CN110802767A - Method for sorting mixed plastics - Google Patents

Method for sorting mixed plastics Download PDF

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Publication number
CN110802767A
CN110802767A CN201911095236.7A CN201911095236A CN110802767A CN 110802767 A CN110802767 A CN 110802767A CN 201911095236 A CN201911095236 A CN 201911095236A CN 110802767 A CN110802767 A CN 110802767A
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Prior art keywords
liquid medium
flotation
mixed
separation
floating
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CN201911095236.7A
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Chinese (zh)
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CN110802767B (en
Inventor
熊道陵
邱萍
王露琦
宗毅
曹雪文
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Jiangxi University of Science and Technology
Buddhist Tzu Chi General Hospital
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Buddhist Tzu Chi General Hospital
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    • 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
    • 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
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/44—Application of particular media therefor
    • B03B5/442—Application of particular media therefor composition of heavy media
    • 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
    • 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
    • B29B2017/0234—Mechanical separating techniques; devices therefor using gravity, e.g. separating by weight differences in a wind sifter
    • 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
    • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
    • B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
    • 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

Abstract

The invention discloses a method for sorting mixed plastics, which comprises the following steps: firstly, crushing mixed plastic containing light components and heavy components to obtain mixed plastic particles; then adding the mixed plastic particles into a first liquid medium for floating-sinking separation to respectively obtain a floating light component and a sinking heavy component; and finally, adding the heavy component into a second liquid medium and a flotation agent for flotation. According to the invention, the floating-sinking separation and the flotation method are matched, mixed plastics with different densities are separated firstly, then the remaining plastics with similar densities are separated through flotation, and meanwhile, the two separation methods are both wet separation, so that no additional step is required to be added in the middle, the method is simple, and the labor and the time are saved.

Description

Method for sorting mixed plastics
Technical Field
The invention belongs to the field of plastic sorting, and particularly relates to a sorting method of mixed plastics.
Background
The plastic has excellent chemical and physical properties, and has the characteristics of low density and easy processing, and is widely applied to various fields of production and life. But as the use amount of the waste plastics is increased, the amount of the waste plastics is increased. The traditional treatment method of the waste plastics is landfill and incineration, however, the landfill causes serious white pollution because the waste plastics are difficult to degrade in the natural environment, and the incineration generates a large amount of toxic and harmful gas to be discharged into the air. Improper treatment of waste plastics can cause extremely strong damage to ecology and waste a large amount of resources, and how to recycle the waste plastics and recycle the resources becomes an important task nowadays.
At present, people develop a great deal of intensive research in the field of waste plastic separation, and a plurality of research results exist at present, and for plastics with different densities, a floating and sinking separation method can be used for separation, but some plastics have similar densities and are difficult to separate.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the components in the existing mixed plastic are difficult to separate, and further provides a mixed plastic separation method which is simple to operate and good in separation effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides a method for sorting mixed plastics, which comprises the following steps:
s1: crushing the mixed plastic containing the light component and the heavy component to obtain mixed plastic particles;
s2: adding the mixed plastic particles into a first liquid medium for floating-sinking separation to respectively obtain a floating light component and a sinking heavy component; the first liquid medium is a solution comprising sulfate;
s3: adding the heavy component into a second liquid medium, and then adding a flotation agent for flotation; the second liquid medium is a solution comprising sulfate.
The light component is one of Polystyrene (PS), polypropylene (PP), Polyethylene (PE) and acrylonitrile/butadiene/styrene copolymer (ABS);
the regroups are mixtures of polyvinyl chloride (PVC) and polyethylene terephthalate (PET).
Preferably, the solvent of the first liquid medium in step S2 is water, and the solute is at least one of ammonium sulfate, sodium sulfate, ammonium bisulfate, and magnesium sulfate;
the density of the first liquid medium is between 1.120Kg/L and 1.125Kg/L, and is greater than the density of the light component.
In the step S2, the floating and sinking separation is carried out for 5-10 min at a stirring speed of 30-60 r/min.
In step S3, the solvent of the second liquid medium is water, and the solute is at least one of ammonium sulfate, sodium sulfate, ammonium bisulfate, and magnesium sulfate; and/or
The density of the second liquid medium is between 1.40Kg/L and 1.45 Kg/L.
In step S3, the flotation agent is a mixture of polyacrylamide and at least one of calcium lignosulfonate and tannic acid.
The total adding amount of the calcium lignosulphonate and the tannic acid is 0.05g/L-0.5g/L, and the total adding amount of the polyacrylamide is 0.05g/L-0.5 g/L.
In the step S3, the flotation is performed at a stirring speed of 30-60 r/min and an aeration speed of 150-200 mL/min, and the flotation time is 5-10 min.
The crushing in the step S1 is to crush the mixed plastic into mixed plastic particles with the diameter of 1-3mm by using a crusher.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the floating-sinking separation and the flotation method are matched, mixed plastics with different densities are separated firstly, then the remaining plastics with similar densities are separated through flotation, and meanwhile, the two separation methods are both wet separation, so that no additional step is required to be added in the middle, the method is simple, and the labor and the time are saved.
(2) The liquid medium of the invention uses sulfate as solvent, the traditional sodium chloride as solvent is easy to deliquesce and adsorb on the surface of the plastic to influence the separation effect, and is not easy to clean, which brings trouble to the later cleaning work, and the solubility of the sodium chloride is lower than that of the selected sulfate, the sulfate can be used to solve the problem of adhesion on the surface of the plastic, and the separation effect can be provided in an auxiliary way.
(3) The invention uses polyacrylamide to pre-treat the untreated plastic particles before flotation, the amide group in the polyacrylamide molecule has high activity, and the unique-CONH can thicken the liquid medium2The group can achieve the effect of directional sedimentation with an ester group in PET through the acting force of an O-H hydrogen bond, and the structure of PVC can not interact with polyacrylamide, so that the floating rate of PVC can not be obviously influenced, and the separation of the group and the ester group is realized.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
The mixed plastics used in examples 1-5 and comparative examples 1-2 consisted of PS, PET and PVC, all commercially available as recycled granules.
The first liquid medium used in examples 1-5 and comparative example 1 was a sulfate solution having a density of 1.12Kg/L and the second liquid medium was a sulfate solution having a density of 1.45 Kg/L.
Example 1
The embodiment provides a method for sorting mixed plastics, which comprises the following steps:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of ammonium sulfate solution with the density of 1.12Kg/L, stirring for 5 minutes at the stirring speed of 30r/min for carrying out sink-float separation, and separating to obtain heavy components consisting of floating PS plastic and sinking PET and PVC;
s3: and (3) sending the heavy components into a second flotation tank filled with 300mL of ammonium sulfate solution with the density of 1.45Kg/L, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.05g/L and the concentration of polyacrylamide is 0.08g/L, then carrying out flotation at the stirring rate of 30r/min and the aeration rate of 150mL/min for 5min, and separating to obtain the floating PVC and the sinking PET.
Example 2
The embodiment provides a method for sorting mixed plastics, which comprises the following steps:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of ammonium sulfate solution with the density of 1.12Kg/L, stirring for 10 minutes at the stirring speed of 40r/min for carrying out sink-float separation, and separating to obtain heavy components consisting of floating PS plastic and sinking PET and PVC;
s3: and (3) sending the heavy components into a second flotation tank filled with 300mL of ammonium sulfate solution with the density of 1.45Kg/L, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.1g/L and the concentration of polyacrylamide is 0.1g/L, then carrying out flotation at the stirring rate of 40r/min and the aeration rate of 160mL/min for 7min, and separating to obtain the floating PVC and the sinking PET.
Example 3
The embodiment provides a method for sorting mixed plastics, which comprises the following steps:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of ammonium bisulfate solution with the density of 1.12Kg/L, stirring for 6 minutes at the stirring speed of 50r/min for carrying out sink-float separation, and separating to obtain heavy components consisting of the floated PS plastic and the sunk PET and PVC;
s3: and (3) conveying the heavy components into a second flotation tank filled with 300mL of ammonium bisulfate solution with the density of 1.45Kg/L, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.15g/L and the concentration of polyacrylamide is 0.05g/L, then carrying out flotation at the stirring rate of 50r/min and the aeration rate of 170mL/min for 8min, and separating to obtain the floating PVC and the sinking PET.
Example 4
The embodiment provides a method for sorting mixed plastics, which comprises the following steps:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of a sodium sulfate solution with the density of 1.12Kg/L, carrying out sink-float separation at the stirring speed of 50r/min and the aeration speed of 180mL/min, and separating to obtain a heavy component consisting of the floated PS plastic and the sunk PET and PVC;
s3: and (3) sending the heavy components into a second flotation tank filled with 300mL of ammonium sulfate solution with the density of 1.45Kg/L, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.2g/L and the concentration of polyacrylamide is 0.2g/L, then carrying out flotation at the stirring rate of 60r/min and the aeration rate of 180mL/min for 10min, and separating to obtain the floating PVC and the sinking PET.
Example 5
The embodiment provides a method for sorting mixed plastics, which comprises the following steps:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of magnesium sulfate solution with the density of 1.120Kg/L, stirring for 9 minutes at the stirring speed of 60r/min for carrying out sink-float separation, and separating to obtain heavy components consisting of floating PS plastic and sinking PET and PVC;
s3: and (3) sending the heavy components into a second flotation tank filled with 300mL of ammonium sulfate solution with the density of 1.45Kg/L, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.5g/L and the concentration of polyacrylamide is 0.5g/L, then carrying out flotation at the stirring rate of 60r/min and the aeration rate of 200mL/min for 5min, and separating to obtain the floating PVC and the sinking PET.
Comparative example 1
The only difference between this comparative example and example 1 is that S3 has no polyacrylamide added.
The comparative example provides a method for sorting mixed plastics, comprising the steps of:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of ammonium sulfate solution with the density of 1.120Kg/L, stirring for 5 minutes at the stirring speed of 30r/min for carrying out sink-float separation, and separating to obtain heavy components consisting of floating PS plastic and sinking PET and PVC;
s3: and (3) sending the heavy components into a second flotation tank filled with 300mL of ammonium sulfate solution with the density of 1.45Kg/L, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.05g/L, then carrying out flotation at the stirring rate of 30r/min and the aeration rate of 150mL/min for 5min, and separating to obtain the floating PVC and the sinking PET.
Comparative example 2
The only difference between this comparative example and example 1 is that this comparative example uses sodium chloride as a solvent for the liquid medium, and a saturated sodium chloride solution having a density of 1.36Kg/L is used in step S3 due to the solubility of sodium chloride.
The comparative example provides a method for sorting mixed plastics, comprising the steps of:
s1: crushing 5g of mixed plastic containing PS, PET and PVC into 1-3mm mixed plastic particles by using a crusher;
s2: sending the mixed plastic particles into a first flotation tank filled with 450mL of 1.120Kg/L sodium chloride solution, stirring for 5 minutes at a stirring speed of 30/min for carrying out sink-float separation, and separating to obtain a heavy component consisting of the floating PS plastic and the sinking PET and PVC;
s3: and (3) sending the heavy component into a second flotation tank filled with 300mL of 1.33Kg/L sodium chloride solution, adding a flotation agent to ensure that the concentration of calcium lignosulfonate in the solution is 0.05g/L and the concentration of polyacrylamide is 0.08g/L, then carrying out flotation at the stirring rate of 30r/min and the aeration rate of 150mL/min for 5min, and separating to obtain the floating PVC and the sinking PET.
Test examples
The recycling effects of PS, PET and PVC in examples 1-5 and comparative examples 1-2 were counted, and the results are shown in the following table:
TABLE 1 PET and PVC separation and recycle effectiveness in examples 1-5 and comparative example 1
PS yield% PS purity% The yield of PET is% Purity of PET% PVC yield% Purity of PVC%
Example 1 99.6 99.5 97.7 98.1 97.1 98.0
Example 2 99.6 99.6 98.5 99.2 97.2 99.1
Example 3 99.8 99.6 98.7 99.3 98.3 99.3
Example 4 99.6 99.7 98.5 99.1 98.1 99.1
Example 5 99.7 99.6 98.1 99.2 98.2 99.0
Comparative example 1 99.7 99.5 80.0 88.9 90.0 81.8
Comparative example 2 98.6 99.5 98.0 96.1 96.0 98.0
As can be seen from the above table, the recovery effect of PET and PVC in comparative example 1 is obviously inferior to that of example 1, which shows that polyacrylamide has obvious effect in the separation of PET and PVC; the separation effect of comparative example 2 is slightly inferior to that of example 1 because the precipitation of sodium chloride adheres to the plastic, and it is demonstrated that the mixed plastic can be separated more effectively by using sulfate as the solute.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (9)

1. The method for sorting the mixed plastics is characterized by comprising the following steps of:
s1: crushing the mixed plastic containing the light component and the heavy component to obtain mixed plastic particles;
s2: adding the mixed plastic particles into a first liquid medium for floating-sinking separation to respectively obtain a floating light component and a sinking heavy component; the first liquid medium is a solution comprising sulfate;
s3: adding the heavy component into a second liquid medium, and then adding a flotation agent for flotation; the second liquid medium is a solution comprising sulfate.
2. The sorting method of claim 1, wherein the light fraction is one of polystyrene, polypropylene, polyethylene, and acrylonitrile/butadiene/styrene copolymer;
the component is a mixture of polyvinyl chloride and polyethylene terephthalate.
3. The sorting method according to claim 1 or 2, wherein the solvent of the first liquid medium in step S2 is water, and the solute is at least one of ammonium sulfate, sodium sulfate, ammonium bisulfate, and magnesium sulfate;
the density of the first liquid medium is between 1.120Kg/L and 1.125Kg/L, and is greater than the density of the light component.
4. The sorting method according to any one of claims 1 to 3, wherein the sink-float separation in step S2 is a stirring separation at a stirring speed of 30 to 60r/min for 5 to 10 min.
5. The sorting method according to any one of claims 1 to 4, wherein the solvent of the second liquid medium in step S3 is water, and the solute is at least one of ammonium sulfate, sodium sulfate, ammonium bisulfate, and magnesium sulfate; and/or
The density of the second liquid medium is between 1.40Kg/L and 1.45 Kg/L.
6. The sorting method according to any one of claims 1 to 4, wherein in step S3, the flotation agent is a mixture of polyacrylamide and at least one of calcium lignosulfonate and tannic acid.
7. The sorting method according to claim 6, wherein the total addition amount of the calcium lignosulfonate and the tannic acid is 0.05g/L to 0.5g/L, and the addition amount of the polyacrylamide is 0.05g/L to 0.5 g/L.
8. The sorting method according to any one of claims 1 to 7, wherein the flotation in step S3 is performed at a stirring rate of 30 to 60r/min and an aeration rate of 150 to 200mL/min for 5 to 10 min.
9. The sorting method according to any one of claims 1 to 8, wherein the crushing in step S1 is to crush the mixed plastics into mixed plastics particles of 1 to 3mm using a crusher.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN111590785A (en) * 2020-06-02 2020-08-28 南京浦世环境科技发展有限公司 Method for preparing wood-plastic composite material by using waste mask
CN112461707A (en) * 2020-11-28 2021-03-09 江苏盐城津能电力有限公司 Inspection formula solution for plastic cable protection pipe
CN113618966A (en) * 2021-08-30 2021-11-09 陕西师范大学 Method for separating micro plastic and biochar

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US4617111A (en) * 1985-07-26 1986-10-14 Plastic Recycling Foundation, Inc. Method for the separation of a mixture of polyvinyl chloride and polyethylene terephtalate
CN104511369A (en) * 2015-01-20 2015-04-15 中南大学 Method for waste mixed plastic separation
CN105348556A (en) * 2015-11-11 2016-02-24 广东金发科技有限公司 Suspension used for flotation separation of waste plastic, preparing method thereof and applications of the suspension

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4617111A (en) * 1985-07-26 1986-10-14 Plastic Recycling Foundation, Inc. Method for the separation of a mixture of polyvinyl chloride and polyethylene terephtalate
CN104511369A (en) * 2015-01-20 2015-04-15 中南大学 Method for waste mixed plastic separation
CN105348556A (en) * 2015-11-11 2016-02-24 广东金发科技有限公司 Suspension used for flotation separation of waste plastic, preparing method thereof and applications of the suspension

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111590785A (en) * 2020-06-02 2020-08-28 南京浦世环境科技发展有限公司 Method for preparing wood-plastic composite material by using waste mask
CN112461707A (en) * 2020-11-28 2021-03-09 江苏盐城津能电力有限公司 Inspection formula solution for plastic cable protection pipe
CN112461707B (en) * 2020-11-28 2023-01-17 江苏盐城津能电力有限公司 Inspection formula solution for plastic cable protection pipe
CN113618966A (en) * 2021-08-30 2021-11-09 陕西师范大学 Method for separating micro plastic and biochar

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