Method and device for progressively recovering and circularly applying viscose fiber spinning acid waste liquid

A technology of acid waste liquid and viscose fiber, which is applied in the fields of rayon recycling, fiber chemical characteristics, textiles and papermaking, etc.

Inactive Publication Date: 2019-03-12
JIANGSU NJU ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Technical problem: The present invention provides a solution to achieve the balance of sodium sulfate in the system, solve the resource utilization of viscose fiber spinning wastewater and near-zero discharge, and avoid the acidity of viscose fiber spinning where organic matter is enriched in the system The Method of Staged Recovery and Recycling of Waste Liquid

Method used

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  • Method and device for progressively recovering and circularly applying viscose fiber spinning acid waste liquid
  • Method and device for progressively recovering and circularly applying viscose fiber spinning acid waste liquid
  • Method and device for progressively recovering and circularly applying viscose fiber spinning acid waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Take 2000ml of spinning acid waste liquid from a viscose fiber company at a temperature of 80 degrees Celsius. After heat exchange with a heat exchanger, the temperature of the acidic waste liquid is reduced to 40 degrees Celsius, and the effluent after heat exchange is finely filtered device to remove solid insoluble matter in wastewater. The raw water index of spinning acid waste liquid is shown in Table 1-1.

[0060] Table 1-1 Raw water index data

[0061]

[0062] (2) 2000ml of effluent water passing through the precision filter enters the electrodialysis device, and 1000ml of pure water is used as the receiving solution in the electrodialysis device (the volume ratio of the electrodialysis water inlet volume to the receiving solution is 1:0.5), when the electrodialysis device The electrodialysis process is completed when the ratio of the salt content of the dialysis feedwater to the concentrated water is 1:1. In the electrodialysis process, 1200ml of fresh...

Embodiment 2

[0082] (1) Take 2000ml of spinning acid waste liquid from a viscose fiber company at a temperature of 85 degrees Celsius. After heat exchange with a heat exchanger, the temperature of the acidic waste liquid is reduced to 20 degrees Celsius, and the effluent after heat exchange is finely filtered device to remove solid insoluble matter in wastewater. Raw water index of spinning acid waste liquid is shown in Table 2-1.

[0083] Table 2-1 Raw water index data

[0084]

[0085] (2) 2000ml of effluent water through the precision filter enters the electrodialysis device, and 2000ml of pure water is used as the receiving solution in the electrodialysis device (the volume ratio of the electrodialysis water inlet volume to the receiving solution is 1:1), when the electrodialysis device The electrodialysis process is completed when the ratio of the salt content of the dialysis feedwater to the concentrated water is 1:2. In the electrodialysis process, 3000ml of fresh water and 100...

Embodiment 3

[0105] (1) Take 2000ml of spinning acid waste liquid from a viscose fiber company at a temperature of 90 degrees Celsius, heat exchange through a heat exchanger, reduce the temperature of the acid waste liquid to 10 degrees Celsius, and filter the effluent after heat exchange device to remove solid insoluble matter in wastewater. Raw water index of spinning acid waste liquid is shown in Table 3-1.

[0106] Table 3-1 Raw water index data

[0107]

[0108] (2) Enter 2000ml of the effluent water through the precision filter into the electrodialysis device, and use 4000ml of pure water as the receiving solution in the electrodialysis device (the volume ratio of the electrodialysis water inlet volume to the receiving solution is 1:2), when the electrodialysis device The electrodialysis process is completed when the ratio of the salt content of the dialysis feedwater to the concentrated water is 1:3. In the electrodialysis process, 5450ml of fresh water and 550ml of concentrate...

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Abstract

The invention discloses a method and a device for progressively recovering and circularly applying viscose fiber spinning acid waste liquid. The method comprises the following steps of (1), carrying out cooling and heat interchange on spinning acid waste liquid from a viscose fiber industry, and then removing a solid insoluble substance in the waste liquid by adopting a precision filter; (2), carrying out electrodialysis on the waste liquid treated in step (1), removing an organic substance in waste water, and carrying out evaporation concentration treatment on thick water subjected to the electrodialysis, so that a concentrated solution with a saline mass concentration of 30% to 50% is obtained; (3), recycling a sodium sulfate decahydrate crystal in the concentrated solution obtained in the step (2) by adopting a freezing crystallization way, and recycling freezing residual liquid in an acid bath device in a spinning production process; and (4), refining the sodium sulfate decahydratecrystal recycled in the step (3) to obtain anhydrous sodium sulfate. By using the method, the balancing of sodium sulfate in a system is realized; the resource utilization and the near zero emissionof viscose fiber spinning waste water are realized; and an organic substance is prevented from being enriched in the system.

Description

technical field [0001] The invention relates to a step-by-step resource recovery process for valuable elements in spinning wastewater in the viscose fiber industry, and belongs to the field of wastewater resource utilization. Background technique [0002] There are two main processes in the production of viscose fiber, one is the glue making process, and the other is the spinning process. The process of changing from viscose to regenerated cellulose filaments with certain quality is completed through an acidic coagulation acid bath. The coagulation components of viscose fiber mainly include sulfuric acid, sodium sulfate, and zinc sulfate. For some process purposes and to improve the physical and mechanical properties of the fiber, a small amount of aluminum-containing additives are often added to the coagulation bath. Therefore, this wastewater is a kind of strongly acidic and high-salt wastewater, which contains a large amount of sulfuric acid, sodium sulfate, zinc sulfate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F13/02D01F2/06
CPCD01F2/06D01F13/02Y02P70/62
Inventor 高亚娟汪林唐凯李丽芳黄如全吕振华张炜铭王利慧
Owner JIANGSU NJU ENVIRONMENTAL TECH
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