The wax, the main component of wax in batik printing, was separated, dehydrated and boiled in the batik printing wastewater treated by emulsification and sodium hydroxide (classification recovery), finally obtaining qualified recovery wax. In recent years, mechanical batik printing have been launched in the domestic textile base, access to a very good economic and social benefits, but the mechanical batik printing need a lot of rosin as a mechanical anti-stain agent, anti-dyeing and then be removed from the fabric The first step in the rosin removal process is to remove the rosin from the surface of the fabric first by mechanical means. This part of the returned rosin can be basically recycled. The second step is to saponify the rosin penetrating into the fabric with caustic soda to wash away Therefore, it is necessary to separate the rosin in the batik printing waste water from the first one to reduce the pollution, and second, to recycle the recovered rosin through reasonable processing so as to reduce the production cost. 1, batik printing wastewater recycling classification Batik printing need to go through multiple processes, and the process of different components of waste water, such as the batik printing waste water color is deep and shallow, different wax content, alkali content, must be classified recycling. Different shades of waste water should not be mixed; different wax content of waste water can not be mixed; different alkali content of waste water should not be mixed, but high alkali content of waste water and acid wastewater can be mixed. 1.1 bottoming machine wastewater The waste water from the bottoming machine is recycled to the gasification tank. The waxes are less waxy and dark in color. The wax can be separated first and then the waste water can be decolorized to finally reach the wastewater discharge standard. 1.2 cold caustic washing machine and caustic washing machine waste water [1] Alkali-washing is the reaction of alkali and rosin to form soluble sodium salt, which is then washed by water to achieve the purpose of de-waxing. The purpose of cold-alkali dyeing after dyeing is to remove the fine rosin powder produced after rosin rosin (rosin powder remains in wax pattern Which will seriously affect the effect of wax pattern, so they must be cleaned), but can not be alkaline cleaning treatment at high temperature, because the high temperature will make the surface of the rosin soften, affect the fineness of wax pattern, thus affecting the follow-up processing. , After the rosin soda wax must be washed with cold alkali.After the printing and dyeing, the wax is mechanically crushed by a dewaxing machine, but there are many wax powder on the surface, in order to remove the wax, heat (120 ℃) alkali caustic effect is better.Experiment shows that: after separation, the color of rosin is separated in the cold caustic washing machine and hot caustic washing machine waste water and the color is the same as the color of rosin in waste wax machine and dewaxing machine The resulting rosin is crisp, crisp hair due to cold caustic and hot caustic washing machine out of the wastewater containing wax more alkali is also high, so should be acidified and then decolorization treatment, the resulting recovery wax Light color, less trash, recycling of compliance. 1.3 Waxing machine and wax machine to waste water Waxing wax machine and to the waste water produced by recycling to the same flotation tank, these waxes contain the most wax, but without alkali, it can not and cold caustic washing machine, caustic washing machine waste water mixed together. Float in the pool decolorization treatment, the resulting recovered wax light color, with less miscellaneous, in line with the requirements of re-use. 2 Batik printing waste water and the separation of rosin 2.1 from the batik printing waste water recycling rosin principle [l] Rosin does not dissolve in water, but in the printing and dyeing process of adding various additives have emulsifying effect, help rosin soluble in water; sodium hydroxide and rosin role, so that part of the rosin into soluble sodium salt, rosin has a certain Water-soluble. Recovery, the water-soluble rosin to be separated by the acid treatment to make the soluble rosin sodium salt into water-insoluble rosin suspended solids, and then the use of flotation method to recover the liquid rosin Floats on the liquid surface, transfers to another sedimentation tank through the scraper bucket, after a certain time of deposition, watering, using the mechanical grab to separate the separated rosin from the sedimentation tank, and then carries on the subsequent processing. 2.2, flotation principle In a composite pipe, the middle of the water, the outer tube to send gas, a large number of bubbles in the recovery pool, the suspension of fine suspended rosin in the liquid surface, so as to achieve the separation of rosin and water. 2.3, dehydration Most of the water in the rosin isolated from the sedimentation tank is easily removed by unbound water, that is, mechanically dewatered, leaving the unbound water to leave the rosin at high speed with rotation, followed by a combination of moisture (difficult to separate and must be dried Dehydration, which is drying or drying on the basis of hot air drying or drying, and ultimately remove most of the water, the purpose is to reduce the brewing time and energy waste) The recovery rate of 94.5% of the general wax. 3, wax recovery process of brewing 3.1, boil the wax temperature Low temperature heating can remove excess water, the boiling point of water is 100 ℃, so the temperature control at about 100 ℃, after a certain period of heating can remove the remaining water - due to the recovery of wax water is not the same, so the heat to the water time Not the same general control of dehydration dehydration, dehydration as much as possible so that each batch of the same conditions, so heating dehydration time control, after the completion of heating dehydration start warming, but should pay attention to heating can not be too fast, otherwise it will affect the quality of recycled wax Slowly warming to about 160 ℃ f2 ~ C / min.) The quality of boiled wax is shown in Table 1. The wax pattern of the boiled wax at 160 ℃ is better, when the boil wax temperature is below 160 ℃, the wax is flexible Good, difficult to crack, but difficult to form wax pattern; if the temperature is too high, such as boil wax at 180 ℃, the wax is too brittle, in the fall cloth process easy to fall off from the fabric, wax pattern thick and short Poor wax pattern), easily lead to defects. 3.3, the quality of wax recovery requirements Recycled wax quality requirements: (1) color, requiring recovery of the wax color light .If the color is deep, re-use, the colored wax will stained white cloth, seriously affecting the cloth effect; (2) softness, the general recovery Wax is more brittle.Using recycled wax, often new, old wax according to a certain proportion with the use of this will not only solve the new wax cost is too high, the wax is relatively soft, difficult to produce wax pattern and other issues, but also solved the old Wax is more brittle, resulting in waxy streaks, easy to fall off and other issues caused by staining. [2] 4 Conclusion Rosin recovery technology can be more completely recycled, the use of sewage has been saponified rosin, which can effectively reduce production costs, more importantly, significantly reduce the COD in sewage. The value of CODo before the saponification rosin wastewater treatment reaches over 100 000 mg / L and only about 200 mg / L after the treatment, making a positive contribution to the clean production and circular economy of the enterprise.
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