EP0638365B2 - Method and device for separating fine-grained solids into two grain size fractions - Google Patents
Method and device for separating fine-grained solids into two grain size fractions Download PDFInfo
- Publication number
- EP0638365B2 EP0638365B2 EP94112005A EP94112005A EP0638365B2 EP 0638365 B2 EP0638365 B2 EP 0638365B2 EP 94112005 A EP94112005 A EP 94112005A EP 94112005 A EP94112005 A EP 94112005A EP 0638365 B2 EP0638365 B2 EP 0638365B2
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- EP
- European Patent Office
- Prior art keywords
- flow
- dispersion
- wheel
- deflector wheel
- deflector
- 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
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- 239000007787 solid Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000006185 dispersion Substances 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000007599 discharging Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 20
- 239000007962 solid dispersion Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 230000001133 acceleration Effects 0.000 description 5
- 239000011362 coarse particle Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
- B04C5/18—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with auxiliary fluid assisting discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/60—Washing granular, powdered or lumpy materials; Wet separating by non-mechanical classifiers, e.g. slime tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
- B04B3/04—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
Definitions
- the invention relates to the separation a fine-grained solid dispersed in a liquid into a fine and a coarse. It concerns a procedure and an apparatus for performing this Separation in the grain size range below about 50 ⁇ m, preferably below about 10 ⁇ m.
- a fine-grained Solid with a grain size distribution from 0 to a maximum of 50 ⁇ m into a fine material and a coarse material at a separation limit to separate below about 10 microns preferably used hydrocyclones in which by the Influence of centrifugal force, wall friction and drag a liquid on the solid particles, this Separation is achieved.
- Flow conditions in a hydrocyclone is a sharp separation on a particular one Grain size not possible, so that the overlap area, i.e. the grain size range, both in Fines and coarse goods are usually undesirable is great.
- EP 0 355 285 A2 discloses a device in which a fine-grained solid in a drippable Liquid is dispersed and the dispersion in one Sink flow with superimposed rotation flow is forced.
- the one used to separate the fine material rotating working part consists of a stack of Cutting discs with those between the cutting discs free spaces.
- the rotating cutting disc stack is therefore loaded with coarse particle flows, which only a lower throughput of fine material flow through the cutting disc stack can be achieved.
- the invention is therefore the object based on a method and a device for separation a fine - grained solid into a fine material and to specify a coarse good that is economical a sharp separation, especially in the grain size range enable below about 10 microns.
- to Solving this problem is the fine-grained solid in a drippable liquid dispersed and the dispersion in a defined sink flow with superimposed, generated regardless of the sink flow Forced rotation flow.
- the ratio of thereby independently adjustable Velocity of sink and rotation flow determines the separation grain size or separation limit between fine and coarse goods, i.e. the particle size, for which the centrifugal force generated by the rotation and the generated by the sink current Liquid are in equilibrium, so with the same Probability in the fine or coarse arrives.
- the inventive method is particularly simple Realize processes in that sink and Rotational flow in a rotatingly driven, deflector wheel with flow from outside to inside parallel to its axis of rotation and flow channels forming blades are generated the solid dispersion on the deflector Outer circumference is abandoned.
- the to carry out the invention there is essentially an apparatus suitable for the method from a pressure-resistant housing with connections for the introduction of the feed dispersion and that Discharge of fine and coarse material dispersion, at least one rotatably mounted and driven in the housing Deflector wheel and a feed pump for that Introducing the feed dispersion.
- a pressure-resistant housing with connections for the introduction of the feed dispersion and that Discharge of fine and coarse material dispersion, at least one rotatably mounted and driven in the housing Deflector wheel and a feed pump for that Introducing the feed dispersion.
- the deflector wheel is arranged in a closed housing, into which the solid to be classified, dispersed in a liquid - the feed dispersion - is conveyed with a feed pump via an inlet connection.
- the dispersion flows through the rotating deflector wheel from the outside in, whereby the solid is separated into fine and coarse material. Particles, in which the stepping force exerted by the flowing liquid is smaller than the centrifugal force induced by the rotation of the deflector wheel, cannot get inside the wheel and are rejected. Particles where the drag force is greater than the centrifugal force enter the inside of the wheel with the liquid.
- This part of the dispersion thus contains the fine material fraction and leaves the housing of the separating device through a discharge connection which connects to the interior of the deflector wheel.
- the rejected particles leave the housing with the remaining part of the liquid as coarse material dispersion through a second discharge connection.
- the rotation of the deflector wheel means that Fine material dispersion when flowing through the wheel the centrifugal force overcome a relatively high pressure.
- This pressure depending on the operating state in the The order of magnitude of 3 to 20 bar is determined by the Feed pump applied.
- the housing of the separator and likewise the bearing of the drive shaft for the deflector wheel be pressure-resistant; for the latter is in in most cases the use of a mechanical seal required.
- Operating variables are the peripheral speed of the Deflector wheel and the radial flow velocity in the flow channels formed by blades.
- the peripheral speed can be given outer diameter of the deflector wheel can only be set via its speed; the radial flow velocity results from the free flow cross section of the deflector wheel and the volume flow of the fine material dispersion.
- This together with the volume flow of the coarse material dispersion are determined by the feed quantity of the feed dispersion determined, which on the conveying capacity of the Feed pump is set.
- the setting is made of their volume flow indirectly via the feed quantity and the division ratio of the volume flows of Fine and coarse material dispersion. The change of this Division ratio takes place in that the volume flow the coarse material dispersion is changed, e.g. by changing the discharge cross section or by dosed pumping of the coarse material dispersion.
- the axis of rotation of the deflector wheel is the simplest Case in the axis of a rotationally symmetrical, e.g. cylindrical housing in which the Liquid and the solid dispersed therein without special measures evenly with the deflector wheel co-rotates.
- a rotationally symmetrical housing in which the Liquid and the solid dispersed therein without special measures evenly with the deflector wheel co-rotates.
- the radial distance between the inner wall of the container and the size of the deflector wheel are small held, a uniform flow is achieved of the deflector wheel over its entire length. Short-circuit currents and backflow effects can can be effectively avoided.
- Optimal flow conditions are achieved when the radial distance less than 10% between inner wall and wheel circumference of the diameter of the deflector wheel.
- bumpers can be advantageous to be provided with special facilities, e.g. with rotating washers that are even Pre-acceleration of liquid and solid already in the outside area of the bumpers.
- the completion for the feed dispersion can be above, below or in the area of the deflector wheel be attached to the housing, a tangential Mouth with inflow in the direction of rotation of the deflector wheel the pre-acceleration of liquid and solid favors.
- An additional pre-classification effect can be achieved if the connection for the Feed dispersion with inflow in the axial direction at the bottom of the case and centrally to it is arranged. Coarse particles are thereby in the Worn near the housing wall, so that it No longer load the deflector wheel, but carry it out directly become.
- a longer flow path e.g. by one from the connection cross section to the housing cross section expanding, conical housing part, can improve the pre-grading effect.
- the deflector can be used in a known manner cylindrical paddle wheel with free interior his. The one developing in this interior However, potential vortex flow creates a high one Pressure loss, so the use of such a deflector only makes sense at low speeds, i.e. for relatively rough separations with small throughputs.
- the deflector wheel In addition to pre-acceleration, there is also one even flow through the deflector wheel for determining an optimal separation effect.
- a deflector wheel with solid-state vortex can Flow through a rotationally symmetrical design and shaped bodies arranged coaxially to the deflector wheel improve, with the radially aligned Scoop the deflector wheel from its circumference to extend to the shaped body.
- the molded body can e.g. designed as a cylinder, cone or truncated cone his.
- Fig. 1 shows a schematic representation Device designed according to the invention with a cylindrical Housing 1 to which the bearing 8 for receiving the deflector wheel 3 is flanged directly.
- the vertical-axis de-icing wheel 3 becomes the pulley 12 and hollow shaft 9 driven their bearings with a shaft seal 6 against the interior of the housing 1 are sealed.
- the one to be separated, in a liquid dispersed feed is through port 2 in the Pumped housing 1, from where it in the deflector 3 arrives. This is due to the separating effect of the deflector wheel 3 separated fine material is together with a part the liquid as a fine dispersion through the hollow shaft 9 discharged into the fixed fines collector 10 and flows through connection 4 to Further use.
- the one rejected by the deflector wheel 3 Coarse material flows with the remaining liquid by the centrally located in the bottom of the housing 1 Opening 11 in the coarse material collector 13 from there leaves through port 5 as coarse material dispersion.
- the amount of coarse material dispersion flowing through can Changing the cross section of the opening 11 can be controlled; the axially adjustable slide 7 is used for this purpose.
- Fig. 2 shows a variant with several, horizontal axes Bumpers 3 in a common Housing 1 are arranged. Every deflector wheel 3 is replaced by its own (not shown here) Motor driven by pulley 12. So that's it possible, the speed of each deflector 3 individually adjust so that from a feed dispersion several different at the same time composite fines dispersions subtracted can be.
- This variant is preferably used used high throughputs at low and at all To achieve deflector wheels with the same separation limit.
- Fig. 3 is instead of the straight bottom of Housing 1 (Fig. 1) a funnel-shaped, downward tapered component 14 attached to its deepest Place the connection 2 for the feed of the feed dispersion empties.
- Fig. 1 Compared to Fig. 1 are the Connections 2 and 5 interchanged in their position.
- This training serves to pre-classify the feed material to achieve such that the rotating deflector 3 causes the introduced dispersion to rotate, due to the coarse particles before entering the deflector wheel 3 to the walls delimiting the interior carried by component 14 and housing 1 and braked there so that they are no longer in the deflector wheel 3 can occur, but immediately through the Connection 5 are carried out.
- the quantity setting for the coarse material dispersion takes place here by the slide 7 inserted directly into connection 5.
- the deflector wheels 3 in FIGS. 1 to 3 consist essentially of two, with axial Distance between connected limit washers 15, 16, between which are parallel to the axis of rotation and blades 17 forming flow channels evenly distributed over the circumference of the discs are, being perpendicular or at an angle to Scope can be aligned.
- a central Bore in the one limiting disk 15 is the Fine material dispersion discharged into the hollow shaft 9.
- the peripheral surface is a cylindrical surface. But it can also as in Fig. 4 as a conical surface with the largest diameter on the limiting disc 15 with the central Bore designed to be more uniform Flow through the deflector wheel 3, especially outdoors Reach interior.
- the bumpers 3 of Figures 6 and 7 have again a cylindrical peripheral surface, whereby but the blades 17 radially aligned here extend to the axis of rotation of the deflector wheel 3. At this Execution does not form potential vortices, but a Solid-state vortex flow in deflector wheel 3.
- At the Deflector wheel 3 of FIG. 7 are also still flat Ring disks 19 with the same mutual distance attached, extending from the outer circumference of the deflector wheel 3 extend radially outwards and for pre-acceleration the outside of the deflector 3 serve incoming material dispersion.
- Figures 8 and 9 show in longitudinal and Ouerten a deflector 3 with coaxial molded body in the form of a cylinder, which is part of the hollow shaft 9 is trained.
- Blades 17 formed flow channel has Shaped body a gap opening 20 in the length of the axial Extension of the blades 17, through which the fine material dispersion can enter the hollow shaft 9 from where it via the fine material collector 10 and connection 4 (FIGS. 1 to 3) is removed from the separation device.
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- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Centrifugal Separators (AREA)
- Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
Description
Die Erfindung bezieht sich auf die Trennung eines feinkörnig in einer Flüssigkeit dispergierten Feststoffs in ein Feingut und ein Grobgut. Sie betrifft ein Verfahren und eine Vorrichtung zur Durchführung dieser Trennung im Korngrößenbereich unterhalb von etwa 50 µm, vorzugsweise unterhalb von etwa 10 µm.The invention relates to the separation a fine-grained solid dispersed in a liquid into a fine and a coarse. It concerns a procedure and an apparatus for performing this Separation in the grain size range below about 50 µm, preferably below about 10 µm.
Zur Lösung der Aufgabe, einen feinkörnigen Feststoff mit einer Kornverteilung von 0 bis maximal 50 µm in ein Feingut und ein Grobgut bei einer Trenngrenze unterhalb von etwa 10 µm zu trennen, werden bevorzugt Hydrozyklone eingesetzt, in denen durch die Einwirkung von Fliehkraft, Wandreibung und Schleppkraft einer Flüssigkeit auf die Feststoffpartikel, diese Trennung erzielt wird. Infolge der systembedingten verwickelten Strömungsverhältnisse in einem Hydrozyklon ist jedoch eine scharfe Trennung bei einer bestimmten Korngröße nicht möglich, so daß der Überschneidungsbereich, d.h. der Korngrößenbereich, der sowohl im Feingut als auch im Grobgut enthalten ist, meist unerwünscht groß ist.To solve the problem, a fine-grained Solid with a grain size distribution from 0 to a maximum of 50 µm into a fine material and a coarse material at a separation limit to separate below about 10 microns preferably used hydrocyclones in which by the Influence of centrifugal force, wall friction and drag a liquid on the solid particles, this Separation is achieved. As a result of the systemic involved Flow conditions in a hydrocyclone however, is a sharp separation on a particular one Grain size not possible, so that the overlap area, i.e. the grain size range, both in Fines and coarse goods are usually undesirable is great.
Die EP 0 355 285 A2 offenbart eine Vorrichtung, bei der ein feinkörniger Feststoff in einer tropfbaren Flüssigkeit dispergiert ist und die Dispersion in eine Senkenströmung mit überlagerter Rotationsströmung gezwungen ist.EP 0 355 285 A2 discloses a device in which a fine-grained solid in a drippable Liquid is dispersed and the dispersion in one Sink flow with superimposed rotation flow is forced.
Das zur Abtrennung des Feingutes dienende, rotierende Arbeitsteil besteht aus einem Stapel von Trennscheiben mit zwischen den Trennscheiben befindlichen freien Zwischenräumen.The one used to separate the fine material rotating working part consists of a stack of Cutting discs with those between the cutting discs free spaces.
Aufgrund der sich dort ausbildenden Potentialwirbelströmung führt eine Erhöhung der Senkenströmung zwangsläufig zu einer Vergrößerung der Rotationsgeschwindigkeit und damit zu einer Erhöhung der Rotationsströmung. Die Senkenströmung ist somit nicht unabhängig von der Rotationsströmung einstellbar. Eine exakte und vorhersehbare Einstellung und Variation der Trenngrenze ist hier aufgrund der Abhängigkeit der Verfahrensparameter nicht möglich.Because of the potential vortex flow that forms there leads to an increase in sink flow inevitably an increase in the Rotation speed and thus to an increase the rotational flow. The sink flow is thus cannot be set independently of the rotational flow. An exact and predictable attitude and Variation of the separation limit is due to the dependency the process parameters are not possible.
Außerdem ist es von Nachteil, daß grobe Teilchen zunächst in das Innere des rotierenden Trennscheibenstapels transportiert werden. Am Umfangsbereich des Trennscheibenstapels überwiegt nämlich zunächst die nach innen gerichtete Kraftkomponente aus der Senkenströmung auf die Teilchen und erst bei geringerem Radius innerhalb des Trennscheibenstapels erhöht sich die nach außen gerichtete Kraftkomponente aus der erhöhten Umfangsgeschwindigkeit auf die Teilchen, so daß die groben Partikel aus ihrer nach innen führenden Bewegungsrichtung umkehren und sich sodann nach außen bewegen.It is also disadvantageous that coarse particles first inside the rotating cutting disc stack be transported. At the The peripheral area of the cutting wheel stack predominates namely the inward force component from the sink flow onto the particles and only with a smaller radius within the cutting wheel stack the outward force component increases from the increased peripheral speed on the particles so that the coarse particles from their Reverse inward direction of movement and then move outwards.
Der rotierende Trennscheibenstapel wird daher mit groben Partikelströmungen belastet, wodurch nur ein geringerer Durchsatz an Feingutströmung durch den Trennscheibenstapel erzielt werden kann.The rotating cutting disc stack is therefore loaded with coarse particle flows, which only a lower throughput of fine material flow through the cutting disc stack can be achieved.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Trennung eines feinkörnigen Feststoffes in ein Feingut und ein Grobgut anzugeben, die in wirtschaftlicher Weise eine scharfe Trennung insbesondere im Korngrößenbereich unterhalb von etwa 10 µm ermöglichen. Zur Lösung dieser Aufgabe wird der feinkörnige Feststoff in einer tropfbaren Flüssigkeit dispergiert und die Dispersion in eine definierte Senkenströmung mit überlagerter, unabhängig von der Senkenströmung erzeugter Rotationsströmung gezwungen. Das Verhältnis der dabei unabhängig voneinander einstellbaren Geschwindigkeiten von Senken- und Rotationsströmung bestimmt die Trennkorngröße bzw. Trenngrenze zwischen Feingut und Grobgut, d.h. die Partikelgröße, für die die durch die Rotation erzeugte Fliehkraft und die durch die Senkenströmung erzeugte Schteppkraft der Flüssigkeit im Gleichgewicht sind, die also mit gleicher Wahrscheinlichkeit in das Feingut oder das Grobgut gelangt.The invention is therefore the object based on a method and a device for separation a fine - grained solid into a fine material and to specify a coarse good that is economical a sharp separation, especially in the grain size range enable below about 10 microns. to Solving this problem is the fine-grained solid in a drippable liquid dispersed and the dispersion in a defined sink flow with superimposed, generated regardless of the sink flow Forced rotation flow. The ratio of thereby independently adjustable Velocity of sink and rotation flow determines the separation grain size or separation limit between fine and coarse goods, i.e. the particle size, for which the centrifugal force generated by the rotation and the generated by the sink current Liquid are in equilibrium, so with the same Probability in the fine or coarse arrives.
Besonders einfach läßt sich das erfindungsgemäße Verfahren dadurch realisieren, daß Senken- und Rotationsströmung in einem rotierend angetriebenen, von außen nach innen durchströmten Abweiserad mit parallel zu seiner Drehachse verlaufenden und Strömungskanäle bildenden Schaufeln erzeugt werden, wobei die Feststoffdispersion dem Abweiserad am Außenumfang aufgegeben wird.The inventive method is particularly simple Realize processes in that sink and Rotational flow in a rotatingly driven, deflector wheel with flow from outside to inside parallel to its axis of rotation and flow channels forming blades are generated the solid dispersion on the deflector Outer circumference is abandoned.
Die zur Durchführung des erfindungsgemäßen
Verfahrens geeignete Vorrichtung besteht im wesentlichen
aus einem druckfesten Gehäuse mit Anschlüssen
für das Einbringen der Aufgabegutdispersion und das
Austragen von Feingut- und Grobgutdispersion, mindestens
einem im Gehäuse drehbar gelagerten und angetriebenen
Abweiserad und einer Speisepumpe für das
Einbringen der Aufgabegutdispersion. Vorteilhafte Ausgestaltungen
dieser Vorrichtung sind in den Ansprüchen
5 bis 12 dargestellt.The to carry out the invention
There is essentially an apparatus suitable for the method
from a pressure-resistant housing with connections
for the introduction of the feed dispersion and that
Discharge of fine and coarse material dispersion, at least
one rotatably mounted and driven in the housing
Deflector wheel and a feed pump for that
Introducing the feed dispersion. Advantageous configurations
this device are in the
Die folgenden Ausführungen beschreiben die
Erfindung im einzelnen:
Das Abweiserad ist in einem geschlossenen Gehäuse
angeordnet, in das der zu klassierende, in einer Flüssigkeit
dispergierte Feststoff - die Aufgabegutdispersion -
mit einer Speisepumpe über einen Zulaufanschluß
gefördert wird. Die Dispersion durchströmt das rotierende
Abweiserad von außen nach innen, wobei die
Trennung des Feststoffs in Feingut und Grobgut stattfindet.
Partikel, bei denen die durch die strömende Flüssigkeit
ausgeübte Schteppkraft kleiner ist als die durch
die Rotation des Abweiserades induzierte Fliehkraft,
können nicht in das Innere des Rades gelangen und
werden abgewiesen. Partikel, bei denen die Schleppkraft
größer ist als die Fliehkraft, gelangen mit der Flüssigkeit
in das Innere des Rades. Dieser Teil der
Dispersion enthält somit die Feingutfraktion und verläßt
das Gehäuse der Trennvorrichtung durch einen Austragsanschluß,
der sich an den innenraum des Abweiserades
anschließt. Durch einen zweiten
Austragsanschluß verlassen die abgewiesenen Partikel
mit dem restlichen Teil der Flüssigkeit als Grobgutdispersion
das Gehäuse.The following statements describe the invention in detail:
The deflector wheel is arranged in a closed housing, into which the solid to be classified, dispersed in a liquid - the feed dispersion - is conveyed with a feed pump via an inlet connection. The dispersion flows through the rotating deflector wheel from the outside in, whereby the solid is separated into fine and coarse material. Particles, in which the stepping force exerted by the flowing liquid is smaller than the centrifugal force induced by the rotation of the deflector wheel, cannot get inside the wheel and are rejected. Particles where the drag force is greater than the centrifugal force enter the inside of the wheel with the liquid. This part of the dispersion thus contains the fine material fraction and leaves the housing of the separating device through a discharge connection which connects to the interior of the deflector wheel. The rejected particles leave the housing with the remaining part of the liquid as coarse material dispersion through a second discharge connection.
Durch die Rotation des Abweiserades muß die Feingutdispersion beim Durchströmen des Rades entgegen der Fliehkraft einen relativ hohen Druck überwinden. Dieser Druck, der je nach Betriebszustand in der Größenordnung von 3 bis 20 bar liegt, wird durch die Speisepumpe aufgebracht. Dieser Belastung entsprechend muß das Gehäuse der Trennvorrichtung und ebenso die Lagerung der Antriebswelle für das Abweiserad druckfest ausgeführt sein; für letztere ist dabei in den meisten Fällen die Verwendung einer Gleitringdichtung erforderlich.The rotation of the deflector wheel means that Fine material dispersion when flowing through the wheel the centrifugal force overcome a relatively high pressure. This pressure, depending on the operating state in the The order of magnitude of 3 to 20 bar is determined by the Feed pump applied. Corresponding to this burden the housing of the separator and likewise the bearing of the drive shaft for the deflector wheel be pressure-resistant; for the latter is in in most cases the use of a mechanical seal required.
Die die Trennkorngröße bestimmenden Betriebsgrößen sind die Umfangsgeschwindigkeit des Abweiserades und die radiale Strömungsgeschwindigkeit in dessen durch Schaufeln gebildeten Strömungskanälen. Die Umfangsgeschwindigkeit kann bei gegebenem Außendurchmesser des Abweiserades allein über seine Drehzahl eingestellt werden; die radiale Strömungsgeschwindigkeit ergibt sich aus dem freien Strömungsquerschnitt des Abweiserades und dem Volumenstrom der Feingutdispersion. Dieser zusammen mit dem Volumenstrom der Grobgutdispersion werden durch die Zulaufmenge der Aufgabegutdispersion bestimmt, die über die Förderleistung der Speisepumpe eingestellt wird. Da die Feingutdispersion für gewöhnlich frei auslaufen soll, erfolgt die Einstellung ihres Volumenstroms indirekt über die Zulaufmenge und das Teilungsverhältnis der Volumenströme von Feingut- und Grobgutdispersion. Die Änderung dieses Teilungsverhältnisses erfolgt dadurch, daß der Volumenstrom der Grobgutdispersion verändert wird, z.B. durch Ändern des Austragsquerschnittes oder durch dosiertes Abpumpen der Grobgutdispersion.Which determine the size of the separation grain Operating variables are the peripheral speed of the Deflector wheel and the radial flow velocity in the flow channels formed by blades. The peripheral speed can be given outer diameter of the deflector wheel can only be set via its speed; the radial flow velocity results from the free flow cross section of the deflector wheel and the volume flow of the fine material dispersion. This together with the volume flow of the coarse material dispersion are determined by the feed quantity of the feed dispersion determined, which on the conveying capacity of the Feed pump is set. Because the fine dispersion usually should run free, the setting is made of their volume flow indirectly via the feed quantity and the division ratio of the volume flows of Fine and coarse material dispersion. The change of this Division ratio takes place in that the volume flow the coarse material dispersion is changed, e.g. by changing the discharge cross section or by dosed pumping of the coarse material dispersion.
Die Drehachse des Abweiserades liegt im einfachsten Fall in der Achse eines rotationssymmetrischen, z.B. zylindrischen Gehäuses, in dem die Flüssigkeit und der darin dispergierte Feststoff ohne besondere Maßnahmen gleichmäßig mit dem Abweiserad mitrotiert. Wird insbesondre bei einem zylindrischen Behälter der radiale Abstand zwischen der Innenwand des Behälters und dem Umfang des Abweiserades klein gehalten, erreicht man eine gleichmäßige Anströmung des Abweiserades über dessen gesamte Länge. Kurzschlußströmungen und Rückströmeffekte können so wirkungsvoll vermieden werden. Optimale Strömungsverhältnisse werden erreicht, wenn der radiale Abstand zwischen Innenwand und Radumfang weniger als 10 % des Durchmessers des Abweiserades beträgt.The axis of rotation of the deflector wheel is the simplest Case in the axis of a rotationally symmetrical, e.g. cylindrical housing in which the Liquid and the solid dispersed therein without special measures evenly with the deflector wheel co-rotates. Will be especially with a cylindrical Container the radial distance between the inner wall of the container and the size of the deflector wheel are small held, a uniform flow is achieved of the deflector wheel over its entire length. Short-circuit currents and backflow effects can can be effectively avoided. Optimal flow conditions are achieved when the radial distance less than 10% between inner wall and wheel circumference of the diameter of the deflector wheel.
In schwierigeren Fällen oder bei Einsatz mehrerer Abweiseräder im gemeinsamen Gehäuse, wenn sehr feine Trennungen und hohe Durchsatzleistungen gefordert werden, kann es von Vorteil sein, die Abweiseräder mit besonderen Einrichtungen zu versehen, z.B. mit rotierenden Ringscheiben, die eine gleichmäßige Vorbeschleunigung von Flüssigkeit und Feststoff bereits im Außenbereich der Abweiseräder bewirken.In more difficult cases or when using several Deflector wheels in the common housing, if very fine separations and high throughput rates bumpers can be advantageous to be provided with special facilities, e.g. with rotating washers that are even Pre-acceleration of liquid and solid already in the outside area of the bumpers.
Der Abschluß für die Aufgabegutdispersion kann oberhalb, unterhalb oder im Bereich des Abweiserades am Gehäuse angebracht sein, wobei eine tangentiale Einmündung mit Einströmung in Drehrichtung des Abweiserades die Vorbeschleunigung von Flüssigkeit und Feststoff begünstigt. Ein zusätzlicher Vorklassiereffekt läßt sich erreichen, wenn der Anschluß für die Aufgabegutdispersion mit Einströmung in axialer Richtung am unteren Ende des Gehäuses und zentral dazu angeordnet wird. Grobe Partikel werden dadurch in die Nähe der Gehäusewand getragen, so daß sie das Abweiserad nicht mehr belasten, sondern direkt ausgetragen werden. Ein längerer Strömungsweg, z.B. durch ein sich vom Anschlußquerschnitt auf den Gehäusequerschnitt erweiterndes, konisches Gehäuseteil, kann den Vorktassiereffekt noch verbessern.The completion for the feed dispersion can be above, below or in the area of the deflector wheel be attached to the housing, a tangential Mouth with inflow in the direction of rotation of the deflector wheel the pre-acceleration of liquid and solid favors. An additional pre-classification effect can be achieved if the connection for the Feed dispersion with inflow in the axial direction at the bottom of the case and centrally to it is arranged. Coarse particles are thereby in the Worn near the housing wall, so that it No longer load the deflector wheel, but carry it out directly become. A longer flow path, e.g. by one from the connection cross section to the housing cross section expanding, conical housing part, can improve the pre-grading effect.
Das Abweiserad kann in bekannter Weise als zylindrisches Schaufelrad mit freiem Innenraum ausgeführt sein. Die sich in diesem Innenraum ausbildende Potentialwirbelströmung erzeugt jedoch einen hohen Druckverlust, so daß der Einsatz eines solchen Abweiserades nur bei niedrigen Drehzahlen sinnvoll ist, d.h. für relativ grobe Trennungen bei kleinen Durchsätzen.The deflector can be used in a known manner cylindrical paddle wheel with free interior his. The one developing in this interior However, potential vortex flow creates a high one Pressure loss, so the use of such a deflector only makes sense at low speeds, i.e. for relatively rough separations with small throughputs.
Mit einem Abweiserad, bei dem sich radial ausgerichtete Schaufeln vom Umfang bis in den Bereich der Drehachse des Abweiserades erstrecken, kann die Ausbildung der Potentialwirbelströmung verhindert werden. Der Trennvorgang erfolgt nun in einem sogenannten Festkörperwirbel, dessen höchste Umfangsgeschwindigkeit im Gegensatz zur Potentialwirbelströmung an der Außenkante der Schaufeln liegt. Der Druckverlust ist erheblich geringer, dabei unabhängig vom Volumenstrom und ausschließlich von der Drehzahl des Abweiserades abhängig. In überraschender Weise wurde gefunden, daß mit einem Abweiserad mit Festkörperwirbel feinere Trennungen mit höherem Feingutauszug bei gleichzeitig größeren Durchsatzleistungen als bei einem Abweiserad mit Potentialwirbel erreicht werden können.With a deflector wheel that is radially aligned Buckets from the perimeter to the area extend the axis of rotation of the deflector, the Formation of the potential vortex flow can be prevented. The separation process now takes place in a so-called Solid vertebrae, the highest Circumferential speed in contrast to the potential vortex flow is on the outer edge of the blades. The pressure loss is considerably lower, but independent of the volume flow and exclusively of the Speed of the deflector wheel depends. In a surprising way Way was found that with a deflector with solid-state vortex finer separations with higher Fines extract with larger throughputs at the same time than with a deflector wheel with potential swirl can be achieved.
Für eine optimale Trennwirkung eines Abweiserades ist eine möglichst vollständige Vorbeschleunigung von Flüssigkeit und Feststoff vor dem Eintritt in die Schaufelkanäle des Abweiserades erforderlich; dies gilt insbesondere bei Anwendung eines Abweiserades mit Festkörperwirbel. In der Regel wird durch eine geeignete Anordnung des Anschlusses für die Aufgabegutdispersion eine meist ausreichende Vorbeschleunigung erreicht. Wo dies nicht der Fall ist, helfen z.B. fest mit dem Abweiserad verbundene, sich vom Umfangsbereich des Abweiserades radial nach außen erstrekkende Ringscheiben, die mit axialem Abstand zueinander und koaxial zur Drehachse des Abweiserades angeordnet sind. Diese Ringscheiben bewirken durch ihren Mitnahmeeffekt eine gleichmäßige und vollständige Vorbeschleunigung bis zum Eintritt in die Schaufelkanäle.For an optimal separation effect of a deflector wheel is the most complete possible pre-acceleration of liquid and solid before entering the Bucket channels of the deflector wheel required; this applies especially when using a deflector wheel Solid vertebrae. As a rule, by an appropriate Arrangement of the feed dispersion connector usually sufficient pre-acceleration reached. Where this is not the case, e.g. firmly with connected to the deflector wheel, away from the peripheral area of the deflector wheel extending radially outwards Washers with axial spacing to each other and coaxial to the axis of rotation of the deflector wheel are arranged. These washers cause due to their take-away effect, an even and complete Pre-acceleration until entry into the Vane channels.
Neben der Vorbeschleunigung ist auch eine gleichmäßige Durchströmung des Abweiserades für eine optimale Trennwirkung bestimmend. Vor allem bei einem Abweiserad mit Festkörperwirbel läßt sich die Durchströmung durch rotationssymmetrisch ausgebildete und koaxial zum Abweiserad angeordnete Formkörper verbessern, wobei sich die radial ausgerichteten Schaufeln des Abweiserades von dessen Umfang bis zu dem Formkörper erstrecken. Der Formkörper kann z.B. als Zylinder, Kegel oder Kegelstumpf ausgebildet sein.In addition to pre-acceleration, there is also one even flow through the deflector wheel for determining an optimal separation effect. Especially with a deflector wheel with solid-state vortex can Flow through a rotationally symmetrical design and shaped bodies arranged coaxially to the deflector wheel improve, with the radially aligned Scoop the deflector wheel from its circumference to extend to the shaped body. The molded body can e.g. designed as a cylinder, cone or truncated cone his.
Bei der Klassierung eines in einer Flüssigkeit dispergierten Feststoffes besteht in den meisten Fällen keine Gefahr, daß sich der Feststoff an den von der Dispersion berührten Flächen ansetzt. Daher ist es möglich, bei fliegender Lagerung des Abweiserades die Antriebswelle, bei zweiseitiger Lagerung eine Achse für den Feingutaustrag rohrförmig auszubilden. Eine aufwendige Abdichtung des Feingutaustrittes gegen den Innenraum des Gehäuses kann dann entfallen. Die ausgetragene Feingutdispersion wird in einem Sammler aufgefangen und kann dann frei abfließen. Eine vorteilhafte Ausbildung ergibt sich dabei, wenn der oben erwähnte Formkörper als Teil der hohlen Antriebswelle oder Achse ausgebildet ist und für jeden von den Schaufeln des Abweiserades gebildeten Strömungskanal zumindest eine Öffnung aufweist, durch die Flüssigkeit und Feingut in die hohle Welle oder Achse eintreten kann.When classifying one in a liquid dispersed solid exists in most cases no danger that the solid will adhere to the Dispersion touches surfaces. Therefore, it is possible if the deflector wheel is stored on the fly Drive shaft, one axle for two-sided bearings to design the fine material discharge in the form of a tube. An elaborate one Sealing the fine material outlet against the The interior of the housing can then be omitted. The carried out Fine material dispersion is in a collector caught and can then drain freely. An advantageous one Training arises when the above mentioned moldings as part of the hollow drive shaft or axis is formed and for each of the Blades of the deflection wheel formed flow channel has at least one opening through the liquid and fine material enter the hollow shaft or axis can.
Ausführungsbeispiele sind in den Zeichnungen dargestellt. Funktionell gleiche Bauelemente haben in allen Zeichnungen die gleiche Positionsnummer.Exemplary embodiments are in the drawings shown. Functionally identical components have in all drawings have the same position number.
Fig. 1 zeigt in schematischer Darstellung eine
erfindungsgemäß ausgebildete Vorrichtung mit zylindrischem
Gehäuse 1, an das die Lagerung 8 zur Aufnahme
des Abweiserades 3 direkt angeflanscht ist. Das
vertikalachsige Abeiserad 3 wird der Riemenscheibe 12
und Hohlwelle 9 angetrieben deren Lager mit einer Wellendichtung
6 gegen den Innenraum des Gehäuses 1
abgedichtet sind. Das zu trennende, in einer Flüssigkeit
dispergierte Aufgabegut wird durch Anschluß 2 in das
Gehäuse 1 gepumpt, von wo es in das Abweiserad 3
gelangt. Das durch die Trennwirkung des Abweiserades
3 abgetrennte Feingut wird zusammen mit einem Teil
der Flüssigkeit als Feingutdispersion durch die Hohlwelle
9 in den feststehenden Feingutsammler 10 ausgetragen
und fließt durch Anschluß 4 zur
Weiterverwendung ab. Das vom Abweiserad 3 abgewiesene
Grobgut strömt mit der restlichen Flüssigkeit
durch die im Boden des Gehäuses 1 zentral angeordnete
Öffnung 11 in den Grobgutsammler 13 ab, den es
durch Anschluß 5 als Grobgutdispersion verläßt. Die
Menge der abfließenden Grobgutdispersion kann durch
Ändern des Querschnitts der Öffnung 11 gesteuert werden;
dazu dient hier der axial verstellbare Schieber 7.Fig. 1 shows a schematic representation
Device designed according to the invention with a
Fig. 2 zeigt eine Variante mit mehreren, horizontalachsigen
Abweiserädern 3, die in einem gemeinsamen
Gehäuse 1 angeordnet sind. Jedes Abweiserad
3 wird durch einen eigenen (hier nicht dargestellten)
Motor über Riemenscheibe 12 angetrieben. Damit ist es
möglich, die Drehzahl eines jeden Abweiserades 3 individuell
einzustellen, so daß aus einer Aufgabegutdispersion
gleichzeitig auch mehrere unterschiedlich
zusammengesetzte Feingutdispersionen abgezogen
werden können. Vorzugsweise wird diese Variante dazu
verwendet, hohe Durchsätze bei niedriger und bei allen
Abweiserädern gleicher Trenngrenze zu erreichen.Fig. 2 shows a variant with several,
In Fig. 3 ist anstelle des geraden Bodens von
Gehäuse 1 (Fig. 1) ein trichterförmiges, sich nach unten
verjüngendes Bauteil 14 befestigt, an dessen tiefster
Stelle der Anschluß 2 für den Zulauf der Aufgabegutdispersion
mündet. Gegenüber Fig. 1 sind die
Anschlüsse 2 und 5 in ihrer Lage vertauscht. Diese Ausbildung
dient dazu, eine Vorklassierung des Aufgabegutes
zu erreichen, derart, daß das drehende Abweiserad
3 eine Rotation der eingebrachten Dispersion bewirkt,
durch die grobe Partikel noch vor Eintritt in das Abweiserad
3 an die den Innenraum begrenzenden Wände
von Bauteil 14 und Gehäuse 1 getragen und dort abgebremst
werden, so daß sie nicht mehr in das Abweiserad
3 eintreten können, sondern gleich durch den
Anschluß 5 ausgetragen werden. Die Mengeneinstellung
für die Grobgutdispersion erfolgt hier durch den
direkt in den Anschluß 5 eingesetzten Schieber 7.In Fig. 3 is instead of the straight bottom of
Housing 1 (Fig. 1) a funnel-shaped, downward
tapered
Die Abweiseräder 3 in den Figuren 1 bis 3
bestehen im wesentlichen aus zwei, mit axialem
Abstand miteinander verbundenen Begrenzungsscheiben
15, 16, zwischen denen parallel zur Drehachse verlaufende
und Strömungskanäle bildende Schaufeln 17
über den Umfang der Scheiben gleichmäßig verteilt
sind, wobei sie senkrecht oder unter einem Winkel zum
Umfang ausgerichtet sein können. Durch eine zentrale
Bohrung in der einen Begrenzungsscheibe 15 wird die
Feingutdispersion in die Hohlwelle 9 ausgetragen. Die
durch die Außenkanten der Schaufeln 17 bestimmte
Umfangsfläche ist eine Zylinderfläche. Sie kann aber
auch wie in Fig. 4 als Kegelfläche mit größtem Durchmesser
an der Begrenzungsscheibe 15 mit der zentralen
Bohrung ausgebildet sein, um eine gleichmäßigere
Durchströmung des Abweiserades 3 vor allem im freien
Innenraum zu erreichen.The
Die gleiche Aufgabe erfüllt in Fig. 5 der konzentrisch
in das Abweiserad 3 eingesetzte und an der
Begrenzungsscheibe 16 befestigte kegelförmige Formkörper
18.The same task is performed concentrically in FIG. 5
inserted in the
Die Abweiseräder 3 der Figuren 6 und 7 haben
wiederum eine zylindrische Umfangsfläche, wobei sich
die hier radial ausgerichteten Schaufeln 17 jedoch bis
zur Drehachse des Abweiserades 3 erstrecken. Bei dieser
Ausführung bildet sich keine Potentialwirbel-, sondern
eine
Festkörperwirbelströmung im Abweiserad 3 aus. Am
Abweiserad 3 der Fig. 7 sind außerdem noch ebene
Ringscheiben 19 mit gleichem gegenseitigen Abstand
befestigt, die sich vom Außenumfang des Abweiserades
3 radial nach außen erstrecken und zur Vorbeschleunigung
der von außen dem Abweiserad 3
zuströmenden Aufgabegutdispersion dienen.The
Die Figuren 8 und 9 zeigen in Längs- und
Ouerschnitt ein Abweiserad 3 mit koaxialem Formkörper
in Form eines Zylinders, der als Teil der Hohlwelle 9
ausgebildet ist. Für jeden von zwei benachbarten
Schaufeln 17 gebildeten Strömungskanal weist der
Formkörper eine Spaltöffnung 20 in Länge der axialen
Erstreckung der Schaufeln 17, durch die die Feingutdispersion
in die Hohlwelle 9 eintreten kann, von wo sie
über den Feingutsammler 10 und Anschluß 4 (Figuren 1
bis 3) aus der Trennvorrichtung abgeführt wird.Figures 8 and 9 show in longitudinal and
Ouerschnitt a
Claims (12)
- Process to separate a fine-grained solid dispersed in a liquid with the capacity of forming drops into a fine fraction and a coarse fraction whereby the coarse material is conveyed to the periphery in a rotating flow field and the fine fraction is conveyed to the centre in a sink flow, characterised in that the dispersion is forced into a defined sink flow with superimposed rotational flow generated independent of the sink flow, and the cut point between the fines and the coarse is set by selecting the relationship between the speed of the sink flow and that of the rotational flow, namely by altering the supply rate of the feed dispersion on the one hand and by altering the rotational speed of the rotational flow on the other hand.
- Process according to Claim 1, characterised in that to generate the sink flow, the dispersion is pumped to flow from the outside periphery to the centre of a deflector wheel equipped with flow-channel-forming vanes which run parallel to the wheel's rotational axis and that to generate the rotational flow, the deflector wheel is driven to rotate.
- Device to carry out the process according to Claim 1 or 2, comprising a pressure-proof housing (1) with sockets for introducing the feed dispersion (2) and for discharging both the fine dispersion (4) and coarse dispersion (5), with at least one defector wheel (3) arranged to rotate within the housing (1) equipped with radially oriented vanes as well as a feed pump for introducing the feed dispersion (2).
- Device according to Claim 3, characterised in that the housing (1) is designed as a rotationally symmetrical vessel.
- Device according to Claim 3 with a cylindrical vessel, characterised in that the radial distance between the inside wall of the vessel and the periphery of the deflector wheel is less than 10% of the diameter of the deflector wheel.
- Device according to Claim 4 or 5, characterised in that the socket for the coarse dispersion (5) is located at the centre of the bottom end of the housing (1).
- Device according to Claim 4 or 5, characterised in that the socket for the feed dispersion (2) is located at the centre of the bottom end of the housing (1).
- Device according to one of the Claims 3 - 7, characterised in that the discharge socket for the coarse dispersion (5) is adjustable in diameter.
- Device according to one of the Claims 3 - 7, characterised in that a suction pump with adjustable flow rate is located at the socket for the coarse dispersion (5).
- Device according to one of the Claims 3 - 7, characterised in that the vanes (17) of the deflector wheel (3) are radially oriented and extend from the periphery into the area of the rotational axis of the deflector wheel (3).
- Device according to one of the Claims 3 - 7, characterised in that the vanes (17) of the deflector wheel (3) are radially oriented and extend from the wheel's periphery to a shaped insert (18) which is designed to be rotationally symmetrical and which is arranged coaxially to the defector wheel (3).
- Device according to Claim 11, characterised in that the shaped insert (18) is an integral part of the hollow drive shaft (9) of the deflector wheel (3) and, for each of the flow channels formed by the vanes of the deflector wheel, has at least one aperture (20) to permit the fines to discharge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4326605A DE4326605A1 (en) | 1993-08-07 | 1993-08-07 | Method and device for separating a fine-grained solid into two grain fractions |
| DE4326605 | 1993-08-07 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| EP0638365A2 EP0638365A2 (en) | 1995-02-15 |
| EP0638365A3 EP0638365A3 (en) | 1995-09-13 |
| EP0638365B1 EP0638365B1 (en) | 1999-05-26 |
| EP0638365B2 true EP0638365B2 (en) | 2003-11-26 |
Family
ID=6494711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94112005A Expired - Lifetime EP0638365B2 (en) | 1993-08-07 | 1994-08-01 | Method and device for separating fine-grained solids into two grain size fractions |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5894935A (en) |
| EP (1) | EP0638365B2 (en) |
| JP (1) | JP2752585B2 (en) |
| KR (1) | KR0148400B1 (en) |
| CN (1) | CN1056787C (en) |
| AT (1) | ATE180420T1 (en) |
| DE (2) | DE4326605A1 (en) |
| ES (1) | ES2134296T3 (en) |
| TW (1) | TW259722B (en) |
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| DE3721401A1 (en) * | 1987-06-29 | 1989-01-12 | Voith Gmbh J M | HYDROCYCLONE |
| DE3827558C2 (en) * | 1988-08-13 | 1995-12-14 | Fryma Masch Ag | Method and device for grinding ground material conveyed as a suspension |
| DE3905123A1 (en) * | 1989-02-20 | 1990-08-23 | Kloeckner Humboldt Deutz Ag | Sifter for sifting granular material and milling system with the activation of such a sifter |
| SU1646610A1 (en) * | 1989-03-09 | 1991-05-07 | Petrov Aleksandr T | Centrifugal filter thickener |
| JPH03151067A (en) * | 1989-11-06 | 1991-06-27 | Machiko Nonaka | Method for classifying slurry or the like |
| JPH0462785A (en) * | 1990-06-29 | 1992-02-27 | Toshiba Corp | Electric power supply for magnetron drive |
| DE4040890C2 (en) * | 1990-12-20 | 1995-03-23 | Krupp Foerdertechnik Gmbh | Air classifier |
| US5284250A (en) * | 1991-09-13 | 1994-02-08 | Stepenhoff Gary F | Particle separation apparatus |
| DE4214771C2 (en) * | 1992-05-04 | 1998-05-14 | Netzsch Erich Holding | Wet grading method and apparatus |
-
1993
- 1993-08-07 DE DE4326605A patent/DE4326605A1/en not_active Withdrawn
-
1994
- 1994-07-30 TW TW083106983A patent/TW259722B/zh active
- 1994-08-01 AT AT94112005T patent/ATE180420T1/en not_active IP Right Cessation
- 1994-08-01 EP EP94112005A patent/EP0638365B2/en not_active Expired - Lifetime
- 1994-08-01 DE DE59408302T patent/DE59408302D1/en not_active Expired - Lifetime
- 1994-08-01 ES ES94112005T patent/ES2134296T3/en not_active Expired - Lifetime
- 1994-08-04 US US08/286,037 patent/US5894935A/en not_active Expired - Fee Related
- 1994-08-05 KR KR1019940019375A patent/KR0148400B1/en not_active IP Right Cessation
- 1994-08-05 CN CN94116159A patent/CN1056787C/en not_active Expired - Fee Related
- 1994-08-05 JP JP6184674A patent/JP2752585B2/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1664769A (en) † | 1925-07-29 | 1928-04-03 | Henry M Chance | Method and apparatus for centrifugal thickening of mixtures and clarifying of liquids |
| DE3390449C2 (en) † | 1983-01-28 | 1987-06-11 | Bruss Vni Skogo I Pi Galurgii | Turbo cyclone to separate trays |
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| Title |
|---|
| "Aufbereitungs-Technik", Nr. 4, 1965, Seiten 213,214 † |
| "IFPRI-Report" on Classification of particles in gases, Prof. Dr. Ing. K. Leschonski, Clausthal, Mai 1981, Seiten 1.1, 1.2. 4.63 bis 4.66 † |
| Kellerwessel, Hans, Lehrbuch "Aufbereitung disperser Feststoffe: mineralische Rohstoffe, Sekundärrohstoffe, Abfälle", VDI-Verlag Düsseldorf, 1991, Seiten 78-79 † |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59408302D1 (en) | 1999-07-01 |
| EP0638365A2 (en) | 1995-02-15 |
| ES2134296T3 (en) | 1999-10-01 |
| KR950005382A (en) | 1995-03-20 |
| EP0638365B1 (en) | 1999-05-26 |
| ATE180420T1 (en) | 1999-06-15 |
| EP0638365A3 (en) | 1995-09-13 |
| JP2752585B2 (en) | 1998-05-18 |
| TW259722B (en) | 1995-10-11 |
| CN1122262A (en) | 1996-05-15 |
| DE4326605A1 (en) | 1995-02-09 |
| KR0148400B1 (en) | 1998-11-16 |
| US5894935A (en) | 1999-04-20 |
| JPH07155638A (en) | 1995-06-20 |
| CN1056787C (en) | 2000-09-27 |
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