EP0796660A1 - Method and device for fabricating ultrafine powders - Google Patents

Method and device for fabricating ultrafine powders Download PDF

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Publication number
EP0796660A1
EP0796660A1 EP97104100A EP97104100A EP0796660A1 EP 0796660 A1 EP0796660 A1 EP 0796660A1 EP 97104100 A EP97104100 A EP 97104100A EP 97104100 A EP97104100 A EP 97104100A EP 0796660 A1 EP0796660 A1 EP 0796660A1
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EP
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Prior art keywords
dryer
powder
drying chamber
surface treatment
mill
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EP97104100A
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German (de)
French (fr)
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EP0796660B1 (en
Inventor
Michael Andreae-Jäckering
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Altenburger Maschinen KG Jaeckering and Co
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Altenburger Maschinen KG Jaeckering and Co
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    • 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
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material

Definitions

  • the invention relates to a process for the production of extremely fine powders which are wet-ground in a mechanical mill and then dried.
  • the invention also relates to a plant for carrying out this method.
  • Powders of all kinds have to be finer and finer for technical reasons.
  • the finenesses achievable today are 1 ⁇ .
  • the powders affected here are wet-ground as components of a suspension in mechanical mills (ball mills, bead mills, annular gap mills, etc.). After grinding in the wet phase, the powders must be dried. For this purpose it is known to use spray dryers.
  • the present invention is based on the object of proposing a drying phase in a method of the type mentioned at the outset, which allows agglomerate-free drying of the allows extremely fine powder.
  • this object is achieved in that the drying of the ground powder, which is present in a suspension, is carried out in an air vortex mill.
  • the comminution principle is based on the fact that the regrind particles within a large number of air vortices, which are generated by rotating plates, are accelerated to a high speed and predominantly mutual impacts To run. Because the material is constantly in turbulent air currents, moisture adhering to the particles can be very quickly absorbed by the air and thus rapid and intensive drying can be achieved. In addition, the crushing effect is retained so that re-agglomerates do not arise.
  • agglomerate-free drying of the powders can be achieved in a single process step in the process according to the invention. It is expedient to supply hot air as carrier gas to the air vortex mill used as a dryer and / or to pump the suspension directly into the grinding chamber via a nozzle inlet. This accelerates drying.
  • Another advantage of the method according to the invention is that the agglomerate-free drying with a surface treatment the powder can be combined. This can be done, for example, by introducing the surface treatment agent together with the carrier air. Another possibility is that the treatment agent is sprayed into the grinding chamber of the mill through a nozzle.
  • Figures 1 and 2 show systems for performing the method according to the invention.
  • the schematically illustrated mechanical mill in which the powder is wet-ground is designated by 1.
  • the product is continuously conveyed through line 3 to the air vortex mill 4 serving as a dryer and injected into the grinding or drying chamber 5 via a nozzle, not shown in detail.
  • Air is supplied to the drying room 5 from below via the line 6.
  • the hot air generator arranged in line 6 is designated by 7.
  • the dried powder leaves the air vortex mill 4 used as a dryer through the upper product discharge 8 and reaches via line 9 into a commercially available filter cyclone 11, in which air and dried powder are separated.
  • the air leaves the cyclone 11 via the line 12 with the fan 13.
  • the powder exits through the product discharge 14.
  • the suspension leaving the mechanical mill 1 can be injected into the drying chamber 5 of the dryer 4 at various points.
  • the line 3 with the pump 2 can open into nozzles which are arranged at different heights.
  • a line 3 'leading to the upper region of the drying chamber and the pump 2' is shown in broken lines.
  • the choice of the location of the injection into the drying room 5 depends on the properties of the product and / or on the desired length of stay in the dryer 4.
  • the line 3 with the pump 2 opens into the lower region of the drying chamber 5 of the dryer 4.
  • a line 15 with the pump 16 opens into the upper region, preferably also via a nozzle, and connects to the container 18 in Connection is established.
  • the container 18 there is a surface treatment agent for the powder to be dried.
  • An alternative to this is shown in dashed lines, in which surface treatment agent, preferably in powder form, is introduced into the air intake of the dryer 4.
  • the line 19 opening into the air line 6 is provided with the blower 21, which is connected to the container 22 containing the agent.
  • the drying chamber 5 of the dryer 4 is supplied with hot air via line 6 and the suspension with the powder to be dried via line 3 (or 3 ′).
  • the powder is dried quickly, gently and without agglomerates within the large number of air vortices generated, e.g. to residual moisture of 0.5% and less.
  • the dried powder and the air leave the dryer 4 via the discharge 8 and are separated from one another in the cyclone 11.
  • a liquid treatment agent can be injected into the upper region of the drying chamber 5.
  • the product injected into the lower area is already dry, so that moisture adhering to the powder does not interfere with the desired coating.
  • the treatment agent can also be introduced into the hot air stream in line 6. This also applies to dry surface treatment agents that are in powder form e.g. be metered into the air intake of the dryer 4.
  • the water evaporates spontaneously without the products having a chance of re-agglomeration.
  • the typical inlet temperatures are between 200 ° and 400 ° C, in some special cases up to 500 ° C, the typical outlet temperatures of the mill are between 70 ° and 110 ° C. In a very short time, a temperature gradient of sometimes well over 300 ° C reached.
  • a coating of the product can e.g. be carried out with powdered stearate or with liquid stearic acid.
  • Stearate is preferably metered into the hot air intake, stearin into the drying room 5 (see FIG. 2).
  • Successful tests have been carried out with calcium carbonate and chalk (input TS each about 60%) as well as pigments and hydrated lime (input TS each about 30%).

Abstract

The system has an air-turbulence mill (4) which is used to dry the powder while in suspension. Hot air can be supplied to the drying mill as a carrier gas, the inlet and outlet temperatures being respectively 200 to 500 and 70 to 110 degrees celsius. The suspension containing the powder can be sprayed by nozzles into the mill drying chamber (5), and surface treatment of the powder can be carried out in the mill in addition to the drying operation, typically using a liquid sprayed by nozzles into the chamber.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von extrem feinen Pulvern, welche in einer mechanischen Mühle naß gemahlen und anschließend getrocknet werden. Außerdem bezieht sich die Erfindung auf eine Anlage zur Durchführung dieses Verfahrens.The invention relates to a process for the production of extremely fine powders which are wet-ground in a mechanical mill and then dried. The invention also relates to a plant for carrying out this method.

Pulver der verschiedensten Art (z.B. Kalzium-Carbonat, Titandioxid, Bentonit, Dolomit, Talkum, Pigmente usw.) müssen aus anwendungstechnischen Gründen immer feiner sein. Die heute erzielbaren Feinheiten liegen bei 1µ. Um diese Feinheiten zu erreichen, werden die hier betroffenen Pulver als Bestandteile einer Suspension in mechanischen Mühlen (Kugelmühlen, Perlmühlen, Ringspaltmühlen usw.) naß gemahlen. Nach dem Vermahlen in der nassen Phase müssen die Pulver getrocknet werden. Dazu ist es bekannt, Sprühtrockner einzusetzen.Powders of all kinds (e.g. calcium carbonate, titanium dioxide, bentonite, dolomite, talc, pigments, etc.) have to be finer and finer for technical reasons. The finenesses achievable today are 1µ. In order to achieve these subtleties, the powders affected here are wet-ground as components of a suspension in mechanical mills (ball mills, bead mills, annular gap mills, etc.). After grinding in the wet phase, the powders must be dried. For this purpose it is known to use spray dryers.

Während der Trocknungsphase entstehen im Sprühtrockner sehr häufig Re-Agglomerate. Diese müssen anschließend abgesichtet, erneut naß vermahlen, um die ursprüngliche Feinheit wiederherzustellen, sowie getrocknet und gesichtet werden.During the drying phase, re-agglomerates very often occur in the spray dryer. These must then be sifted, wet-ground again to restore the original fineness, and dried and sifted.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einem Verfahren der eingangs erwähnten Art eine Trocknungsphase vorzuschlagen, die eine agglomeratfreie Trocknung der extrem feinen Pulver ermöglicht.The present invention is based on the object of proposing a drying phase in a method of the type mentioned at the outset, which allows agglomerate-free drying of the allows extremely fine powder.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Trocknung der gemahlenen, in einer Suspension vorliegenden Pulver in einer Luftwirbelmühle erfolgt.According to the invention, this object is achieved in that the drying of the ground powder, which is present in a suspension, is carried out in an air vortex mill.

Bei Mühlen dieser Art, wie sie beispielsweise in der EP-B1-226 900 beschrieben werden, beruht das Zerkleinerungsprinzip darauf, daß die Mahlgutpartikel innerhalb einer Vielzahl von Luftwirbeln, die von rotierenden Platten erzeugt werden, auf eine hohe Geschwindigkeit beschleunigt werden und überwiegend gegenseitige Stöße ausführen. Dadurch, daß sich das Gut ständig innerhalb turbulenter Luftströme aufhält, kann den Partikeln anhaftende Feuchtigkeit sehr schnell von der Luft aufgenommen und damit eine schnelle und intensive Trocknung erreicht werden. Zusätzlich bleibt der Zerkleinerungseffekt erhalten, so daß Re-Agglomerate nicht entstehen. Im Vergleich zur herkömmlichen Trocknung von extrem feinen Pulvern in Sprühtrocknern, bei der mehrere nachfolgende Schritte - Sichtung, nasse Nachvermahlung sowie erneute Trocknung und Sichtung - erforderlich sind, kann beim erfindungsgemäßen Verfahren in einem einzigen Verfahrensschritt eine agglomeratfreie Trocknung der Pulver erreicht werden. Zweckmäßig ist es, der als Trockner eingesetzten Luftwirbelmühle heiße Luft als Trägergas zuzuführen und/oder die Suspension über einen Düseneintritt direkt in den Mahlraum zu pumpen. Eine Beschleunigung der Trocknung wird dadurch erreicht.In mills of this type, as described for example in EP-B1-226 900, the comminution principle is based on the fact that the regrind particles within a large number of air vortices, which are generated by rotating plates, are accelerated to a high speed and predominantly mutual impacts To run. Because the material is constantly in turbulent air currents, moisture adhering to the particles can be very quickly absorbed by the air and thus rapid and intensive drying can be achieved. In addition, the crushing effect is retained so that re-agglomerates do not arise. Compared to the conventional drying of extremely fine powders in spray dryers, in which several subsequent steps - sifting, wet regrinding and renewed drying and sifting - are required, agglomerate-free drying of the powders can be achieved in a single process step in the process according to the invention. It is expedient to supply hot air as carrier gas to the air vortex mill used as a dryer and / or to pump the suspension directly into the grinding chamber via a nozzle inlet. This accelerates drying.

Ein weiterer Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß die agglomeratfreie Trocknung mit einer Oberflächenbehandlung der Pulver kombiniert werden kann. Dieses kann z.B. in der Weise geschehen, daß das Oberflächenbehandlungsmittel zusammen mit der Trägerluft eingeführt wird. Eine andere Möglichkeit besteht darin, daß das Behandlungsmittel in den Mahlraum der Mühle über eine Düse eingesprüht wird.Another advantage of the method according to the invention is that the agglomerate-free drying with a surface treatment the powder can be combined. This can be done, for example, by introducing the surface treatment agent together with the carrier air. Another possibility is that the treatment agent is sprayed into the grinding chamber of the mill through a nozzle.

Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von in den Figuren 1 und 2 schematisch dargestellten Ausführungsbeispielen und anhand von Verfahrensbeispielen erläutert werden.Further advantages and details of the invention are to be explained on the basis of exemplary embodiments shown schematically in FIGS. 1 and 2 and on the basis of process examples.

Die Figuren 1 und 2 zeigen Anlagen zur Durchführung des erfindungsgemäßen Verfahrens. In beiden Figuren ist die schematisch dargestellte mechanische Mühle, in welcher die Naßvermahlung des Pulvers erfolgt, mit 1 bezeichnet. Mit Hilfe einer Schlauch- oder Monopumpe 2 wird das Produkt kontinuierlich durch die Leitung 3 zur als Trockner dienenden Luftwirbelmühle 4 gefördert und über eine im einzelnen nicht dargestellte Düse in den Mahl- bzw. Trockenraum 5 eingedüst. Von unten wird dem Trockenraum 5 über die Leitung 6 Luft zugeführt. Mit 7 ist der in der Leitung 6 angeordnete Heißlufterzeuger bezeichnet.Figures 1 and 2 show systems for performing the method according to the invention. In both figures, the schematically illustrated mechanical mill in which the powder is wet-ground is designated by 1. With the help of a hose or monopump 2, the product is continuously conveyed through line 3 to the air vortex mill 4 serving as a dryer and injected into the grinding or drying chamber 5 via a nozzle, not shown in detail. Air is supplied to the drying room 5 from below via the line 6. The hot air generator arranged in line 6 is designated by 7.

Das getrocknete Pulver verläßt die als Trockner eingesetzte Luftwirbelmühle 4 durch den oberen Produktaustrag 8 and gelangt über die Leitung 9 in einen handelsüblichen Filterzyklon 11, in dem die Trennung von Luft und getrocknetem Pulver erfolgt.The dried powder leaves the air vortex mill 4 used as a dryer through the upper product discharge 8 and reaches via line 9 into a commercially available filter cyclone 11, in which air and dried powder are separated.

Die Luft verläßt den Zyklon 11 über die Leitung 12 mit dem Ventilator 13. Das Pulver tritt durch den Produktaustrag 14 aus.The air leaves the cyclone 11 via the line 12 with the fan 13. The powder exits through the product discharge 14.

In Figur 1 ist angedeutet, daß die die mechanische Mühle 1 verlassende Suspension an verschiedenen Stellen in den Trockenraum 5 des Trockners 4 eingedüst werden kann. Die Leitung 3 mit der Pumpe 2 kann in Düsen münden, die auf unterschiedlichen Höhen angeordnet sind. Als Beispiel ist gestrichelt eine in Höhe des oberen Bereichs des Trockenraumes mündende Leitung 3' mit der Pumpe 2' dargestellt. Die Wahl des Ortes der Eindüsung in den Trockenraum 5 hängt von den Eigenschaften des Produktes und/oder von der gewünschten Aufenthaltsdauer im Trockner 4 ab.In Figure 1 it is indicated that the suspension leaving the mechanical mill 1 can be injected into the drying chamber 5 of the dryer 4 at various points. The line 3 with the pump 2 can open into nozzles which are arranged at different heights. As an example, a line 3 'leading to the upper region of the drying chamber and the pump 2' is shown in broken lines. The choice of the location of the injection into the drying room 5 depends on the properties of the product and / or on the desired length of stay in the dryer 4.

Beim Ausführungsbeispiel nach Figur 2 mündet die Leitung 3 mit der Pumpe 2 in den unteren Bereich des Trockenraumes 5 des Trockners 4. In den oberen Bereich mündet - vorzugsweise ebenfalls über eine Düse - eine Leitung 15 mit der Pumpe 16, welche mit dem Behälter 18 in Verbindung steht. Im Behälter 18 befindet sich ein Oberflächenbehandlungsmittel für das zu trocknende Pulver. Gestrichelt dargestellt ist eine Alternative dazu, bei der vorzugsweise in Pulverform vorliegendes Oberflächenbehandlungsmittel in die Luftansaugung des Trockners 4 eingeführt wird. Dazu ist die in die Luftleitung 6 mündende Leitung 19 mit dem Gebläse 21 vorgesehen, die mit dem das Mittel enthaltenden Behälter 22 in Verbindung steht.In the exemplary embodiment according to FIG. 2, the line 3 with the pump 2 opens into the lower region of the drying chamber 5 of the dryer 4. A line 15 with the pump 16 opens into the upper region, preferably also via a nozzle, and connects to the container 18 in Connection is established. In the container 18 there is a surface treatment agent for the powder to be dried. An alternative to this is shown in dashed lines, in which surface treatment agent, preferably in powder form, is introduced into the air intake of the dryer 4. For this purpose, the line 19 opening into the air line 6 is provided with the blower 21, which is connected to the container 22 containing the agent.

Während des Betriebs werden dem Trockenraum 5 des Trockners 4 über die Leitung 6 heiße Luft und über die Leitung 3 (bzw. 3') die Suspension mit dem zu trocknenden Pulver zugeführt. Die Trocknung der Pulver erfolgt schnell, schonend und agglomeratfrei innerhalb der Vielzahl der erzeugten Luftwirbel, z.B. auf Restfeuchten von 0,5 % und weniger. Das getrocknete Pulver und die Luft verlassen den Trockner 4 über den Austrag 8 und werden im Zyklon 11 voneinander getrennt.During operation, the drying chamber 5 of the dryer 4 is supplied with hot air via line 6 and the suspension with the powder to be dried via line 3 (or 3 ′). The powder is dried quickly, gently and without agglomerates within the large number of air vortices generated, e.g. to residual moisture of 0.5% and less. The dried powder and the air leave the dryer 4 via the discharge 8 and are separated from one another in the cyclone 11.

Ist gleichzeitig eine Oberflächenbehandlung (coating) gewünscht, kann - wie in Figur 2 gezeigt - ein flüssiges Behandlungsmittel in den oberen Bereich des Trockenraumes 5 eingedüst werden. In diesem Bereich ist in den unteren Bereich eingedüstes Produkt bereits trocken, so daß dem Pulver anhaftende Feuchtigkeit die gewünschte Beschichtung nicht stört. Für den Fall, daß dem Produkt anhaftende Feuchtigkeit den Beschichtungsprozeß nicht stört, kann das Behandlungsmittel auch in den Heißluftstrom in der Leitung 6 eingeführt werden. Dieses gilt auch für trockene Oberflächenbehandlungsmittel, die in Pulverform z.B. in den Luftansaugstutzen des Trockners 4 eindosiert werden.If a surface treatment (coating) is desired at the same time, as shown in FIG. 2, a liquid treatment agent can be injected into the upper region of the drying chamber 5. In this area, the product injected into the lower area is already dry, so that moisture adhering to the powder does not interfere with the desired coating. In the event that moisture adhering to the product does not interfere with the coating process, the treatment agent can also be introduced into the hot air stream in line 6. This also applies to dry surface treatment agents that are in powder form e.g. be metered into the air intake of the dryer 4.

Folgende mit Wasser vermahlene Pulver mit Korngrößen zwischen 1 und 50µ konnten in einer Versuchsanlage getrocknet werden: Produkt Trocken-Substanz Eingang Endprodukt Calcium-Carbonat 50 - 65 % 99,6 % Magnet-Schlamm 30 - 35 % 99,5 % Chromoxid 40 - 45 % 99,6 % Pigmente 25 - 30 % 99,5 % Eisenoxid 32 - 38 % 99,8 % Ceolit 60 % 95 % The following water-ground powders with grain sizes between 1 and 50µ could be dried in a test facility: product Dry substance entrance End product Calcium carbonate 50 - 65% 99.6% Magnet mud 30 - 35% 99.5% Chromium oxide 40 - 45% 99.6% Pigments 25-30% 99.5% Iron oxide 32 - 38% 99.8% Ceolit 60% 95%

Die Produkte durchströmen die Mühle innerhalb weniger Millisekunden und werden dem Heißgasstrom, welcher durch die Mühle in Wirbel versetzt wird, ausgesetzt. Hierbei verdampft spontan das Wasser, ohne daß die Produkte eine Chance zur Reagglomerierung haben. Die typischen Eingangstemperaturen liegen zwischen 200° und 400° C, in einigen Sonderfällen bis 500 ° C, die typischen Ausgangstemperaturen der Mühle liegen bei 70° bis 110° C. Es wird also in einer sehr kurzen Zeit ein Temperaturgefälle von zum Teil weit über 300° C erreicht.The products flow through the mill within a few milliseconds and are exposed to the hot gas flow which is swirled by the mill. The water evaporates spontaneously without the products having a chance of re-agglomeration. The typical inlet temperatures are between 200 ° and 400 ° C, in some special cases up to 500 ° C, the typical outlet temperatures of the mill are between 70 ° and 110 ° C. In a very short time, a temperature gradient of sometimes well over 300 ° C reached.

Eine Coatierung des Produktes kann z.B. mit in Pulverform vorliegendem Stearat oder mit flüssiger Stearinsäure durchgeführt werden. Stearat wird vorzugsweise in die Heißluftansaugung, Stearin in den Trockenraum 5 (vgl. Figur 2) zudosiert. Erfolgreiche Versuche sind mit Calcium-Carbonat und Kreide (Eingangs-TS jeweils etwa 60 %) sowie Pigmenten und Kalkhydrat (Eingangs-TS jeweils etwa 30 %) durchgeführt worden.A coating of the product can e.g. be carried out with powdered stearate or with liquid stearic acid. Stearate is preferably metered into the hot air intake, stearin into the drying room 5 (see FIG. 2). Successful tests have been carried out with calcium carbonate and chalk (input TS each about 60%) as well as pigments and hydrated lime (input TS each about 30%).

Claims (14)

Verfahren zur Herstellung von extrem feinen Pulvern, welche in einer mechanischen Mühle (1) naß gemahlen und anschließend getrocknet werden, dadurch gekennzeichnet, daß zur Trocknung der in einer Suspension vorliegenden Pulver eine Luftwirbelmühle als Trockner (4) verwendet wird.Process for the production of extremely fine powders, which are wet-ground in a mechanical mill (1) and then dried, characterized in that an air vortex mill is used as a dryer (4) to dry the powders present in a suspension. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß dem Trockner (4) heiße Luft als Trägergas zugeführt wird.A method according to claim 1, characterized in that hot air is supplied to the dryer (4) as a carrier gas. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Eingangstemperaturen zwischen 200° und 500° C, die Ausgangstemperaturen zwischen 70° und 110° C liegen.Process according to Claim 1 or 2, characterized in that the inlet temperatures are between 200 ° and 500 ° C, the outlet temperatures are between 70 ° and 110 ° C. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Suspension mit dem zu trocknenden Pulver in den Mahl- bzw. Trockenraum (5) des Trockners (4) eingedüst wird.Method according to claim 1, 2 or 3, characterized in that the suspension with the powder to be dried is injected into the grinding or drying chamber (5) of the dryer (4). Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß im Trockner (4) zusätzlich zur Trocknung eine Oberflächenbehandlung des Pulvers durchgeführt werden kann.Method according to one of the preceding claims, characterized in that, in addition to drying, a surface treatment of the powder can be carried out in the dryer (4). Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß flüssiges Oberflächenbehandlungsmittel in den Trockenraum (5) des Trockners (4) eingedüst wird.A method according to claim 5, characterized in that liquid surface treatment agent is injected into the drying chamber (5) of the dryer (4). Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Suspension mit dem zu trocknenden Pulver bei von unten nach oben durchströmtem Trockenraum in den unteren Bereich des Trockenraumes (5) und das Oberflächenbehandlungsmittel in den oberen Bereich des Trockenraumes (5) eingeführt wird.Method according to claim 6, characterized in that the suspension with the powder to be dried is introduced into the lower region of the drying chamber (5) with the drying chamber flowing through from bottom to top and the surface treatment agent is introduced into the upper region of the drying chamber (5). Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß in Pulverform vorliegendes Oberflächenbehandlungsmittel in die Luftansaugung des Trockners (4) eingeführt wird.A method according to claim 5, characterized in that the surface treatment agent in powder form is introduced into the air intake of the dryer (4). Anlage zur Durchführung eines Verfahrens zur Herstellung extrem feiner Pulver mit einer das Pulver naß vermahlenden mechanischen Mühle (1) und einem Trockner (4), dadurch gekennzeichnet, daß der Trockner (4) eine Luftwirbelmühle ist.Installation for carrying out a process for the production of extremely fine powders with a mechanical mill (1) wet grinding the powder and a dryer (4), characterized in that the dryer (4) is an air vortex mill. Anlage nach Anspruch 9, dadurch gekennzeichnet, daß der Austritt der mechanischen Mühle (1) über eine Leitung (3) mit einer Pumpe (2) mit dem Mahl- bzw. Trockenraum (5) des Trockners (4) in Verbindung steht.Plant according to claim 9, characterized in that the outlet of the mechanical mill (1) is connected via a line (3) with a pump (2) to the grinding or drying chamber (5) of the dryer (4). Anlage nach Anspruch 10, dadurch gekennzeichnet, daß die Mündung der Leitung (3) in den Trockenraum (5) als Düse ausgebildet ist.Installation according to claim 10, characterized in that the mouth of the line (3) into the drying room (5) is designed as a nozzle. Anlage nach Anspruch 9, 10 oder 11, dadurch gekennzeichnet, daß dem Produktaustrag (8) des Trockners (4) ein Filterzyklon (11) nachgeordnet ist.Plant according to claim 9, 10 or 11, characterized in that a filter cyclone (11) is arranged downstream of the product discharge (8) of the dryer (4). Anlage nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß in den Trockenraum (5) des Trockners (4) eine Leitung (15) mündet, die mit einem Behälter (18) für flüssiges Oberflächenbehandlungsmittel in Verbindung steht.Installation according to one of Claims 9 to 12, characterized in that a line (15) opens into the drying chamber (5) of the dryer (4) and is connected to a container (18) for liquid surface treatment agent. Anlage nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß in den Luftansaugbereich des Trockners (4) eine Leitung (19) mündet, die mit einem Behälter (22) für pulverförmiges Oberflächenbehandlungsmittel in Verbindung steht.Installation according to one of claims 9 to 13, characterized in that a line (19) opens into the air intake area of the dryer (4) and is connected to a container (22) for powdered surface treatment agent.
EP97104100A 1996-03-21 1997-03-12 Method and device for fabricating ultrafine powders Expired - Lifetime EP0796660B1 (en)

Applications Claiming Priority (3)

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DE19611112A DE19611112C2 (en) 1996-03-21 1996-03-21 Method and device for producing extremely fine powders
DE19611112 1996-03-21
US08/985,535 US5984212A (en) 1996-03-21 1997-12-05 Method and apparatus for production of extremely fine powder

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EP0796660A1 true EP0796660A1 (en) 1997-09-24
EP0796660B1 EP0796660B1 (en) 2000-06-14

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US (1) US5984212A (en)
EP (1) EP0796660B1 (en)
DE (1) DE19611112C2 (en)

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EP1555286A2 (en) * 2002-10-16 2005-07-20 Nabaltec GmbH Process for preparation of a flame retardant and process for preparation of a flame retardant polymer composition
EP1555286A3 (en) * 2002-10-16 2011-08-17 Nabaltec AG Process for preparation of a flame retardant and process for preparation of a flame retardant polymer composition
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WO2007006456A3 (en) * 2005-07-09 2007-05-24 Tronox Pigments Gmbh Production of titanium dioxide pigments using an air vortex mill
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WO2008146088A2 (en) * 2006-06-21 2008-12-04 Martinswerk Gmbh Process for producing magnesium hydroxide
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WO2008047237A3 (en) * 2006-06-21 2008-11-13 Martinswerk Gmbh A process for producing aluminum hydroxide particles
WO2008146089A2 (en) * 2006-06-21 2008-12-04 Martinswerk Gmbh Process for producing magnesium hydroxide
WO2008020324A2 (en) * 2006-06-21 2008-02-21 Martinswerk Gmbh A process for producing thermally stable aluminum trihydroxide particles through mill-drying a slurry
WO2008152451A2 (en) * 2006-06-21 2008-12-18 Martinswerk Gmbh A process for producing thermally stable aluminium trihydroxide particles through mill-drying a filter cake
WO2008152450A2 (en) * 2006-06-21 2008-12-18 Martinswerk Gmbh Coated aluminum hydroxide particles produced by mill drying
WO2008152451A3 (en) * 2006-06-21 2009-03-05 Martinswerk Gmbh A process for producing thermally stable aluminium trihydroxide particles through mill-drying a filter cake
WO2008152450A3 (en) * 2006-06-21 2009-07-02 Martinswerk Gmbh Coated aluminum hydroxide particles produced by mill drying
WO2008146089A3 (en) * 2006-06-21 2009-09-11 Martinswerk Gmbh Process for producing magnesium hydroxide
WO2008146088A3 (en) * 2006-06-21 2009-09-17 Martinswerk Gmbh Process for producing magnesium hydroxide
WO2008004131A2 (en) * 2006-06-21 2008-01-10 Martinswerk Gmbh A process for producing thermally stable aluminum trihydroxide particles through mill-drying a filter cake
WO2008001226A2 (en) * 2006-06-21 2008-01-03 Martinswerk, Gmbh A process for producing aluminum hydroxide particles
EP2724780A1 (en) * 2012-10-26 2014-04-30 Evonik Degussa GmbH Method for producing a thermal insulation mixture
WO2014063949A1 (en) * 2012-10-26 2014-05-01 Evonik Degussa Gmbh Method for producing a thermally insulating mixture
US9784402B2 (en) 2012-10-26 2017-10-10 Evonik Degussa Gmbh Method for producing a thermally insulating mixture

Also Published As

Publication number Publication date
EP0796660B1 (en) 2000-06-14
DE19611112A1 (en) 1997-09-25
US5984212A (en) 1999-11-16
DE19611112C2 (en) 2002-04-18

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