EP0489633A1 - Verfahren zur Zerkleinerung von sprödem Mahlgut mit einer selektiven Desagglomeration, Durchführung des Verfahrens sowie Anlage zur Durchführung des Verfahrens - Google Patents

Verfahren zur Zerkleinerung von sprödem Mahlgut mit einer selektiven Desagglomeration, Durchführung des Verfahrens sowie Anlage zur Durchführung des Verfahrens Download PDF

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Publication number
EP0489633A1
EP0489633A1 EP91403252A EP91403252A EP0489633A1 EP 0489633 A1 EP0489633 A1 EP 0489633A1 EP 91403252 A EP91403252 A EP 91403252A EP 91403252 A EP91403252 A EP 91403252A EP 0489633 A1 EP0489633 A1 EP 0489633A1
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EP
European Patent Office
Prior art keywords
deagglomeration
particles
grinding
product
mill
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Granted
Application number
EP91403252A
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English (en)
French (fr)
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EP0489633B1 (de
Inventor
Maurice Paliard
Jacques Dupuis
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Technip Energies France SAS
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CLE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the 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
    • 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
    • B02C13/1807—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 the material to be crushed being thrown against an anvil or impact plate
    • 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
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • the present invention relates to an improved process for fine grinding of solid particles of brittle materials, in particular of solid particles of brittle mineral materials.
  • brittle materials By brittle materials is meant materials which rupture under the action of mechanical forces into smaller fragments, even if an elastic deformation precedes rupture. Plastics which essentially deform without breaking are therefore excluded from this definition.
  • the grinding of the filler particles in these devices is in fact accompanied by an agglomeration of the fine particles obtained in the form of aggregates or agglomerates which it is then necessary to dissociate by a subsequent mechanical contribution, the intensity of which is usually less than that applied during grinding / agglomeration.
  • a ball mill, a sole distributor-pneumatic separator group or a calibrator separator can be used. It is also possible to use a device having only a disintegration action (EP - 84,383 and FR - 2,616,359).
  • an installation comprising a cylinder mill associated with an efficient deagglomeration device for fine grinding, said deagglomeration device preferably being integrated in the separator allowing to select the finished product leaving the grinding installation (M. PALIARD-F. COCHET-Zement Kalk Gips-2-1990-pp 71 to 76).
  • the deagglomeration device was chosen to be very efficient (deagglomeration rate of 80 to 85%) to allow the extraction of as much finished product as possible on each pass. Operation of the installation has shown that this leads to significant energy consumption for the only disaggregation and to difficulties in producing the finest cements.
  • the object of the present invention is to avoid an unnecessary waste of energy to deagglomerate the most resistant agglomerates formed during press crushing and which it has been observed that they can be very economically disintegrated by a new application of l compression shear crushing force in the cylinder press.
  • the object of the invention is also an installation grinding machine allowing the grinding of the finest products under economical conditions, with a roller press.
  • the invention relates to a method and equipment which makes it possible to reduce the overall energy consumption and the wear of the equipment in a grinding installation mainly comprising a roller press, a deagglomerator and a particle separator, preferably a separator pneumatic.
  • the desired effect is obtained by maintaining between 10 and 60% and preferably between 20 and 50% the overall rate of deagglomeration of the deagglomerator placed in the circuit (measured for the passer-by at d50). This has the effect of transferring part of the work of deagglomeration to the main grinding equipment, namely the roller press where this deagglomeration is carried out for negligible additional energy and wear cost.
  • the invention is based on the surprising observation that a selective deagglomeration makes it possible to use more economically on the one hand the pressure forces of the roller mill and on the other hand the impact forces of the deagglomerator.
  • the method of the invention comprises the stages which consist in subjecting to a grinding, in a slow compression grinding zone, in particular in a roller mill, a brittle raw material, in starting elementary grains, under formation conditions of elementary grain aggregates smaller than the elementary grains of the starting raw material, said grinding being followed by a controlled deagglomeration of said aggregates, in a deagglomeration and separation zone between sufficiently fine particles, which are removed from the process, and insufficiently fine particles, which are recycled to the grinding zone, characterized in that the deagglomeration rate (yield) is maintained between 10 and 60% and preferably between 20 and 50% in the deagglomeration zone.
  • the disagglomeration rate being defined by the weight ratio between the quantity of passers-by released by the disaggregation and the maximum quantity of passers-by liberated, measured for a determined grain size and preferably for the mesh d50 of the finished product.
  • FIG. 1 represents a known grinding circuit, in a closed circuit, where the raw material of the duct 1 arrives in the grinder 2 then enters the separator 3. After selection the finished product leaves in 4 and the coarsest particles which leave through the conduit 5 is recycled to the crusher at 6.
  • This grinding circuit is preferably used when the material does not agglomerate or only agglomerates slightly during grinding.
  • FIG. 2 represents another known mode of grinding system used in the case where the material undergoes agglomeration during the grinding process.
  • the raw material crushed and agglomerated in the apparatus 2 undergoes disintegration in the apparatus 7, in order to destroy the agglomerates formed.
  • the material is then sorted in a separator 3 to extract the finished product and only the largest elementary particles are recycled in the crusher at 6.
  • an apparatus of the type impact crusher, vibrating mill or ball mill In known installations of this type, in order to achieve the most complete disintegration of the material, generally used as disintegrator No. 7, an apparatus of the type impact crusher, vibrating mill or ball mill. A disintegration is thus often carried out, often accompanied by additional grinding of the material.
  • FIG. 3 represents a particular and preferred embodiment in accordance with the invention.
  • the raw material coming from 1 is distributed by the directional flap 12 towards the feed to the mill 1 by 11 and towards the apparatus n ° 8 by 13.
  • the ground material and agglomerated in the crusher 2 is divided into two streams by the directional flap 14, part of this material is directly recycled through the conduit 16 to the crusher 1 without having undergone any treatment, while the other fraction of the material is directed by the conduit 15 in the apparatus 8.
  • the apparatus 8 is a deagglomerator which operates under conditions ensuring a partial and selective deagglomeration of the aggregates present in the material coming from the duct 15.
  • the apparatus 9 is a separator, for example an air (pneumatic) separator, which receives the material coming from the selective deagglomerator 8.
  • the latter is preferably designed so as to be integrated into the separator 9 to simultaneously perform the disaggregation and sorting functions.
  • the finished product is evacuated from the separator 9 through the conduit 4, while the rejects from the separator 9, evacuated through the conduit 5, are returned to the mill 2 with the material coming from the conduit 16.
  • said aggregates are subjected to mechanical forces, preferably controlled shocks.
  • the factors which can be acted upon are, for example, the intensity of the shocks, their number, the shape of the surfaces exerting these shocks, the speed of rotation in the case of beaters rotating around an axis and the residence time.
  • the equipment used to achieve the most economical possible deagglomeration of the product crushed by the roller press combines shocks, preferably at low impact speed, with hard surfaces and shears in a dense layer of "suspended" matter "in air or other inert gas.
  • the average impact speed is advantageously from 3 to 100 m / s, preferably 5 to 30 m / s.
  • the deagglomerator is advantageously a deagglomerator with a vertical axis; it is preferably integrated into the construction of the pneumatic separator and rotated on the same shaft as the separator selection turbine (EP - 80 104 199.7).
  • the impact blades of metal, ceramic or other wear-resistant material are distributed on a horizontal ring rotating at a speed such that the impact speed in the center of the blade, (average impact speed ) is preferably between 8 and 26 m / s and even more preferably between 8 and 16 m / s.
  • the impact blades rotate inside a cylinder coated with shielding, the relief of which opposes the rotational movement of the material entrained by the blades.
  • the amplitude of this relief is advantageously between 1% and 6% of the diameter of this cylinder and preferably between 2% and 4% of the diameter.
  • the shearing forces are mainly exerted in the shear chamber between the impact plates and the shield of the outer cylinder.
  • the volume of this chamber is very usefully between 0.0001 and 0.001 m3 per t / h of product to deagglomerate and preferably between 0.00015 and 0.0006 m3 per t / h of product to deagglomerate.
  • the impact surface of the blades is oriented upward and outward relative to the vertical plane which comprises the radius of the disc passing through the center of the plate.
  • the upward orientation angle is preferably between 3 and 30 °, the outward orientation angle is preferably between 5 and 45 °.
  • the material is fed by one or more chutes by gravity to the right of the upper face of the ring described by the impact blades and flows by gravity down from the shear chamber.
  • the deagglomerator is located inside the pneumatic separator and the material flows directly from the shear chamber onto the distributor plate located on the upper face of the selection turbine of the pneumatic separator.
  • the disaggregation rate for a grinding circuit is preferably measured for the sieve mesh corresponding to the d50 of the finished product (it is the theoretical sieve mesh that 50% of the finished product would pass through).
  • the deagglomeration rate for a given product is measured on the pass to d50 of the finished product as follows:
  • this product (A) is suspended in a liquid which does not react with it and dispersed by mechanical agitation and application of ultrasound for as long as necessary so that the particle size no longer changes.
  • the liquid is for example an alcohol such as methanol, ethanol or propanol, an ether or a hydrocarbon such as benzene, hexane or the like.
  • the mesh d50 of the finished product is measured on the finished product dispersed in a liquid medium by stirring and application of ultrasound as long as necessary so that the particle size does not change any more. The measurement is carried out by laser particle size in liquid medium.
  • the mesh d50 is the dimension such that 50% of the particles are larger than this dimension and 50% of the particles are smaller than this dimension.
  • an installation comprising a roller mill supplied with cement clinker, a deagglomerator and a pneumatic sorter.
  • the grinding process according to the invention makes it possible to reduce the disagglomeration energy by more than 50% without increasing the grinding energy compared to the prior art, ie an economy of 0.2 to 0.6 Kwh / t of finished product. This corresponds to a saving of 1 to 3% on the grinding energy.
  • the grinding process according to the invention by making it possible to recycle these fine particles in the form of an agglomerate, ensures the feed stability of the feed to the press.
  • the method according to the invention makes it possible to increase the speed of rotation of the press and therefore its flow rate from 20 to 100%.
  • the grinding process according to the invention makes it possible to use the same drive (motor, reducer, shaft) for the deagglomerator and the pneumatic selector, which is a source of savings in investment and d maintenance, without having to resort to sophisticated systems (multiple rows of grinding fingers for example) costly in wear parts.
  • the invention also relates to an installation for implementing the method described above.
  • This installation comprises at least one slow compression mill, means for deagglomerating and sorting the product from the slow compression mill and means for collecting the sorted fine particles and for returning the sorted large particles to the slow compression mill.
  • This installation is equipped with means for withdrawing and analyzing at least a fraction of the products from the supply of the means for deagglomerating, and at least a fraction of the products originating from the deagglomerator, the analysis means being adapted to determine the disaggregation rate between the entry and exit of disaggregation means.
  • the installation is such that the crusher is a roller crusher and the means for deagglomeration and sorting include means for simultaneously suspending the particles in the gas and subjecting the particles suspended in the gas to impacts and separating the relatively fine particles from the relatively large particles which result from these impacts.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Saccharide Compounds (AREA)
  • Fertilizers (AREA)
  • Processing Of Solid Wastes (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Cosmetics (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
EP91403252A 1990-12-06 1991-11-29 Verfahren zur Zerkleinerung von sprödem Mahlgut mit einer selektiven Desagglomeration, Durchführung des Verfahrens sowie Anlage zur Durchführung des Verfahrens Expired - Lifetime EP0489633B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9015316 1990-12-06
FR9015316A FR2670135B1 (fr) 1990-12-06 1990-12-06 Procede de broyage de matieres cassantes comportant pour la mise en óoeuvre du procede une desagglomeration selective et installation.

Publications (2)

Publication Number Publication Date
EP0489633A1 true EP0489633A1 (de) 1992-06-10
EP0489633B1 EP0489633B1 (de) 1996-01-03

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ID=9402982

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EP91403252A Expired - Lifetime EP0489633B1 (de) 1990-12-06 1991-11-29 Verfahren zur Zerkleinerung von sprödem Mahlgut mit einer selektiven Desagglomeration, Durchführung des Verfahrens sowie Anlage zur Durchführung des Verfahrens

Country Status (8)

Country Link
US (1) US5333798A (de)
EP (1) EP0489633B1 (de)
JP (1) JPH067694A (de)
AT (1) ATE132396T1 (de)
DE (2) DE69116115T2 (de)
ES (1) ES2084798T3 (de)
FR (1) FR2670135B1 (de)
PT (1) PT99716B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1023237B1 (fr) * 2015-12-02 2017-01-06 Pardefi Sa Procede de traitement et de valorisation des materiaux contenant de l'amiante
EP3175932A1 (de) * 2015-12-02 2017-06-07 Pardefi SA Verfahren zur umwandlung von asbest-enthaltenden produkte

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946369A (en) * 1989-06-19 1990-08-07 Dow Corning Corporation Silicone mold and elastomer tool life
DE202008013118U1 (de) 2008-06-13 2009-01-22 Braunschweigische Maschinenbauanstalt Ag Vorrichtung zur Herstellung kompaktierter Formlinge sowie Schneidsatz
US9067213B2 (en) * 2008-07-02 2015-06-30 Buhler Ag Method for producing flour and/or semolina
FR2959679B1 (fr) * 2010-05-05 2015-02-20 Fives Fcb Procede de broyage d'une matiere minerale contenant au moins du calcium et des impuretes metalliques, et installation convenant pour le broyage d'une matiere minerale contenant du calcium et des impuretes metalliques en tant que tels.
US8789784B2 (en) * 2010-05-14 2014-07-29 Ange Construction Co. Mobile self-contained loading and crushing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220681B1 (de) * 1985-10-29 1991-05-29 Klöckner-Humboldt-Deutz Aktiengesellschaft Einrichtung zur Zerkleinerung und Mahlung von feuchtem spröden Mahlgutes

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
SE410561B (sv) * 1973-04-13 1979-10-22 Boliden Ab Anleggning for autogen eller semiautogen malning av styckeformigt material, serskilt malm
US4296864A (en) * 1979-07-17 1981-10-27 Onoda Cement Co., Ltd. Air classifier
DE3302176A1 (de) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes
DE3506486A1 (de) * 1985-02-23 1986-08-28 Klöckner-Humboldt-Deutz AG, 5000 Köln Einrichtung zur zerkleinerung und mahlung sproeden mahlgutes wie zum beispiel zementklinker, erz, kohle oder dergleichen
FR2610540B1 (fr) * 1987-02-10 1990-08-10 Cle Procede de broyage de matieres minerales quelconques et installation pour la mise en oeuvre de ce procede
DE3712147A1 (de) * 1987-04-10 1988-10-20 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von sproedem mahlgut
DE3719251A1 (de) * 1987-06-10 1988-12-22 Kloeckner Humboldt Deutz Ag Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes
FR2628412B1 (fr) * 1988-03-14 1992-02-14 Cle Procede de preparation d'un melange de matieres minerales et produit broye et agglomere obtenu par ce procede
FR2634402B1 (fr) * 1988-07-22 1992-04-03 Cle Procede de broyage et compactage d'une matiere minerale quelconque et installation pour la mise en oeuvre de ce procede
DE8916267U1 (de) * 1989-02-20 1996-08-08 Kloeckner Humboldt Deutz Ag Sichter zum Sichten von körnigem Gut und Mahlanlage mit Einschaltung eines solchen Sichters
DE3926882A1 (de) * 1989-08-16 1991-02-21 Kloeckner Humboldt Deutz Ag Kreislaufmahlanlage zur mahlung von sproedem gut

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220681B1 (de) * 1985-10-29 1991-05-29 Klöckner-Humboldt-Deutz Aktiengesellschaft Einrichtung zur Zerkleinerung und Mahlung von feuchtem spröden Mahlgutes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1023237B1 (fr) * 2015-12-02 2017-01-06 Pardefi Sa Procede de traitement et de valorisation des materiaux contenant de l'amiante
EP3175932A1 (de) * 2015-12-02 2017-06-07 Pardefi SA Verfahren zur umwandlung von asbest-enthaltenden produkte

Also Published As

Publication number Publication date
DE69116115T2 (de) 1996-08-22
JPH067694A (ja) 1994-01-18
FR2670135A1 (fr) 1992-06-12
DE69116115D1 (de) 1996-02-15
DE489633T1 (de) 1992-09-24
US5333798A (en) 1994-08-02
ES2084798T3 (es) 1996-05-16
PT99716B (pt) 1999-02-26
EP0489633B1 (de) 1996-01-03
ATE132396T1 (de) 1996-01-15
PT99716A (pt) 1994-01-31
FR2670135B1 (fr) 1993-03-26

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