In-situ Mineralization Dyeing Of Cotton Yarn And Treatment And Reuse Of Mineralized Residual Liquid

In this paper,in view of the serious discharge of high-salt sewage in the process of dyeing and post-treatment,the water resources and energy waste are huge.Based on the original in-situ mineralization dyeing technology of cotton fiber,the new in-situ mineralization dyeing technology process was optimized.The application effect of the new in-situ mineralization dyeing technology in the actual production of cotton yarn was explored,and the reuse of mineralized residual liquid was explored.Through this technology,the residual dyes and additives such as organic agents in the dyeing solution can be mineralized and decomposed to reduce the number of washings,and the purpose of water saving and energy saving can be achieved under the premise of ensuring various properties of the dyeing products.The mineralized residual liquid is simply purified and used for subsequent dyeing processing.The first part of this paper focuses on the process optimization of the new in-situ mineralization dyeing technology and the production and application effects of this new technology in the factory.Firstly,the effects of different alkaline agents on dyeing were investigated by studying the dyeing characteristic values in the dyeing stage.Secondly,optimized the optimum parameters of the amount of anhydrous sodium sulfate,the amount of alkali agent and the fixing time in the dyeing stage,and the optimum parameters of the pH of the mineralization stage,the amount of the coupling agent XBC and the amount of the coupling agent XYS are optimized.Finally,the new dyeing technology was tested in Jiangsu Eastdye Textile Co.,Ltd.to verify the production and application value of the technology.The results show that the best dyeing process:when the dye is 5%⁷%?owf?,the Anhydrous sodium sulfate is 90g/L,the fixing alkali agent XGB is 3.0%⁴.0%?owf?,the fixing time is 60min⁷0min;The best process for mineralization:the mineralization pH is 3.0,the coupling agent XBC is 1.3%?owf?,and the coupling agent XYS is 3.0%to 4.0%?owf?.The results of enterprise production and application show that compared with the traditional technology,this new technology can reduce dyeing water by 40.56%,steam consumption by30.24%,power consumption by 22.45%,and the COD_cr of dyeing wastewater by 69.36%.The BOD₅ is reduced by 78.12%,and the chroma is reduced by 49.56%,which meets the requirements of water-saving,energy-saving and emission-reducing clean production.The second part of this paper studies the treatment and reuse of in-situ mineralized residual liquid.Firstly,the relationship between the conductivity and the salt content in the salt solution was studied;Secondly,the dyeing effect of six commonly used reactive dyes was studied by using tap water and mineralized water as dyeing medium.The results showed that there was a significant linear positive correlation between conductivity and anhydrous sodium sulfate concentration in the concentration range of anhydrous sodium sulfate from5g/L to 90g/L.The mineralized residual liquid can be reused for subsequent dyeing after simple purification treatment,and the presence of trace organic components therein hardly affects the dyeing of the dye and the properties of the dyed yarn.The reuse of mineralized residual liquid not only saves water resources and energy,but also utilizes inorganic salts in the return water to achieve cost saving and environmental protection.Figure 21,table 47,reference 75.