Method for recycling mixed alkali liquor from after-treatment washing process of indigo
A washing process and alkali mixing technology, which is applied in the processing of textile materials, equipment configuration for processing textile materials, textiles and papermaking, etc., can solve the problems of high processing costs and production costs, waste of alkali resources, alkali loss, etc., to reduce tap water The use, huge benefits, and significant emission reduction effects
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[0015] The present invention will be further described below in conjunction with drawings and embodiments.
[0016] figure 1 As shown, a method for recovering mixed lye from the indigo post-treatment washing process, the flow process is: after the indigo oxidation process, it is sent to a filter press for pressure filtration, washed with tap water, and the filter press filtrate is concentrated through an alkali evaporation system and CO 2 After removing sodium to adjust the potassium-sodium ratio and dehydration, it is used as a solvent for alkali fusion in the oxidation process; the concentration of the washing liquid is 0.5%-5.0%, and the preferred concentration is 1.0%-4.0%. The washing liquid is sequentially desuspended, filtered and adsorbed organic matter After filtration, it is divided into two routes, one is returned to the filter press as washing water, and the other is cooled to 0-70°C, preferably 5-45°C, and returned to the indigo oxidation process for dilution of a...
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