Electrolytic reduction and recycling system for vat dye liquor

Abstract

The utility model provides a kind of based on vat dye's dye liquor electrolytic reduction and cyclic replenishment system, including storage tank, electrolytic unit, multiple matched conveying pump and multiple matched control valve.There are multiple storage tanks, each storage tank is equipped with liquid inlet pipe and liquid outlet pipe.The liquid inlet pipe of each storage tank is connected with the discharge port of batching tank, and the liquid inlet pipe of each storage tank is connected with the discharge port of dye tank.The liquid outlet pipe of each storage tank is connected with the feed port of dye tank.Electrolytic unit has feed end and discharge end, the liquid outlet pipe of each storage tank is connected with the feed end of electrolytic unit, and the liquid inlet pipe of each storage tank is connected with the discharge end of electrolytic unit.The utility model provides based on vat dye's dye liquor electrolytic reduction and cyclic replenishment system can shorten the time of bottom liquid in dye tank, to avoid the oxidation of bottom liquid due to exposure time too long, also can guarantee that the oxidized dye molecule in reflux dye liquor is reduced and utilized again, while the liquid level of dye tank can be avoided to rise.

Description

Technical Field

[0001] This utility model belongs to the technical field of dyeing process equipment, specifically relating to a dye liquor electrolytic reduction and circulation replenishment system based on vat dyes. Background Technology

[0002] Vat dyes achieve dyeing through a unique "reduction-oxidation" chemical process. Vat dyes themselves are insoluble in water and cannot be used directly for dyeing. Their dyeing process relies on a chemical reaction: in a strongly alkaline reducing agent solution, the dye molecules are reduced, becoming water-soluble leuco forms. These leuco forms have a strong affinity for cellulosic fibers (such as cotton and linen) and can be adsorbed onto the fibers. Then, in the air or under the action of other oxidizing agents, the leuco forms on the fibers are re-oxidized, restoring them to their original insoluble dye state and firmly fixed inside the fiber, as in denim.

[0003] In existing technologies, the dyeing process is usually carried out in a dye bath. Therefore, it is necessary to inject a base solution (the initial dye solution injected into the dye bath during the dyeing preparation stage) into the dye bath before dyeing. This involves a large volume of dye bath, much larger than the volume of the mixing tank. The initial preparation of a full tank of base solution requires multiple batches of mixing in the mixing tank, which is time-consuming. Moreover, the base solution prepared in previous batches has no storage space and needs to be introduced into the dye bath in advance. The base solution introduced into the dye bath in advance will undergo extensive oxidation due to the long waiting / retention time. During the dyeing stage, as the fabric is repeatedly immersed and oxidized by ventilation in the dye bath, dye molecules are continuously carried away, causing the concentration of the base solution in the dye bath to gradually decrease. In order to maintain the stability of dyeing depth and color, the dye bath must be replenished. However, as dyeing progresses, some dye molecules in the dye bath lose their dyeing ability due to oxidation. Over time, the number of ineffective dye molecules gradually increases and remains in the dye bath. Furthermore, during the replenishment process, the solution mixes with the low-concentration dye solution in the dyeing tank. The low-concentration dye solution does not leave the dyeing tank, causing the liquid level in the dyeing tank to rise continuously. After the level rises, some of the liquid needs to be manually drained, which is time-consuming and laborious. In addition, the drained liquid contains residual dye molecules, resulting in waste and increasing environmental pressure. It is not practical. Utility Model Content

[0004] This utility model provides a dye liquor electrolytic reduction and circulation replenishment system based on vat dyes, which aims to solve the problems of poor practicality in the existing dyeing process using vat dyes due to the preparation of full tank bottom liquid and the poor replenishment method.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a dye liquor electrolytic reduction and recycling system based on vat dyes, comprising: The storage tanks are provided in multiple locations, each of which is equipped with an inlet pipe and an outlet pipe; the inlet pipe of each storage tank is connected to the outlet of the mixing tank, and the inlet pipe of each storage tank is connected to the outlet of the dyeing tank; the outlet pipe of each storage tank is connected to the inlet of the dyeing tank. An electrolysis unit has a feed end and a discharge end. The feed end of the electrolysis unit is connected to the liquid outlet pipe of each of the storage tanks, and the discharge end of the electrolysis unit is connected to the liquid inlet pipe of each of the storage tanks. Multiple matching delivery pumps; Multiple matching control valves; Any one of the storage tanks can store replenishment liquid; Any one of the storage tanks can form a loop path with the electrolysis unit; Each of the established circulation paths can perform cyclic electrolytic reduction of the base liquid in each of the storage tanks during the staining preparation stage; Each of the formed circulation paths can electrolyze and reduce the replenishment solution in any of the tanks during the staining preparation stage; Each of the established circulation paths can perform cyclic electrolytic reduction of the low-concentration dye solution returned from the dye bath and the replenishment solution formed by newly added dye molecules in any of the storage tanks during the dyeing stage.

[0006] In one possible implementation, the electrolysis unit includes: An electrolytic cell has an electrolysis space; the electrolytic cell is provided with an inlet and an outlet.

[0007] In one possible implementation, multiple electrolytic cells are provided, and each electrolytic cell is connected in series. After the electrolytic cells are connected in series, the inlet and outlet at both ends form the feed end and discharge end of the electrolysis unit, respectively.

[0008] In one possible implementation, the dye liquor electrolytic reduction and recycling system based on vat dyes further includes: The matching controller is electrically connected to each of the aforementioned delivery pumps and each of the aforementioned control valves.

[0009] In one possible implementation, each of the storage tanks is provided with a stirring assembly; the stirring assembly is electrically connected to the controller, and the stirring assembly has a stirring section extending into the storage tank.

[0010] In one possible implementation, each of the storage tanks is equipped with a concentration monitor, which is electrically connected to the controller.

[0011] In one possible implementation, each of the tanks has a temperature control jacket on its outer wall.

[0012] In one possible implementation, each of the tanks is equipped with a pressure regulating valve at its top.

[0013] In one possible implementation, the outlet pipes of each of the storage tanks are connected to the inlet of the dyeing tank via a connecting pipe. The connecting pipeline includes: The circulation tank has an inlet and an outlet; The material transfer pipe connects the inlet of the circulation tank to the outlet pipe of each of the storage tanks, and connects the outlet of the circulation tank to the inlet of the dyeing tank.

[0014] The dye liquor electrolytic reduction and recycling system based on vat dyes provided in this implementation method, compared with existing technologies: During the dyeing preparation stage, the use of multiple storage tanks ensures a higher storage capacity of the base solution. Each tank can be sequentially connected to the electrolysis unit, forming an independent circulation path, allowing for the electrolytic reduction of the base solution in each tank in turn. Furthermore, once the base solution in each tank reaches the target concentration, it can be directly stored. Filling each tank completely before introducing it into the dyeing tank shortens the residence time of the base solution in the dyeing tank, thus preventing oxidation caused by prolonged exposure.

[0015] During the dyeing stage, each storage tank is connected to the outlet of the dye bath. This ensures that after the replenishing solution is added to the dye bath, the low-concentration dye solution in the dye bath can enter an empty storage tank. Through the circulation path formed by this storage tank and the electrolysis unit, the low-concentration reflux dye solution and newly added dye molecules in the storage tank are electrolytically reduced to form the replenishing solution. This replenishing solution can be used as a new replenishing solution after the previous storage tank containing replenishing solution is emptied. In this way, the oxidized dye molecules in the reflux dye solution can be reduced and reused, while avoiding the rise of the dye bath level as the replenishing solution enters, saving manpower and material costs, and demonstrating strong practicality. Attached Figure Description

[0016] Figure 1 Schematic diagram of the structure of the dye liquor electrolytic reduction and recycling system based on vat dyes provided in this embodiment of the present invention. Figure 1 ; Figure 2 Schematic diagram of the structure of the dye liquor electrolytic reduction and recycling system based on vat dyes provided in this embodiment of the present invention. Figure 2 (with a circulation groove); Figure 3 A schematic diagram of the storage tank structure of the dye liquor electrolytic reduction and circulation replenishment system based on vat dyes provided in an embodiment of this utility model; Figure 4This is a schematic diagram of a certain circulation path of the dye liquor electrolytic reduction and cyclic replenishment system based on vat dyes provided in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 10. Storage tank; 11. Inlet pipe; 12. Outlet pipe; 13. Stirring assembly; 14. Concentration monitor; 15. Temperature control jacket; 16. Pressure regulating valve; 20. Electrolysis unit; 21. Electrolytic cell; 30. Transfer pump; 40. Control valves; 50. Connecting pipeline; 51. Circulation tank; 52. Material transfer pipe; 60. Ingredient mixing tank; 70. Dyeing vat. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To facilitate understanding, it is necessary to explain the dyeing solutions at each stage. Before dyeing, i.e., in the dyeing preparation stage, an initial dyeing solution needs to be injected into the dye bath; this solution is the base solution. After dyeing begins, i.e., in the dyeing stage, the number of dye molecules in the dyeing solution or base solution in the dye bath gradually decreases, leading to a lower concentration. Therefore, a certain amount of replenishing solution needs to be prepared in advance during the dyeing preparation stage. The concentration of the replenishing solution is usually higher, several times that of the base solution.

[0020] Please see Figure 1 and Figure 4 The present invention provides a dye liquor electrolytic reduction and circulation replenishment system based on vat dyes. The system includes a storage tank 10, an electrolysis unit 20, multiple supporting delivery pumps 30, and multiple supporting control valves 40. Multiple storage tanks 10 are provided, each equipped with an inlet pipe 11 and an outlet pipe 12. The inlet pipe 11 of each storage tank 10 is connected to the outlet of a mixing tank 60, and also to the outlet of a dyeing tank 70. The outlet pipe 12 of each storage tank 10 is connected to the inlet of the dyeing tank 70. The electrolysis unit 20 has an inlet end and an outlet end. The inlet end of the electrolysis unit 20 is connected to the outlet pipe 12 of each storage tank 10, and the outlet end of the electrolysis unit 20 is connected to the inlet pipe 11 of each storage tank 10.

[0021] Specifically, any one of the storage tanks 10 can store replenishing liquid, covering the dyeing preparation stage or the dyeing stage, and the replenishing liquid can be injected into the dyeing tank 70 during the dyeing stage.

[0022] Specifically, any one of the storage tanks 10 can form a circulation path with the electrolysis unit 20, and this circulation path can reduce the dye solution in the storage tank 10.

[0023] Specifically, each of the formed circulation paths can perform cyclic electrolytic reduction of the bottom liquid in each storage tank 10 during the dyeing preparation stage.

[0024] Specifically, each of the formed circulation paths can electrolyze and reduce the replenishing solution in any one of the storage tanks 10 during the staining preparation stage.

[0025] Specifically, each of the formed circulation paths can perform cyclic electrolytic reduction of the low-concentration dye solution returned from the dyeing tank 70 and the replenishment solution formed by newly added dye molecules in any one of the storage tanks 10 during the dyeing stage.

[0026] The dye liquor electrolytic reduction and circulation replenishment system based on vat dyes provided in this embodiment, compared with the prior art, ensures increased storage capacity of the base liquor during the dyeing preparation stage by using multiple storage tanks 10. During the dyeing preparation stage, each storage tank 10 can be sequentially connected to the electrolysis unit 20 to form an independent circulation path, thereby sequentially electrolytically reducing the base liquor in each storage tank 10. Simultaneously, once the base liquor in each storage tank 10 reaches the target concentration, it can be directly stored. After each storage tank 10 is filled with base liquor, it is then introduced into the dyeing tank 70, shortening the residence time of the base liquor in the dyeing tank 70 and thus avoiding oxidation due to prolonged exposure. During the dyeing stage, each storage tank 10 is connected to the outlet of the dyeing tank 70. This ensures that after the replenishing solution is added to the dyeing tank 70, the low-concentration dye solution in the dyeing tank 70 can enter an empty storage tank 10. Through the circulation path formed by the storage tank 10 and the electrolysis unit 20, the low-concentration reflux dye solution and newly added dye molecules in the storage tank 10 are electrolytically reduced to form a replenishing solution. This replenishing solution can be used as a new replenishing solution after the previous storage tank 10 containing replenishing solution is emptied. In this way, the oxidized dye molecules in the reflux dye solution can be reduced and reused, while avoiding the rise of the dye solution level in the dyeing tank 70 as the replenishing solution enters, saving manpower and material costs, and demonstrating strong practicality.

[0027] It should be noted that there are two methods for preparing the replenishing solution during the dyeing preparation stage. The first method involves using a separate storage tank 10 to prepare the replenishing solution after the base solution is prepared but before it is injected into the dyeing tank 70. After the replenishing solution is prepared, the previously prepared base solution is then injected into the dyeing tank 70. The second method, when space is limited and the number of storage tanks 10 cannot be excessive, involves injecting all the base solution from each storage tank 10 into the dyeing tank 70, and then using a separate storage tank 10 to prepare the replenishing solution. Although the base solution will still be exposed in the dyeing tank 70 for a certain period in this process, the exposure time is significantly shortened compared to the traditional method.

[0028] In this embodiment, the inlet pipe 11 of the storage tank 10 can be located at the top of the storage tank 10, and the storage pipe can be located at the bottom of the storage tank 10.

[0029] In some embodiments, the electrolysis unit 20 may employ, for example... Figure 1 The structure shown. See also Figure 1 The electrolysis unit 20 includes an electrolytic cell 21, which has an electrolysis space. The electrolytic cell 21 is provided with an inlet and an outlet.

[0030] Inert electrodes, namely cathode and anode, are typically installed in the electrolytic cell 21. When direct current is applied, the cathode undergoes a reduction reaction, and the anode undergoes an oxidation reaction. The electrolyte in the area where the cathode is located is a dye solution, and the electrolyte in the area where the anode is located is an electrolyte solution.

[0031] After the storage tank 10 and the electrolytic cell 21 form a circulation path, dynamic electrolysis is formed. Driven by the delivery pump 30, the dye liquor can flow continuously, continuously transporting unreduced dye molecules to the cathode, ensuring reduction efficiency and reduction effect.

[0032] It should be noted that an ion exchange membrane can be installed in the electrolytic cell 21 to separate the cathode and anode regions, thus preventing the electrolytes on both sides from mixing.

[0033] In some embodiments, the electrolysis unit 20 may employ, for example... Figure 1 The structure shown. See also Figure 1 Multiple electrolytic cells 21 are provided, and each electrolytic cell 21 is connected in series. After the electrolytic cells 21 are connected in series, the inlet and outlet located at both ends form the feed end and discharge end of the electrolysis unit 20, respectively.

[0034] Multiple electrolytic cells 21 are connected in series, meaning the cathode regions of multiple electrolytic cells 21 are connected in series, with the inlet and outlet of each electrolytic cell 21 corresponding to a cathode region. This structure ensures that multiple cathodes are added to the formed circulation path, thereby further improving the reduction efficiency and ensuring the rapid preparation of the base solution or replenishment solution.

[0035] In some embodiments, see Figure 2 The dye liquor electrolytic reduction and circulation replenishment system based on vat dyes also includes a matching controller. The controller is electrically connected to each delivery pump 30 and each control valve 40.

[0036] The controller can control each delivery pump 30 and each delivery valve to ensure that each storage tank 10 can independently form a circulation path with the electrolysis unit 20, ensure that the raw materials containing dye molecules enter each storage tank 10 respectively, ensure that the dye liquid in the dyeing tank 70 enters each storage tank 10 respectively, and ensure that the bottom liquid or replenishment liquid in each storage tank 10 is injected into the dyeing tank 70.

[0037] The transfer pump 30 can be a screw transfer pump 30, and can also be equipped with a flow sensor.

[0038] Regarding control valve 40, it can be a solenoid valve.

[0039] In some embodiments, the storage tank 10 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 Each storage tank 10 is equipped with a stirring assembly 13. The stirring assembly 13 is electrically connected to the controller and has a stirring part that extends into the storage tank 10.

[0040] Regarding the preparation of the base liquid and the replenishing liquid, the stirring assembly 13 can ensure the mixing effect of the base liquid or the replenishing liquid in the storage tank 10. The stirring assembly 13 is existing technology and is quite conventional in the use of the storage tank 10. It is a standard setting for those skilled in the art and will not be described in detail here.

[0041] In some embodiments, the storage tank 10 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 Each storage tank 10 is equipped with a concentration monitor 14, which is electrically connected to the controller.

[0042] The concentration monitor 14 can ensure real-time monitoring of the concentration of the supplementary solution or the base solution, thereby controlling the concentration of the base solution and the supplementary solution and facilitating the staining effect.

[0043] In some embodiments, the storage tank 10 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 Each of the storage tanks 10 is provided with a temperature control jacket 15 on its outer wall. The temperature control jacket 15 can ensure that the base liquid or replenishment liquid in the storage tank 10 is maintained at a temperature that is convenient for dyeing, thereby ensuring the subsequent dyeing effect.

[0044] Regarding the temperature control jacket 15, it can be electrically controlled, and when it is electrically controlled, it is electrically connected to the controller.

[0045] In some embodiments, the storage tank 10 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 Each of the storage tanks 10 is equipped with a pressure regulating valve 16 at its top.

[0046] The process of introducing low-concentration dye liquor into an empty storage tank 10, or injecting base liquid into storage tank 10 during the dyeing preparation stage, or injecting base liquid or replenishing liquid from storage tank 10 into dyeing tank 70, all involve changes in air pressure inside storage tank {10}. The air pressure regulating valve 16 can balance the air pressure inside and outside storage tank 10 to ensure the smooth entry and exit of materials.

[0047] In some embodiments, see Figure 2 Each storage tank 10's outlet pipe 12 is connected to the inlet of the dyeing tank 70 via a connecting pipe 50. The connecting pipe 50 includes a circulation tank 51 and a transfer pipe 52. The circulation tank 51 has an inlet and an outlet. The transfer pipe 52 connects the inlet of the circulation tank 51 to the outlet pipe 12 of each storage tank 10, and connects the outlet of the circulation tank 51 to the inlet of the dyeing tank 70.

[0048] The circulation tank 51 provides a buffer space for the exported replenishment solution, ensuring that the replenishment solution enters the dyeing tank 70 smoothly, which facilitates the dyeing effect.

[0049] As a specific embodiment of the dye liquor electrolytic reduction and recycling system based on vat dyes provided by this utility model, please refer to... Figure 1 : There are four storage tanks 10, designated as Tank No. 1, Tank No. 2, Tank No. 3, and Tank No. 4, with each tank 10 having a usable volume corresponding to 4 tons of material; the dyeing tank 70 has a capacity of 16 tons to hold the bottom liquid. Additionally, a mixing tank 60 is provided, which can pre-mix the raw materials containing dye molecules.

[0050] During the dyeing preparation stage, raw materials are sequentially introduced into four storage tanks 10 via the mixing tank 60. When the raw material in tank 1 reaches 4 tons, under the control of the controller, tank 1 forms a circulation path with each electrolytic cell 21 to prepare the base solution. After the base solution in tank 1 is prepared, it is stored in tank 1. Simultaneously, tank 2 forms a circulation path with each electrolytic cell 21 to prepare the base solution, until the base solutions in tanks 3 and 4 are prepared. At this point, the base solutions in tanks 1, 2, 3, and 4 can be discharged into the dyeing tank 70 via the transfer pump 30. Subsequently, raw materials are introduced into tank 1 via the mixing tank 60. When the raw material reaches 4 tons, under the control of the controller, tank 1 forms a circulation path with each electrolytic cell 21 to prepare the replenishing solution, which is then stored in tank 1 after preparation.

[0051] During the dyeing stage, as dyeing progresses, the replenishing solution in tank 1 is connected to dyeing tank 70, and the replenishing solution in tank 1 is gradually injected into dyeing tank 70. Simultaneously, the inlet pipe 11 of tank 2 is connected to the outlet of dyeing tank 70, and the low-concentration dye solution in dyeing tank 70 is introduced into tank 2 under the action of pump 30. This creates a circulation path between tank 2 and each electrolytic cell 21. The low-concentration dye solution entering tank 2 mixes with the raw materials introduced from mixing tank 60, circulating and undergoing reduction again in the circulation path to form new replenishing solution. When the replenishing solution in tank 1 is completely used, the connection between tank 2 and dyeing tank 70 is opened, allowing the replenishing solution in tank 2 to replenish dyeing tank 70. At the same time, the inlet pipe 11 of tank 3 is connected to the outlet of dyeing tank 70, allowing the low-concentration dye solution to be introduced into tank 3, and the above process is repeated, with the replenishing solution being prepared in tank 3.

[0052] Preferably, after the first tank is replenished, the corresponding circulation path of the second tank is designed to restore the replenished solution, which is then stored in the second tank. After the second tank is replenished, the corresponding circulation path of the third tank is designed to replace the replenished solution, which is then stored in the third tank.

[0053] It should also be noted that the addition of raw materials will cause the dye liquor level in dyeing tank 70 to rise, but the rise will be relatively slow. After prolonged use, if the dye liquor level rises, the excess dye liquor can be transferred to tank number four for storage and use in the next dyeing cycle; or it can be directly transferred to mixing tank 60 for reuse.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for electrolytic reduction and cyclic replenishment of a vat dye liquor based on a vat dye, characterized in that, include: The storage tanks are provided in multiple locations, each of which is equipped with an inlet pipe and an outlet pipe; the inlet pipe of each storage tank is connected to the outlet of the mixing tank, and the inlet pipe of each storage tank is connected to the outlet of the dyeing tank; the outlet pipe of each storage tank is connected to the inlet of the dyeing tank. An electrolysis unit has a feed end and a discharge end. The feed end of the electrolysis unit is connected to the liquid outlet pipe of each of the storage tanks, and the discharge end of the electrolysis unit is connected to the liquid inlet pipe of each of the storage tanks. Multiple matching delivery pumps; Multiple matching control valves; Any one of the storage tanks can store replenishment liquid; Each of the storage tanks can form a circulation path with the electrolysis unit; each circulation path is used to perform cyclic electrolytic reduction of the base liquid in each of the storage tanks during the dyeing preparation stage, or to perform cyclic electrolytic reduction of the replenishment liquid in any of the storage tanks, or to perform cyclic electrolytic reduction of the low-concentration dye solution returned from the dye bath and the replenishment liquid formed by newly added dye molecules in any of the storage tanks during the dyeing stage.

2. The vat dye-based dyebath electrolytic reduction and cyclic replenishment system according to claim 1, characterized in that, The electrolysis unit includes: An electrolytic cell has an electrolysis space; the electrolytic cell is provided with an inlet and an outlet.

3. The vat dye-based dyebath electrolytic reduction and cyclic replenishment system according to claim 2, characterized in that, The electrolytic cells are provided in multiple ways, and each electrolytic cell is connected in series. After the electrolytic cells are connected in series, the inlet and outlet at both ends form the feed end and discharge end of the electrolytic unit, respectively.

4. The dye liquor electrolytic reduction and recycling system based on vat dyes as described in any one of claims 1-3, characterized in that, The dye liquor electrolytic reduction and recycling system based on vat dyes also includes: The matching controller is electrically connected to each of the aforementioned delivery pumps and each of the aforementioned control valves.

5. The dye liquor electrolytic reduction and recycling system based on vat dyes as described in claim 4, characterized in that, Each of the storage tanks is equipped with a stirring assembly; the stirring assembly is electrically connected to the controller, and the stirring assembly has a stirring part that extends into the storage tank.

6. The dye liquor electrolytic reduction and recycling system based on vat dyes as described in claim 4, characterized in that, Each of the storage tanks is equipped with a concentration monitor, which is electrically connected to the controller.

7. The dye liquor electrolytic reduction and recycling system based on vat dyes as described in claim 4, characterized in that, Each of the aforementioned storage tanks is equipped with a temperature control jacket on its outer wall.

8. The dye liquor electrolytic reduction and recycling system based on vat dyes as described in claim 4, characterized in that, Each of the aforementioned storage tanks is equipped with a pressure regulating valve at its top.

9. The dye liquor electrolytic reduction and recycling system based on vat dyes as described in claim 1, characterized in that, The liquid outlet pipes of each of the aforementioned storage tanks are connected to the feed inlet of the dyeing tank via connecting pipes; The connecting pipeline includes: The circulation tank has an inlet and an outlet; The material transfer pipe connects the inlet of the circulation tank to the outlet pipe of each of the storage tanks, and connects the outlet of the circulation tank to the inlet of the dyeing tank.

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