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WO2009065176A1 - Séparation de matière particulaire - Google Patents

Séparation de matière particulaire Download PDF

Info

Publication number
WO2009065176A1
WO2009065176A1 PCT/AU2008/001724 AU2008001724W WO2009065176A1 WO 2009065176 A1 WO2009065176 A1 WO 2009065176A1 AU 2008001724 W AU2008001724 W AU 2008001724W WO 2009065176 A1 WO2009065176 A1 WO 2009065176A1
Authority
WO
WIPO (PCT)
Prior art keywords
support surface
separator
fluid
hood
fraction
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/AU2008/001724
Other languages
English (en)
Inventor
Mingwei Gao
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.)
Commonwealth Scientific and Industrial Research Organization CSIRO
Original Assignee
Commonwealth Scientific and Industrial Research Organization CSIRO
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 AU2007906373A external-priority patent/AU2007906373A0/en
Application filed by Commonwealth Scientific and Industrial Research Organization CSIRO filed Critical Commonwealth Scientific and Industrial Research Organization CSIRO
Publication of WO2009065176A1 publication Critical patent/WO2009065176A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • 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
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area

Definitions

  • the invention relates to separating particulate material and in particular to the dry separation of particulate material.
  • Particulate material can be separated by a variety of techniques which can be broadly classified as wet techniques and dry techniques.
  • Wet techniques use water as a medium to assist in the separation and are particular useful where water is required for subsequent processing.
  • water is a scarce resource at many mining and industrial sites and processes which are as effective and less dependant on water are preferred.
  • Dry separation is therefore increasingly becoming the preferred method of performing particle separation and such techniques generally involve agitating a bed of material to be separated to produce stratification of the bed of material. Separate fractions can then be removed from different heights of the material.
  • Another method involves using an air permeable table and supplying a quantity of air sufficient to fluidise the material. These tables receive a feed from the top of the table and discharge the fines from the upper end of the table and the coarse particles from the lower end of the table. These tables rely on a delicate balance between the incline of the table and the air flow rate and prove to be difficult to maintain in operation when the feed material changes. Hence, continuous removal of ore fines proves to be difficult.
  • UK Patent application number GB2221172 describes a different approach.
  • the document describes a gravitational separator having a housing 1 with an inclined perforated bottom underlying three perforated grids 13 which in turn underlie a series of vertical chutes 3.
  • feed material is fed onto an upper edge of the inclined perforated bottom and air is supplied via the perforated bottom in a quantity sufficient to fluidise the feed material.
  • Air is drawn upwardly through the grids and through the chutes to carry away a fine fraction of the feed material. The heavier fraction is removed via the lower edge of the inclined perforated bottom.
  • a separator for the dry separation of a particulate material including:
  • a fluid supply configured to supply fluid to the support surface, the surface permitting the flow of fluid therethrough to entrain a selected particle size fraction of the particulate material
  • a hood communicating with an extraction means to draw fluid and the entrained fraction from the support surface into the hood and (iv) an auxiliary fluid inlet intermediate to the support surface and the hood for the supply of fluid above the support surface.
  • the preferred fluid is air, but of course other fluids, such as nitrogen for example, could be supplied to the body of particulate material in other applications.
  • the hood may be fitted with a screen configured to selectively permit the selected particle size fraction to pass therethrough. Those particles which are entrained, but outside the allowed particle size range and unable to pass through the screen, return to the vicinity of the support surface and are processed with the remaining material.
  • the separator includes a vibrator operable to vibrate the support surface for improved separation efficiency.
  • the support surface may be part of a conveyor continuously supplying particulate material to a region under the hood.
  • the support surface is preferably inclined so that feed material received on an upper region of the support surface falls toward a lower region of the support surface, the selected particle size fraction being entrained in the fluid stream and removed leaving a remaining fraction in the lower region.
  • the inclination is at least 30° from horizontal to prevent fines retreating upwardly along the support surface.
  • the hood may be operably connected to a further separating means or a collection device such as a bag house or a cyclone.
  • the fluid and the entrained fraction may simply be discharged.
  • the selected fraction is of a particle size less than about 200 micron. More preferably, the selected fraction is of a particle size less than about 100 micron.
  • the separator is most advantageously deployed for separating iron ore.
  • Other applications envisioned include the removal of:
  • Figure 1 is a schematic cross sectional view of a portion of an embodiment of the present invention.
  • Figure 2 is a performance chart showing the particle size distribution for the product, fine fraction and course fraction.
  • Figures 3(a) to (d) illustrate the improvements in the composition of the iron ore after the removal of the fines.
  • the separator 10 includes an air permeable table 20 and a hood 30 with screen 50 spanning the hood 30.
  • the hood 30 is spaced from the support surface 20 leaving openings 100.
  • a vibrator 90 (shown only in schematic form) is operably connected to the support surface 20.
  • An extraction fan (not shown) may be arranged to extract air and the selected fraction 70 through hood 30 as indicated by arrow B.
  • a pressurised air supply (not shown) provides an upward air flow from under the support surface 20 as indicated by arrows A.
  • feed material 60 is supplied to the separator 10 toward the upper edge of support surface 20.
  • the support surface is inclined by an angle a to the horizontal such that the feed material tends to flow downwardly across the support surface 20.
  • the magnitude and character of the vibration from vibrator 90 and the volume of airflow from the air supply A is selected to optimally fluidise the feed material and entrain a selected fraction of the material.
  • the amount of airflow B is selected to be greater than the air supplied from A such that the entrained faction 110 is more effectively upwardly drawn towards the screen 50.
  • the difference in airflows is made up by inwardly flowing airstreams C, which flow through openings 100 that are provided by the spacing of hood 30 from the support surface 20. This effectively creates a negative pressure within the hood.
  • air entering through C effectively works as a barrier or seal maximising the amount of particulate material entrained in B.
  • the airflows are selected to optimally fluidise the bed of material and entrain a fraction of material smaller than 100 microns.
  • the airflow B is selected to more effectively draw the less than 100 micron fraction 70 of the material upwardly.
  • the screen 50 has an aperture size of 100 microns such that larger particles included in the entrained fraction 110 are prevented from passing through. In this way, there is a more efficient separation of the particles.
  • vibrator 90 in addition to air supply A enables better separation efficiency by producing a more dilated and less dense fluidised particle bed, which can be optimised according to the feed particle size by changing airflow A, the vibration frequency, the vibration amplitude and the character of the bed.
  • the more dilated particle bed also leads to a higher throughput.
  • a disadvantage of the use of vibration is the tendency of fine material to move upwardly along the support surface 20 due to particle-to-particle interaction. This is substantially overcome by inclining the support surface 20 at an angle a that is 30 degrees or more to the horizontal. In this embodiment the angle a is 30 degrees.
  • iron ore having a specific gravity of 4.2 was fed into a prototype of the invention with a capacity of 600 kg/hr/m 2 .
  • the support surface was 0.3 x 0.6 metres in size and had a 0.5 mm rectangular slots and the hood was fitted with a mesh screen having a 0.1 mm aperture size.
  • Figure 2 illustrates the composition of the feed and the separated coarse and fine fractions.
  • the graph illustrates the weight percentage (Y-axis) of particles in the respective streams that are less than a particular particle size (X-axis). It can be seen that 22 wt% of the particles in the feed were less than 100 microns in size.
  • the course product stream, ie, the stream exiting the support surface at 80 in Figure 1 contained only 2 wt% of particles less than 100 microns in size
  • the fine product stream, ie, stream 70 in Figure 1 contained 75 wt% of particles less than 100 microns in size.
  • screen 50 in Figure 1 was not present.
  • the fine product stream consisted of 28 wt% of the feed stream, whereas the course stream consisted of 72 wt% of the feed stream.
  • the results also show that all of the fines fraction was less than about 300 microns.
  • the separator provides precise control over the separation and was able to remove a substantial amount of the fine particles less than 100 microns from the feed stream.
  • the coarse product was then analysed for Fe, Si ⁇ 2 , AI 2 O 3 and P content and compared with the respective contents of the feed material before separation. It can be seen that not only are there improvements in the Fe content of the ore after treatment for the size fractions removed, but also the levels of the impurities AI 2 O 3 , SiO 2 and P are also reduced. This is related to the differing densities of the ore containing fine particles relative to the impurity containing particles and the greater proportion of impurities present in the fine ore fractions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

La présente invention se rapporte à un séparateur destiné à la séparation sèche d'une matière particulaire comprenant : (i) une surface de support perméable aux fluides destinée à soutenir un corps de matière particulaire ; (ii) une alimentation en fluide conçue pour acheminer un fluide vers la surface de support, la surface permettant au fluide s'écoulant à travers elle d'entraîner une fraction à taille de particule sélectionnée de la matière particulaire ; (iii) une hotte communiquant avec des moyens d'extraction pour retirer le fluide et la fraction entraînée depuis la surface de support jusque dans la hotte et (iv) une arrivée de fluide auxiliaire située entre la surface de support et la hotte pour l'acheminement de fluide au-dessus de la surface de support.
PCT/AU2008/001724 2007-11-21 2008-11-21 Séparation de matière particulaire Ceased WO2009065176A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007906373A AU2007906373A0 (en) 2007-11-21 Particulate material separation
AU2007906373 2007-11-21

Publications (1)

Publication Number Publication Date
WO2009065176A1 true WO2009065176A1 (fr) 2009-05-28

Family

ID=40667053

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/001724 Ceased WO2009065176A1 (fr) 2007-11-21 2008-11-21 Séparation de matière particulaire

Country Status (1)

Country Link
WO (1) WO2009065176A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012150355A1 (fr) * 2011-05-05 2012-11-08 Cnh France Procédé et système pour éliminer un résidu à partir d'un écoulement de récolte
CN112588587A (zh) * 2020-11-28 2021-04-02 颍上县隆原米业有限责任公司 一种用于大米加工设备的除尘净化系统及其方法
WO2021242737A1 (fr) * 2020-05-27 2021-12-02 Hatchery Planning, Inc. Dispositif séparateur pour la séparation de débris par rapport à des poussins nouvellement éclos

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804250A (en) * 1970-04-29 1974-04-16 Buehler Ag Geb Stratifier with discharge means for maintaining stratified layers
SU459272A1 (ru) * 1973-06-13 1975-02-05 Украинский научно-исследовательский и проектно-конструкторский институт по обогащению и брикетированию углей Способ грохочени материалов
US4565326A (en) * 1984-12-14 1986-01-21 E. R. Squibb & Sons, Inc. Method and apparatus for removing veneer from reworked medicine tablets
US5148921A (en) * 1988-07-08 1992-09-22 Gbe International Plc Pneumatic separation of particulate material
WO1997004886A1 (fr) * 1995-07-28 1997-02-13 Kenneth I Savage Separation de particules par voie seche
DE19717514A1 (de) * 1997-04-25 1998-10-29 Peter Dieckmann Verfahren und Vorrichtung zur Aufbereitung von getrockneten Kräutern

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804250A (en) * 1970-04-29 1974-04-16 Buehler Ag Geb Stratifier with discharge means for maintaining stratified layers
SU459272A1 (ru) * 1973-06-13 1975-02-05 Украинский научно-исследовательский и проектно-конструкторский институт по обогащению и брикетированию углей Способ грохочени материалов
US4565326A (en) * 1984-12-14 1986-01-21 E. R. Squibb & Sons, Inc. Method and apparatus for removing veneer from reworked medicine tablets
US5148921A (en) * 1988-07-08 1992-09-22 Gbe International Plc Pneumatic separation of particulate material
WO1997004886A1 (fr) * 1995-07-28 1997-02-13 Kenneth I Savage Separation de particules par voie seche
DE19717514A1 (de) * 1997-04-25 1998-10-29 Peter Dieckmann Verfahren und Vorrichtung zur Aufbereitung von getrockneten Kräutern

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class P43, AN 1975-K9570W *
DATABASE WPI Derwent World Patents Index; Class P43, AN 1998-569690 *
DATABASE WPI Week 199717, Derwent World Patents Index; Class P43, AN 1997-181332 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012150355A1 (fr) * 2011-05-05 2012-11-08 Cnh France Procédé et système pour éliminer un résidu à partir d'un écoulement de récolte
FR2974705A1 (fr) * 2011-05-05 2012-11-09 Cnh France Sa Procede et systeme d’elimination des dechets d’un flux de recolte
US9579692B2 (en) 2011-05-05 2017-02-28 Cnh Industrial America Llc System for eliminating residue from a flow of harvest
WO2021242737A1 (fr) * 2020-05-27 2021-12-02 Hatchery Planning, Inc. Dispositif séparateur pour la séparation de débris par rapport à des poussins nouvellement éclos
CN112588587A (zh) * 2020-11-28 2021-04-02 颍上县隆原米业有限责任公司 一种用于大米加工设备的除尘净化系统及其方法

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