WO2002038291A1 - Method and apparatus for separating impurities from coarse or powdery material - Google Patents

Method and apparatus for separating impurities from coarse or powdery material Download PDF

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Publication number
WO2002038291A1
WO2002038291A1 PCT/FI2001/000953 FI0100953W WO0238291A1 WO 2002038291 A1 WO2002038291 A1 WO 2002038291A1 FI 0100953 W FI0100953 W FI 0100953W WO 0238291 A1 WO0238291 A1 WO 0238291A1
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WO
WIPO (PCT)
Prior art keywords
separating gap
separating
gap
rollers
coarse
Prior art date
Application number
PCT/FI2001/000953
Other languages
French (fr)
Inventor
Panelboard Oy Metso
Original Assignee
Vasara, Jussi
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 Vasara, Jussi filed Critical Vasara, Jussi
Priority to AU12400/02A priority Critical patent/AU1240002A/en
Publication of WO2002038291A1 publication Critical patent/WO2002038291A1/en

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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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/10—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects
    • B07B13/11—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects involving travel of particles over surfaces which separate by centrifugal force or by relative friction between particles and such surfaces, e.g. helical sorters
    • B07B13/116—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects involving travel of particles over surfaces which separate by centrifugal force or by relative friction between particles and such surfaces, e.g. helical sorters stratification of dry granular material on a continuously travelling surface, e.g. belt conveyor
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/08—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to weight
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/10—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects
    • 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

Definitions

  • the present invention relates to a method and an apparatus for separating impurities from coarse or powdery material, in which method the coarse or powdery material is conveyed on a conveying means, in which method heavier impurity material is separated from lighter material by means of at least one separating gap provided in the conveying means, and in which method air blasting is used for separation.
  • Patent specification FI 97527 describes a method and apparatus for removing impurities from powdery or coarse material, especially from chip or fiber material.
  • the material to be purified is brought onto an array of adjacent rollers and set into motion by means of the rollers, with the result that heavy impurity particles of greater density drift toward the surface of the rollers and are passed via a wide separating gap off the array of rollers.
  • a drawback with this prior-art system is that the impurity material flow separated via the wide separating gap contains such a large amount of acceptable material that this material flow needs to be passed through an after-purification process.
  • the object of the present invention is to eliminate the disadvantages of prior-art solutions and to achieve a system that makes it possible to substantially reduce the amount of lighter (acceptable) material falling through the separating gap, thus reducing the need for after-purification, by providing a relatively small upward air current in the separating gap.
  • the method of the invention is characterized in that the conveyor is a roller conveyor with rotating rollers conveying the material on an array of rollers, and that an upward air blast is provided in the separating gap, said air blast having an intensity such that it lifts the lighter material in the region of the separating gap so that the lighter material is passed on across the separating gap, preventing lighter material from falling down through the separating gap while permitting heavy impurity material to be screened out through the separating gap.
  • the conveyor used in the apparatus of the invention is a roller conveyor in which rotating rollers convey the material on an array of rollers and the separating gap is provided with an air blasting unit controlled by a control unit and producing in the separating gap an upward air blast of a suitable intensity.
  • a preferred embodiment of the invention is characterized in that the air blast is applied in an oblique upward direction toward the conveying direction, thus contributing towards carrying the lighter particles across the separating gap.
  • the invention makes it possible to achieve a very economical purification system in which the amounts of air used are small and which therefore involves a low energy consumption, and in which a small and simple after-purification apparatus can be used or after-purification can even be omitted in cases where the amount of acceptable material separated together with heavy impurity particles is insignificant.
  • Such an apparatus can readily be mounted in conjunction with e.g. a plan sifter.
  • the apparatus presented in the drawing comprises an array of a plurality of transverse rollers 1 arranged in sequence.
  • the coarse or powdery material 2 to be purified which may consist of e.g. waste material containing fibers and impurity particles amongst them, is fed onto the forward end of the array via feed elements (not shown) placed above it, preferably in a direction transverse to the conveying direction over the entire width of the rollers.
  • the rollers are rotated by a drive mechanism (not shown) in the clockwise direction.
  • the rollers 1 are spaced by narrow clearances A, whose width can be adjusted if necessary.
  • the rollers may be placed in the same plane as in Fig. 1, but they may also be arranged in other ways.
  • a typical width of the narrow clearances A between the rollers is 0.2 - 1.5 mm.
  • a wider separating gap B is provided in the array of rollers to allow heavier impurity particles 3 to be separated from the material flow 2.
  • This wider separating gap B typically has a width of 3 - 40 mm.
  • the widths of the clearances A, B between the rollers naturally depend on e.g. the materials used.
  • the rotating rollers 1 convey the material 2 onward (to the right in Fig. 1) on the array of rollers and produce a favorable agitation in the material bed formed on top of the rollers 1, bringing it e.g. into an almost fluidized state, with the result that material particles of greatest density are moved (concentrated) toward the surface of the array of rollers. As the material reaches the larger gap B, the impurity particles 3 closest to the rollers fall down off the array of rollers.
  • an upward air blast is provided the separating gap, produced by a control unit disposed below the array of rollers in the region of the separating gap B by means of an air blaster 4 and an associated nozzle chamber 5.
  • the intensity of the air blast is adjusted to a level such that it will lift the lighter material in the region of the separating gap 3 so that this lighter material will be carried onto the rollers 1 beyond the separating gap B while the separated impurity material 3 falls down through the separating gap B.
  • the nozzle chamber 5 is mounted in a somewhat oblique position relative to the vertical direction, slanting toward the conveying direction, so that it blows air as indicated by arrow 6 obliquely forward through the separating gap B, thus contributing towards carrying the lighter material flow across the separating gap B. If the array of rollers has a large width, it is possible to use a number of nozzle chambers placed side by side.
  • roller clearances preceding the separating gap B are narrower than the separating gap B, and the separating gap B may be preceded by one or more separating gaps C with no blasting.
  • the separating gap/gaps C preceding gap B is/are wider than the roller clearances A.

Landscapes

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

Abstract

Method for separating impurities from coarse or powdery material (2), in which method the coarse or powdery material is conveyed on a conveyor (1), in which method heavier impurity material (3) is separated from lighter material by means of at least one separating gap (B) provided in the conveying means (1), and in which method air blasting is used for separation. The conveyor is a roller conveyor in which rotating rollers (1) convey the material (2) on an array of rollers, and an upward air blast (6) is provided in the separating gap, said air blast having an intensity such that it lifts the lighter material in the region of the separating gap (B) so that the lighter material is passed on across the separating gap (B).

Description

METHOD AND APPARATUS FOR SEPARATING IMPURITIES FROM COARSE OR POWDERY MATERIAL
The present invention relates to a method and an apparatus for separating impurities from coarse or powdery material, in which method the coarse or powdery material is conveyed on a conveying means, in which method heavier impurity material is separated from lighter material by means of at least one separating gap provided in the conveying means, and in which method air blasting is used for separation.
Patent specification FI 97527 describes a method and apparatus for removing impurities from powdery or coarse material, especially from chip or fiber material. In this method, the material to be purified is brought onto an array of adjacent rollers and set into motion by means of the rollers, with the result that heavy impurity particles of greater density drift toward the surface of the rollers and are passed via a wide separating gap off the array of rollers.
A drawback with this prior-art system is that the impurity material flow separated via the wide separating gap contains such a large amount of acceptable material that this material flow needs to be passed through an after-purification process.
Previously known are also systems in which light particles are separated from the material flow by deviating the lighter material by means of an air blast. Such a system is described e.g. in specification SU 1219354. A drawback with these solutions is especially the fact that they need a large amount of air, involving a high energy consumption.
The object of the present invention is to eliminate the disadvantages of prior-art solutions and to achieve a system that makes it possible to substantially reduce the amount of lighter (acceptable) material falling through the separating gap, thus reducing the need for after-purification, by providing a relatively small upward air current in the separating gap.
Thus, the method of the invention is characterized in that the conveyor is a roller conveyor with rotating rollers conveying the material on an array of rollers, and that an upward air blast is provided in the separating gap, said air blast having an intensity such that it lifts the lighter material in the region of the separating gap so that the lighter material is passed on across the separating gap, preventing lighter material from falling down through the separating gap while permitting heavy impurity material to be screened out through the separating gap. Correspondingly, the conveyor used in the apparatus of the invention is a roller conveyor in which rotating rollers convey the material on an array of rollers and the separating gap is provided with an air blasting unit controlled by a control unit and producing in the separating gap an upward air blast of a suitable intensity.
A preferred embodiment of the invention is characterized in that the air blast is applied in an oblique upward direction toward the conveying direction, thus contributing towards carrying the lighter particles across the separating gap.
The invention makes it possible to achieve a very economical purification system in which the amounts of air used are small and which therefore involves a low energy consumption, and in which a small and simple after-purification apparatus can be used or after-purification can even be omitted in cases where the amount of acceptable material separated together with heavy impurity particles is insignificant. Such an apparatus can readily be mounted in conjunction with e.g. a plan sifter.
In the following, the invention will be described in detail by the aid of examples with reference to the attached drawing, which represents an apparatus according to the invention.
The apparatus presented in the drawing comprises an array of a plurality of transverse rollers 1 arranged in sequence. The coarse or powdery material 2 to be purified, which may consist of e.g. waste material containing fibers and impurity particles amongst them, is fed onto the forward end of the array via feed elements (not shown) placed above it, preferably in a direction transverse to the conveying direction over the entire width of the rollers.
The rollers are rotated by a drive mechanism (not shown) in the clockwise direction. The rollers 1 are spaced by narrow clearances A, whose width can be adjusted if necessary. The rollers may be placed in the same plane as in Fig. 1, but they may also be arranged in other ways.
A typical width of the narrow clearances A between the rollers is 0.2 - 1.5 mm. After these narrow clearances A, a wider separating gap B is provided in the array of rollers to allow heavier impurity particles 3 to be separated from the material flow 2. This wider separating gap B typically has a width of 3 - 40 mm. The widths of the clearances A, B between the rollers naturally depend on e.g. the materials used.
The rotating rollers 1 convey the material 2 onward (to the right in Fig. 1) on the array of rollers and produce a favorable agitation in the material bed formed on top of the rollers 1, bringing it e.g. into an almost fluidized state, with the result that material particles of greatest density are moved (concentrated) toward the surface of the array of rollers. As the material reaches the larger gap B, the impurity particles 3 closest to the rollers fall down off the array of rollers.
To prevent acceptable material from being removed along with impurity particles 3, an upward air blast is provided the separating gap, produced by a control unit disposed below the array of rollers in the region of the separating gap B by means of an air blaster 4 and an associated nozzle chamber 5. The intensity of the air blast is adjusted to a level such that it will lift the lighter material in the region of the separating gap 3 so that this lighter material will be carried onto the rollers 1 beyond the separating gap B while the separated impurity material 3 falls down through the separating gap B.
In a preferred embodiment, the nozzle chamber 5 is mounted in a somewhat oblique position relative to the vertical direction, slanting toward the conveying direction, so that it blows air as indicated by arrow 6 obliquely forward through the separating gap B, thus contributing towards carrying the lighter material flow across the separating gap B. If the array of rollers has a large width, it is possible to use a number of nozzle chambers placed side by side.
Moreover, the roller clearances preceding the separating gap B are narrower than the separating gap B, and the separating gap B may be preceded by one or more separating gaps C with no blasting. In addition, the separating gap/gaps C preceding gap B is/are wider than the roller clearances A.
It is obvious to the person skilled in the art that different embodiments of the invention are not limited to the examples described above, but that they may be varied within the scope of the claims presented below.

Claims

1. Method for separating impurities from coarse or powdery material (2), in which method the coarse or powdery material is conveyed on a conveyor (1), in which method heavier impurity material (3) is separated from lighter material by means of at least one separating gap (B) provided in the conveying means (1), and in which method air blasting is used for separation, characterized in that the conveyor is a roller conveyor in which rotating rollers (1) convey the material (2) on an array of rollers, and an upward air blast (6) is provided in the separating gap, said air blast having an intensity such that it lifts the lighter material in the region of the separating gap (B) so that the lighter material is passed on across the separating gap (B).
2. Method as defined in claim 1 , characterized in that the air blast is applied in an oblique upward direction toward the conveying direction.
3. Method as defined in claim 1 , characterized in that the roller clearances preceding the separating gap (B) are narrower than the separating gap (B).
4. Method as defined in claim 1 , characterized in that the separating gap (B) is preceded by one or more separating gaps (C) with no blasting.
5. Method as defined in claim 1 , characterized in that the separating gap/gaps (C) preceding separating gap (B) is/are wider than the roller clearances (A).
6. Apparatus for separating impurities from coarse or powdery material (2), said apparatus comprising a conveying means (1) on which the coarse or powdery material is conveyed, and at least one separating gap (B) provided in it, in which gap heavier impurity material (3) is separated from lighter material, and said apparatus comprising an air blaster unit provided with a control unit, characterized in that the conveyor is a roller conveyor with rotating rollers (1) conveying the material (2) on an array of rollers, and that the air blaster unit (4, 5) is fitted at the separating gap (B) to produce an upward air blast (6) having an intensity such that it lifts the lighter material in the area of the separating gap (B) so that the lighter material is passed on across the separating gap (B).
7. Apparatus as defined in claim 6, characterized in that the nozzle part (4) of the air blaster unit is mounted in an oblique position relative to the vertical direction, so that the air is blown obliquely upward toward the conveying direction.
8. Apparatus as defined in claim 6, characterized in that the roller clearances preceding the separating gap (B) are narrower than the separating gap (B).
9. Apparatus as defined in claim 6, characterized in that the separating gap (B) is preceded by one or more separating gaps (C) with no blasting.
10. Apparatus as defined in claim 6, characterized in that the separating gap/gaps (C) preceding separating gap (B) is/are wider than the roller clearances (A).
PCT/FI2001/000953 2000-11-07 2001-10-31 Method and apparatus for separating impurities from coarse or powdery material WO2002038291A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12400/02A AU1240002A (en) 2000-11-07 2001-10-31 Method and apparatus for separating impurities from coarse or powdery material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI2000243520001107 2000-11-07
FI20002435A FI20002435A0 (en) 2000-11-07 2000-11-07 Method and apparatus for separating impurities from combustible or powdered material

Publications (1)

Publication Number Publication Date
WO2002038291A1 true WO2002038291A1 (en) 2002-05-16

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AU (1) AU1240002A (en)
FI (1) FI20002435A0 (en)
WO (1) WO2002038291A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1716936A1 (en) 2005-04-26 2006-11-02 Manuel Lindner Device for separating heavy materials

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279740A (en) * 1979-02-19 1981-07-21 Marusho Industrial Co., Ltd. Light-material segregating method and apparatus
WO1982002503A1 (en) * 1981-01-29 1982-08-05 Forsberg Georg Lennart Konstantin Air stream separator
EP0727293A1 (en) * 1995-02-15 1996-08-21 Sunds Defibrator Loviisa Oy Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279740A (en) * 1979-02-19 1981-07-21 Marusho Industrial Co., Ltd. Light-material segregating method and apparatus
WO1982002503A1 (en) * 1981-01-29 1982-08-05 Forsberg Georg Lennart Konstantin Air stream separator
EP0727293A1 (en) * 1995-02-15 1996-08-21 Sunds Defibrator Loviisa Oy Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1716936A1 (en) 2005-04-26 2006-11-02 Manuel Lindner Device for separating heavy materials
WO2006114302A1 (en) * 2005-04-26 2006-11-02 Manuel Lindner Heavy material separator
US7819256B2 (en) 2005-04-26 2010-10-26 Manuel Lindner Heavy material separator

Also Published As

Publication number Publication date
FI20002435A0 (en) 2000-11-07
AU1240002A (en) 2002-05-21

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