Sorting method and equipment for reprocessed plastic

A technology for recycled plastics and sorting, applied in the field of waste recycling, can solve the problems of difficult to achieve high-purity raw material grade standards, difficult to achieve automatic flow operations, uneven processing conditions, etc., to achieve low cost, easy to implement, The effect of less environmental pollution

Active Publication Date: 2013-05-22
常州金坛鑫岗橡塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrostatic method, color sorting method, temperature difference method, polar flotation method, foam flotation method, etc. It is difficult to reach the high-purity raw material grade standard due to the shape, quality, and inhomogeneity and constancy of the selected materials.
However, the pressurized thermal dissolution method is difficult to realize automatic flow operation due to the long time and complicated process, thus resulting in high sorting cost and difficult to popularize.

Method used

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  • Sorting method and equipment for reprocessed plastic
  • Sorting method and equipment for reprocessed plastic
  • Sorting method and equipment for reprocessed plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A sorting method for recycled plastics, comprising the steps of:

[0043] (1) Crush the materials to be separated containing plastics A and B, remove impurities in the materials, and set aside;

[0044] (2) Add a solvent to the material to fully swell A; the solvent swells A but not B;

[0045] (3) Beating the swollen material, crushing the swollen A into a slurry, and obtaining a slurry of A and a mixture of B;

[0046] (4) Sorting the mixture of the slurry of A and B, drying the sorted plastic B to obtain plastic B; spray drying the slurry of A, and then centrifugally granulating to obtain plastic A.

Embodiment 2

[0048] The plastic A is PVC, the plastic B is PET, and the solvent is tetrahydrofuran.

[0049] Follow the steps below to sort:

[0050] (1) Crush the material to be separated containing plastic PVC and PET, the diameter of the crushed material is less than 1cm, remove the impurities in the material, and set aside;

[0051] (2) Add tetrahydrofuran to the material to fully swell PVC;

[0052] (3) Beating the swollen material, crushing the swollen PVC into pulp to obtain a mixture of PVC slurry and PET;

[0053] (4) Sorting the mixture of PVC slurry and PET, drying the sorted PET to obtain PET; spray-drying the PVC slurry, and then centrifugally granulating to obtain PVC.

Embodiment 3

[0055] Plastic A is PVC, plastic B is PET, and solvent uses cyclohexanone.

[0056] Follow the steps below to sort:

[0057] (1) Crush the material to be separated containing PVC and PET, the diameter of the crushed material is less than 1cm, remove the impurities in the material, and set aside;

[0058] (2) Add cyclohexanone to the material to fully swell PVC;

[0059] (3) Beating the swollen material, crushing the swollen PVC into pulp to obtain a mixture of PVC slurry and PET;

[0060] (4) Sorting the mixture of PVC slurry and PET, drying the sorted PET to obtain plastic PET; spray-drying the PVC slurry, and then centrifugally granulating to obtain PVC.

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PUM

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Abstract

The invention discloses a sorting method and equipment for reprocessed plastic. The method comprises the following steps of: (1) smashing a material containing plastic A and B to be separated, and removing impurities out of the material for later use; (2) adding a solvent into the material so as to completely swell the plastic A, wherein the plastic B is not swelled; (3) pulping the swelled material, and pulping the swelled plastic A to obtain a mixture of slurry of A and B; (4) sorting the mixture of the slurry of A and B, and drying the sorted plastic B to obtain plastic B; and separating the slurry of A to obtain plastic A. The method and the equipment can be used for thoroughly solving the technical problem in sorting of reprocessed plastic and have the characteristics of high separation purity, simple method and structure, and low cost.

Description

technical field [0001] The invention relates to the technical field of recycling plastics or waste materials containing other plastic components. Background technique [0002] Plastics are widely used in various fields due to their excellent properties such as anti-drop, wear-resistant, easy to use, and low cost. With the development of society, the development of plastic technology is changing with each passing day. The number of plastic products is gradually increasing, and the output has increased significantly year by year. Many production processes are different, and the mixed waste plastics make recycling very difficult. Therefore, the waste plastic recycling process has become a major problem in the world today. [0003] At present, there are many recycling methods for waste plastics. As far as PET and PVC are concerned, there are electrostatic methods, color sorting methods, temperature difference methods, polar flotation methods, foam flotation methods, and pressur...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08L27/06C08L67/02
CPCY02W30/62
Inventor 恽国华
Owner 常州金坛鑫岗橡塑有限公司
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