Salt recycling system for dyeing residual solutions

Abstract

The invention discloses a salt recycling system for dyeing residual solutions. The salt recycling system consists of an acid regulating system, a deoiling system, a back extraction system, a brine refining system and a salt regulating system; the acid regulating system, the deoiling system, the brine refining system and the salt regulating system are in fluid connection with one another in sequence through pipes; and the back extraction system is in fluid connection with the deoiling system through a pipe. In the salt recycling system, the deoiling system comprises an extraction tower, an airflotation machine, an oil-water separation device and a deoiling machine; the acid regulating system comprises a residual solution collecting device, a first-level regulating device, a second-level regulating device, an acid residual liquid storing device and an acid storing device; and the back extraction system comprises a color-carrying extractant collecting device, a back extraction mixing device, a net extractant collecting device, a back extraction agent storage device and a concentrated dye collecting device. The salt recycling system for dyeing residual solutions can be used to realizeclosed loop cycles of a water-salt system and an extractant system, so that pollution to external environment is reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a dyeing residue salt recycling system. Background technique [0002] Cotton is a textile material that is widely loved by the public. The most commonly used coloring of cotton textiles is reactive dyes. Because reactive dyes have a complete color spectrum, are easy to use, have good fastness and are low in price, reactive dyes are used in a large amount. The annual discharge of printing and dyeing wastewater in my country is 2 billion tons, of which about 400 million tons are reactive dyeing wastewater. In the actual dyeing process, reactive dyes can react with cotton to fix the dyes on the fiber (color fixation), and at the same time, the dyes will also react with water and become invalid (hydrolysis). About 70%, the higher the concentration of the dye used, the greater the hydrolysis ratio and the lower the relative fixation rate, so the color...

AI Technical Summary

Problems solved by technology

However, low affinity results in low dye uptake. In order to improve the use efficiency of reactive dyes, it is necessary to add 6-10% sodium sulfate to promote dyeing in the reactive dyeing process to increase the dye uptake. Some dark colors use as much as 1 ton of salt per ton of cotton, these salts are not lost during dyeing, and are directly discharged from the sewage after dyeing. Many factories discharge more than tens of tons of salt per day, causing serious harm to the surrounding soil and river ecology

Images