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Method for flotation separation of PET from PVC based on low-temperature plasma induction

A low-temperature plasma and plasma technology, used in solid separation, chemical instruments and methods, wet separation, etc., can solve the problems of low efficiency, high cost, poor environmental protection, etc., and achieve simple process, cost saving, and reduction of secondary The effect of pollution

Inactive Publication Date: 2021-04-02
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for separating PET and PVC based on low-temperature plasma-induced flotation, so as to solve the problems of high cost, low efficiency and poor environmental protection in the existing separation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, the feed composition is a mixture of PET and PVC products, and its sources are building accessories and beverage bottles respectively. The mass ratio distribution of the two is close to 1, and the separation operation method is as follows:

[0029] (1) Pretreatment step 1: Soak in tap water containing detergent decontamination powder, stir and feed for 10 minutes to remove stains, then re-wash with tap water to remove detergent, and use a small pulverizer to crush after solid-liquid separation. The sieve controls the thickness of the smallest size in the three-dimensional of the coarse debris to be less than 10mm, and completes the feeding into sheets;

[0030] (2) Plasma contact induction: The mixed plastic in step (1) is subjected to double-sided plasma positive electrode contact under atmospheric pressure. The plasma is generated in the atmosphere by corona discharge (corona machine), and the process is controlled. The unit activation energy induced ...

Embodiment 2

[0034] In this example, the feed composition is a mixture of PET and PVC products, and its sources are toys and fresh-keeping boxes respectively. The mass ratio distribution of PET and PVC is close to 0.43:1. The separation operation method is as follows:

[0035](1) Pretreatment step 1: Soak in tap water containing detergent decontamination powder, stir and feed for 10 minutes to remove stains, then re-wash with tap water to remove detergent, and use a small pulverizer to crush after solid-liquid separation. The sieve controls the thickness of the smallest size in the three-dimensional of the coarse debris to be less than 8mm, and completes the feeding into sheets;

[0036] (2) Plasma contact induction: The mixed plastic in step (1) is subjected to double-sided plasma positive electrode contact under atmospheric pressure. The plasma is generated in the atmosphere by corona discharge (corona machine), and the process is controlled. The unit activation energy induced by plasma ...

Embodiment 3

[0040] The feeding composition of this embodiment is a mixture of PET and PVC products, and its sources are toys and fresh-keeping boxes respectively. The mass ratio distribution of PET and PVC is close to 0.43. The operation method for its separation is:

[0041] (1) Pretreatment step 1: Soak in tap water containing detergent decontamination powder, stir and feed for 10 minutes to remove stains, then re-wash with tap water to remove detergent, and use a small pulverizer to crush after solid-liquid separation. The sieve controls the thickness of the smallest size in the three-dimensional of the coarse debris to be less than 6mm, and completes the feeding into sheets;

[0042] (2) Plasma contact induction: The mixed plastic in step (1) is subjected to double-sided plasma positive electrode contact under atmospheric pressure. The plasma is generated in the atmosphere by corona discharge (corona machine), and the process is controlled. The unit activation energy induced by plasma...

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Abstract

The invention belongs to the technical field of solid waste pollution control and recycling, and relates to a method for flotation separation of PET from PVC based on low-temperature plasma induction.According to the method, polyvinyl chloride (PVC) and polyethylene glycol terephthalate (PET) with different sources and mass ratios are used as feed materials, four process links (pretreatment step1, plasma contact induction, pretreatment step 2 and a flotation unit) are sequentially connected in series, the flotation unit is used for discharging, a floating product is PET, and a sinking tailing is separated PVC. The method has the advantages of simple process, no solvent addition in the plasma contact induction process, no use of an oxidant and an additional catalytic agent, no toxicity orharm to the environment, cost saving, effective reduction of the secondary pollution of the water body, simple operation, and facilitation of industrial large-scale application.

Description

technical field [0001] The invention belongs to the technical field of solid waste pollution prevention and resource utilization. Specifically, it relates to a flotation separation technology, in particular to a method of using low-temperature plasma-induced modification as a pretreatment to enhance the flotation separation of mixed plastics PET and PVC. Methods. Background technique [0002] The economic and environmental losses caused by waste plastics are becoming more and more serious, and its proportion in common solid waste streams such as domestic waste continues to grow, and resource disposal has attracted widespread attention. Polyethylene terephthalate (PET) and polyvinyl chloride (PVC) are widely used in the disposable packaging industry due to their excellent thermal processing performance and stability, and there are obvious differences in the recycled waste. Coexistence relationship, difficult to separate by manual sorting. Among them, waste PET has high reus...

Claims

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Application Information

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IPC IPC(8): B03B5/28B29C71/00
CPCB03B5/28B29C71/0081
Inventor 赵钺韩凤荣郭林奕张军耿雅妮陈静王科
Owner BAOJI UNIV OF ARTS & SCI
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