EP0613723B1 - A method and plant for the screening of especially stone material - Google Patents

A method and plant for the screening of especially stone material Download PDF

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Publication number
EP0613723B1
EP0613723B1 EP94610011A EP94610011A EP0613723B1 EP 0613723 B1 EP0613723 B1 EP 0613723B1 EP 94610011 A EP94610011 A EP 94610011A EP 94610011 A EP94610011 A EP 94610011A EP 0613723 B1 EP0613723 B1 EP 0613723B1
Authority
EP
European Patent Office
Prior art keywords
sieve
water
screening
screening plant
plant according
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.)
Expired - Lifetime
Application number
EP94610011A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0613723A1 (en
Inventor
Jens Erik Kvejborg
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.)
AKSEL BENZIN A/S
Original Assignee
Aksel Benzin AS
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Filing date
Publication date
Application filed by Aksel Benzin AS filed Critical Aksel Benzin AS
Publication of EP0613723A1 publication Critical patent/EP0613723A1/en
Application granted granted Critical
Publication of EP0613723B1 publication Critical patent/EP0613723B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
    • B03B5/10—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on jigs
    • B03B5/24—Constructional details of jigs, e.g. pulse control devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
    • B03B5/10—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on jigs
    • B03B5/20—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on jigs using pulses generated by air injection

Definitions

  • the invention relates to a method for screening, especially of stone material, where the material is supplied to the uppermost end of an inclined sieve, said sieve being submerged in a water-filled vessel, and where the water has a pulsating movement through the sieve and also flows towards the lowermost end of the sieve so that the material on the sieve is fluidized by the upwardly-directed flow and stratified on the sieve in a subsequent order by the downwardly-directed and the longitudinal flow, and in such a manner that the lightest particles lie uppermost and the heaviest particles lowermost, whereby the material to be separated as well as the heavy fraction are dosed and whereby an overflow plate screens out the light fraction.
  • the invention also relates to a plant for the execution of the method.
  • the stone material For use in concrete, the stone material must be of very high quality if damage due to so-called concrete deterioration is to be avoided. It has been known for several years that a content of flint, especially the lime chalco and lime chalcedon types of flint, in stone materials for concrete, causes a great deal of concrete deterioration, which arises as a result of the porosity of the relevant flint material. Lime chalco flint and lime chalcedon flint are to be found in varying amounts in more or less all gravel and sand deposits both on land and at sea.
  • a method for the removal of the relevant undesired components from stone material is screening according to specific gravity, in that the specific gravity is less for flint than for "healthy" stone such as granite and quartz.
  • Stone materials from 0-50 mm can be screened according to specific gravity. It will always be advantageous, and in many cases necessary out of regard for the classification, to carry out the screening of size-screened stone materials, which can be from 0-4 mm, 4-8 mm, 8-16 mm and 16-32 mm. Many earth stones and most of the sea stones can be improved by screening so that they fulfil the requirements for stone in material class M, which contains a max. of 5% light particles, and others so that they fulfil the requirements for material class A, which contains a max. of 1% light particles.
  • a plant for the screening by specific gravity is known from the description in the German patent publication no. 40 06 680.
  • the plant is provided with a cell-wheel in the outlet for the heavy material fraction, and also has a water outlet at the same end of the screening chamber which is intended for the flushing out of the light material fraction which lies uppermost in the material layer.
  • the removal of the heavy particles is regulated by controlling the cell-wheel's speed of rotation on the basis of a given setting which is compared with the signal from a depth sensor which detects the level between heavy and light particles. It is a prerequisite for this plant that there is a relatively large difference in the specific gravity between the heavy and the light components in the stone mixture, or alternatively that there is a great difference between the grain size of the light and heavy particles. If this requirement is not fulfilled, the depth sensor is unable to function satisfactorily, and the result will be a varying content of light particles in the coarse material fraction.
  • this known plant For stone materials of, among other things, earth stones and sea stones for concreting, where the differences in both specific gravity and grain size between the different components in the stone mixture are minimal, this known plant is unsuitable. However, since this plant is intended primarily for use in connection with coal mining operations and mining operations in general, where the conditions with regard to differences in specific gravity are fulfilled, the plant can screen in a satisfactory manner.
  • the dosing actually ensures that the amount of removed material in the heavy fraction constitutes a certain preselected part of the supplied material.
  • This percentage-wise screening of the stone material is advantageous, the reason being that in the extraction of material, e.g. from gravel pits, the composition of the material is known beforehand, and continuous control can be carried out by laboratory examinations. Consequently, should the composition change during a sequence of screening, it is possible merely to adjust the dosing, after which the quality of the screening is re-established. It is possible for this adjustment to be effected automatically.
  • the controlled supply and removal of stone materials, together with the screening by percentage of the two fractions means that the plant can be made relatively simple in its construction, that the process becomes easy to supervise and control, and that the screening becomes independent of an inaccurate detection of the stratification in the screening chamber.
  • the result is a method which distinguishes itself by being able to screen stone materials with very small differences in specific gravity between the different fractions, and which at the same time has a relatively high screening capacity with great screening precision.
  • the overflow plate ensures a precise removal of the light fraction which lies uppermost in the layer of material, and which is flushed out together with the rinsing water.
  • the amount of the light fraction can be determined by suitable regulation of the level of the plate.
  • the regulation of the water level means that the degree of flushing away with the rinsing water can be determined as that layer of material which is cut off by the overflow plate.
  • the damming ensures a calm course of run-off in the area at the discharge end, and at the same time that the stone layer on the sieve is displaced in a uniform manner without any mixing together of the layers before the separation by the overflow plate. Furthermore, a low consumption of water is ensured.
  • the plant comprises an inclined sieve 1 which is mounted in a vessel 6 in such a manner that the slope of the sieve 1 can be adjusted in relation to the horizontal.
  • the vessel 6 is filled with water 15 which is supplied through a valve 16 in order to ensure that the water level lies above the sieve 1.
  • the sieve 1 is configured as a frame with a fine-meshed net in the bottom, said net extending for the whole length of the sieve.
  • the material 12 to be screened is led to the plant via a rotating cell-wheel 2, the rotational speed of which determines the dosing to the uppermost end of the sieve 1.
  • a horizontal overflow plate 4 At the opposite end of the vessel 6 there extends a horizontal overflow plate 4. This plate can be adjusted in height for the determination of the part of the water which is led out over the plate 4, and which separates the light fraction 13 from the material 12.
  • a vertically-extending bulkhead 5 At a distance behind the front edge of the plate 4 there is mounted a vertically-extending bulkhead 5. This bulkhead can likewise be adjusted in height for the determination of the discharge opening for the water.
  • the pressure chamber 7 stands in direct fluid connection with the vessel, so that the pulsations which are generated by the alternate blowing-in and evacuation of compressed air from the pressure chamber 7 are transmitted to the water 15 in the vessel 6.
  • the vessel 6 and the pressure chamber 7 function as connected vessels, whereby a change in the level in the chamber 7 will give rise to a corresponding but opposite change of the level of the water 15 in the vessel 6.
  • the changes in level, or the pulsations generate the upwardly and downwardly-directed flows of water through the sieve 1, which are used for the specific-gravity screening of the material 12 lying on the sieve.
  • the top of the chamber 7 has a built-in slide valve 8 comprising an elongated slide which extends for the full length of the chamber.
  • the slide is moved forwards and backwards by a not-shown mechanical activation arrangement, and in doing so it opens and closes a series of ports which alternately connect the chamber with a source of compressed air and the surrounding atmosphere.
  • the supply of compressed air is indicated by the reference figure 9, and the air exhaustion by the reference figure 10.
  • the air exhaust system has a built-in, not-shown throttle valve. This valve can be regulated and can thus damp the downwardly-directed water flow.
  • the raw material 12 is dosed to the plant via the cell-wheel 2 in such amounts that the removal via the cell-wheel 3 constitutes a predetermined part hereof.
  • the two cell-wheels 2 and 3 are driven by separate electromotors, the rotational speeds of which are regulated by commonly-known frequency transformers.
  • the two cell-wheels 2 and 3 are synchronized via an electronic surveillance and control system to rotate at a certain mutual ratio which can be regulated during operation.
  • the level of the bulkhead 5 and the overflow plate 4, and the angular position of the sieve 1 are set in accordance with the composition of the material and the desired degree of screening. Furthermore, the valve 8 is set for a suitable pulsation of the water 15 through the sieve 1.
  • the material 12 is fed to the sieve 1 where it is fluidized by the upwardly-directed flow of water through the mesh of the sieve, and is thereafter precipitated by the downwardly-directed flow of water and the influence of gravity.
  • the heavy fraction will deposit itself lowermost in the layer, while the light fraction will settle uppermost.
  • the heavy fraction 14 on the other hand, will remain in the water and be led out at the end of the sieve to the cell- wheel 3.
  • the method and the plant ensure a hitherto-unknown high degree of precision in the screening of raw materials 12 having differences in both specific gravity as well as differences in size.
  • the screening is effected in a completely continuous manner and uses the least possible amounts of water and energy.

Landscapes

  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Finishing Walls (AREA)
  • Road Paving Structures (AREA)
  • Revetment (AREA)
EP94610011A 1993-03-01 1994-03-01 A method and plant for the screening of especially stone material Expired - Lifetime EP0613723B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK226/93 1993-03-01
DK22693 1993-03-01
DK022693A DK170550B1 (da) 1993-03-01 1993-03-01 Fremgangsmåde og anlæg til sortering af især stenmateriale

Publications (2)

Publication Number Publication Date
EP0613723A1 EP0613723A1 (en) 1994-09-07
EP0613723B1 true EP0613723B1 (en) 1998-08-05

Family

ID=8091150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94610011A Expired - Lifetime EP0613723B1 (en) 1993-03-01 1994-03-01 A method and plant for the screening of especially stone material

Country Status (4)

Country Link
EP (1) EP0613723B1 (enExample)
AT (1) ATE169245T1 (enExample)
DE (1) DE69412153T2 (enExample)
DK (1) DK170550B1 (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103611721B (zh) * 2013-12-04 2016-03-02 中联重科物料输送设备有限公司 一种水力分离机及建筑废弃物料资源化利用系统
US20200094262A1 (en) * 2016-11-30 2020-03-26 Thomas Valerio Apparatus and method for separating materials using stratification
CN108273654A (zh) * 2017-12-17 2018-07-13 青岛万祥如光机械技术研究有限公司 一种球形食用菌分级设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB615321A (enExample) * 1900-01-01
US4070275A (en) * 1974-02-19 1978-01-24 Vish Minno-Geoloshki Institute-Nis Material treating apparatus including pneumo-hydraulic vibrator
FR2480140A1 (fr) * 1980-04-15 1981-10-16 Fives Cail Babcock Dispositif d'admission et/ou d'echappement d'air pour chambre de pulsation de bac a pistonnage
GB2086265B (en) * 1980-10-31 1983-09-07 Babcock Minerals Engineering L Jig washing plant
DE4006680A1 (de) * 1990-03-03 1991-09-05 Allmineral Aufbereitungstech Setzmaschine

Also Published As

Publication number Publication date
DE69412153D1 (de) 1998-09-10
DK170550B1 (da) 1995-10-23
ATE169245T1 (de) 1998-08-15
DK22693D0 (da) 1993-03-01
EP0613723A1 (en) 1994-09-07
DK22693A (enExample) 1994-09-02
DE69412153T2 (de) 1999-04-22

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