EP0864366B1 - Procédé pour la composition de mélanges granulaires à spécifications prédeterminées, à partir de matière de départ granulaire - Google Patents

Procédé pour la composition de mélanges granulaires à spécifications prédeterminées, à partir de matière de départ granulaire Download PDF

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Publication number
EP0864366B1
EP0864366B1 EP19980200591 EP98200591A EP0864366B1 EP 0864366 B1 EP0864366 B1 EP 0864366B1 EP 19980200591 EP19980200591 EP 19980200591 EP 98200591 A EP98200591 A EP 98200591A EP 0864366 B1 EP0864366 B1 EP 0864366B1
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EP
European Patent Office
Prior art keywords
granular
classifying
grain
classifying device
batch
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
EP19980200591
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German (de)
English (en)
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EP0864366A1 (fr
Inventor
Willem Julius Kuiters
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IHC Holland lE BV
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Promin BV
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    • 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
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets

Definitions

  • the invention relates to a method for assembling granular mixtures of predetermined specifications from granular starting material, use being made of a separating device for dividing the granular starting material into grain fractions, comprising at least two classifying devices which each use liquid to divide the granular material fed to them into a first grain fraction and a second grain fraction, which are respectively discharged in the underflow and the overflow of the classifying device in question, which method comprises the following steps:
  • a method of this kind is used, for example, in the sand-dredging industry.
  • the granular starting material consists of untreated sand which is divided by the separating device into a plurality of grain fractions, which are stored. After analysing the grain fractions in order to determine the composition of each grain fraction, a mixing ratio is calculated in order to be able to produce a sand mixture which satisfies the specifications given by a customer.
  • the grain fractions are transported from the various storage locations to a collection point for producing the sand mixture.
  • the drawback of the known method is that each grain fraction is stored separately before mixing the grain fractions to form a granular mixture. Storage and transportation of the grain fractions to and from the storage locations is extremely expensive.
  • the object of the invention is to provide a method in which the grain fractions of the granular starting material coming out of the separating device can be mixed immediately in the correct ratio to form various granular mixtures of predetermined specifications without the need for temporary storage.
  • the invention also relates to a device for carrying out the method according to the invention.
  • the device shown in Fig. 1 for dividing sand into grain fractions comprises a classifying device 1 with an outlet opening 2 for the underflow and an outlet opening 3 for the overflow.
  • the outlet opening 2 may be provided with a controllable shut-off valve (not shown).
  • the classifying device 1 is provided with a water-feed line 4, which water is used for the classification of sand fed to the classifying device. The sand is fed to the classifying device 1 via sand-feed line 27.
  • the measuring bins 6, 7 are each provided with a water-feed line 9, 10. Sensors 11, 12 for measuring a level in the measuring bins are arranged above the measuring bins.
  • the measuring bins 6, 7 are each connected to a weighing device 13, 14.
  • Closable outlet openings 15, 16 in the measuring bins 6, 7 are situated above an funnel 17.
  • An outlet opening 18 in the funnel 17 opens into a sliding chute 19.
  • Collection chutes 20, 21, 22 are arranged beneath the sliding chute 19.
  • the collection chutes 20, 22 each open out into a dewatering/mixing machine 25, 26.
  • the collection chute 21 opens out into a collection tank 28 for residual products, which are discharged from the collection tank 28.
  • rotatable conveyor belts 23, 24 are provided for transporting various products P 1 -P 6 to storage locations.
  • the classifying device 1 has a specific separation level curve, or Tromp curve, which is determined in a laboratory, for specific process parameters.
  • the Tromp curve indicates the probability that grains of a specific size will pass into the underflow or the overflow. This probability is independent of the quantity of grains of that size in the sand supplied. A probability of 100% means that all the grains of that size present in the sand supplied will pass into the underflow. A probability of 10% means that 10% of the grains of that size present in the sand supplied will pass into the underflow and the remaining 90% will pass into the overflow.
  • the quantity of these grains in the underflow will be very low. As the quantity of grains of that size in the sand supplied increases, the quantity of these grains in the underflow will increase proportionally.
  • the course of the Tromp curve remains the same if the process parameters of the classifying device 1 remain identical. The process parameters are kept constant with the aid of accurate measurement sensors and control equipment. The accuracy of the operation is determined by the process control system.
  • the device illustrated in Fig. 1 functions as follows.
  • Sand A is fed to the classifying device 1 through the sand-feed line 27.
  • Water is fed to the classifying device 1 via the water-feed line 4.
  • the water flows through the classifying device from the bottom upwards. Large grains of sand fall downwards, counter to the force exerted by the stream of water on the grains, and pass into the underflow B. Small grains pass into the overflow C.
  • the grain fractions which are situated in the underflow B and the overflow C have a composition which depends on the composition of the sand A supplied and on the Tromp curve of the classifying device 1 under the process parameters prevailing.
  • the underflow B flows through the outlet opening 2 into the sliding hopper 5 and then into the measuring bin 6.
  • the underflow B is a mixture of water and sand.
  • the closable outlet opening 15 of the measuring bin 6 is closed.
  • the level in the measuring bin 6 is measured with the aid of the sensor 11.
  • the level can be measured, for example, with the aid of ultrasonic distance measurement.
  • the sliding hopper 5 is displaced in such a manner that the outlet opening 8 of the sliding hopper 5 opens out into the measuring bin 7. A batch of water-sand mixture is now present in the measuring bin 6.
  • the volume of the batch of water-sand mixture present in the measuring bin 6 is then measured with the aid of the sensor 11.
  • the weighing device 13 measures the weight of the batch present in the measuring bin 6.
  • the measurement data are recorded with the aid of a computer (not shown). With the aid of the information about the volume and the weight of the batch, it is possible to determine the weight of dry sand in the batch.
  • the overflow C is fed via the outlet opening 3 to a subsequent classifying device with a different separation point, where the weight of dry sand in a batch of water-sand mixture coming out of this classifying device is determined in the same way.
  • the quantities of dry sand in the batches coming out of the classifying devices used as defined in the manner indicated above, and the probability percentages which are known from the Tromp curves of the classifying devices can be used to calculate the composition of the sand supplied and of the grain fractions in the underflows of the classifying devices.
  • a computer is used to process the observations from the measurement sensors and to carry out the calculations.
  • the information about the composition of the sand supplied and the grain fractions is used by the computer to make a choice between a number of given products in such a manner that products of as high a quality as possible are produced. Thus the amount of waste is as low as possible.
  • the computer determines which collection chute each batch in the measuring bin is to be discharged to directly.
  • the sliding chute 19 is placed in the correct position.
  • the outlet opening 15 is opened and the batch from the measuring bin 6 is discharged via one of the collection chutes 20, 21, 22 to a dewatering machine 25, 26 or the collecting tank 28.
  • the dewatering machines 25, 26 also serve as a device for mixing batches which come from various measuring bins.
  • extra water is fed in via water-feed line 9, thus shortening the discharge time and allowing the sand to be discharged via slightly inclined slides.
  • the position of the sliding chute 19 is controlled by the computer.
  • the computer is able to calculate the yield of the complete installation and indicate which product is recommended in order to achieve as high a yield as possible using the sand supplied.
  • Fig. 2 diagrammatically illustrates a separating device for dividing sand into different grain fractions.
  • the installation comprises a first, second, third and fourth classifying device K 1 , K 2 , K 3 , K 4 .
  • the first classifying device K 1 which is formed by screens, divides the untreated sand into three grain fractions, a first grain fraction containing grains which are larger than 4 mm, a second grain fraction which contains grains which are between 2 mm and 4 mm, and a third grain fraction which contains grains which are smaller than 2 mm.
  • the quantities of grains in the first and second grain fractions are determined by measuring the weight.
  • the quantity of moisture in the grain fractions coming out of the screen classifying device is generally negligible.
  • Hydrocyclones 30, 31, 32 are placed upstream of the second, third and fourth classifying devices K 2 , K 3 , K 4 . These hydrocyclones separate off the sand of a grain size of less than 0.1 mm.
  • the sand with grains smaller than 2 mm is fed via the hydrocyclone 30 to the second classifying device K 2 , which divides the sand fed to it at the level of 0.5 mm.
  • the underflow from the second classifying device K 2 contains grains of a size between 2 mm and 0.5 mm.
  • the underflow also contains a quantity of incorrect grains which are smaller than 0.5 mm.
  • the overflow from the second classifying device K 2 substantially contains grains of smaller than 0.5 mm.
  • the overflow is fed via the hydrocyclone 31 to the third classifying device K 3 , which divides the sand fed to it at the level of 0.25 mm.
  • the overflow from the third classifying device K 3 is fed via the hydrocyclone 32 to the fourth classifying device K 4 , which divides the sand at the level of 0.1 mm.
  • the quantity of grains which are smaller than 0.1 mm in the underflow of the fourth classifying device K 4 is negligible and is not included in the calculations.
  • the quantities of dry sand in the underflows from the second, third and fourth classifying devices K 2 , K 3 , K 4 are determined with the aid of measuring bins in the manner described above.
  • Fig. 3 shows a Tromp curve for the second classifying device K 2 with a separation point of 0.5 mm.
  • Fig. 4 shows a Tromp curve for the third classifying device K 3 .
  • the separation point for the third classifying device K 3 is 0.25 mm.
  • 10% of the grains from the grain size range E present in the sand supplied are located in the underflow of the second classifying device K 2 .
  • the percentage of the grains present in the sand supplied which are from the grain size range F which is located in the underflow of the second classifying device K 2 is negligible.
  • the remainder of the grains, present in the sand supplied, from the grain size range E and 8% of the grains, present in the sand supplied, from the grain size range F are located in the underflow of the third classifying device K 3 .
  • the amount of grains located in the underflow of the third classifying device K 3 , from the grain size range D present in the sand supplied, is negligible.
  • the underflow of the fourth classifying device K 4 contains 92% of the grains, present in the sand supplied, from the grain size range F.
  • the quantities of grains, present in the sand supplied, from the grain size ranges of less than 0.1 mm and greater than 0.25 mm in the underflow of the fourth classifying device K 4 are negligible.
  • the untreated sand overall differs relatively little from the desired products, a partial classification may be sufficient.
  • the part which in that case is classified has to be divided off from the main stream of material in such a manner that its composition largely corresponds to the remainder of the untreated sand. This is because the composition of the untreated sand can be calculated after the classification, so that it is also possible then to determine which and how much of the classified fractions must be added to the original sand in order to obtain a product of the desired composition. This method provides a considerable saving in investment and energy costs.

Claims (6)

  1. Procédé pour assembler des mélanges granulaires de spécifications prédéterminées à partir d'un matériau de départ en grains, en utilisant un dispositif séparateur pour diviser le matériau de départ en grains en sous-ensembles de grains, comprenant au moins deux dispositifs trieurs qui utilisent chacun du liquide pour diviser le matériau en grains qui leur est amené en un premier sous-ensemble de grains et un second sous-ensemble de grains, qui sont déchargés respectivement dans le courant inférieur et dans le courant supérieur du dispositif trieur en question, lequel procédé comprend les étapes suivantes consistant à :
    amener le matériau de départ en grains au dispositif séparateur,
    diviser le matériau de départ en grains en différents sous-ensembles de grains au moyen du dispositif séparateur,
    déterminer la composition de chacun des sous-ensembles de grains sortant du dispositif séparateur et, sur la base de cette détermination, déterminer un rapport de mélange pour des sous-ensembles de grains dans le but d'assembler un mélange granulaire de spécification prédéterminée,
    convoyer les sous-ensembles de grains vers un point d'assemblage pour assemblage du mélange granulaire,
       caractérisé par les étapes suivantes consistant à :
    déterminer une courbe de Tromp pour chaque dispositif trieur,
    enlever les sous-ensembles de grains par lots de chaque dispositif trieur,
    déterminer, pour chaque sous-ensemble de grains provenant de chaque dispositif trieur, le poids et le volume d'un lot d'un mélange de liquide et du sous-ensemble de grains concerné, et, à partir de ceci,
    déterminer le poids à sec des grains présents dans le lot,
    utiliser la courbe de Tromp de chaque dispositif trieur et les poids à sec des grains présents dans les lots pour calculer la composition du matériau de départ en grains, et
    calculer la composition de chacun des sous-ensembles de grains.
  2. Procédé selon la revendication 1, dans lequel est utilisé un dispositif séparateur avec une pluralité de dispositifs trieurs placés en série, le courant supérieur provenant de chaque dispositif trieur étant amené au dispositif trieur suivant.
  3. Procédé selon la revendication 1 ou 2, dans lequel au moins une partie du matériau de départ en grains est transportée directement au point d'assemblage pour produire le mélange granulaire.
  4. Dispositif pour mettre en oeuvre le procédé selon les revendications 1 à 3, comprenant un dispositif séparateur pour diviser un matériau de départ en grains en sous-ensembles de grains et comprenant au moins deux dispositifs trieurs, qui sont chacun capables, à l'aide d'un liquide, de diviser un matériau en grains qui leur est amené en un premier sous-ensemble de grains et un second sous-ensemble de grains, caractérisé en ce que au moins deux réservoirs de mesure sont prévus dans chaque dispositif trieur pour recevoir un lot de mélange de liquide et de grains sortant du dispositif trieur en question, et en ce que des moyens sont prévus pour déterminer le poids et le volume du lot.
  5. Assemblage comprenant un dispositif trieur, au moins deux réservoirs de mesure pour recevoir un lot de mélange de liquide et de grains sortant du dispositif trieur et des moyens pour déterminer le poids et le volume du lot, lequel assemblage est conçu pour être utilisé dans un dispositif selon la revendication 4.
  6. Dispositif selon la revendication 4, comprenant en outre un dispositif de calcul comme un ordinateur, adapté au calcul du poids de sable sec dans chaque lot en se basant sur le poids et le volume d'un tel lot, et adapté au calcul de la composition de chacun des sous-ensembles de grains en se basant sur les quantités de sable sec telles que mesurées dans les lots produits par lesdits au moins deux dispositifs trieurs.
EP19980200591 1997-03-03 1998-02-25 Procédé pour la composition de mélanges granulaires à spécifications prédeterminées, à partir de matière de départ granulaire Expired - Lifetime EP0864366B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1005413A NL1005413C1 (nl) 1997-03-03 1997-03-03 Werkwijze voor het samenstellen van korrelmengsels met vooraf bepaalde specificaties, uitgaande van korrelvormig uitgangsmateriaal.
NL1005413 1997-03-03

Publications (2)

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EP0864366A1 EP0864366A1 (fr) 1998-09-16
EP0864366B1 true EP0864366B1 (fr) 2002-05-15

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EP19980200591 Expired - Lifetime EP0864366B1 (fr) 1997-03-03 1998-02-25 Procédé pour la composition de mélanges granulaires à spécifications prédeterminées, à partir de matière de départ granulaire

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EP (1) EP0864366B1 (fr)
DE (1) DE69805357T2 (fr)
NL (1) NL1005413C1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8105887A (nl) * 1981-12-29 1983-07-18 Linatex Nederland Bv Werkwijze voor het bereiden van een zandmengsel met een voorafbepaalde korrelgrootteverdeling uit gewonnen ruw zand, alsmede een inrichting voor het toepassen van deze werkwijze.
DE3522478A1 (de) * 1985-06-22 1987-01-02 Aufbreitungsmaschinen Mbh & Co Verfahren und vorrichtung zum herstellen eines kies-sand-fertigproduktes

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EP0864366A1 (fr) 1998-09-16
DE69805357D1 (de) 2002-06-20
DE69805357T2 (de) 2002-09-19
NL1005413C1 (nl) 1998-09-07

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