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A separation method for mixed plastics

A technology of mixing plastics and separation methods, which is applied in the field of waste plastic recycling, can solve problems such as unsatisfactory separation effects, achieve stable flotation results, high-efficiency separation, and meet the effects of industrial applications

Active Publication Date: 2018-03-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few studies on the separation of waste plastics by flotation, and wetting agents are used to directly adjust the plastics for flotation. Generally, the difference in the adsorption of different plastics by wetting agents is small, so the separation effect is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Crush PVC and PET mixed plastics, take 150g of plastic particles with a particle size of 0.5-1.0cm, add them to 10g / L sodium lignosulfonate aqueous solution, add 90mg / L magnesium sulfate to the aqueous solution, and adjust the pH to 7.5 , the mechanical stirring rate is 100 rpm, the stirring time is 90 minutes, then put the mixed plastic into tap water, ultrasonic cleaning, the power is 20kW, the time is 5 minutes, and then carry out flotation, the flotation condition is: 30g / t Methyl isobutyl methanol, flotation for 4min, pH is 7.8, 2000mg / L sodium carbonate is added to the flotation medium. After separation, the purities of PVC and PET are respectively 99.6% and 98.3%, and the recovery rate is greater than 98%.

Embodiment 2

[0035] Crush ABS and PS mixed plastics, take 100g of plastic particles with a particle size of 0.1-1.0cm, add them to 1g / L calcium lignosulfonate aqueous solution, add 20mg / L magnesium chloride to the aqueous solution, and adjust the pH to 4.8, The mechanical stirring rate is 50 rpm, the stirring time is 20 minutes, then the mixed plastics are put into tap water, ultrasonically cleaned, the power is 80kW, the time is 2 minutes, and then flotation is carried out. The flotation conditions are: 80g / t Isooctyl alcohol, flotation for 6min, pH is 5, 1000mg / L magnesium chloride is added to the flotation medium. The purities of PVC and PET after separation are 94.3% and 95.3% respectively, and the recovery rate is greater than 96.2%.

Embodiment 3

[0039] Crush PVC and PET mixed plastics, take 100g of plastic particles with a particle size of 0.5-2.0cm, add them to 8g / L ammonium lignosulfonate aqueous solution, add 10mg / L sodium chloride to the aqueous solution, and adjust the pH to 6.8, the mechanical stirring rate is 180 rpm, the stirring time is 110 minutes, then put the mixed plastic into distilled water, the mechanical stirring rate is 800 rpm, the stirring time is 20 minutes, and then carry out flotation, the flotation conditions are : 40g / t pinitol oil, flotation 8min, pH is 5, 200mg / L calcium chloride is added in the flotation medium. After separation, the purities of PVC and PET are 92.6% and 94.3% respectively, and the recovery rate is greater than 95.8%.

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PUM

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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 [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] Plastics are widely used in human life and production. The rapid development of the plastics industry, the large consumption of plastics and the short life cycle of plastic products have led to a sharp increase in the amount of plastic waste. The disposal methods of waste plastics are incineration and landfill, resulting in serious environmental pollution and waste of resources. Therefore, the recycling of waste plastics has been highly valued. For the recycling process of waste plastics, it is necessary to separate different plastics. At present, the separation of plastics is the bottleneck link restricting the recycling process of waste plastics. [0003] The mixed plastics separation technologies developed include methods such as manual sorting, gravity separation, flotat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/06
CPCC08J11/06C08J2325/06C08J2327/06C08J2355/02C08J2367/02Y02W30/62
Inventor 王重庆王晖符剑刚黄锣锣
Owner CENT SOUTH UNIV
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