FI20206366A1 - Process system and method of processing recycled textile fibers - Google Patents

Process system and method of processing recycled textile fibers Download PDF

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Publication number
FI20206366A1
FI20206366A1 FI20206366A FI20206366A FI20206366A1 FI 20206366 A1 FI20206366 A1 FI 20206366A1 FI 20206366 A FI20206366 A FI 20206366A FI 20206366 A FI20206366 A FI 20206366A FI 20206366 A1 FI20206366 A1 FI 20206366A1
Authority
FI
Finland
Prior art keywords
recycled textile
fiber suspension
textile fiber
synthetic fibers
process system
Prior art date
Application number
FI20206366A
Other languages
Finnish (fi)
Swedish (sv)
Inventor
Johan Emilsson
Tuomo Aho
Mika Körkkö
Juha Pousi
Original Assignee
Valmet Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to FI20206366A priority Critical patent/FI20206366A1/en
Priority to PCT/FI2021/050808 priority patent/WO2022136724A1/en
Publication of FI20206366A1 publication Critical patent/FI20206366A1/en

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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G5/00—Separating, e.g. sorting, fibres
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
    • D01F13/02—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of cellulose, cellulose derivatives or proteins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G11/00—Disintegrating fibre-containing articles to obtain fibres for re-use
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • 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
    • B29B2017/001—Pretreating the materials before recovery
    • B29B2017/0015—Washing, rinsing
    • 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
    • B29B2017/0224—Screens, sieves
    • 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
    • B29B2017/0248—Froth flotation, i.e. wherein gas bubbles are attached to suspended particles in an aerated liquid
    • 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
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to a process system of processing recycled textile fibers comprising synthetic fibers and non-synthetic fibers in a recycled textile fiber suspension, in particular cotton fibers. The process system (10) comprises at least one flotation cell (14) for removing synthetic fibers from the recycled textile fiber suspension. The invention also relates to a method of processing recycled textile fibers, in which method recycled textile fiber suspension comprising synthetic fibers and non-synthetic fibers, in particular cotton fibers, is processed. In the method the recycled textile fiber suspension is treated in a flotation stage configured to be executed in at least one flotation cell (14) for removing the synthetic fibers from the recycled textile fiber suspension.

Description

Process system and method of processing recycled textile fibers Technical field In general, present invention relates to processing of recycled textile fibers, especially to processing recycled textile fibers. More especially the present invention relates to a process system of processing recycled textile fibers according to preamble part of the independent process system claim and to a method of processing recycled textile fibers according to preamble part of the independent method claim. Background As known from the prior art in processing of recycled textile fibers raw material to textile recycling process includes synthetic fibers in addition to cotton fibers. The content of the synthetic fibers in raw material typically vary from 0 % up to 50 %. Thus, the raw material mixture containing the synthetic fibers is not as valuable as a furnish for recyclable textile products having low and/or steady content of the synthetic fibers. Therefore, there exists a great challenge of how to remove the synthetic fibers from the textile pulp and to ensure that the content of the synthetic fibers in the end product is low. Typically, the synthetic fibers are removed by introducing chemical treatment stage or stages to textile recycling process due to the hydrophobic properties of the synthetic fibers. N This need of using of chemicals makes the removal of synthetic fibers from the N recycled textile fibers expensive as it needs investments to chemical handling = and application technologies and as it will consume the chemicals and further Q it needs the removal of synthetic fibers from soaking agent. Thus, there exists z 30 a great need to find a new manner of how to remove the synthetic fibers from c the textile pulp and to ensure that the content of the synthetic fibers in the end 3 product is low with decreased use of chemicals.
S N Flotation technology is known from prior art to be used in connection with various processes for separation of particles in relation to particle sizes or from separation of particles from other materials. In mining technology the flotation has been used for separation of small particles in relation to particle sizes. In connection with paper recycling the flotation has been used for separation of small particles, such as ink and/or dirt particles, from fibers. In connection with water handling the flotation has been used for separation of small particles from water by using dissolved air flotation in order to remove all solids from the water. In plastic separation the flotation has been used for separation of large particles in relation to particle sizes and in connection of wetting of plastics not intended to be separated.
An object of the invention is to create a process system and method of processing recycled textile fibers, in which the disadvantages and problems of prior art are eliminated or at least minimized.
An object of the invention is to create an improved process system and method of processing recycled textile fibers, in which new, alternative ways of processing recycled textile fibers are provided.
A particular, non-binding, object of the invention is to create a process system and method of processing recycled textile fibers, in which chemical treatment for separating synthetic fibers from the recycled textile fibers, especially from cotton fibers is eliminated or at least minimized.
Summary N In order to achieve the above mentioned objects, the process system of N processing recycled textile fibers according to the invention is mainly = characterized by the features of the characterizing clause of the independent Q process system claim and the method of processing recycled textile fibers z 30 according to the invention is in turn mainly characterized by the features of the c characterizing clause of the independent method claim. Advantageous 3 embodiments and features are disclosed in the dependent claims.
S N According to the invention the process system of processing recycled textile fibers comprising synthetic fibers and non-synthetic fibers in a recycled textile fiber suspension, in particular cotton fibers, comprises a flotation cell for removing synthetic fibers from the recycled textile fiber suspension. The non-synthetic fibers are natural fibers, for example cotton, wool etc. fibers. They can also be plant based fibers or for example man-made cellulose material based fibers. The synthetic fibers typically comprise polyester fibers. According to an advantageous feature of the invention the process system further comprises a refiner for refining a recycled textile fiber suspension in a refining stage and/or a screen for screening the recycled textile fiber suspension in a screening stage and/or a cleaning device for cleaning the recycled textile fiber suspension in a cleaning stage and/or a thickening device for increasing consistency of the recycled textile fiber suspension in a thickening stage.
According to an advantageous feature of the invention the flotation cell comprises at least one flotation stage. According to an advantageous feature of the invention the flotation cell comprises at least one recovery stage. According to an advantageous feature of the invention the at least one recovery stage is configured as a flotation stage. According to an advantageous feature of the invention the at least one N recovery stage is configured as a screen.
N = According to an advantageous feature of the invention in the process system Q the flotation cell is located after or before the screen for the screening stage z 30 and the cleaning device. a
O D According to an advantageous feature of the invention the flotation cell
O S comprises an injector with a feed channel, via which feed channel the recycled N textile fiber suspension is configured to be fed to the injector, a dam plate for forming an overflow, a reject space for receiving the overflow with the synthetic fibers, a reject channel for discharging the removed synthetic fibers out from the reject space. According to an advantageous feature of the invention the flotation cell further comprises at least one ultrasonic device configured to induce ultrasonic vibration and/or ultrasonic shock waves to the recycled textile fiber suspension for releasing onto the non-synthetic fibers attached synthetic fibers. According to an advantageous feature of the invention ultrasonic devices are located in one or more of the flotation cells. According to the invention in the method of processing recycled textile fiber suspension comprising synthetic fibers and non-synthetic fibers, in particular cotton fibers, is processed, wherein the recycled textile fiber suspension is treated in a flotation stage configured to be executed in at least one flotation cell for removing the synthetic fibers from the recycled textile fiber suspension. According to an advantageous feature of the invention in the method ultrasonic vibration and/or ultrasonic shock waves is induced to the recycled textile fiber suspension for releasing onto the non-synthetic fibers attached synthetic fibers. According to an advantageous feature of the invention in the method the recycled fiber suspension is fed to a process system comprising a refiner and/or a screen and/or a cleaning device and/or a thickening device and/or a N thickening device, in which method the recycled textile fiber suspension is N refined in the refiner in a refining stage and/or the recycled textile fiber = suspension is screened in the screen in a screening stage and/or the recycled Q textile fiber suspension is cleaned in the cleaning device in a cleaning stage z 30 and/or the recycled textile fiber suspension is treated in the thickening device c for increasing the consistency of the recycled textile fiber suspension in a 3 thickening stage.
S N According to an advantageous feature of the invention the recycled textile fiber suspension has advantageously a fiber feed consistency of non-synthetic fibers 0,05-1,5%.
According to an advantageous feature of the invention in the method into the recycled textile fiber suspension is fed flotation chemicals, for example soap for controlling foam formation, surfactants for reducing surface tension, 5 collectors for more selective separation, wetting agents for increasing stay of hydrophilic recycled textile in the recycled textile fiber suspension. According to an advantageous feature of the invention in the method the recycled textile fiber suspension is treated in the flotation cell for flotation time of 1-30 min, advantageously 2-10 min. According to an advantageous feature of the invention in the method final reject amount of removed synthetic fibers out from the flotation cell depends on the synthetic fibers amount in the feed of the recycled textile fiber suspension and the amount is 1 — 50% of the total feed mass. According to an advantageous aspect of the invention the separation efficiency of separating the synthetic fibers from the recycled textile fibers is increased by using low inlet consistency for separating the synthetic fibers are hydrophobic from the cotton fibers. When the synthetic fibers float towards the surface of the flotation cell, there exists a risk for the synthetic fibers of getting attached onto the cotton fibers are big, which could reduce the separating efficiency. Thus, according to a more advantageous aspect of the invention ultrasonic vibration is induced into the flotation suspension, advantageously in the lower part of the flotation cell, wherein the onto the cotton fibers attached N the synthetic fibers are separated by the ultrasonic vibration. In this more N advantageous embodiment especially need of chemical treatment for the = separation of the synthetic fibers from the recycled textile fibers, in particular Q from the cotton fibers is substantially decreased or even eliminated. z 30 Additionally, by this more advantageous embodiment one extra parameter is c provided for adjusting the flotation and for controlling the efficiency of the O flotation, and even decreased flotation time in flotation cells and decreased S space is needed.
N According to an advantageous aspect of the invention in the method separation of the recycled textile fiber the separation is adjusted by usage of flotation chemicals in connection with the flotation, thus no separate chemical treatment stage is needed, and/or controlling bubble size and/or amount and/or controlling retention time in flotation cells and/or varying configuration of flotation cells. Advantageously, the flotation of the recycled textile fibers is performed in a water-based system using flotation chemicals, for example fatty acids and/or silicone derivatives and/or non-ionic surfactants. According to an advantageous aspect of the invention the flotation cells for the flotation have an elliptical and linear design, which provides an excellent basis for smooth flow velocities and efficient removal of froth. According to an advantageous aspect of the invention the flotation cell is of the type disclosed in the patent publication EP 1891264 (B1) of the applicant and the flotation cell is provided with aerating injectors with special shaped jet nozzles of the type disclosed in the patent publication EP2129828 (B1) of the applicant. By the invention and its advantageous features several advantages are achieved: In the process system and the method of processing recycled textile fibers, the chemical treatment for separating synthetic fibers from the recycled textile fibers, especially from cotton fibers is eliminated or at least minimized and the synthetic fibers are removed selectively based on their hydrophobic properties. A furnish for recyclable textile products having low and/or steady content of the synthetic fibers is provided. The separation efficiency of separating synthetic fibers is even more than 95%.
S N Brief description of the drawings Q In the following the invention is explained in detail with reference to the E 30 accompanying drawing to which the invention is not to be narrowly limited. & In figure 1 is shown schematically an advantageous example of a process
O S system of processing recycled textile fibers according to the invention.
N
In figure 2 is shown schematically an advantageous example of the flotation cell of the flotation cell of the process system of processing recycled textile fibers according to the invention.
In figure 3 is shown schematically an advantageous example of the flotation cell of the process system of processing recycled textile fibers according to the invention.
Detailed description During the course of the following description like numbers and signs will be used to identify like elements according to the different views which illustrate the invention and its advantageous examples. In the figure some repetitive reference signs have been omitted for clarity reasons.
In figure 1 is shown schematically an example of a process system 10 of processing recycled textile fibers. The process system 10 comprises a refiner 11, for example a LC-refiner, a conical refiner or a disc refiner, into which the recycled textile fiber suspension is fed for refining in a refining stage. The process system 10 also comprises a screen 12, for example a pressure screen or a bow screen, for screening the recycled textile fiber suspension in a screening stage. The process system 10 further comprises a cleaning device 13, advantageously a low consistency cleaning device 13, for example a hydrocyclone, for cleaning the recycled textile fiber suspension, advantageously in low consistency. The process system 10 further comprises N a flotation cell 14 for removing and recovering the synthetic fibers from the N recycled textile fiber suspension. The process system 10 also comprises a = thickening device 15, for example a disc filter, for increasing the consistency Q of the recycled textile fiber suspension. The flotation cell 14 for removing the z 30 synthetic fibers is advantageously located after or before the screen 12 and c the cleaning device 13, as shown in the example of the figure 1. This location D provides for more secure operation of injectors of flotation cells of the flotation S cell 14, as the injectors thus remain cleaner and do not clog. It should be noted N that order of the refiner 11, the screen 12, the cleaning device 13, the flotation cell 14 and the thickening device 15 may have different configurations i.e., these parts of the process system 10 are not necessarily in the numeric order.
The flotation cell 14 comprises one or more flotation stages 52, in which flotation stage/-s the synthetic fibers, typically polymeric, are removed from the recycled textile fiber, and one or more recovery stages 53, for example flotation stages or screens, for recovering the synthetic fibers from the recycled textile fibers.
The recycled textile fiber suspension has advantageously a fiber feed consistency of 0,05-1,5%, even 20%. The recycled textile fiber suspension for feed to the flotation cell 14 may comprise chemicals, for example soap for controlling foam formation, surfactants for reducing surface tension, collectors for more selective separation, wetting agents for increasing stay of hydrophilic recycled textile in the recycled textile fiber suspension.
The flotation cell is advantageously of the type disclosed in the patent publication
EP1891264 (B1) of the applicant.
In figure 2 is shown an example of the flotation cell of the flotation cell of the process system of processing recycled textile fibers.
The flotation cell 14 comprises an injector 22 with a feed channel 23, via which feed channel 23 the recycled textile fiber suspension and possible flotation chemicals are fed to the injector 22. The flotation cell 14 comprises a dam plate 24, a reject 26 out from areject space 28 and a accept channel 27 for accept.
Surface of the suspension is denoted by reference sign 25. In the flotation cell 14 synthetic fibers are removed from the recycle textile fiber suspension.
The injector 22 is placed with respect to the surface 25 of the recycled textile fiber suspension in the flotation cell 14 such that the lower part of the injector 2f extends below the surface 5 of the fiber suspension.
In the flotation cell 14, the synthetic fibers of the recycled textile suspension adhere to bubbles formed by air and possible N flotation agent chemical, which rise to the surface 25 of the recycled textile N fiber suspension, wherefrom the synthetic fibers are removed for example by = overflow.
The overflow is formed by means of the dam plate 24 and the foam Q generated on the surface 25 of the recycled textile fiber suspension and the z 30 synthetic fibers therein are transferred over the dam plate 24 to the reject c space 28 and forwarded therefrom via the reject channel 26 to further D processing.
The accept of the flotation cell is removed via the accept channel S 27 to a next process phase.
The basic structure and mode of operation of the N flotation cell 14 is known as such to one skilled in the art, thus they will not be discussed in closer detail herein.
In the example of the figure 2 the flotation cell 14 has an elliptical and linear cell design, which provides an excellent basis for smooth flow velocities and efficient removal of foam. The injector 22 is advantageously an aerating injector with special shaped jet nozzles of the type disclosed in the patent publication EP2129828 (B1) of the applicant improving even more the efficient removal of the synthetic fibers.
In figure 3 is shown schematically an example of the flotation cell 14 of the process system 10 of processing recycled textile fibers. The flotation cell 14 comprises at least one flotation stage 52 and at least one recovery stage 53, which in this example is a flotation stage. The recycled textile fiber suspension is fed to the flotation cell 14 via a feed channel 56 and pumped by a pump 51 to the first flotation stage 52. The flotation cell 14 comprises pumps 51 for feeding the recycled textile fiber suspension forwards from one flotation/recovery stage 52, 53 to next flotation/recovery stage 52, 53 in feed direction. The flotation cell 14 comprises a tank 59 between the flotation stages 52 and the recovery stages 53 and respectively a feed channel 54 from flotation stages 52 to the tank 59 and a feed channel 55 from the tank 59 to the recovery stages 53. The separated synthetic fibers are removed by a reject channel 57, for example to be recirculated in the flotation cell 14 or to other removal. In one or more flotation cells 14 of the flotation stages 52, 53 ultrasonic vibration and/or ultrasonic shock waves by the ultrasonic device/-s 61 is induced to the flotation suspension in the flotation cell 14, whereby the onto the non-synthetic, in particular cotton, fibers attached the synthetic fibers are released from the non-synthetic fibers and separated by the ultrasonic vibration. The ultrasonic devices 61 are advantageously located in the lower part of the flotation cell 14. By controlling frequency of the ultrasonic vibration N and/or ultrasonic shock waves efficiency can be controlled. The flotation cell N 14 may also comprise a separate ultrasonic stage with at least one ultrasonic = device 61 for treatment of the recycled textile fiber suspension by the ultrasonic Q vibration and/or ultrasonic shock waves without flotation. This ultrasonic stage z 30 may be located at any location within the flotation cell 14. Each flotation cell c 14 comprises one or more injectors 22. The flotation time in each flotation cell D 14 is 1-30 min, advantageously 2-10 min. Recycled textile fiber suspension is S fed to the flotation cell 14 at the non-synthetic fiber consistency of 0.05—1.5%. N The final reject amount of removed synthetic fibers out from flotation cell 14 depends on the synthetic fibers amount in the feed of the recycled textile fiber suspension via the feed channel 56 and the amount can be 1 — 50% of the total feed mass. In the description in the foregoing, although some functions have been described with reference to certain features and examples, those functions may be performable by other features and examples whether described or not. Although features have been described with reference to the certain examples, those features may also be present in other examples whether described or not.
Above only some advantageous examples of the inventions have been described to which examples the invention is not to be narrowly limited and many modifications and alterations are possible within the invention.
O QA O N N - N
I a a
O
O 0
O O QA O N
Reference sings used in the drawing: 10 process system 11 refiner 12 screen 13 cleaning device 14 flotation cell 15 thickening device 22 injector 23 feed channel 24 dam plate 25 surface 26 accept channel 27 reject channel 28 reject space 51 pump 52 flotation stage 53 recovery stage 54 feed channel from flotation stages to tank 55 feed channel from tank to recovery stages 56 feed channel to flotation cell 57 reject channel 59 tank 61 ultrasonic device
O QA O N N - N
I =
O
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O O QA O N

Claims (17)

Claims
1. Process system of processing recycled textile fibers comprising synthetic fibers and non-synthetic fibers in a recycled textile fiber suspension, in particular cotton fibers, characterized in that the process system (10) comprises at least one flotation cell (14) for removing synthetic fibers from the recycled textile fiber suspension.
2. Process system according to claim 1, characterized in that the process system (10) further comprises a refiner (11) for refining the recycled textile fiber suspension in a refining stage and/or a screen (12) for screening the recycled textile fiber suspension in a screening stage and/or a cleaning device (13) for cleaning the recycled textile fiber suspension in a cleaning stage and/or a thickening device (15) for increasing consistency of the recycled textile fiber suspension in a thickening stage.
3. Process system according to claim 1 or 2, characterized in that the flotation cell (14) comprises at least one flotation stage (52).
4. Process system according to any of claims 1-3, characterized in that the flotation cell (14) comprises at least one recovery stage (53).
5. Process system according to claim 4, characterized in that the at least N one recovery stage (53) is configured as a flotation stage.
N =
6. Process system according to claim 4 or 5, characterized in that the at Q least one recovery stage (53) is configured as a screen. z 30 a ©
7. Process system according to any of claims 2-6, characterized in that D in the process system the flotation cell (14) is located after or before the
O S screen (12) for the screening stage and the cleaning device (13).
N
8. Process system according to any of previous claims, characterized in that the flotation cell (14) comprises an injector (22) with a feed channel
(23), via which feed channel (23) the recycled textile fiber suspension is configured to be fed to the injector (22), a dam plate (24) for forming an overflow, a reject space (28) for receiving the overflow with the synthetic fibers, a reject channel (26) for discharging the removed synthetic fibers out from the reject space (28).
9. Process system according to any of previous claims, characterized in that the flotation cell (14) further comprises at least one ultrasonic device (61) configured to induce ultrasonic vibration and/or ultrasonic shock waves to the recycled textile fiber suspension for releasing onto the non-synthetic fibers attached synthetic fibers.
10. Process system according to claim 9, characterized in that ultrasonic devices (61) are located in one or more of the flotation cells (14).
11. Method of processing recycled textile fibers, in which method recycled textile fiber suspension comprising synthetic fibers and non-synthetic fibers, in particular cotton fibers, is processed, characterized in that in the method the recycled textile fiber suspension is treated in a flotation stage configured to be executed in at least one flotation cell (14) for removing the synthetic fibers from the recycled textile fiber suspension.
12. Method according to claim 11, characterized in that in the method ultrasonic vibration and/or ultrasonic shock waves is induced to the recycled textile fiber suspension for releasing onto the non-synthetic N fibers attached synthetic fibers.
N = 13. Method according to claim 11 or 12, characterized in that in the Q method the recycled textile fiber suspension is fed to a process system z 30 (10) comprising a refiner (11) and/or a screen (12) and/or a cleaning c device (13) and/or a thickening device (14) and/or a thickening device D (15), in which method the recycled textile fiber suspension is refined in S the refiner (11) in a refining stage and/or the recycled textile fiber N suspension is screened in the screen (12) in a screening stage and/or the recycled textile fiber suspension is cleaned in the cleaning device (13) in a cleaning stage and/or the recycled textile fiber suspension is treated in the thickening device (15) for increasing the consistency of the recycled textile fiber suspension in a thickening stage.
14. Method according to any of claims 11 - 13, characterized in that the recycled textile fiber suspension has advantageously a fiber feed consistency of non-synthetic fibers 0,05-1,5%.
15. Method according to any of claims 11-14, characterized in that in the method into the recycled textile fiber suspension is fed flotation chemicals, for example soap for controlling foam formation, surfactants for reducing surface tension, collectors for more selective separation, wetting agents for increasing stay of hydrophilic recycled textile in the recycled textile fiber suspension.
16. Method according to any of claims 11-15, characterized in that in the method the recycled textile fiber suspension is treated in the flotation cell (14) for flotation time of 1-30 min, advantageously 2-10 min.
17. Method according to any of claims 11-16, characterized in that in the method final reject amount of removed synthetic fibers out from the flotation cell (14) depends on the synthetic fibers amount in the feed of the recycled textile fiber suspension and the amount is 1 — 50% of the total feed mass.
O
QA
O
N
N -
N
I a a
O
O 0
O
O
QA
O
N
FI20206366A 2020-12-23 2020-12-23 Process system and method of processing recycled textile fibers FI20206366A1 (en)

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GB2623761A (en) * 2022-10-24 2024-05-01 James Cropper Plc Method of separating polyester and cotton

Family Cites Families (8)

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GB1444831A (en) * 1973-12-08 1976-08-04 Mitsui Mining & Smelting Co Method for separation of a mixture of a polyester and a cellulose derivative
DE3002061C2 (en) * 1980-01-21 1982-02-11 Herbert 5942 Kirchhundem Grünewald Process for the separation of plastics and fibers from mixed waste
FI122973B (en) 2005-06-17 2012-09-28 Metso Paper Inc Injector for flotation cell, nozzle part in injector for flotation cell, flotation cell and method for mixing fiber suspension strip and air with each other in injector for flotation cell
FI119598B (en) 2007-04-05 2009-01-15 Metso Paper Inc Flotation cell injector
WO2009061556A1 (en) * 2007-11-05 2009-05-14 Paspek Stephen C Jr Process for density separation using immiscible liquids
US11364661B2 (en) * 2016-04-20 2022-06-21 Broadview Group International, Llc Processes and structures for recycling carpet and products of such processes
EP3511140A1 (en) * 2018-01-15 2019-07-17 Lenzing Aktiengesellschaft A process for separating a fibrous target component from textile waste
EP3747614A1 (en) * 2019-06-04 2020-12-09 Lenzing Aktiengesellschaft Method for providing a prepared cellulose-comprising material with predetermined fibre length distribution

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