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WO2013160862A1 - Système de séparation - Google Patents

Système de séparation Download PDF

Info

Publication number
WO2013160862A1
WO2013160862A1 PCT/IB2013/053272 IB2013053272W WO2013160862A1 WO 2013160862 A1 WO2013160862 A1 WO 2013160862A1 IB 2013053272 W IB2013053272 W IB 2013053272W WO 2013160862 A1 WO2013160862 A1 WO 2013160862A1
Authority
WO
WIPO (PCT)
Prior art keywords
cloth
screening belt
apertures
roller
solid components
Prior art date
Application number
PCT/IB2013/053272
Other languages
English (en)
Inventor
David Neil MINSON
Rhett Charles McELVENNY
Original Assignee
Delkor Technik B.V.
Kotze, Gavin, Salomon
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 Delkor Technik B.V., Kotze, Gavin, Salomon filed Critical Delkor Technik B.V.
Publication of WO2013160862A1 publication Critical patent/WO2013160862A1/fr
Priority to ZA2014/03756A priority Critical patent/ZA201403756B/en

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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/10—Screens in the form of endless moving bands
    • 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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/52—Cleaning with brushes or scrapers
    • B07B1/522—Cleaning with brushes or scrapers with brushes

Definitions

  • THIS INVENTION relates to the separation of first solid particulate components from second solid particulate components having particle sizes which are generally smaller than that of the first solid components, where the first and second solid components are suspended in a liquid.
  • the Inventors are aware of separation systems which separate first solid particulate components from second solid particulate components having particle sizes which are smaller than that of the first solid components, where the first and second solid components are suspended in a liquid (e.g. tramp material mixed with a finely ground ore which are suspended in water; hereinafter referred to as the mixture).
  • a liquid e.g. tramp material mixed with a finely ground ore which are suspended in water; hereinafter referred to as the mixture.
  • One such system typically includes an endless screening belt or screening cloth which defines a plurality of apertures which apertures are of a suitable size to permit the second solid components to pass therethrough and to inhibit or impede the passage therethrough of the first solid components; a set of rollers around which the screening belt travels; and a drive unit which drives the screening belt around the set of rollers.
  • the path of the belt is such that it includes a generally horizontal separating region onto which the mixture can be introduced for separation.
  • a chute or "underpan” is usually positioned below the separating region in order to collect the liquid and second solid components which pass through the apertures.
  • An oversize chute is positioned at a discharge end of the separating region in order to collect the material that remains on the screening belt. In use, the mixture is introduced onto the horizontal separating region from the discharge end or from an end of the separating region opposite the discharge end.
  • first and second solid components Since the densities of the first and second solid components are usually greater than that of the liquid in which they are suspended, the components tend to sink down onto an operatively upper surface of the horizontal separating region. Some of the first solid components and larger second solid components may therefore end up clogging one or more of the apertures of the screening belt, thereby inhibiting the smaller second solid components, as well as the liquid, from passing through those apertures which, as a result, inhibits effective separation. The clogging may also result in some of the mixture eventually overflowing the sides of the belt in the separating region. This issue has been addressed in the past by installing overflow gutters that collect the overflow material and eventually channel it back to the feeding point where it is again discharged onto the separating region. This solution however causes spillage, loss of product or unwanted product recirculation loops, as well as general housekeeping or maintenance problems.
  • a separation system for separating first solid particulate components from second solid particulate components having particle sizes which are smaller than that of the first solid components, wherein the first and second solid components are suspended in a liquid to form a mixture or slurry, the system including:
  • an endless screening belt/cloth which is displaceable along a predetermined path and defining a separating region, the screening belt/cloth defining a plurality of apertures which apertures are of a suitable size to permit the second solid components to pass therethrough and to impede the passage therethrough of the first solid components;
  • a feed arrangement for feeding mixture onto the screening belt/cloth in the separating region; and at least one roller over which the screening belt/cloth extends in the separating region, the roller including a body which is rotatable about an axis of rotation and a plurality of protuberances which protrudes from the body, the protuberances being configured mechanically to engage with at least some of the apertures of the screening belt/cloth in order to break the surface tension of the mixture provided on the separating region of the screening belt/cloth when in use, thereby to facilitate the flow of the liquid and the passing of the second solid components through the apertures of the screening belt/cloth.
  • the roller In use, as the screening belt/cloth passes over the at least one roller, the roller rotates about its axis of rotation as a result of friction between the screening belt/cloth and the roller. As the roller rotates, some of its protuberances mechanically engage with the apertures of the screening belt/cloth as the screening belt/cloth passes over the roller and subsequently breaks the surface tension of the mixture at the apertures.
  • the protuberances may extend radially from the body.
  • the roller may be a roller brush and the protuberances may be in the form of bristles.
  • the roller may be positioned below the separating region and may be configured to engage an operatively lower side of the screening belt/cloth in the separating region.
  • the system may include two or more rollers which are spaced along a travel direction of the screening belt/cloth in the separating region.
  • the first and second solid components tend to settle on an operatively upper surface of the screening belt/cloth due to their density being greater than that of the liquid.
  • the larger first solid components may as a result clog one or more of the apertures, thereby inhibiting the second solid components, as well as the liquid, from passing through those apertures.
  • the protuberances may be of a suitable length to extend at least partially through the apertures during use, thereby to dislodge any of the first solid components which may be clogging the apertures.
  • the protuberances may be configured to increase the coefficient of friction between the roller and the screening belt/cloth, the protuberances therefore acting as a friction enhancing means.
  • a separation system for separating first solid particulate components from second solid particulate components having particle sizes which are smaller than that of the first solid components, wherein the first and second solid components are suspended in a liquid to form a mixture or slurry, the system including:
  • an endless screening belt/cloth which is displaceable along a predetermined path and defining a separating region, the screening belt/cloth defining a plurality of apertures which apertures are of a suitable size to permit the second solid components to pass therethrough and to impede the passage therethrough of the first solid components;
  • the roller being rotatable about an axis of rotation and having a friction enhancing means which is configured to increase the coefficient of friction between the roller and the screening belt/cloth.
  • the roller may include a body and the friction enhancing means may include irregularities on a surface of the body. More specifically, the body may be circular cylindrical and the irregularities may be provided on a radially outer surface of the body.
  • the friction enhancing means may include a plurality of protuberances which protuberances protrude from the body.
  • the protuberances may be configured mechanically to engage with at least some of the apertures of the screening belt/cloth in order to break the surface tension of the mixture provided in the separating region on the screening belt/cloth when in use, thereby to facilitate the flow of the liquid and the passing of the second solid components through the apertures of the screening belt/cloth.
  • the protuberances may extend radially from the body.
  • the protuberances may be in the form of bristles.
  • the roller may therefore be a roller brush.
  • the roller may be positioned below the separating region and be configured to engage an operatively lower side of the screening belt/cloth.
  • the system may include two or more rollers which are spaced along a travel direction of the screening belt/cloth. More specifically, the rollers may be positioned below the screen in the separating region and be configured to engage an operatively lower side of the screen.
  • a separation system for separating first solid particulate components from second solid particulate components having particle sizes which are smaller than that of the first solid components, wherein the first and second solid components are suspended in a liquid to form a mixture or slurry, the system including:
  • an endless screening belt/cloth which is displaceable along a predetermined path, the screening belt/cloth defining a plurality of apertures which apertures are of a suitable size to permit the second solid components to pass therethrough and to impede the passage therethrough of the first solid components;
  • the protrusion roller wherein one of the at least two rollers (hereinafter referred to as the protrusion roller) is positioned below the separating region and is configured to engage an operatively lower side of the screening belt/cloth in the separating region,
  • the protrusion roller including a body which is rotatable about an axis of rotation and a plurality of protuberances which protrudes from the body, the protuberances being configured mechanically to engage with at least some of the apertures of the screening belt/cloth in order to break the surface tension of the mixture provided on the screening belt/cloth when in use, thereby to facilitate the flow of the liquid and the passing of the second solid components through the apertures of the screening belt/cloth in the separating region; and
  • the other of the at least two rollers includes a body which is rotatable about an axis of rotation, the body having a friction enhancing means which is configured to increase the coefficient of friction between the roller and the screening belt/cloth.
  • the system may include two or more protrusion rollers and two or more friction rollers.
  • the or each roller may be an idler roller.
  • a method of separating first solid particulate components from second solid particulate components having particle sizes which are smaller than that of the first solid components, wherein the first and second solid components are suspended in a liquid to form a mixture or slurry the method including feeding the mixture onto an endless screening belt/cloth which is displaceable along a predetermined path, the screening belt/cloth defining a plurality of apertures which apertures are of a suitable size to permit the second solid components to pass therethrough and to impede the passage therethrough of the first solid components, the mixture being fed onto the screening belt/cloth in a separating region, the method further including breaking the surface tension of the mixture in the separating region at one or more of the apertures.
  • the breaking of the surface tension may be performed from an opposite side of the screening belt/cloth onto which the mixture is fed.
  • the method may include inserting protrusions into the apertures from the opposite side of the screening belt/cloth onto which the mixture is fed.
  • Figure 1 shows a schematic side view of a separation system in accordance with the invention
  • Figure 2 shows a three-dimensional view of a roller which forms part of the separation system of Figure 1 ;
  • Figure 3 shows a schematic side view of the roller of Figure 2;
  • FIG. 4 shows a schematic side view of another separation system in accordance with the invention.
  • Figure 5 shows a three-dimensional view of a roller which forms part of the separation system of Figure 4.
  • reference numeral 10 refers generally to a separation system in accordance with the invention.
  • the separation system 10 is specifically adapted for separating first solid particulate components from second solid particulate components which are mixed in a liquid (hereinafter referred to as the mixture 12), where the particle sizes of the second solid components are smaller than that of the first solid components.
  • the separation system 10 includes an endless screening cloth 14 (a screening belt can also be used) which defines a plurality of apertures 1 6 which apertures are of a suitable size to permit the second solid components and liquid to pass therethrough and to inhibit or impede the passage therethrough of the first solid components.
  • the screening cloth 14 is fitted around a set of rollers 77.1 -77.5 and is driven along a predetermined path in a first travel direction 100 by a drive unit of which the roller 77.5 forms part.
  • the screening cloth 14 passes through a horizontal separating region 18 in which the mixture 12 is introduced onto the screening cloth 14 during use.
  • the screening cloth 14 in the separating region 18 is supported by a series of rollers 17 which rollers are positioned below the separating region 18 and spaced along the travel direction 100 of the screening cloth 14.
  • the series of rollers 17 consists of seven rollers 30 (the exact number of rollers 30 need not necessarily be seven, but can be less or more).
  • Each roller 30 includes a circular cylindrical body 22 which is rotatable about an axis of rotation 24; and a plurality of protuberances in the form of bristles 26 which project outwardly, typically radially from the body 22.
  • the bristles 26 may be between 2mm and 25mm in length. In use, the bristles 26 contact an operatively lower side 41 of the screening cloth 14 in the separating region 18.
  • the friction between the bristles 26 and lower side 41 of the screening cloth 14 causes the body 22 of the roller 30 to rotate about the axis 24.
  • some of the bristles 26 protrude through some of the apertures 1 6 of the screening cloth 14 as it travels over the roller 30 (see Figure 3).
  • the gravitational force acting on the mixture 12 may sometimes not be sufficient to break the surface tension or bridging of the mixture 12 at some of the apertures 1 6 of the screening cloth 14.
  • the surface tension may therefore inhibit the flow of liquid through the apertures 1 6, as well as the passage therethrough of the second solid components, and therefore negatively impact the separation efficiency.
  • some of the first solid components in the mixture 12 may sink down onto an operatively upper surface 23 of the screening cloth 14 and end up covering or blocking some of the apertures 1 6, therefore inhibiting the flow of liquid and the passage of second solid components through those apertures 1 6.
  • reference numeral 101 refers generally to another separation system in accordance with the invention and unless otherwise indicated the same reference numerals used above are used to designate the same parts.
  • the series of rollers 17 includes four rollers 20.
  • Each roller 20 includes a body 21 which is rotatable about an axis of rotation 37.
  • the body 21 is generally circular in transverse cross-section and has an irregular radially outer surface 39.
  • rollers used in current separation systems have a smooth radially outer surface 39 which does not always provide sufficient friction between the rollers and the screening cloth.
  • an "underpan" 42 is positioned below the separating region 18 in order to collect the liquid and second solid components which pass thought the apertures 1 6 in the screening cloth 14.
  • the separation system 10 also includes a chute 43 which is positioned at a discharge end 47 of the separating region 18 in order to collect the first solid components.
  • a feeding arrangement 46 is positioned above the separating region 18 in order to feed the mixture 12 onto the separating region 18.
  • the feeding arrangement 46 includes an opening 99 through which mixture 12 can be received (see arrow 1 19).
  • rollers 20, 30 could vary. In addition, a combination of rollers 20, 30 could be used.
  • the separation system 10, 101 in accordance with the invention provides an effective solution for the problems identified in the background of the specification by unclogging some of the apertures 1 6 which may be clogged by the first solid components and also breaking the surface tension of the mixture 12 at some of the apertures 16, thereby promoting efficient separation.
  • the rollers usually include bearings. Since the rollers, and therefore the bearings, are continuously rotated in a lubricated environment, it will help increase the lifecycle of the bearings.

Landscapes

  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

L'invention concerne un système de séparation (10) permettant de séparer des premiers composants particulaires solides et des seconds composants particulaires solides ayant des grosseurs de particules qui sont inférieures à celles des premiers composants solides, les premiers et seconds composants solides étant suspendus dans un liquide pour former un mélange (12). Le système (10) comprend une courroie/bande de tamisage sans fin (14) qui est en mesure d'être déplacée le long d'une trajectoire prédéterminée. La courroie/bande de tamisage (14) définit une pluralité d'ouvertures (16), ouvertures (16) qui sont d'une taille appropriée pour permettre aux seconds composants solides de passer au travers de celles-ci et pour empêcher le passage des premiers composants solides au travers de celles-ci. Le système (10) comprend aussi au moins un rouleau (17) sur lequel la courroie/bande de tamisage (14) s'étend dans une région de séparation (18). Le rouleau (17) comprend une pluralité de parties saillantes (26) qui font saillie depuis un corps (22) de celui-ci. Les parties saillantes (26) sont configurées de manière mécanique à des fins de mise en prise avec au moins quelques ouvertures (16) de la courroie/bande de tamisage (14) afin de rompre la tension superficielle du mélange (12) fourni sur la région de séparation (18).
PCT/IB2013/053272 2012-04-25 2013-04-25 Système de séparation WO2013160862A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2014/03756A ZA201403756B (en) 2012-04-25 2014-05-22 Separation system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201203045 2012-04-25
ZA2012/03045 2012-04-25

Publications (1)

Publication Number Publication Date
WO2013160862A1 true WO2013160862A1 (fr) 2013-10-31

Family

ID=48652273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2013/053272 WO2013160862A1 (fr) 2012-04-25 2013-04-25 Système de séparation

Country Status (3)

Country Link
AR (1) AR090848A1 (fr)
WO (1) WO2013160862A1 (fr)
ZA (1) ZA201403756B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105312217A (zh) * 2015-11-06 2016-02-10 芜湖禧来旺农业有限公司 一种分料装置
CN108526008A (zh) * 2018-06-19 2018-09-14 石台县秋浦农业科技有限公司 一种富硒菜用筛选机
CN110918455A (zh) * 2019-11-26 2020-03-27 宣城久悠谷电子科技有限公司 一种板材加工用废屑清理筛分系统
CN112044757A (zh) * 2020-10-09 2020-12-08 陈媛媛 一种具有防堵功能的振动筛
CN112893074A (zh) * 2020-12-29 2021-06-04 浙江林龙物流有限公司 一种反冲式泥沙分离装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US287250A (en) * 1883-10-23 Middletof ceawfoed
GB960676A (en) * 1961-09-29 1964-06-10 Otto Hansmann Improvements in or relating to apparatus for classifying granular material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US287250A (en) * 1883-10-23 Middletof ceawfoed
GB960676A (en) * 1961-09-29 1964-06-10 Otto Hansmann Improvements in or relating to apparatus for classifying granular material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105312217A (zh) * 2015-11-06 2016-02-10 芜湖禧来旺农业有限公司 一种分料装置
CN108526008A (zh) * 2018-06-19 2018-09-14 石台县秋浦农业科技有限公司 一种富硒菜用筛选机
CN110918455A (zh) * 2019-11-26 2020-03-27 宣城久悠谷电子科技有限公司 一种板材加工用废屑清理筛分系统
CN112044757A (zh) * 2020-10-09 2020-12-08 陈媛媛 一种具有防堵功能的振动筛
CN112893074A (zh) * 2020-12-29 2021-06-04 浙江林龙物流有限公司 一种反冲式泥沙分离装置

Also Published As

Publication number Publication date
AR090848A1 (es) 2014-12-10
ZA201403756B (en) 2015-06-24

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