CN105399983A - A separating method of mixed plastics - Google Patents
A separating method of mixed plastics Download PDFInfo
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- CN105399983A CN105399983A CN201510906167.9A CN201510906167A CN105399983A CN 105399983 A CN105399983 A CN 105399983A CN 201510906167 A CN201510906167 A CN 201510906167A CN 105399983 A CN105399983 A CN 105399983A
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- mixed plastic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
- C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- 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 relates to a separating method of mixed plastics and belongs to the technical field of waste plastic recovery. The method includes subjecting mixed plastic particles to surface modification by dipping the mixed plastic particles into an aqueous solution containing a wetting agent until an adsorption amount of the wetting agent on surfaces of the mixed plastic particles is not less than 5 g/t, performing solid liquid separation, adding the obtained solid into an eluant, eluting for not more than 20 min, performing solid liquid separation to obtain solid that is eluted mixed plastic particles, and subjecting the eluted mixed plastic particles to floatation to obtain a single plastic with high purity. The method is high in separation efficiency, simple in operation, easily controllable and low in cost and facilitates large-scale industrial application.
Description
Technical field
The present invention relates to a kind of separation method of waste and old mixed plastic, belong to technics of reclaim of plastic waste technical field.
Background technology
Plastics are in the life of the mankind and have a wide range of applications in producing, and a large amount of consumption of the developing rapidly of plastics industry, plastics and the shorter life cycle of plastic prod make the quantity of plastic refuse sharply increase.The processing mode of waste or used plastics, for burning and landfill, creates serious environmental pollution and the waste of resource.Therefore, the recycling of waste or used plastics is paid much attention to.To technics of reclaim of plastic waste process, need to be separated different plastics, the separation of current plastics is bottlenecks of restriction technics of reclaim of plastic waste process.
The mixed plastic isolation technique of exploitation comprises the methods such as hand-sorted, gravity separation, flotation, electrostatic separation and selective dissolution.The hand-sorted process labour intensity of plastics is large, work under bad environment, separation efficiency are low.Gravity separation and electrostatic separation have been separated very large limitation to the close mixed plastic of physical properties.Selective solvent cost is high, and organic solvent has very large toxicity.At present, flotation can realize having good advantage to the mixed plastic of similar density, but plastics have close hydrophobic property mostly, can be realized the selective separation of mixed plastic by the adjustment of wetting agent.The research that current employing flotation is separated waste or used plastics is relatively less, and all adopts wetting agent directly to adjust plastics and carry out flotation, and the Adsorption of general wetting agent to different plastics is less, and therefore separating effect is not ideal enough.The present invention proposes wetting agent selectivity desorption first to mixed plastic flotation separation, wetting agent is first adopted to carry out surface regulation and control to plastics, then by the further desorption of wetting agent molecule stirred or ultrasonic cleaning makes frosting adsorb, after desorption, different plastics increase at the significant difference of floatation process flotability, and flotation results is more stable, and then the efficient flotation separation realizing mixed plastic is separated.
Summary of the invention
For the defect of the method existence that plastics close to physicochemical property in prior art are separated, the object of the invention is to be to provide a kind of method to mixed plastic high efficiency separation, the method is simple to operate, cost is low, meets industrial applications and produces.
The separation method of a kind of mixed plastic of the present invention, comprises the steps:
Step one
After the aqueous solution be immersed in by mixed plastic particles containing wetting agent carries out surface modification, solid-liquid separation, gained solid is the mixed plastic particles after surface modification; Described wetting agent is selected from least one in sulfonated lignin, Weibull, gelatin, quebracho juice, sapn, montanin wax, lauryl alcohol, water glass, cellulose acetate, at least one, the more preferably sulfonated lignin be preferably in sulfonated lignin, Weibull, water glass; The adsorptive capacity of the mixed plastic particles surface active agent after surface modification is more than or equal to 5g/t, is preferably 5 ~ 100g/t, more preferably 5 ~ 20g/t;
Step 2
Be placed in by mixed plastic particles after step one gained surface modification after water wash-out is no more than 20 minutes, solid-liquid separation, gained solid is mixed plastic particles after wash-out;
Step 3
Flotation is carried out to mixed plastic particles after step 2 gained wash-out; Realize the separation of mixed plastic.
The separation method of a kind of mixed plastic of the present invention, described mixed plastic comprises two or more different plastics of chemical formula.
The separation method of a kind of mixed plastic of the present invention, mixed plastic is polyvinyl chloride and polyethylene terephthalate plastics; Or be acrylonitrile-butadiene-styrene (ABS) and polystyrene plastic.
The separation method of a kind of mixed plastic of the present invention, the particle diameter of mixed plastic particles is less than 2cm, and the particle diameter of 90% particle is less than 1cm.Further preferred version is: particle diameter be the mixed plastic particles of 0.1 ~ 1cm account for more than 70% and 70% of whole mixed plastic particles number.
The separation method of a kind of mixed plastic of the present invention, in step one, containing in the aqueous solution of wetting agent, the concentration of wetting agent is 1 ~ 10g/L, is preferably 4 ~ 8g/L, more preferably 5 ~ 6g/L.
The separation method of a kind of mixed plastic of the present invention, in step one, the pH value of the aqueous solution containing wetting agent is 4.5 ~ 7.5.The aqueous solution containing wetting agent water used can be at least one in tap water, deionized water, seawater, distilled water.
The separation method of a kind of mixed plastic of the present invention, in step one, described sulfonated lignin comprise lignosulfonic acid sodium salt, sulfomethylated lignin acid potassium salt, lignosulfonic acid calcium salt, lignosulfonic acid magnesium salts, lignosulfonic acid manganese salt, lignosulfonic acid ammonium salt.
The separation method of a kind of mixed plastic of the present invention, in step, containing the inorganic salt also containing 1 ~ 100mg/L in the aqueous solution of wetting agent, described inorganic salt comprise sodium-chlor, aluminum chloride, calcium chloride, Repone K, sodium carbonate, salt of wormwood, magnesium chloride, iron(ic) chloride, magnesium sulfate.
The separation method of a kind of mixed plastic of the present invention, in step, when the aqueous solution be immersed in by mixed plastic particles containing wetting agent carries out surface modification, mechanical stirring is adopted to promote the absorption of wetting agent, stir speed (S.S.) is 50 ~ 200 revs/min, time is 10 ~ 120 minutes, is preferably 20 ~ 40 minutes, makes the adsorptive capacity of mixed plastic surface active agent be not less than 5g/t.
The separation method of a kind of mixed plastic of the present invention, in step 2, the mixed plastic particles after step one gained surface modification is placed in water, and under agitation condition and/or ultrasound condition, wash-out is after 2 ~ 20 minutes, solid-liquid separation, gained solid is mixed plastic particles after wash-out; The speed of described stirring is 200 ~ 800 revs/min, is preferably 300 ~ 500 revs/min, more preferably 400 revs/min, and described ultrasonic power is 20 ~ 100kW, is preferably 40 ~ 60kW, more preferably 50kW.During wash-out, water used is at least one in tap water, deionized water, distilled water.
The separation method of a kind of mixed plastic of the present invention, in step 3, in mass ratio, flotation fluid: mixed plastic particles=9-99:1 after wash-out, adds in flotation fluid by mixed plastic particles after step 2 gained wash-out, carries out flotation; Described flotation fluid is made up of water and minerals, and the pH value of flotation fluid is 4 ~ 8; In flotation fluid, the concentration of inorganic salt is 100 ~ 2000mg/L; Described inorganic salt are selected from least one in sodium-chlor, aluminum chloride, calcium chloride, Repone K, sodium carbonate, salt of wormwood, magnesium chloride, iron(ic) chloride, magnesium sulfate.
The separation method of a kind of mixed plastic of the present invention, in step 3, during flotation, add pore forming material, described pore forming material is selected from least one in pine camphor oil, methyl isobutyl carbinol, isooctyl alcohol, and described frother dosages is 1 ~ 100g/t plastics, is preferably 1 ~ 50g/t plastics.
The separation method of a kind of mixed plastic of the present invention, flotation 1 ~ 10 minute.Being separated of at least one plastics and other plastics can be realized.And the unitary plastic purity separated is high.
The separation method of a kind of mixed plastic of the present invention, energy sharp separation Typical physical chemical process is difficult to the mixed plastic of separation or high efficiency separation.
Principle and advantage
The present invention proposes wetting agent selectivity desorption first to mixed plastic flotation separation, wetting agent is first adopted to carry out surface modification to plastics, then appropriate desorption is carried out by the wetting agent molecule stirred or ultrasonic cleaning makes frosting adsorb, after appropriate desorption, different plastics increase at the significant difference of floatation process flotability, and flotation results is more stable, and then the efficient flotation separation realizing mixed plastic is separated.
The present invention is based on mixed plastic close to physical properties in prior art to be difficult to realize being separated, the present invention adopts wetting agent selectivity desorption method to carry out flotation separation to mixed plastic first, achieves the high efficiency separation of mixed plastic.Method energy of the present invention efficiently recycled plastic from mixed plastic, the rate of recovery is higher than 98%, and purity reaches 99.6%; In addition, technological operation of the present invention is simple, cost is low, has good economic feasibility, meets industrial applications.
Embodiment
Explain the present invention further by following examples, embodiment is construed as forcing restriction to scope of the present invention never in any form.On the contrary, understanding should be known, other embodiments various that those skilled in the art can be taked can to find out after reading description herein, amendment and equivalent thereof and do not depart from the scope of spirit of the present invention and/or claims.
Embodiment 1
PVC and PET mixed plastic is carried out fragmentation, get the plastic grain 150g of 0.5 ~ 1.0cm particle diameter, join in the lignosulfonic acid sodium water solution of 10g/L, 90mg/L magnesium sulfate is added in the aqueous solution, and to adjust pH be 7.5, mechanical stirring speed is 100 revs/min, and churning time is 90 minutes, then mixed plastic is put into tap water, ultrasonic cleaning, power is 20kW, and the time is 5 minutes, then carries out flotation, flotation conditions is: the methyl isobutyl carbinol of 30g/t, flotation 4min, pH are 7.8, add 2000mg/L sodium carbonate in flotation medium.After being separated, the purity of PVC and PET is respectively 99.6% and 98.3%, and the rate of recovery is greater than 98%.
Comparative example 1
PVC and PET mixed plastic is carried out fragmentation, get the plastic grain 150g of 0.5 ~ 1.0cm particle diameter, join in the lignosulfonic acid sodium water solution of 10g/L, in the aqueous solution, add 90mg/L magnesium sulfate, and to adjust pH be 7.5, mechanical stirring speed is 100 revs/min, and churning time is 90 minutes, then carries out flotation, flotation conditions is: the methyl isobutyl carbinol of 30g/t, flotation 4min, pH are 7.8, add 2000mg/L sodium carbonate in flotation medium.After being separated, the purity of PVC and PET is respectively 80.3% and 78.6%, and the rate of recovery is 70%.
Obviously can find out that wash-out process significantly can increase separating effect by comparative example.
Embodiment 2
ABS and PS mixed plastic is carried out fragmentation, get the plastic grain 100g of 0.1 ~ 1.0cm particle diameter, join in the calcium lignin sulphonate aqueous solution of 1g/L, 20mg/L magnesium chloride is added in the aqueous solution, and to adjust pH be 4.8, mechanical stirring speed is 50 revs/min, and churning time is 20 minutes, then mixed plastic is put into tap water, ultrasonic cleaning, power is 80kW, and the time is 2 minutes, then carries out flotation, flotation conditions is: the isooctyl alcohol of 80g/t, flotation 6min, pH are 5, add 1000mg/L magnesium chloride in flotation medium.After being separated, the purity of PVC and PET is respectively 94.3% and 95.3%, and the rate of recovery is greater than 96.2%.
Comparative example 2
ABS and PS mixed plastic is carried out fragmentation, get the plastic grain 100g of 0.1 ~ 1.0cm particle diameter, join in the calcium lignin sulphonate aqueous solution of 1g/L, 20mg/L magnesium chloride is added in the aqueous solution, and to adjust pH be 4.8, mechanical stirring speed is 50 revs/min, and churning time is 20 minutes, then mixed plastic is put into tap water, ultrasonic cleaning, power is 120kW, and the time is 40 minutes, then carries out flotation, flotation conditions is: the isooctyl alcohol of 80g/t, flotation 6min, pH are 5, add 1000mg/L magnesium chloride in flotation medium.After being separated, the purity of PVC and PET is respectively 81.2% and 84.5%, and the rate of recovery is 84.6%.
Embodiment 3
PVC and PET mixed plastic is carried out fragmentation, get the plastic grain 100g of 0.5 ~ 2.0cm particle diameter, join in the lignosulfonic acid aqueous ammonium of 8g/L, 10mg/L sodium-chlor is added in the aqueous solution, and to adjust pH be 6.8, mechanical stirring speed is 180 revs/min, churning time is 110 minutes, then mixed plastic is put into distilled water, and mechanical stirring speed is 800 revs/min, churning time is 20 minutes, then carry out flotation, flotation conditions is: the pine camphor oil of 40g/t, flotation 8min, pH is 5, adds 200mg/L calcium chloride in flotation medium.After being separated, the purity of PVC and PET is respectively 92.6% and 94.3%, and the rate of recovery is greater than 95.8%.
Comparative example 3
PVC and PET mixed plastic is carried out fragmentation, get the plastic grain 100g of 0.5 ~ 2.0cm particle diameter, join in the lignosulfonic acid aqueous ammonium of 8g/L, 10mg/L sodium-chlor is added in the aqueous solution, and to adjust pH be 6.8, mechanical stirring speed is 180 revs/min, churning time is 110 minutes, then mixed plastic is put into distilled water, and mechanical stirring speed is 100 revs/min, churning time is 1 minute, then carry out flotation, flotation conditions is: the pine camphor oil of 40g/t, flotation 8min, pH is 5, adds 200mg/L calcium chloride in flotation medium.After being separated, the purity of PVC and PET is respectively 76.6% and 80.3%, and the rate of recovery is 81.4%.
Embodiment 4
ABS and PS mixed plastic is carried out fragmentation, get the plastic grain 80g of 0.1 ~ 1.5cm particle diameter, join in the magnesium lignosulfonate aqueous solution of 4g/L, 50mg/L calcium chloride is added in the aqueous solution, and to adjust pH be 5.5, mechanical stirring speed is 100 revs/min, churning time is 50 minutes, then mixed plastic is put into deionized water, and mechanical stirring speed is 200 revs/min, churning time is 5 minutes, then carry out flotation, flotation conditions is: the pine camphor oil of 10g/t, flotation 3min, pH is 7, adds 1200mg/L Repone K in flotation medium.After being separated, the purity of PVC and PET is respectively 96.3% and 96.3%, and the rate of recovery is greater than 98.7%.
Claims (10)
1. a separation method for mixed plastic, is characterized in that comprising the steps:
Step one
After the aqueous solution be immersed in by mixed plastic particles containing wetting agent carries out surface modification, solid-liquid separation, gained solid is the mixed plastic particles after surface modification; Described wetting agent is selected from least one in sulfonated lignin, Weibull, gelatin, quebracho juice, sapn, montanin wax, lauryl alcohol, water glass, cellulose acetate; The adsorptive capacity of the mixed plastic particles surface active agent after surface modification is more than or equal to 5g/t;
Step 2
Be placed in by mixed plastic particles after step one gained surface modification after water wash-out is no more than 20 minutes, solid-liquid separation, gained solid is mixed plastic particles after wash-out;
Step 3
Flotation is carried out to mixed plastic particles after step 2 gained wash-out; Realize the separation of mixed plastic.
2. the separation method of a kind of mixed plastic according to claim 1, is characterized in that: described mixed plastic comprises two or more different plastics of chemical formula.
3. the separation method of a kind of mixed plastic according to claim 2, is characterized in that: mixed plastic is polyvinyl chloride and polyethylene terephthalate plastics; Or be acrylonitrile-butadiene-styrene (ABS) and polystyrene plastic.
4. the separation method of a kind of mixed plastic according to claim 1, it is characterized in that: the particle diameter of mixed plastic particles is less than 2cm, and the particle diameter of 90% particle is less than 1cm.
5. the separation method of a kind of mixed plastic according to claim 1, is characterized in that: in step one, and containing in the aqueous solution of wetting agent, the concentration of wetting agent is 1 ~ 10g/L.
6. the separation method of a kind of mixed plastic according to claim 1, it is characterized in that: in step one, containing the inorganic salt also containing 1 ~ 100mg/L in the aqueous solution of wetting agent, described inorganic salt comprise sodium-chlor, aluminum chloride, calcium chloride, Repone K, sodium carbonate, salt of wormwood, magnesium chloride, iron(ic) chloride, magnesium sulfate.
7. the separation method of a kind of mixed plastic according to claim 1, it is characterized in that: in step one, when the aqueous solution be immersed in by mixed plastic particles containing wetting agent carries out surface modification, mechanical stirring is adopted to promote the absorption of wetting agent, stir speed (S.S.) is 50 ~ 200 revs/min, and the time is 10 ~ 120 minutes.
8. the separation method of a kind of mixed plastic according to claim 1, it is characterized in that: in step 2, mixed plastic particles after step one gained surface modification is placed in water, under agitation condition and/or ultrasound condition, wash-out is after 2 ~ 20 minutes, solid-liquid separation, gained solid is mixed plastic particles after wash-out; The speed of described stirring is 200 ~ 800 revs/min, and described ultrasonic power is 20 ~ 100kW.
9. the separation method of a kind of mixed plastic according to claim 1, it is characterized in that: in step 3, in mass ratio, flotation fluid: mixed plastic particles=9-99:1 after wash-out, mixed plastic particles after step 2 gained wash-out is added in flotation fluid, carries out flotation; Described flotation fluid is made up of water and minerals, and the pH value of flotation fluid is 4 ~ 8; In flotation fluid, the concentration of inorganic salt is 100 ~ 2000mg/L; Described inorganic salt are selected from least one in sodium-chlor, aluminum chloride, calcium chloride, Repone K, sodium carbonate, salt of wormwood, magnesium chloride, iron(ic) chloride, magnesium sulfate.
10. the separation method of a kind of mixed plastic according to claim 1, it is characterized in that: in step 3, during flotation, add pore forming material, described pore forming material is selected from least one in pine camphor oil, methyl isobutyl carbinol, isooctyl alcohol, and described frother dosages is 1 ~ 100g/t plastics.
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| CN108247897A (en) * | 2017-12-05 | 2018-07-06 | 郑州大学 | A kind of separation method of mixed plastic |
| CN110421744A (en) * | 2019-07-29 | 2019-11-08 | 中南大学 | A method of based on carbonic acid Calcium preconditioning from waste and old mixed plastic FLOTATION SEPARATION polyvinyl chloride |
| CN111409212A (en) * | 2019-01-07 | 2020-07-14 | 中南大学 | Waste mixed plastic full-priority flotation separation method based on calcium hydroxide pretreatment |
| CN111409213A (en) * | 2019-01-07 | 2020-07-14 | 中南大学 | Waste mixed plastic full-priority flotation separation method based on calcium sulfate pretreatment |
| CN116589870A (en) * | 2023-05-17 | 2023-08-15 | 深圳市新创源精密智造有限公司 | Processing method for recycling SMD braid waste and application of method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108247897A (en) * | 2017-12-05 | 2018-07-06 | 郑州大学 | A kind of separation method of mixed plastic |
| CN108247897B (en) * | 2017-12-05 | 2019-10-25 | 郑州大学 | A kind of separation method of mixed plastic |
| CN111409212A (en) * | 2019-01-07 | 2020-07-14 | 中南大学 | Waste mixed plastic full-priority flotation separation method based on calcium hydroxide pretreatment |
| CN111409213A (en) * | 2019-01-07 | 2020-07-14 | 中南大学 | Waste mixed plastic full-priority flotation separation method based on calcium sulfate pretreatment |
| CN111409212B (en) * | 2019-01-07 | 2021-07-09 | 中南大学 | Waste mixed plastic full-priority flotation separation method based on calcium hydroxide pretreatment |
| CN111409213B (en) * | 2019-01-07 | 2021-07-09 | 中南大学 | Waste mixed plastic full-priority flotation separation method based on calcium sulfate pretreatment |
| CN110421744A (en) * | 2019-07-29 | 2019-11-08 | 中南大学 | A method of based on carbonic acid Calcium preconditioning from waste and old mixed plastic FLOTATION SEPARATION polyvinyl chloride |
| CN110421744B (en) * | 2019-07-29 | 2021-10-08 | 中南大学 | Method for flotation separation of polyvinyl chloride from waste mixed plastic based on calcium carbonate pretreatment |
| CN116589870A (en) * | 2023-05-17 | 2023-08-15 | 深圳市新创源精密智造有限公司 | Processing method for recycling SMD braid waste and application of method |
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| CN105399983B (en) | 2018-03-09 |
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