EP0550926B1 - Method for extracting and providing in desired composition granular material such as sand - Google Patents

Method for extracting and providing in desired composition granular material such as sand Download PDF

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Publication number
EP0550926B1
EP0550926B1 EP92203831A EP92203831A EP0550926B1 EP 0550926 B1 EP0550926 B1 EP 0550926B1 EP 92203831 A EP92203831 A EP 92203831A EP 92203831 A EP92203831 A EP 92203831A EP 0550926 B1 EP0550926 B1 EP 0550926B1
Authority
EP
European Patent Office
Prior art keywords
granular material
mixture
extraction site
fraction
sand
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
EP92203831A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0550926A1 (en
Inventor
Michael Reinier Smals
Marinus Alphonsus Maria Rats
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.)
Bv Grint- En Zandexploitatiemaatschappij V/h Gebrs Smals
Original Assignee
Bv Grint- En Zandexploitatiemaatschappij V/h Gebrs Smals
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 Bv Grint- En Zandexploitatiemaatschappij V/h Gebrs Smals filed Critical Bv Grint- En Zandexploitatiemaatschappij V/h Gebrs Smals
Publication of EP0550926A1 publication Critical patent/EP0550926A1/en
Application granted granted Critical
Publication of EP0550926B1 publication Critical patent/EP0550926B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00—General arrangement or layout of plant

Definitions

  • EP-A-0 319 070 Described in EP-A-0 319 070 is an installation in which, immediately after being sucked up, the sand is separated into fractions and delivered in a particular desired composition for different purposes, for instance for the concrete industry.
  • US A-170677 teaches an apparatus for mixing materials, in particular materials involved in the preparation of cement or the blending of gasoline, wherein a number of grinding mechanisms for grinding down raw material are disclosed.
  • the present invention has for its object to provide a method with which the sand can be separated into fractions at the extraction site and discharged as optimally as possible in the desired composition while as little as possible is lost.
  • the present invention provides a method for extracting and providing a desired composition of granular material at an extraction site of the granular material, comprising the steps of:
  • An installation 1 is provided with floater bodies 3, 4 and is displaceable (1') through a lake area L already excavated by this installation 1.
  • a barge B to which the extracted sand of a determined specification is delivered can also be seen in fig. 1.
  • An installation 1 (fig. 2) comprises a suction pump 6 which sucks up and delivers the sand to a separating means 7 wherein the granular material of a mean diameter between 80 and 180 mm is discharged as gravel via arrow A to a barge S.
  • a pump 8 the sand with a grain size smaller than 80 mm is added to separating means 9, 10, 11, 12, 13, 14, and 15, which are only designated schematically, where separation takes place into fractions B, C, D, E, F and G.
  • separating means 9-15 comprise dewatering means, float sand beds, cyclones and the like for the purpose of separating the granular material into particular fractions in effective manner.
  • fractions B-G relate to grain sizes of respectively 8-80 mm, 4-8 mm, 2-4 mm, 0.5-2 mm, 250-500 ⁇ m, 100-250 ⁇ m.
  • the fraction B is discharged as gravel in a barge T - or in another embodiment - discharged as gravel in barge S.
  • the fractions C-G are introduced in the composition desired by the end user after they have been stored in the interim. Delivery of the mixture in desired composition is indicated with line H.
  • the feed conveyors (not shown) for the fractions C-G are preferably each provided with devices for determining the quantity of each fraction added to the mixture.
  • a mixture H is well mixed in a mixer 16, details of which are likewise described in EP-A-0 319 070, and delivered to a barge V. After mixing a sample is taken in block 17 in order to check whether the desired composition of the mixture has indeed been obtained and to control automatically or manually the feed of the diverse fractions C-G. Further details hereof are likewise described in the above cited European application.
  • Installation 1 is further provided with means 20 for adding a fraction of extremely small grain size.
  • a portion of the fraction E is carried via a collecting tank 21 and a conveyor 22 to a grinding device 23, in the present case a ball mill.
  • the ground fraction is separated in a first cyclone 26.
  • the small fraction is carried from the first cyclone 26 to a second cyclone 29, wherein a second separation takes place until a fraction is obtained at M with a grain size smaller than 125 ⁇ m.
  • This fraction M is placed in a collecting tank 30 in which this fraction M is kept continually in motion using a stirring means 31.
  • a special pump 32 such as for instance that in use as concrete pump, this fraction of extremely small diameter is carried from the tank 30 to a pre-mixer 33 where the fraction M is mixed together with the fraction G and added to the mixture H.
  • Shown in fig. 3 is a device 41 with which the amount of moisture in each fraction or the mixture, and therefore the amount of dry substance, can be measured, which is of course of the greatest importance for end users.
  • the thickness T of a layer of granular material 40 transported on a conveyor 38 is measured using a radiation source 39, for instance for gamma radiation, and a detector 34 for this radiation, and generated to a recording device 35.
  • a microwave transmitter 36 and a microwave receiver 37 a measure for the moisture present between transmitter 36 and receiver 37 is also generated to the recording device 35, whereafter the dry substance content is calculated by the recording device 35 using calibration factors stored therein.
  • each conveyor for each fraction is preferably provided with both a weighing device for determining the quantity of sand per fraction and a moisture content meter.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Processing Of Solid Wastes (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Fertilizers (AREA)
  • Water Treatment By Sorption (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Disintegrating Or Milling (AREA)
  • Treatment Of Sludge (AREA)
EP92203831A 1991-12-09 1992-12-08 Method for extracting and providing in desired composition granular material such as sand Expired - Lifetime EP0550926B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9102049A NL9102049A (nl) 1991-12-09 1991-12-09 Werkwijze en installatie voor het winnen en in gewenste samenstelling afleveren van korrelvormig materiaal, zoals zand.
NL9102049 1991-12-09

Publications (2)

Publication Number Publication Date
EP0550926A1 EP0550926A1 (en) 1993-07-14
EP0550926B1 true EP0550926B1 (en) 2000-03-29

Family

ID=19860009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92203831A Expired - Lifetime EP0550926B1 (en) 1991-12-09 1992-12-08 Method for extracting and providing in desired composition granular material such as sand

Country Status (9)

Country Link
EP (1) EP0550926B1 (pt)
AT (1) ATE191170T1 (pt)
DE (1) DE69230852T2 (pt)
DK (1) DK0550926T3 (pt)
ES (1) ES2143985T3 (pt)
GR (1) GR3033627T3 (pt)
NL (1) NL9102049A (pt)
PT (1) PT550926E (pt)
SG (1) SG47104A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635091A (zh) * 2012-04-28 2012-08-15 中国水电顾问集团成都勘测设计研究院 土石坝防渗体及其建造方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000091C2 (en) * 1995-04-07 1996-10-08 Dekker Zandbaggerbedrijf B V Sepn., grading and recombination of sand and gravel mixes
NL1012405C2 (nl) * 1999-06-22 2000-12-28 Dekker Zandbaggerbedrijf B V Werkwijzen voor het bewerken van korrelvormig materiaal dat zand en grind omvat.
CN101653765B (zh) * 2009-09-11 2013-01-30 中国葛洲坝集团股份有限公司 一种砾石土料级配调整方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587531A (en) * 1951-02-05 1952-02-26 Conveyor Company Inc Method of and apparatus for proportioning the constituents of materials
US3170677A (en) * 1958-08-19 1965-02-23 Bunker Ramo Apparatus for mixing materials
NL8702774A (nl) * 1987-11-19 1989-06-16 Grint & Zandexpl Mij Vh Smals Werkwijze en installatie voor het winnen van korrelvormig materiaal in een gedefinieerde mengselverhouding en mengeenheid.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635091A (zh) * 2012-04-28 2012-08-15 中国水电顾问集团成都勘测设计研究院 土石坝防渗体及其建造方法

Also Published As

Publication number Publication date
DE69230852T2 (de) 2001-01-04
DE69230852D1 (de) 2000-05-04
EP0550926A1 (en) 1993-07-14
DK0550926T3 (da) 2000-07-03
ES2143985T3 (es) 2000-06-01
GR3033627T3 (en) 2000-10-31
NL9102049A (nl) 1993-07-01
SG47104A1 (en) 1998-03-20
ATE191170T1 (de) 2000-04-15
PT550926E (pt) 2000-07-31

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