EP2125230A1 - Verfahren zum kontinuierlichen trocken-mahl-betrieb einer turm-reib-mühle und turm-reib-mühle - Google Patents
Verfahren zum kontinuierlichen trocken-mahl-betrieb einer turm-reib-mühle und turm-reib-mühleInfo
- Publication number
- EP2125230A1 EP2125230A1 EP08700982A EP08700982A EP2125230A1 EP 2125230 A1 EP2125230 A1 EP 2125230A1 EP 08700982 A EP08700982 A EP 08700982A EP 08700982 A EP08700982 A EP 08700982A EP 2125230 A1 EP2125230 A1 EP 2125230A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- gas
- outlet
- container
- packing
- 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.)
- Granted
Links
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
- 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
-
- 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
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- 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
- B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
- B02C17/188—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone characterised by point of gas entry or exit or by gas flow path
-
- 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
- B02C19/22—Crushing mills with screw-shaped crushing means
Definitions
- the invention relates to a method for continuous dry grinding operation of a tower friction mill according to the preamble of claim 1 and a tower friction mill according to the preamble of claim 13.
- a generic tower grinder mill is known from US-PS 4,754,934.
- the gas is introduced at the bottom of the grinding container and flows through the packing of grinding media and millbase.
- a centrifuge is mounted on the drive shaft, which is intended to eject the grinding material particles conveyed upwards from the gas flow and to feed them directly back into the grinding process by gravity.
- the gas stream introduced from below into the packing of grinding media to loosen up this packing and to discharge the grinding material particles at the top end of the mill, the gas must have a considerable pressure. Due to the mentioned loosening of the packing of grinding media and circulatory required regrind the grinding effect, ie the crushing performance is reduced.
- this package must be relatively open-pored, ie the size of the grinding media is limited down.
- the material to be ground must be relatively coarse. This in turn means that the interstices between the individual grinding bodies are filled only insufficiently with regrind.
- the energy consumption for the pressure blower is very high and is of the same order of magnitude as the energy consumption of the drive motor for the actual grinding process. From DE 42 02 101 Al a tower friction mill is known, in which the ground material is introduced from above into the grinding container and discharged in the region of the bottom through a sieve.
- a fluid for example in the form of air
- a fluid for example in the form of air
- a comparable tower friction mill is known from JP 2003 181 316 A.
- the sieve holes or sieve gaps in the bottom area can become clogged by worn or broken grinding media. This in turn leads to increased wear, which can eventually lead to damage of the lower ends of the screw flights.
- Another disadvantage is that well-flowing ground material, such as dry quartz sand, flows very quickly through the Mahlismepackung and thus is not subjected to a controlled grinding process.
- JP 2005 246 204 A it is known from JP 2005 246 204 A to remove the entire packing of grinding bodies together with the comminuted material to be ground from the grinding container via a screw conveyor arranged in the bottom area.
- the grinding media-millbase mixture outside the grinding container for example by sieving, are separated from each other.
- the grinding media must be returned together with the new regrind. This leads to a considerable expenditure on equipment.
- the invention has for its object to provide a method of the generic type and a tower grate mill of the generic type in which a continuous dry grinding operation while maintaining the packing of grinding media in the grinding container is possible and in which also the use of relatively small grinding media and a high fineness of the ground material to be ground is achieved.
- the packing of grinding media is dense during the entire grinding process, since it is not dissolved from below, for example by gas.
- the grinding bodies are conveyed upwards in the area covered by at least one screw land and accordingly flow downwards in the area not covered by the screw land, which is bounded externally by the grinding tank.
- the millbase is thus at least once fully funded by the grinding media package from top to bottom and once from bottom to top and thereby subjected to a grinding process.
- the media body packing Due to the conveying action of the worm web in the area of the drive shaft, the media body packing is raised in the interior of the grinding container and forms an approximately truncated cone-shaped, outwardly sloping surface, over which the grinding media roll outward. In this case, they press out the grinding stock on the surface or in the surface through the grinding stock outlet from the grinding container, whereby this is still supported to a considerable extent by the gas flow.
- 1 is a schematic representation of a tower friction mill with rotational flow of a gas stream
- FIG 2 a comparison with FIG 1 modified grinding container of a tower friction mill with supply of a gas stream diametrically to Mahlgut- outlet
- FIG. 3 shows a third embodiment of a grinding container of a tower friction mill with vertical supply of a gas stream
- Fig. 4 is a horizontal part-section through a sieve in the grinding stock outlet
- FIG. 5 is a plan view of the screen according to the viewing arrow V in Fig. 4th
- the tower friction mill shown in the drawing has a closed top, cylindrical grinding container 1, for whose inner diameter D applies: 0.4 m ⁇ D ⁇ 4.0 m.
- a screw conveyor 2 is arranged as MahlSystem- circulation device, which is arranged coaxially to the vertical center axis 3 of the grinding container 1.
- the Screw conveyor 2 has a coaxial with the central axis 3 arranged drive shaft 4 with a diameter di on which two mutually parallel screw webs 5 with a slope s and an outer diameter da and an upper end 6 are attached.
- the shaft 4 is rotationally driven by means of an electric motor 7 in a rotational direction 8.
- the screw conveyor 4 extends down to the immediate vicinity of the bottom 9 of the grinding container 1.
- the screw-webs 5 extend from this neighborhood to the bottom 9 over a height hs.
- the tower grinder mill is very slim. For the ratio of the screw height hs to the diameter D of the grinding container 1: 1.5 ⁇ hs / D ⁇ 3.
- Mahlgut- outlet 1 1 is formed on the grinding container 1, to which a Mahlgut- discharge line 12 connects.
- a grinding media retention device is arranged in the form of a gap-sieve 14, which is shown in Figs. 4 and 5. It has between approximately parallel to the central axis 3 extending webs 15 column 16, which - as shown in Fig. 4 can be seen - radially expand to the axis 3 to the outside and continue to expand from bottom to top, as shown in FIG. 5 can be seen. At least in the lower region, its width w is smaller than the diameter dl 7 of the smallest grinding media 17 used.
- the outlet opening 13 has a height hl 3.
- the worm webs 5 extend from 0, 1 h 13 to 0.5 h 13 over the lower edge 18 of the outlet opening 13, that is, its upper end 6 is at this level above the Bottom edge 18.
- the cross-sectional area swept by the screw lands 5 is (da 2 - di 2 ) x ⁇ / 4.
- the free annular cross-sectional area between the screw webs 5 and the grinding container is (D 2 - da 2 ) x ⁇ / 4.
- the free cross-sectional area between the worm webs 5 and the grinding container 1 should be greater than or at most equal to the swept by the worm webs 5 annular cross-section. The following applies: (D 2 - da 2 )> (since 2 - di 2 ).
- a grinding stock inlet 19 opens into the grinding container 1 diametrically opposite the grinding stock outlet 11. It is arranged above the upper end 6 of the screw webs 5, specifically starting above the upper edge 20 of the outlet opening 13.
- the millbase inlet 19 is preceded by a mill feed line 21, into which the millbase 22 is gas-tight Dosing device 23, for example, a rotary valve, is supplied.
- a gas inlet 24 open to the atmosphere in this case an air inlet, is provided.
- the Mahlgut- discharge line 12 is connected to a suction fan 25, with the interposition of a wind sifter 26, for example, a conventional cyclone separator, and this nachgeordne- th dust filter separator 27.
- a wind sifter 26 for example, a conventional cyclone separator, and this nachgeordne- th dust filter separator 27.
- a filter 28 is provided in the separator 27th . It is connected to the bottom of a gas-tight lock 29, such as a rotary valve.
- From the wind sifter 26 is coarse material to be ground via a return line 30 of the metering device 23 and thus fed to the grinding stock inlet 19 again.
- the millbase discharged from the separator 27 has the desired fineness.
- a pressure transducer 31 is arranged in the grinding container 1.
- a further pressure transducer 32 is arranged in the regrind discharge line 12 relatively close behind the Mahlgut- outlet 11. Their pressure readings are applied to a differential pressure gauge 33 for determining the pressure difference between the two measured values.
- a gas volume meter 34 is disposed between the separator 27 and the blower 25.
- an additional gas line 35 which can be opened or closed via a controllable valve 36. About this additional gas can be introduced into the line 12, when the gas volume flow coming from the grinding container 1 is not sufficient to request the material to be ground.
- a gas flow meter 37 is inserted in this line 35.
- the grinding container 1 Before commissioning the grinding container 1 is filled with grinding media 17, up to a height which is 80% to 95% of the height of the grinding container 1 to the upper end 6 of the screw webs 5 to just above the lower edge 18 of the outlet opening thirteenth is. Subsequently, the motor 7 is set in operation, so that the shaft 4 is set with the worm webs 5 in the direction of rotation 8 in operation. Corresponding to the pitch of the worm webs 5, the grinding bodies 17 which are located in the annular cross-sectional area of the grinding container 1 swept by the worm webs 5 are conveyed upwards.
- the helix webs 5 in the ratio to the outer diameter of the screw flights 5 0.5 da ⁇ s ⁇ 1.5 da and preferably 0.8 da ⁇ s ⁇ 1.2 da. Furthermore, the shaft 4 is driven with the worm webs 5 at such a speed that the worm webs 5 an outer peripheral speed of 2.0 to 4.0 m / sec and preferably between 2.2 and 3.0 m / sec.
- the diameter dl7 of the grinding media 17 the following applies: 10 mm ⁇ dl7 ⁇ 30 mm and preferably 15 mm ⁇ dl 7 ⁇ 25 mm.
- the supplied grinding material 22 generally has a particle size which is smaller than 0.25 dl 7 of the diameter dl 7 of the grinding media 17 and preferably less than 0.2 dl7. Since the grinding bodies 17 are conveyed upwards in the area of the screw webs 5, they sink downwards in the outer region not swept by the screw webs 5, as indicated by the circulation flow arrows 38 in FIG. The millbase fed in the area of the container wall flows downwards with the grinding bodies 17 and is crushed between them. Subsequently, with further comminution with the grinding bodies 17, it is again conveyed upwards in the area of the screw webs 5.
- the grinding bodies 17 are only slightly, to 0.3 hl 3, above the lower edge 18 of the outlet opening 13 and the sieve 14.
- regrind 22 which swells radially outward from the packing of grinding media 17, directly in front of the sieve 14.
- air is sucked in from the outside through the gas inlet 24 by the blower 25 and flows around the shaft 4 in accordance with the deflection arrow 40 and over the surface 39 of the grinding-body packing.
- the gas inlet 24 is predominantly orthogonal, ie substantially directed to the axis 3, then only a simple deflection by 180 ° of the air around the shaft 4. If, however, the gas inlet 24 is arranged predominantly tangentially, then formed a rotational flow out.
- the conveyed according to the deflection arrow 40 through the grinding container 1 air takes very fine ground material 22, which is fed through the Mahlgut inlet 19, directly with and carries it directly.
- the gas stream enters the regrind discharge line 12 through the sieve 14.
- the described gas flow in this case pushes the grinding material 22 located in the grinding container 1 in front of the sieve 14 into the line 12. As far as grinding bodies 17 reach the sieve 14, they are retained by this.
- the entire material to be ground 22 is discharged after a described circulation.
- the coarse, not sufficiently comminuted material to be ground 22 is deposited and fed through the return line 30 and the metering device 23 again the grinding process.
- the conveying air enters the dust filter separator 27 together with the finely ground milling material 22, where the finely ground material
- Ground material is deposited on the filter 28 and discharged through the lock 29.
- the freed from the material to be ground 22 air is discharged through the blower 25.
- Outlet 1 1 conveyed air is not sufficient to perform the described discharge process, then can be additionally added to the air supply via the additional gas line 35 of the conveying air.
- the design of the actual tower friction mill of FIG. 2 differs from that of FIG. 1 by the arrangement of the gas inlet 24 '. This is located opposite the Mahlgut- outlet 1 1 above the Mahlgut-inlet 19. The air flow flows around here in accordance with the flow arrow 41, the shaft 4 and then - as in the embodiment of FIG. 1 on the surface 39 of the grinding stock MahlSystem-packing and presses the ground material 22 through the sieve 14 in the Mahlgut- discharge line 12.
- the gas inlet 24 'in the direction of the shaft 4 into the grinding container 1 hineinver helps so that the entering through the Mahlgut inlet 19 Mahlgut 22 can flow directly to the inner wall of the grinding container 1 down in the Mahl stresses- packing.
- FIG. 3 differs from the two previously illustrated in that the gas flow is not sucked by means of a suction fan. Rather, a pressure blower 42 is provided, which pushes gas with an arbitrary predeterminable pressure through a gas inlet 24 "from above into the grinding container 1. The gas flows according to the flow arrow 43 from above through the grinding container 1 and then over the Surface 39 to the grinding stock outlet 1 1 and presses in the manner already described, the material to be ground 22 through the sieve 14th
- a delivery pressure of less than 1 bar can be achieved due to the use of a suction fan 25
- a pressure which is in principle arbitrary can be set by using a pressure fan 42.
- the Mahlgut inlet 19 is covered by a guide plate 44 so that the Mahlgut- entry is not affected by the gas flow.
- a baffle 44 can be used to cover the grinding stock inlet 19 in the embodiments of FIGS. 1 and 2 as needed.
- the MahlSystem- outlet 10 ' is provided in the bottom 9 of the grinding container 1, whereby the removal of the grinding media 17 can be facilitated from the grinding container 1.
- a difference-pressure measurement is made via the measuring device 33 and the corresponding measured value is passed to a central control unit 45. If the measured differential pressure exceeds a predetermined setpoint, this may be an indication that the screen 14 is partially or completely clogged.
- the fan unit 25 or the blower 42 can be controlled by the control unit 45 in order to increase and / or the main gas volume flow, which is supplied via the gas inlet 24, 24 'or 24 " The aim is to suck more gas through the sieve 14 in such a case or push it through.
- a main gas volume flow is set via the measuring device 34 for a given predetermined operation, which are promoted by the fan 25 and 42, respectively should.
- the secondary gas volume flow to be supplied via the additional gas line 35 is adjusted so that a predetermined desired gas volume flow is conveyed through the grinding container 1. This nominal gas volume flow conveyed through the grinding container 1 results from the difference between the main gas volume flow and the secondary gas flow rate.
- volume flow If the gas volume flows are constantly measured via the measuring devices 34 and 37, it follows from an increase in the volume flow detected by the measuring device 37 that the screen 14 is partially or completely blocked. In such a case, the total gas volume flow to be delivered by the fan 25 or 42 is increased. At the same time, the valve 36 is partially or completely closed, to achieve in this way a higher gas flow rate through the grinding container 1, and thus to blow the screen 14. Cumulatively, the already described differential pressure measurement can also be used.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL08700982T PL2125230T3 (pl) | 2007-02-02 | 2008-01-04 | Sposób mielenia na sucho w ruchu ciągłym w wieżowym młynie rozcierającym oraz wieżowy młyn rozcierający |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007005250A DE102007005250B3 (de) | 2007-02-02 | 2007-02-02 | Verfahren zum kontinuierlichen Trockenmahlbetrieb einer Turmreibmühle und Turmreibmühle |
PCT/EP2008/000030 WO2008092542A1 (de) | 2007-02-02 | 2008-01-04 | Verfahren zum kontinuierlichen trocken-mahl-betrieb einer turm-reib-mühle und turm-reib-mühle |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2125230A1 true EP2125230A1 (de) | 2009-12-02 |
EP2125230B1 EP2125230B1 (de) | 2013-06-05 |
EP2125230B8 EP2125230B8 (de) | 2013-07-17 |
Family
ID=38825521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08700982.5A Not-in-force EP2125230B8 (de) | 2007-02-02 | 2008-01-04 | Verfahren zum kontinuierlichen trocken-mahl-betrieb einer turm-reib-mühle und turm-reib-mühle |
Country Status (17)
Country | Link |
---|---|
US (2) | US7971808B2 (de) |
EP (1) | EP2125230B8 (de) |
JP (1) | JP5358457B2 (de) |
KR (1) | KR101381488B1 (de) |
CN (1) | CN101600504B (de) |
AU (1) | AU2008210059B2 (de) |
BR (1) | BRPI0806627A2 (de) |
CA (1) | CA2677268C (de) |
DE (1) | DE102007005250B3 (de) |
DK (1) | DK2125230T3 (de) |
ES (1) | ES2424021T3 (de) |
MX (1) | MX2009007307A (de) |
PL (1) | PL2125230T3 (de) |
RU (1) | RU2453372C2 (de) |
UA (1) | UA97510C2 (de) |
WO (1) | WO2008092542A1 (de) |
ZA (1) | ZA200905382B (de) |
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DE102007005250B3 (de) * | 2007-02-02 | 2008-01-17 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Verfahren zum kontinuierlichen Trockenmahlbetrieb einer Turmreibmühle und Turmreibmühle |
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WO2013167851A1 (en) * | 2012-05-10 | 2013-11-14 | Belmonte Investments Limited | Attritor mill and process for using it |
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CN102728440B (zh) * | 2012-07-11 | 2014-04-16 | 北京萃宝重工科技有限公司 | 高效立式球磨机 |
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EP2837424A1 (de) * | 2013-08-13 | 2015-02-18 | TARTECH eco industries AG | Schlackenbrecher |
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DE102007005250B3 (de) * | 2007-02-02 | 2008-01-17 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Verfahren zum kontinuierlichen Trockenmahlbetrieb einer Turmreibmühle und Turmreibmühle |
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2007
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- 2008-01-04 BR BRPI0806627-2A patent/BRPI0806627A2/pt not_active IP Right Cessation
- 2008-01-04 CN CN2008800039451A patent/CN101600504B/zh not_active Expired - Fee Related
- 2008-01-04 EP EP08700982.5A patent/EP2125230B8/de not_active Not-in-force
- 2008-01-04 KR KR1020097017508A patent/KR101381488B1/ko not_active IP Right Cessation
- 2008-01-04 ES ES08700982T patent/ES2424021T3/es active Active
- 2008-01-04 PL PL08700982T patent/PL2125230T3/pl unknown
- 2008-01-04 UA UAA200908175A patent/UA97510C2/ru unknown
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Non-Patent Citations (1)
Title |
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See references of WO2008092542A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2424021T3 (es) | 2013-09-26 |
WO2008092542A1 (de) | 2008-08-07 |
MX2009007307A (es) | 2009-08-07 |
UA97510C2 (ru) | 2012-02-27 |
EP2125230B1 (de) | 2013-06-05 |
KR101381488B1 (ko) | 2014-04-04 |
DE102007005250B3 (de) | 2008-01-17 |
JP2010517739A (ja) | 2010-05-27 |
US20110240774A1 (en) | 2011-10-06 |
EP2125230B8 (de) | 2013-07-17 |
PL2125230T3 (pl) | 2013-11-29 |
AU2008210059A1 (en) | 2008-08-07 |
JP5358457B2 (ja) | 2013-12-04 |
ZA200905382B (en) | 2010-10-27 |
RU2453372C2 (ru) | 2012-06-20 |
US7971808B2 (en) | 2011-07-05 |
RU2009128952A (ru) | 2011-03-10 |
CN101600504A (zh) | 2009-12-09 |
BRPI0806627A2 (pt) | 2011-09-13 |
KR20090115160A (ko) | 2009-11-04 |
CA2677268A1 (en) | 2008-08-07 |
US20100102151A1 (en) | 2010-04-29 |
DK2125230T3 (da) | 2013-09-08 |
US8141801B2 (en) | 2012-03-27 |
AU2008210059B2 (en) | 2011-08-11 |
CA2677268C (en) | 2014-07-08 |
CN101600504B (zh) | 2011-06-15 |
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