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Recovery method for waste plastics through anhydrous cleaning

A waterless cleaning technology for waste plastics, applied in plastic recycling, mechanical material recycling, recycling technology, etc., can solve the problems of large water consumption, low purity, and difficult removal of highly adhesive debris, etc., to achieve thorough cleaning, craft brief effects

Active Publication Date: 2017-11-24
安徽省家家乐塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cleaning and impurity removal of existing waste plastics is basically done with water, which not only consumes a lot of water, but also produces a large amount of sewage, and the cleaning effect is not good, and it is difficult to remove some highly adhesive sundries such as grease and ink.
The recycled plastics produced from this have problems such as low strength, poor color, low purity, poor hand feeling, rough surface and low utilization rate. They can only be used as inferior plastics in some low-value fields and cannot be used very well. Realize the effective utilization of waste plastics
Hinders the development of high-quality recycling of waste plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Send the collected waste plastic products into the vibrating screen, the mesh size of the vibrating screen is 10-30mm, and at the same time pass through the hot air at 40-50°C, while drying the waste plastics, use the vibrating action of the vibrating screen to screen out large Granular soil, gravel, iron filings, etc., and loosen waste plastics, exposing the surface of waste plastic sheets and films;

[0027] (2) The waste plastics pre-screened in step (1) were crushed to pass through a 20-mesh sieve to obtain waste plastic powder, and the waste plastic powder, alumina ceramic particles with a particle size greater than 3mm, and sodium hydroxide were mixed in a mass ratio of 1: 0.1:0.01 mixing, rotating at a speed of 15rpm in a horizontal rotating cylinder, during the rotation process, the highly adhesive grease, ink and other impurities in sodium hydroxide waste plastics are activated, and the micro-friction and grinding effect produced by the hard characteristics ...

Embodiment 2

[0033] (1) Use a slitter to cut the collected waste plastics into pieces within 10cm, send them to the vibrating screen, and pass hot air at the same time, while drying the waste plastics, use the vibrating action of the vibrating screen to screen out large particles of soil, Sand, gravel, iron filings, etc., and make the waste plastic loose, so that the surface of the waste plastic is exposed;

[0034](2) The waste plastics pretreated in step (1) are crushed to pass through a 20-mesh sieve to obtain waste plastic powder, and the waste plastic powder is mixed with corundum particles with a particle size greater than 3mm and sodium carbonate at a mass ratio of 1:0.15:0.03 , rotate in a horizontal rotating cylinder at a speed of 30rpm for 35min. During the rotation process, sodium carbonate activates highly adhering impurities such as grease and ink, and uses the micro-friction and grinding effect produced by hard corundum to adhere the surface of waste plastic powder. Dirt, gre...

Embodiment 3

[0038] A method for anhydrous cleaning and recycling of waste plastics, characterized in that: the waste plastics are cleaned by micro-friction, grinding and stripping of hard inorganic particle quartz sand, and the specific cleaning method is as follows:

[0039] (1) Send the collected waste plastics into the vibrating screen and feed hot air at the same time. While drying the waste plastics, use the vibration of the vibrating screen to screen out large particles of soil, sand, iron filings, etc., and loosen the waste plastics , making the surface of the waste plastic exposed;

[0040] (2) The waste plastics pretreated in step (1) were crushed to pass through a 20-mesh sieve to obtain waste plastic powder, and the waste plastic powder was mixed with quartz sand and potassium hydroxide at a mass ratio of 1:0.2:0.02, and the The rotating cylinder rotates at a speed of 20rpm for 20min. During the rotation, the stripping agent activates highly adhesive impurities such as grease a...

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Abstract

The invention relates to the field of waste recycled plastics, in particular to a recovery method for waste plastics through anhydrous cleaning. According to the recovery method, by adding hard inorganic matter and auxiliary dry powder stripping agents to waste plastic powder, by rotating in a horizontal rotary drum in a dry state, through activation of the stripping agents on highly adhering impurities such as grease and ink during rotation, and through the micro-friction grinding effect generated by hard inorganic particles, the soil, grease and ink on the surface of the waste plastic powder are exfoliated; and the exfoliated fine impurities such as soil, grease and ink are further separated through a cyclone separator; and efficient cleaning of the waste plastics under the anhydrous condition is achieved. According to the recovery method, the highly adhering impurities such as the soil, grease, and ink are effectively removed; and the cleaning process is closed without pollutant discharge, and the recovery method is short in process and continuous in operation, and is of great significance to high-quality recovery and use of waste plastics.

Description

technical field [0001] The invention relates to the field of recycled plastics, in particular to a method for anhydrous cleaning and recycling of waste plastics. Background technique [0002] Since the formation of the modern plastics industry in 1930, after more than 80 years of rapid development, the plastics industry has become the mainstay of light industry. While the wide application of plastic products has also produced huge plastic pollution, it has caused great damage to the global ecological environment. At present, landfill and incineration are the main treatment methods for waste plastic waste. However, landfill treatment increases the pressure on land resources due to its large space occupation. At the same time, waste plastic is difficult to degrade, which seriously hinders water infiltration and groundwater. Circulation, and secondly, the additives in waste plastics will cause secondary pollution to the land. Incineration treatment CO, polycyclic aromatic hyd...

Claims

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Application Information

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IPC IPC(8): B29B17/00B29B17/02B29B17/04
CPCB29B17/00B29B17/02B29B17/0404B29B2017/0224B29B2017/0231Y02W30/52Y02W30/62
Inventor 陈庆曾军堂
Owner 安徽省家家乐塑料制品有限公司
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