Method for soda recovery and color removal after mercerization in dyeing and printing field and apparatus thereof

Abstract

The invention provides a mercerization alkali recovery and color removing method and the device in dyeing field. The invention is characterized in that the method comprises the following steps: (1) filtering, (2) evaporating, (3) color removing and (4) filtering. In the color removing step, hydrogen peroxide is sprayed into a container with alkali liquid through a jet pump, and at the same time, an aeration pipe is equipped to accelerate the reaction until the alkali liquid becomes clear without any color. The device comprises a plurality of filters, a plurality of evaporators, a container for accommodating the filtered and condensed alkali liquid, a jet pump for spraying the hydrogen peroxide into the container, an aeration pipe for accelerating the reaction and a filter for removing the impurity in the liquid. Each of the evaporator is provided with a fluid level gauge and a proportional valve controlled by the evaporator. After the mercerization alkali liquid is filtered by the filters and condensed by the evaporator, the alkali liquid is stored in the container. The outlet of the jet pump is communicated with the container. The aeration pipe is emerged into the alkali liquid. The outlet of the container is provided with the filter. After the alkali is transferred into the colorless and clear alkali liquid, the alkali can be directly reused, and therefore the source can be saved.

Description

technical field [0001] The invention provides a method and device for recovering and removing color alkali after mercerizing in the field of printing and dyeing, and belongs to the technical field of textile printing and dyeing. Background technique [0002] In the process of mercerizing in the printing and dyeing industry, a large amount of liquid caustic soda is consumed, and a large amount of spent caustic soda solution is also produced. Because these spent alkali solutions are colored, they have not been recycled, resulting in the consumption of a large amount of sulfuric acid in the subsequent sewage treatment process, which not only pollutes the environment but also leads to a waste of resources. Contents of the invention [0003] The object of the present invention is to provide a method and device for retrieving and removing color base after mercerizing in the printing and dyeing field, which solves the above problems, improves resource utilization, and reduces pol...

AI Technical Summary

Problems solved by technology

Because these spent alkali solutions are colored, they have not been recycled, resulting in the consumption of a large amount of sulfuric acid in the subsequent sewage treatment process, which not only pollutes the environment but also leads to a waste of resources

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