Method for dry cleaning of waste plastic by using gas-solid fluidized bed

A waste plastic, dry cleaning technology, used in plastic recycling, recycling technology and other directions, can solve the problems of difficult to remove strong sticky grease on the surface, adapt to a single variety, poor cleaning effect, etc., to achieve strong physical adsorption capacity and good effect. , Reduce the effect of capillary adhesion

Inactive Publication Date: 2017-09-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the disadvantages of the existing waste plastic dry cleaning technology, such as poor selectivity, single adaptable variety, complex process, poor cleaning effect, and difficult re

Method used

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  • Method for dry cleaning of waste plastic by using gas-solid fluidized bed
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  • Method for dry cleaning of waste plastic by using gas-solid fluidized bed

Examples

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Effect test

Embodiment 1

[0025] according to figure 1 The process uses waste plastics sorted from municipal waste as raw materials and puts them into a shear crusher to reduce the size of waste plastics to 10-30 mm. Add water-washed quartz sand with a particle size of 0.3-0.5 mm to the fluidized bed equipment with a stirring device, so that the static height of the cleaning medium in the bed reaches 55 mm. The crushed waste plastics are added into the fluidized bed, and an antistatic agent is sprayed on the surface of the waste plastics. The ratio of crushed waste plastics to quartz sand particles is 1:50, and the amount of antistatic agent is 1 / 100 of the mass of waste plastics. Turn on the high-pressure fan to make the superficial gas velocity reach 0.25 m / s, turn on the heating temperature control system to keep the temperature at 40°C, turn on the stirring device to keep the speed at 90 rpm (at this time, the pressure drop of the fluidized bed layer is 800Pa) , and maintain the cleaning time for...

Embodiment 2

[0027] according to figure 1 The process uses waste plastics sorted from municipal waste as raw materials and puts them into a shear crusher to reduce the size of waste plastics to 10-30 mm. Add water-washed quartz sand with a particle size of 0.3-0.5 mm to the fluidized bed equipment with a stirring device, so that the static height of the cleaning medium in the bed reaches 25 mm. Put the crushed waste plastics into the fluidized bed equipment, and spray the antistatic agent on the surface of the waste plastics. The ratio of crushed waste plastics to quartz sand is 1:20, and the amount of antistatic agent is 1 / 100 of the mass of waste plastics. Turn on the high-pressure fan to make the superficial gas velocity reach 0.17 m / s, keep the air flow at room temperature 20°C, turn on the stirring device to keep the speed at 90 rpm (at this time, the pressure drop of the fluidized bed layer is 330Pa), and maintain the cleaning time 10 minutes. During cleaning, the cyclone separato...

Embodiment 3

[0029] according to figure 1 The process uses waste plastics sorted from municipal solid waste as raw materials and puts them into a shear crusher to reduce the size of waste plastics to 10-30 mm. The broken waste plastics were dry-cleaned twice, and the operating conditions were the same as in Example 2. In this embodiment, the overall cleaning rate of waste plastics is 98.0%. The obtained plastic sheets and films have smooth surfaces without visible particles and grease impurities. The cleaning effect is equivalent to that of alkaline water washing. See figure 2 , image 3 .

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Abstract

The invention provides a method for dry cleaning of waste plastic by using a gas-solid fluidized bed. The method specifically comprises five steps of pretreatment, adjustment, cleaning, separation, purification and recycling of a fluidizing medium. An airflow feeding bed layer is used for fluidizing a bed material by the drag force; the stirring is performed to enable the waste plastic to fully contact with a gas-solid two-phase medium in a gas-solid medium fluidized bed; under coaction of friction, collision, volatilization, absorption and fluidized mass transfer, various impurities on the surface of the waste plastic are effectively removed; and the fluidizing medium is heated for recycling. The method can clean regenerated plastic materials for dealing with multiple purposes, and can effectively remove stubborn printing impurities.

Description

technical field [0001] The invention relates to a dry cleaning method for waste plastics, which belongs to the new technology of solid waste treatment in the field of environmental protection and resource comprehensive utilization, and is especially suitable for surface purification and recycling of various sheet-shaped polymer wastes. Background technique [0002] During the process of use, stacking, transportation and recycling, plastics inevitably adhere to various impurities, such as soil, food residues, grease, etc. After being discarded, these impurities will affect the sorting efficiency of plastics during recycling and Reduce the performance of recycled plastic products. At present, the surface purification methods of waste plastics are mainly water-based cleaning methods, including the use of acid, lye and cleaning solutions. Washing not only consumes a lot of water resources and chemicals, but also produces acidic, alkaline or sewage containing cleaning agents, wh...

Claims

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Application Information

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IPC IPC(8): B29B17/00B29B17/02B29B17/04
CPCB29B17/00B29B17/02B29B17/04B29B2017/0015B29B2017/0224B29B2017/0476Y02W30/62
Inventor 张付申夏冬
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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