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5 kinds of waste plastic sorting technology features

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5 kinds of waste plastic sorting technology features
5 kinds of waste plastic sorting technology features

 

Mixed waste plastics are difficult to recycle or reuse, and the value of waste plastics must be classified to achieve effective recycling. There are many sorting techniques for plastics, including vibration sorting, air separation, liquid sorting, electromagnetic sorting and photoelectric sorting.

1 vibration sorting technology

The vibration sorting technology utilizes the reciprocating motion of the vibrating bed to drive the vibration of the material on the bed surface. The main principle is to use the frictional force and inertial force generated between the material and the bed surface to form different displacement movements of the material particles, and achieve the separation effect by the displacement difference between the material particles. Vibration sorting works well when sorting materials with large differences in density.

 

5 kinds of waste plastic sorting technology features

Vibration sorting effect of 75% plastic and 25% metal mixed materials

 

2 airflow sorting technology

Air separation, also known as wind sorting, by blowing a mixture of waste plastic and other materials by airflow, the density of the material is relatively close, and the light-weight material is far away, thereby achieving material sorting.

5 kinds of waste plastic sorting technology features

Density range of different plastics

 

Spiral airflow sorting

5 kinds of waste plastic sorting technology features

 

Pneumatic, fluidized bed sorting

5 kinds of waste plastic sorting technology features

Schematic diagram of pneumatic and fluidized bed sorting equipment

 

3 liquid sorting technology

The liquid sorting technology utilizes the difference in density between liquid and plastic particles to achieve sorting of different types of waste plastics. The study found that the factors affecting the sorting effect are the density of plastic materials, the properties and size of plastic materials.

5 kinds of waste plastic sorting technology features

Flow sorting effect of waste plastics of different shapes and sizes

 

Grading flow sorting

5 kinds of waste plastic sorting technology features

Schematic diagram of fractional liquid flow sorting equipment

 

Hydraulic fluid flow sorting

5 kinds of waste plastic sorting technology features

Hydraulic fluid flow separation equipment structure and physical map

 

4 electromagnetic sorting technology

Magnetic separation technology is a technique that uses magnetic differences of various materials to perform sorting under the action of magnetic force and other forces. Electrostatic separation technology uses a variety of plastics with different electrical conductivity and electrostatic properties of the electric field on the plastic for sorting. Electromagnetic sorting technology is a combination of electrostatic action and magnetic sorting.

5 kinds of waste plastic sorting technology features

Frictional charging sequence of plastic

 

5 kinds of waste plastic sorting technology features

Electromagnetic sorting equipment

 

5 optical sorting technology for plastic

Photoelectric separation is based on the automatic separation of different plastics in spectral properties, and is divided into absorption spectrum (such as infrared, ultraviolet absorption spectrum), emission spectrum (such as fluorescence spectrum) and scattering spectrum (such as Raman spectrum). Wait for 3 types. The three elements of the analytical infrared spectrum of a plastic material are the peak position, shape and intensity.

Sensor-based sorting system

According to the detection principle of sensor sorting, automatic sorting technology is divided into the following six categories:

Color recognition sensor (COLOR)

By analyzing the visible, infrared, ultraviolet, and other ranges of the material, the color of the material is identified for sorting.

Near infrared sensor (NIR)

The sorting judgment is performed according to different reflection spectra exhibited by different materials.

X-ray perspective (XRT)

Sorting is judged according to the different atomic densities of different kinds of materials.

Electromagnetic sensor (EM)

The sorting is judged according to the different conductivity and magnetic permeability of the material.

Visible spectrum sensor (VIS)

Visible spectrum recognition and sorting judgment for transparent and opaque materials.

X-ray fluorescence technology (XRF)

The sorting judgment is made according to the atomic characteristics of the material.

5 kinds of waste plastic sorting technology features

 

Pub Time : 2019-10-04 17:03:03 >> News list
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