Decoloring method and recycling method for spinning finishing colored waste alkali

A recycling method and non-ferrous technology, applied in textile industry wastewater treatment, chemical instruments and methods, filtration treatment, etc., can solve the problems of sewage treatment plants not running normally, decolorization confusion, lye reuse, and reducing sewage treatment efficiency, etc.

Inactive Publication Date: 2017-11-10
韶关市北纺智造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A large amount of acid should be added to neutralize the waste alkali before entering the sewage treatment, otherwise the efficiency of sewage treatment will be greatly reduced, and the discharge of a large amount of waste alkali will even cause the sewage treatment plant to fail to operate normally
At present, the recovery technology of light alkali is mature and has been applied to some printing and dyeing enterprises. However, for denim production enterprises, because there is a certain amount of indigo and sulfide in the waste alkali, even if the recovery of light alkali is completed, it cannot be reused. Therefore The problem of decolorization puzzles the reuse of lye in denim production enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The post-finishing mercerizing machine uses 30 tons of commercial alkali with a concentration of 32% to mercerize the denim surface every day, and the alkali recovery system collects 60 tons of colored waste alkali for textile finishing with a concentration of 3% produced by the mercerizing machine every day.

[0040] The Baume degree of colored waste alkali for textile finishing is 4°Bé, the chromaticity is 600, the pH value is 13.61, the content of pulp dye is 0.08%, the content of suspended solids is 1320mg / L, of which, the content of particulate matter is 30%, and the content of fluff is 60% %.

[0041] Decolorization treatment steps:

[0042] (1) Precipitate and purify the colored waste caustic soda in textile finishing to remove some particles; then perform primary filtration through a tumbler filter to obtain a primary filtrate;

[0043] (2) the primary filtrate obtained in the step (1) is carried out to primary air flotation, the volume ratio of dissolved air w...

Embodiment 2

[0047] The decolorized spent caustic soda obtained in Example 1 was steam-heated, evaporated and concentrated at a temperature of 170° C. at a rate of 5 t / h to obtain concentrated lye and hot water.

[0048] The Baume degree of the concentrated spent caustic soda is 17°Bé, the chroma is 400, the pH value is 13.93, the content of slurry dye is 0.01%, the content of suspended matter is 444mg / L, among which, the content of particulate matter is 38%, and the content of fluff is 51%. .

[0049] Every day, 60 tons of textile finishing colored waste alkali with a concentration of 3% is concentrated into 17 tons of recycled alkali with a concentration of 11.8%. The recovered alkali is converted into commercial alkali with a concentration of 32% and there are 6.3t, and the recycling rate of the system is 21%. At the same time, there are 71.6 t 70°C hot water is returned to production use.

Embodiment 3

[0051] The Baume degree of colored waste alkali for textile finishing is 4°Bé, the chroma is 590, the pH value is 13.5, the dye content of pulp is 0.076%, the suspended solid content is 1298mg / L, among which, the particle content is 29%, and the fluff content is 60% %.

[0052] The decolorization treatment was carried out according to the method in Example 1 to obtain the decolorized spent caustic soda. The difference was that the volume ratio of dissolved air water to filtrate in the primary air flotation and secondary air flotation was 1:80, and the gas volume content of dissolved air water was 10%.

[0053] The Baume degree of the decolorized waste caustic soda is 4°Bé, the chroma is 49, the pH value is 13.6, the content of pulp dye is 0.0012%, the content of suspended matter is 31mg / L, and the content of particulate matter is 28%, and the content of fluff is 62%. .

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Abstract

The invention provides a decolorization method and a recovery method of colored waste caustic soda in textile finishing. The present invention sequentially performs primary filtration, air flotation treatment, and ultrafiltration membrane decolorization on the colored waste caustic soda after textile finishing, and successively removes particulate matter, colored suspended matter such as larger fluff and fine fluff, and residual pulp dyes in the colored waste caustic soda after textile finishing, effectively Reduced the chromaticity of waste lye. In the present invention, the decolorized spent caustic soda obtained by the above decolorized method is evaporated and concentrated, and the obtained concentrated lye has low chroma, which can be directly reused for textile finishing; the obtained hot water can also be directly used in the production steps. Experimental results show that after textile finishing colored waste caustic soda is treated by the decolorization method and recovery method provided by the present invention, the content of suspended solids is reduced from 1320 mg / L to 444 mg / L, the chromaticity is reduced from 600 to 400, and the Baume degree is increased by 4°Bé To 17 ~ 25 ° Bé, can be directly used for textile finishing.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a decolorization method and recovery method of colored waste caustic soda in textile finishing. Background technique [0002] In order to ensure the dimensional stability of denim, improve the fabric feel and the needs of clothing functionality, under normal circumstances, denim must be finished. The main process includes: singeing, desizing, mercerizing, skewing, weft adjustment, shrinkage . Among them, mercerizing is an important fabric finishing method. After mercerizing, the fabric feels soft and has a certain luster, and the impurities on the cloth surface are effectively reduced. It is also widely used in the finishing process of denim products. [0003] Mercerizing means that the fabric passes through two alkali tanks, in which the concentrated alkali of 20-25 degrees Baume (°Bé) is continuously replenished, and the fabric rolled with lye is fully reacted b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/10C02F103/30
CPCC02F9/00C02F1/001C02F1/048C02F1/24C02F1/444C02F2001/007C02F2103/30C02F2301/08
Inventor 陈桂春
Owner 韶关市北纺智造科技有限公司
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