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Method for separating cotton and micro-plastic in waste textiles and laundry wastewater and application

A technology for waste textiles and microplastics, applied in plastic recycling, recycling technology, mechanical material recycling, etc., can solve problems such as inability to separate and recycle different components, limit separation efficiency, and inability to retain microplastics with small particles. Achieve simple operation, improve separation effect, and enhance the effect of magnetic effect

Inactive Publication Date: 2021-07-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition to the need to separate and recycle waste textiles, many cotton fibers and microplastics with small particles are also produced in laundry wastewater. The current separation method only uses filtration, because the filtration method cannot achieve the separation of different components. Recycling, and when the pore size of the filter device is large, although the flow rate will not be affected, the microplastics with small particles cannot be retained; and when the pore size of the filter device is small, a large pressure is required to maintain the water flow, which greatly limits the separation efficiency

Method used

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  • Method for separating cotton and micro-plastic in waste textiles and laundry wastewater and application
  • Method for separating cotton and micro-plastic in waste textiles and laundry wastewater and application
  • Method for separating cotton and micro-plastic in waste textiles and laundry wastewater and application

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Separation of paramagnetic cotton and polyester components in waste textiles using permanent magnets:

[0057] The waste textiles are pretreated and crushed into particles with a diameter less than 2 mm to obtain the pretreated waste textiles. Water is introduced into a separation pipeline with a diameter of 0.5 cm, and then the above-mentioned pretreated particles are placed in the pipeline. Put the separation pipeline vertically on the product of magnetic field strength and gradient (B▽B) Z 0~100T 2 In the magnetic field between / m.

[0058] It can be observed that the cotton component passes through the magnetic field, while the polyester component is captured by the magnetic field at a strength of 0.4-0.5T, realizing the separation of the two components, such as figure 1 shown. The infrared images of the two components after separation are shown in Figure 6 As shown, the two components were successfully separated.

Embodiment 2

[0060] Use electromagnet to separate paramagnetic cotton and polyester components in waste and old textiles. In this embodiment, the magnetic properties of paramagnetic cotton and polyester components in waste and old textiles are as follows: Figure 5 shown.

[0061] The waste textiles are pretreated and crushed into particles with a diameter less than 2 mm to obtain the pretreated waste textiles. Mix the pretreated waste textiles with water at a mass ratio of 1:10. The above mixture was placed in a separation line with a diameter of 1.5 cm. Put the separation pipeline vertically on the product of magnetic field strength and gradient (B▽B) Z 0~100T 2 In the magnetic field between / m.

[0062] It can be observed that the cotton component passes through the magnetic field, and the polyester component is captured by the magnetic field at a strength of 0.4-0.6T, realizing the separation of the two components, such as figure 2 shown. The XRD patterns of the two components a...

Embodiment 3

[0064] Separation of Antimagnetic Cotton and PET Polyester in Laundry Wastewater Using Electromagnet

[0065] Feed water and MnCl into a separation line with a diameter of 1.5 cm 2 The solution prepared according to the mass ratio of 8:1 has a solution density of 1.06g / ml. The laundry wastewater containing PET polyester and cotton particles with a particle size of less than 100 μm is passed into the pipeline to be separated. Among them, the density of PET polyester particles is 1.36g / cm 3 , the density of cotton particles is 1.40g / cm 3 .

[0066] The product of the magnetic field strength of the modulating electromagnet and the gradient (B▽B) Z at 0~100T 2 / m, place the separation line in a gradient magnetic field. It can be observed that the PET polyester component is captured by the magnetic field strength at 0.4-0.6T, and the cotton component passes through the magnetic field to realize the separation of the two components, as shown in the attached image 3 shown.

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Abstract

The invention discloses a method for separating cotton and micro-plastic in waste textiles and laundry wastewater and application. According to the separation method, to-be-separated substances are placed in a magnetic field with gradient to be separated and recycled. According to the method, the gradient magnetic field is adopted for separating the cotton and the micro-plastic in the waste textiles and the laundry wastewater for the first time, the magnetic force is different due to the fact that the magnetic susceptibility (or magnetization intensity) of paramagnetism or diamagnetism of the cotton and the micro-plastic in the same gradient magnetic field is different, and therefore the micro-plastic can be captured, separated and recycled. The method is simple and convenient to operate, large instruments and equipment are not needed, and two components can be separated only by putting a pipeline containing the to-be-separated substances into the gradient magnetic field. No matter paramagnetism or diamagnetism, the method provided by the invention can be used for rapidly separating and recycling cotton and polyester components in the waste textiles or the micro-plastic in the laundry wastewater.

Description

technical field [0001] The invention belongs to the technical field of separation and recovery, and in particular relates to a method and application for separating cotton and microplastics in waste textiles and laundry wastewater. Background technique [0002] There are two main methods for recycling waste textiles. The chemical method is to depolymerize the polymers in the textiles into monomers for recycling; the physical method is to dissolve the polymers and then regenerate them. For waste textiles containing cotton fibers (cellulose), the viscose regeneration method is currently dominant. The viscose regeneration method has a history of more than 100 years from 1904 to today. However, most waste textiles are not composed of a single fiber component, which requires the separation of various blended fiber components in the textile during the recycling process. For the most common cotton fiber / polyester blended textiles in textiles, if cotton cellulose is recovered, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/02C02F1/48
CPCB29B17/02B29B2017/0272C02F1/48Y02W30/52Y02W30/62
Inventor 张晓程宋广杰张军
Owner INST OF CHEM CHINESE ACAD OF SCI
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