EP0475015B1 - Verfahren und Vorrichtung zum kontinuierlichen Feinzerkleinern und Dispergieren von Feststoffen in Flüssigkeit - Google Patents

Verfahren und Vorrichtung zum kontinuierlichen Feinzerkleinern und Dispergieren von Feststoffen in Flüssigkeit Download PDF

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Publication number
EP0475015B1
EP0475015B1 EP91111672A EP91111672A EP0475015B1 EP 0475015 B1 EP0475015 B1 EP 0475015B1 EP 91111672 A EP91111672 A EP 91111672A EP 91111672 A EP91111672 A EP 91111672A EP 0475015 B1 EP0475015 B1 EP 0475015B1
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EP
European Patent Office
Prior art keywords
zone
grinding
region
grinding zone
flow
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 - Lifetime
Application number
EP91111672A
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German (de)
English (en)
French (fr)
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EP0475015A1 (de
Inventor
Gerhard Dipl.-Ing. Bühler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FrymaKoruma AG
Original Assignee
Fryma Maschinen AG
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/166—Mills in which a fixed container houses stirring means tumbling the charge of the annular gap type

Definitions

  • the invention relates to a process for the continuous grinding and dispersing of solids in liquid, using grinding aids which, together with the solid-liquid mixture, pass through at least one gap-shaped grinding zone from its inlet side to its outlet side and then by centrifugal force via a return zone from the outlet side are returned to the inlet side of the grinding zone, while at least a substantial part of the solid-liquid mixture is discharged against an centrifugal force via an outflow zone.
  • the invention further relates to an apparatus for performing this method.
  • DE-A 1 223 236 discloses an agitator mill in which, in addition to the agitator consisting of agitator disks, the outer grinding trough also rotates.
  • the mass of grinding media located in the grinding trough is thrown against the outer wall of the rotating grinding trough by the centrifugal forces and can essentially neither move radially nor axially there.
  • the grinding effect in contrast to a device in which the grinding media is circulating, is significantly lower.
  • a device which contains a slit-shaped grinding zone which is penetrated from its inlet side to its outlet side by a solid-liquid mixture and by auxiliary grinding bodies. Furthermore, a return zone which returns the grinding auxiliary bodies by centrifugal force from the outlet side to the inlet side of the grinding zone is provided, at least a substantial part of the solid-liquid mixture is discharged against the effect of centrifugal force via an outflow zone.
  • the entire flow space of the grinding zone and the outflow zone is delimited by an outer fixed wall and an inner circumferential wall.
  • the auxiliary grinding bodies are separated from the solid-liquid mixture by centrifugal force and are returned via the return zone to the inlet side of the grinding zone.
  • a certain proportion of the auxiliary grinding bodies with the solid-liquid mixture are dragged into the outflow zone.
  • GB-A 2 016 953 which describes a similar device, contains, as a variant, the proposal either to drive the usually fixed mill housing (instead of the displacement body) rotatably or to drive both the mill housing and the displacement body rotatably, in each case in the opposite direction of rotation.
  • US Pat. No. 3,202,364 is a ball mill whose ring-cylindrical grinding chamber filled with grinding media is delimited by two drum walls, which in operation are either driven at different speeds in the same or opposite direction or only one of which rotates while the other is standing .
  • the regrind is fed to the ring-cylindrical grinding chamber at one axial end and flows out at the other axial end, the grinding balls passing through a sieve-like configuration of the inner drum is prevented from leaving the grinding chamber.
  • the invention is based on the object of developing a method of the type mentioned at the outset or a device for carrying out this method in such a way that the separation of the auxiliary grinding bodies from the solid-liquid mixture in the region of the flow space in which the return zone and the outflow zone begin connect the grinding zone is improved
  • This object is achieved in that at least the walls of the flow space, in which the return zone and the outflow zone connect to the grinding zone, rotate in the same direction, but at different speeds.
  • This device essentially contains a gap-shaped grinding zone 1, through which a solid-liquid mixture and grinding aids are penetrated from its inlet side 1a to its outlet side 1b. Furthermore, a return zone, designed as a return channel 2 and returning the auxiliary grinding bodies 18 by centrifugal force from the outlet side 1b to the inlet side 1a of the grinding zone 1, is provided.
  • the grinding zone 1 is connected on its inlet side 1a to an inflow zone 3, while an outlet zone 4 is connected to the outlet side 1b.
  • the grinding zone 1, the inflow zone 3 and the outflow zone 4 are delimited by the inner surface of an outer rotor 5 and the outer surface of an inner rotor 6, the outer and inner rotors 5, 6 having a common axis of rotation 7.
  • the outer and inner rotors 5, 6 are driven by pulleys 8, 9 in the same direction, but at different speeds.
  • the inflow zone 3 is connected via channels 10 to a feed pipe 11, the central axis of which coincides with the axis of rotation 7.
  • the outflow zone 4 is connected via channels 12 to a discharge pipe 13 arranged concentrically with the feed pipe 11.
  • the outer rotor 5 is surrounded by a cooling zone 14 which has a cooling water supply 14a and a cooling water discharge 14b.
  • the direction of flow of the cooling water is shown in FIG. 1 with the arrows 15.
  • the entire device is attached to a housing frame 16.
  • the return duct 2 runs obliquely outwards from the end face 6b of the inner rotor 6 facing the outlet side 1b of the grinding zone 1 to the end face 6a of the inner rotor facing the inlet side 1a of the grinding zone 1 6.
  • the angle which the return duct 2 forms with the axis of rotation 7 is between 10 to 70 °, preferably between 30 to 60 °.
  • the inflow zone 3, the grinding zone 1 and the adjoining part of the outflow zone 4 is designed in the form of an annular gap.
  • the return zone is formed by one or more return channels 2.
  • the inner rotor 6 accordingly has a wavy surface formation in the third region 1c of the grinding zone 1.
  • FIG. 6 shows a section through the outer rotor 5 along the line VI-VI of FIG.
  • the surface facing the outflow zone 4 likewise has an undulating surface configuration.
  • FIG. 3 shows a sectional partial view of a second exemplary embodiment.
  • the same reference numerals are used here for the same parts.
  • FIG. 4 shows a sectional partial view of a third exemplary embodiment.
  • This third exemplary embodiment differs from the second exemplary embodiment according to FIG. 3 essentially only in the configuration of its third region 1e, which extends at least approximately in the shape of an arc in a sloping manner towards the inside.
  • the solid-liquid mixture is introduced into the inflow zone 3 from a pump (not shown) via the feed pipe 11.
  • the direction of flow of the solid-liquid mixture is shown by the arrows 17.
  • the solid-liquid mixture is mixed with auxiliary grinding bodies 18, which bring about continuous fine comminution and dispersion of the solids in the liquid in the grinding zone 1 to the outlet side 1b.
  • the grinding media are carried along from the inlet side 1a to the outlet side 1b and are then returned against the flow by centrifugal force from the outside 1b to the inlet side 1a of the grinding zone 1.
  • at least a substantial part of the solid-liquid mixture is discharged via the outflow zone 4 against the effect of centrifugal force.
  • the solution according to the invention results in a centrifugal force that is many times higher because, in addition to the inner rotor 6, the outer rotor 5 is also driven in the same direction.
  • the rotor is driven at a speed of 1,500 rpm while the other wall of the grinding zone is stationary as a stator, this results in an average rotation speed of 750 rpm for the solid-liquid mixture with the auxiliary grinding bodies.
  • the speeds of the rotors must also be adjusted to the mass of the auxiliary grinding bodies and the strength of the flow of the solid-liquid mixture.
  • it must be ensured that the auxiliary grinding bodies in a kind of circulation in the grinding zone 1 and Circulate return channel 2 and are not held by an excessive centrifugal force in an area of the grinding zone with the greatest radial distance from the axis of rotation 7.
  • the centrifugal force, in particular in the return channel 2 must be so great that the auxiliary grinding bodies are separated from the solid-liquid mixture against the flow of the latter.
  • the speeds at which the two rotors 5, 6 - and thus also the walls of the flow space in which the return zone (return channel 2) and the outflow zone 4 connect to the grinding zone 1 - are expediently between 500 and 20,000 rpm, preferably between 1,000 and 5,000 rpm.
  • the difference in the peripheral speeds of the two walls delimiting the grinding zone 1 is expediently between 5 and 20 m / s, preferably between 8 and 15 m / s.
  • the size of the centrifugal forces in the flow space in which the return zone (return channel 2) and the outflow zone 4 connect to the grinding zone 1, or in the entire grinding zone 1, can be determined, on the one hand, by the speeds of the two rotors 5, 6 and, on the other hand, by the Set the constructive radial distance of these areas from the axis of rotation 7.
  • the auxiliary grinding bodies 18 are constantly kept in motion, so that a good grinding effect is thereby achieved.
  • This effect is additionally reinforced by surface profiling on the walls delimiting the grinding zone 1 and by the grinding zone 1 kinking several times at an acute or obtuse angle.
  • the diameter range of the auxiliary grinding bodies can be, for example, between 0.1 and 0.5 mm. Even with grinding aids of this size, the mass forces are so great that an effectively high grinding effect is achieved.
  • the solution according to the invention can also be implemented in devices in which - similar to the design according to DE-A-37 16 295 - several grinding zones (each provided with an inflow zone, outflow zone and return zone) are connected in series.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
EP91111672A 1990-09-14 1991-07-12 Verfahren und Vorrichtung zum kontinuierlichen Feinzerkleinern und Dispergieren von Feststoffen in Flüssigkeit Expired - Lifetime EP0475015B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4029252A DE4029252A1 (de) 1990-09-14 1990-09-14 Verfahren und vorrichtung zum kontinuierlichen feinzerkleinern und dispergieren von feststoffen in fluessigkeit
DE4029252 1990-09-14

Publications (2)

Publication Number Publication Date
EP0475015A1 EP0475015A1 (de) 1992-03-18
EP0475015B1 true EP0475015B1 (de) 1994-06-22

Family

ID=6414292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111672A Expired - Lifetime EP0475015B1 (de) 1990-09-14 1991-07-12 Verfahren und Vorrichtung zum kontinuierlichen Feinzerkleinern und Dispergieren von Feststoffen in Flüssigkeit

Country Status (6)

Country Link
EP (1) EP0475015B1 (da)
JP (1) JPH0669539B2 (da)
AT (1) ATE107543T1 (da)
DE (2) DE4029252A1 (da)
DK (1) DK0475015T3 (da)
ES (1) ES2056528T3 (da)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4402609C2 (de) * 1994-01-28 1997-05-07 Hosokawa Alpine Ag Rührwerkskugelmühle
DE19835555B4 (de) * 1998-08-06 2007-10-04 Bühler AG Verfahren und Vorrichtung zum Nassmahlen und Dispergieren von Feststoffpartikeln in Flüssigkeiten
JP4451965B2 (ja) * 2000-05-18 2010-04-14 株式会社井上製作所 パイプラインビ−ズミル
KR101676298B1 (ko) * 2016-05-04 2016-11-15 주식회사 씨케이머티리얼즈랩 재분산성이 향상된 자기유변유체 평가방법
JP6919940B1 (ja) * 2020-06-22 2021-08-18 淺田鉄工株式会社 分散装置
JP6862020B1 (ja) * 2020-06-22 2021-04-21 淺田鉄工株式会社 分散システム
CN113289731B (zh) * 2021-05-20 2023-07-18 博亿(深圳)工业科技有限公司 一种多种分散速度的研磨系统及方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE624266A (da) * 1961-11-03
DE2811899C2 (de) * 1978-03-18 1984-12-06 Fryma-Maschinen Ag, Rheinfelden Spalt-Kugelmühle
DD146394A1 (de) * 1979-10-15 1981-02-11 Robert Habel Vorrichtung zum intensiven vermischen feinkoerniger feststoffe mit fluessigkeiten
DD272039A1 (de) * 1987-05-11 1989-09-27 Nagema Veb K Einrichtung zur herstellung von feinteiligen dispersionen
DE3716295A1 (de) * 1987-05-15 1988-11-24 Fryma Maschinenbau Gmbh Spalt-kugelmuehle zum kontinuierlichen feinzerkleinern, insbesondere aufschliessen von mikroorganismen und dispergieren von feststoffen in fluessigkeit

Also Published As

Publication number Publication date
DE59101995D1 (de) 1994-07-28
EP0475015A1 (de) 1992-03-18
JPH04247248A (ja) 1992-09-03
DE4029252A1 (de) 1992-03-19
ATE107543T1 (de) 1994-07-15
DK0475015T3 (da) 1994-11-07
JPH0669539B2 (ja) 1994-09-07
ES2056528T3 (es) 1994-10-01

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