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A method for recycling para-aramid fiber spinning waste

A technology of para-aramid fiber spinning and processing method is applied in the field of recycling and processing para-aramid fiber spinning waste, which can solve the problems of non-compliance with environmental protection requirements and large waste losses, and achieve resource reuse, improve recycling, The effect of reducing production costs

Active Publication Date: 2021-06-11
JIANGSU RUISHENG ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no recovery device for relevant waste in the existing production equipment, and the direct disposal of this waste will cause a great loss, and it does not meet the current environmental protection requirements

Method used

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  • A method for recycling para-aramid fiber spinning waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The para-aramid spinning waste is sent to a crusher for crushing to obtain small particles with a particle size of 4 mm. Then send it into the washing tank, put in enough water to submerge it, let out the washing water after soaking for 0.5 hours, and then circulate and soak in water for 3 times in this way. The washing water can be sent to the reaction tank, and the washings are sent to the pressure filter to obtain the filtrate. After filtering, the filter cake is sent to a vacuum dryer at 100°C for drying (vacuum degree -0.06MPa, drying time 5hr) in order to obtain aramid fiber powder. The filtrate enters the storage tank, and then is sent to the reaction tank equipped with soda lime, and the by-product of salt (calcium sulfate) is obtained from the reaction.

Embodiment 2

[0026] The para-aramid spinning waste is sent to a crusher for crushing to obtain small particles with a particle size of 6 mm. Then send it into the washing tank, put in enough water to submerge it, let out the washing water after soaking for 1 hour, and then cycle soaking and washing in this way for 5 times. The washing water can be sent to the reaction tank, and the washings are sent to the pressure filter to obtain the filtrate. After filtering, the filter cake is sent to a vacuum dryer at 120°C for drying (vacuum degree -0.05MPa, drying time 4hr) in order to obtain aramid fiber powder. The filtrate enters the storage tank, and then is sent to the reaction tank filled with magnesium carbonate, and the by-product of salt (magnesium sulfate) is obtained from the reaction.

Embodiment 3

[0028] The para-aramid spinning waste is sent to a crusher for crushing to obtain small particles with a particle diameter of 5 mm. Then send it into the washing tank, put in enough water to submerge it, let out the washing water after soaking for 2 hours, and then cycle soaking and washing in this way for 6 times. The washing water can be sent to the reaction tank, and the washings are sent to the pressure filter to obtain the filtrate. After filtering, the filter cake is sent to a vacuum dryer at 80°C for drying (vacuum degree -0.04MPa, drying time 3hr) in order to obtain aramid fiber powder. The filtrate enters the storage tank, and then is sent to the reaction tank filled with barium chloride, and the by-product of salt (barium sulfate) is obtained from the reaction.

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Abstract

The invention provides a method for recycling para-aramid spinning waste, which is characterized in that the steps include: (1) sending the para-aramid spinning waste into a crusher for crushing to obtain small pieces of granular waste; 2) Send the small piece of granular waste obtained in the step (1) into a water washing tank for soaking, and circulate the water for washing and soaking, and send the washing water into the reaction tank; (3) Put the solids soaked in the step (2) The waste is washed and filtered with a pressure filter; (4) the filter cake obtained in the step (3) is sent to a vacuum dryer for vacuum drying to obtain a solid powder; (5) the filtrate obtained in the step (3) is Store it in the liquid storage tank, and then send it to the reaction tank for reaction to obtain salt by-products. The invention effectively improves the recycling of para-aramid fiber and sulfuric acid in the production process of para-aramid fiber spinning, reduces production cost, realizes resource reuse and reduces environmental pollution.

Description

technical field [0001] The invention relates to the field of chemical textiles, in particular to a method for recycling and treating para-aramid fiber spinning waste. Background technique [0002] During the production process of para-aramid fiber spinning, the slurry for washing the pipeline will be discharged, and the waste generated is mainly a mixture of poly-p-phenylene terephthalamide and concentrated sulfuric acid. The waste becomes solid after cooling, has the characteristics of high strength, high toughness, and strong corrosion, and belongs to hazardous waste that is difficult to handle in industrial production. There is no recycling device for relevant waste in the existing production equipment, and the direct disposal of this waste will cause a great loss, and it does not meet the current environmental protection requirements. [0003] The present invention intends to provide a method for recycling para-aramid fiber spinning waste, which firstly separates para-a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/00B29B17/04C01F11/46C01F5/40
CPCB29B17/00B29B17/0412C01F5/40C01F11/46C01F11/462Y02W30/52Y02W30/62
Inventor 曹煜彤赵开荣顾克军夏莹曹美荣卢铖陈超
Owner JIANGSU RUISHENG ADVANCED MATERIAL TECH CO LTD
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