Method and plant for plastics processing

Abstract

The invention relates to a method and a plant (2) for carrying out this method for processing a target sorting fraction (1) with a polyolefin content of at least 80 m%, in particular of at least 90 m%, from a waste fraction (3) for further chemical and / or mechanical recycling of the target sorting fraction (1). The method comprises feeding a first mixed plastics fraction (4) and optionally additionally a second mixed plastics fraction (5) to a comminution device (7) and comminuting or homogenising said fraction(s) by means of a comminution device. The method further comprises the metal separation (12) of ferrous impurities (13) and / or magnetisable impurities (16), the impurity separation (19) of a first heavy fraction (20) and the fine separation (26) of a second heavy fraction (27), wherein the plant (2) comprises corresponding plant components for carrying out the method.

Description

[0001] PROCESS AND PLANT FOR PLASTICS PROCESSING

[0002] The invention relates to a method for processing, in particular for predominantly mechanical but partly also chemical processing, of a target sorting fraction with a polyolefin content of at least 80%, in particular of at least 90%, from a waste fraction for further chemical and / or mechanical recycling of the target sorting fraction.

[0003] With the introduction of recycling quotas for plastic packaging, the need to also treat waste fractions that previously could not be subjected to mechanical recycling processes and therefore had to be thermally recycled has become clear. Various chemical recycling processes are possible for some of these fractions. In particular, trials with fractions with varying polyolefin content have shown that resource- and energy-efficient processing of these waste fractions is only possible if they have a polyolefin content of more than 80 wt%, or especially more than 80 wt%, a contaminant content of less than 7 wt%, and a moisture content of less than 20%, especially less than 15%.

[0004] According to the current state of the art, only sorting fractions that are already processed in mechanical recycling meet these criteria. Sorting residues from mechanical recycling or mixed plastics fractions cannot meet these limits or those required for mechanical recycling, such as a purity of more than 95%. Since these fractions, i.e., sorting residues and mixed plastics fractions, are therefore primarily used for thermal recycling, these quantities are not counted towards achieving the highest possible recycling rate. Therefore, from both an environmental and economic perspective, it makes sense to further process precisely these fractions, namely sorting residues and mixed plastics fractions, into a target sorting fraction and to feed this target sorting fraction into subsequent chemical recycling.Due to the high energy consumption and material losses that occur during chemical recycling, and the associated costs, the precursors—i.e., sorting residues and mixed plastic fractions—used to prepare a target sorting fraction for chemical recycling are cheaper than the precursors for mechanical recycling. However, to ensure the economic viability of such an increased recycling rate, the processing of a target sorting fraction for chemical and / or mechanical recycling of plastics must be implemented as cost-effectively as possible.

[0005] Sorting and separation processes for processing waste fractions or plastic fractions are known from EP 2750812 B1 or WO 0067977 A1. These known sorting and separation processes have the disadvantage that, on the one hand, specific precursors and mixing ratios of the precursors are required to carry out the process, and, on the other hand, that the resulting target sorting fractions are already further processed or, with regard to chemical purity, are too unspecific for subsequent chemical and / or mechanical recycling.

[0006] The object of the present invention was to overcome the disadvantages of the prior art and to provide a process and a plant for carrying out the process, by means of which process a target sorting fraction with a high proportion of polyolefins and a low proportion of impurities can be processed from sorting residues and mixed plastics fractions or other waste or plastics waste fractions in the most cost-effective way possible, with regard to chemical purity.

[0007] This object is achieved by a method and a system for carrying out the method according to the claims.

[0008] The method according to the invention is used for processing, in particular for predominantly mechanical but also optionally partially chemical processing, of a target sorting fraction with a polyolefin content of at least 80 m%, in particular of at least 90 m%, from a waste fraction for further chemical and / or mechanical recycling of the target sorting fraction, wherein the waste fraction comprises a first mixed plastics fraction from the sorting of plastics waste from municipal and / or commercial waste collection systems, such as sorting residues from the lightweight packaging sorting, in particular of lightweight packaging or a lightweight packaging sorting, and a second mixed plastics fraction from the sorting of residual or commercial waste.

[0009] The first mixed plastic fraction can have a proportion of polyolefins in the range of 50 m% to 70 m%, a grain size in the range of 20 mm to 600 mm, a proportion of metallic impurities in the range of up to 10 m% and a proportion of biogenic substances, minerals or other impurities, such as other plastics, of up to 40 m%.

[0010] The second mixed plastics fraction can have a polyolefin content of less than 20 m%, a grain size of up to 50 mm due to pre-crushing, a metallic contaminant content of up to 5 m% and a biogenic substance, minerals or other contaminants content of up to 75 m%.

[0011] The method according to the invention comprises the following successive, but not necessarily directly successive, process steps:

[0012] - feeding the first mixed plastic fraction and possibly, but not necessarily, the second mixed plastic fraction to a shredding device;

[0013] - crushing and, if necessary, mixing the first mixed plastic fraction and the second mixed plastic fraction by means of the crushing device;

[0014] - Transporting the waste fraction by means of a third conveyor device and simultaneously separating metal from ferrous contaminants and / or magnetisable contaminants from the waste fraction, so that a metal-free waste fraction is provided for the further process steps;

[0015] The procedure also includes the following further procedural steps, which follow one another but do not necessarily follow one another directly:

[0016] - Impurities - Separation of non-plastic impurities or impurities that contain a predominant proportion of substances with a density of more than 1 g / cm 3 , especially more than 1.8 g / cm 3 , and having a grain size in the range from 3 mm to 8 mm, in particular from 3 mm to 6 mm, from the waste fraction by means of a separation device, wherein during the separation of the contaminants a first heavy fraction is separated and removed and thus a good fraction is provided for the further process steps;

[0017] - Transporting the waste fraction or the now processed good fraction to a pre-silo or to a pre-container or a buffer container and buffering the waste fraction in the pre-silo;

[0018] - Feeding the waste fraction buffered in the pre-silo or the now processed good fraction to a hydrocyclone;

[0019] - Fine separation of plastic granules with adhering or fixed non-plastic contaminants and plastics with a density of more than 1 g / cm 3 from the waste fraction or from the good fraction by means of the hydrocyclone by a wet process using a liquid, whereby a second heavy fraction is separated and removed;

[0020] - Discharge of the target sorting fraction from the hydrocyclone.

[0021] By applying a wet process in the hydrocyclone, the processable fractions are also washed, which advantageously reduces odor formation during further storage or processing of the second heavy fraction and the target sorting fraction. As an alternative to a hydrocyclone, a decanter can also be used for this process step. In any case, the hydrocyclone or decanter can be used to perform friction washing with a force acting on the good fraction in the range of 750 g to 2000 g. To increase the longevity of the hydrocyclone or decanter or to extend the intervals between necessary maintenance intervals, the good fraction can be arranged or designed upstream of the hydrocyclone or decanter in a mash tank for further separation of heavy impurities.

[0022] The sequence of the sorting and separation steps of the inventive method is not mandatory. However, the sequence of sorting and separation steps of the inventive method proves to be particularly advantageous with regard to the quality of the target sorting fraction that can be processed thereby, so that the requirements for subsequent chemical and / or mechanical recycling of the target sorting fraction are met. It is particularly advantageous if the impurity separation, for example by means of drum dryers, precedes the fine separation using a hydrocyclone, since this allows for a higher throughput of the waste fraction compared to the reverse sequence.

[0023] The advantage of the method according to the invention is that, in particular, the first mixed plastics fraction and the second mixed plastics fraction, as described above, can be mechanically processed in a simple manner in such a way that, on the one hand, the impurity fractions, comprising a metallic impurity fraction, the first heavy fraction and the second heavy fraction can be separated and removed from the waste fraction and, on the other hand, that the required composition of the target sorting fraction is achieved at the end of the method.By appropriately sequencing the process steps of the inventive process, the contaminant fractions and the target sorting fraction can be separated particularly economically, so that the waste fraction previously usable only through thermal recycling can now be further processed in a value-added manner, since at least the target sorting fraction can be made available for chemical and / or mechanical recycling. This is achieved in particular by the inventive sequencing of the individual process steps, since the required quality of the target sorting fraction can thus be achieved in a resource-saving and energy-efficient manner—namely, a polyolefin content of at least 80 wt% or, in particular, at least 90 wt%, and a contaminant content of less than 7 wt%.

[0024] Furthermore, it may be expedient if the first mixed plastic fraction is continuously fed to the shredding device in the form of compressed and / or agglomerated bales by means of a first conveying device.

[0025] Municipal plastic waste is typically collected and pre-sorted to form the first mixed plastics fraction, possibly as the sorting residue of municipal plastic waste. Pre-sorting can be performed at a different location than the further processing to produce the desired target sorting fraction. Since the first mixed plastics fraction must be easy and economical to transport, it is usually produced in the form of bales, which can advantageously be processed directly using the method according to the invention.Since the first mixed plastics fraction can comprise the predominant proportion of the waste fraction, since this first mixed plastics fraction can have a higher proportion of polyolefins relative to the second mixed plastics fraction, it is advantageous to feed these to the shredding device in compressed bales, since in this way the highest possible throughput for processing the target sorting fraction can be achieved with a comparably small or simple dimensioning of the first conveying device compared to loose fractions.

[0026] Furthermore, it can be provided that the second mixed plastic fraction is continuously fed in loose form to the shredding device by means of a second conveying device. This second conveying device can be formed, for example, by a conveyor belt. This easily achieves improved dosing of the second mixed plastic fraction, so that the end product of the process, namely the target sorting fraction, can be varied as easily as possible with regard to its quality. In this context, it should be noted that the second mixed plastic fraction is not mandatory, and its feed can be temporarily interrupted.

[0027] Furthermore, it can be provided that for the waste fraction, during shredding and, if necessary, mixing of the first mixed plastics fraction and the second mixed plastics fraction by means of the shredding device, a proportion of the second mixed plastics fraction in the range of 5 m% to 20 m% is set by adjusting the conveying speed of the second conveying device. Since the proportion of polyolefins in the first mixed plastics fraction can at best be estimated, the range of the proportion of polyolefins in the target sorting fraction is subsequently limited by defining the range for the proportion of the second mixed plastics fraction. In this way, the quality of the target sorting fraction can also be easily maintained within a range that is necessary for chemical recycling. This reduces or eliminates any possible exclusion of the target sorting fraction.avoided entirely, since the proportion of polyolefins will anyway be within the intended range.

[0028] Another advantageous embodiment is one in which the waste fraction is crushed in the crushing device to a grain size of no more than 25 mm, with the crushing device being designed to also crush impurities to a grain size of no more than 25 mm. This easily improves the effectiveness of separating impurities in the process steps following crushing and mixing, particularly during metal separation. This, in turn, leads to a higher yield of target sorting fraction per waste fraction introduced, which improves the economic efficiency of the process.

[0029] According to a further development, it is possible for the metal separation of ferrous contaminants to be carried out using an overbelt magnet device, wherein the method further comprises eddy current separation of magnetizable contaminants in an eddy current separator immediately downstream of the third conveyor device. This creates the possibility of separating ferrous contaminants and non-ferrous but magnetizable contaminants into separate fractions. These fractions can thus be subjected to further material recycling, which in turn improves the overall economic efficiency of the process. Furthermore, it can be expedient if the first heavy fraction is separated during the contaminant separation using the separation device comprising several drum dryers arranged parallel and / or serially with respect to the transport of the waste fraction.The first heavy fraction, which is cleaned or separated in the drums, is suitable as a fuel in cement plants due to its high proportion of biogenic materials and its fine, fibrous consistency. The mineral content can be incorporated into clinker and subsequently processed into cement, thus making it suitable for material recycling. This, in turn, improves the overall economic efficiency of the process, as a further impurity fraction can be separated in such a way that it can be reused.

[0030] Furthermore, the liquid used in the hydrocyclone can be predominantly water, with the liquid being circulated during continuous operation of the process and continuously purified or reprocessed by filtration, pH adjustment, and / or heavy metal removal using a treatment device. This is advantageous in that the resource consumption for the process for separating the first target sorting fraction is minimized, which in turn improves economic efficiency and also protects the environment.

[0031] Furthermore, it can be provided that additives comprising salts, ethanol, oils, acids, alkalis, detergents and / or defoamers are added to the liquid used in the hydrocyclone, whereby the additives are primarily added to adapt the pH value and to adjust the density of the liquid. This can ensure that the recycling of the liquid in the hydrocyclone can be maintained for longer and, synergistically, that the cleaning or washing of the fractions processed in the hydrocyclone is improved. This makes the process more resource-efficient and economical. Adjusting the density can be relevant for the separation efficiency and enables a response to new types of plastics. Other parameters relevant to the separation efficiency are the speed, acceleration and grain size of the material.

[0032] The invention further relates to a plant for carrying out the method described above for processing a target sorting fraction with a proportion of polyolefins of at least 80 m%, in particular of at least 90 m%, from a waste fraction for further chemical and / or mechanical recycling of the target sorting fraction, wherein the waste fraction comprises at least a first mixed plastics fraction from the sorting of municipal and / or commercially generated plastics waste, in particular of lightweight packaging or a lightweight packaging sorting, and optionally also a second mixed plastics fraction from the sorting of residual or commercial waste.

[0033] The system includes the following components:

[0034] - a shredding device for shredding and, if necessary, mixing the waste fraction;

[0035] - a first conveyor device for feeding the first mixed plastic fraction to the shredding device in the form of compressed and / or agglomerated bales;

[0036] - a second conveyor device for feeding the second mixed plastic fraction to the shredding device in loose form;

[0037] - a third conveyor device for transporting the waste fraction and an overband magnet device for separating metallic contaminants from the waste fraction;

[0038] - an eddy current separator for the separation of non-ferrous metal contaminants from the waste fraction;

[0039] - a separation device comprising at least one drum dryer or alternatively, but not necessarily, several drum dryers arranged parallel and / or serially with respect to the transport of the waste fraction;

[0040] - a pre-silo for buffering the waste fraction; and

[0041] - a hydrocyclone for fine separation.

[0042] The plant is characterized by the fact that the shredding device, the third conveyor device with the overband magnet device, the eddy current separator, the separating device, the pre-silo and the hydrocyclone can be sequentially passed through by the waste fraction formed from the first mixed plastics fraction and, if necessary, also from the second mixed plastics fraction.

[0043] - whereby ferrous metals can be separated and removed by means of the overband magnet device and non-ferrous metals can be separated and removed by means of the eddy current separator, so that a metal-free waste fraction can be provided to the subsequent plant components,

[0044] - wherein at least one screen basket of the drum dryer or the screen baskets of the drum dryer of the separating device have perforations in the range of 3 mm to 8 mm, in particular from 3 mm to 6 mm, for the separation of non-plastic contaminants or of contaminants which contain a predominant proportion of substances with a density of more than 1 g / cm 3 , especially more than 1.8 g / cm 3 and having a grain size in the range of 3 mm to 8 mm from the metal-free waste fraction, wherein a first heavy fraction can be separated or removed by means of the separation device and a good fraction can be provided for the subsequent plant components,

[0045] - the good fraction can be stored or buffered in the pre-silo so that a continuous supply of the good fraction to the hydrocyclone can be provided,

[0046] - whereby by means of the hydrocyclone, by fine separation, in particular by friction washing with a force acting on the good fraction in the range between 750 g and 2000 g, plastic granules with adhering or fixed non-plastic contaminants and plastics with a density of more than 1 g / cm 3 can be separated and removed from the good fraction as a second heavy fraction and the target sorting fraction can be removed.

[0047] An advantage of the plant according to the invention for carrying out the method for processing a target sorting fraction is that in particular the first mixed plastics fraction and the second mixed plastics fraction, as described above, can be processed mechanically in a simple manner in such a way that, on the one hand, the impurity fractions, comprising an iron-containing impurity fraction, a magnetizable impurity fraction, the first heavy fraction and the second heavy fraction can be separated from the waste fraction and removed, and that, on the other hand, the required composition of the target sorting fraction can be removed or provided after the waste fraction has passed through the plant.By appropriately arranging the plant components of the plant according to the invention for carrying out the method for processing the target sorting fraction, the impurity fractions and the target sorting fraction can be separated particularly economically, so that the waste fraction that was previously only usable through thermal recycling can now be further processed in a value-added, resource-efficient, and economical manner, since at least the target sorting fraction can be made available for chemical and / or mechanical recycling. It is particularly advantageous if the impurity separation using the drum dryer(s) precedes the fine separation using the hydrocyclone, as this allows for a higher throughput of the waste fraction compared to the reverse sequence. Furthermore, the introduction of water-soluble substances into the water circuit of the hydrocyclone or decanter is reduced.This leads to improved water quality, thus to less effort in water treatment and thus to energy savings and reduced wear of the hydrocyclone or decanter.

[0048] This is achieved in particular by the inventive arrangement of the individual plant components, since the required quality of the target sorting fraction can thus be achieved in a resource-saving and energy-efficient manner, namely a proportion of polyolefins of at least 80 m% or in particular at least 90 m%, and a proportion of impurities of less than 7 m%.

[0049] According to a special design, the waste fraction can be reduced to a maximum particle size of 25 mm using the shredding device. This easily improves the effectiveness of removing impurities in the plant components or process steps following shredding and mixing, particularly during metal separation. This, in turn, leads to a higher yield of the target sorting fraction relative to the amount of waste fraction introduced, which improves the economic efficiency of the plant and thus also the process.

[0050] According to an advantageous development, the plant can further comprise a treatment device for the continuous treatment of a liquid used in the hydrocyclone by filtration, pH adjustment of the liquid, and heavy metal separation. This is advantageous because the resource consumption for operating the plant or for carrying out the process for separating the first target sorting fraction is minimized, which in turn improves the plant's economic efficiency and also protects the environment.

[0051] For a better understanding of the invention, it is explained in more detail using the following figures.

[0052] They show in a highly simplified, schematic representation:

[0053] Fig. 1 is a schematic representation of a possible sequence of the method according to the invention;

[0054] Fig. 2 is a schematic representation of a possible embodiment of a system for carrying out the method according to the invention. By way of introduction, it should be noted that in the variously described embodiments, identical parts are provided with identical reference symbols or identical component designations, whereby the disclosures contained in the entire description can be applied mutatis mutandis to identical parts with identical reference symbols or identical component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and in the event of a change in position, these positional information must be applied mutatis mutandis to the new position.

[0055] Fig. 1 shows a schematic representation of a possible sequence of the method according to the invention for the mechanical processing of a target sorting fraction 1. Furthermore, Fig. 2 shows a schematic representation of a possible embodiment of a system 2 for carrying out the method according to the invention, wherein the same reference numerals or designations as in Fig. 1 are used for the same parts.

[0056] To improve understanding of the possible sequence of the method according to the invention, individual sorting or separation process steps are marked with squares in Fig. 1, individual plant components of plant 2 with circles and individual fractions with hexagons.

[0057] As can be seen from Fig. 1 in conjunction with Fig. 2, the method is provided for the mechanical processing of the target sorting fraction 1, which target sorting fraction 1 can have a polyolefin content of at least 80 m%, in particular of at least 90 m%. The target sorting fraction 1 can thus be used economically for a chemical and / or mechanical recycling process. The target sorting fraction 1 can be processed from a waste fraction 3 by sorting or separation process steps of the method according to the invention, wherein the waste fraction 3 can comprise a first mixed plastics fraction 4 from the sorting of municipally generated plastics waste or from a sorting fraction of municipally generated plastics waste and a second mixed plastics fraction 5 from the sorting of residual or commercial waste or from a sorting fraction of residual or commercial waste.

[0058] In a first method step of the method according to the invention, the first mixed plastics fraction 4 can be fed to a comminution device 7 by means of a first conveyor device 6, wherein the first mixed plastics fraction 4 can be fed to the comminution device 7 in the form of compressed and / or agglomerated bales. Furthermore, the second mixed plastics fraction 5 can be fed to the comminution device 7 in loose form by means of a second conveyor device 9. The comminution device 7 can be configured to comminution the first mixed plastics fraction 4 and the second mixed plastics fraction 5 and to mix them in order to provide the waste fraction 3 for the further method steps.

[0059] It can be provided that a proportion of the second mixed plastic fraction 5 is adjusted by adjusting a conveying speed of the second conveying device 9 or alternatively also by adjusting a further conveying speed of the first conveying device 6, so that the proportion of the second mixed plastic fraction 5 of the waste fraction 3 can be set in the range from 5 m% to 20 m%.

[0060] Furthermore, the comminution device 7 can be designed to provide a grain size of at most 25 mm for the waste fraction 3 by comminution of the first mixed plastic fraction 4 and the second mixed plastic fraction 5, wherein also impurities such as metallic impurities can be comminuted to a grain size of at most 25 mm.

[0061] In a further process step of the method according to the invention, the now shredded and mixed waste fraction 3 can be transported away from the shredding device 7 or further transported by means of a third conveyor device 10. The system 2 further comprises an overband magnet device 11, which is operatively connected to or acts on the waste fraction 3 transportable by means of the third conveyor device 10, for separating 12 metallic impurities from the waste fraction 3. By means of the overband magnet device 11, in particular, iron-containing impurities 13 can be separated and removed from the waste fraction 3.

[0062] Plant 2 may further comprise an eddy current separator 14 for the eddy current separation 15 of magnetizable contaminants 16, so that non-ferrous metals as well as residual ferrous metals can be separated and removed from waste fraction 3. Thus, waste fraction 3 can be provided as a metal-free waste fraction 17 in plant 2 for the subsequent process steps.

[0063] In a further process step, the waste fraction 3 or the now metal-free

[0064] Waste fraction 17 is fed to a separating device 18 of the plant 2 in order to separate non-plastic contaminants or contaminants with a density of more than 1 g / cm from the waste fraction 3 or from the now metal-free waste fraction 17 by means of contaminant separation 19. 3 , especially more than 1.8 g / cm 3, and a grain size in the range of 3 mm to 8 mm and to discharge it as a first heavy fraction 20. The separation device 18 can comprise a plurality of drum dryers 22 arranged parallel and / or serially to one another with respect to the conveying direction 21 of the waste fraction 3 or the now metal-free waste fraction 17, wherein screen baskets of the drum dryers 22 can have perforations in the range of 3 mm to 8 mm for separating impurities 19 from the first heavy fraction 20. As a particularly advantageous embodiment, a drum dryer 22 can be designed with a screen basket which has a first section with perforations of 3 mm and a second section with perforations of 6 mm.By separating the contaminants 19 by means of the separating device 18, the first heavy fraction 20 can be separated and removed, so that the waste fraction 3 can be removed or made available as a good fraction 23 by means of the separating device 18 for further processing by means of the plant 2 through the subsequent process steps.

[0065] In a further subsequent process step, the waste fraction 3 or the good fraction 23 now processed by the previous sorting and separation process steps can be transported to a pre-silo 24 in order to buffer or temporarily store the good fraction 23 for subsequent process steps.

[0066] In a further subsequent process step, the waste fraction 3 temporarily stored in the pre-silo 24 or the now processed good fraction 23 can be fed to a hydrocyclone 25 for the fine separation 26 of plastics with adhering or fixed non-plastic contaminants and of plastics with a density of more than 1 g / cm 3from the waste fraction 3 or from the now processed good fraction 23 in order to separate and discharge a second heavy fraction 27. After separating and discharging the second heavy fraction 27 from the waste fraction 3 or from the good fraction 23 fed to the hydrocyclone 25, the remaining target sorting fraction 1 with a polyolefin content of at least 80 m%, in particular of at least 90 m%, can be discharged. It can be provided that the fine separation 26 is carried out by means of the hydrocyclone 25 in a wet process with a liquid. It can further be provided that the liquid predominantly comprises water, wherein the liquid is circulated during the continuous application of the process and is continuously cleaned and reprocessed or recycled by filtration, by adaptation of the pH value and / or by heavy metal separation by means of a processing device 28.undergoes wastewater treatment 29.

[0067] For the sake of clarity, it should finally be pointed out that, in order to better understand the structure, some elements have been shown out of scale and / or enlarged and / or reduced in size.

[0068] Reference symbol list

[0069] Target sorting fraction

[0070] Attachment

[0071] Waste fraction

[0072] First mixed plastics fraction

[0073] Second mixed plastics fraction

[0074] First conveyor shredding device bales

[0075] Second funding facility

[0076] Third conveyor overband magnet device metal separation

[0077] Iron-containing contaminants

[0078] Eddy current separator

[0079] Eddy current separation

[0080] Magnetizable contaminants Metal-free waste fraction

[0081] Separating device

[0082] S törnstoff- Ab scheide

[0083] First heavy fraction

[0084] Conveying direction

[0085] Drum dryer

[0086] Good faction

[0087] Pre-silo

[0088] Hydrocyclone

[0089] Fine separation

[0090] Second heavy fraction

[0091] Treatment device wastewater treatment

Claims

Patent claims 1. A method for processing a target sorting fraction (1) with a polyolefin content of at least 80 m%, in particular of at least 90 m%, from a waste fraction (3), wherein the waste fraction (3) can be composed of a first mixed plastics fraction (4) from the sorting of municipally generated plastics waste and possibly, but not necessarily, of a second mixed plastics fraction (5) from the sorting of residual or commercial waste, wherein the method comprises the following successive, but not necessarily directly successive, process steps: - feeding the waste fraction (3) to a shredding device (7); - comminuting the waste fraction (3) by means of the comminution device (7); - Transporting the waste fraction (3) by means of a third conveyor device (10) and simultaneously separating (12) ferrous impurities (13) and / or magnetizable impurities (16) from the waste fraction (3); characterized in that the method comprises the following successive, but not necessarily directly successive, process steps: - Separation of contaminants (19) of non-plastic contaminants or of contaminants containing a predominant proportion of substances with a density of more than 1 g / cm 3 , especially more than 1.8 g / cm 3 , and having a grain size in the range from 3 mm to 8 mm, in particular in the range from 3 mm to 6 mm, from the waste fraction (3) by means of a separating device (18), wherein a first heavy fraction (20) is removed during the impurity separation (19); - transporting the waste fraction (3) to a pre-silo (24) and buffering the waste fraction (3) in the pre-silo (24); - feeding the waste fraction (3) buffered in the pre-silo (24) to a hydrocyclone (25); - Fine separation (26) of plastic granules with adhering or fixed non-plastic contaminants and of plastics with a density of more than 1 g / cm 3 from the waste fraction (3) by means of the hydrocyclone (25) by a wet process using a liquid; - Discharge of the target sorting fraction (1) from the hydrocyclone (25).

2. Method according to claim 1, characterized in that the first mixed plastic fraction (4) of the shredding device (7) by means of a first conveyor device (6) is continuously fed in the form of compressed and / or agglomerated bales (8).

3. Method according to one of claims 1 or 2, characterized in that the second mixed plastic fraction (5) is continuously fed in loose form to the comminution device (7) by means of a second conveyor device (9).

4. Method according to one of claims 1 to 3, characterized in that for the waste fraction (3) during comminution and mixing of the first mixed plastic fraction (4) and the second mixed plastic fraction (5) by means of the comminution device (7), a proportion of the second mixed plastic fraction (5) in the range of 5 m% to 20 m% is set by adjusting a conveying speed of the second conveying device (9).

5. Method according to one of claims 1 to 4, characterized in that the waste fraction (3) is comminuted in the comminution device (7) to a grain size of at most 25 mm, wherein the comminution device (7) is designed so that impurities are also comminuted to a grain size of at most 25 mm.

6. Method according to one of claims 1 to 5, characterized in that the metal separation (12) of iron-containing impurities (13) is carried out by means of an overband magnet device (11), the method further comprising an eddy current separation (15) of magnetizable impurities (16) in an eddy current separator (14) immediately following the third conveyor device (10).

7. Method according to one of claims 1 to 6, characterized in that the first heavy fraction (20) is separated during the impurity separation (19) by means of the separation device (18) comprising a plurality of drum dryers (22) arranged parallel to one another and / or in series with respect to the conveying direction (21) of the waste fraction (3).

8. A method according to any one of claims 1 to 7, characterized in that the liquid used in the hydrocyclone (25) predominantly comprises water, the liquid being circulated during the continuous application of the method and is continuously cleaned and reprocessed by filtration, by adaptation of the pH value and / or by heavy metal separation by means of a treatment device (28) or subjected to wastewater treatment (29).

9. The method according to claim 8, characterized in that the additives comprising salts, ethanol, oils, acids, alkalis, detergents and / or defoamers are added to the liquid used in the hydrocyclone (25), the additives being added predominantly to adapt the pH value and to adjust the density.

10. Plant (2) for carrying out the method according to one of claims 1 to 9 for processing a target sorting fraction (1) with a polyolefin content of at least 80 m%, in particular of at least 90 m%, from a waste fraction (3) for further chemical and / or mechanical recycling of the target sorting fraction (1), wherein the waste fraction (3) comprises at least a first mixed plastics fraction (4) from the sorting of municipally generated plastics waste and optionally also a second mixed plastics fraction (5) from the sorting of residual or commercial waste, the plant (2) comprising the following plant components: - a comminution device (7) for comminuting the waste fraction (3); - a first conveyor device (6) for feeding the first mixed plastic fraction (4) to the comminution device (7) in the form of compressed and / or agglomerated bales (8); - a second conveyor device (9) for feeding the second mixed plastic fraction (5) to the shredding device (7) in loose form; - a third conveyor device (10) for transporting the waste fraction (3) and an overband magnet device (11) for separating (12) metal from iron-containing impurities (13) from the waste fraction (3); - an eddy current separator (14) for separating magnetizable impurities (16) from the waste fraction (3); - a separation device (18) comprising at least one drum dryer (22); - a pre-silo (24) for buffering the waste fraction (3); and - a hydrocyclone (25) for fine separation (26); characterized in that the comminution device (7), the third conveying device (10) with the Overband magnet device (11), the eddy current separator (14), the separating device (18), the pre-silo (24) and the hydrocyclone (25) can be passed through sequentially by the waste fraction (3), - wherein iron-containing impurities (13) can be separated and removed by means of the overband magnet device (11) and magnetizable impurities (16) can be separated and removed by means of the eddy current separator (14), so that a metal-free waste fraction (17) can be provided to the subsequent plant components, - wherein at least one screen basket of the drum dryer (22) of the separating device (18) has perforations in the range of 3 mm to 8 mm, in particular from 3 mm to 6 mm, for separating (19) non-plastic contaminants or contaminants which contain a predominant proportion of substances with a density of more than 1 g / cm 3 , especially more than 1.8 g / cm 3 and having a grain size in the range of 3 mm to 8 mm from the metal-free waste fraction (17), wherein by means of the separation device (18) a first heavy fraction (20) can be separated or removed and a good fraction (23) can be provided for the subsequent plant components, - wherein the good fraction (23) can be stored or buffered in the pre-silo (24) so ​​that a continuous supply of the good fraction (23) to the hydrocyclone (25) can be provided, - wherein, by means of the hydrocyclone (25) by fine separation (26), plastics with adhering or fixed non-plastic contaminants and plastics with a density of more than 1 g / cm 3 can be separated and removed from the good fraction (23) as a second heavy fraction (27) and the target sorting fraction (1) can be removed. II. Plant (2) according to claim 10, characterized in that the waste fraction (3) can be crushed by means of the crushing device (7) to a grain size of maximum 25 mm.

12. Plant (2) according to one of claims 10 or 11, further comprising a treatment device (28) for the continuous treatment of a liquid used in the hydrocyclone (25) by filtration, adaptation of the pH value of the liquid and heavy metal separation.

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