EP0888192B1 - Verfahren und anlage für die gleichzeitige und kontinuierliche herstellung mehrerer granulatfraktionen eines mineralischen materials - Google Patents

Verfahren und anlage für die gleichzeitige und kontinuierliche herstellung mehrerer granulatfraktionen eines mineralischen materials Download PDF

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Publication number
EP0888192B1
EP0888192B1 EP97915524A EP97915524A EP0888192B1 EP 0888192 B1 EP0888192 B1 EP 0888192B1 EP 97915524 A EP97915524 A EP 97915524A EP 97915524 A EP97915524 A EP 97915524A EP 0888192 B1 EP0888192 B1 EP 0888192B1
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Prior art keywords
grains
fraction
fractions
upper limit
dimensions
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Revoked
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EP97915524A
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English (en)
French (fr)
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EP0888192A1 (de
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André Pinoncely
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F C B ALUMINIUM
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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
    • 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
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • 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

  • the subject of the invention is a method and a walking installation. continuous to reduce a mineral material in grains of different sizes and divide the ground product into several granulometric fractions constituted each by grains whose dimensions are between a limit upper and lower limits.
  • At least two reduction devices must be used: one crusher and grinder.
  • the object of the invention is to allow simultaneous production of several fractions of different particle sizes, from a fraction of which the grains have a size of up to several tens of mm up to a fraction whose grains have dimensions of the order of a micron to a few hundred microns, using a single fragmentation device and classification devices, each fraction being calibrated and its quantity optimized.
  • Fine and coarse fractions are thus directly usable after a single grinding step.
  • the fraction intermediate it can also be subdivided.
  • the advantage of crushing by crushing in a layer of material is to allow production, in a single stage of fragmentation, of a mixture having a broad particle size spectrum and also containing many large grains (for example from 0.5 to several tens of mm) than grains forming powder (whose size is, for example, less than 300 ⁇ m).
  • the grinding is optimized.
  • crushing by crushing in a layer of material designates the grinding processes according to which a multigranular layer of product to be ground is compressed between two surfaces with pressure sufficient to cause fragmentation of grains which are reduced to grains smaller.
  • the known devices for implementing these methods are wheel mills, vertical ball or roller mills, ring, cylinder presses and vibrating cone crushers.
  • one of the classification devices will be a screen and the other may be a pneumatic separator.
  • one of the devices could be a screen or a hydraulic classification device and the other could be a hydrocyclone.
  • FIG. 1 shows a simplified installation and essentially consisting of a grinder 10, a pneumatic separator 12 and a screen 14.
  • the mill is, for example, a ring mill of the type described in French patents N ° 90 14004 and 91 09788. It consists of a drum with substantially horizontal axis inside which is arranged a annular track on which a roller, whose axis is parallel to that of the drum, is pressed by springs or cylinders.
  • the material to be ground M is introduced in the drum which rotates at a sufficiently high speed (speed higher than the critical speed) so that the material forms on the whole track a layer on which the pebble rolls.
  • the crushed products are evacuated and brought to the separator 12 by a stream of air or other gas circulating in the drum.
  • the separator 12 is of the type described in French patent N ° 90 01673. It comprises a rotor with a vertical axis provided with blades on its periphery and surrounded by vertical vanes, fixed but adjustable. The a stream of air charged with the crushed product is admitted into the separator housing from below, crosses the blade crown from the outside to the inside, then enters the rotor and is finally discharged through a central opening in the rotor. Grains whose dimensions are greater than one dimension predetermined (cutoff mesh) are projected by centrifugal force against the vanes and fall in the lower part of the casing from where they are evacuated via an outlet 16.
  • Particles whose dimensions are smaller than the mesh cut-out are driven by the air flow inside the rotor and discharged therewith via an outlet 17. They constitute the fine fraction F3 of the crushed product which is separated from the air stream in a dust filter; their dimensions can vary, for example, from 1 ⁇ m to 100 ⁇ m.
  • the products discharged through outlet 16 of separator 12 feed the screen 14. It is equipped with two fabrics or grids allowing to divide the products from separator 12 into three fractions: refusals consisting of the largest pieces (for example greater than 10 mm) which are returned to the feed to the mill, a coarse fraction F1 whose dimensions are, for example, between 1 and 10 mm, and a fraction average F2 whose dimensions are between 0.1 and 1 mm.
  • the installation allows the simultaneous production of six fractions with different particle sizes. It consists of a vibrating cone crusher 18 of the type described in the French patents n ° 93 03375 and n ° 95 06964 in the name of the applicant.
  • the product raw is brought by a conveyor 20 which feeds the crusher through a dividing member 22 allowing part of the gross product to short-circuit the grinder.
  • the ground product and the fraction of the raw product bypassing the crusher are brought by an elevator 24 on a screen 26 with two fabrics or grids.
  • the screen refusals are sent back to the grinder feed by means of a conveyor 28.
  • Products passing through the two screens of the screen feed a pneumatic separator 30, which can be, for example, of the type described above with reference to Figure 1.
  • the particle size fraction intermediate is stored in a silo 32.
  • screen refusals may be made by pieces whose dimensions are between 15 and 30 mm, the grains of the product feeding the separator 30 having a size less than 15 mm.
  • the product is separated into a fine fraction which is transported pneumatically to a second air separator 34 and a coarse fraction which feeds a screen 36 with two fabrics or grids producing three fractions of different particle sizes, for example from 5 to 15 mm, 1.5 to 5 mm and 0.2 to 1.5 mm which are stored in silos 38, 40 and 42, respectively.
  • the fine fraction is freed of dust (ultra-fine fraction, for example less than 0.02 mm) which is recovered by means of a filter 44; fine and ultra-fine fractions are stored in silos 46 and 48.
  • Silos 32, 38, 40, 42 and 46 each have an overflow which feeds the conveyor 28 making it possible to return to the inlet of the mill excess production, compared to the needs of different fractions particle size.
  • a lateral purge system with controlled extraction placed at the bottom of the silo allows evacuate the excess production of each fraction and ensure regulation level.
  • the surpluses of each fraction are, in this case also, recycled to the mill feed.
  • the storage silo for the ultra-fine fraction 48 is not equipped of an overflow or a purge system and a level regulator causes stopping the installation when the product level reaches a limit superior.
  • a regulation system makes it possible to maintain a value predefined the total flow through the mill by acting on the flow supply of raw product.
  • This system may include a hopper of feeding the mill maintained at constant level or weight or the means of measurement of the total flow recycled to the mill feed.
  • FIG. 3 illustrates an application from the invention to the preparation of coke fractions for the manufacture of anodes used for the production of aluminum by electrolysis; she permits to produce four coke fractions of different particle sizes.
  • this installation allows continuous production of four fractions formed of grains whose dimensions are between 5 and 15 mm. 1.5 and 5 mm, 0.2 and 1.5 mm and less than 0.2 mm and which are stored in silos 38 ', 40', 42 'and 48' respectively.
  • the grinder 54 is a ring of the type described above with reference to FIG. 1.
  • the crusher supplies, by means of a 24 "bucket elevator, a 26" screen whose rejections are brought back to the mill entrance by a 28 "belt conveyor. screen feeds a 30 "pneumatic separator.
  • the fine fraction extracted pneumatically the 30 "separator is free of dust (fractions ultra-fine) in a second 34 "pneumatic separator: this ultra-fine fraction is separated from the air stream by means of a 44 “filter and stored in a 48 “silo while the fine fraction (refusal of the 34" separator) is stored in a 46 "silo.
  • the rejects of the 30 "separator are brought to a screen 56 to two grids or fabrics.
  • the screen rejects are unloaded onto the 28 "conveyor, the intermediate fraction is stored in a 32 “silo and the particle size fraction lower, which has passed through the two grids of the screen 56 feeds a second screen 58 where it is divided into three new fractions which are stored in 38 ", 40" and 42 “silos, respectively.
  • This installation can be used, for example, for the preparation of mineral fillers.
  • the 26 "screen with a grid 10 mm mesh, the 56 screen of two 1 and 2 mm mesh screens and the screen 58 of two 0.3 and 0.5 mm mesh fabrics we can produce with this installation six fractions whose grain sizes will be between 1 and 2 mm, 0.5 and 1 mm, 0.3 and 0.5 mm. 0.1 and 0.3 mm, 0.02 and 0.10 mm and less than 0.02 mm, respectively.
  • silos with the exception of the 48 “silo, are fitted with an overflow allowing to return to the mill the excess production of each section, by means of the 28 "conveyor.
  • a flow control system feed to the mill allows it to be adapted to requirements.
  • the setting of parameters of the mill - force applied to the roller, residence time - allows optimize the particle size distribution of the milled product so that that it meets the needs.
  • FIG. 5 allows to treat wet materials. It includes a grinder 60, by example a vibrating cone crusher, working in a wet process, a two-sieve screen grids 62, two hydrocyclones 64 and 66 and a hydraulic classifier 68; of pipes connect these devices to each other and pumps provide circulation some products.
  • a grinder 60 by example a vibrating cone crusher, working in a wet process
  • a two-sieve screen grids 62 two hydrocyclones 64 and 66 and a hydraulic classifier 68; of pipes connect these devices to each other and pumps provide circulation some products.
  • the raw product M is brought to the inlet of the mill in the form pulp or in pieces; in the latter case water is added to the product raw in the crusher.
  • the ground product is brought to the screen 62.
  • the refusal of the screen is returned to the mill feed.
  • the product having passed through two screens are sent to the entrance to hydrocyclone 64.
  • the fraction of the product formed by the grains which have passed through the upper grid of the screen 62 but which are larger than the meshes of the lower grid, is subjected to a drainage and / or filtration to remove part of the water which is generally recycled. This fraction constitutes the coarse fraction F1 and a part can be returned to the feed to the crusher 60.
  • Hydrocyclone 64 underflow powers classifier hydraulic 68, while its overflow is sent to the hydrocyclone inlet 66.
  • the overflow and underflow of hydrocyclone 66 constitute two fine fractions G3 and F3 'which are subjected, separately, to filtration or decantation to remove the water which is recycled.
  • the overflow of hydrocyclone 66 can optionally be treated with a centrifuge 70 giving two ultra-fine fractions F4 and F4 '.
  • hydraulic classifier 68 In hydraulic classifier 68, the underflow of hydrocyclone 64 is divided into two intermediate fractions F2 and F2 'which are also subject to filtration to remove water. A part of the underflow of classifier 68 may however be returned to food of the crusher 60.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Fertilizers (AREA)
  • Seasonings (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Glanulating (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Claims (7)

  1. Verfahren zum Zerkleinern durch Zerbrechen eines Mineralstoffs zu Körnern unterschiedlicher Größen und zum Trennen des zerbrochenen Produkts in mehrere Teile, bei welchem Verfahren, ausgehend von einem Rohprodukt in Stücken, wobei die Stücke Durchmesser kleiner als oder höchstens gleich 150 mm haben, dieses einer Zerbrechung durch Zerquetschung zu einer Materialschicht unterworfen wird, die zerbrochenen Produkte in mehrere Teile getrennt werden, die einen groben Teil, einen feinen Teil und wenigstens einen Zwischenteil umfassen, und wenigstens die Körner, deren Abmessungen größer sind als der obere Grenzwert des groben Teils, und als zu große Körner bezeichnet werden, zurück zum Brecher geführt werden, dadurch gekennzeichnet, daß :
    die Teile zerbrochener Produkte jeweils aus Körnern bestehen, deren Abmessungen zwischen einem vorbestimmten oberen Grenzwert und einem vorbestimmten unteren Grenzwert liegen, wobei die Körner des groben Teils eine Korngröße zwischen 0,6 mm und wenigen Dutzenden mm haben und die Körner des feinen Teils eine Obergrenze von ungefähr 300 µm bis zu wenigen Dutzenden um haben,
    außerdem ein Produktionsüberschuß eines oder mehrerer Teile zurück zum Brecher geführt wird, indem die Parameter für den Zerbrechungsvorgang so gewählt werden, daß bei den sämtlichen Teilen die erzeugte Durchflußmenge größer als die oder wenigstens gleich der gewünschten Durchflußmenge ist.
  2. Verfahren nach Anspruch 1, bei dem die Wahl getroffen wird, bevorzugt die Körner eines oder mehrerer Zwischenteile eher als die Körner des groben Teils zurückzuführen.
  3. Anlage zur Anwendung des Verfahrens nach Anspruch 1, umfassend ein einziges Zerbrechungsgerät (10, 18, 18', 56), das ein Zerbrechen zu einer Materialschicht ausführt, und wenigstens zwei Einteilungsgeräte, die es erlauben, die zerbrochenen Produkte in mehrere Teile zu trennen, die wenigens einen groben Teil, einen feinen Teil und wenigstens einen Zwischenteil umfassen, wobei eines dieser Geräte (14, 26, 26', 26") geeignet ist, von den vom Brecher kommenden Produkten diejenigen zu trennen, deren Korngröße größer ist als der obere Grenzwert des groben Teils, die als zu große Körner bezeichnet und zum Eingang des Brechers zurückgeführt werden, und wobei das andere Einteilungsgerät (12, 30, 30', 30") geeignet ist, von den zerbrochenen Produckten die Körner zu trennen, die den feinen Teil bilden, dadurch gekennzeichnet, daß :
    die genannten wenigstens zwei Einteilungsgeräte so vorgesehen sind, daß die zerbrochenen Produktteile jeweils aus Körnern bestehen, deren Abmessungen zwischen einem vorbestimmten oberen Grenzwert und einem vorbestimmten unteren Grenzwert liegen,
    die Anlage ebenfalls Mittel umfaßt, um außerdem ein Produktionsüberschuß eines oder mehrerer Teile zurück zum Brecher zu führen, wobei der genannte Brecher geeignet ist, eine Wahl der Parameter des Zerbrechungsvorgangs zu erlauben, sodaß bei den sämtlichen Teilen die erzeugte Durchflußmenge größer als die oder wenigstens gleich der gewünschten Durchflußmenge ist.
  4. Anlage nach Anspruch 3, dadurch gekennzeichnet, daß das erste Einteilungsgerät ein Sieb ist.
  5. Anlage nach Anspruch 3, dadurch gekennzeichnet, daß das erste Einteilungsgerät ein hydraulisches Einteilungsgerät ist.
  6. Anlage nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Einteilungsgerät, das geeignet ist, den feinen Teil zu trennen, ein pneumatisches Einteilungsgerät ist.
  7. Anlage nach Anspruch 3 oder 5, dadurch gekennzeichnet, daß das Einteilungsgerät, das geeignet ist, den feinen Teil zu trennen, ein Hydrozyklon oder ein Zentrifugiergerät ist.
EP97915524A 1996-03-22 1997-03-20 Verfahren und anlage für die gleichzeitige und kontinuierliche herstellung mehrerer granulatfraktionen eines mineralischen materials Revoked EP0888192B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9603577A FR2746329B1 (fr) 1996-03-22 1996-03-22 Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale
FR9603577 1996-03-22
PCT/FR1997/000492 WO1997035665A1 (fr) 1996-03-22 1997-03-20 Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale

Publications (2)

Publication Number Publication Date
EP0888192A1 EP0888192A1 (de) 1999-01-07
EP0888192B1 true EP0888192B1 (de) 2001-05-30

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ID=9490438

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EP97915524A Revoked EP0888192B1 (de) 1996-03-22 1997-03-20 Verfahren und anlage für die gleichzeitige und kontinuierliche herstellung mehrerer granulatfraktionen eines mineralischen materials

Country Status (12)

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US (1) US6042032A (de)
EP (1) EP0888192B1 (de)
AT (1) ATE201616T1 (de)
AU (1) AU726956B2 (de)
BR (1) BR9708237A (de)
CA (1) CA2248249A1 (de)
DE (1) DE69705034T2 (de)
FR (1) FR2746329B1 (de)
HR (1) HRP970167A2 (de)
NO (1) NO984395L (de)
WO (1) WO1997035665A1 (de)
ZA (1) ZA972440B (de)

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FR2759610B1 (fr) * 1997-02-19 1999-04-16 Fcb Procede et installation pour reduire un materiau brut en morceaux en un materiau en grains selon une distribution granulometrique donnee
ID30297A (id) * 2000-05-17 2001-11-22 Asahi Glass Co Ltd Metode untuk mengolah suatu gas
CA2344511A1 (en) 2001-04-19 2002-10-19 First American Scientific Corp. Method of recovery of precious metals and heavy minerals
DE102010033628A1 (de) * 2010-07-02 2012-01-05 Akw Apparate + Verfahren Gmbh Verfahren zur Nassaufbereitung von Materialien, insbesondere Erzen oder dergleichen Stoffen mittels Kreislaufmahlprozess
DE102011102677A1 (de) * 2011-05-28 2012-11-29 Khd Humboldt Wedag Gmbh Verfahren zum Erzeugen von Mikrorissen in Erzgestein
CN102553700A (zh) * 2011-07-06 2012-07-11 洛阳宇航重工机械有限公司 一种破碎氧化铝结壳块的斗提生产线装置和方法
DE102011088414A1 (de) * 2011-12-13 2013-06-13 Cerdur Ceramic GmbH Mahlverfahren und Mahlvorrichtung zur Herstellung von Nano-Mahlgut
EP2790837B1 (de) * 2011-12-16 2019-06-12 Holcim Technology Ltd. Zerkleinerungsvorrichtung und verfahren zur herstellung hydraulischer binder
US10012043B1 (en) * 2013-12-06 2018-07-03 Fsi Holdings, Llc Process and system for recovery of solids from a drilling fluid
CN108499714B (zh) * 2017-04-06 2020-04-14 徐前呈 一种连续式碓土方法
CN110523504A (zh) * 2019-08-21 2019-12-03 安徽金安矿业有限公司 一种闭路循环的二段磨矿方法
CN112264172A (zh) * 2020-09-24 2021-01-26 酒泉钢铁(集团)有限责任公司 一种低品位磁铁矿分级干磨干选生产铁精矿工艺
CN113634353A (zh) * 2021-07-31 2021-11-12 栾川鑫曙博远选矿有限公司 一种具有再磨机构的磨矿装置

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FR2344337A1 (fr) * 1976-03-19 1977-10-14 Alsthom Cgee Procede et installation pour le broyage de minerais par voie humide
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Publication number Publication date
US6042032A (en) 2000-03-28
AU2296797A (en) 1997-10-17
EP0888192A1 (de) 1999-01-07
WO1997035665A1 (fr) 1997-10-02
BR9708237A (pt) 1999-08-03
ZA972440B (en) 1998-07-27
DE69705034T2 (de) 2002-02-14
AU726956B2 (en) 2000-11-30
HRP970167A2 (en) 1998-04-30
CA2248249A1 (fr) 1997-10-02
NO984395L (no) 1998-11-19
NO984395D0 (no) 1998-09-21
FR2746329A1 (fr) 1997-09-26
ATE201616T1 (de) 2001-06-15
FR2746329B1 (fr) 1998-05-22
DE69705034D1 (de) 2001-07-05

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