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WO2011041828A1 - Séparation pneumatique de matières en vrac - Google Patents

Séparation pneumatique de matières en vrac Download PDF

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Publication number
WO2011041828A1
WO2011041828A1 PCT/AU2010/001303 AU2010001303W WO2011041828A1 WO 2011041828 A1 WO2011041828 A1 WO 2011041828A1 AU 2010001303 W AU2010001303 W AU 2010001303W WO 2011041828 A1 WO2011041828 A1 WO 2011041828A1
Authority
WO
WIPO (PCT)
Prior art keywords
conveyor
nozzle assembly
suction
loose
blower
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/AU2010/001303
Other languages
English (en)
Inventor
Aleksandr Vladimirovic Kuzmin
Andrey Vladimirovich Kallna
Grigory Nikolaevich Tabakov
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.)
DS TECHNOLOGY
Original Assignee
DS TECHNOLOGY
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
Priority claimed from AU2009904830A external-priority patent/AU2009904830A0/en
Application filed by DS TECHNOLOGY filed Critical DS TECHNOLOGY
Publication of WO2011041828A1 publication Critical patent/WO2011041828A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • 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
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents

Definitions

  • THIS INVENTION relates to a pneumatic separation of loose materials.
  • the invention has particular application to a method of and apparatus for dry pneumatic separation of rnulti.-component loose materials, such as coal and/or other ores.
  • the invention is not linnted to this field of use and may be used in other fields where loose, predominantly solid materials of different compositions or properties arc in a mixed state and require separation from one another.
  • Dry beneficiation of coal in a fluidized bed is sometimes used as an alternative to- washing, particularly where water supply and/or wastewater disposal is a problem.
  • Pneumatic separation has been disclosed by Falenko, T. G. , Butovitskiy, V. 3., Pogartseva, E. M. in ⁇ 'Technology of coal beneficiation: the Handbook" — 2 nd edition, published by Nedra, Moscow, 1985 ⁇ pages 93-96 and 136-144 and Tsiperovich, M. V. in "Equipment for coal washing plants” published by "Metaliurgizdat", Sverdlovsk, 1958 - pages 213-238.
  • Russian Patent Specification No. 2,282,503 discloses a method of beneficiabion of coal which is more efficient than previous systems, and discloses a method including the steps of preliminary crushing, selective grinding and classifying material in three stages by provision of a series of three suction nozzle ' s above the material on a conveyer.
  • a first suction nozzle is spaced from the conveyor belt at a maximum distance; a second suction nozzle mounted at leaser distance from the belt as compared with first nozzle and a third nozzle is mounted at a minimum distance from belt.
  • the aforementioned Russian Patent discloses details of a mesh conveyor with three suction nozzles installed above it.
  • material having a density over 1, 800 to 2 500 kg m "5 remains on the mesh conveyor and is dumped to a reject bunker for further disposal.
  • This method therefore does not allow separation of materials with density over 2, 500 kg m -3 .
  • There is also a limit to the clearance of nozzles above the mesh conveyor due to possibility that the nozzles can obstruct and/or be struck by the material on the conveyor.
  • the present invention aims to provide a method of and apparatus for pneumatic separation of materials which alleviatesthe shortcomings of the prior art. Other aims and advantages of the invention may become apparent from the following description.
  • the present invention in one aspect resides broadly in apparatus for pneumatic separation of loose materials including:
  • a mesh conveyor for conveying the loose materials across a separation zone
  • blower nozzle assembly operatively aligned beneath the mesh conveyor and operable to blow gaseous medium in a predominantly upward direction through the mesh conveyor and the loose materials thereon;
  • suction nozzle assembly operatively aligned above the mesh conveyor and in substantial alignment with the blower nozzle assembly, the suction nozzle assembly being operable to generate suction predominantly above the loose material and thereby receive the gaseous medium and a portion of the loose material entrained therein?
  • each nozzle assembly is formed to provide an elongate fluidizaLion area in the direction of travel of the conveyor through separation, zone.
  • the present invention resides broadly in a method of pneumat cally separating loose materials including: conveying the loose materials on mesh conveyor across a separation zone;
  • nozzle assembly operatively aligned beneath the mesh conveyor through the mesh conveyor and the loose materials thereon;
  • blower and suction nozzles are preferably aligned with their respective axes intersecting the axis of the direction of travel of the conveyor (the ⁇ conveyor axis") .
  • blower nozzles and suction nozzles form a set of blower and suction nozzles.
  • Each set of nozzles therefore provides an elongate fluidization area through which the material on the conveyor passes.
  • the benefit of the elongate fluidization area is that the material is subject to the fluidization for an extended period under particular, entrainment conditions to thereby fractionate the particles by virtue of their respective entrainment properties.
  • the conveyor is arranged to convey the loose material substantially horizontally, but it will be appreciated that the conveyor may be arranged to convey the loose material up or down an incline small enough that the neither fluidization of the loose material nor bulk flow of the material along the conveyor are substantially adversely affected.
  • blower and suction nozzle sets spaced along the conveyer axis.
  • the flow rate of the gaseous medium is increased for each nozzle set downstream from the previous one.
  • the first set may be operated at a .flow rate to entrain loose material with a density of from 1,350 to 1, 600 kg m -3 .
  • the loose material remaining on the conveyor may then be conveyed to pass between the second set of blower and suction nozzles which may be operated at a flow rate to entrain loose material with a density of from 2, 500 to 5,000 kg m "3 .
  • the loose material remaining on the conveyor may then be conveyed to pass between the third set of blower and suction nozzles which may be operated at a flow rate to entrain loose material with a density of from 4,000 to 5, 000 kg m "3 .
  • the gaseous medium is preferably air.
  • a preferred method includes preliminary screening at class +0-100 mm, crushing selected oversize materials down to +0-100 ram and processing on .the pneumatic classifier or on vibrating screen with separation of underslze +0-1 mm material and sizing +1-300 mm raar.er al on sieves into classes with subsequent mesh sizes ratio equal to ..1,7 ⁇ * ⁇ 2.0 to divide the material .into classes having coarsest to finest particles ratio no more than 1.7 - 2.0.
  • a further preferred method includes feeding material of each class onto a mesh conveyor, with three sets of paired blowing nozzles installed underneath the mesh ' conveyor and aligned opposite paired suction nozzles installed above the mesh conveyor. Preferably, there are screens disposed between each set of nozzles.
  • the method of dry pneumatic separation of the multi- component loose materials further includes providing an increasing entrainrnent force on the particles between each successive set of nozzles by installing the first set of nozzles at a selected disLance from the mesh conveyor and installing each subsequent set of nozzles at a closer distance from the mesh conveyor.
  • the material ' coming through areas in between the sets of paired nozzles is separated on fractions with different densities.
  • the material with ' lower densities is sucked into the first set of nozzles, then the material with higher densities is sucked into the second set of nozzles and the material with oven higher densities .i s sucked up into the third set of nozzles, while the material with highest densities is left on the mesh conveyor.
  • the pneumatic separation of the multi-component loose materials could be also controlled by providing variable speed drives for the fan motors and adjustment ' of the speed drives to adjust the suction and blowing power of each set of nozzles.
  • the present invention resides broadly in a system for dry pneumatic separation of the multi-component loose materials including:
  • screening means for removing +100mm oversize material; crushing means for selective crushing oversize material down to 0 - 100 mm size;
  • size sorting means for sorting material into classes having in each class the size of coarsest to the size of finest particles ratio no more than 1.7 - 2.0;
  • apparatus for dry pneumatic separation of the multn- component loose materials; material handling means for feeding, transporting and collection of, product material and reject material.
  • the apparatus for dry pneumatic separation- of the multi- component loose materials includes in a preferred form a mesh conveyor with feed . bunker and products/rejects bunkers; three sets of doubled blowing nozzles insbailed underneath the mesh conveyor and aligned opposite doubled suction nozzles installed above the mesh conveyor; screens between each pair of doubled nozzles; fans driven by motors with variable * speed drives; solid traps, air cyclones and air filters; control means to adjust distances between nozzles sets and mesh conveyor, the speed of mesh conveyor, speed of fans.
  • the flow rate of the gaseous medium may be selected to provide for recovering 60% of the recoverable material for each nozzle, whereupon the recovery of the recoverable material is 84%.
  • Fig. 1 is a schematic representation of pneumatic separation apparatus according to the invention
  • Fig. 2 is a schematic representation of a section of the pneumatic separation apparatus of Fig. 1 through line A-A.
  • the pneumatic separation apparatus 10 shown in Figs. 1 and 2 includes a conveyor 11 mounted for rotation about a drive roller -.31 and an idler roller 32 in the direction of arrow 33.
  • the conveyor is supported along the upper portion of its travel by four support rollers shown typically at 37, the support rollers being disposed beneath the conveyor with their upper extremities in substantial straight-line alignment with the upper extremities of the drive and idler rollers .
  • Loose material 34 is fed into a bunker 12 through its open top orifice.
  • the bunker includes trails which direct tho loose material onto the conveyor at a feed end 35.
  • a first blower assembly 16 is disposed below the conveyor and a corresponding first suction assembly 13 disposed above the first blower assembly spaced above the loose material.
  • a second blower assembly 17 is disposed below the conveyor and a corresponding second suction assembly 14 disposed above the second blower assembly spaced above the loose material, the second blower and suction assemblies being spaced downstream from the first blower and suction assemblies in the direction of travel of the loose material on the conveyor indicated by arrow 36.
  • a third blower assembly 18 is disposed below the conveyor and a corresponding firsL suction assembly 15 disposed above the third blower assembly spaced above the loose material spaced downstream from the first and second blower and suction assemblies.
  • the blowers blow air out from their nozzle orifices In the direction of arrows shown typically at 38.
  • the corresponding suction assemblies extract Lhe air from above the loose material on the conveyor, but by virtue of their disposition above the corresponding blower assemblies, the air generally proceeds as indicated by the arrows shown typically at 39.
  • a lower shield 40 is provided below the conveyor substantially sealing a pressure space 41 below the conveyor, in similar fashion, in order to avoid loss of suction at negative pressure produced by the suction assemblies, an upper shield 42 is provided above the conveyor substantially sealing a vacuum space 43 above the conveyor and the loose material being conveyed thereon.
  • the suction assemblies are operated to substantially match or exceed the blowing capacity of the blower assemblies in order to provide an advantage of substantially eliminating loss coal fines because any leakage of the system draws air into the system.
  • blower and suction assemblies each have substantially the same arrangement as that of the first set depicted in Fig. 2.
  • a blower unit 24 blows air into a distribution chamber 47 which distributes the air through two blower transfer passages 48, each, one being in fluid communication with one of the pair of blower nozzles.
  • a suction unit 21 extracts air from a reception chamber 49 which receives the air through two suction transfer passages 50, each one being in 'fluid communication with one of the pair of suction nozzles.
  • a solid trap 9 and a cyclone 20 are interposed in the lluid path between the reception chamber and the suction unit.
  • a trap inlet duct 51 provides the fluid connection between the reception chamber and the solid trap.
  • a cyclone inlet duct 52 provides the fluid connection between the solids Lrap and the cyclone.
  • a suction unit inlet duct 53 provides the fluid connection between the cyclone and the suction unit. Extracted air is passed through an air filter 21 for discharge in the direction of arrows 54. Material caught by the filter is discharged as shown by arrow 55.
  • Beneficiated solids trapped by the solids trap are discharged through a discharge port of the solids- trap as indicated by arrow 56. Beneficiated fines are discharged through the discharge port of the cyclone as indicated by arrow 57.
  • the beneficiated solids and solids may be combined as shown at B or kept separate from one another if required.
  • Example 1 A sample of coal from "Bungursky” open, pit of Novokuznetsk area of Kemerovo region, Russia with initial ash content of 22.5% was comminuted to provide loose material for beneficiation.
  • the loose material was beneficiated in apparatus and by the method according to the present invention.
  • the loose material was beneficiated into a concentrate with ash content of 9%, middlings with ash content of 25% and ⁇ tailings with ash content 75% by the method according to the present invention.
  • Example 2 A sample of manganese ore of Durnovskoye deposit
  • Leninsk-Kuznetsk area of Kemerovo region, Russia with the initial grade of manganese of 8% was comminuted to provide loose material for beneficiation.
  • the loose material was beneficiated into a concentrate with the grade of 32% by the method according to the invention.
  • pneumatic separation apparatus could be used in coal, mining, building, chemical,. metallurgical industries.
  • the installation of blowing nozzles underneath the mesh conveyor aligned with suction nozzles opposed thereto improves the dry separation method by providing simultaneous blowing and suction force on material particles - Doubling each of nozzles at each stage of separation provides doubling of separation process.
  • Screens are installed between each set of blowing and suction nozzlea for creation of directional air flows, increasing air supercharge in the blowing nozzles and air discharge in the suction nozzles up to the pressure of 2,000 - 3000 ram water column. It is believed that the method and apparatus of the present invention provides separation of multi-component materials with the densities up to 4,000 - 5,000 kg m ⁇ 3 with greater recovery for each fraction.
  • the feed material is subject to preliminary screening to produce material, of a size (class) of +0-100 mm. Oversize material greater than 100 mm is subject Lo size reduction or comminution down to class +0-100 mm. Then the material is processed on a pneumatic classifier or on a vibrating screen with separation of class +0-1 mm. The material +1-100 mm is screened on a sieve with the subsequent mesh sizes ratio equal 1.7 - 2.0 to divided material into classes having coarsest to finest particles ratio no more than 1.7-2.0.
  • blowing nozzles 16, 17 and 18 increase the total speed of air passing through the loose material on the conveyor, and also allow the suction nozzles to be positioned with an operative clearance above the mesh, conveyor and substantially eliminate danger of collision of the loose material with mouths of suction nozzles.
  • the mesh conveyor could be supplied with additional one or two sets of nozzles.
  • air supercharge in the blowing nozzles 16, . 17 and 19 and air discharge in the suction nozzles 13, 14 and 15 is increased up to the rate of 2,000 - 3,000 mm water column.
  • Each fraction of the material (for example with density between 1,250 - 1,350 kg in" 3 is forced by the blowing nozzles 16 (Fig. 2) and simultaneously by the. suction nozzles 13.
  • the sucked up material then goes in the solid trap 19 where . the coarser particles drop out of a stream? the finer particles and a dust, formed during processing, settle in an air cyclone 20.
  • Products of separation of this fraction from ' solid trap 19, the air cyc ' lone 20 and the air filter 21 collected together (B) . If it is required the products from solid trap 19, the air cyclone 20 and Lhe air filter 21 could be discharged separately.
  • Air flow In nobles is provided by fans 23 and 24.
  • the proposed method provides separation of materials with the density up to 5,000 kg m -3 and the size of particles up to 100 mm with recovery of each fraction up to 84% » Those samples demonstrate' practicality of separation of multi-component 'loose materials by the proposed method.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

La présente invention se rapporte à un appareil destiné à la séparation pneumatique de matières en vrac comprenant : un transporteur à treillis destiné à transporter les matières en vrac sur une zone de séparation ; un ensemble buse de soufflage fonctionnellement aligné sous le transporteur à treillis et servant à souffler un agent gazeux dans une direction principalement ascendante à travers le transporteur à treillis et les matières en vrac se trouvant sur ce dernier ; un ensemble buse d'aspiration fonctionnellement aligné au-dessus du transporteur à treillis et sensiblement aligné sur l'ensemble buse de soufflage, l'ensemble buse d'aspiration servant à produire une aspiration principalement au-dessus des matières en vrac et à recevoir ainsi l'agent gazeux et une partie des matières en vrac entraînées dans ce dernier ; et un moyen de séparation fonctionnellement associé à l'ensemble buse d'aspiration, destiné à séparer les matières en vrac entraînées de l'agent gazeux.
PCT/AU2010/001303 2009-10-05 2010-10-05 Séparation pneumatique de matières en vrac Ceased WO2011041828A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2009904830A AU2009904830A0 (en) 2009-10-05 Pneumatic separation of loose materials
AU2009904830 2009-10-05

Publications (1)

Publication Number Publication Date
WO2011041828A1 true WO2011041828A1 (fr) 2011-04-14

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PCT/AU2010/001303 Ceased WO2011041828A1 (fr) 2009-10-05 2010-10-05 Séparation pneumatique de matières en vrac

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103263973A (zh) * 2013-05-14 2013-08-28 马钢(集团)控股有限公司 高含水高含粉块矿高效去粉方法及实现该去粉方法的装置
RU2659296C1 (ru) * 2017-05-04 2018-06-29 Общество с ограниченной ответственностью "ОФИС" Устройство пневматической сепарации, способ и установка сухого обогащения угля
CN109569874A (zh) * 2018-11-26 2019-04-05 天津美腾科技有限公司 动力煤分选系统、动力煤分选工艺及应用
WO2025061624A1 (fr) * 2023-09-18 2025-03-27 Grimme Landmaschinenfabrik Gmbh & Co. Kg Dispositif de séparation pour récoltes, en particulier pour récoltes de racines, et agencement de séparation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09266735A (ja) * 1996-03-29 1997-10-14 Isao Matsushita 小魚等の選別装置
JP2000153233A (ja) * 1998-11-20 2000-06-06 Shizuo Hikita 食品の夾雑物除去装置
RU2282503C1 (ru) * 2005-11-03 2006-08-27 Александр Владимирович Кузьмин Способ сухой переработки угля

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09266735A (ja) * 1996-03-29 1997-10-14 Isao Matsushita 小魚等の選別装置
JP2000153233A (ja) * 1998-11-20 2000-06-06 Shizuo Hikita 食品の夾雑物除去装置
RU2282503C1 (ru) * 2005-11-03 2006-08-27 Александр Владимирович Кузьмин Способ сухой переработки угля

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103263973A (zh) * 2013-05-14 2013-08-28 马钢(集团)控股有限公司 高含水高含粉块矿高效去粉方法及实现该去粉方法的装置
CN103263973B (zh) * 2013-05-14 2015-11-25 马钢(集团)控股有限公司 高含水高含粉块矿高效去粉方法及实现该去粉方法的装置
RU2659296C1 (ru) * 2017-05-04 2018-06-29 Общество с ограниченной ответственностью "ОФИС" Устройство пневматической сепарации, способ и установка сухого обогащения угля
CN109569874A (zh) * 2018-11-26 2019-04-05 天津美腾科技有限公司 动力煤分选系统、动力煤分选工艺及应用
WO2025061624A1 (fr) * 2023-09-18 2025-03-27 Grimme Landmaschinenfabrik Gmbh & Co. Kg Dispositif de séparation pour récoltes, en particulier pour récoltes de racines, et agencement de séparation

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