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Separating method of waste dust filter bag containing PPS and PTFE and separating system

A separation method and separation system technology, applied in the field of dust bag recycling, can solve the problems of increased recycling cost and impact on the performance of recycled materials, and achieve the effects of high separation efficiency, environmental friendliness, and less doping

Inactive Publication Date: 2020-05-12
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of the separation liquid in this method, if the separation liquid cannot be effectively removed, it will also affect the performance of the recycled material, and it also brings the problem of separation liquid recovery, and the recovery cost is greatly increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Melt the waste dust filter bags containing PPS and PTFE after dedusting at 200°C for 8 minutes.

[0030] (2) Crushing or dicing the mixture.

[0031] (3) The granular mixture passing through the rollers is squeezed and torn, the pressure per unit length of the roller is 40N / cm, the line speed of the fast roll is 15m / s, the line speed of the slow roll is 14m / s, the line between the rolls The speed difference is 1m / s, and then the PTFE is sucked out through the suction port; the PPS is collected from the lower port, so that the PPS and PTFE fibers can be separated.

Embodiment 2

[0033] (1) Melt the waste dust filter bags containing PPS and PTFE after dedusting at 220°C for 5 minutes.

[0034] (2) Crushing or dicing the mixture.

[0035] (3) The granular mixture passing through the rollers is squeezed and rubbed, the pressure per unit length of the roller is 50N / cm, the line speed of the fast roll is 16m / s, the line speed of the slow roll is 12m / s, the line between the rolls The speed difference is 4m / s, and then the PTFE is sucked out through the suction port; the PPS is collected from the lower port, so that the PPS and PTFE fibers can be separated.

Embodiment 3

[0037] (1) Melt the waste dust filter bags containing PPS and PTFE after dedusting at 240°C for 2 minutes.

[0038] (2) Crushing or dicing the mixture.

[0039] (3) The granular mixture passing between the rollers is squeezed and rubbed torn, the pressure per unit length of the roller is 60N / cm, the line speed of the fast roll is 18m / s, the line speed of the slow roll is 11m / s, the line between the rolls The speed difference is 7m / s, and then the PTFE is sucked out through the suction port; the PPS is collected from the lower port, so that the PPS and PTFE fibers can be separated.

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PUM

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Abstract

The invention belongs to the field of dust filter bag recycling and particularly discloses a separating method of a waste dust filter bag containing PPS and PTFE. The separating method comprises the following steps: 1, carrying out hot melting on the waste dust filter bag containing PPS and PTFE at certain temperature to obtain a mixture with PPS completely melting and PTFE keeping the fibril state; 2, carrying out crushing or pelletizing treatment on the mixture obtained in the step 1 to obtain a granular mixture; 3, extruding, twisting and tearing the granular mixture obtained in the step 2to form a mixture of PTFE fibers and PPS powder; and 4, separating PPS and PTFE fibers in the mixture obtained in the step 3. The invention further discloses a separating system of the separating method. The separating method and the separating system are high in separating efficiency, the separated recycled material is less in doping, and the two types of materials after separation have application value and are environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of recycling dust removal bags, and in particular relates to a separation method and system for waste dust removal filter bags containing PPS and PTFE. Background technique [0002] At present, dust filter bags containing PPS and PTFE are widely used in soot filtration in chemical industry, coal-fired power plants, cement and metallurgy industries, effectively reducing the emission of coal-fired dust, but they are discarded due to damage after a period of use If the high-end dust bag cannot be effectively recycled and reused, it will also cause new environmental pollution. In recent years, more and more high-temperature dust removal bags are made of PPS and PTFE blended fibers. Due to the stable chemical properties of PTFE fibers, low surface energy, and poor compatibility with PPS, after extrusion processing, PTFE leads to material performance degradation. Since there is no effective technology to solve the separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/04B29B17/02
CPCB29B17/02B29B17/0412B29B2017/0217B29B2017/0255Y02W30/52Y02W30/62
Inventor 叶晋浦杨喆
Owner CHINESE TEXTILE ACAD