EP2024093B1 - Verfahren zur erzeugung feinster partikel mittels einer strahlmühle - Google Patents

Verfahren zur erzeugung feinster partikel mittels einer strahlmühle Download PDF

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Publication number
EP2024093B1
EP2024093B1 EP07722451A EP07722451A EP2024093B1 EP 2024093 B1 EP2024093 B1 EP 2024093B1 EP 07722451 A EP07722451 A EP 07722451A EP 07722451 A EP07722451 A EP 07722451A EP 2024093 B1 EP2024093 B1 EP 2024093B1
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EP
European Patent Office
Prior art keywords
jet mill
grinding
grinding gas
housing
wheel
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.)
Active
Application number
EP07722451A
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German (de)
English (en)
French (fr)
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EP2024093A1 (de
Inventor
Roland Nied
Hermann Sickel
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.)
Nied Roland Dr-Ing
Netzsch Condux Mahltechnik GmbH
Original Assignee
Nied Roland Dr-Ing
Netzsch Condux Mahltechnik GmbH
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Application filed by Nied Roland Dr-Ing, Netzsch Condux Mahltechnik GmbH filed Critical Nied Roland Dr-Ing
Publication of EP2024093A1 publication Critical patent/EP2024093A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone

Definitions

  • the present invention relates to a method for producing finest particles by means of a jet mill.
  • the material to be sighted or ground consists of coarser and finer particles which are entrained in an air stream and form the product stream which is introduced into a housing of a wind sifter of the jet mill.
  • the product flow passes in the radial direction into a classifying wheel of the air classifier.
  • the coarser particles are eliminated from the air stream and the air stream leaves the classifying wheel with the fine particles axially through a discharge pipe.
  • the air flow with the fine particles to be filtered out or produced can then be supplied to a filter in which a fluid, such as air, and fine particles are separated from each other.
  • Such a jet mill is known, in the grinding chamber further at least one high-energy jet jet of hot steam with high flow energy is introduced, wherein the grinding chamber except the inlet means for the at least one grinding jet has an inlet for the material to be ground and an outlet for the product, and wherein in the area of the coincidence of regrind and at least one grinding jet of hot steam and millbase have at least about the same temperature.
  • EP0211117 is an air classifier known in which compressed gases are used with pressures of up to 6.2 bar.
  • the present invention therefore has the aim of further optimizing a method for producing very fine particles by means of a jet mill.
  • a method for producing very fine particles by means of a jet mill using compressed gases as the grinding gas is characterized in that the grinding gas has a pressure of ⁇ 4.5 bar (abs).
  • a preferred development is that the grinding gas is subjected to a jet milling of inorganic substances.
  • the method may preferably be further developed in that the temperature of the ground gas is> 100 ° C, wherein it is provided in particular that the temperature of the ground gas in the range of about 180 ° C to about 200 ° C.
  • a fluid bed jet mill or a dense bed jet mill is used.
  • the determination of the two energy consumptions and their comparison preferably takes place at each start of operation or resumption of operation of the jet mill. It is particularly advantageous if the determination of the two energy consumptions and their comparison is carried out automatically. It is particularly advantageous if an operating mode setting also takes place automatically according to the result of the comparison.
  • the air classifier contains a classifying rotor or a classifying wheel with a clear height which increases with decreasing radius, so that when Operation is the flow-through surface of the classifying rotor or wheel at least approximately constant.
  • the air classifier contains a classifying rotor or a classifying wheel with a particularly exchangeable dip tube which is designed such that it rotates when the classifying rotor or the classifying wheel rotates.
  • a fine-material outlet chamber is provided, which has a cross-sectional widening in the flow direction.
  • the grinding gas has a pressure of ⁇ 4.5 bar (abs). This advantageously creates a process for the energy-optimized operation of a jet mill by means of compressed gases.
  • a preferred development is that the grinding gas is subjected to a jet milling of inorganic substances.
  • the method may preferably be further developed in that the temperature of the ground gas is> 100 ° C, wherein it is provided in particular that the temperature of the ground gas in the range of about 180 ° C to about 200 ° C.
  • the specific adiabatic energy consumption of a milling process using a Mahlgas horres of> 7 bar (abs) is first determined for which purpose suitable sensors and processor devices which are known to the person skilled in the art are used, so that their design need not be discussed further here.
  • a takeover of the thus obtained value of the specific adiabatic energy consumption takes place at a grinding gas pressure of> 7 bar (abs) in a memory.
  • the specific adiabatic energy consumption of the same milling process is determined using a milling gas pressure of ⁇ 4.5 bar (abs).
  • this value of the specific adiabatic energy consumption at a Mahlgas horrid of ⁇ 4.5 bar (abs) in a Memory read.
  • the two energy consumptions are compared, for example, by means of the already used for the determination of the energy consumption itself or other processor devices and is in the case e ad . spec 4 5 ⁇ e ad . spec 7
  • the corresponding operating mode can be set manually in accordance with the result of the comparison, which is visually indicated by suitable known devices, an automatic adjustment of the corresponding operating mode according to the result of the comparison is also possible if a suitable control exists and, on the one hand, determines the result of the comparison Processor means and on the other hand control means is connected, so that the control in response to the result of the comparison in accordance with the processor means causes the control means for setting the corresponding operating mode.
  • the method according to the invention is preferably carried out before each new operation of the jet mill, in particular with new ground material, and is thus part of the overall operating method of the jet mill.
  • the air classifier contains a classifying rotor or a classifying wheel with a clear height increasing with decreasing radius, so that the area of the classifying rotor or wheel through which flows is at least approximately constant during operation.
  • the air classifier contains a classifying rotor or a classifying wheel with a particularly exchangeable dip tube which is designed such that it rotates when the classifying rotor or the classifying wheel rotates.
  • a fine-material outlet chamber is provided, which has a cross-sectional widening in the flow direction.
  • FIG. 1 an embodiment of a jet mill 1 for carrying out the method explained above is shown schematically.
  • the method according to the invention can be carried out manually or automatically, which has no fundamental influence on the usefulness of the method.
  • the automated version of course allows a further reduction of the effort and is easy can be realized with means and means known to the person skilled in the art, which, however, is not intended to indicate that the person skilled in the art would also be aware of the individual steps of the method newly created by the present invention.
  • dealing with the sensor, measuring, processor, storage and control devices and control in general and in particular unnecessary, since this device implementation of the method according to the invention does not require its own inventive steps in the knowledge thereof.
  • the jet mill 1 contains a cylindrical housing 2, which encloses a grinding chamber 3, a Mahlgutholzgabe 4 approximately half the height of the grinding chamber 3, at least one Mahlstrahleinlass 5 in the lower region of the grinding chamber 3 and a product outlet 6 in the upper region of the grinding chamber 3.
  • the classifying wheel 8 can be a classifying wheel which is common in air classifiers and whose blades (see later eg in connection with FIG Fig. 3 ) define radially extending blade channels, at the outer ends of which the classifying air enters and entrains particles of smaller grain size or mass to the central outlet and to the product outlet 6, while larger particles or particles of larger mass are rejected under the influence of centrifugal force.
  • the air classifier 7 and / or at least its classifying wheel 8 with at least one design feature according to the EP 0 472 930 B1 fitted.
  • Mahlstrahleinlass 5 for example, consisting of a single, radially directed inlet opening or inlet nozzle 9 to impinge a single grinding jet 10 on the Mahlgutpiety that come from the Mahlgutiergabe 4 in the area of the grinding jet 10, with high energy and the To allow regrind particles to be broken down into smaller sub-particles, which are sucked in by the classifying wheel 8 and, insofar as they have a correspondingly small size or mass, are conveyed through the product outlet 6 to the outside.
  • the processing temperature can be influenced by using an internal heat source 11 between Mahlgutiergabe 4 and the range of grinding jets 10 or a corresponding heat source 12 in the area outside the Mahlgutiergabe 4 or by processing particles of already warm ground material, while avoiding heat loss in the Mahlgutiergabe 4 passes, to which a feed tube 13 is surrounded by a temperature-insulating jacket 14.
  • the heating source 11 or 12 may, when used, be basically arbitrary and therefore purposely operational and selected according to market availability, so that further explanation is not required.
  • the temperature of the grinding jet or the grinding jets 10 is relevant and the temperature of the material to be ground should at least approximately correspond to this grinding jet temperature.
  • a compressor can be used to provide appropriate operating medium B available.
  • a method for producing extremely fine particles is carried out with this jet mill 1 with an integrated dynamic air classifier 7.
  • a fluid is generally used, preferably the water vapor already mentioned, but also hydrogen gas or helium gas or simply air.
  • the classifying rotor 8 has a clear height which increases with decreasing the radius, that is to say towards its axis, wherein in particular the area of the classifying rotor 8 through which it flows is constant.
  • a fine-material outlet chamber (not shown) may be provided which has a cross-sectional widening in the flow direction.
  • a particularly preferred embodiment of the jet mill 1 is that the sifting rotor 8 has an exchangeable, co-rotating dip tube 20.
  • these are amorphous SiO 2 or other amorphous chemical products which are comminuted with the jet mill.
  • Other materials include silicic acids, silica gels or silicates or materials based on or containing carbon black.
  • the jet mill 1 contains, as the schematic representation in the Fig. 2 It can be seen, an integrated air classifier 7, which is for example in types of jet mill 1 as fluidized bed jet mill or as a dense bed jet mill to a dynamic air classifier 7, which is advantageously arranged in the center of the grinding chamber 3 of the jet mill 1. Depending on the grinding gas volume flow and classifier speed, the desired fineness of the material to be ground can be influenced.
  • the entire vertical air classifier 7 is enclosed by a classifier housing 21, which consists essentially of the upper housing part 22 and the lower housing part 23.
  • the upper housing part 22 and the lower housing part 23 are provided at the upper or lower edge, each with an outwardly directed peripheral flange 24 and 25 respectively.
  • the two peripheral flanges 24, 25 are in the installation or functional state of the air classifier 8 on each other and are fixed by suitable means against each other. Suitable means for fixing are, for example, screw connections (not shown). As releasable fastening means may also serve brackets (not shown) or the like.
  • both circumferential flanges 24 and 25 are connected to one another by a hinge 26 so that the upper housing part 22 can be pivoted upward in the direction of the arrow 27 after loosening the flange connecting means relative to the lower housing part 23 and the upper housing part 22 from below and the lower housing part 23 are accessible from above.
  • the lower housing part 23 in turn is formed in two parts and it consists essentially of the cylindrical withdrawraumgephaseuse 28 with the peripheral flange 25 at its upper open end and a discharge cone 29, which tapers conically downwards.
  • the discharge cone 29 and the reformraumgephasepuruse 28 are at the upper and lower ends with flanges 30, 31 on each other and the two flanges 30, 31 of discharge cone 29 and reformraumgephase 28 are like the peripheral flanges 24, 25 connected by releasable fastening means (not shown).
  • the thus assembled classifier housing 21 is suspended in or on support arms 28a, of which a plurality of evenly spaced around the circumference of the classifier or compressor housing 21 of the air classifier 7 of the jet mill 1 are distributed and attack the cylindrical withdrawraumgephase 28.
  • An essential part of the housing installations of the air classifier 7 is in turn the classifying wheel 8 with an upper cover plate 32, with an axially spaced lower downstream cover plate 33 and arranged between the outer edges of the two cover plates 32 and 33, fixedly connected to these and evenly around the circumference of Classifying wheel 8 distributed blades 34 with appropriate contour.
  • the drive of the classifying wheel 8 is effected via the upper cover disk 32, while the lower cover disk 33 is the downstream cover disk.
  • the storage of the classifying wheel 8 comprises a positively driven forcibly digestradwelle 35, which is led out with the upper end of the classifier housing 21 and rotatably supports the classifying wheel 8 with its lower end within the classifier housing 21 in flying storage.
  • the exit of the sortradwelle 35 from the classifier housing 21 takes place in a pair of machined plates 36, 37 which terminate the classifier housing 21 at the upper end of an upwardly frusto-conical housing end portion 38 guiding the classifying wheel shaft 35 and sealing this shaft passage without obstruction of the rotational movements of the classifying wheel shaft 35.
  • the upper plate 36 can be rotatably associated with the prepareradwelle 35 as a flange and rotatably supported via pivot bearings 35a on the lower plate 37, which in turn is associated with a housing end portion 38.
  • the underside of the downstream cover disk 33 lies in the common plane between the peripheral flanges 24 and 25, so that the classifying wheel 8 is arranged in its entirety within the hinged housing upper part 22.
  • the upper housing part 22 also has a tubular product feed nozzle 39 of the Mahlgutholzgabe 4, the longitudinal axis parallel to the axis of rotation 40 of the classifying wheel 8 and its drive or withdrawradwelle 35 and as far as possible from this axis of rotation 40 of the classifying wheel 8 and its Drive or prepareradwelle removed 35, the housing upper part 22 is disposed radially outboard.
  • the classifier housing 21 receives the coaxial with the classifying wheel 8 arranged tubular outlet nozzle 20 which lies with its upper end just below the downstream cover plate 33 of the classifying wheel 8, but without being connected thereto.
  • an outlet chamber 41 is attached coaxially, which is also tubular, but whose diameter is substantially greater than the diameter of the outlet nozzle 20 and in the present embodiment, at least twice as large as the diameter of the outlet nozzle 20.
  • the outlet nozzle 20 is inserted into an upper cover plate 42 of the outlet chamber 41. Below the outlet chamber 41 is closed by a removable cover 43.
  • outlet nozzle 20 and outlet chamber 41 is held in a plurality of support arms 44 which are evenly distributed star-shaped around the circumference of the unit, connected with their inner ends in the region of the outlet nozzle 20 fixed to the unit and secured with their outer ends on the classifier housing 21.
  • the outlet nozzle 20 is surrounded by a conical annular housing 45 whose lower, larger outer diameter corresponds at least approximately to the diameter of the outlet chamber 41 and its upper, smaller outer diameter at least approximately the diameter of the classifying wheel 8.
  • the support arms 44 terminate and are firmly connected to this wall, which in turn is part of the assembly of outlet nozzle 20 and outlet chamber 41.
  • the support arms 44 and the annular housing 45 are parts of a scavenging air device (not shown), wherein the scavenging air prevents the ingress of matter from the interior of the classifier housing 21 into the gap between the classifying wheel 8 or more precisely its lower cover disk 3 and the outlet nozzle 20.
  • the support arms 44 are formed as tubes, with their outer end portions passed through the wall of the classifier housing 21 and connected via a suction filter 46 to a purge air source (not shown) ,
  • the annular housing 45 is closed at the top by a perforated plate 47 and the gap itself can be adjusted by an axially adjustable annular disc in the area between the perforated plate 47 and the lower cover plate 33 of the classifying wheel 8.
  • the outlet from the outlet chamber 41 is formed by a fines discharge pipe 48, which is led into the separator housing 21 from the outside and is connected in a tangential arrangement to the outlet chamber 41.
  • the fine material discharge pipe 48 is part of the product outlet 6.
  • the lining of the junction of the fine material discharge pipe 48 with the outlet chamber 41 serves as a deflecting cone 49.
  • a sighting air inlet spiral 50 and a coarse material discharge 51 are assigned to the housing end section 38 in a horizontal arrangement.
  • the direction of rotation of the sighting air inlet spiral 50 is opposite to the direction of rotation of the classifying wheel 8.
  • the coarse material discharge 51 is detachably associated with the housing end portion 38, the lower end of the housing end portion 38 is a flange 52 and the upper end of Grobgutaustrages 51 assigned a flange 53 and both flanges 52 and 53 are in turn releasably connected together by known means when the air classifier 7 is ready is.
  • the dispersing zone to be designed is designated 54.
  • Flanges machined on the inner edge (chamfered) for a clean flow guidance and a simple lining are designated with 55.
  • a replaceable protective tube 56 is still applied to the inner wall of the outlet nozzle 20 as a wear part and a corresponding replaceable protective tube 57 may be applied to the inner wall of the outlet chamber 41.
  • view air is introduced into the air classifier 7 at a pressure gradient and at a suitably chosen entry speed via the sighting air inlet spiral 50.
  • the classifying air by means of a spiral, in particular in conjunction with the conicity of the housing end portion 38, the classifying air rises spirally upwards into the region of the classifying wheel 8.
  • the "product" of solid particles of different mass is introduced into the classifier housing 21 via the product feed port 39. From this product, the coarse material, ie the proportion of particles with a greater mass against the classifying air in the range of Grobgutaustrages 51 and is provided for further processing.
  • the fine material ie the particle fraction with a smaller mass is mixed with the classifying air, passes radially from outside to inside through the classifying wheel 8 into the outlet pipe 20, into the outlet chamber 41 and finally via a fine material outlet pipe 48 into a fine material outlet or outlet 58, as well as from there in a filter in which the resources in the form of a fluid, such as air, and fines are separated.
  • Coarser Feingut strongly promote are radially ejected from the classifying wheel 8 and mixed with the coarse material to leave the classifier, housing 21 with the coarse material or to circle so long in the classifier housing 21 until it has become fines of such grain, that it with the classifying air is discharged.
  • the air classifier 7 can again be well maintained by the division of the classifier housing 21 in the manner described and the assignment of the classifier components to the individual sub-housings and defective components can be replaced with relatively little effort and within short maintenance times.
  • This classifying wheel 8 according to the Fig. 3
  • the upper cover plate 32 and the axially spaced lower downstream cover plate 33 is rotatable about the axis of rotation 40 and thus the longitudinal axis of the air classifier 7.
  • the diametrical extent of the classifying wheel 8 is perpendicular to the axis of rotation 40, ie to the longitudinal axis of the air classifier 7, regardless of whether the axis of rotation 40 and thus said longitudinal axis is vertical or horizontal.
  • the lower downstream cover disk 33 concentrically encloses the outlet nozzle 20.
  • the blades 34 are connected to both cover disks 33 and 32.
  • the two cover plates 32 and 33 are deviating now deviating from the prior art conical and was preferably such that the distance between the upper cover plate 32 from the downstream cover plate 33 from the rim 59 of the blades 34 inward, ie towards the axis of rotation 40 back, and Although preferably continuous, such as linear or non-linear, and with further preference so that the surface of the flow-through cylinder jacket for each radius between blade outlet edges and outlet nozzle 20 remains constant. The decreasing due to the decreasing radius in known solutions outflow rate remains constant in this solution.
  • the shape of the non-parallel-sided cover disk may be such that at least approximately so that the surface of the cylinder jacket through which flows through remains constant for each radius between blade outlet edges and outlet nozzle 20.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
EP07722451A 2006-05-17 2007-05-18 Verfahren zur erzeugung feinster partikel mittels einer strahlmühle Active EP2024093B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006023193A DE102006023193A1 (de) 2006-05-17 2006-05-17 Verfahren zur Erzeugung feinster Partikel mittels einer Strahlmühle
PCT/DE2007/000903 WO2007131502A1 (de) 2006-05-17 2007-05-18 Verfahren zur erzeugung feinster partikel mittels einer strahlmühle

Publications (2)

Publication Number Publication Date
EP2024093A1 EP2024093A1 (de) 2009-02-18
EP2024093B1 true EP2024093B1 (de) 2011-05-11

Family

ID=38535276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07722451A Active EP2024093B1 (de) 2006-05-17 2007-05-18 Verfahren zur erzeugung feinster partikel mittels einer strahlmühle

Country Status (8)

Country Link
US (1) US8047458B2 (pt)
EP (1) EP2024093B1 (pt)
JP (1) JP5432707B2 (pt)
CN (1) CN101437621B (pt)
AT (1) ATE508798T1 (pt)
BR (1) BRPI0711645B1 (pt)
DE (1) DE102006023193A1 (pt)
WO (1) WO2007131502A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2754500A2 (de) 2013-01-14 2014-07-16 Nied, Roland, Dr.-Ing. Verfahren zur Strahlmahlung sowie Strahlmühle dafür

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017472A1 (de) * 2006-04-13 2007-10-18 Nied, Roland, Dr. Ing. Verfahren zur Erzeugung feinster Partikel mittels einer Strahlmühle
DE102006048864A1 (de) * 2006-10-16 2008-04-17 Roland Dr. Nied Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon
DE102006048865A1 (de) * 2006-10-16 2008-04-17 Roland Dr. Nied Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon
DE102009045116A1 (de) * 2009-09-29 2011-03-31 Evonik Degussa Gmbh Niederdruckvermahlungsverfahren
DE102011014643A1 (de) * 2011-03-21 2012-09-27 Roland Nied Betriebsverfahren für eine Strahlmühlenanlage und Strahlmühlenanlage
KR102224765B1 (ko) 2016-11-07 2021-03-08 와커 헤미 아게 실리콘 함유 고체를 분쇄하는 방법
DE102020006724A1 (de) * 2020-11-03 2022-05-05 Netzsch Trockenmahltechnik Gmbh Betriebsverfahren für einen Sichter und Sichter zur Klassifizierung

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2754500A2 (de) 2013-01-14 2014-07-16 Nied, Roland, Dr.-Ing. Verfahren zur Strahlmahlung sowie Strahlmühle dafür
DE102013000426A1 (de) 2013-01-14 2014-07-17 Roland Nied Verfahren zur Strahlmahlung sowie Strahlmühle dafür

Also Published As

Publication number Publication date
JP5432707B2 (ja) 2014-03-05
CN101437621A (zh) 2009-05-20
BRPI0711645B1 (pt) 2019-06-04
CN101437621B (zh) 2014-06-11
BRPI0711645A2 (pt) 2012-03-13
US20090294557A1 (en) 2009-12-03
JP2009537292A (ja) 2009-10-29
EP2024093A1 (de) 2009-02-18
DE102006023193A1 (de) 2007-11-22
ATE508798T1 (de) 2011-05-15
WO2007131502A1 (de) 2007-11-22
US8047458B2 (en) 2011-11-01

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