GB2574646A - Hydraulic density separator - Google Patents

Hydraulic density separator Download PDF

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Publication number
GB2574646A
GB2574646A GB1809739.4A GB201809739A GB2574646A GB 2574646 A GB2574646 A GB 2574646A GB 201809739 A GB201809739 A GB 201809739A GB 2574646 A GB2574646 A GB 2574646A
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GB
United Kingdom
Prior art keywords
compartment
density
water
flow
separator
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.)
Pending
Application number
GB1809739.4A
Other versions
GB201809739D0 (en
Inventor
Henry Coulton Richard
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.)
Doppstadt Familienholding GmbH
Original Assignee
Doppstadt Familienholding GmbH
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 Doppstadt Familienholding GmbH filed Critical Doppstadt Familienholding GmbH
Priority to GB1809739.4A priority Critical patent/GB2574646A/en
Publication of GB201809739D0 publication Critical patent/GB201809739D0/en
Publication of GB2574646A publication Critical patent/GB2574646A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00Feed or discharge devices integral with washing or wet-separating equipment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36Devices therefor, other than using centrifugal force
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/44Application of particular media therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B03B5/623Upward current classifiers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B03B5/626Helical separators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets
    • B03B9/06General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36Devices therefor, other than using centrifugal force
    • B03B5/40Devices therefor, other than using centrifugal force of trough type
    • B03B2005/405Devices therefor, other than using centrifugal force of trough type using horizontal currents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00Feed or discharge devices integral with washing or wet-separating equipment
    • B03B2011/008Screw dischargers

Abstract

A hydraulic density separator 1 comprises a first compartment 2 for receiving a mixture comprising higher density elements, lower density elements and water. A flow generator 16 provides an upward flow of water within the first compartment 2. The rate of flow can be adjusted to allow the maximum density of elements entrained by said flow to rise upwardly to be varied. A second compartment 4 receives a mixture comprising water and lower density elements from the first compartment 2. A water flow path is provided from an upper region of the first compartment 2 into the second compartment 4 and over a portion of a mesh screen 8 such that lower density elements entrained by the flow of water are deposited on the screen 8. The screen 8 is configured to move lower density elements from a first position to a second position spaced apart from the first position.

Description

Hydraulic Density Separator
Field of the Invention
The present invention concerns a hydraulic density separator and a method of effecting hydraulic density separation. The invention is particularly, but not exclusively concerned with the separation of materials, such as roadside sweepings, containing wooden elements such as twigs.
Background of the Invention
In a known density separator that may be employed to treat materials collected from the roadside, the materials are introduced into water. Stones and other high density materials sink and low density materials such as leaves and dry twigs float. That enables much of the low density material to be separated from the high density material.
The separation process does, however, have various drawbacks. One particular problem arises with twigs and other wooden debris which, although less dense than water when dry, can become denser than water when wet; in the latter case, the debris sinks along with stones and other high density debris and is not separated therefrom. A further problem arises in the handling of the debris which floats: it proves difficult to separate the floating debris, which may contain rotting leaves and twigs, from the water in which it is floating. If the water is not removed effectively from the debris then the subsequent collection and treatment of the debris is made more difficult and the amount of water that can be recycled in the separation process is reduced. On the other hand, if extra efforts are made to remove more water an increased amount of the lighter debris is likely to be left with that water.
The present invention seeks to mitigate one or more of the above-mentioned problems.
Summary of the Invention
According to a first aspect of the invention there is provided a hydraulic density separator for separating higher density elements and lower density elements of solids material, the apparatus comprising:
a first compartment for receiving a mixture comprising higher density elements and lower density elements, and water;
a flow generator configured to provide an upward flow of water within the first compartment;
means in the first compartment for removing higher density elements that have settled from a lower region of the first compartment; and a second compartment for receiving a mixture comprising water and lower density elements from the first compartment, the second compartment comprising a mesh screen configured to move lower density elements from a first position to a second position spaced apart from the first position;
wherein a water flow path is provided from an upper region of the first compartment into the second compartment and over a portion of the mesh screen such that lower density elements entrained by the flow of water are deposited on the mesh screen.
By providing an upward flow of water within the first compartment, it becomes possible to cause an element that is slightly denser than water to be carried upwards with the floating elements. In that way, a piece of saturated wood, for example, may be kept with other floating elements even though it may be denser than water. Thus, a sufficient upward flow may allow a denser than water object to be carried upward by the flow within the first compartment and onto the mesh screen.
After passing over a portion of the mesh screen the flow path may continue from a lower region of the second compartment to the first compartment. For example, the water may flow from a lower region of the second compartment into a lower region of the first compartment. In that way water is recycled and therefore overall water consumption of the separator much reduced. The water may flow through the flow generator as it passes back into the first compartment or the flow generator may be provided in a separate water flow path.
The separator may further comprise one or more vibrators for vibrating the mesh screen. By vibrating the screen the draining of water through the screen may be enhanced, with the result that less water remains with the debris on the screen.
The mesh screen may act as a conveyor. In a preferred arrangement the vibration of the screen provides the conveying function. The vibration may act to move elements on the screen from an end of the screen adjacent to the first compartment to an opposite end. At the opposite end the elements may be arranged to fall off the end into a collecting means. The mesh screen may be upwardly inclined towards said opposite end.
The separator may further comprise an auger located partially within the first compartment for removing higher density elements that have settled from a lower region of the first compartment. The auger may be a screw auger. The auger may be upwardly inclined from an end located in the first compartment. The auger may have an outlet at its upper end. Higher density elements may fall from the outlet of the auger into a collecting device .
A weir may be located between the first compartment and the second compartment, the flow path passing from the upper region of the first compartment to the second compartment over the weir.
Apertures in the screen may be elongate. The apertures may have a width in the range of 0.5mm to 10mm and more preferably in the range of 1mm to 5mm. The apertures may have a length of about 20mm. Apertures of this kind reduce the risk of elongate objects such as twigs passing through the screen. The screen may be made of various materials. The screen may be made of polyurethane. The screen may be made of steel.
The flow generator may comprise an axial flow pump.
The flow rate of the flow produced by the generator may be adjustable. By adjusting the flow rate of the flow the density threshold at which the higher and lower density elements are separated may be adjusted. For example, increasing the flow will allow denser elements to be entrained upwards by the flow. Decreasing the flow will reduce the maximum density of the elements that are carried upward by the flow. In this way the separation point of the separator can be adjusted to take account of the relative densities of the elements in any particular mixture. This enables the separator to be adapted to provide the most suitable separation for a variety of different materials.
According to a second aspect of the invention there is provided a method of separating higher density elements and lower density elements, the method comprising the following steps:
providing a separator as defined above, introducing water into a first compartment;
introducing a mixture comprising elements of differing densities into the first compartment;
causing water to flow at a first rate from a lower region of the first compartment to an upper region of the first compartment, and from the upper region of the first compartment into a second compartment and over a mesh screen located in the second compartment thereby transporting elements having a density less than a first threshold value from the first compartment to the second compartment and depositing said elements on said screen;
transporting said elements using said screen; and removing higher density elements from a lower region of the first compartment.
The mixture may comprise waste including one or more of stones, soil, twigs, plastic objects, and/or leaves. More particularly: the higher density elements may include stones; the lower density elements may include twigs .
The method may comprise the following further step:
causing water to flow at a second, different, rate from a lower region of the first compartment to an upper region of the first compartment and into a second compartment thereby transporting elements having a density less than a second, different, threshold value from the first compartment to the second compartment.
It will of course be appreciated that features described in relation to one aspect of the present invention may be incorporated into other aspects of the present invention. For example, the method of the invention may incorporate any of the features described with reference to the apparatus of the invention and vice versa .
Description of the Drawings
An embodiment of the present invention will now be described by way of example only with reference to the accompanying schematic drawings of which:
Fig. 1 is a plan view of a hydraulic density separator according to an embodiment of the invention;
Fig. 2 is an isometric view of the separator shown in
Fig. 1; and
Fig. 3 is an end view of the separator shown in Fig.l.
Detailed Description
Fig. 1 is a plan view of a hydraulic density separator 1 in accordance with a first example embodiment of the invention. The separator 1 comprises a first compartment 2, a second compartment 4 adjacent to a first side of the first compartment 2, and a third compartment 6 adjacent to a second side of the first compartment 2. The first and second sides of the first compartment 2 are at right angles to each other. A weir 18 divides the first compartment 2 from the second compartment 4. A mesh screen 8 extends along the length of the second compartment 4 and has a first end 8a adjacent to the weir 18 and a second end 8b at the distal end of the second compartment. As is apparent from the isometric view of Fig. 2, the mesh screen 8 is inclined such that the first end 8a is lower than the second end 8b. Two vibratory motors 10 are connected to the screen 8. A screw auger 12 extends through the first compartment 2 (where it is located at the bottom of the first compartment) and into the third compartment 6. As is apparent from Fig. 2, the auger 12 and the third compartment 6 are inclined such that the end of the auger 12 located in the first compartment 2 is lower than the end of the auger 12 located in the third compartment
6. A motor 14 is located at the distal end of the third compartment 6 and turns the auger 12. A slot 18 is located in the bottom of the third compartment 6 beneath the end of the auger 12. In the front elevation of Fig. 3 an axial pump 16 can be seen mounted on the separator 1 beneath the second compartment 4. It will be appreciated that other elements, for example the control system and electronics required to operate the separator 1 have not been included in Figs. 1 to 3 for the sake of clarity.
Prior to operation, the first compartment 2 is filled with water. In use, the material to be separated is introduced from above (for example, via an upwardly inclined conveyor - not shown)to the first compartment 2. The flow generator 16 generates an upflow of water in the first compartment 2. Lower density elements of the solids material to be separated will be entrained upwards by the flow of water, and carried over the weir 18 into the second compartment 4. As the flow of water and lower density elements enter the second compartment 4 they pass over the mesh screen 18 which will retain the lower density elements, while the water passes through to the underside of the screen. From the underside of the screen 18 the water is returned to the first compartment 2 via the pump 16. Meanwhile, higher density elements of the solids material whose density means the force of gravity still causes them to sink rather than rise, despite the influence of the upflow, will settle to the bottom of the first compartment 2. The auger 12 moves these higher density elements from the bottom of the first compartment 2 to the third compartment 6. After passing along the length of the augur 12 the higher density elements drop through the slot 18 and may be collected in a hopper (not shown) located beneath the third compartment 6. Meanwhile, the motors 10 vibrate the mesh screen 8 thereby causing the elements retained by the screen 8 to move along the screen from the first end 8a to the second end 8b. When they reach the second end 8b of the screen 8 the elements may drop into a hopper (not shown) located beneath the second compartment
4. The flow rate of the upflow may be increased or decreased by varying the power supplied to the pump 16 thereby enabling adjustment and/or alteration of the density threshold wherein elements of solids having a density greater than the threshold sink to the bottom of the compartment over time. Thus, separators in accordance with the present example embodiment may be more versatile than those of the prior art and may be able to separate a wider range of mixtures of materials, including mixtures where the difference in density between the higher and lower density elements in different mixture varies over a wide range. Separators in accordance with the present example embodiment may also offer improved separation of higher and lower density elements as the flow rate can be adjusted during the sorting process.
As the water returns to the first compartment 2 from the second compartment 4 the circulating flow is essentially a closed loop, with just a small amount of additional water required to replenish that lost with the lower and higher density solids. Accordingly, separators in accordance with the present invention may reduce the volume of water required for the separation operation (because the water is recirculated) thereby avoiding the amount of contaminated water that must be safely disposed of after completion of the separation process.
The mesh panel 8 has a grid-like structure defining a plurality of apertures 24. In the embodiment shown the apertures are elongate and have a width of about 2 mm and a length of about 20mm. In use water carrying lower density elements passes over the screen, and the elements on top of the screen while the water passes through the apertures 24. Separators in accordance with the present embodiment may offer an improved separation rate.
Whilst the present invention has been described and illustrated with reference to particular embodiments, it will be appreciated by those of ordinary skill in the art that the invention lends itself to many different variations not specifically illustrated herein. By way of example only, certain possible variations will now be described.
Where in the foregoing description, integers or elements are mentioned which have known, obvious or foreseeable equivalents, then such equivalents are herein incorporated as if individually set forth. Reference should be made to the claims for determining the true scope of the present invention, which should be construed so as to encompass any such eguivalents. It will also be appreciated by the reader that integers or features of the invention that are described as preferable, advantageous, convenient or the like are optional and do not limit the scope of the independent claims. Moreover, it is to be understood that such optional integers or features, whilst of possible benefit in some embodiments of the invention, may not be desirable, and may therefore be absent, in other embodiments.

Claims (14)

Claims
1. A hydraulic density separator for separating higher density elements and lower density elements of solids material, the apparatus comprising:
- a first compartment for receiving a mixture comprising higher density elements and lower density elements, and water;
- a flow generator configured to provide an upward flow of water within the first compartment, the apparatus being configured such that the rate of said flow can be adjusted to allow the maximum density of elements that will be entrained by said flow and rise upwardly to be varied;
- means in the first compartment for removing higher density elements that have settled from a lower region of the first compartment,
- a second compartment for receiving a mixture comprising water and lower density elements from the first compartment, the second compartment comprising a mesh screen configured to move lower density elements from a first position to a second position spaced apart from the first position; and
- wherein a water flow path is provided from an upper region of the first compartment into the second compartment and over a portion of the mesh screen such that lower density elements entrained by the flow of water are deposited on the mesh screen.
2. A separator according to claim 1, wherein after passing over a portion of the mesh screen the flow path continues from a lower region of the second compartment to the first compartment.
3. A separator according to any previous claim, further comprising one or more vibrators for vibrating the mesh screen.
4. A separator according to any preceding claim, wherein the mesh screen acts as a conveyor.
5. A separator according to any previous claim, further comprising an auger located partially within the first compartment for removing higher density elements that have settled from a lower region of the first compartment.
6. A separator according to any previous claim, comprising a weir located between the first compartment and the second compartment, the flow path passing from the upper region of the first compartment to the second compartment over the weir.
7. A separator according to any preceding claim, wherein the apertures in the screen are elongate.
8. A separator according to any preceding claim, wherein the apertures in the screen have a width in the range of 1 to 5mm.
9. A separator according to any preceding claim, wherein the flow generator comprises an axial flow pump.
10. A method of separating higher density elements and lower density elements, the method comprising the following steps:
- providing a separator according to any preceding claim,
- introducing water into the first compartment; introducing a mixture comprising elements of differing densities into the first compartment;
- causing water to flow from a lower region of the first compartment to an upper region of the first compartment, and from the upper region of the first compartment into a second compartment and over the mesh screen located in the second compartment thereby transporting elements having a density less than a threshold value from the first compartment to the second compartment and depositing said elements on said screen;
- transporting said elements using said screen; and
- removing higher density elements from a lower region of the first compartment.
11. A method according to claim 10, wherein the mixture comprises waste including one or more of stones, soil, twigs, plastic objects, and/or leaves.
12. A method according to claim 11, wherein the higher density elements include stones.
13. A method according to claim 11 or 12, wherein the lower density elements include twigs.
14. A method according to any of claims 10 to 13, the method comprising the following further step:
- causing water to flow at a second, different, rate from a lower region of the first compartment to an upper region of the first compartment and into a second compartment thereby transporting elements having a density less than a second, different, threshold value from the first compartment to the second compartment.
GB1809739.4A 2018-06-14 2018-06-14 Hydraulic density separator Pending GB2574646A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1809739.4A GB2574646A (en) 2018-06-14 2018-06-14 Hydraulic density separator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1809739.4A GB2574646A (en) 2018-06-14 2018-06-14 Hydraulic density separator
EP19179588.9A EP3581276B1 (en) 2018-06-14 2019-06-12 Hydraulic density separator

Publications (2)

Publication Number Publication Date
GB201809739D0 GB201809739D0 (en) 2018-08-01
GB2574646A true GB2574646A (en) 2019-12-18

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ID=63042428

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1809739.4A Pending GB2574646A (en) 2018-06-14 2018-06-14 Hydraulic density separator

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GB (1) GB2574646A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1334248A (en) * 1970-02-04 1973-10-17 Battelle Development Corp Method and apparatus for separating objects accordint to density
DD108906A1 (en) * 1973-12-05 1974-10-12
GB2407051A (en) * 2003-09-19 2005-04-20 Graham Andrew Sait Object sorting apparatus by sink-float method
TW200840654A (en) * 2007-04-12 2008-10-16 Steven Tse Tiny-material garbage processing and classifying device
WO2016079635A1 (en) * 2014-11-21 2016-05-26 Wamgroup S.P.A. A feeding device and a plant for reclaiming concrete residues

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698087A (en) * 1953-12-08 1954-12-28 David L Call Flotation separation tank
US3682299A (en) * 1970-03-30 1972-08-08 Vrain C Conley Gravel washer and trash separator, process and apparatus
US4397424A (en) * 1980-08-25 1983-08-09 M.A. Industries, Inc. Battery reclaiming method and apparatus
KR100804140B1 (en) * 2007-11-13 2008-02-19 주식회사 세창환경산업 Chip selector of recycled aggregate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1334248A (en) * 1970-02-04 1973-10-17 Battelle Development Corp Method and apparatus for separating objects accordint to density
DD108906A1 (en) * 1973-12-05 1974-10-12
GB2407051A (en) * 2003-09-19 2005-04-20 Graham Andrew Sait Object sorting apparatus by sink-float method
TW200840654A (en) * 2007-04-12 2008-10-16 Steven Tse Tiny-material garbage processing and classifying device
WO2016079635A1 (en) * 2014-11-21 2016-05-26 Wamgroup S.P.A. A feeding device and a plant for reclaiming concrete residues

Also Published As

Publication number Publication date
GB201809739D0 (en) 2018-08-01
EP3581276B1 (en) 2021-05-05
EP3581276A1 (en) 2019-12-18

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Owner name: DOPPSTADT FAMILIENHOLDING GMBH

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