GB2493600A - Apparatus and methods for recovering polyolefin plastic - Google Patents
Apparatus and methods for recovering polyolefin plastic Download PDFInfo
- Publication number
- GB2493600A GB2493600A GB1211431.0A GB201211431A GB2493600A GB 2493600 A GB2493600 A GB 2493600A GB 201211431 A GB201211431 A GB 201211431A GB 2493600 A GB2493600 A GB 2493600A
- Authority
- GB
- United Kingdom
- Prior art keywords
- text
- polyolefin
- size
- source mixture
- decanter centrifuge
- 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- Withdrawn
Links
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000004033 plastic Substances 0.000 title claims abstract description 19
- 229920003023 plastic Polymers 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 40
- 238000005054 agglomeration Methods 0.000 claims abstract description 22
- 230000002776 aggregation Effects 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000002699 waste material Substances 0.000 claims description 34
- 238000004064 recycling Methods 0.000 claims description 15
- 239000000356 contaminant Substances 0.000 claims description 11
- 239000000123 paper Substances 0.000 claims description 11
- -1 polypropylene Polymers 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 238000004513 sizing Methods 0.000 claims description 8
- 239000010791 domestic waste Substances 0.000 claims description 6
- 239000002906 medical waste Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005549 size reduction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 239000000047 product Substances 0.000 description 3
- 239000003473 refuse derived fuel Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 150000001398 aluminium Chemical class 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- 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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0203—Separating plastics from plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0217—Mechanical separating techniques; devices therefor
- B29B2017/0231—Centrifugating, cyclones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0279—Optical identification, e.g. cameras or spectroscopy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2311/00—Use of natural products or their composites, not provided for in groups B29K2201/00 - B29K2309/00, as reinforcement
- B29K2311/12—Paper, e.g. cardboard
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Apparatus for use in the recovery of polyolefin plastic comprises; a three-phase decanter centrifuge means, using water as its liquid medium and an agglomeration means; wherein the three-phase decanter centrifuge means is upstream from the agglomeration means, and the centrifuge separates the polyolefin material from the source mixture such that the polyolefin material is then fed into the agglomeration means. The apparatus may be heated to 60-99.9 oC and may contain a size control means. The size control means may limit the size of material entering the centrifuge to 25 mm or less and may comprise; a screen, filter or means for reducing the size of the source material. A method of use for the apparatus is also disclosed.
Description
Method of recovering Polyolefin from Waste and Recycling Operations This invention relates to apparatus and methods for recovering, ideally for reuse, polyolefin plastic, for example polyethylene (PE) and polypropylene [PP), from residues or by-products, for example from other recycling or waste treatment processes. The method is particularly applicable to low bulk density plastics with a high surface area.
When paper, cardboard, or structured (laminated aluminium foil, paper and plastic) material, is recycled, by a paper mill, a plastic waste stream may be produced because of the plastic contamination introduced with the paper or multilayer material. When medical plastic is cleaned and sterilised or municipal waste is autoclaved a plastic mix is also be produced. These streams can often be wet and can contain varying amounts of contaminants, for example, cellulose fibre, metals, dirt and other residue. It will be noted that although such waste streams consist of a mixture of plastics types in general the plastics mix most suitable for processing by this method will contain mostly polyolefins.
Conventionally further recovery of materials from the waste stream is difficult, and as a result these streams are considered waste, which, might, for example be burnt as part of the recycling plant to generate power, converted to Refuse Derived Fuel [RDF) for burning elsewhere or landfilled. Such methods of disposal may be costly (for example, the cost of landfill] or may simply fail to derive the value that would be derived were the plastic separated and then sold.
In certain circumstances, the individual plastics may be recovered as part of the primary recycling process, but this typically is only possible for very large and complex plants that are very expensive and require a large amount of recycling input Such methods are expensive multistep methodologies. Furthermore, it is not typically possible to retrofit the apparatus used for these techniques to existing plants, and therefore any plants currently producing such waste streams are not candidates for such treatment.
It will be seen therefore that a technique or method that allowed for the recovery of the plastics (polyo]efins), from the waste stream would be very beneficial in terms of reducing the cost associated with disposing of the waste stream, or creating additional value to the recycling process by allowing more material to be recycled. It will also be seen that a technique that allows such recovery to be performed on existing plants would be very beneficial.
It is an object of the invention to * Recover polyolefin plastics from waste streams deriving from the recycling of paper, cardboard and/or structured material.
* Recover polyolefin plastics from waste streams deriving from the residues generated by autoclaving medical or household waste.
According to a first aspect, this invention comprises apparatus for use in the recovery of polyolefin plastics from a source mixture wherein the apparatus comprises; * a three-phase decanter centrifuge means, using water as its liquid medium * an agglomeration means wherein the three phase decanter centrifuge means is upstream from the aggLomeration means, and said three phase decanter centrifuge separates the polyolefin material from the source mixture such that the separated polyolefin material is then fed into the agglomeration means.
Advantageously the apparatus allows for a simple two step recovery of polyolefin material from a source mixture such as papermill sludge from the recycling of paper, cardboard and/or structured material or from waste streams deriving from residues generated by autoclaving medical or household waste. The apparatus has both a small footprint and low energy consumption which allows easy retrofitting into existing recycling plants and low cost and environmental impact.
Optionally the apparatus, at least in part, is heated to temperatures of 60°C or greater.
Preferably the apparatus, at least in part, is heated to temperatures of between 60°C or 99.9°C.
Most preferably the apparatus, at east in part, is heated to temperatures of between 60°C or 9 5°C.
By running the apparatus at a higher temperature than traditional standalone three-phase decanter centrifuge means are run this allows both the polyolefin output stream and the contaminant output stream to be produced with a low moisture content This has the benefit that the polyolefin material is effectively dry when it is fed into the agglomeration means.
Preferably the apparatus also comprises; * a size control means.
The size control means is positioned upstream from the three phase decanter centrifuge means and ensures that the source mixture is of a suitable size for the centrifuge.
Generally the size control means acts to limit the size of material that enters the three phase decanter centrifuge means to 25mm or less.
Optionally the size control means comprises a screen or filter to prevent entry of excessively large components into the centrifuge.
Optionally the screen or filter vibrates.
Alternatively or in addition, the size control means may comprise means for reducing the size of the components of the source mixture or can be a combination of both.
Optionally the means for reducing the size of the components of the source mixture are one or more of a single shaft shredder, a twin shaft shredder, a granulator, a guillotine or a mill.
Preferably the source mixture is a waste streams derived from the recycling of paper, cardboard and/or structured material.
Typically the screen or filter and the means for reducing the size of the components of the source mixture are integrated together as a single unit.
Alternatively the source mixture is a waste stream derived from the residues generated by autoclaving medical or household waste.
Both of the source mixtures typically have significant amounts of polyolefin mixed with other waste or contaminants.
Preferably the apparatus also comprises; a belt sorter which is positioned downstream from the three phase decanter centrifuge means and is adapted to extract polypropylene from the polyolefin materiaL Preferably the belt sorter is an near infra red (NIR] belt sorter.
The belt sorter allows further refinement and processing of the polyolefin into constituent parts such as polypropylene and polyethylene. This allows for high grade plastic recovery. The NIR sorter blows out the polypropylene from the recovered polyolefin such that it can be separately processed.
Preferably the agglomeration means compresses or increases the density of the polyolefin material or components thereof.
According to a second aspect, this invention comprises Using a three-phase decanter centrifuge means, using water is its liquid medium, to recover polyolefins from paper and structured materials waste streams.
The second aspect relates to a method for recovering poyolefin from a source mixture, comprising the steps of introducing a source mixture into a three-phase decanter centrifuge means which uses water as its liquid medium; separating by density the source mixture into a polyolefin output stream and a contaminant waste stream; feeding the polyolefin output stream into an agglomeration means to agglomerate the polyolefin material.
Advantageously this method allows for a simple two step process where polyolefin plastics are easily and cost effectively extracted from waste material such as papermill sludge and agglomerated for economic transport and sale.
Optionally the method comprises the step of heating the three phase decanter centrifuge means to a temperature of 60°C or greater. Preferably the three phase decanter centrifuge means is heated to temperatures of between 60°C and 99.9°C. Most preferably the three phase decanter centrifuge means is heated to temperatures of between 60°C and 95°C.
Optionally the polyolefin output stream is heated to a to a temperature of 60°C or greater.
Preferably the polyolefin output stream is heated to temperatures of between 60°C and 99.9°C.
Most preferably the polyolefin output stream is heated to temperatures of between 60°C and 95°C.
Heating the three phase decanter centrifuge and/or the polyolefin output stream results in the polyolefin output having a low moisture content before it is agglomerated making processing easier and more cost effective and energy efficient Optionally the method also comprises an initia' sizing step of ensuring the source mixture does not contain pieces of material of excessive size.
Preferably the sizing step ensures that the source material contains particles or pieces of material no larger than 25 mm.
Optionally the sizing step is a filtering step where particles of a size greater than 25mm are removed, Alternatively, or in addition to the filtering step, the sizing step is an active size reduction step where particles of excess size are physically recued in size by milling, grinding, cutting or other physical means.
Preferably the source mixture is a waste streams derived from the recycling of paper, cardboard and/or structured materiaL.
Alternatively the source mixture is a waste stream derived from the residues generated by autoclaving medical or household waste.
Both of the source mixtures typically have significant amounts of polyolefin mixed with other waste or contaminants.
Optionally the method comprises a refinement step whereby after separating the source mixture by density the source mixture into a polyolefin output stream and a contaminant waste stream, the polyoleuin output stream is further refined by extracting polypropylene and or polyethylene for separate further processing and agglomeration.
The invention will be described by way of example and with reference to the accompanying drawings in which: Figure 1 shows the process flow sheet.
Figure 1 shows the process flow sheet comprising size control means (A), itself comprising an optional size-reduction unit and a screen, three-phase decanter centrifuge means (B), an agglomeration means (C).
The size control unit ensures that the material is of a suitable size for the centrifuge. This stage is optional since some material will be sized correctly already.
The three-phase centrifuge extracts and dries all the floating polyolefins ready to be fed to the agglomeration unit It may also dry and reject the sinking residue. In a waste stream that includes laminated aluminimum, this sinking residue may also include an aluminium product suitable for smelting. Two types of three phase centrifuges are suitable for this stage, the Flottweg SorticanterTM and the Andritz CensorTM.
The agglomeration unit densifies the polyolefin mixture for economic transport and sale, for example melt extrusion, agglomeration in a Condux mill or similar, baling, briquetting or pelletising in a pellet mill.
The centrifuge can be blocked by pieces that are too large so it is important that material is presented correctly (typically 25mm or less), and the size control unit if effective to ensure material is presented correctly. Some material is generated in this size range and thus the Screen is only for protection. Some materials will need to be made smaller and the size reduction unit will do this. This unit can be selected depending on the material and can be a single or twin shaft shredder, granulator, mill or guillotine. The screen can be static or vibratory or be an integrated screen in the shredder, granulator or mill, for example.
Material from section A is fed to the three phase decanter centrifuge also called a sorting centrifuge. This commercially available unit uses a liquid medium and high gravity to sort material by density and then dry it While a wide variety of liquids can be used in a three-pahse decanter centrifuge, a key feature of this invention is that water is used as the liquid medium.
To understand the invention more fully, it should be considered that an particular features of paper waste stream, derived waste streams and waste streams derived form similar structured material is that of the elements in the waste stream, in general only the polyolefin floats, while all or nearly all of the other contaminants typically sink in water.
It will therefore be understood that operation of the three-phase centrifuge using water as the liquid medium on such waste streams will serve to separate the polyolefins from the rest of the contaminants.
In an extension to the embodiment, the unit may be run hotter [60-95°C) than is typical of this system [40-55 °C). When done so, both the polyolefin output stream and the contaminant output stream can be produced with a low moisture content making it easier for further recycling. In most recycling processes drying of thin film products and cellulose residue is expensive. But if the material is not dried then further value added processing is much harder.
This process uses low incrementil heat combined with the centrifugal drying to dry even the polyolefin film and cellulose or aluminium film waste. Where disposa' is necessary there is a further commercial advantage that the residue will be dry saving landfill cost or improving the Calorific Value in RDF.
The dry floats (polyolefins) are fed to the agglomeration section. The products produced at this stage have a very low bulk density and are therefore not suitable for onward sale. It is necessary to increase their density to a commercially viable level, and the agglomeration section performs this task.
Optionally, if further refinement of the polyolefin material is required an additional refinement step can be incorporated before agglomeration. The apparatus may be provided with an optional belt sorter such as a near infra red (NIR) sorter which blows out the polypropylene element of the polyolefin stream for separate processing from, for example, the polyethylene component It will be understood that the combined units combined units described require a much smaller operating footprint than other recovery means and so can be easily retrofitted into existing plants.
Claims (1)
- <claim-text>Claims 1. Apparatus for use in the recovery of polyolefin plastics from a source mixture wherein the apparatus comprises; a three-phase decanter centrifuge means, using water as its liquid medium an agglomeration means wherein the three phase decanter centrifuge means is upstream from the agglomeration means, and said three phase decanter centrifuge separates the polyolefin material from the source mixture such that the separated polyolefin materia' is then fed into the agglomeration means.</claim-text> <claim-text>2. Apparatus as in Claim 1 which1 at least in part, is heated to temperatures of 60°C or greater.</claim-text> <claim-text>3. Apparatus as in Claim 1 which, at least in part, is heated to temperatures of between 60°C and 99.9°C.</claim-text> <claim-text>4. Apparatus as in Claim 1 which, at least in part, is heated to temperatures of between 60°C and 95°C.</claim-text> <claim-text>5. The apparatus of any of the previous claims further comprising a size control means.</claim-text> <claim-text>6. The Apparatus of claim 5 wherein the size control means is positioned upstream from the three phase decanter centrifuge means and ensures that the source mixture is of a suitable size for the centrifuge means.</claim-text> <claim-text>7. The Apparatus of claims 5 or 6 wherein the size control means acts to limit the size of material that enters the three phase decanter centrifuge means to 25mm or less.</claim-text> <claim-text>8. The Apparatus of any of claims 5 to 7 wherein the size control means comprises a screen or filter to prevent entry of excessively large components into the centrifuge means.</claim-text> <claim-text>9. The Apparatus of any of claims 5 to 8 wherein the size control means comprises means for reducing the size of the components of the source mixture.</claim-text> <claim-text>10. The Apparatus of claim 9 wherein the means for reducing the size of the components of the source mixture are one or more of a single shaft shredder, a twin shaft shredder, a granulator, a guillotine or a mill.</claim-text> <claim-text>11. Typically the screen or filter and the means for reducing the size of the components of the source mixture are integrated together as a single unit 12. The Apparatus of any of the previous claims wherein the source mixture is a waste streams derived from the recycling of paper, cardboard and/or structured material.13. The Apparatus of any of claims 1 to 11 wherein the source mixture is a waste stream derived from the residues generated by autoclaving medical or household waste.14. The Apparatus of any of the previous claims further comprising; a belt sorter which is positioned downstream from the three phase decanter centrifuge means and is adapted to extract polypropylene from the polyolefin material.15. The Apparatus of claim 14 wherein the belt sorter is an near infra red (NIR) belt sorter.16. A method for recovering poyolefin from a source mixture, comprising the steps of; introducing a source mixture into a three-phase decanter centrifuge means which uses water as its liquid medium; separating by density the source mixture into a polyolefin output stream and a contaminant waste stream; feeding the polyolefin output stream into an agglomeration means to agglomerate the polyolefin material.17. The method of Claim 16 further comprising the step of heating the three phase decanter centrifuge means to a temperature of 60°C or greater.18. The method of Claim 16 further comprising the step of heating the three phase decanter centrifuge means to a temperature of between 60°C and 99.9°C.19. The method of Claim 16 further comprising the step of heating the three phase decanter centrifuge means to a temperature of between 60°C and 95CC.20. The method of any claims 16 to 19 further comprising the step of heating the polyolefin output stream to a temperature of 60°C or greater.21. The method of any claims 16 to 19 further comprising the step of heating the polyolefin output stream to a temperature of between 60°C or 99.9°C.22. The method of any claims 16 to 19 further comprising the step of heating the polyolefin output stream to a temperature of between 60°C or 95°C.23. The method of any claims 16 to 22 further comprising an initial sizing step of ensuring the source mixture does not contain pieces of material of excessive size.24. The method of claim 23 wherein the sizing step ensures that the source material contains particles or pieces of material no larger than 25mm.25. The method of any claims 23 or 24 wherein the sizing step is a filtering step where particles of a size greater than 25mm are removed, 26. The method of any claims 23 to 25 wherein the sizing step is an active size reduction step where particles of excess size are physically recued in size by milling, grinding, cutting or other physical means.27. The method of any claims 16 to 26 wherein the source mixture is a waste streams derived from the recycling of paper, cardboard and/or structured material.28. The method of any claims 16 to 26 wherein the source mixture is a waste stream derived from the residues generated by autoclaving medical or household waste.29. The method of any claims 16 to 28 wherein the method further comprises a refinement step whereby after separating the source mixture by density the source mixture into a polyolefin output stream and a contaminant waste stream, the polyolefin output stream is further refined by extracting poypropy1ene and or po1yethyene for separate further processing and agglomeration.</claim-text>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201110797A GB201110797D0 (en) | 2011-06-27 | 2011-06-27 | Method of recovering polyolefin from waste and recycling operations |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201211431D0 GB201211431D0 (en) | 2012-08-08 |
| GB2493600A true GB2493600A (en) | 2013-02-13 |
Family
ID=44485157
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB201110797A Ceased GB201110797D0 (en) | 2011-06-27 | 2011-06-27 | Method of recovering polyolefin from waste and recycling operations |
| GB1211431.0A Withdrawn GB2493600A (en) | 2011-06-27 | 2012-06-27 | Apparatus and methods for recovering polyolefin plastic |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB201110797A Ceased GB201110797D0 (en) | 2011-06-27 | 2011-06-27 | Method of recovering polyolefin from waste and recycling operations |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB201110797D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103349867A (en) * | 2013-07-15 | 2013-10-16 | 河南卷烟工业烟草薄片有限公司 | Paper-making process reconstituted tobacco papermaking white water reuse treatment method |
| GB2508592A (en) * | 2012-12-03 | 2014-06-11 | James Alexander Donaldson | Method and apparatus for recovering polyolefin |
| EP2823945A3 (en) * | 2013-07-10 | 2015-04-22 | mtm plastics GmbH | Method and device for recovery of plastic waste |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1020227A1 (en) * | 1999-01-18 | 2000-07-19 | Baker Hughes (Deutschland) GmbH | Centrifuge for the wet mechanical separation of solid mixtures |
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2011
- 2011-06-27 GB GB201110797A patent/GB201110797D0/en not_active Ceased
-
2012
- 2012-06-27 GB GB1211431.0A patent/GB2493600A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1020227A1 (en) * | 1999-01-18 | 2000-07-19 | Baker Hughes (Deutschland) GmbH | Centrifuge for the wet mechanical separation of solid mixtures |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2508592A (en) * | 2012-12-03 | 2014-06-11 | James Alexander Donaldson | Method and apparatus for recovering polyolefin |
| GB2508592B (en) * | 2012-12-03 | 2016-12-07 | Alexander Donaldson James | Method for recovering polyolefin from waste and recycling operations |
| EP2823945A3 (en) * | 2013-07-10 | 2015-04-22 | mtm plastics GmbH | Method and device for recovery of plastic waste |
| CN103349867A (en) * | 2013-07-15 | 2013-10-16 | 河南卷烟工业烟草薄片有限公司 | Paper-making process reconstituted tobacco papermaking white water reuse treatment method |
| CN103349867B (en) * | 2013-07-15 | 2015-04-01 | 河南卷烟工业烟草薄片有限公司 | Paper-making process reconstituted tobacco papermaking white water reuse treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201110797D0 (en) | 2011-08-10 |
| GB201211431D0 (en) | 2012-08-08 |
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