Alkali recovery device of jean mercerizing process weak alkali liquor

Abstract

The invention discloses an alkali recovery device of jean mercerizing process weak alkali liquor, includes a process weak alkali liquor tank (3), a weak alkali liquor transfer pump (4), a rotary filter (5), a floating separator (6), a sand filter (7), a flash evaporator (8), a stirring decloring device (9), a bag-type filter (10), a precision filter (12) and strong alkali liquor recovery tank (13) arranged in sequence. The invention is provided with characteristics of reasonable structure, compact device distribution, high steam-water ratio, small steam consmption; small impurity content in processed alkali solution, low chroma, and the recovered alkali can be used repeatly and directly; water used are all recycling used without discharge with safe environmental protection and high production efficiency.

Description

technical field [0001] The invention relates to an alkali recovery device for light lye in the mercerizing process of denim, which belongs to the wastewater recovery and treatment technology in the dyeing and finishing industry. Background technique [0002] The modern fabric mercerizing process, in addition to effectively improving the gloss of the fabric, must also achieve a number of indicators including the smallest width shrinkage, low residual shrinkage, good dimensional stability of the fabric, high uniform dyeing rate and good hand feeling. At the same time, it must meet the requirements of the energy-saving and emission-reduction index system such as reducing alkali consumption, reducing evaporation of light alkali recovery, and increasing the soda-water ratio of alkali concentration. [0003] According to preliminary statistics, there are 400-500 denim mercerizing machines in the country. Calculated on the basis of a daily production of 50,000 meters of mercerized...

AI Technical Summary

Problems solved by technology

[0005] But, at present to the processing method of described light lye, a kind of is to use exclusively for paper mills, and mercerized processing enterprises do not charge any fees, and what have even will post transportation costs; the other is to add acid to neutralize

This not only cannot be comprehensively utilized, "turning waste into treasure", but also the cost of acid neutralization is relatively high

According to preliminary statistics, 1g / L of weak lye needs 1.225g / L of concentrated sulfuric acid to neutralize. When the daily output of a mercerizing machine is 50,000 meters, the output of 45g / L of light lye is about 90t, which requires 5.6t of concentrated sulfuric acid. For neutralization, based on the market price of concentrated sulfuric acid of 400 yuan / t, about 2,250 yuan worth of sulfuric acid is used per day, which not only wastes a lot of money, but also produces more than 7 tons of salt (sodium sulfate), which is discharged into wastewater for biochemical treatment, increasing the cost of Difficulty and processing cost

Another kind is to adopt the Chinese patent ZL200710133372.1 expansion evaporator applied by the applicant to concentrate the light lye. Although it creates conditions for repeated reuse, in the lye evaporated through expansion, due to the presence of There are a lot of short fibers and dyes, so the reuse of the lye produced by it will have a direct negative impact on the quality of the denim mercerizing process

[0006] And the light lye of denim mercerizing process, the alkali recovery device that obtains the process light lye with direct repeated reuse value through treatment, has no report so far

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