EP0362525A2 - Procédé et dispositif pour le brayage à froid - Google Patents

Procédé et dispositif pour le brayage à froid Download PDF

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Publication number
EP0362525A2
EP0362525A2 EP89115154A EP89115154A EP0362525A2 EP 0362525 A2 EP0362525 A2 EP 0362525A2 EP 89115154 A EP89115154 A EP 89115154A EP 89115154 A EP89115154 A EP 89115154A EP 0362525 A2 EP0362525 A2 EP 0362525A2
Authority
EP
European Patent Office
Prior art keywords
refrigerant
grinding
sump
fluidized bed
grinding chamber
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.)
Granted
Application number
EP89115154A
Other languages
German (de)
English (en)
Other versions
EP0362525B1 (fr
EP0362525A3 (fr
Inventor
Klaus Bochmann
Hans Joachim Risto
Wolfgang Volker
Helmut Gursky
Dieter Steidl
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT89115154T priority Critical patent/ATE103208T1/de
Publication of EP0362525A2 publication Critical patent/EP0362525A2/fr
Publication of EP0362525A3 publication Critical patent/EP0362525A3/fr
Application granted granted Critical
Publication of EP0362525B1 publication Critical patent/EP0362525B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/37—Cryogenic cooling

Definitions

  • the invention relates to a method and a device for cold grinding in a fluidized bed counter jet mill.
  • Jet mills have long been known comminution machines in which the particles to be comminuted are accelerated by gas flows and comminuted by collision. There are a number of different jet mill designs. They differ in the type of gas flow, the type of Impact of the particles against each other or on an impact surface and thereby whether the particles to be comminuted are carried along in the gas jet or whether the gas jet hits the particles and entrains them. Air or superheated steam is usually used as the grinding gas.
  • the fluidized bed counter jet mill In the fluidized bed counter jet mill, freely expanding gas jets meet in a grinding chamber in which the material to be ground is in the form of a fluidized bed. The grinding is carried out practically exclusively by impact of the regrind particles against one another, the grinding is thus almost wear-free.
  • the fluidized bed counter jet mill is assigned a classifier, in which the fine material obtained is separated from the coarse material which has not yet been comminuted sufficiently. The coarse material is returned to the grinding chamber.
  • the propellant gas stream is therefore cooled, as described, for example, in DE-OS 21 33 019.
  • the cooling of the propellant gas stream makes it possible to grind materials that would not be grindable in jet mills under normal conditions.
  • intensive cooling for example with liquid nitrogen
  • the self-cooling of the propellant gas stream due to its expansion the achievable improvement in grindability leaves much to be desired.
  • fine Reach grain sizes but only with an extremely high expenditure of time and energy.
  • the invention is therefore based on the object of providing a method and a device for cold grinding which require little energy and refrigerant and at the same time enable the fine grinding of products to finest grain sizes which have hitherto been practically unattainable with a substantial increase in throughput.
  • the invention is therefore based on the idea of not cooling the propellant gas flow, but rather the coarse material circulating with a cryogenic refrigerant.
  • the measure according to the invention brings about a sudden improvement in the grinding results, as can be seen from the operating results set out below.
  • the invention enables a considerable increase in throughput to be achieved on fluidized bed counter-jet mills.
  • the end product is easy to pour and has a high bulk and bulk weight.
  • materials that are tough, rubber table, sticky or greasy can be excellently ground using the method according to the invention.
  • These are primarily natural products, many pharmaceutical products, thermoplastics, waxes and high-molecular plastics.
  • Liquefied gases, especially nitrogen, are primarily considered as refrigerants, but also carbon dioxide. In the simplest and in many cases the most practical case, these can be fed directly into the bottom of the mill. Indirect cooling of the coarse material is of course also possible. Indirect cooling can also take place using other refrigerants, for example brine baths.
  • the mill shows a fluidized bed counter jet mill in schematic form.
  • the mill consists of a housing 1 which comprises the grinding chamber 2 and the sump 3.
  • the propellant gas enters the grinding chamber 2 through the nozzles 4.
  • the classifier 5 connects to the housing 1.
  • the coarse material to be ground is in the form of a fluidized bed 6 in the grinding chamber.
  • the regrind is metered in through the lock 7.
  • the fine material 10 separated in the classifier 5 is drawn off through the fine material outlet 8, as indicated by the arrow 9, and fed to the filter system 15. This has a connection 16 for the exhaust gas and a removal lock 17 for the fine material 10 obtained.
  • the coarse material 11 flows from the classifier 5 back into the grinding chamber 2.
  • the propellant gas, with which the nozzles 4 are acted on, is brought in through the supply line 14.
  • the coarse material located in the sump 3 of the mill is cooled by liquid nitrogen. This is introduced through the line 12 and the porous entry body 13. Porous feed grains are particularly suitable for small mills. For grinders with larger diameters, other feed systems, for example nozzle plates, are preferred in order to be able to feed the nitrogen in as finely divided as possible.
  • the nitrogen supply through line 12 and the porous Entry body 13 takes place depending on the temperature control 18.
  • the regrind can be fed through the lock 7 directly into the sump 3.
  • the fine fraction of the fine material 10 is determined by the speed of the classifier 5.
  • the coarse material 11 flowing back from the classifier 5 forms, together with the mill material entering from the lock 7, the fluidized bed 6.
  • the liquid nitrogen entering through the porous feed body 13 evaporates and cools the sump of the mill, ie the coarse material 11 flowing back from the classifier 5 and possibly freshly applied mill material .
  • the evaporated cold nitrogen is drawn upwards through the material and enters the grinding zone.
  • Cold gas, coarse material and regrind form a first fluidized bed zone below the grinding chamber 2 in the sump 3.
  • FIG. 2 shows in schematic form the lower part of the fluidized bed counter-jet mill from FIG. 1, but with the lock 7 for the regrind arranged directly on the sump 3.
  • the arrows 19 illustrate the mixture of cold gas, propellant gas, coarse material and fine material which is drawn off towards the classifier.
  • the liquid nitrogen is supplied through lines 20 and 21.
  • the liquid nitrogen entering through line 21 passes into a double-walled tube 22 closed at the end faces.
  • This double-walled tube 22 has outlet openings 23 directed inwards.
  • the entire lower part of the mill housing is also designed as a double-walled chamber 24.
  • the line 20 opens into it.
  • the chamber 24 has outlet openings 25 arranged in the sump 3 for the nitrogen supplied through the line 20.
  • the coarse material 11 flowing back from the classifier is therefore first indirectly cooled in the area between the double-walled tube 22 and the chamber 24. Then there is direct cooling by the nitrogen emerging from the outlet openings 23 and 25. Depending on the mode of operation, this can still be liquid or already gaseous.
  • FIG. 4 shows an embodiment similar to FIG. 2, but with an elongated sump 3.
  • a certain flow form is impressed on the coarse material 11 and the cold gas by means of a tubular apron 26.
  • the apron 26 separates the grinding chamber into a central shaft 37, where the grinding process takes place, and into an annular shaft 38 for the coarse material flowing back.
  • the liquid nitrogen is supplied at two points, namely through line 12a directly into the sump 3 and through line 12b into a spray system 39 in the annular shaft 38.
  • the nitrogen introduced through line 12b therefore cools the coarse material flowing back from the classifier.
  • the invention is not limited to the embodiments described above, since there are numerous other possibilities for cooling the coarse material flowing back from the classifier by means of a refrigerant.
  • Several grinding zones with sump in the form of a cascade can also be connected in series. The mixture of fine and coarse material emerging from the grinding zone is separated from the exhaust gas in a filter and fed to the next grinding zone. The one under every meal zone swamp is cooled according to the invention. A sifter is only assigned to the last stage.
  • Hostalen (R) GUR 200 is a high-molecular polyethylene from Hoechst AG, Frankfurt. As the operating results show, the two investigated materials could not be ground to the finenesses that can be achieved with the method according to the invention under economic conditions.
  • the grain size analysis was determined using a commercially available laser granolaometer (Cilas). From the printed curve, the d10, d50 and d90 values were selected as representative values. For example, the d10 value of 10.2 ⁇ m in line 4 of the table means that 10% of the end product is grains with a size below 10.2 ⁇ m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
EP89115154A 1988-10-05 1989-08-17 Procédé et dispositif pour le brayage à froid Expired - Lifetime EP0362525B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89115154T ATE103208T1 (de) 1988-10-05 1989-08-17 Verfahren und vorrichtung zum kaltmahlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3833830A DE3833830A1 (de) 1988-10-05 1988-10-05 Verfahren und vorrichtung zum kaltmahlen
DE3833830 1988-10-05

Publications (3)

Publication Number Publication Date
EP0362525A2 true EP0362525A2 (fr) 1990-04-11
EP0362525A3 EP0362525A3 (fr) 1991-01-16
EP0362525B1 EP0362525B1 (fr) 1994-03-23

Family

ID=6364406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89115154A Expired - Lifetime EP0362525B1 (fr) 1988-10-05 1989-08-17 Procédé et dispositif pour le brayage à froid

Country Status (7)

Country Link
US (1) US4962893A (fr)
EP (1) EP0362525B1 (fr)
JP (1) JPH02227148A (fr)
AT (1) ATE103208T1 (fr)
DE (2) DE3833830A1 (fr)
ES (1) ES2052845T3 (fr)
ZA (1) ZA897535B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377170A3 (fr) * 1988-12-31 1991-05-02 Hoechst Aktiengesellschaft Procédé de fabrication de granules à grains fins de polyéthercétone et son utilisation
US5247052A (en) * 1988-12-31 1993-09-21 Hoechst Aktiengesellschaft Fine-grained polyether-ketone powder, process for the manufacture thereof, and the use thereof
US5887803A (en) * 1995-09-07 1999-03-30 Messer Griesheim Gmbh Process and apparatus for grinding and sifting a product
WO2007008480A1 (fr) * 2005-07-07 2007-01-18 Nanotherapeutics, Inc. Procédé servant à broyer et à préparer des poudres et compositions produites par celui-ci

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4220014A1 (de) * 1992-06-19 1993-12-23 Messer Griesheim Gmbh Verfahren zur Feinmahlung in Apparaten mit Mahlkörpern
DE10059442A1 (de) 2000-11-30 2002-06-13 Messer Griesheim Gmbh Vorrichtung und Verfahren zur Herstellung von Feingut aus chemisch aktivem Mahlgut
DE50208268D1 (de) 2001-07-05 2006-11-09 Kerr Mcgee Pigments Internat G Verfahren zur direkten kühlung von feinteiligen feststoffen
JP4287173B2 (ja) * 2003-03-18 2009-07-01 株式会社リコー カウンタージェットミル式粉砕分級機
DE10351174B4 (de) * 2003-05-05 2005-11-24 Zeiss, Karl Reinhard, Dipl.-Ing. Verfahren und Vorrichtung zum Trennen von Stoffgemischen
FI120625B (fi) * 2005-08-17 2009-12-31 Valtion Teknillinen Tärkkelyspohjainen kuituratojen täyteaine- ja päällystyspigmenttikoostumus ja menetelmä sen valmistamiseksi
US20110297586A1 (en) * 2010-04-28 2011-12-08 Jean-Francois Leon Process for Separating Bitumen from Other Constituents in Mined, Bitumen Rich, Ore
CA2703082A1 (fr) 2010-05-10 2011-11-10 Gary J. Bakken Methode pour lier des diamants polycristallins a des surfaces en carbure
DE102011014643A1 (de) * 2011-03-21 2012-09-27 Roland Nied Betriebsverfahren für eine Strahlmühlenanlage und Strahlmühlenanlage
WO2014127206A2 (fr) * 2013-02-15 2014-08-21 Ohio State Innovation Foundation Traitement de matières végétales récoltées, en vue de l'extraction de biopolymères ainsi que matières et procédés associés
JP6283204B2 (ja) * 2013-11-11 2018-02-21 大阪瓦斯株式会社 微粉化装置
CN105928756A (zh) * 2016-04-23 2016-09-07 陈传海 一种新型物料缩分二分器
FR3072307B1 (fr) * 2017-10-12 2019-11-15 Commissariat A L'energie Atomique Et Aux Energies Alternatives Dispositif et procede de broyage cryogenique a jets confluents
CN109806531B (zh) * 2019-01-30 2020-04-24 河南理工大学 一种低碳气体水合物粉碎抑爆装置
DE102020006008B3 (de) * 2020-10-01 2022-03-31 Hosokawa Alpine Aktiengesellschaft Fließbettgegenstrahlmühle zur Erzeugung feinster Partikel aus Aufgabegut geringer Schüttdichte und Verfahren dafür
CA3161043A1 (fr) 2022-02-18 2023-08-18 Gary J. Bakken Methode d'installation de couteaux sur un foret

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186648A (en) * 1963-05-27 1965-06-01 Grace W R & Co Fluid energy mill
US3897010A (en) * 1971-07-02 1975-07-29 Linde Ag Method of and apparatus for the milling of granular materials
DE2133019A1 (de) * 1971-07-02 1973-01-18 Linde Ag Verfahren und vorrichtung zum kaltstrahlmahlen
BR7302632D0 (pt) * 1972-04-13 1974-07-18 Union Carbide Corp Processo para pulverizar materias plasticas e elastomeras
DE2253516C2 (de) * 1972-10-28 1985-09-26 Fa. E. Kampffmeyer, 2000 Hamburg Verfahren zum Herstellung von Pulver aus Fett bzw. fettähnlichen Stoffen mit oder ohne Trägerstoffe
GB2044126B (en) * 1979-03-15 1983-04-20 Air Prod & Chem Method and apparatus for cryogenic grinding
GB2145351A (en) * 1983-08-24 1985-03-27 Howden James & Co Ltd Pulverizer
DE3338138C2 (de) * 1983-10-20 1986-01-16 Alpine Ag, 8900 Augsburg Fließbett-Gegenstrahlmühle
HU196323B (en) * 1985-04-03 1988-11-28 Magyar Aluminium Air-jet mill for fine and/or cryogenic grinding, surface treating advantageously hard, elastic and/or thermoplastic matters
JPS62273061A (ja) * 1986-05-20 1987-11-27 株式会社　栗本鉄工所 低温粉砕用気流式粉砕装置
JPS62273062A (ja) * 1986-05-20 1987-11-27 株式会社　栗本鉄工所 低温粉砕用気流式粉砕装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377170A3 (fr) * 1988-12-31 1991-05-02 Hoechst Aktiengesellschaft Procédé de fabrication de granules à grains fins de polyéthercétone et son utilisation
US5247052A (en) * 1988-12-31 1993-09-21 Hoechst Aktiengesellschaft Fine-grained polyether-ketone powder, process for the manufacture thereof, and the use thereof
US5887803A (en) * 1995-09-07 1999-03-30 Messer Griesheim Gmbh Process and apparatus for grinding and sifting a product
WO2007008480A1 (fr) * 2005-07-07 2007-01-18 Nanotherapeutics, Inc. Procédé servant à broyer et à préparer des poudres et compositions produites par celui-ci

Also Published As

Publication number Publication date
DE3833830C2 (fr) 1991-11-07
JPH02227148A (ja) 1990-09-10
ZA897535B (en) 1990-06-27
ATE103208T1 (de) 1994-04-15
DE58907281D1 (de) 1994-04-28
ES2052845T3 (es) 1994-07-16
EP0362525B1 (fr) 1994-03-23
DE3833830A1 (de) 1990-04-12
US4962893A (en) 1990-10-16
EP0362525A3 (fr) 1991-01-16

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