WO2017029610A1 - Cleaning of aggregate materials such as rail track ballast material - Google Patents
Cleaning of aggregate materials such as rail track ballast material Download PDFInfo
- Publication number
- WO2017029610A1 WO2017029610A1 PCT/IB2016/054915 IB2016054915W WO2017029610A1 WO 2017029610 A1 WO2017029610 A1 WO 2017029610A1 IB 2016054915 W IB2016054915 W IB 2016054915W WO 2017029610 A1 WO2017029610 A1 WO 2017029610A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aggregate
- cavity
- air
- contaminants
- stone
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 43
- 238000004140 cleaning Methods 0.000 title description 17
- 239000000356 contaminant Substances 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 239000004575 stone Substances 0.000 description 63
- 239000010425 asbestos Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- 229910052895 riebeckite Inorganic materials 0.000 description 13
- 238000000605 extraction Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000005484 gravity Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000005180 public health Effects 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000383 hazardous chemical Substances 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000005183 environmental health Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005202 decontamination Methods 0.000 description 2
- 230000003588 decontaminative effect Effects 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
- B07B4/06—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall using revolving drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
-
- B08B1/12—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
- B08B5/023—Cleaning travelling work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
- B08B5/023—Cleaning travelling work
- B08B5/026—Cleaning moving webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/04—Cleaning by suction, with or without auxiliary action
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
Definitions
- This invention relates to the cleaning of aggregate, especially rail track ballast material that is contaminated with asbestos fibres, although the invention is not limited to any type of contaminant to be removed from the aggregate.
- aggregate is used herein to refer to material also known as "construction aggregate”, which refers to a broad category of coarse particulate material that is used in construction and which typically include gravel, crushed stone, slag, recycled concrete, geosynthetic materials, and the like.
- construction aggregate refers to a broad category of coarse particulate material that is used in construction and which typically include gravel, crushed stone, slag, recycled concrete, geosynthetic materials, and the like.
- the invention is described herein largely with reference to aggregate used as rail track ballast material, but it is applicable to various aggregates and is not restricted to rail track ballast material.
- ballast fouling or impairment includes, but are not limited to, material/fines rising up from the subgrade, damage attributable to friction processes, spillage during transport and contamination e.g. by chemicals used to treat timber sleepers, welding residues, etc.
- Fouling or impairment of the track ballast affects its functionality i.e. the material loses its mechanical properties (e.g. becomes worn), reduces the elasticity of the track, impedes water permeability etc., has the potential to degrade the natural environment and poses a significant public health risk. Consequently, in order to sustain its function, conserve the environment and protect the communities directly or indirectly exposed to contaminants it is imperative to maintain, redistribute, screen (remove unsuitable material), clean and/or replace rail track ballast material.
- ballast maintenance systems/ballast cleaning, distribution and profiling machines to clean, redistribute or remove, replace and dispose of unsuitable ballast material when required.
- Unsuitable track ballast material is removed from the track bed and replaced as part of track maintenance activities.
- the possibility of the reintroduction of contaminated material and the dispersion of pollutants to other locations is high.
- the existing ballast maintenance systems/ballast cleaning, distribution and profiling etc. machines are not designed to deal with, remove or treat most contaminants e.g. fuel and lubricants residues, hazardous elements of chemicals used to treat timber sleepers, metals from track corrosion and wear, welding residues, toxic residues of cargo etc.
- Asbestos is another contaminant that has been identified in rail track beds/on track ballast material and is often spread throughout the rail track structure and deposited on adjacent areas during the cleaning, redistribution, profiling, removal, replacement and/or discarding of track ballast material and/or through natural processes.
- the aforesaid processes increase the extent of pollution by spreading the contaminant throughout the rail track system and to neighbouring areas.
- Cleaning, redistribution, profiling, removal, replacement and/or discarding of track ballast material therefore exacerbate the current situation regarding asbestos contamination.
- track ballast maintenance etc. exposes rail staff, personnel accompanying ballast maintenance systems/ballast cleaning machines and the general public to the contaminant.
- the present invention seeks to conserve primary resources, optimise the use of track ballast, provide a cost-effective and environmentally responsible method of treatment for contaminated track ballast material (in situ/in place and/or removed from the rail track bed), remove contaminants from the rail track system and to provide a solution to the persistent reintroduction of contaminants throughout the rail track system.
- a method for treating contaminated aggregate comprising:
- the method may include maintaining the cavity at a pressure that is lower than the pressure outside the chamber, i.e. at a negative pressure.
- the method may include brushing the aggregate.
- the method may include supporting the aggregate on a perforated substrate such as a wire mesh conveyor, a screen, a rotary trammel, or the like, and may include directing at least some of the jets of pressurised air onto the aggregate from below, through the perforated substrate, or from any other angle.
- the method may include directing at least some of the jets of pressurised air onto the aggregate, from hand operated nozzles.
- the method may include separating fine material from the aggregate prior to exposing the aggregate to a jet of pressurised air, e.g. by screening - preferably through multiple sized screens or sieves.
- the method may include agitating the aggregate inside the cavity, e.g. by rotating the aggregate in a rotary drum.
- the aggregate may be fed to the cavity by vacuum suction.
- the method may be applied to various aggregates and is particularly suitable for separating contaminants from aggregates in the form of rail track ballast material.
- Figure 1 shows a schematic side view of a first embodiment of apparatus, in use, for cleaning aggregate according to the present invention
- Figure 2 shows a schematic plan view of part of the apparatus of Figure 1 ;
- Figure 3 shows a schematic side view of a variation on the first embodiment of apparatus, in use, for cleaning aggregate according to the present invention
- Figure 4 shows a schematic cross-sectional view of a rotary drum of a second embodiment of apparatus for cleaning aggregate according to the present invention
- Figure 5 shows a schematic side view of the second embodiment of apparatus for cleaning aggregate according to the present invention
- Figure 6 shows a schematic sectional view of part of the apparatus of Figure 5; and Figure 7 shows a schematic side view of a third embodiment of apparatus for cleaning aggregate according to the present invention.
- plant or apparatus for cleaning aggregate such as rail track ballast material according to the present invention
- reference number 10 plant or apparatus for cleaning aggregate such as rail track ballast material according to the present invention
- the same reference numbers are used in Figures 1 to 3 and differences between the drawings (e.g. the omission of the external enclosure in Figure 1 and of the cylindrical brush and blowguns in Figure 3) are mere variations on the process and/or are for clarity of illustration, while the methods illustrated in Figures 1 to 3 are essentially the same and are described below as a single process. These methods / processes are in any event mere examples of the present invention and can be varied, in practice.
- the plant 10 includes a chamber housing 12 that partly encloses a chamber cavity 14 and the chamber housing 12 is, in turn, housed inside an external enclosure 16, which could be a cargo container, or the like.
- the air pressure inside the external enclosure 16 is maintained at a moderate vacuum, by withdrawing air through an extractor 18 and controlling flow of air into the enclosure via an inlet 20.
- the purpose of maintaining this vacuum is to avoid contaminants from escaping from the enclosure 16 and air samples are taken from time to time, as necessary, to ensure that this is effective.
- Typical flow of air inside the external enclosure 16 is shown by arrows in Figure 3.
- a supply conveyor 22 supplies contaminated aggregate, which could be particulate rail track railway ballast material, or other construction aggregate - and which is referred to as "stone” 24 herein, for brevity.
- the supply conveyor 22 passes through the external enclosure 16 with a narrow fit and with suitable arrangements such as flexible curtains, to minimise air ingress (if desired) and the stone 24 is deposited from the end of the supply conveyor onto an inclined grid 26 of wire mesh, or the like, which allows fines to pass through the grid under gravity and to be collected in a fines container 28.
- the stone 24 is discharged from the end of the inclined grid 26 onto a perforated substrate in the form of a wire mesh conveyor 30, on which the stone is supported while the conveyor 30 passes it through the chamber cavity 14.
- Air pressure inside the chamber cavity 14 is also maintained at a vacuum (preferably even lower than the external enclosure 16) and the feed of stone 24 into and out of the chamber cavity by the wire mesh conveyor also takes place with suitable arrangements to minimise air passing between the enclosure 16 and the chamber cavity 14.
- the purpose of maintaining the vacuum in the chamber cavity 14 is to avoid contaminants from escaping from the cavity and air samples are taken as necessary, to ensure that this is effective. Typical flow of air inside the chamber cavity 14 is shown by arrows in Figure 3.
- the stone 24 passes underneath a self-adjusting, rotating cylindrical brush 32, which loosens contaminants such as asbestos fibres from the surfaces of the stone.
- Compressed air is supplied via a manifold 34 to an array of upwardly directed fixed nozzles 36 that are positioned below the wire mesh conveyor 30 and jets of compressed air blow from the nozzles, through the wire mesh conveyor onto the stone.
- Further nozzles can be provided to direct jets of compressed air onto the stone 24 from the sides and/or from above.
- Hand-operated nozzles or blowguns 38 are supplied with compressed air from the manifold 34 or elsewhere and can be operated by hand to direct jets of compressed air onto the stone.
- a laminated window 42 is shown in Figure 1 , to allow operators to view the inside of the chamber cavity 14. Air inside the chamber cavity 14, with suspended contaminants, is withdrawn from the chamber cavity via an extraction point 44 and this is preferably done by means of a vacuum that is strong enough to maintain the negative pressure (vacuum) inside the chamber cavity mentioned above, to prevent contaminants from escaping from the chamber cavity, other than via the extraction point 44.
- the air with suspended contaminants withdrawn from the chamber cavity 14 via the extraction point 44, is fed to a filter unit (not shown in Figures 1 to 3) where the contaminants are removed from the air.
- the filter unit preferably includes an industrial centrifugal (cyclone) filter for initial recovery of contaminants, a bag filter unit for further recovery of contaminants and lastly, a high-efficiency particulate air filter (HEPA filter).
- HEPA filter high-efficiency particulate air filter
- the filtered air is vented to atmosphere.
- the filter arrangement will depend on the nature and quantities of the contaminants to be removed from the stone.
- the stone 24 After the stone 24 has been treated in the chamber cavity 14, the stone is guided by guides 46 to narrow the process stream of stone and the wire mesh conveyor 30 feeds it through exit openings in the chamber housing 12 and external enclosure 16 (with suitable arrangements to minimise air ingress into the chamber housing and external enclosure) and the treated stone is stockpiled for reuse, after suitable testing to ensure adequate decontamination of the stone.
- Filter elements in which the contaminants have been recovered, as well as organic and inorganic contaminants collected in dust collectors or bag filters, are removed from the plant 10 time to time and are double bagged, labelled and discarded as hazardous waste. Instead, or in addition, these waste materials can undergo thermal treatment such as incineration, to reduce the volume and/or mass or material that requires disposing, even further.
- the volume and mass of this hazardous waste are very small fractions of the volume and mass of the contaminated stone that has been treated in the plant 10 - and that would otherwise have needed disposal as hazardous waste.
- FIG. 6 another embodiment of plant for cleaning contaminated stone 24 is shown.
- This plant is identified, generally, by reference number 60 and features that are common between the plant 60 and the plant 10, are identified by the same reference numbers - even if the configurations of these features vary between the plants 10 and 60.
- the plant 60 includes a chamber housing 12 that encloses a chamber cavity 14 that is preferably maintained under vacuum. Inside the chamber cavity 14, a robust rotary drum 62 or trommel is provided, which is supported and driven to rotate about an inclined rotational axis 64.
- the drum 62 has a generally cylindrical shape with an inlet opening 66 at its upper end and a discharge opening 68 at its lower end.
- circumferential flanges 70 extend inwards from the cylindrical wall of the drum and longitudinal ribs 72 extend between the flanges, to form a rib cage-like structure, with multiple box-shaped open recesses 74 along the inside of the drum 62.
- a lower part of the inlet opening 66 is in register with an opening 76 in the chamber housing 12 and on the outside of the chamber, a hopper or chute 78 feeds the contaminated stone 24 to the opening 76.
- a manifold 34 extends into the inside of the drum 62 through the inlet opening 66 and is connected to a supply of compressed air (not shown), to blow jets of the compressed air through multiple nozzles 36 on the inside of the drum.
- An extraction inlet 80 extends into the chamber cavity 14 through the discharge opening 68 and is configured to draw air from the chamber cavity and feed it to a filter unit 82.
- a filter unit 82 is shown in broken lines in Figure 5.
- the operation of the plant 60 is similar to the plant 10 described above, in that contaminated stone 24 is fed into the chute 78 and is fed via the openings 76 and 66 to the inside of the chamber cavity 14, under gravity, while avoiding excessive air ingress with the infeed of stone 24.
- drum 62 Inside the drum 62, rotation of the drum agitates the stone 24 by causing the stone to be lifted up the ascending side of the rotating drum, inside the recesses 74, but to drop from the recesses, under gravity, into other recesses below, as the recesses approach the top of their rotation. The impact of this dropping action assists in dislodging asbestos fibres and other contaminants from the surfaces of the stone 24.
- a drum 62 with an internal spiral formation can be used (nor shown), but the ribcage-like structure described above is easier and less costly to manufacture and its operation is preferred.
- the stone 24 As the stone 24 is repeatedly dropped inside the rotating drum 62, it is also exposed to jets of compressed air from the nozzles 36 - which can be aimed at the stone in any direction, but the manifold should preferably be clear of the path of dropping stone.
- the jets of compressed air also assists in dislodging asbestos fibres and other contaminants from the stone 24 and causes the contaminants to be suspended in the air inside the chamber cavity 14.
- the repeated dropping action of the stone, imparted by the rotating drum 62 causes the individual stones to be "flipped over" and to have different sides/aspects of the stones exposed to the jets of compressed air.
- the contaminants preferably remain trapped inside the chamber cavity 14 (owing to the moderate vacuum maintained in the chamber cavity) and the air, with suspended contaminants is constantly withdrawn through the extraction inlet and the air is filtered in the filter unit 80, much as described above with reference to Figures 1 to 3.
- the rotation of the drum 62 at its inclined orientation causes the stone 24 to migrate gradually towards the bottom of the drum and clean stone is discharged from the bottom of the drum through a suitable discharge arrangement.
- As the stone 24 migrates along the drum 62 it is also screened by screens provided at intervals in the ribcage structure, in the form of perforated sections within the drum.
- FIG. 7 another embodiment of plant for cleaning contaminated stone 24 is shown.
- This plant is identified, generally, by reference number 90 and features that are common between the plant 60 and the plant 90, are identified by the same reference numbers - even if the configurations of these features vary between the plants 60 and 90.
- the plant 90 includes a chamber housing 12 enclosing a chamber cavity 14 that is preferably maintained under vacuum, a perforated rotary drum 62 or trommel that rotates about an inclined rotational axis 64 in the chamber, with an extraction inlet 80 extending into the lower end of the drum, for withdrawing air with suspended contaminants from the inside of the drum and feeding it to an external filter unit.
- the chamber housing 12 is connected to a feed hopper 92.
- Stone for decontamination can be fed to the hopper 92 in various ways, but in a preferred embodiment of the invention, the stone is lifted from a rest position, such as a position forming part of a rail track ballast, by means of vacuum suction and the vacuum suction is used to convey the stone to the hopper 92.
- a rest position such as a position forming part of a rail track ballast
- vacuum suction is used to convey the stone to the hopper 92.
- suitable mechanical separation means such as centrifugal separation, screening, or the like and only the stone is fed to the hopper 92, while the fines/contaminants are collected separately.
- the separation mechanism 94 which could take various forms, such as an inclined screen; fixed, rotating and/or reciprocal brushes; an array of rollers; or the like - and preferably includes any apparatus that can dislodge contaminants from the stone mechanically, with friction, agitation, or the like.
- the separation mechanism 94 is preferably inclined to allow stone to travel under gravity along the separation mechanism and to be deposited inside the drum 62 at a position intermediate the ends of the drum, where fines and/or contaminants dislodged from the stone in the separation mechanism 94, passes through the perforated wall of the drum 62 and is collected in a waste bag 96, or the like.
- Compressed air is blown via a manifold and nozzles (not shown) in a plurality of jets from the outside of the drum 62, through the perforated cylindrical wall of the drum, onto the stone that is agitated by rotation of the drum and that migrates gradually longitudinally along the drum under gravity.
- compressed air may be blown onto the stone via jets directed to the stone from other angles, while the stone is inside the cavity 14.
- the plant 90 operates substantially the same as the plant 60, with contaminants being lifted from the stone in the drum by the air jets impinging on the stone, the dislodged contaminants being suspended in the air inside the cavity 14, from where it is withdrawn through the extraction inlet 80, to be filtered.
- the plant 10, 60 and/or 90 can be a permanent/fixed plant or it can be mobile, which could allowing it to be self-propelled or it could be towed, e.g. it can be towed on tracks.
- the plant can be used independently, but in embodiments of the invention where the plant is intended for removing contaminants from rail track ballast material, the plant can be incorporated into, or used in combination with rail structure maintenance systems, ballast cleaning or maintenance machines, or the like.
- the different perforated substrates in the forms of the wire mesh conveyor 30 and the rotary screen of the drum 62 can be interchanged, combined and/or substituted with other perforated supports (e.g. a vibrating inclined screen).
- various feed mechanisms such as the vacuum supply described with reference to Figure 7, the conveyor 22 shown in Figure 3, and/or other feed structures such as the chute 78 of Figures 5 and 6, the inclined screen of Figure 1 and the hopper 92 of Figure 7; can be interchanged, combined and or substituted.
- the various nozzle arrangements shown in the different embodiments can be interchanged, combined and/or substituted.
- the invention also removes other contaminants such as sand, grit, silica dust, lead concentrate, manganese and other heavy metals.
- the invention reduces the carbon footprint linked to transportation of the stone 24, reduces the exploitation of natural resources by recovering and re-using the stone, reduces the need for new "tipping" sites for dumping discarded material, which reduces the need to use productive land for such tipping sites, and decreases the load on landfill sites that are designated to accept hazardous materials.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA201505976 | 2015-08-19 | ||
ZA2015/05976 | 2015-08-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017029610A1 true WO2017029610A1 (en) | 2017-02-23 |
Family
ID=58052114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2016/054915 WO2017029610A1 (en) | 2015-08-19 | 2016-08-17 | Cleaning of aggregate materials such as rail track ballast material |
Country Status (2)
Country | Link |
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WO (1) | WO2017029610A1 (en) |
ZA (1) | ZA201605691B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107899035A (en) * | 2017-11-17 | 2018-04-13 | 魔水科技(北京)有限公司 | A kind of portable germicidal device |
CN109290239A (en) * | 2018-10-30 | 2019-02-01 | 夏士桀 | A kind of novel surface processing unit of new material manufacture field |
CN109877038A (en) * | 2019-03-07 | 2019-06-14 | 大同新成新材料股份有限公司 | A kind of agglomerated activated carbon screening plant |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2391150C1 (en) * | 2009-03-23 | 2010-06-10 | Общество с ограниченной ответственностью "Научно-производственная фирма "АЭРОМЕХ" (ООО "НПФ "АЭРОМЕХ") | Pneumatic system for installation of loose mixture air separation in fluid medium |
RU2431529C1 (en) * | 2010-06-16 | 2011-10-20 | Владимир Степанович Сухин | Method of separating loose mix in fluid and device to this end |
UA97423C2 (en) * | 2010-05-25 | 2012-02-10 | Володимир Степанович Сухін | Method and device for separating bulk material in flowing fluid |
CN105057205A (en) * | 2015-08-28 | 2015-11-18 | 长沙深湘通用机器有限公司 | Sorting equipment |
-
2016
- 2016-08-17 WO PCT/IB2016/054915 patent/WO2017029610A1/en active Application Filing
- 2016-08-17 ZA ZA2016/05691A patent/ZA201605691B/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2391150C1 (en) * | 2009-03-23 | 2010-06-10 | Общество с ограниченной ответственностью "Научно-производственная фирма "АЭРОМЕХ" (ООО "НПФ "АЭРОМЕХ") | Pneumatic system for installation of loose mixture air separation in fluid medium |
UA97423C2 (en) * | 2010-05-25 | 2012-02-10 | Володимир Степанович Сухін | Method and device for separating bulk material in flowing fluid |
RU2431529C1 (en) * | 2010-06-16 | 2011-10-20 | Владимир Степанович Сухин | Method of separating loose mix in fluid and device to this end |
CN105057205A (en) * | 2015-08-28 | 2015-11-18 | 长沙深湘通用机器有限公司 | Sorting equipment |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107899035A (en) * | 2017-11-17 | 2018-04-13 | 魔水科技(北京)有限公司 | A kind of portable germicidal device |
CN109290239A (en) * | 2018-10-30 | 2019-02-01 | 夏士桀 | A kind of novel surface processing unit of new material manufacture field |
CN109877038A (en) * | 2019-03-07 | 2019-06-14 | 大同新成新材料股份有限公司 | A kind of agglomerated activated carbon screening plant |
Also Published As
Publication number | Publication date |
---|---|
ZA201605691B (en) | 2017-08-30 |
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