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WO1993008916A1 - Procede de broyage d'un materiau finement divise - Google Patents

Procede de broyage d'un materiau finement divise Download PDF

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Publication number
WO1993008916A1
WO1993008916A1 PCT/FI1992/000301 FI9200301W WO9308916A1 WO 1993008916 A1 WO1993008916 A1 WO 1993008916A1 FI 9200301 W FI9200301 W FI 9200301W WO 9308916 A1 WO9308916 A1 WO 9308916A1
Authority
WO
WIPO (PCT)
Prior art keywords
jet mill
coarse fraction
pressure roller
counter jet
roller 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
PCT/FI1992/000301
Other languages
English (en)
Inventor
Jouko Niemi
Josef Steindl
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.)
Finnpulva Oy AB
Original Assignee
Finnpulva Oy AB
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 Finnpulva Oy AB filed Critical Finnpulva Oy AB
Publication of WO1993008916A1 publication Critical patent/WO1993008916A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B02C23/08—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
    • 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
    • B02C19/065—Jet mills of the opposed-jet type
    • 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

Definitions

  • This invention refers to a method for increasing the ef ⁇ ficiency of grinding finely divided material, wherein primary material is ground and dried in a counter jet mill and the formed product is classified into a fine fraction and a coarse fraction, and the coarse fraction obtained is returned to the counter jet mill for regrinding.
  • the counter jet grinding technique is suitable in grinding a lot of different materials. With the above disclosed method very high quality end products will be obtained to moderate costs, but for some materials the coarse fraction part will increase rapidly and a lot of energy will be consumed to recirculate this increased part.
  • the specific weight of the coarse fraction returning to the counter jet mill is also often remarkably lower than the specific weight of the primary feed material, and for this reason the grinding efficiency of the counter jet mill will dec ⁇ rease remarkably due to the changes in the specific weight of the materials to be ground. The specific weight changes of the material to be ground will thus increase the grin ⁇ ding costs.
  • the purpose of the present invention is to eliminate these problems and to increase the efficiency of the grinding process. This is achieved by the method, which is charac ⁇ terized in that the coarse fraction is led via a pressure roller crusher to the feed funnel of the counter jet mill.
  • the efficiency of the grinding process can be increased remarkably, because new micro cracks and cracks will be formed into the coarse fraction particles when they pass through the pressure roller crusher, which cracks will facilitate further grinding of these particles in the counter jet mill during the next grinding step. Due to the method according to the invention the weight ratio between the the coarse fraction and the fine fraction will decrease remarkably, i.e. the efficiency of grinding pro ⁇ cess will increase.
  • Materials suitable for the counter jet ginding technique can be chared into three different groups due to their physical properties.
  • the particles of materials belonging to group one are brittle and hard, and possibly hardened by water such as water granulated blast-furnace slag.
  • the particles of materials belonging to group two are undama ⁇ ged and undisintegrated, such as natural minerals, quartz and zirconium sand.
  • fig. 1 shows a flow sheet of a base device for carrying out the method according to this invention
  • fig. 2 shows a flow sheet of an alternative device
  • fig. 3 shows a flow sheet of a prefered device for car- rying out the method according to the invention.
  • finely divided primary materi ⁇ al is fed from a silo 1 into a feed funnel 2 of a counter jet mill, and therefrom it is fed by means of a double valve feeder 3 into a pressurized equalizing tank 4 and therefrom by the influence of a srew feeder 5 further-as an uniform material flow into a fluidizing tank 6, wherein the material is fluidized by means of a working gas flow.
  • a working gas material mixture is accelerated by means of the super pressure maintained in the fluidizing tank 6 through a bisecting device 7 and two substantially oppositely directed, long accelerating nozz ⁇ les 8 into a grinding chamber 9, wherein the material par ⁇ ticles rushing from the oppositely directed accelerating nozzles 8 collide against each other at a very high speed and are ground due to the strong collision influence.
  • the ground material-working gas mixture rushes from the grin ⁇ ding chamber 9 further to a pneumatic centrifugal classi ⁇ fier 10 wherein the solid particles of the material wor ⁇ king gas mixture are classified into a fine fraction and a coarse fraction.
  • the fine fraction i.e.
  • the end product is removed from the classifier 10 as a continuous material working gas flow through the outlet pipe 11 for the fine fraction.
  • the coarse fraction is accumulated into a pocket 12 outside the pheripheral face of the classifier 10, whe- refrom it is removed batchwise into a feed pipe 14 of a pressure roller crusher 13 beneath the pocket 12.
  • a pressure roller crusher 13 When the solid particles of the coarse fraction pass through the pressure roller crusher 13 as a thick material mat, they will be at least partly crushed and at the same time new micro cracks and cracks will be formed in the particles.
  • the pressed material clods formed in the pressure roller crusher 13 are returned or dropped into the feed funnel 2 of the counter jet mill in order to be regrinded.
  • micro cracks and cracks formed in the solid particles will remar ⁇ kably facilitate the further grinding of the material particles in the counter jet mill 9. Further the feeding of the material into the counter jet mill 9 will be more effective, because the specific weight of the material clods coming from the pressure roller crusher 13 is often many times higher than the specific weight of untreated coarse fraction.
  • Primary materials belonging to group one, having brittle and hard particles, can preferably be ground in the device shown in fig.l ⁇
  • the material to be ground belongs to group two having substantially undamaged and undisintegrated particles it will be prefered that primary material is led through a pressure roller crusher 15 of their own, as shown in fig. 2, to the feed funnel 2 of the counter jet mill 9, whereby these particles will be partly crushed and at the same ti ⁇ me new cracks and micro cracks facilitating grinding will be formed in the particles.
  • a common pressure roller crusher cannot be used at least not without any auxiliary devices.
  • the specific weight of the coarse fraction can preferably be mechani ⁇ cally increased by pressing away the air which is contained in the spaces between the solid particles of the coarse fraction during the feeding of the coarse fraction. This could be achieved for instance by means of a pressure screw 16 and a pair of rollers 17 cooperating with this screw or alternatively by means of one or several pressure pistons.
  • the specific weight of the coarse fraction has been increased in this way its physical properties will be more similar to those of the primary material, whereby such a pressurized coarse fraction and primary material can be treated together without problems i a common pressure roller crusher, as disclosed in figure 3.
  • test number 1 no pressure roller crusher was used at all, but the primary material was fed directly into the feed funnel of a jet mill acting in a closed loop with a FPC-classifier.
  • test number two the primary material was predisintegra- ted with a pressure roller crusher before feeding into the jet mill used in the previous test.
  • test number 3 In test number three primary material was fed directly into the feed funnel of the jet mill used in the previous tests but the feedback of the FPC-classifier i.e. the coarse fraction was fed via a pressure roller crusher back to the feed funnel in ac ⁇ cordance with figure 1 of this application. The results of these test are disclosed in the table below.
  • Circulation load means the ratio between the feedback or Coarse fraction and the end product in per cent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

Procédé permettant d'améliorer l'efficacité du broyage d'un matériau finement divisé. Il consiste à broyer une matière première dans un broyeur à jets contraires (9), et à trier le produit ainsi formé afin d'obtenir une fraction fine et une fraction grossière que l'on réintroduit dans le broyeur (9). Le procédé est caractérisé en ce que la fraction grossière est amenée à l'entonnoir d'alimentation (2) du broyeur par un broyeur à cylindres presseurs (13).
PCT/FI1992/000301 1991-11-06 1992-11-06 Procede de broyage d'un materiau finement divise Ceased WO1993008916A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI915230 1991-11-06
FI915230A FI915230L (fi) 1991-11-06 1991-11-06 Foerfarande foer malning av finfoerdelat material

Publications (1)

Publication Number Publication Date
WO1993008916A1 true WO1993008916A1 (fr) 1993-05-13

Family

ID=8533439

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1992/000301 Ceased WO1993008916A1 (fr) 1991-11-06 1992-11-06 Procede de broyage d'un materiau finement divise

Country Status (3)

Country Link
AU (1) AU2911192A (fr)
FI (1) FI915230L (fr)
WO (1) WO1993008916A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045848A1 (fr) * 1999-12-20 2001-06-28 Bcde Group Waste Management Ltd. Oy Procede et equipement d'alimentation d'un broyeur a contre-jet
DE102022003499A1 (de) 2022-09-22 2024-03-28 Hosokawa Alpine Aktiengesellschaft Verfahren zur Reduzierung des spezifischen Energieverbrauchs bei der Zerkleinerung von Material durch Kombination von Gutbettmahlung und Strahlmahlung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003220A1 (fr) * 1985-11-29 1987-06-04 Larox Oy Appareil de production d'un produit trie en fines
WO1988001906A1 (fr) * 1986-09-10 1988-03-24 Larox Oy Procede et equipement pour la production de poudres seches particulierement fines
WO1989009652A1 (fr) * 1988-04-05 1989-10-19 Olmar Ab Procede et appareil servant au broyage autogene essentiellement de minerais heterogenes a surcompetence

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003220A1 (fr) * 1985-11-29 1987-06-04 Larox Oy Appareil de production d'un produit trie en fines
WO1988001906A1 (fr) * 1986-09-10 1988-03-24 Larox Oy Procede et equipement pour la production de poudres seches particulierement fines
WO1989009652A1 (fr) * 1988-04-05 1989-10-19 Olmar Ab Procede et appareil servant au broyage autogene essentiellement de minerais heterogenes a surcompetence

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045848A1 (fr) * 1999-12-20 2001-06-28 Bcde Group Waste Management Ltd. Oy Procede et equipement d'alimentation d'un broyeur a contre-jet
DE102022003499A1 (de) 2022-09-22 2024-03-28 Hosokawa Alpine Aktiengesellschaft Verfahren zur Reduzierung des spezifischen Energieverbrauchs bei der Zerkleinerung von Material durch Kombination von Gutbettmahlung und Strahlmahlung

Also Published As

Publication number Publication date
FI915230A7 (fi) 1993-05-07
AU2911192A (en) 1993-06-07
FI915230A0 (fi) 1991-11-06
FI915230L (fi) 1993-05-07

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