessary time.
【0026】[0026]
【発明の効果】以上述べたように,本発明のバッチ運転
方法では,適正なボール径の粉砕媒体を選択し,効率の
良い運転が実施されるため所要粒度の製品を速やかに得
ることができる。
As described above, according to the batch operation method of the present invention, a pulverizing medium having an appropriate ball diameter is selected, and efficient operation is performed, so that a product having a required particle size can be obtained quickly. .
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の実施例に係る遠心流動粉砕装置の全体
縦断面図である。
FIG. 1 is an overall vertical cross-sectional view of a centrifugal fluidized crusher according to an embodiment of the present invention.
【図2】本発明の実施例に係る遠心流動粉砕装置の要部
縦断面図である。
FIG. 2 is a longitudinal sectional view of a main part of a centrifugal fluidized-pulverizing apparatus according to an embodiment of the present invention.
【図3】本発明の実施例に係るバッチ運転における運転
時間と製品の平均粒径との相関曲線図である。
FIG. 3 is a diagram showing a correlation curve between an operation time and an average particle size of a product in a batch operation according to an example of the present invention.
【図4】本発明の実施例に係るバッチ運転方法の運転指
針説明図である。
FIG. 4 is an explanatory diagram of an operation guideline of a batch operation method according to an embodiment of the present invention.
【図5】従来の遠心流動粉砕装置の要部縦断面図であ
る。
FIG. 5 is a vertical cross-sectional view of a main part of a conventional centrifugal flow pulverizer.
【図6】従来の遠心流動粉砕装置のバッチ運転における
運転時間と製品の平均粒径との相関曲線図である。
FIG. 6 is a diagram showing a correlation curve between the operation time and the average particle size of a product in a batch operation of a conventional centrifugal fluidized grinding device.
【符号の説明】[Explanation of symbols]
1 遠心流動粉砕装置 2 回転軸 6 回転皿 6a 皿面 7 外周環 7a 内壁面 18 空気導入管 19 クリアランス 27 粉砕室 40 円筒管 40a 天板 40b 円筒管 40c 蓋 40d 丁番 42 仕切板 44 透孔 46 ベンチュリ管 47 分級室 48 排出管 50 バッグフィルタエレメント 60 圧縮エア供給管 60a 吹出しノズル 100 共通ベース S 円運動 A 単一ボール Dp50 平均粒径 Da 限界粒子径 ta 限界時間DESCRIPTION OF SYMBOLS 1 Centrifugal fluid crushing apparatus 2 Rotating shaft 6 Rotating dish 6a Dish surface 7 Outer ring 7a Inner wall surface 18 Air introduction pipe 19 Clearance 27 Grinding chamber 40 Cylindrical pipe 40a Top plate 40b Cylindrical pipe 40c Cover 40d Hinge 42 Partition plate 44 Through hole 46 venturi tube 47 classifying chamber 48 blowout discharge pipe 50 bag filter element 60 compressed air supply pipe 60a nozzle 100 common base S circular A single ball Dp 50 average particle diameter Da limit particle diameter t a time limit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) B02C 17/00 - 17/20──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) B02C 17/00-17/20

Claims (1)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 回転軸芯が鉛直方向を向いており、下方
    へ向かって拡径する円錐形状を有する皿面を有し、か
    つ、該皿面の縦断面が中央部から外周部にかけて凹状に
    湾曲している形状の回転自在な皿状の回転皿と、少なく
    とも上部が上方に向かって縮径する内壁面を有し、該内
    壁面の縦断面が凹状に湾曲している形状であり、前記回
    転皿と同軸的に周設されて静止した外周環とを具備し、
    前記回転皿の皿面と該外周環の内壁面とが、回転皿と外
    周環との間の微小隙間を除いて、連続的な円滑面に形成
    されている遠心流動粉砕装置の回分操作の運転におい
    て、 該遠心流動粉砕装置内に粉砕原料とともに収納する粉砕
    媒体を、 粉砕後の平均粒径が4μm以上の製品を短時間で得たい
    場合には直径が5〜10mm程度の大径または中径のボ
    ールとし、 粉砕後の平均粒径が3〜4μm程度の微粉砕品を短時間
    で得たい場合には直径が3〜5mm程度の中径または小
    径のボールとし、 粉砕後の平均粒径が3μm未満の超微粉砕品を得たい場
    合には直径が3mmもしくはそれ以下の小径ボールを使
    用して長時間運転する遠心流動粉砕装置のバッチ運転方
    法。
    1. A rotating shaft center is oriented in a vertical direction, has a conical dish surface which expands in diameter downward, and a longitudinal section of the dish surface is concave from a central portion to an outer peripheral portion. A rotatable dish-shaped rotating dish having a curved shape, and at least an upper portion having an inner wall surface whose diameter is reduced upward, and a vertical cross section of the inner wall surface having a concavely curved shape, An outer peripheral ring which is provided coaxially around the rotating plate and is stationary,
    Batch operation of the centrifugal fluidized crusher in which the plate surface of the rotating plate and the inner wall surface of the outer peripheral ring are formed in a continuous smooth surface except for a minute gap between the rotating plate and the outer peripheral ring. In the case where it is desired to obtain a product having an average particle size of 4 μm or more after grinding in a short time, a grinding medium stored in the centrifugal fluidized grinding device together with the grinding material, a large or medium diameter having a diameter of about 5 to 10 mm. When it is desired to obtain a finely pulverized product having an average particle size of about 3 to 4 μm in a short period of time, use a medium or small diameter ball of about 3 to 5 mm. A batch operation method of a centrifugal fluidized pulverizer that operates for a long time using a small-diameter ball having a diameter of 3 mm or less when an ultra-fine pulverized product of less than 3 μm is desired.
JP24372892A 1992-09-11 1992-09-11 Batch operation method of centrifugal fluidized crusher Expired - Fee Related JP2790228B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24372892A JP2790228B2 (en) 1992-09-11 1992-09-11 Batch operation method of centrifugal fluidized crusher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24372892A JP2790228B2 (en) 1992-09-11 1992-09-11 Batch operation method of centrifugal fluidized crusher

Publications (2)

Publication Number Publication Date
JPH0691189A JPH0691189A (en) 1994-04-05
JP2790228B2 true JP2790228B2 (en) 1998-08-27

Family

ID=17108111

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24372892A Expired - Fee Related JP2790228B2 (en) 1992-09-11 1992-09-11 Batch operation method of centrifugal fluidized crusher

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Country Link
JP (1) JP2790228B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2825074B2 (en) * 1995-10-25 1998-11-18 日本電気株式会社 Method for manufacturing semiconductor device
JP3231645B2 (en) 1997-01-16 2001-11-26 日本電気株式会社 Semiconductor device and method of manufacturing the same

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Publication number Publication date
JPH0691189A (en) 1994-04-05

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