EP1339497B1 - Dispositif et procede pour fa onner des particules fines a partir de matiere moulue chimiquement active - Google Patents

Dispositif et procede pour fa onner des particules fines a partir de matiere moulue chimiquement active Download PDF

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Publication number
EP1339497B1
EP1339497B1 EP01995667A EP01995667A EP1339497B1 EP 1339497 B1 EP1339497 B1 EP 1339497B1 EP 01995667 A EP01995667 A EP 01995667A EP 01995667 A EP01995667 A EP 01995667A EP 1339497 B1 EP1339497 B1 EP 1339497B1
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EP
European Patent Office
Prior art keywords
mill
milled
coolant
stock
milled stock
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
EP01995667A
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German (de)
English (en)
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EP1339497A1 (fr
Inventor
Reinhard Krieg
Oliver Dietrich
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.)
KRIEG, REINHARD
Air Liquide Deutschland GmbH
Messer Group GmbH
Original Assignee
Air Liquide Deutschland GmbH
Messer Group GmbH
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Application filed by Air Liquide Deutschland GmbH, Messer Group GmbH filed Critical Air Liquide Deutschland GmbH
Publication of EP1339497A1 publication Critical patent/EP1339497A1/fr
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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
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
    • B02C19/186—Use of cold or heat for disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • the invention relates to a device and a method for producing fines from chemically active millbase.
  • grinding material to be comminuted in particular plastic
  • the comminuted material leaves the mill in a cold state, is collected and stored, with an adjustment of the temperature of the ground material to the ambient temperature.
  • electrostatics formed on the regrind may degrade.
  • a release agent is added in many cases. This is mixed in with the millbase. When sifting the oversize is separated from the fines and can be fed to the grinding process again. While the temperature of the ground material adapts to the ambient temperature during intermediate storage, water from the ambient air condenses on the particles of the ground material. As a result, the visibility and screening ability of the ground material is very limited. On interim drying and adding release agents can therefore not be waived for screening and screening in the previous cold milling. The associated work steps are time-consuming and costly.
  • the DE-PS 38 33 830 C2 describes a device for the production of extremely fine dusts with particle sizes up to less than 10 micrometers, in which a classifier is integrated.
  • the EP 0 044 507 A1 teaches a method in which labels of plastic parts are separated by sifting.
  • a device is shown in which the exiting a mill cold gas is released by a cyclone of particles.
  • the DE-OS 23 18 549 the comminuted by comminuted grinding material is classified by a sieve.
  • the object of the present invention is therefore to specify a device or a method which improves the production of fines in the case of chemically active starting materials, in particular in partially vulcanized elastomers.
  • the ground material to be ground is kept at a low temperature by means of the device for cooling, whereby the reactivity is reduced.
  • the flowability of the ground material thus remains at least substantially preserved until reaching the classification arrangement and classification is readily possible.
  • the classifying device comprises a sieve, which - in contrast to the classifiers often used for classifying - can also be used at low temperatures, and at the same time achieves a high selectivity.
  • a particularly reliable and convenient sieve is a tumble screen.
  • the ground product cooler includes a coolant supply line fluidly connected to a source of liquid or gaseous refrigerant.
  • a coolant such as liquefied petroleum gas
  • the source may be a tank, a compressed gas cylinder or a supply network.
  • the choice of a suitable coolant depends on the respective regrind.
  • the reactivity of partially vulcanized elastomers is reduced at temperatures below-100 ° C. to -120 ° C. in such a way that the flowability after grinding is substantially maintained.
  • liquid or cold gaseous nitrogen is suitable, which is fed to the material to be ground after passing through the mill.
  • care must also be taken to ensure that no chemical reaction between the millbase and the coolant is triggered unless it is intended.
  • the coolant supply line When using a sieve in the classification arrangement, it is advantageous to fluidly connect the coolant supply line to at least one spray nozzle, by means of which liquid or gaseous coolant can be dispensed onto a sieve surface intended to receive the ground millbase from the mill. As a result, the ground material is cooled immediately before or during the classification process.
  • the mill and the classification arrangement is integrated in a pressure-tight Zei-kleintationsaku.
  • the production of fines can thus take place in an inert atmosphere separated from the outside atmosphere and under overpressure, whereby the entry of outside air is reliably prevented.
  • the millbase is cooled after grinding and before classifying to reduce the chemical reactivity of the millbase and thus reliably prevent "clumping" of the millbase after the grinding process.
  • the cooling takes place before and after the comminution of the ground material in the mill by the addition of a liquid or gaseous coolant.
  • the coolant used can be used in an advantageous development of the method according to the invention to generate an inert atmosphere within the mill and / or within the classification arrangement.
  • Such a configuration which is also in the DE 196 35 778 A1 , which is incorporated herein by reference, serves, in particular, to inhibit the entry of moisture from the ambient air.
  • a coolant for example, liquid nitrogen is used, which evaporates during the cooling process and produces an inert atmosphere in this way.
  • the inert atmosphere in the mill and / or the classification arrangement is kept under a certain overpressure in order to reliably prevent the entry of ambient air even in the presence of any leaks.
  • the oversize removed during the classification becomes immediately after the classification fed again to the mill.
  • the usually still cold oversize contributes to the cooling of the grinding stock to be ground and thus reduces the consumption of refrigerant.
  • coolant is nitrogen, which is supplied to the millbase in liquid or cold gaseous state.
  • other refrigerants can be used with comparable properties.
  • the method according to the invention and the device according to the invention are suitable for the comminution of substances which have a temperature-dependent chemical reactivity or whose chemical or physical parameters which are decisive for a comminution process are temperature-dependent.
  • a preferred use of the device according to the invention or of the method according to the invention is the comminution of partially vulcanized elastomers.
  • the drawing shows a schematic view of an inventive device for producing fines.
  • the feed material is fed via a hopper on a screw conveyor 2, the output side of a metal separator 3, a rotary valve 4 and a cooling screw 5, which is charged by an injection 6 with liquid coolant, connects.
  • the outlet of the cooling screw 5 is fluidly connected to an impact mill 8, which in turn is fluidly connected to a hopper 10.
  • In the funnel 10 also opens a supply 7 for coolant.
  • the hopper 10 is followed by a rotary valve 11, from which a connection 12 leads to a tumbler 14.
  • the tumble screen 14 is located directly in front of the outlet opening of the rotary valve 11.
  • a supply line 13 for coolant In the tumble screen, a supply line 13 for coolant, with a plurality of spray nozzles, not shown here, opens on a serving for receiving the ground grinding material Sieve surface of the tumbler 14 are directed.
  • a line 15 From the tumble screen 14 branches off a line 15 with a rotary valve 16, which serves for the return of oversize.
  • Another line 17 serves to discharge the fine material and opens into a filter 18, which is equipped on the output side with a rotary valve 19.
  • a line 21 is connected to a filter 22.
  • the line 21 leads gaseous coolant to the input side 25 of the mill 8 back.
  • an exhaust pipe 23 From the line 21 branches off an exhaust pipe 23, which is equipped with a valve 24.
  • the feed material is fed via the hopper 1 to the screw conveyor 2, which introduces the feed material via the metal separator 3 in the rotary valve 4, which feeds the feed material of the cooling screw 5.
  • the liquid coolant in this case liquid nitrogen, is introduced into the cooling screw 5 via the injection 6.
  • the feed material pretreated in this way is fed to the mill 8, which comminutes the feed material.
  • the millbase comminuted in this way in the gas stream of the evaporated liquid nitrogen is fed to the hopper 10 and the rotary valve 11.
  • the feed 7 the comminuted material to be ground in the funnel 10 is subjected to a flow of cold liquid or gaseous coolant, for example nitrogen.
  • the cooled ground material is conveyed via the connection 12 to the tumble screen 14, where it is again acted upon by the flow from the supply line 13 with the spray nozzles with coolant.
  • the material to be ground is kept at a low temperature throughout the comminution process.
  • liquid nitrogen is used as the coolant, by means of which the temperature of the millbase in the mill 8 and in the tumble screen 14 is maintained at a value of minus 10 ° C to minus 80 ° C.
  • the device is pressure-sealed along the path from the mill 8, the funnel 10, the rotary valve 11 and the connection 12 with respect to the environment.
  • An overpressure which is produced either by adding an inert gas or - when using a liquefied gas, such as liquid nitrogen, as a coolant - by evaporation of the coolant, thereby preventing the entry of ambient air and the associated moisture in the mill 8 or the tumble screen 14th ,
  • the material to be ground falls out of the mill 8 via the hopper 10 and the rotary valve 11 in the tumble screen 14 when the sieve is structurally located below the mill.
  • a gas stream as a blowing agent for the promotion of the comminuted material to be ground and other device elements such as another screw conveyor.
  • the comminuted millbase gets in the cold gas stream of the coolant via the line 13 in the tumble screen 14, in which the oversize is separated from the fines.
  • the oversize passes back via the line 15 and the rotary valve 16 in the screw conveyor 2.
  • the fine material is conveyed via the line 17 into a filter 18, in which it is separated from the cold gas stream and discharged via the rotary valve 19.
  • the filter 22 in the line 21 accumulating particles are separated.
  • the gas stream exiting the filter which has a low temperature, can be recirculated via the continuation of the line 21 to the inlet side 25 of the mill 8 in order to reduce the total consumption of liquid nitrogen as a coolant.
  • excess cold gas can be discharged via the exhaust pipe 23 to the environment.
  • the exhaust pipe is provided with the valve 24, which may also be a pressure relief valve.
  • the process also takes place in a closed process, on-line, while keeping out ambient air and the associated humidity, without further intermediate steps such as tempering, drying and addition of release agents.
  • the process is operated with liquid nitrogen that evaporates in the process, however is also the use of other coolants with similar properties conceivable.
  • the inventive method is not limited to the application of impact mills, but other mills such.
  • B. granulators are used.
  • the feed can be comminuted with the method and apparatus substantially to less than 150 microns particle size in major proportions.
  • the chemical reactivity of the ground material is reduced during the entire process and, moreover, the ingress of atmospheric moisture is prevented.
  • a release agent is not required.
  • the grinding and classifying are carried out under inert gas simultaneously.
  • the risk of explosion is limited especially in oxygen-sensitive regrind.
  • the previously required steps mixing, release agent addition and intermediate storage can be omitted; this is associated with a significant reduction in personnel, operating and investment costs.
  • the oversize grain returned to the grinding plant has already cooled down during the process, which can reduce the consumption of coolant.
  • the method can be carried out with particular advantage in on-line operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Disintegrating Or Milling (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (12)

  1. Dispositif pour la fabrication de matière fine à base de matière broyée chimiquement active, en particulier pour la fabrication de matière fine à base d'élastomères partiellement vulcanisés, comprenant un broyeur (8) pour le broyage de la matière à broyer, un dispositif réfrigérant (5) pour la réfrigération de la matière à broyer à amener au broyeur (8) et un dispositif de triage (14) pour le triage de la matière à broyer broyée,
    un dispositif réfrigérant pour la matière à broyer broyée étant monté en aval du broyeur (8) et le dispositif de triage comprenant un crible, le dispositif réfrigérant pour la matière à broyer broyée comportant une arrivée de réfrigérant (7, 13), qui est reliée par écoulement à une source pour un réfrigérant liquide ou gazeux, et l'arrivée de réfrigérant (13) étant reliée par écoulement à une buse de pulvérisation, au moyen de laquelle du réfrigérant liquide ou gazeux peut être distribué sur une surface criblante, destinée à la réception de la matière à broyer broyée provenant du broyeur (8), du crible (14).
  2. Dispositif selon la revendication 1, sur lequel le crible est un crible oscillant (14).
  3. Dispositif selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que l'arrivée de réfrigérant (7) est reliée par écoulement à un crible de broyeur (10), recevant la matière broyée après l'opération de broyage, du broyeur (8).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le dispositif réfrigérant (5) pour le refroidissement de la matière à broyer à amener au broyeur (8) est relié par écoulement à la source pour un réfrigérant liquide ou gazeux.
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le broyeur (8) et le dispositif de triage (14) sont intégrés dans une unité de broyage fermée de façon étanche à la pression.
  6. Procédé pour la fabrication de matière fine à base de matière broyée chimiquement active, en particulier pour la fabrication de matière fine à base d'élastomères partiellement vulcanisés, avec lequel de la matière broyée est rendue fragile par un réfrigérant, est broyée dans un broyeur (8) et classée ensuite au moyen d'un crible oscillant (14),
    caractérisé en ce que
    la matière broyée est refroidie après le broyage dans le broyeur (8), mais avant le triage dans le crible oscillant (14), du fait que le crible oscillant (14) est alimenté en réfrigérant par des buses de pulvérisation.
  7. Procédé selon la revendication 6, caractérisé en ce que le refroidissement intervient avant et après le broyage de la matière à broyer dans le broyeur (8) par l'addition d'un réfrigérant liquide ou gazeux à la matière à broyer.
  8. Procédé selon la revendication 7, caractérisée en ce que le réfrigérant ajouté est utilisé pour générer une atmosphère inerte à l'intérieur du broyeur (8) et/ou à l'intérieur du crible oscillant (14).
  9. Procédé selon la revendication 8, caractérisé en ce que l'atmosphère inerte dans le broyeur (8) et/ou dans le crible oscillant (14) est maintenue pendant l'opération de broyage à une surpression par rapport à une atmosphère extérieure.
  10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que le surclassé, séparé dans le dispositif de triage (14) du broyeur, est amené à nouveau au broyeur (8), de préférence à l'état froid.
  11. Procédé selon l'une quelconque des revendications 6 à 10, caractérisé en ce que de l'azote gazeux liquide ou froid est utilisé comme réfrigérant.
  12. Utilisation d'un dispositif selon l'une quelconque des revendications 1 à 5 ou d'un procédé selon l'une quelconque des revendications 6 à 11 pour le broyage de matières avec réactivité dépendante de la température, par exemple des élastomères partiellement vulcanisés.
EP01995667A 2000-11-30 2001-11-27 Dispositif et procede pour fa onner des particules fines a partir de matiere moulue chimiquement active Expired - Lifetime EP1339497B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10059442 2000-11-30
DE10059442A DE10059442A1 (de) 2000-11-30 2000-11-30 Vorrichtung und Verfahren zur Herstellung von Feingut aus chemisch aktivem Mahlgut
PCT/EP2001/013799 WO2002043868A1 (fr) 2000-11-30 2001-11-27 Dispositif et procede pour façonner des particules fines a partir de matiere moulue chimiquement active

Publications (2)

Publication Number Publication Date
EP1339497A1 EP1339497A1 (fr) 2003-09-03
EP1339497B1 true EP1339497B1 (fr) 2009-04-15

Family

ID=7665234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01995667A Expired - Lifetime EP1339497B1 (fr) 2000-11-30 2001-11-27 Dispositif et procede pour fa onner des particules fines a partir de matiere moulue chimiquement active

Country Status (4)

Country Link
EP (1) EP1339497B1 (fr)
AT (1) ATE428503T1 (fr)
DE (2) DE10059442A1 (fr)
WO (1) WO2002043868A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005010700A1 (de) * 2005-03-09 2006-09-14 Studiengesellschaft Kohle Mbh Verfahren zur Synthese von Verbindungen
US9193106B2 (en) 2006-11-15 2015-11-24 Entex Rust & Mitschke Gmbh Blend of plastics with wood particles

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2180031A1 (en) 1972-04-13 1973-11-23 Union Carbide Corp Powdered plastic/elastomeric material prodn - by low temp grinding
US4222527A (en) * 1979-02-22 1980-09-16 Union Carbide Corporation Cryopulverizing packed bed control system
DE3027251C2 (de) 1980-07-18 1982-08-19 Tyczka GmbH & Co Gesellschaft für Gase, Wassertechnik, Engineering, 8192 Geretsried Verfahren zur Wiederverwertung von mit Etiketten beklebten Kunststoffteilen
DE3833830A1 (de) 1988-10-05 1990-04-12 Messer Griesheim Gmbh Verfahren und vorrichtung zum kaltmahlen
NL9301708A (nl) * 1993-10-05 1995-05-01 Marinus Tels Werkwijze en inrichting voor het verwijderen van verfresten van blik of kunststof en afscheiden daarvan.
DE19533078A1 (de) 1995-09-07 1997-03-13 Messer Griesheim Gmbh Verfahren und Vorrichtung zum Mahlen und Sichten von Mahlgut
DE19635778A1 (de) 1996-09-04 1998-03-05 Herbert Dressler Verfahren und Vorrichtung zum Herstellen von Pulvern und Pulverpartikeln durch Kaltmahlen

Also Published As

Publication number Publication date
DE10059442A1 (de) 2002-06-13
EP1339497A1 (fr) 2003-09-03
ATE428503T1 (de) 2009-05-15
WO2002043868A1 (fr) 2002-06-06
DE50114844D1 (de) 2009-05-28

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