EP0508109A2 - Procédé de tamisage d'une matière à grains fins - Google Patents

Procédé de tamisage d'une matière à grains fins Download PDF

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Publication number
EP0508109A2
EP0508109A2 EP92103817A EP92103817A EP0508109A2 EP 0508109 A2 EP0508109 A2 EP 0508109A2 EP 92103817 A EP92103817 A EP 92103817A EP 92103817 A EP92103817 A EP 92103817A EP 0508109 A2 EP0508109 A2 EP 0508109A2
Authority
EP
European Patent Office
Prior art keywords
screening
fine
grained
coarse
substrate
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.)
Withdrawn
Application number
EP92103817A
Other languages
German (de)
English (en)
Other versions
EP0508109A3 (en
Inventor
Reiner Dipl.-Ing. Schiffbauer
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Publication of EP0508109A2 publication Critical patent/EP0508109A2/fr
Publication of EP0508109A3 publication Critical patent/EP0508109A3/de
Withdrawn legal-status Critical Current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
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
    • B02C19/186—Use of cold or heat for disintegrating
    • 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
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets

Definitions

  • the particularly difficult to sieve powders include, in particular, electrostatically charging substances such as plastic powders (e.g. PVC, polystyrene, polyethylene, polypropylene etc.). Also fabrics with a fibrous grain shape, e.g. Tobacco dust, tea, leaf drugs, etc., cause difficulties when sieving. Materials with a low specific weight, such as carbon powder and natural graphite, are also problematic.
  • plastic powders e.g. PVC, polystyrene, polyethylene, polypropylene etc.
  • fabrics with a fibrous grain shape e.g. Tobacco dust, tea, leaf drugs, etc.
  • Materials with a low specific weight such as carbon powder and natural graphite, are also problematic.
  • the screening aids include e.g. Tapping balls that hit the underside of the screen deck or brushes that pass the screenings through the mesh of the screen.
  • the present invention has for its object to provide a screening method with which an effective screening, in particular difficult to screen screenable material is ensured without the disadvantages of conventional methods.
  • This object is achieved in that a coarse-grained substrate is added to the screenings before and / or during the screening process.
  • the coarse-grained substrate has a grain size that is well above the mesh size of the screen fabric, so that it is not itself subjected to screening.
  • the much larger substrate particles act as a sieve aid for the very fine sieve particles and drive them through the sieve meshes, unaffected by electrostatics and drafts.
  • a coarse-grained substrate for example, granulate comes into question, the particle size of which is many times larger than the mesh size of the screen fabric.
  • a substance specific to the material to be screened is used as the coarse-grained substrate.
  • the screening process is integrated into a process for comminuting coarse-grained substrate.
  • the coarse-grained substrate for example coarse-grained granules such as plastic particles, spice grains, nuts etc.
  • the fine-grained powder is fed into a simple mesh screen in order to obtain a powder with a defined upper grain limit.
  • the coarse-grained substrate is mixed with the fine-grained powder, preferably in a mixer provided, for example, with a screw drive. The many times larger particles of the coarse-grained substrate drive the fine powder particles through the sieve mesh.
  • the comminution of the coarse-grained substrate is preferably carried out downstream of the screening, the fine-grained screenings resulting from the comminution being returned to the screening.
  • the coarse-grained substrate to be shredded is first mixed with the material to be screened before and / or during the sieving process, is then removed from the sieve and finally fed to the shredding.
  • the coarse-grained substrate is expediently comminuted in a cold grinding system, the coarse-grained substrate being cooled by means of a cryogenic refrigerant before and / or during the comminution.
  • This produces cold exhaust gas which is preferably used at least partially to purge the sieve and / or the mixer.
  • a sieving of very fine powders is achieved with the advantage of an exactly defined upper grain limit and a very low proportion of missing grains.
  • pre-cooling of the coarse-grained substrate to be shredded and a reduction in the refrigerant consumption are additionally achieved.
  • Standard vibrating, circular vibrating, tumbling or drum sieves can be used as sieves without special additional devices, e.g. Brushing or tapping devices are used.
  • the cold grinding plant shown in FIG. 1 is for the comminution of coarse-grained substrate, in particular from granules, such as plastic granules, to fine-grained powder.
  • the granules are fed via a feed line 1 and a cell wheel 2, which is switched into the feed line 1 and serves for dosing, to a mixer 3 which has, for example, a worm drive.
  • the mixer 3 the granulate is homogeneously mixed with the fine-grained powder which is obtained in the comminution of the granulate in a downstream mill 4 and which is to be fed to the sieving as sieving material.
  • the resulting mixture is fed via a feed 5 of a screening machine 6.
  • the screening machine 6 can be, for example, a standard vibrating, circular vibrating, tumbling or drum screen.
  • the many times larger granulate particles serve as a sieving aid for the fine-grained powder and drive the very fine powder particles through the sieve meshes, unaffected by electrostatics and drafts.
  • the fine material driven through the sieve mesh which has a precisely defined upper grain limit, is drawn off via line 7 for further use.
  • the granules which do not pass through the sieve mesh are first fed to an intermediate container 9 via line 8 and then fed via a metering cell wheel 10 to a cooling screw 11 which is charged with a cryogenic refrigerant, in particular liquid nitrogen.
  • the frozen and embrittled granules are fed via line 12 to the mill 4, which can be designed, for example, as a hammer mill.
  • the frozen granulate is ground into very fine powder with grain sizes in the micrometer range.
  • the powder is drawn off via line 13 and fed to a cyclone 14, in which fine dust is separated off.
  • the fine dust is extracted from the cyclone 14 by means of a fan 17 and passed through a filter 15.
  • the resulting filter dust is drawn off via line 16.
  • the powder intended as screenings is fed to the mixer 3 via line 18, in which it is homogeneously mixed with the granules to be comminuted.
  • the regrind is also pre-cooled, as a result of which the consumption of cryogenic refrigerant during cold grinding is reduced.
  • Cold exhaust gas occurring in the cooling screw 11 is drawn off via an exhaust gas line 19 and partly led via a flushing gas line 20 to the mixer 3 and to the screening machine 6 in order to purge these parts of the system with cold gas, which likewise results in pre-cooling of the ground material.
  • the rest of the exhaust gas is released to the atmosphere together with the exhaust air drawn off from the filter 15 via line 21 and an interposed throttle valve 22.
  • Figure 2 shows a comparison of the sieving results of test sieving with polyester powder.
  • a 125 mm mesh screen was used, which worked as a circular oscillator.
  • the diagram shows the distribution of fine and coarse material (whereby “fine material” means particles with a particle size below a defined upper grain limit, which is determined by the mesh size of the sieve; while “coarse material” denotes such particles, whose size is above the upper grain limit).
  • Graph I shows the result of a screening according to the prior art, i.e. without adding granules.
  • the graphs 11 and 111 show the results of the screening according to the invention, wherein in case 11 a granulate content of 50% was set in the fine material, while in case III the granulate content was 33%.
  • the effective coarse material fraction (G) i.e. the fraction of particles that cannot pass through the sieve mesh due to their size
  • G the effective coarse material fraction
  • FG coarse material
  • F the proportion of the fine material discharge

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP19920103817 1991-03-12 1992-03-06 Method for screening a fine-grained material Withdrawn EP0508109A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4107872 1991-03-12
DE19914107872 DE4107872A1 (de) 1991-03-12 1991-03-12 Verfahren zum sieben eines feinkoernigen siebgutes

Publications (2)

Publication Number Publication Date
EP0508109A2 true EP0508109A2 (fr) 1992-10-14
EP0508109A3 EP0508109A3 (en) 1993-03-24

Family

ID=6427042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920103817 Withdrawn EP0508109A3 (en) 1991-03-12 1992-03-06 Method for screening a fine-grained material

Country Status (2)

Country Link
EP (1) EP0508109A3 (fr)
DE (1) DE4107872A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007004A1 (de) 2010-02-05 2011-08-11 Linde AG, 80331 Verfahren zum Sieben oder Sichten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB863093A (en) * 1958-04-01 1961-03-15 Beteiligungs Uend Patentverwal Oscillating sieve for greasy material
US4249906A (en) * 1979-12-17 1981-02-10 Howell Phillip C Method and apparatus for handling flux fines
EP0044506A1 (fr) * 1980-07-18 1982-01-27 TYCZKA GmbH & Co. Gesellschaft für Gase, Wassertechnik, Engineering Procédé de séparation de matières plastiques différentes
EP0221377A2 (fr) * 1985-11-02 1987-05-13 Fried. Krupp Gesellschaft mit beschränkter Haftung Procédé pour le broyage fin de matières minérales et dispositif pour la mise en oeuvre du procédé
EP0238432A2 (fr) * 1986-02-14 1987-09-23 Nordberg Inc. Méthode et dispositif de broyage à haut rendement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB863093A (en) * 1958-04-01 1961-03-15 Beteiligungs Uend Patentverwal Oscillating sieve for greasy material
US4249906A (en) * 1979-12-17 1981-02-10 Howell Phillip C Method and apparatus for handling flux fines
EP0044506A1 (fr) * 1980-07-18 1982-01-27 TYCZKA GmbH & Co. Gesellschaft für Gase, Wassertechnik, Engineering Procédé de séparation de matières plastiques différentes
EP0221377A2 (fr) * 1985-11-02 1987-05-13 Fried. Krupp Gesellschaft mit beschränkter Haftung Procédé pour le broyage fin de matières minérales et dispositif pour la mise en oeuvre du procédé
EP0238432A2 (fr) * 1986-02-14 1987-09-23 Nordberg Inc. Méthode et dispositif de broyage à haut rendement

Also Published As

Publication number Publication date
EP0508109A3 (en) 1993-03-24
DE4107872A1 (de) 1992-09-17

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