EP2351616A1 - Dispositif de traitement de poudre avec brassage du milieu - Google Patents

Dispositif de traitement de poudre avec brassage du milieu Download PDF

Info

Publication number
EP2351616A1
EP2351616A1 EP09809693A EP09809693A EP2351616A1 EP 2351616 A1 EP2351616 A1 EP 2351616A1 EP 09809693 A EP09809693 A EP 09809693A EP 09809693 A EP09809693 A EP 09809693A EP 2351616 A1 EP2351616 A1 EP 2351616A1
Authority
EP
European Patent Office
Prior art keywords
stirring
container
medium
powder
gas
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.)
Withdrawn
Application number
EP09809693A
Other languages
German (de)
English (en)
Other versions
EP2351616A4 (fr
Inventor
Masayoshi Kawahara
Masahiro Yoshikawa
Takashi Shibata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hosokawa Alpine AG
Original Assignee
Hosokawa Alpine AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hosokawa Alpine AG filed Critical Hosokawa Alpine AG
Publication of EP2351616A1 publication Critical patent/EP2351616A1/fr
Publication of EP2351616A4 publication Critical patent/EP2351616A4/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • 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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/10—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and axial flow
    • B02C13/12—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and axial flow with vortex chamber
    • 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
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • 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
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • 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
    • B02C17/161—Arrangements for separating milling media and ground material
    • 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
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • 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
    • B02C17/18—Details
    • B02C17/24—Driving mechanisms

Definitions

  • the present invention relates to an apparatus for powder processing by stirring a medium in which the material to be processed is stirred together with a medium in a container and thereby ground.
  • Stirring mills and ball mills are known from the prior art, which have freely rotatably mounted in the longitudinal axis stirring elements which protrude in one or more stages in the radial direction outwardly from the stirring axis; At this time, the material to be processed is agitated by the stirring members together with a medium in a container and thereby ground (see, for example, Patent Documents 1-4 below).
  • the medium in the container is stirred by rotation of the stirring elements about the longitudinal axis.
  • the material to be processed by the grinding forces occurring in the medium, ie shear forces, impact forces, compressive forces, friction, etc., ground.
  • Such stirring mills are also known in which classifiers are mounted at the top of the container and classify, sort and collect the finished-ground material (fine powder) according to particle diameter.
  • the stirring mills mentioned in the above-mentioned patent documents 1 and 2 are examples thereof.
  • the stirring mills mentioned in Patent Documents 1 and 2 have openings at the bottom of the container for admitting a gas flow; in the container, the ground fine powder rises through the gas flow admitted at the bottom of the container and is directed to the classifier. As a result, unnecessary residence times of the finely ground fine powder are reduced in the container and actively prevents agglomeration of the fine powder, which in turn allows an increase in the grinding efficiency.
  • the container has a bevel at the top, which approaches the center at the top and depends on the height of the lower edge of the uppermost stirring element 5 or extends upwards from a lower position.
  • the stirring mill mentioned in Patent Document 3 has an upper stirring member (upper agitator) and a lower stirring blade which are rotatably mounted relative to each other; the upper stirrer and the lower stirrer blade are rotated at opposite speeds in opposite directions.
  • the inner surface of the container is formed as a slope, whose diameter gradually decreases towards the top.
  • a centrifugal force acts on the medium agitated by the rotation of the stirring members about the longitudinal axis and rotating in the container; with the rotation about the longitudinal axis in the container, it pushes against the inner wall of the container and thereby rises up to this in the upper region of the container. Then it descends by gravity on the inside of the container and down again; This movement is repeated constantly.
  • the inner wall of the containers is formed at the level of the stirring elements mounted in a plurality of stages (here, in particular, the upper edge of the uppermost stirring element) as a vertical plane perpendicular to the bottom surface.
  • the grinding forces can be increased by increasing the stirring speed;
  • an increase in the stirring speed leads to a sharp rise of the medium at the vertical plane, as a result of which the medium drives strongly up to the surface between ascending and descending.
  • the energy applied to agitate the medium is not sufficiently converted into grinding energy; it comes to greater energy losses.
  • any further increase in the stirring speed leads to an increased buoyancy of the medium on the inner walls of the container and thus to a reduction of the grinding efficiency.
  • the stirring mill mentioned in Patent Document 4 is a wet mill as described above.
  • agitating mills which are designed as wet mills, differs, as indicated in the drawing for patent document 4 by arrow A, the behavior of the medium and the material to be processed in the container of the dry mills. Therefore, the problem inherent in stirring mills, mentioned in Patent Documents 1-3, that the powder milling efficiency is reduced by the medium rising above the inner wall of the container to the surface, occurs with stirring mills, which are wet mills, as exemplified by the patent document 4, barely up.
  • the material to be processed is supplied as a suspension, the finely ground fine powder must be dried by appropriate processes and any clumped fine powder after drying must be dissolved to obtain a dry powder. The efficiency of processing to obtain a dry powder having the desired particle diameter is therefore necessarily low in comparison with stirring mills designed as dry mills.
  • the object of the present invention is, in view of the above-mentioned problems, in the context of a device for powder processing by stirring a medium in which the material to be processed is stirred together with a medium in the container by means of stirring elements and thereby ground and in the finished powder over collecting a classifier to increase the efficiency of the overall processing from grinding the material to be processed to classifying and collecting the finished powder.
  • a device for powder processing by stirring a medium having over the longitudinal axis freely rotatably mounted stirring elements which project in one or more steps in the radially outward direction from the stirring axis according to the present invention, through which the processing material is stirred and ground together with the medium in the container, and the finished powder is classified and collected via a classifier mounted in the top of the container;
  • the inner wall of the container has a slope which approaches the center towards the top and extends upwards from the height of the lower edge of the uppermost stirring element or from a lower position.
  • the inside of the container is at least at the level of the lower edge of the uppermost stirring element designed as a slope which approaches the center towards the top, whereby the stirred by the stirring elements and under the action of a centrifugal force medium when hitting the Inner wall of the container (on the slope) in the height range of the upper stirring element (height range from the lower edge to the upper edge) a force acting obliquely downward.
  • the buoyancy acting on the medium pushed up by the action of the centrifugal force on the inner wall can be reduced and excessive drifting of the medium in the container to the surface be suppressed.
  • the energy applied for stirring the medium can be effectively converted into grinding energy and the milling efficiency can be increased.
  • the material to be processed and the finished powder By driving the medium to the surface, the material to be processed and the finished powder easily adhere to the corresponding locations on the inner wall.
  • the driving of the medium to the surface can be suppressed, adhesion of the material to be processed and the finished powder to the inner wall can also be prevented.
  • the differences in height between the inner wall of the container and the inside of the container can be further determined from the medium, the material to be processed and the finished powder (hereinafter "powder and medium"). reduce the envelope area formed.
  • the flow rate of the gas for transporting the ready-milled powder can be standardized and, in turn, the transport of the powder to the classifier can be improved.
  • the efficiency of the overall processing can be increased from grinding the material to be processed to collecting the finished powder through the classifier.
  • the slope ideally extends from the bottom of the container.
  • the buoyancy of the medium in the height range of the stirring elements can be reliably reduced, with the result that an excessive driving of the medium in the container to the surface is substantially suppressed. This, in turn, significantly increases the efficiency of processing the powder.
  • the stirring elements are in this case formed in several stages on the stirring axis, wherein the length from the center of the stirring axis to the edge of the uppermost stirring element is ideally chosen shorter than the length to the edge of the next lower stirring element.
  • This structure makes it possible to rotate the stirring elements at a uniform angular velocity and to keep the peripheral speed at the edge of the uppermost stirring element lower than the peripheral speed at the edge of the next lower stirring element. As a result, the centrifugal force acting on the medium by the upper stirring member can be reduced. Ultimately, this can reduce the buoyancy in the container and suppress the driving of the medium to the surface.
  • said structure between the upper edge of the stirring axis and the lower edge of the classifier ideally has an intermediate element.
  • This structure makes it possible to raise the gas for transporting the finished powder to the classifier in the region of the intermediate element with approximately uniform speed. This can be done efficiently transporting ground powders to the classifier which, in turn, significantly increases the efficiency of the overall processing from powder grinding to classifying.
  • the container on the side surfaces in the circumferential direction ideally has openings which radiate gas radially inward.
  • This structure makes it possible to increase the dispersibility in the region in which powder and medium are stirred in the container (in the stirring region) through the gas emitted from the corresponding openings, and thereby the ready-milled powder which is to be processed in the medium or in the process Material is to be removed from the stirring area and transported in the upper area of the container.
  • unnecessary residence times of the finished powder in the stirring region can be reduced, whereby excessive grinding of the material to be processed can be avoided and the efficiency of the entire processing in the container can be increased.
  • the device 1 for powder processing by stirring a medium according to the present embodiment is constructed such that the material to be ground in the container 2 is stirred and ground by stirring elements 5 together with medium 6 and the finely ground fine powder on the top of the container. 2 mounted Klassierrotor 10 is collected.
  • Fig. 1 shows the structure of a device 1 for powder processing by stirring a medium according to the present embodiment.
  • Fig. 2 serves to explain the forces acting on the inner wall of the container 2 on the medium 6.
  • Fig. 3 schematically shows the envelope formed in the container 2.
  • the device 1 for powder processing by stirring a medium has, as in Fig. 1 Shown in the container 2 stirring elements 3, a medium 6, a bottom plate 7 and serving as classifier Klassierrotor 10 and attached to the side surfaces of the container 2 Verströmungsö réelleen 13, a mounted on the outer circumference of the container 2 casing 16 and gas inlet openings 17.
  • an opening 8 is attached to the material supply above; The material is supplied via a screw conveyor 9 connected upstream of this opening 8.
  • the container 2 has on the inner wall a slope 21 which approaches the center towards the top.
  • a plurality of stirring elements 5 protrude outward in a plurality of stages in the radial direction.
  • the stirring elements 5 are thus freely rotatably mounted in the container 2 about the longitudinal axis (center of the rotation axis Z); by rotation about the longitudinal axis (center of the rotation axis Z), the material to be processed, ie the material to be ground, is stirred and ground together with the medium 6.
  • the length from the center of the rotation axis Z to the edge of the stirring member 5 (hereinafter sometimes referred to as "stirring diameter") is selected to be shorter in each stage than in the stirring member 5 of the next lower stage.
  • the stirring diameter of the stirring elements 5 is thus selected so that it decreases towards the upper stages. Further, in the present embodiment, the clearance between the edge of the stirring member 5 and the below-mentioned inner wall of the container 2 (specifically, the slope 21) is uniformly wide at all stages. So that the medium 6 can not jam between the stirring elements 5 and the inner wall of the container 2, the clearance C is preferably at least four times as wide as the diameter of medium 6, with deviations of at most one third. With “uniformly wide" in relation to the free space C, no exact match is required, but rather that the free space is approximately the same width on all levels.
  • a suitable material is selected for the medium 6, for example metals such as stainless steel or ceramic.
  • a material of high Density used to maximize the impact forces occurring in the medium 6 is preferably a material of high Density used.
  • the size of the medium 6 is suitably selected depending on the particle diameter of the fine powder to be discarded. However, since generally a small diameter also leads to a reduction of the impact forces occurring in the medium 6, but on the other hand a larger diameter reduces the contact points and thus the impact frequency and thus complicates the grinding, taking into account these two factors, preferably a medium 6 with a diameter used from 2-6 mm. Taking into account the fact that the diameter of the medium 6 gradually decreases in the course of use due to long-term abrasion, ideally for the diameter a value of approximately 5-6 mm should initially be selected.
  • the bottom plate 7 is a disc-shaped member located on the bottom of the container 2, covering the area from the center to the inner wall.
  • the bottom plate 7 divides the interior of the container 2 in the two areas powder processing chamber P and gas space G.
  • the powder processing chamber P so the space in the container 2 from the bottom plate 7 to the classifying rotor 10, is the space in which the ground material together with the medium 6 is stirred and ground by the stirring elements 5;
  • the gas space G is the space temporarily receiving the gas flow supplied via the gas inflow passage 15a.
  • air is normally used for the gas flow.
  • shielding gases such as nitrogen, helium and argon may also be used if, for example, the material is unstable to oxygen.
  • the gas stream can also be cooled, heated or moistened or introduced via filters, etc.
  • the bottom plate 7 has gas-permeable openings 7a.
  • perforated plates such as plates having slit-shaped openings, punched perforated plates and perforated plates may be used.
  • the openings 7a in the bottom plate 7 the gas flow from the gas space G is admitted into the powder processing chamber P; Through this gas flow, the fine powder ground in the powder processing chamber P rises and is sent to the classifying rotor 10.
  • the openings 7a have a large total area.
  • the container 2 has at the top of the side surfaces via an opening 8 for supplying material.
  • the feeding of the ground material into the interior of the container 2 takes place via an opening 8 for material supply upstream screw conveyor 9.
  • a screw conveyor 9 is ideally used when the material is a solid, in particular powder, and the material with uniform Speed should be supplied constant.
  • a screw conveyor can also double flaps, rotary valves, etc. be used.
  • the screw conveyor or other equipment for supplying material need not necessarily be connected directly to the opening 8 for supplying material; Rather, the material can also be supplied via pneumatic transport tubes.
  • the inside of the container 2 is divided by the bottom plate 7 into gas space G and powder processing chamber P;
  • gas space G over the surface of the bottom plate 7 Verströmungsö réelleen 13 and in the container 2 above a to the (not shown in the figure) rotation axis rotating Klassierrotor 10 is mounted.
  • the gas flows into the powder processing chamber P through the openings 7a attached to the bottom plate 7; the corresponding openings 13 emit gas into the powder processing chamber P.
  • the interior of the powder processing chamber P is formed of a stirring region R in which the medium 6 is stirred and an overlying classifying region Q.
  • the fine powder stirred and ground in the stirring region R together with the medium 6 by the agitating elements 5 is carried up to the classifying region Q by a carrier gas serving for the transport thereof.
  • carrier gas is meant herein either the gas stream or the incoming gas, or both.
  • the classifying rotor 10 has a plurality of radially mounted classifying blades 10a.
  • the classification of the fine powder is effected by the interaction of the centrifugal force generated by the rotation of the classifying rotor 10 in the radial direction and the influx of gas into the classifying rotor 10.
  • the rotational speed of the classifying rotor 10 is selected according to the particle diameter of the obtained finished processed powder.
  • the classifying rotor 10 forms the classifier according to the invention.
  • the container 2 has on the inner wall a slope 21 which approaches the center upwards; in the present embodiment, the slope 21 extends from the bottom of the container. In the present example, the slope 21 extends from the bottom plate 7. As a result, the inner wall of the container 2 is formed at the height of all stirring elements 5 as a slope 21.
  • the slope 21 has a uniform angle; the container as a whole is designed as a cone with a cut tip. In this case, the helix angle deviates from the vertical preferably by 3-35 degrees and particularly preferably by 6-35 degrees. A skew angle of 6-25 degrees is even more preferred; 11 degrees are ideal.
  • the lengths of the agitating elements 5 are selected so that the length from the center of the rotation axis Z to the edge of the agitating elements 5 (the agitation diameter) increases at the top.
  • the stirring axis 4 rotates at a uniform angular velocity, therefore, the peripheral speed at the edge of the stirring elements 5 also decreases in the upward direction.
  • the stirring region R of the medium 6 thereby also takes the centrifugal force F acting on the medium 6 by the stirring elements 5 (see Fig. 2 ) upwards from each. Also by this mechanism, driving of the medium 6 in the container 2 to the surface is suppressed.
  • the energy applied for stirring the medium 6 can be effectively utilized as grinding energy.
  • the grinding efficiency over powder processing apparatus can be increased by stirring a prior art medium whose containers 2 are formed with a straight cross section.
  • the differences in height of the enveloping surface 24 formed of powder and medium can be reduced (see Fig. 3 ; the dot-dot dashed line shows the situation when the container is formed 2 with a straight cross-section) by suppressing excessive driving of the medium 6 to the surface; the between the inner wall of the container 2 and the center of the container 2 existing permeability to the carrier gas can also be reduced.
  • the flow openings 13 are attached to the side surfaces of the container 2 in the circumferential direction so that gas can be flowed inward in the radial direction.
  • slit-shaped flow openings 13 are provided on the entire circumference of the side surfaces of the container 2 above the surface of the bottom plate 7. It can also be chosen a different structure in which gas from several points of approximately uniformly in the radial direction can be exuded inwardly, for example, by multiple Verströmungsö réelleen 13 are arranged approximately uniformly distributed in the circumferential direction, or by perforated elements o.ä. 2 Verströmungsö Maschinenen 13 are arranged on the entire circumference of the container.
  • the same gas can be used as for the admitted gas stream; As previously explained, air or an inert gas such as nitrogen may be used.
  • the inflowing gas can also be regulated in temperature, humidity, etc. or via filters or similar. be initiated.
  • the gas flow supplied via the gas supply channel 15 is distributed to the two supply channels Gaszuströmkanal 15a and 15 Gaseinströmkanal; Subsequently, the gas flows from the openings 7a in the bottom plate 7 and the outflow openings 13 into the container 2 (powder processing chamber P).
  • the gas flowing in from the outflow openings 13 in the stirring region R fulfills the function of separating the finely ground fine powder, which is in the medium 6 or in the millbase, from the stirring region R and transporting it into the upper region of the container 2.
  • unnecessary residence times of the fine powder in the stirring region R of the container 2 can be reduced, thereby avoiding excessive grinding of the fine powder and increasing the efficiency of the entire processing from grinding to classifying.
  • the vents 13 are disposed above the surface of the bottom plate 7, fines and sticking of the fine powder in the corner between the inside wall of the container 2 and the bottom plate 7 can be prevented.
  • the container 2 has on the outer circumference of an annular channel 14 which covers the Verströmungsö Maschinennnen 13.
  • the annular channel 14 in this case connects the gas inflow channel 15b, which supplies the gas to the flow openings 13, and the openings 13.
  • the space thus formed in the interior of the annular channel 14 fulfills the function which is supplied via the gas inflow channel 15b from the openings 13 into the container 2 to temporarily absorb incoming gas. That over the Gas inflow passage 15b supplied incoming gas is supplied to the flow openings 13 after a pressure equalization in the annular channel 14.
  • the inflowing gas can be emitted approximately uniformly via the openings 13. This in turn means that the fine powder in the container 2 can disperse uniformly and the efficiency of the entire processing can be significantly increased.
  • the side surfaces of the container 2 above the stirring elements 5 have gas inlet openings 17, via which the gas flows in from the side surfaces of the container 2 inwards.
  • the gas inlet openings 17 may for example be slit-shaped, so that the gas flows in from the side surfaces of the container 2 over the entire circumference upwards.
  • the structure may also be designed so that numerous slanted in the tangential direction sheets attached to the entire circumference of the container 2 or the gas inlet openings 17 are mounted in the direction tangential to the container 2, so that the gas flows in a circular motion.
  • the same gas can be used as for the gas leaked and the inlet gas stream; As previously explained, air or an inert gas such as nitrogen may be used.
  • the inflowing gas can also be regulated in temperature, humidity, etc. or via filters or similar. be initiated.
  • the gas flowing in via the gas inlet openings 17 serves not only to prevent adhesion of the fine powder to the inner wall of the container 2, but at the same time also fulfills a function as a dispersion gas for classifying.
  • the jacket 16 is attached to the outer periphery of the container 2 and serves as a thermostat for arbitrarily controlling the temperature in the container 2.
  • cooling water is passed through the jacket 16 to cool the container 2. Even if cooling air is introduced into the container 2, such as through the openings 13, to keep the temperature inside relatively low level, it may occur in the operation of the powder processing apparatus 1 by stirring a medium that the temperature on the inner wall of the container 2 rises and adhering to the inner wall regrind or fine powder is damaged by the heat.
  • the powder processing apparatus 1 of the present embodiment can also be effectively used for grinding material which is easily damaged or degenerated by heat.
  • an intermediate member 12 is mounted between the upper edge 4u of the stirring axis 4 and the lower edge 10d of the classifying rotor 10.
  • the intermediate member 12 is an approximately cylindrical member which is formed approximately the same as the upper edge 4u of the agitating shaft 4 and coupled to the agitating shaft 4.
  • the upper edge 12u of the intermediate member 12 coupled to the stirring axis 4 and the lower edge 10d of the classifying rotor 10 are arranged close to each other.
  • the classifying region Q located above the stirring region R thereby forms an annular space in cross-section.
  • an intermediate member 12 is attached to fill the space formed between the upper edge 4u of the stirring axis 4 and the lower edge 10d of the classifying rotor 10.
  • the classifying area Q forms, in cross section, an annular space filled in the middle; since the passage area is approximately the same throughout the classifying area Q, the carrier gas and the fine powder transported thereby rise at an approximately uniform speed.
  • the fine powder can be efficiently transported to the classifying rotor 10, which in turn can significantly increase the efficiency of the entire processing from grinding to classifying.
  • the processing was constant with a total air flow (gas flow, inflowing gas and inflowing gas) of 10 m 3 / min and a stirring element speed of 120 U / min.
  • the classification speed of the classifying rotor 10 was 3000 rpm and 7000 rpm, respectively; the equivalent diameter was determined from the specific surface area by BET measurement; the processing capacity was determined as a processing amount per unit time. The results are shown in Table 1.
  • Processing was constant with a total air flow of 10 m 3 / min, a stirrer speed of 120 rpm and a classification speed of 7000 rpm; the average particle diameter was determined by laser diffractometry / laser diffraction spectrometry; the processing capacity was determined as a processing amount per unit time; the milling efficiency was determined by dividing the processing capacity by the amount of energy used for milling processing.
  • the results are in Fig. 4 and Table 2.
  • Table 2 the grinding efficiency at the individual skew angles is given as "relative grinding efficiency" in comparison with the grinding efficiency at a helix angle ⁇ of 0 degrees.
  • the grinding efficiency of the conical container was higher at certain helix angles on the inner wall.
  • the tapering efficiency of the cone-shaped container in the helix angle range 21 between 3 and 35 degrees was about 11 percent higher than that of a cylindrical container; in the helix angle range between 6 and 35 degrees, the grinding efficiency was about 21 percent higher; in the skew angle range between 6 and 25 degrees, the grinding efficiency was about 43 percent higher; Finally, with a helix angle of 11 degrees, the grinding efficiency was even 54 percent higher. The grinding efficiency was thus higher at all stages than with a cylindrical container.
  • Zirconium balls with a diameter of 5.0 mm were used as medium 6, glass dust (average particle diameter 33 ⁇ m) was used as the ground material. Processing was constant with a total air flow of 10 m 3 / min, a stirrer speed of 130 rpm and a classification speed of 3000 or 7000 rpm; the average particle diameter was determined by laser diffractometry / laser diffraction spectrometry; the processing capacity was determined as a processing amount per unit time. The results are shown in Table 3.
  • the slope 21 has a uniform helix angle having.
  • embodiments of the present invention are not limited to this case.
  • the slope 21 is formed such that its helix angle increases toward the top.
  • the inner wall of the container 2 is formed as a slope 21.
  • the slope 21 can also be formed by the fact that in a container 2 of straight cross-sectional shape inside a separate element is attached.
  • the inner wall may also have a straight cross section above the height at which the driving of the medium is suppressed to the surface instead of an oblique cross section.
  • the outer diameter of the classifying rotor 10 is preferably between 1.3 and 2 times as large as the inner diameter of the straight portion at the top of the container 2.
  • a lower value is preferably selected for the peripheral speed at the edge of the uppermost stirring element 5 than for the other stirring elements 5, so that therefore at least the agitating diameter at the uppermost stage is chosen smaller than the agitating diameter at the next lower stage, and the agitating diameter at the other stages for each stage is chosen smaller than the agitator diameter at the next lower stage or the same size.
  • the agitator diameter is the same up to the third lowest level and decreases from there to the top.
  • the stirring diameter is preferably matched to the shape of the inner wall of the container 2, so that the clearance C between the edge of the stirring member 5 and the inner wall of the container 2 is approximately uniformly wide at all stages.
  • the stirrer diameter can also be chosen to be the same size for all stages or, for some stages, larger than the stirrer diameter of the next lower stage.
  • each two agitating elements 5 there been assumed that five stages are attached to each two agitating elements 5 at the same height, each step being offset from one another by 90 degrees as in a houndstooth pattern.
  • the number of stages or the number of stirring elements 5 per stage can therefore be chosen freely. If there is only one stage stirring elements 5, then this corresponds to the "top level”.
  • the offset angle when arranged as in a houndstooth pattern is also freely selectable.
  • the stirring elements 5 may be round, elliptical, polygonal (approximately quadrangular) or otherwise shaped in cross section; their edges may also be paddle-shaped.
  • vents 13 are attached to the side surfaces of the container 2 above the surface of the bottom plate 7.
  • embodiments of the present invention are not limited to this case.
  • the invention can also be carried out so that the Verströmungsö réelleen 13 are attached to the side surfaces of the container 2 in the middle stirring region R of the medium 6.
  • the dispersion efficiency of the fine powder in the container 2 can be increased by carrying the finish-ground fine powder up to the upper portion of the container 2.
  • a gas flow classifying rotor 10 which serves as a classifier, is centrally mounted in the upper part of the container 2, rotating around the longitudinal axis.
  • a classifying rotor 10 rotating about the transverse axis can also be used.
  • several rotating about the transverse axis classifying rotors 10. Such a structure is suitable when the above-mentioned container 2 at least partially has a straight cross-section.
  • a plurality of classifying rotors 10 are used simultaneously and form a unit via a collecting pipe (or a collecting pipe 11); to this manifold 11, the intermediate element 12 is coupled.
  • the Klassierrotoren 10 and the manifold 11 in their entirety form a "classifier"; the upper edge 4u of the stirring axis 4 and the lower edge 12d of the intermediate element 12 coupled to this classifier are arranged close to one another.
  • a supporting element emanating from container 2 can also be used for support.
  • the diameter of the intermediate member 12 decreases upward; However, it may also, depending on the outer diameter of the stirring axis 4 and the Klassierrotors 10, or to accelerate the rate of rise of the carrier gas, a suitable other structure may be used in which approximately the outer diameter of the intermediate member 12 increases towards the top, or a cylindrical structure with above and below the same diameter.
  • Example 4 The relationship between classification speed, average particle diameter of the obtained finished processed powder, and processing capacity in this case is shown in Table 4.
  • the experimental conditions correspond to those in experiment 3 described above.
  • the stirring axis 4 is approximately cylindrically shaped.
  • the stirring axis 4 may be formed with the diameter increasing toward the top, that is, conversely, tapered.
  • a greater part of the depression in the middle of the enveloping surface 24 formed by powder and medium can be filled by the stirring axis 4, whereby the permeability gradient with respect to the carrier gas between the inner wall of the container 2 and the interior of the container 2 are substantially reduced can.
  • the flow velocity of the carrier gas rising in the container 2 can be standardized, whereby the efficiency of the entire processing from grinding to classifying can be substantially increased.
  • the container 2 is cooled by passing cooling water through the jacket 16 serving as a thermostat.
  • the fine powder can be dried during grinding by passing a heat carrier heated to the desired temperature through the jacket 16 and thereby heating the container 2.
  • a heat carrier about hot water steam or oil can be used as a heat carrier about hot water.
  • the powder processing powder processing apparatus 1 of the present invention finds application in the milling processing.
  • embodiments of the present invention are not limited to this case.
  • the present invention may be used, for example, in surface processing, pelleting or planing, in the production of composites, in precision mixing, and in drying or other powder processing.
  • the apparatus 1 for powder processing by stirring a medium of the present invention may be preferably used for the processing of inorganic compounds such as: lithium compounds such as lithium carbonate, lithium hydroxide, lithium nickel dioxide, lithium cobalt dioxide and lithium manganese dioxide; Sodium compounds such as sodium sulfate (Glauber's salt), sodium hydroxide, sodium carbonate, sodium hydrogencarbonate, sodium nitrite, sodium sulfite, sodium sulfide, sodium silicate, sodium nitrate, sodium bisulfate, sodium thiosulfate and saline; Magnesium compounds such as magnesium sulfate, magnesium chloride, magnesium oxide, magnesium carbonate, magnesium acetate, magnesium nitrate and magnesium hydroxide; Aluminum compounds such as aluminum hydroxide, aluminum sulfate, polyaluminum chloride, alumina, alum, aluminum chloride and aluminum nitride; Silicon compounds such as silicon oxide, silicon nitride, silicon carbide, calcium silicate, magnesium si
  • the present invention may be used in addition to the above-mentioned scope, preferably in apparatuses for powder processing by stirring a medium for the production of, for example, metallic and ceramic powders and cereal powders, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP20090809693 2008-08-25 2009-06-30 Dispositif de traitement de poudre avec brassage du milieu Withdrawn EP2351616A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008215717A JP5451006B2 (ja) 2008-08-25 2008-08-25 媒体攪拌型粉体処理装置
PCT/JP2009/061930 WO2010024038A1 (fr) 2008-08-25 2009-06-30 Dispositif de traitement de poudre avec brassage du milieu

Publications (2)

Publication Number Publication Date
EP2351616A1 true EP2351616A1 (fr) 2011-08-03
EP2351616A4 EP2351616A4 (fr) 2013-03-06

Family

ID=41721212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090809693 Withdrawn EP2351616A4 (fr) 2008-08-25 2009-06-30 Dispositif de traitement de poudre avec brassage du milieu

Country Status (5)

Country Link
EP (1) EP2351616A4 (fr)
JP (1) JP5451006B2 (fr)
KR (2) KR20110065460A (fr)
CN (1) CN102131586A (fr)
WO (1) WO2010024038A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013167851A1 (fr) * 2012-05-10 2013-11-14 Belmonte Investments Limited Broyeur par frottement et son procédé d'utilisation
DE202017003318U1 (de) 2017-06-23 2017-08-01 Hosokawa Alpine Aktiengesellschaft Rotor für Rührwerksmühlen
EP4464963A4 (fr) * 2023-04-03 2026-02-18 Contemporary Amperex Technology Hong Kong Ltd Dispositif de broyage et de séchage

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014057851A1 (fr) * 2012-10-10 2014-04-17 ホソカワミクロン株式会社 Dispositif de séchage pneumatique
JP6317891B2 (ja) * 2013-05-29 2018-04-25 日本コークス工業株式会社 乾式メディア撹拌型粉砕機
CN104056694B (zh) * 2014-06-20 2016-08-24 重庆环德科技有限公司 一种可实现精密分散的砂磨机
US10393436B2 (en) * 2014-11-19 2019-08-27 Minex Crc Ltd Drying apparatus and related method
CN106732949B (zh) * 2016-12-27 2018-09-18 安徽杨柳青钙业科技股份有限公司 一种增压动流式干粉搅拌粉碎装置
CN108568237A (zh) * 2018-04-16 2018-09-25 合肥图腾龙机械设计有限公司 一种饲料粉碎混合装置
CN109225465A (zh) * 2018-10-11 2019-01-18 甘肃驰奈生物能源系统有限公司 一种餐厨垃圾破碎、筛分、风选一体设备
CN109759184B (zh) * 2019-02-19 2021-09-28 徐金涛 一种利用废旧成品皮革提取胶原纤维的方法及设备
CN112297269B (zh) * 2020-10-09 2022-05-13 青岛汇天隆工程塑料有限公司 一种环保轻量化工程塑料制备工艺
CN112691629A (zh) * 2020-10-16 2021-04-23 卫红红 一种涂料加工用高温催化反应釜
JP7707747B2 (ja) * 2021-08-23 2025-07-15 新東工業株式会社 処理装置及び処理方法
KR102386275B1 (ko) * 2021-11-19 2022-04-14 안태철 기류식 하부이동식 분급분쇄기
US20250041874A1 (en) * 2022-01-04 2025-02-06 Loesche Gmbh Classifier arrangement for a vertical roller mill
CN115011232B (zh) * 2022-06-02 2023-05-16 无锡市英波化工有限公司 一种脂肪族聚氨酯高级面漆及其工艺系统
WO2024135115A1 (fr) * 2022-12-19 2024-06-27 株式会社トクヤマ Procédé d'agitation, dispositif de transfert de chaleur d'agitation, et dispositif de réaction

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1188913B (de) * 1961-01-25 1965-03-11 Draiswerke Ges Mit Beschraenkt Ruehrwerksmuehle
JPS59102452A (ja) 1982-11-30 1984-06-13 大久保　敏之 竪型ボ−ルミル
JPS63107737U (fr) * 1986-12-29 1988-07-12
IT1208868B (it) * 1987-04-15 1989-07-10 Antonio Pelizza Mulino verticale a microsfere perfezionato particolarmente per la dispersione di pigmenti in veicolo fluido
JP2918679B2 (ja) * 1990-11-27 1999-07-12 ホソカワミクロン株式会社 乾式媒体ミル
JP4010833B2 (ja) 2002-03-18 2007-11-21 三井鉱山株式会社 乾式メディア撹拌型粉砕機
JP2005199124A (ja) 2004-01-13 2005-07-28 Mitsui Mining Co Ltd メディア攪拌型粉砕機
JP2005270780A (ja) * 2004-03-24 2005-10-06 Mitsui Mining Co Ltd 乾式メディア攪拌型粉砕機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013167851A1 (fr) * 2012-05-10 2013-11-14 Belmonte Investments Limited Broyeur par frottement et son procédé d'utilisation
DE202017003318U1 (de) 2017-06-23 2017-08-01 Hosokawa Alpine Aktiengesellschaft Rotor für Rührwerksmühlen
EP4464963A4 (fr) * 2023-04-03 2026-02-18 Contemporary Amperex Technology Hong Kong Ltd Dispositif de broyage et de séchage

Also Published As

Publication number Publication date
CN102131586A (zh) 2011-07-20
EP2351616A4 (fr) 2013-03-06
JP2010046646A (ja) 2010-03-04
KR20130111643A (ko) 2013-10-10
KR20110065460A (ko) 2011-06-15
JP5451006B2 (ja) 2014-03-26
KR101431045B1 (ko) 2014-08-21
WO2010024038A1 (fr) 2010-03-04

Similar Documents

Publication Publication Date Title
EP2351616A1 (fr) Dispositif de traitement de poudre avec brassage du milieu
DE4447321C2 (de) Rührwerksmühle für die nasse Feinzerkleinerung, mit Separator zur Zurückhaltung von Mahlperlen
DE69513100T2 (de) Feinmahlanlage
DE69618431T2 (de) Mechanischer Zerkleinerungsapparat
EP1919624B1 (fr) Broyeur-secheur et procede pour secher une matiere broyee
DE4323587C2 (de) Verfahren und Einrichtung zum Zerkleinern von Material unterschiedlicher Körnung
EP3223934B1 (fr) Dispositif de traitement et de refroidissement de sable de fonderie
EP0347948A2 (fr) Broyeur à plusieurs étages
CH647422A5 (de) Ruehrwerksmuehle zum zermahlen einer prozessmischung.
DE2848479A1 (de) Ruehrwerkskugelmuehle
DD236462A5 (de) Ringspalt-kugelmuehle
DE69410667T2 (de) Distanzelement für die Schleifrolle einer Getreidepoliermaschine
EP3988214A1 (fr) Broyeur à jets opposés à lit fluidisé destiné à la génération de fines particules à partir de matière de chargement à faible densité et procédé associé
DE1782775B2 (de) Drehluftsichter. Ausscheidung aus: 1507683
EP3541535B1 (fr) Séparateur à air et broyeur équipé de ce dernier
DE8217579U1 (de) Pulvermuehlen-vorrichtung
EP3603811B1 (fr) Procédé et installation de broyage
EP3895806A1 (fr) Dispositif et procédé de broyage de matières solides
DE19520325A1 (de) Sichtermühle
EP3849714B1 (fr) Roue de triage à éléments de voile plats et procédé de tamisage avec une telle roue
EP0556645B1 (fr) Broyeur à marteaux
DE3602786C2 (fr)
DE3729317C2 (fr)
DE1296950B (de) Kontinuierlich arbeitende Ruehrwerksmuehle
DE69525334T2 (de) Reibmühle

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110325

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20130206

RIC1 Information provided on ipc code assigned before grant

Ipc: B02C 17/16 20060101AFI20130131BHEP

Ipc: B02C 17/18 20060101ALI20130131BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20150402

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20150813