DE3529217C2 - - Google Patents
Info
- Publication number
- DE3529217C2 DE3529217C2 DE19853529217 DE3529217A DE3529217C2 DE 3529217 C2 DE3529217 C2 DE 3529217C2 DE 19853529217 DE19853529217 DE 19853529217 DE 3529217 A DE3529217 A DE 3529217A DE 3529217 C2 DE3529217 C2 DE 3529217C2
- Authority
- DE
- Germany
- Prior art keywords
- gas
- relaxing
- melt
- atomized
- powder
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines Pulvers, bei dem durch Entspannen eines Gases ein Gas strom hoher Strömungsgeschwindigkeit gebildet und eine Schmelze des zu pulverisierenden Materials durch den Gasstrom verdüst wird.The invention relates to a method for producing a Powder in which a gas is released by relaxing a gas stream high flow rate formed and a Melt the material to be pulverized through the Gas stream is atomized.
Bei einem derartigen Verfahren wird die Schmelze über eine Dosiereinrichtung einem geeigneten Verdüsungssystem zugeführt und bei Normaldruck unter Einwirkung eines energiereichen Fluidstromes verdüst. Als Fluid wird bei spielsweise Wasser oder Luft verwendet. Eine gegenüber diesen Fluiden bessere Pulverqualität läßt sich mit Hilfe eines inerten Gases erzielen. Das Inertgas wird üblicher weise verdichtet und in einer Verdüsungseinrichtung auf eine hohe Geschwin digkeit gebracht. Durch das Verdüsen der Schmelze werden Tropfen gebildet. Diese müssen ausreichend lang, d. h. bis zum Erreichen des erforderlichen Erstarrungsgrades abgekühlt werden.In such a process, the melt is over a dosing device a suitable atomization system fed and at normal pressure under the influence of a atomized energy-rich fluid flow. As a fluid at for example water or air. One opposite These fluids can be better powder quality with the help of an inert gas. The inert gas is becoming more common wisely condensed and in a spraying device to a high speed brought. By atomizing the melt Drop formed. These must be long enough. H. until the required degree of solidification is reached be cooled.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, mit dem ein sehr feinkörniges Pulver hergestellt werden kann.The invention has for its object a method of the type mentioned at the beginning, with which a very fine-grained powder can be produced.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das der Pulverisierung dienende Gas vor dem Entspannen erwärmt wird.This object is achieved in that the gas used for pulverization is heated before the expansion.
Durch das erfindungsgemäße Verfahren wird die Verdüsungs energie des Gases erhöht. Wurde eine Schmelze nach herkömmlichen Verfahren mit einem Gas verdüst, so besaß das Gas etwa Umgebungstemperatur. Im Vergleich zu diesem Verfahren sind die Geschwindigkeit und damit die Energie des Gasstromes beim erfindungsgemäßen Verfahren höher. Aufgrund der höheren Verdüsungsenergie wird beim erfindungs gemäßen Verfahren ein Pulver mit sehr feinem Korn gebildet. Von besonderem Vorteil ist dabei, daß das feinkörnige Pul ver aufgrund seiner größeren Oberfläche schneller abkühlt als ein weniger feinkörniges Pulver.Through the method according to the invention, the atomization energy of the gas increased. Was a melt after conventional method with a gas atomized the gas about ambient temperature. Compared to this Processes are speed and therefore energy of the gas flow in the process according to the invention is higher. Due to the higher atomization energy is the Invention According to the method, a powder with a very fine grain is formed. It is particularly advantageous that the fine-grained pulp cools faster due to its larger surface than a less fine-grained powder.
Die Schallgeschwindigkeit und somit die Strömungsgeschwindigkeit in bzw. von Gasen mit niedrigem Molekular gewicht ist besonders groß. Nach einer bevorzugten Aus gestaltung wird deshalb zum Verdüsen einer Schmelze ein Gas mit niedrigem Molekulargewicht verwendet. Die Strömungsgeschwindigkeit eines derartigen Gases ist nach dem Verlassen des Verdüsungssystems besonders hoch.The speed of sound and thus the flow speed in or of gases with low molecular weight weight is particularly large. After a preferred off design is therefore used to atomize a melt uses a low molecular weight gas. The Flow rate of such a gas is after leaving the atomization system particularly high.
Mit Vorteil wird daher gemäß einer bevorzugten Ausgestal tung der Erfindung Helium als Verdüsungsgas verwendet.It is therefore advantageous according to a preferred embodiment tion of the invention helium is used as the atomizing gas.
Eine besonders wirtschaftliche Verfahrensweise wird erzielt, wenn das Pulverisierungsgas vor dem Entspannen im Wärmetausch mit bereits entspanntem Gas erwärmt wird. In dieser Variante wird das Gas, das nach dem Verdüsen der Schmelze eine hohe Temperatur besitzt, in Wärmetausch mit dem Gas gebracht, das dem Verdüsungssystem zugeführt wird. Durch den Wärmetausch wird der Wärmeinhalt des Gases nach dem Verdüsen genutzt und das dem Verdüsungssystem zuzuführende Gas vorgewärmt.A particularly economical procedure is achieved when the pulverizing gas before relaxing in heat exchange with already relaxed Gas is heated. In this variant, the gas a high temperature after the melt is atomized owns, brought into heat exchange with the gas that the Atomization system is supplied. Through the heat exchange the heat content of the gas is used after atomization and preheated the gas to be supplied to the atomization system.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853529217 DE3529217A1 (en) | 1985-08-14 | 1985-08-14 | Process for preparing a powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853529217 DE3529217A1 (en) | 1985-08-14 | 1985-08-14 | Process for preparing a powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3529217A1 DE3529217A1 (en) | 1987-02-26 |
| DE3529217C2 true DE3529217C2 (en) | 1991-07-11 |
Family
ID=6278547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19853529217 Granted DE3529217A1 (en) | 1985-08-14 | 1985-08-14 | Process for preparing a powder |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3529217A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4414289A (en) * | 1988-09-30 | 1990-04-18 | Mallinckrodt, Inc. | A process for the production of granular metal soaps |
-
1985
- 1985-08-14 DE DE19853529217 patent/DE3529217A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE3529217A1 (en) | 1987-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: LINDE GAS AG, 82049 HOELLRIEGELSKREUTH, DE |