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A method for separating waste mixed plastics

A technology for mixing plastics and plastics, applied in the field of waste plastic recycling, can solve the problems of limited diversity of waste plastics, high cost of selective solvents, low plastic recycling profits, etc., to achieve good economic feasibility, meet industrial applications, and low cost. Effect

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Selective solvents are expensive and organic solvents are very toxic
In addition, the low profit of plastic recycling and the diversity of waste plastics also limit the development of plastic separation technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Add mixed plastics containing PC, PS and PP to tap water containing a small amount of cleaning agent for cleaning, and then use a plastic crusher to crush it. During the mechanical crushing process, add an appropriate amount of water to the crusher to ensure that the temperature of the plastic is lower than 40°C. Add 30g of plastic particles with a particle size of 3.2 to 4.0mm (the mass ratio of PC, PS and PP is 1:1:1) into tap water, PP plastic particles are separated from the upper layer of tap water by floating and sinking, and then the PC and PS plastic particles Add it into boiling water at 100°C, treat it for 70 minutes, take it out and cool it with water, and then carry out flotation. The flotation conditions are: 200mg / L terpineol, flotation for 2 minutes, the aeration rate is 7.5mL / min, and the stirring rate is 100r / min. After separation, the purity of PC reached 86.42%, and the recovery rate reached 91.86%; the purity of PS reached 92.34%, and the recovery rate...

Embodiment 2

[0041] Add the mixed plastic containing PC, PS and PE to tap water containing a small amount of cleaning agent to clean, then freeze at -10°C, use a plastic crusher to crush it for conventional crushing, and take 30g of plastic particles with a particle size of 3.2-4.0mm ( The mass ratio of PC, PS and PE is 1:1:1) into tap water, PE plastic particles are separated from the upper layer of tap water by floating and sinking, and then PC and PS plastic particles are added to 100°C salt water for 80 minutes, Take it out and cool it with water, and then carry out flotation. The flotation conditions are: 35.1mg / L methyl isobutyl carbinol, flotation for 4min, the aeration rate is 7.5mL / min, and the stirring rate is 50r / min. After separation, the purity of PC reached 94.86%, and the recovery rate of PS reached 98.04%.

Embodiment 3

[0043] Add plastics containing ABS, PS and PP to tap water containing a small amount of sodium hydroxide for cleaning, and then use a plastic crusher to crush them. During the mechanical crushing process, add an appropriate amount of water to the crusher to ensure that the temperature of the plastics is lower than 40°C. Add 30g of plastic particles with a particle size of 3.2-4.0mm (the mass ratio of ABS, PS and PP is 1:1:1) into seawater, and the PP plastic particles are separated from the upper layer of seawater by floating and sinking, and then the ABS and PS plastic particles Add it into the water medium at 80°C, treat it for 110 minutes, take it out and soak it in water for 10 minutes to cool it down, and then carry out flotation. , the stirring rate is 50r / min. After separation, the purity of ABS reached 95.16%, the purity of PS reached 91.37%, and the recovery rate of the two plastics reached 91%.

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PUM

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Abstract

The invention discloses a method for waste mixed plastic separation. The method comprises the following steps: crushing waste mixed plastic into mixed plastic particles, adding the obtained mixed plastic particles into a liquid medium I to perform sinking and floating separation, obtaining light-component plastic particles which are smaller than the liquid medium I in density and heavy-component plastic particles which are larger than that of the liquid medium I in density through the sinking and floating separation, adding the heavy-component plastic particles into a liquid medium II to perform surface treatment at a temperature of 70-100 DEG C and performing flotation separation on the heavy-component plastic particles subjected to surface treatment through a floating agent. According to the method, a variety of plastics in waste plastics can be efficiently and selectively separated. The method is simple to operate, is low in cost and meets the industrial application and production.

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] The rapid development of the plastics industry, the massive consumption of plastics, and the short life cycle of plastics 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. The mixed plastics separation technologies developed include methods such as manual sorting, gravity separation, flotation, electrostatic separation and selective dissolution. The manual ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B29B17/00
CPCY02W30/62
Inventor 王重庆王晖符剑刚张玲玲
Owner CENT SOUTH UNIV
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