EP0888192A1 - Method and apparatus for simultaneously and continuously producing a plurality of size fractions of a mineral material - Google Patents
Method and apparatus for simultaneously and continuously producing a plurality of size fractions of a mineral materialInfo
- Publication number
- EP0888192A1 EP0888192A1 EP97915524A EP97915524A EP0888192A1 EP 0888192 A1 EP0888192 A1 EP 0888192A1 EP 97915524 A EP97915524 A EP 97915524A EP 97915524 A EP97915524 A EP 97915524A EP 0888192 A1 EP0888192 A1 EP 0888192A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grains
- fraction
- fractions
- dimensions
- upper limit
- 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.)
- Granted
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
- B02C23/14—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 process and a continuous operation installation for reducing a mineral material into grains of different sizes and dividing the ground product into several particle size fractions each consisting of grains whose dimensions are between an upper limit and a limit. lower predetermined
- the object of the invention is to allow the simultaneous production of several fractions of different particle size, from a fraction whose grains have a size of up to several tens of mm to a fraction whose grains have dimensions of the order of micron to a few hundred microns, using a single fragmentation device and classification devices
- the process which is the subject of the invention is characterized in that, starting from a crude product in pieces, said pieces having, for example, dimensions less than or at most equal to 150 mm, they are subjected to crushing by layer crushing of material, the ground products are divided into several fractions comprising at least one coarse fraction, the grains of which have a size comprised, for example between 0.5 mm and several tens of mm and a fine fraction having an upper limit ranging, for example from 300 ⁇ m to a few tens of ⁇ m, by selecting, optionally, the parameters of the grinding operation so that, for all the fractions, the flow rate produced is greater than or at least equal to the desired flow rate, and the grains whose dimensions are greater than the upper limit of the coarse fraction and possibly all or part of the fractions whose grains have dimensions between the lower limit of the coarse fraction and the upper limit of the fine fraction
- the fine and coarse fractions can thus be directly exploited after a single grinding step.
- the intermediate fraction it can also be subdivided.
- the advantage of crushing by crushing in a layer of material is that it makes it possible to achieve, in a single fragmentation step, the production of a mixture having a broad particle size spectrum and also containing large grains (for example 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 a sufficient pressure to cause the fragmentation of the grains which are reduced to smaller grains.
- the implementation of these processes are grinders with grinding wheels, vertical ball or roller mills, ring mills, cylinder presses and vibrating cone mills
- the invention also relates to an installation for setting using the method described above, characterized in that it comprises a grinder performing grinding in a layer of material and at least two classification apparatuses, one of these apparatuses being capable of separating products coming from the grinder those whose size grains is greater than the upper limit of the coarse fraction, which are returned to the inlet of the mill, and the other classification apparatus being capable of separating from the ground products the grains constituting the fine fraction
- a product dry one of the classification devices will be a screen and the other may be a pneumatic separator
- one of the devices may be a screen or a hydraulic classification device and the other could be a hydrocyclone
- FIG. 1 shows a simplified installation consisting essentially of a crusher 10, a pneumatic separator 12 and a screen 14.
- the crusher is, for example, a ring crusher of the type described in French patents Nos. 90 14004 and 91 09788 It consists of a drum with a substantially horizontal axis inside which an annular track is arranged on which a roller, whose axis is parallel to that of the drum, is pressed by springs or jacks
- the material to be ground M is introduced into the drum which rotates at a sufficiently high speed (speed greater than the critical speed) so that the material forms over the entire track a layer on which the roller rolls.
- the ground products are evacuated and brought to the separator 12 by a current of air or other gas flowing through the drum
- the separator 12 is of the type described in French patent n ° 90 01673 II comprises a rotor with vertical axis provided with blades on its periphery and surrounded by vertical vanes, fixed but adjustable Le charge air flow of the ground product is admitted into the separator housing from below, passes through the crown of blades from the outside to the inside, then enters the rotor and is finally discharged through a central opening in the rotor.
- the dimensions are greater than a predetermined dimension (cutting mesh) are thrown by centrifugal force against the blades and fall into the lower part of the casing from where they are discharged by an outlet 16 Particles whose dimensions are less than the mesh are cut by the air flow inside the rotor and evacuated with it by an outlet 17
- their dimensions can vary, for example, from 1 ⁇ m to 100 ⁇ m
- the products discharged through the outlet 16 of the separator 12 feed the screen 14 This is equipped with two fabrics or grids making it possible to divide the products coming from the separator 12 into three fractions the refusals constituted by 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 between, for example, between 1 and 10 mm, and an average fraction F2 whose dimensions are between 0.1 and 1 mm
- the installation makes it possible to simultaneously produce six different particle size fractions. It is constituted by a vibrating cone crusher 18 of the type described in French patents n ° 93 03375 and n c 95 06964 in the name of applicant
- the raw product is brought in by a conveyor 20 which feeds the crusher through a dividing member 22 allowing a part of the crude product to short-circuit the crusher
- the ground product as well as the fraction of the crude product bypassing the crusher are brought by an elevator 24 on a screen 26 has two fabrics or grids
- the rejects of the screen are returned to the feed to the crusher by means of a conveyor 28
- the 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 the figure 1
- the fraction with particle size intermediate is stored in a silo 32
- the screen rejects may consist of 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 of 5 at 15 mm, from 1.5 to 5 mm and from 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 siios 46 and 48
- the silos 32, 38, 40, 42 and 46 are each provided with an overflow which feeds the conveyor 28 making it possible to return the excess production compared to the needs of the different particle size fractions when the silos have to working at a constant level, a lateral purge system with controlled extraction placed at the bottom of the silo makes it possible to evacuate the excess production of each fraction and to ensure level regulation The surpluses of each fraction are, in this case too, recycled to the mill feed.
- the storage silo for the ultra-fine fraction 48 does not have an overflow or a purge system and a level regulator stops the installation when the level of the products reaches an upper limit
- a regulation system makes it possible to maintain the total flow rate passing through the mill at a predefined value by acting on the feed rate of raw product.
- This system may include a hopper of feeding the mill maintained at constant level or weight or means for measuring the total flow recycled to the mill supply
- the adjustment of the parameters determining the operating conditions of the crusher - opening of the frequency of vibrations, fragmentation force output and the adjustment of the flow rate of the raw product bypassing the crusher make it possible to optimize the particle size distribution of the mixture of crushed product. - raw product feeding the screen 26, so as to minimize the throughput of recycled products at the inlet of the mill
- FIG. 3 illustrates an application of the invention to the preparation of coke fractions for the manufacture of anodes used for the production of aluminum by electrolysis it allows to produce four coke fractions of different particle sizes
- This installation differs from that of FIG. 2 only by the removal of the second air separator 34 and the use, in place of the screen 26, of a screen 26 'with a single canvas or grid.
- the crusher 54 is a ring crusher of the type described above with reference to FIG. 1
- the crusher feeds, by means of a 24 "bucket elevator, a 26" screen whose rejects are brought back to the entry of the mill by a conveyor belt 28 "The passer of the screen feeds a pneumatic separator 30"
- the fine fraction extracted pneumatically from the separator 30 is freed of dust (ultra-fine fractions) in a second pneumatic separator 34 "this ultra-fine fraction is separated from the air stream by means of a filter 44" and stored in a 48 “silo while the fine fraction (refusal of the 34" separator) is stored in a
- the intermediate fraction is stored in a 32" silo and the fraction with a lower particle size, which has passed through the two screens 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 10 mm mesh screen, the screen 56 with two 1 and 2 mm mesh screens and the screen 58 with two fabrics with 0.3 and 0.5 mm mesh 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
- the silos with the exception of the 48 "silo, are fitted with an overflow allowing the surplus production of each slice to be returned to the crusher by means of the 28" conveyor.
- a system for regulating the feed rate of the mill allows it to be adapted to requirements.
- the adjustment of the parameters of the mill - force applied to the roller, residence time - makes it possible to optimize the particle size distribution of the milled product so that '' It meets the needs Unlike the installations described above which work on dry materials, the installation, the diagram of which is given in Figure 5, allows wet materials to be treated.
- It includes a crusher 60, for example a vibrating cone crusher , working in the wet, a screen with two grids 62, two hydrocyclones 64 and 66 and a hydraulic classifier 68, pipes connect these devices to each other and pumps ensure the circulation of products
- the crude product M is brought to the inlet of the crusher in the form of pulp or in pieces, in the latter case water is added to the crude product in the crusher
- the ground product is brought to the screen 62
- the rejection of the screen is returned to the feed to the crusher
- the product having passed through the two grids of the screen is sent to the inlet of the hydrocyclone 64
- the fraction of the product formed of 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 portion can be returned to the feed of the mill 60
- hydrocyclone 64 feeds the hydraulic classifier 68, while its overflow is sent to the inlet of hydrocyclone 66
- the overflow and underflow of hydrocyclone 66 constitute two fine fractions G3 and F3 'which are subjected, separately to filtration or to decantation to remove the water which is recycled.
- the overflow of hydrocyclone 66 can optionally be treated with by means of a centrifuge 70 giving two ultra-fine fractions F4 and F4 '
- the underflow of the hydrocyclone 64 is divided into two intermediate fractions F2 and F2 'which are also subjected to filtration to remove the water. A part of the underflow of the classifier 68 can however be returned to the feed to the crusher 60
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
- Combined Means For Separation Of Solids (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Fertilizers (AREA)
- Seasonings (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Glanulating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9603577 | 1996-03-22 | ||
FR9603577A FR2746329B1 (en) | 1996-03-22 | 1996-03-22 | PROCESS AND PLANT FOR THE SIMULTANEOUS AND CONTINUOUS PRODUCTION OF SEVERAL GRANULOMETRIC FRACTIONS OF A MINERAL MATERIAL |
PCT/FR1997/000492 WO1997035665A1 (en) | 1996-03-22 | 1997-03-20 | Method and apparatus for simultaneously and continuously producing a plurality of size fractions of a mineral material |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0888192A1 true EP0888192A1 (en) | 1999-01-07 |
EP0888192B1 EP0888192B1 (en) | 2001-05-30 |
Family
ID=9490438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97915524A Revoked EP0888192B1 (en) | 1996-03-22 | 1997-03-20 | Method and apparatus for simultaneously and continuously producing a plurality of size fractions of a mineral material |
Country Status (12)
Country | Link |
---|---|
US (1) | US6042032A (en) |
EP (1) | EP0888192B1 (en) |
AT (1) | ATE201616T1 (en) |
AU (1) | AU726956B2 (en) |
BR (1) | BR9708237A (en) |
CA (1) | CA2248249A1 (en) |
DE (1) | DE69705034T2 (en) |
FR (1) | FR2746329B1 (en) |
HR (1) | HRP970167A2 (en) |
NO (1) | NO984395L (en) |
WO (1) | WO1997035665A1 (en) |
ZA (1) | ZA972440B (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2759610B1 (en) * | 1997-02-19 | 1999-04-16 | Fcb | METHOD AND INSTALLATION FOR REDUCING CRUDE MATERIAL INTO PIECES TO GRAIN MATERIAL ACCORDING TO A GIVEN GRANULOMETRIC DISTRIBUTION |
ID30297A (en) * | 2000-05-17 | 2001-11-22 | Asahi Glass Co Ltd | METHOD FOR PROCESSING A GAS |
CA2344511A1 (en) | 2001-04-19 | 2002-10-19 | First American Scientific Corp. | Method of recovery of precious metals and heavy minerals |
DE102010033628A1 (en) * | 2010-07-02 | 2012-01-05 | Akw Apparate + Verfahren Gmbh | Process for the wet treatment of materials, in particular ores or similar substances by Kreislaufmahlprozess |
DE102011102677A1 (en) * | 2011-05-28 | 2012-11-29 | Khd Humboldt Wedag Gmbh | Method of producing microcracks in ore |
CN102553700A (en) * | 2011-07-06 | 2012-07-11 | 洛阳宇航重工机械有限公司 | Bucket production line device and method for crushing aluminum oxide crusting blocks |
DE102011088414A1 (en) * | 2011-12-13 | 2013-06-13 | Cerdur Ceramic GmbH | Grinding method for producing nano-grinding material from input material e.g. fireclay, involves continuously grinding input materials into powder having grains in nanometer range, and discharging ground material by duct |
JP2015501720A (en) * | 2011-12-16 | 2015-01-19 | ラファルジュ | Crushing method, crushing equipment and related hydraulic binder manufacturing method |
US10012043B1 (en) * | 2013-12-06 | 2018-07-03 | Fsi Holdings, Llc | Process and system for recovery of solids from a drilling fluid |
CN106861876B (en) * | 2017-04-06 | 2018-09-21 | 徐前呈 | Even it is unearthed automatically electric treadle-operated tilt hammer for hulling rice and its treadle-operated tilt hammer for hulling rice indigenous method after formula |
CN110523504A (en) * | 2019-08-21 | 2019-12-03 | 安徽金安矿业有限公司 | A kind of secondary grinding method of closed cycle |
CN112264172A (en) * | 2020-09-24 | 2021-01-26 | 酒泉钢铁(集团)有限责任公司 | Process for producing iron ore concentrate by grading, dry grinding and dry separation of low-grade magnetite |
CN113634353A (en) * | 2021-07-31 | 2021-11-12 | 栾川鑫曙博远选矿有限公司 | Ore grinding device with regrinding mechanism |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2072063A (en) * | 1933-09-30 | 1937-02-23 | Vanderbilt Co R T | Manufacture of pyrophyllite |
US2461089A (en) * | 1944-06-22 | 1949-02-08 | Smidth Leonard | Process of forming granulated synthetic resin compositions |
US2554450A (en) * | 1946-07-12 | 1951-05-22 | Agrashell Inc | Fire-avoiding grinding and classifying system and process |
DE1194230B (en) * | 1961-03-07 | 1965-06-03 | Westfalia Dinnendahl Groeppel | Method of grinding and sifting |
FR2344337A1 (en) * | 1976-03-19 | 1977-10-14 | Alsthom Cgee | Wet crushing process for ore - has fines treated in separators with water cleaning and recycling for coarse crushing |
DE3126871A1 (en) * | 1981-07-08 | 1983-01-27 | Steag Ag, 4300 Essen | Process for the grinding of coal containing non-combustible constituents and apparatus for carrying out the process |
FI851608L (en) * | 1984-04-30 | 1985-10-31 | Gen Mining Union Corp | FOERFARANDE OCH ANORDNING FOER BEHANDLING AV MALM. |
DE3418197A1 (en) * | 1984-05-16 | 1985-11-21 | Krupp Polysius Ag, 4720 Beckum | GRINDING METHOD AND MILLING PLANT |
EP0328516A1 (en) * | 1986-09-10 | 1989-08-23 | Larox Oy | Method and equipment for the production of particularly finely divided dry powders |
DE3921823A1 (en) * | 1989-07-03 | 1991-01-17 | Krupp Polysius Ag | METHOD AND APPARATUS FOR MINING GRINDING |
IT1248066B (en) * | 1991-06-17 | 1995-01-05 | Italcementi Spa | DYNAMIC SEPARATOR FOR POWDERED MATERIALS, IN PARTICULAR CEMENT AND PLANT THAT INCLUDES IT |
US5379948A (en) * | 1994-01-06 | 1995-01-10 | American Colloid Company | Method for milling clay without substantial generation of powder |
-
1996
- 1996-03-22 FR FR9603577A patent/FR2746329B1/en not_active Expired - Fee Related
-
1997
- 1997-03-20 CA CA002248249A patent/CA2248249A1/en not_active Abandoned
- 1997-03-20 BR BR9708237A patent/BR9708237A/en not_active Application Discontinuation
- 1997-03-20 US US09/155,130 patent/US6042032A/en not_active Expired - Fee Related
- 1997-03-20 DE DE69705034T patent/DE69705034T2/en not_active Revoked
- 1997-03-20 EP EP97915524A patent/EP0888192B1/en not_active Revoked
- 1997-03-20 ZA ZA972440A patent/ZA972440B/en unknown
- 1997-03-20 WO PCT/FR1997/000492 patent/WO1997035665A1/en not_active Application Discontinuation
- 1997-03-20 AT AT97915524T patent/ATE201616T1/en not_active IP Right Cessation
- 1997-03-20 AU AU22967/97A patent/AU726956B2/en not_active Ceased
- 1997-03-21 HR HR9603577A patent/HRP970167A2/en not_active Application Discontinuation
-
1998
- 1998-09-21 NO NO984395A patent/NO984395L/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9735665A1 * |
Also Published As
Publication number | Publication date |
---|---|
NO984395D0 (en) | 1998-09-21 |
ATE201616T1 (en) | 2001-06-15 |
FR2746329B1 (en) | 1998-05-22 |
EP0888192B1 (en) | 2001-05-30 |
HRP970167A2 (en) | 1998-04-30 |
NO984395L (en) | 1998-11-19 |
AU2296797A (en) | 1997-10-17 |
AU726956B2 (en) | 2000-11-30 |
WO1997035665A1 (en) | 1997-10-02 |
FR2746329A1 (en) | 1997-09-26 |
DE69705034D1 (en) | 2001-07-05 |
US6042032A (en) | 2000-03-28 |
DE69705034T2 (en) | 2002-02-14 |
ZA972440B (en) | 1998-07-27 |
CA2248249A1 (en) | 1997-10-02 |
BR9708237A (en) | 1999-08-03 |
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