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A method for separating plastic waste

A separation method and waste technology, applied in the field of waste plastic recycling, can solve the problems of lack of efficient, cheap and environmentally friendly plastic surface treatment methods, secondary pollution, increased cost and other problems, and achieve improved treatment effect, easy separation and separation efficiency. high effect

Active Publication Date: 2020-06-16
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, homogeneous Fenton needs to pre-acidify the aqueous solution and add a large amount of iron ions, and the generated acidic waste liquid containing iron ions needs to be treated before it can be discharged, which increases the cost
[0005] In summary, the prior art waste plastic flotation separation method mainly has the defects of secondary pollution and high cost, and lacks an efficient, cheap and environmentally friendly plastic surface treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The polycarbonate and polyvinyl chloride mixed plastics were crushed, 100g of plastic particles of 0.5-2.0mm, 10g of kaolin catalyst loaded with zero-valent copper, and 100g of hydrogen peroxide with a mass concentration of 30% were added to 1000mL of water, and the stirring speed was 200rpm, stir for 200min, filter out the catalyst and plastic particles and add them to the magnesium chloride aqueous solution to separate the two, the catalyst is recycled, and the plastic particles are subjected to dissolved air flotation. , the purity of polycarbonate and polyvinyl chloride after separation were 98.92% and 97.31%, and the recoveries were 97.16% and 98.69%, respectively.

Embodiment 2

[0045]Crush polycarbonate and polyvinyl chloride mixed plastics, add 800g of 0.5-2.0mm plastic particles, 800g of carbonized circuit board catalyst and 160g of potassium peroxodisulfate into 1000mL of water, ultrasonic power is 200kW, ultrasonic for 10min, filter out The catalyst and plastic particles are added to the magnesium chloride aqueous solution to separate the two, the catalyst is recycled, and the plastic particles are subjected to dissolved air flotation. The flotation conditions are that the pressure of the dissolved air tank is 0.1MPa and the flotation time is 30min. The purity of polyvinyl chloride was 96.45% and 98.22%, and the recoveries were 97.98% and 96.74%, respectively.

Embodiment 3

[0047] The polyethylene terephthalate and polyvinyl chloride waste plastics were crushed, and 500g of plastic particles with a particle size of 0.5-1.2mm, 50g of montmorillonite catalyst loaded with zero-valent aluminum and 100g of potassium peroxomonosulfate were added to the In 1000mL water, stir at 800rpm, stir for 80min, filter out the catalyst and plastic particles and add them to the calcium nitrate aqueous solution to separate the two. The catalyst is recycled, and the plastic particles are subjected to dissolved air flotation. The flotation condition is that the pressure of the dissolved air tank is 0.3MPa. 1. The flotation time is 12 minutes, the purity of polyethylene terephthalate and polyvinyl chloride after separation is greater than 95.83%, and the recovery rate is greater than 96.99%.

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Abstract

The invention relates to a method of separating plastic waste and belongs to the technical field of waste plastic recovery. According to the method provided by the invention, agent-free dissolved airfloatation of the waste plastics is achieved by modifying surfaces of the plastics through heterogeneous catalytic oxidation by means of a non-magnetic catalyst and intensifying surface wettability difference of different plastics. The invention provides an efficient plastic waste separating technology which has the advantages of being high in adaptability of raw materials, high in separating efficiency, environment-friendly and the like and provides a technical support for cyclic utilization of the waste plastic resource.

Description

technical field [0001] The invention relates to a method for separating waste and old mixed plastics, belonging to the technical field of waste and old plastics recycling. Background technique [0002] With the wide application of plastics and the rapid development of the plastics industry, the world's annual plastic production is increasing year by year. Due to the short life cycle of plastics, a large amount of waste plastics are produced. The incineration and landfill treatment of waste plastics have caused serious waste of resources and environmental pollution, and more and more attention has been paid to the recycling of waste plastics. The recycling process of waste plastics mainly includes collection, separation and reprocessing. At present, the separation of mixed plastics is the bottleneck link in the recycling of waste plastics. [0003] Flotation can realize the separation of mixed plastics with similar density and charging properties, and has good cost and techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/02B29B17/04C08J11/16C08L69/00C08L27/06
CPCB29B17/02B29B17/0412B29B2017/0015B29B2017/0203B29B2017/0244C08J11/16C08J2327/06C08J2369/00Y02P20/584Y02W30/62
Inventor 王重庆曹亦俊
Owner ZHENGZHOU UNIV