EP0489634A1 - Procédé de broyage de matières minérales - Google Patents

Procédé de broyage de matières minérales Download PDF

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Publication number
EP0489634A1
EP0489634A1 EP91403253A EP91403253A EP0489634A1 EP 0489634 A1 EP0489634 A1 EP 0489634A1 EP 91403253 A EP91403253 A EP 91403253A EP 91403253 A EP91403253 A EP 91403253A EP 0489634 A1 EP0489634 A1 EP 0489634A1
Authority
EP
European Patent Office
Prior art keywords
particles
rollers
mill
recycling rate
crusher
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.)
Ceased
Application number
EP91403253A
Other languages
German (de)
English (en)
French (fr)
Inventor
Maurice Paliard
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.)
CLE
Original Assignee
CLE
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 CLE filed Critical CLE
Publication of EP0489634A1 publication Critical patent/EP0489634A1/fr
Ceased legal-status Critical Current

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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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding devices
    • 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
    • B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
    • B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
    • 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
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of 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 mineral materials, in particular of solid particles of brittle and / or fragile (non-plastic) mineral materials.
  • roller mill also called drums or cylinders
  • a spring, a piston or the like exerts a force tending to bring the rollers closer and therefore to oppose the spreading effect produced by the passage of the material between the rollers.
  • the two (or more) rollers can be equipped with a mechanical drive system, or a single roller is equipped with this system, the other roller being simply mobile and driven by friction by the flow of particles moving down between the rollers substantially horizontal and parallel.
  • the two rollers rotate in opposite directions to one another so as to drive down the bed of material which separates them.
  • agglomerates are normal phenomenon, which must be passed when one wants to make fine grinding, and previous work shows that this formation is all the more important as the applied force is higher and the fineness sought itself higher, and also that it depends very much on the nature of the material treated, the formation of agglomerates with quartz, for example, only being done for extremely high pressures.
  • the first consists of grinding grain by grain, which supposes that the grains, or a large majority of them, for example at least 90%, have a size larger than that of the inter-roller space (the slot).
  • the second is bed milling, in which case the particles have all, or the vast majority, a size equal to or less than that of the inter-roller space.
  • the third combines the two modes, namely grinding grain by coarse grain followed, in a narrower part of the slot, by grinding in a bed.
  • the present invention remedies the defects of the prior art by proposing a method which combines, in an entirely new way, the pressure forces and the shear forces.
  • the space located above the slot between the rollers is fed at a rate and over a width sufficient to maintain a pile of accumulated particles of a width and a height such that the average loading angle a (distinct from the engagement angle) of the rollers is between 30 and 80 °, preferably between 35 and 70 ° and even more preferably between 40 and 65 °.
  • the angle a is that corresponding to a substantially continuous covering of each roller by the pile of accumulated particles of the load, forming a continuous bed between the two rollers.
  • FIGS 1 to 3 show various embodiments of the invention.
  • FIG. 1 illustrates the mode of definition of the angle a.
  • FIG. 2 illustrates an embodiment comprising recycling of the agglomerates without the use of a disintegrator.
  • FIG. 3 illustrates an embodiment using an apparatus for disintegrating agglomerates distinct from the roller crusher.
  • the rollers 1 and 2 receive a flow of particles to be ground 6 coming from the conduit 3, which is extended by movable flaps 4 and 5 making it possible to adjust the width of the flow reaching the surface of the rollers.
  • the ground material and which in some cases contains agglomerates is discharged at 7.
  • the angle a is that which is between the horizontal and the point of reception of a substantially continuous bed of particles as soon as they are accumulated on the height h corresponding to the angle a.
  • At least 90% of the particles of the filler have an average size (average diameter) less than 2 times the width of the slot, as it remains during operation, and very advantageously at least 90% of the particles of the load have a size at most equal to that of the slot, with a preference for a rate of at least 98%.
  • recycled particles are present, these have either a size satisfying the above requirements, if they are individual particles, or a larger apparent size in the case of aggregates, but these aggregates consist of individual particles which have the maximum size defined above. Recycled aggregates, even relatively large, are therefore considered to satisfy the stated size condition.
  • the method of the invention can be applied to all loads of brittle or fragile mineral materials and, for example, to limestone, cement clinker, various natural silicates, sand, raw materials for the manufacture of cement, some fillers with a strong tendency to agglomerate, others less or not even at all at usual pressures.
  • brittle (fragile) fillers and plastic fillers is made for example in FR - 381 569.
  • a mineral filler as defined above is treated in a single pass. If necessary, it is then passed through a deagglomerator or a sorter.
  • part of the product is recycled directly to the roller mill directly from this crusher, the recycling rate being from 1/1 to 4/1 or more, based on the weight of fresh charge feeding the crusher.
  • the portion of particles which does not have the desired fineness is separated and it is recycled, even if it is at least partly in the form of more or less particles. strongly agglomerated.
  • the recycling rate can be, for example, from 1/1 to 7/1 or more, related to the flow of fresh material.
  • the agglomerates benefit from the friction effects which are manifested early at high angles.
  • the two preferred embodiments are used simultaneously, above, the overall recycling rate being from 2/1 to 10/1, more specifically from 4.5 / 1 to 8/1 in the case of cement clinker.
  • the product leaving the roller mill is subjected to the mechanical action of an agglomerate disintegrator, in a manner known per se, before separating the large particles to be recycled, the fine particles which constitute the product sought.
  • the rollers preferably rotate at substantially the same speed to avoid the drawbacks associated with the use of different speeds, mentioned above.
  • Their peripheral speed can be, for example, from 0.3 to 10 m / s, and preferably 0.5 to 2.5 m / s, which makes it easier to maintain a high loading angle.
  • the mineral charge is passed through two successive roller mills as described for example in FR - 2 610 540.
  • FIG. 2 represents a detailed embodiment of the invention.
  • the fresh load 6 is admitted through the conduit 3 to the rollers 1 and 2 of the roller mill.
  • the ground product is sent through line 13 to the sorter 8.
  • the particles having the desired fineness are discharged through line 9 while coarse particles with any aggregates are sent through line 10 to the elevator 11 of conventional type, for be recycled through line 12 to the roller mill.
  • part of the crude product of the crusher is returned directly to the crusher by lines 16, 11, 12 and 13.
  • the ancillary devices such as springs, stops, force application pistons, and the control devices and regulation have not been shown for the sake of simplification. All these devices have been widely described in the prior art. The same applies, for example, to the configuration of the surface of the rollers (flat surface or surface provided with roughness, grooves, grooves or the like).
  • the device of Figure 3 is similar to that of Figure 2 except that it further comprises a particle disintegrator 14 following the roller mill.
  • This apparatus can be a tubular, ball, hammer, pendulum or the like.
  • the invention also includes an installation comprising a roller crusher, means for driving at least one of the rollers in rotation, the other roller (or the other rollers) being themselves driven or simply free in rotation around their axis, deflector means for adjusting the width of the bed of particles to be ground, these means allowing feeding the mill at an angle (a) of 30 to 80 °, for example.
  • Particles and aggregates larger than about 100 microns are separated at the outlet and recycled to the feed to the mill. Particles finer than about 100 microns constitute the desired product.
  • the energy consumed at the press being of the order of 2 kWh / tonne of product passing through it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Processing Of Solid Wastes (AREA)
  • Disintegrating Or Milling (AREA)
EP91403253A 1990-12-06 1991-11-29 Procédé de broyage de matières minérales Ceased EP0489634A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9015317A FR2670134A1 (fr) 1990-12-06 1990-12-06 Procede de broyage de matieres minerales.
FR9015317 1990-12-06

Publications (1)

Publication Number Publication Date
EP0489634A1 true EP0489634A1 (fr) 1992-06-10

Family

ID=9402983

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91403253A Ceased EP0489634A1 (fr) 1990-12-06 1991-11-29 Procédé de broyage de matières minérales

Country Status (5)

Country Link
EP (1) EP0489634A1 (enrdf_load_stackoverflow)
JP (1) JPH0639302A (enrdf_load_stackoverflow)
DE (1) DE489634T1 (enrdf_load_stackoverflow)
FR (1) FR2670134A1 (enrdf_load_stackoverflow)
PT (1) PT99717A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109876887A (zh) * 2019-03-07 2019-06-14 大同新成新材料股份有限公司 一种压块活性炭直立炉入料装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2549089Y2 (ja) * 1987-10-19 1997-09-24 株式会社ミツバ 正逆転駆動制御回路
CN110369033B (zh) * 2019-07-16 2021-08-06 江西亚香香料有限公司 一种化工原料研磨烘干装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2381569A1 (fr) * 1977-02-24 1978-09-22 Schoenert Klaus Procede de broyage fin et tres fin de matieres fragiles
EP0084383B1 (de) * 1983-01-24 1986-06-18 Klöckner-Humboldt-Deutz Aktiengesellschaft Verfahren zur kontinuierlichen Druckzerkleinerung spröden Mahlgutes
DE3535406A1 (de) * 1985-10-03 1987-04-09 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von mahlgut

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2381569A1 (fr) * 1977-02-24 1978-09-22 Schoenert Klaus Procede de broyage fin et tres fin de matieres fragiles
EP0084383B1 (de) * 1983-01-24 1986-06-18 Klöckner-Humboldt-Deutz Aktiengesellschaft Verfahren zur kontinuierlichen Druckzerkleinerung spröden Mahlgutes
DE3535406A1 (de) * 1985-10-03 1987-04-09 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von mahlgut

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109876887A (zh) * 2019-03-07 2019-06-14 大同新成新材料股份有限公司 一种压块活性炭直立炉入料装置

Also Published As

Publication number Publication date
FR2670134B1 (enrdf_load_stackoverflow) 1995-01-27
FR2670134A1 (fr) 1992-06-12
PT99717A (pt) 1994-01-31
DE489634T1 (de) 1992-09-24
JPH0639302A (ja) 1994-02-15

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