GB2396836A - Separation of products of differing densities - Google Patents

Separation of products of differing densities Download PDF

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Publication number
GB2396836A
GB2396836A GB0225929A GB0225929A GB2396836A GB 2396836 A GB2396836 A GB 2396836A GB 0225929 A GB0225929 A GB 0225929A GB 0225929 A GB0225929 A GB 0225929A GB 2396836 A GB2396836 A GB 2396836A
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GB
United Kingdom
Prior art keywords
liquid
container
objects
flow
outlet
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.)
Withdrawn
Application number
GB0225929A
Other versions
GB0225929D0 (en
Inventor
Graham Andrew Sait
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0225929A priority Critical patent/GB2396836A/en
Publication of GB0225929D0 publication Critical patent/GB0225929D0/en
Priority to GB0321922A priority patent/GB2395924A/en
Publication of GB2396836A publication Critical patent/GB2396836A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0018—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0027—Floating sedimentation devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B01D21/2416—Liquid distributors with a plurality of feed points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2433—Discharge mechanisms for floating particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B01D21/2455—Conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2488—Feed or discharge mechanisms for settling tanks bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2494—Feed or discharge mechanisms for settling tanks provided with means for the removal of gas, e.g. noxious gas, air
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36—Devices therefor, other than using centrifugal force
    • B03B5/40—Devices therefor, other than using centrifugal force of trough type
    • 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
    • B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36—Devices therefor, other than using centrifugal force
    • B03B5/40—Devices therefor, other than using centrifugal force of trough type
    • B03B2005/405—Devices therefor, other than using centrifugal force of trough type using horizontal currents

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

Apparatus comprises a container 202 for containing a liquid which has a liquid inlet 204 and a liquid outlet 205, arranged such that when liquid enters the inlet and exits through the outlet a flow of liquid is produced through the container. Objects of different material composition are delivered to the flow of liquid within the container by an object delivery means 201. The container 202 has a first aperture 206 which is positioned to allow objects of a first density range to fall through the flow of liquid and out of the container, and a second aperture 207 positioned to allow objects of a second density range to fall through the flow of liquid and out of the container. Lower density objects are carried partially downstream 515, 514 as they pass through the liquid flow. In a preferred embodiment the container 202 is a cylindrical tank and the liquid flow is spiral. In another embodiment the low density faction exits the container 202 through the outlet 205.

Description

Object Sorting Apparatus
Background of the Invention
The present invention relates to object sorting apparatus for sorting objects from a mixtures of objects of different materials, and a method of sorting objects from a mixtures of objects of different materials.
Brief Summary of the Invention
According to an aspect of the present invention, there is provided an to object sorting apparatus for sorting objects from a mixtures of objects of different materials, said apparatus comprising: a container for containing a liquid, having a liquid inlet, and a liquid outlet, such that when liquid enters said inlet and exits through said outlet a flow of liquid is produced through said container; and an object delivery means for delivering a plurality of objects of different material composition to said flow of liquid within said container, wherein said container has a first aperture configured to allow objects of a first density range to fall through said flow of liquid and out of said container, and a second aperture configured to allow objects of a second density range to fall through said flow of liquid and out of said container.
Brief Description of the Several Views of the Drawings Figure 1 shows an illustration of a system employing the present invention; Figure 2 shows a relative density separator 103 embodying the present invention; Figure 3 shows a plan view of the relative density separator 103; and Figure 4 shows a perspective view of the tank 202 of the separator 103.
Written Description of the Best Mode for Carrying Out the Invention Figure 1 A system employing the present invention is illustrated in Figure 1.
The first process in the system is waste collection 101. Waste collection 101 is substantially a conventional process comprising the collection of domestic waste from households in a region served by the system of Figure 1.
The household waste 111 comprises a mixture of solid objects of differing material composition. For example, household waste comprises: metal objects, such as food cans; glass objects, such as bottles; putrescible 1s material such as vegetable matter, or meat; plastic materials; batteries; paper; and card. Conventionally, collected household waste is deposited at a landfill site, but in the present system, the waste collection process 101 transports the household waste to a reclamation plant. The reclamation plant includes apparatus for sorting the household waste depending upon its constituent materials.
The domestic waste 111 received at the reclamation plant is firstly shredded by shredding apparatus 102. A conveyor is typically used to deliver the waste material into the shredder 102, which is designed to shred the waste to particles having dimensions of typically forty millimetres. The 2s subsequent separating stages of the system have been designed to operate with average particle sizes between thirty and fifty-five millimetres. The separation stages could be simplified by producing smaller particle sizes, for example 4mm, but this would involve much higher shredding costs.
The shredder 102 is an "Untha" dual rotating shredder manufactured by Anton Unterwurzacher Maschinenbau GmbH, of Kuchl, Austria.
Preferably, the shredder is a two stage shedder, but other shredding apparatus capable of providing the required particle sizes may be used.
After shedding, the shredded waste 112 is transported via a conveyor belt to a first stage separation apparatus, in the form of a relative density separator 103. This apparatus will be described in detail below, in reference to Figures 2, 3 and 4. The first stage separation apparatus 103, separates the particulate waste material 112 received from the shredder into four separate groups, depending upon the relative density of the particles. Each of the four groups of material is then individually processed further. Thus, a first group of particulate matter 113 which has a relative density within a 1s smallest predefined range is processed by a second stage process 104. The particulate matter within this range is predominantly low density plastics materials having a relative density less than water, such as expanded polystyrene. Therefore, particulate matter 113 may be further processed to separate out these plastics for the purposes of recycling.
no A second group of particulate matter 114, produced by the relative density separator 103, contains particles having a density within a range which is higher than that of matter 113. The second group of matter 114, contains particles having a density just above that of water, and thus contains particles of paper, card and higher density plastics materials. These plastics z materials are separated from the card and paper, before the card and paper is formed into briquettes within presses 105. The card and paper becomes soaked in water in the relative density separator 103 and, therefore, this water is pressed from the card and paper by the presses 105 for re-use in the separator 103. The presses 105 remove about 85% of the water contained within the card and paper to produce a relatively dry briquette which may be used as a fuel source in a power station.
A third group of particulate matter 115, produced by the relative density separator 103, contains particles having a density within a range which is higher than that of matter 114. This third group of matter 115, contains particles of putrescible matter which may be composted or possibly to disposed of by landfill. The third group of matter 115 also contains other non putrescible material such as rubber which may also be disposed of by landfill.
A fourth group of particulate matter 116, produced by the relative density separator 103, contains particles having a density within a range which is higher than that of matter in any of the other groups 113, 114 or 115.
This fourth group of matter 116, contains particles of glass, minerals, ceramics, metals. For the purposes of this specification, both metal and metal alloys will be referred to herein as metal.
The fourth group of material 116 is further processed by second stage processes 107 which separate the group into subgroups. Thus the material go 116 passes along a conveyor through a magnetic separator which separates out magnetic ferrous metal particles, such as iron and mild steel particles.
The remaining material then passes through an eddy current separator which removes non-magnetic metal particles, such as aluminium, brass, copper, stainless steel and zinc. Both the ferrous and non-ferrous metallic particles may then be recycled.
Figure 2 A relative density separator 103 embodying the present invention is shown schematically in Figure 2. The shredded waste 112 is delivered to the separator 103 via a conveyor belt (not shown). The conveyor belt deposits the shredded waste 112 onto a chute 201, which forms part of the separator 103. The chute 201 is positioned such that its lower end overhangs a tank 202. The tank 202 has an inlet pipe 204 through which it is able to receive water 203, and an outlet 205, located in the floor of said tank, through which water is able to escape by gravity.
The tank 202 has apertures 206 and 207 located in its floor which provide communication between the tank and ducts 208 and 209 respectively. The ducts 208 and 209 lead downwards to conveyor housings 210 and 211 respectively. The conveyor housings 210 and 211 contain conveyor belts 212 and 213 respectively, which run from the ducts 208 and 209 and out through upper open ends 214 and 215 of the conveyor housings. The conveyor belt 212 and its housing 210 are inclined upwards such that an object falling through aperture 208 is transported upwards by the belt 212 to its upper end where it is deposited. The conveyor belt 213 and housing 211 are similarly inclined.
The conveyor housing 210 has a water outlet pipe 230 with a flow control valve 232 to allow a controlled amount of water to escape from the housing. The conveyor housing 211 similarly has an outlet pipe 231 with control valve 233.
2 The combined assembly of the tank 202, the ducts 208 and 209, and the conveyor housings 210 and 211 provide a container which is substantially leak tight, except for the outlet 205, and outlets 230 and 231 when valves 232 and 233 are opened.
During operation, water is supplied to the tank 202 by inlet pipe 204.
Initially, only a proportion of the water escapes though outlet 205, but the tank, the ducts and the conveyor housings 201 and 211 fill up until an equilibrium state is reached in which the water received at the inlet pipe 204 is equal to water lost at the outlet 205, and outlets 230 and 231. By adjusting the rate of water flowing into the tank by an appropriate valve 217 on inlet pipe 204, the water level 216 at the equilibrium state may be adjusted as required. As shown in Figure 2, the upper end of the conveyor housings are arranged to be above the steady state water level 216, so that substantially no water is lost through the conveyor housings, except through outlet valves 230 and 231. Thus, valves 230 and 231 allow water flow though apertures 206 and 207 respectively to be controlled.
Once the equilibrium state is reached, the shredded waste 112 is delivered to the chute 201. Due to the dynamics of the water flow, the shredded waste 112 is separated out depending upon the density of its individual particles. The most dense particles, comprising the fourth group of waste 116, fall through aperture 206 onto conveyor 212 and are transported to its upper end where they are deposited. Particles having a density in a intermediate range of densities, fall through aperture 207 onto conveyor 213 and are transported to its upper end where they are deposited. These particles constitute the third group of particulate matter 115.
Particles having a density less than that of water, tend to float on the water in the tank and they are remove by a skimming process (not shown).
The remaining particles which have densities just above that of water, tend to follow the flow of the water more closely, and consequently leave the tank with the water, as a mixture 218, through outlet 205. This is the second group of particulate matter 114. The mixture 218 is deposited on an inclined vibrating sieve 219, where excess water 220 is drained off. The particulate matter 114 emerges at one end of the sieve and it is retained for the production of briquettes as described above. The water 220 may be further filtered before re-use in the apparatus 103.
During use of the separator 103, the majority of the water leaving the tank 202 exits through the main outlet 205, with between about zero and ten percent being allowed to escape through outlets 230 and 231. By allowing water to escape from the tank through outlets 230 and 231, a flow of water through the ducts 208 and 209 is produced, which assists in guiding the particulate matter through the relevant aperture 206 and 207.
Figure 3 A plan view of the relative density separator 103 is shown in Figure 3.
As shown in Figure 3, the lower end of the chute 201 is positioned above the aperture 206. Thus very dense particles 116, such as metallic particles, or no particles of ceramic tend to fall from the chute and substantially vertically through the water, through the duct 208 and onto conveyor 212.
The less dense particulate material 115 falls from the chute into the water where its path is modified by the water flow in the tank 202. Thus it generally falls through aperture 207 onto conveyor 213. The apertures 206 z5 and 207 are of an elongated oval shape, or as shown in Figure 3, an elongated kidney shape.
The open end of the inlet pipe 204 is located close to the wall of the tank 202, and oriented such that the emerging water is directed circumferencially around said tank. Thus the incoming water generates a rotational flow of water around the tank, which tends to spiral inwards and downwards to the outlet 205. The outlet 205 provides a circular opening concentric with the walls of the tank 202.
Figure 4 A perspective view of the tank 202 of the separator 103 is shown in lo Figure 4. The tank 202 has a cylindrical side wall 401 and a conical shaped floor 402. The conical floor is shaped to provide an angle of thirty degrees with the horizontal. In alternative embodiments, similar separators to separator 103 have conical floor angles ranging from fifty degrees to zero degrees, i.e. a horizontal flat floor.
The chute 201 is arranged to drop the shredded waste 112 onto a defined region 520 on the surface of the water in the tank 202. Once the shredded waste particles 112 enter the water in the tank, their subsequent path depends upon their relative density. The most dense particles generally fall downwards under gravity and their path is relatively unaffected by the flow no of water generated by the water 203 emerging from inlet pipe 204.
Meanwhile, particles having densities close to that of water are strongly affected and their paths follow the flow of water. Typical paths 514, 515 and 516 for the three groups of waste material 114, 115 and 116 are illustrated in Figure 4. Thus particles 116 having a higher range of densities typically fall along path 514 through aperture 206, particles 115 having an intermediate range of densities fall along path 515 through aperture 207 and particles 114 having a lower range of densities generally follow the flow of the water along path 514 through outlet 205.
It should be noted that the particulate matter 116 and 115 is removed from the tank without impeding the rotational flow of water around the tank 202. This is achieved by allowing this matter to fall out of the tank through the apertures 206 and 207 onto conveyors 212 and 213 located outside of the tank. Because the conveyors are located outside the tank, neither the conveyor nor the material on the conveyors affects the rotational flow.
In an alternative embodiment a cuboid shaped tank is used instead of tank 202. A substantially linear flow of water is generated within the tank by positioning a series of inlets along one side of the tank and an outlet at the base of the opposing side. Shredded waste 112 is dropped into the flowing water and the paths of individual particles under gravity are determined by their relative densities. A pair of apertures are arranged in the floor of the cuboid tank, such that they are spaced along the flow of the water.
Consequently higher density matter 116 drops through the first aperture, nearest to the inlet, intermediate density matter 115 falls through the second aperture, and lower density matter 114 follows the flow of the water through the outlet. In a similar manner to separator 103, the apertures provide communication between the tank and conveyor housings, containing conveyors which remove the higher and intermediate density matter 116 and from the separator. Thus, like the separator 103, the flow of water through the tank is unimpeded by these conveyors, because the matter 116 and 115 is simply allowed to fall out of the tank through the apertures in the floor.
In an alternative use of the present invention, the shredded waste 112, comprises particles which are either metallic or plastics material only. Such particles may be produced by the shredding of, for example, automotive components, wiring etc. When used for this purpose, the separator 103 operates in substantially the same manner as described above, with metallic components falling through aperture 207 and the plastics particles falling through outlet 205 with the water. For such purposes an alternative separator to separator 103 may be used which has only one aperture 206 and does not have the second aperture 207.

Claims (8)

  1. Claims 1. Object sorting apparatus for sorting objects from a mixtures of
    objects of different materials, said apparatus comprising: a container for containing a liquid, having a liquid inlet, and a liquid outlet, such that when liquid enters said inlet and exits through said outlet a flow of liquid is produced through said container; and an object delivery means for delivering a plurality of objects of different material composition to said flow of liquid within said container, wherein said container has a first aperture configured to allow objects of a first density range to fall through said flow of liquid and out of said container, and a second aperture configured to allow objects of a second density range to fall through said flow of liquid and out of said container.
  2. 2. Object sorting apparatus according to claim 1, wherein said inlet and outlet are arranged to generate a rotational flow of liquid.
  3. 3. Object sorting apparatus according to claim 1 or claim 2, go wherein said container has a substantially circular cross-section in a horizontal plane.
  4. 4. Object sorting apparatus according to any of claims 1 to 3, wherein said apparatus is configured to receive objects containing material being recycled.
  5. 5. Object sorting apparatus according to any of claims 1 to 4, wherein said apparatus is configured to receive municipal solid waste.
  6. 6. Object sorting apparatus according to any of claims 1 to 4, wherein said apparatus is configured to receive a mixture of objects comprising a plastics material and objects comprising a metal.
  7. 7. Object sorting apparatus according to any of claims 1 to 6, wherein said apparatus includes filtering means configured to remove objects of a third density range from water which has exited from said outlet.
  8. 8. Object sorting apparatus for sorting objects from a mixtures of objects of different materials, said apparatus comprising: a container for containing a liquid, having a liquid inlet, and a liquid outlet, such that when liquid enters said inlet and exits through said outlet a flow of liquid is produced through said container; and an object delivery means for delivering a plurality of objects of different material composition to said flow of liquid within said container, wherein said container has an aperture configured to allow objects of a first density range to fall through said flow of liquid and out of said container, while objects of a second lower density escape through said outlet with said water.
GB0225929A 2002-11-07 2002-11-07 Separation of products of differing densities Withdrawn GB2396836A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0225929A GB2396836A (en) 2002-11-07 2002-11-07 Separation of products of differing densities
GB0321922A GB2395924A (en) 2002-11-07 2003-09-19 Flotation separator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0225929A GB2396836A (en) 2002-11-07 2002-11-07 Separation of products of differing densities

Publications (2)

Publication Number Publication Date
GB0225929D0 GB0225929D0 (en) 2002-12-11
GB2396836A true GB2396836A (en) 2004-07-07

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Application Number Title Priority Date Filing Date
GB0225929A Withdrawn GB2396836A (en) 2002-11-07 2002-11-07 Separation of products of differing densities
GB0321922A Withdrawn GB2395924A (en) 2002-11-07 2003-09-19 Flotation separator

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB0321922A Withdrawn GB2395924A (en) 2002-11-07 2003-09-19 Flotation separator

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2407051A (en) * 2003-09-19 2005-04-20 Graham Andrew Sait Object sorting apparatus by sink-float method
CN111375231A (en) * 2020-04-11 2020-07-07 长兴和泽环保科技有限公司 Sludge scraping device of treatment tank for sewage treatment of environmental protection equipment

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CN102284343A (en) * 2011-08-05 2011-12-21 潍坊金丝达实业有限公司 Improved garbage elutriation machine
AT520212B1 (en) * 2017-12-07 2019-02-15 Saubermacher Dienstleistungs Ag Process and plant for recovering a valuable material from bulk material
CN111389578B (en) * 2020-04-22 2020-11-10 广州市白云第五建筑工程有限公司 A separator for building light material rubbish
US11679394B1 (en) 2022-02-17 2023-06-20 SA Recycling LLC Separation of heavy from light auto shredder residue
CN117427766B (en) * 2023-10-25 2024-05-24 博莱阀门（常州）有限公司 Metal and plastic sorting and recycling equipment and recycling method for valve processing

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GB294210A (en) * 1927-07-20 1929-11-12 Leon Hoyois A process and apparatus for washing materials, such as ores, coals and the like
GB474325A (en) * 1935-12-14 1937-10-29 Krupp Ag An improved process of and apparatus for gravity separation of bulk material, such as coal or ores
GB603215A (en) * 1943-03-19 1948-06-11 Harry Lee Mcneill Method and apparatus for classifying solids suspended in a liquid
US4946584A (en) * 1987-10-05 1990-08-07 George J. Olney, Inc. Hydraulic product separator
JP2001073402A (en) * 1999-09-06 2001-03-21 Toyo Constr Co Ltd Method and device for processing dredging slurry
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GB657090A (en) * 1947-10-07 1951-09-12 Klaas Frederik Tromp Improvements in or relating to a process of separating solid granular materials having different densities
GB668313A (en) * 1949-03-25 1952-03-12 Kloeckner Humboldt Deutz Ag Float-or-sink apparatus for dressing coal and the like
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