EP0904153A1 - Nassmahlverfahren und mühle zur durchführung des verfahrens - Google Patents

Nassmahlverfahren und mühle zur durchführung des verfahrens

Info

Publication number
EP0904153A1
EP0904153A1 EP97918238A EP97918238A EP0904153A1 EP 0904153 A1 EP0904153 A1 EP 0904153A1 EP 97918238 A EP97918238 A EP 97918238A EP 97918238 A EP97918238 A EP 97918238A EP 0904153 A1 EP0904153 A1 EP 0904153A1
Authority
EP
European Patent Office
Prior art keywords
materials
track
roller
crusher according
drum
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
Application number
EP97918238A
Other languages
English (en)
French (fr)
Other versions
EP0904153B1 (de
Inventor
Renaud Evrard
Alain Cordonnier
Bernard Gaucherand
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.)
FCB Ciment
Original Assignee
F C B
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 F C B filed Critical F C B
Publication of EP0904153A1 publication Critical patent/EP0904153A1/de
Application granted granted Critical
Publication of EP0904153B1 publication Critical patent/EP0904153B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • B02C23/18—Adding fluid, other than for crushing or disintegrating 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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/06—Mills with rollers forced against the interior of a rotary ring, e.g. under spring action

Definitions

  • the present invention relates to wet grinding and grinders comprising at least one roller or roller rolling on a circular track and pressed elastically thereon. .
  • Known mills of the type defined above, vertical mill or ring mill, in which a multigranular layer of the materials to be ground is compressed between the roller or the roller and the track with sufficient pressure to crush the grains and cause their fragmentation in smaller grains, are not suitable for wet grinding because too high a water content of the materials to be ground decreases their efficiency.
  • the materials to be ground In the wet process, the materials to be ground generally have a water content of 10% to 60% by weight, with an average of 30%, which is incompatible with good grinding yield.
  • the object of the present invention is to allow the rational use of mills of this type for wet grinding.
  • the process which is the subject of the present invention consists in subjecting the materials to be ground to several grindings by crushing in a layer or bed of materials and, during their stay in the grinding apparatus and between two successive grindings, in adding water or a other liquid to the materials to re-expand the layer of materials and make it possible to control the progress of the materials in the grinding apparatus and possibly to ensure their particle size classification, then to drain and / or spin the materials so as to reduce their content water at less than 20% by volume.
  • the draining and spinning operations are carried out inside the grinding apparatus, which is arranged for this purpose, which makes it possible to significantly reduce the cost of the installation by avoiding the use of auxiliary apparatuses. and means of transport between the different devices.
  • a mill comprising a circular track, fictitiously divided into several elementary tracks, or several circular tracks spaced apart from each other, where the successive grinding operations, means for transferring the materials from one track or track element to the next, means for projecting water or another liquid onto the materials during their transfer from one track or track element to the next, and means capable of drain and / or spin the materials before their next passage under the roller or roller.
  • the tracks will be arranged side by side.
  • Adding water or another liquid to the materials after each grinding operation makes it possible, on the one hand, to improve the flow of the materials and their distribution in a layer of uniform thickness on the track and, d On the other hand, to eliminate fine particles immediately after their production which makes subsequent grinding operations more efficient.
  • Water or any other liquid can be sprayed onto the materials when they are still on the track, for example by means of nozzles supplied under pressure which then constitute one of the means for transferring the materials from a track or track element to the next.
  • the mill when the mill is of the rotary ring type and is rotated at a speed greater than the critical speed so that the centrifugal force is sufficient to maintain a layer of material over the entire periphery of the track arranged on the ring, it will be possible to use nozzles placed inside the ring, in its upper part and on the ascending side, and the jets of which will be directed towards the track to detach the materials; the action of the jets can be supplemented by that of a scraper. Spinning can be carried out by the action of centrifugal force in the part of the track located upstream of the roller or grinding roller.
  • a precompression roller or roller may be provided on the track, immediately in front of the grinding roller or roller, to ensure additional spinning by pressure.
  • the crusher is of the rotary ring type and the material advancement device comprises one or more deflector plates arranged so as to intercept the materials detached from the track fitted inside the ring and oriented so as to deflect them in a direction having a component parallel to the axis of the ring; additional means for spraying water may be provided above the deflector plate or plates to facilitate the flow of the materials.
  • the deflector plate (s) may be porous and water or another liquid may be injected through the plate to create a liquid film facilitating the flow of materials.
  • the deflector plate or plates may include a screening upper surface and means for collecting and discharging the water and the fine ground products passing through this surface; they then constitute a means of draining coarse materials. They can be flat or curved and each plate will be orientable around a vertical axis and possibly tiltable around a horizontal axis so as to be able to adjust the speed of advance of the materials to be ground and choose the point where the materials deflected by the plate fall back on the track.
  • the wringing of the materials is carried out, under the action of centrifugal force, in the area of the track located between the point where the materials deflected by the deflector plate (s) fall on the track and the roller or the roller.
  • this zone will have an angular extent of at least 30 °.
  • drainage means can be provided in these areas to facilitate the evacuation of water.
  • the track consists of armor plates resting on the drum shell, which is generally the case, drainage means may be provided under the plates, in the grinding zone. You can also use a grooved roller or roller.
  • the drum will be provided with annular flanges forming a dam and the internal diameter of which will be chosen to retain the material in the supply and evacuation zones, respectively, while possibly allowing the evacuation of the water by overflow.
  • edges may be designed so that it is possible to modify the inside diameter to adjust their height (radial dimension).
  • the materials retained by these edges form, at least at the level of the grinding zone, an embankment which prevents the materials compressed between the roller or the roller and the track from being expelled laterally by pressure while allowing the evacuation of the water partly through said slope, if the supply area, respectively discharge, is provided with drainage means, and partly by overflow above the slope.
  • a rotary screen with a horizontal axis, can be placed at the outlet of the mill to sort the ground products. Rejections from the rotary screen may be brought back to the track or to the entrance to the mill by an internal recycling device comprising a conduit disposed inside the mill, transverse to the track, means for supplying said conduit with the refusals of the screen and possibly means to facilitate the flow of refusals in the conduit.
  • the screen may be integral with the body of the crusher or supported and driven by individual means.
  • Means for injecting water may be provided in the rotary screen to facilitate the evacuation of the crushed products and possibly reconstitute therewith a pulp having the composition suitable for further processing
  • the mill comprises two tracks axially spaced from each other inside a drum with a horizontal axis, two rollers or rollers each capable of rolling on a track, means for bringing the materials to grind in the drum, between the two tracks, and means for discharging the ground material at the two ends of the drum
  • the mill comprises several tracks axially spaced from each other inside a drum with a horizontal axis, several rollers or rollers capable of each rolling on a track, means for introducing the materials to grind in the drum at one of its ends, means for transferring the materials from one track to the next and means for evacuating the ground materials at the other end of the drum, drainage means for evacuating the water being provided between the tracks
  • FIG. 1 is a schematic representation, in cross section, of a crusher produced according to the invention
  • Figure 2 is a section along A- A 'of the crusher of Figure 1, the roller and the interior equipment of the crusher being shown in elevation
  • Figure 3 is a view similar to Figure 1 of a variant
  • FIGS. 1 and 2 are views similar to Figure 2 of another variant.
  • the crusher shown in FIGS. 1 and 2 is a grinder of the ring type constituted by a drum 2 with a horizontal axis supported by one or more pairs of pads 6 allowing its rotation around its axis
  • the drum is rotated in the direction of the arrow R by conventional means not shown. It consists of a ferrule, the middle part of which is internally coated with wear plates and forms a ring carrying the grinding track
  • a roller 4 is placed inside the shell so as to roll on the track 18 when the drum is driven in rotation.
  • the roller is integral with a shaft parallel to the axis of the drum and the ends of which, which are outside the drum, are mounted in bearings capable of moving in slides or supported by pivoting arms; springs or jacks act on the bearings so as to press the roller on the track with a predetermined and adjustable force
  • This assembly is conventional and the shaft and the bearings have not been shown in the drawings so as not to obscure them.
  • the roller can be free or rotated by a gear motor
  • the surface of the track and the peripheral surface of the roller are cylindrical but they could be frustoconical or cylindrical-conical, or formed from several parts having different diameters, as described, by example, in patent n ° 91 09788 in the name of the applicant.
  • the materials to be ground are introduced into the drum by a chute 20 arranged at one end of the drum, at the other end, where the ground materials are removed, the shell is extended by a cylindrical screen 14 which is surrounded by a collector 15.
  • Nozzles 24 placed inside the screen 14 make it possible to water the crushed materials to improve the screening and possibly produce a pulp of composition suitable for further treatment.
  • This chute is fed at one of its ends, for example by a scraper device. from the inner surface of the screen, water injection means may be provided to facilitate the flow of refusals in the chute
  • the crusher is equipped with a step-by-step feed device consisting of water injection nozzles 12 and a screen 8
  • the nozzles 12, mounted on a supply pipe not shown, are arranged so that their jets are directed towards the surface of the track to detach the layer of materials therefrom.
  • the action of the nozzles could possibly be assisted by a scraper, parallel to the axis of the drum and arranged near the surface of the track, as described in patent n ° 91 09788 in the name of the applicant, preferably the edge of the scraper will not be in contact with the surface of the track , but at a short distance from it, to reduce wear
  • the screen 8 consists of a flat or curved grid and a collecting tank II is mounted on a support 26 so as to be able to pivot around a vertical axis or inclined 28 thanks to a rod-jack system not shown II can optionally be mounted so as to be able to pivot around a horizontal axis so that it is possible to modify its inclination
  • a chute 17 makes it possible to bring the screen 14 into the water and fine crushed material collected in the screen collector 8
  • Means may be provided to
  • the interior of the mill can be divided into five well-defined zones: a grinding zone BC, a lifting zone CD, a scraping zone DE, a feed and drainage zone EF and a zone d 'spinning FB
  • a grinding zone BC a grinding zone BC
  • a lifting zone CD a scraping zone DE
  • a feed and drainage zone EF a feed and drainage zone EF
  • a zone d 'spinning FB In longitudinal section, the interior of the mill can be divided into three zones: a feeding zone 30, a crushing zone 31 and a discharge zone 32
  • the interior coating of the feeding and / or drainage can be designed to allow drainage of water by drainage
  • the materials to be ground are introduced through the chute 20 into the feed zone 30 of the drum and a layer of materials is formed in this zone, the progression of which is parallel to the axis and is controlled by the advance device Un rim 21 of the drum 2 whose internal diameter is substantially equal to that of the layer of materials on the track constitutes a barrier allowing the formation of this layer
  • Un rim 21 of the drum 2 whose internal diameter is substantially equal to that of the layer of materials on the track constitutes a barrier allowing the formation of this layer
  • the speed of rotation of the drum is greater than the critical speed, so that the layer of materials is retained on the wall of the drum by centrifugal force, over its entire periphery Part of the water contained in the materials is possibly evacuated in this zone by drainage
  • an elementary volume of the layer of materials on the track for example at the upstream end of the grinding zone BC, it is first subjected to a compression crushing between the roller 4 and the track 18 then, while remaining pressed on the track by centrifugal force, it is raised up to the scraping zone where it is detached from the track and disintegrated by the jets of water emitted by the nozzles 12.
  • the grains of material which constitute this elementary volume then fall on the screen 8 where the water and the sufficiently fine grains cross the screening surface, are collected by the collector and brought to the rotary screen 14 by the chute 17 , while the larger grains slide along the screen.
  • the orientation and the inclination of the screen are such that the downward movement of the materials on the screen is accompanied by a movement parallel to the axis of the drum and the length of which is equal to a fraction of the width of the track. Adjusting the orientation of the screen makes it possible to control the advance of the materials to force them to undergo several grinding cycles before being removed from the mill.
  • the action of the screen as part of the step-by-step feed device can be compared to that of the deflector plates in the crusher object of patent 91 09788 cited above.
  • the drained materials fall from the screen on the track where they reconstitute a layer which is wrung, under the action of centrifugal force, in the zone FB, between their point of fall and the zone of grinding BC.
  • the angular extent of the FB zone must be at least 30 °; the relative positions of the roller 4 and the screen 8 will be chosen to satisfy this condition
  • the centrifugal force also produces in the spinning zone a particle size classification of the solid particles which improves the work of the crusher.
  • the drum On the outlet side, the drum is provided with a rim 23 whose internal diameter is approximately equal to that of the layer of materials.
  • This rim allows the formation, in the discharge zone 32, of a slope of materials which prevents an excessive quantity of materials being entrained by the water when the fluidity of the layer of materials being on the track is too high, and which opposes the expulsion of the materials under the action of the pressure of the roller in the grinding zone.
  • the flanges 21 and 23 may be designed so that their internal diameter can be modified to adapt it to the nature and / or the behavior of the ground materials; they may, for example, be formed of exchangeable rings or segments.
  • a precompression roller 5 can be placed on the track just before the grinding zone to complete the dewatering of the layer of materials and to prevent the water discharged by dewatering above the layer of material does not reach the grinding roller.
  • Known means will be used to adjust the pressure exerted by the roller 5 on the layer of materials.
  • Arrangements can be made to facilitate the evacuation of the water in the grinding zone: grooving of the roller, arrangement of drainage means under the armor plates of the track, etc.
  • the screen 14 could be supported and driven independently. It could, for example, rotate at a speed lower than the critical speed and be equipped with lifters or scoops allowing the recycling chute 16 to be supplied with rejects.
  • the mill could include several tracks spaced axially from one another along the drum, drainage and / or wringing means being provided between the tracks.
  • the mill shown in Figure 4 has two tracks 18 'and 18 "arranged on either side of the median plane of the drum and axially spaced from one another, and two rollers 4' and 4" each rolling on a track.
  • the materials to be ground are brought by a chute or any other feeding means not shown in the space between the two tracks where they form, under the action of centrifugal force, a layer which is brought on the two tracks by advance devices.
  • Each track is equipped with a step-by-step feed device, for example of the same type as that of the grinder in FIGS. 1 and 2, which ensures the movement of materials from the medium to each end of the drum. These devices have not been shown in FIG. 4.
  • the drum shell is extended at each of its ends by a cylindrical screen 14 ', 14 "equipped with water injection nozzles 24', 24".
  • Collectors 15 ', 15 “collect the water and the fine grains having passed through the screens and two recycling devices 16', 16” make it possible to return the refusals of the screens to the central zone of the drum.
  • Each half of the crusher in Figure 4 works like the crusher in Figures 1 and 2. For the same production capacity, this construction makes it possible to halve the width of the track, which facilitates the evacuation of the water in the spin zone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
EP97918238A 1996-04-23 1997-04-15 Nassmahlverfahren und mühle zur durchführung des verfahrens Expired - Lifetime EP0904153B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9605074A FR2747598B1 (fr) 1996-04-23 1996-04-23 Procede de broyage en voie humide et broyeur pour la mise en oeuvre de ce procede
FR9605074 1996-04-23
PCT/FR1997/000681 WO1997039829A1 (fr) 1996-04-23 1997-04-15 Procede de broyage en voie humide et broyeur pour la mise en oeuvre de ce procede

Publications (2)

Publication Number Publication Date
EP0904153A1 true EP0904153A1 (de) 1999-03-31
EP0904153B1 EP0904153B1 (de) 2001-07-11

Family

ID=9491481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918238A Expired - Lifetime EP0904153B1 (de) 1996-04-23 1997-04-15 Nassmahlverfahren und mühle zur durchführung des verfahrens

Country Status (14)

Country Link
US (1) US6179233B1 (de)
EP (1) EP0904153B1 (de)
AU (1) AU728448B2 (de)
BR (1) BR9708808A (de)
CA (1) CA2251006C (de)
DE (1) DE69705615T2 (de)
DK (1) DK0904153T3 (de)
FR (1) FR2747598B1 (de)
ID (1) ID16617A (de)
MA (1) MA24149A1 (de)
NO (1) NO984930L (de)
RU (1) RU2176551C2 (de)
WO (1) WO1997039829A1 (de)
ZA (1) ZA973443B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2135234T3 (es) * 1995-07-04 1999-10-16 Smidth & Co As F L Molino de rodillo anular.
US9010670B2 (en) * 2009-11-25 2015-04-21 Fives Solios S.A. Method and machine for manufacturing paste, in particular carbon paste for making aluminum production electrodes
FR2983418B1 (fr) * 2011-12-02 2013-11-22 Fives Fcb Broyeur par compression de lit de matieres
RU2497594C1 (ru) * 2012-06-08 2013-11-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" Горизонтальная валковая мельница
MX2015017676A (es) * 2013-07-22 2016-06-21 Imp Technologies Pty Ltd Trituradora ajustable super-fina.
CN103521775B (zh) * 2013-10-08 2016-04-13 镇江宝纳电磁新材料有限公司 鳞片状金属粉末带肋的碾压装置
FR3026967B1 (fr) * 2014-10-10 2016-10-28 Fives Fcb Broyeur par compression de lit de matieres
US11097282B2 (en) * 2018-06-22 2021-08-24 1167586 B.C. Ltd. Apparatus, method and system for wet or dry processing of plant material
EP3843901A4 (de) * 2018-08-28 2022-06-15 Canada Mining Innovation Council Monowalzenmühle

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1603639A (en) * 1921-12-01 1926-10-19 James G Berryhill Pulverizing apparatus
US1577376A (en) * 1925-11-21 1926-03-16 Silva Frank Mill
FR1444397A (fr) * 1965-07-15 1966-07-01 Broyeur et procédé de broyage
SE421752B (sv) * 1978-05-02 1982-02-01 Broman John S Forfarande och kvarn for klasserande-separerande vatmalning av bergarter o dylikt
GB2118457B (en) * 1982-04-13 1985-05-22 Smidth & Co As F L Edge runner mills
JPH074543B2 (ja) * 1990-01-12 1995-01-25 宇部興産株式会社 竪型粉砕機
FR2679792B1 (fr) * 1991-08-01 1995-08-25 Fcb Perfectionnements aux broyeurs a anneaux.
ES2087267T5 (es) * 1990-11-12 2001-12-16 Fcb Ciment Molino para el molido fino de materiales.
EP0750692B1 (de) * 1994-03-16 2001-05-23 E.I. Du Pont De Nemours And Company Verfahren und vorrichtung zur herstellung gleichmässig abwechselnden kablierten zwirns und produkt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9739829A1 *

Also Published As

Publication number Publication date
MA24149A1 (fr) 1997-12-31
WO1997039829A1 (fr) 1997-10-30
AU728448B2 (en) 2001-01-11
RU2176551C2 (ru) 2001-12-10
BR9708808A (pt) 1999-08-03
NO984930L (no) 1998-12-17
ZA973443B (en) 1997-10-24
NO984930D0 (no) 1998-10-22
US6179233B1 (en) 2001-01-30
CA2251006C (fr) 2003-07-01
FR2747598B1 (fr) 1998-06-19
DK0904153T3 (da) 2001-10-22
ID16617A (id) 1997-10-23
FR2747598A1 (fr) 1997-10-24
CA2251006A1 (fr) 1997-10-30
DE69705615T2 (de) 2002-05-16
AU2643897A (en) 1997-11-12
EP0904153B1 (de) 2001-07-11
DE69705615D1 (de) 2001-08-16

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