Device for regenerating and recycling construction waste micro powder through electrochemical method and working method of device

Abstract

The invention discloses an electrochemical construction waste micro powder regeneration and recovery device and a working method thereof, the device comprises an electrolytic reaction box, a separation membrane is arranged in the electrolytic reaction box to divide an anode reaction zone and a cathode reaction zone, an anode liquid outlet is formed in the anode reaction zone, and a cathode liquid outlet is formed in the cathode reaction zone; the electrolysis assembly comprises an anode electrode and a cathode electrode, the anode electrode is arranged in the anode reaction zone, and the cathode electrode is arranged in the cathode reaction zone; the acid liquor tank is connected with the anode liquor outlet; the alkali liquor pool is connected with the cathode liquor outlet and the acid liquor pool; and the precipitation reaction tank is connected with the acid liquor tank and the alkali liquor tank. According to the device, the electrolyte is electrolyzed in the electrolytic reaction box to obtain an acidic solution and an alkaline solution, and calcium components and silicon-aluminum components in the regenerated micro-powder are reacted respectively, so that calcium elements, silicon elements and aluminum elements in the regenerated micro-powder are fully recycled.

Description

Technical Field

[0001] The invention relates to the field of electrochemical technology, and in particular to an electrochemical construction waste powder regeneration and recovery device and a working method thereof. Background Art

[0002] The demolition and renovation of buildings, as well as the construction and decoration projects of new buildings, will generate a large amount of construction waste, among which waste concrete accounts for more than 50% of the total construction waste. At present, the recycled coarse aggregate obtained by crushing and screening waste concrete has been applied on a large scale. At the same time, the crushing process produces a large amount of recycled sand powder (fine powder <4.75mm), which accounts for 35-45% of the total mass of waste concrete, mainly composed of hardened cement paste (hydration products, unhydrated clinker particles and auxiliary cementitious materials, etc.), quartz and limestone (derived from crushed aggregates). The existing high value-added methods of utilizing recycled sand powder mainly include using it as a substitute raw material for cement and as an auxiliary cementitious material. However, since the volume proportion of limestone and quartz in the recycled sand powder is relatively high, if the powder is further ground and refined, the limestone, quartz and hardened slurry are ground together, and the hardened slurry content in the recycled micropowder is only 30-40%. Although the latter can reduce carbon emissions and energy consumption during cement burning, quartz will lead to a decrease in burnability, and limestone will still release carbon dioxide during the burning process. At the same time, since there are fewer unhydrated phases in the recycled micropowder and the activity is low, the application as an auxiliary cementitious material will lead to a decrease in the mechanical properties and durability of cement-based materials. At present, high-concentration alkali is generally used to promote the breakage of Si-O and Al-O bonds in the glass body of the recycled micropowder, thereby improving the hydration activity of the recycled micropowder, but the alkali has no obvious activation effect on low-activity calcium components (such as limestone, CSH, etc.).

[0003] In summary, the existing high value-added utilization methods of recycled micropowders are inefficient, energy-intensive, and require a large amount of high-purity chemicals, making them unsuitable for large-scale disposal. The fundamental reason is that the calcium component and the silicon-aluminum component in the recycled micropowder cannot be effectively separated and utilized separately. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an electrochemical construction waste micro-powder regeneration and recovery device, which can separate the calcium component and the silicon-aluminum component in the regenerated micro-powder and react them separately, thereby improving the recovery rate of the regenerated micro-powder.

[0005] The present invention also proposes a working method of the electrochemical construction waste micro-powder regeneration and recovery device.

[0006] The electrochemical construction waste powder regeneration and recovery device according to the first embodiment of the present invention comprises:

[0007] An electrolytic reaction box, which is used to load electrolyte, wherein a separator is provided in the electrolytic reaction box to divide the electrolytic reaction box into an anode reaction zone and a cathode reaction zone, wherein an anode liquid outlet is provided in the anode reaction zone, and a cathode liquid outlet is provided in the cathode reaction zone;

[0008] An electrolytic assembly, comprising an anode electrode and a cathode electrode, wherein the anode electrode is disposed in the anode reaction zone, and the cathode electrode is disposed in the cathode reaction zone;

[0009] An acid liquid tank connected to the anode liquid outlet, the acid liquid tank being provided with a liquid outlet and a slag outlet;

[0010] An alkali liquid pool, which is connected to the cathode liquid outlet and the slag outlet of the acid liquid pool, and the alkali liquid pool is provided with a liquid outlet;

[0011] The precipitation reaction tank is connected with the liquid outlet of the acid liquid tank and the liquid outlet of the alkali liquid tank.

[0012] The electrochemical construction waste powder regeneration and recovery device according to the embodiment of the present invention has at least the following beneficial effects: the electrolyte is electrolyzed in the electrolysis reaction box to obtain an acidic solution and an alkaline solution, and the calcium component and the silicon-aluminum component in the regenerated powder are reacted respectively, so as to fully recover the calcium, silicon and aluminum elements therein.

[0013] According to some embodiments of the present invention, the separation membrane is specifically a porous PTEF membrane.

[0014] According to some embodiments of the present invention, the surfaces of the anode electrode and the cathode electrode are both plated with a titanium mesh of PbO2.

[0015] According to some embodiments of the present invention, the electrolytic assembly further comprises a DC power supply, wherein a positive electrode of the DC power supply is electrically connected to the anode electrode, and a negative electrode of the DC power supply is electrically connected to the cathode electrode.

[0016] According to some embodiments of the present invention, the electrolysis reaction box is a closed box, which is convenient for collecting oxygen and hydrogen generated during the electrolysis process.

[0017] According to some embodiments of the present invention, the electrochemical method for regenerating and recovering construction waste powder also includes an oxygen storage tank and a hydrogen storage tank. The oxygen storage tank is connected to the anode reaction zone of the electrolysis reaction box to collect oxygen, and the hydrogen storage tank is connected to the cathode reaction zone of the electrolysis reaction box to collect hydrogen.

[0018] According to some embodiments of the present invention, the electrolysis reaction box is provided with a liquid inlet, and the liquid inlet of the electrolysis reaction box is connected to the precipitation reaction tank. The upper clear liquid in the precipitation reaction tank can flow back to the electrolysis reaction box from the liquid inlet of the electrolysis reaction box, thereby recycling the reaction liquid.

[0019] According to some embodiments of the present invention, the electrochemical construction waste powder regeneration and recovery device also includes a drying box, which is connected to the slag outlet of the precipitation reaction tank and is used to dry the solid matter obtained by the reaction.

[0020] The working method according to the second aspect of the present invention is based on the above-mentioned electrochemical construction waste powder regeneration and recovery device, and includes the following steps:

[0021] injecting electrolyte into the electrolysis reaction box;

[0022] Connecting the anode electrode and the cathode electrode to a direct current power supply and starting the direct current power supply, the pH value of the electrolyte in the anode reaction zone gradually decreases, and the pH value of the electrolyte in the cathode reaction zone gradually increases;

[0023] Leading the electrolyte in the anode reaction zone to the acid solution pool, and leading the electrolyte in the cathode reaction zone to the alkali solution pool;

[0024] Adding regenerated micro powder into the acid solution pool and performing stirring and dissolving, static precipitation and solid-liquid separation to obtain an acid solution and a colloidal solid;

[0025] The colloidal solid in the acid solution pool is discharged to the alkaline solution pool through a slag outlet for secondary dissolution reaction, and static precipitation and solid-liquid separation are performed to obtain an alkaline solution;

[0026] The acid solution in the acid liquid pool is discharged to the precipitation reaction pool through the liquid outlet of the acid liquid pool, and the alkali solution in the alkali liquid pool is discharged to the precipitation reaction pool through the liquid outlet of the alkali liquid pool;

[0027] The acid solution and the alkaline solution are mixed and reacted in the precipitation reaction tank, and solid-liquid separation is performed after aging for 24 hours;

[0028] The solid matter obtained from the precipitation reaction tank is dried to obtain reusable regenerated particles.

[0029] According to some embodiments of the present invention, when the pH value of the electrolyte in the anode reaction zone reaches 1, it is discharged into the acid solution pool, and when the pH value of the electrolyte in the cathode reaction zone reaches 13, it is discharged into the alkaline solution pool.

[0030] According to the working method of the embodiment of the present invention, at least the following beneficial effects are achieved: after the electrolyte is electrolyzed by the electrolysis reaction box, the acidic solution and the alkaline solution therein enter the acid solution pool and the alkaline solution pool respectively, and the solution after the filter residue is precipitated is mixed and reacted in the precipitation reaction tank to obtain recyclable regenerated particles, thereby reducing the impact on the environment.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 This is a connection diagram of an electrochemical construction waste powder regeneration and recovery device according to an embodiment of the first aspect of the present invention.

[0034] Figure numerals: 100 - electrolytic reaction box, 110 - separation membrane, 120 - anode reaction zone, 121 - anode liquid outlet, 130 - cathode reaction zone, 131 - cathode liquid outlet, 200 - electrolytic component, 210 - anode electrode, 220 - cathode electrode, 230 - direct current power supply, 300 - acid solution tank, 400 - alkaline solution tank, 500 - precipitation reaction tank, 600 - drying box. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] The demolition and renovation of buildings, as well as the construction and decoration projects of new buildings, will generate a large amount of construction waste, among which waste concrete accounts for more than 50% of the total construction waste. At present, the recycled coarse aggregate obtained by crushing and screening waste concrete has been applied on a large scale. At the same time, the crushing process produces a large amount of recycled sand powder (fine powder <4.75mm), which accounts for 35-45% of the total mass of waste concrete, mainly composed of hardened cement paste (hydration products, unhydrated clinker particles and auxiliary cementitious materials, etc.), quartz and limestone (derived from crushed aggregates). The existing high value-added methods of utilizing recycled sand powder mainly include using it as a substitute raw material for cement and as an auxiliary cementitious material. However, since the volume proportion of limestone and quartz in the recycled sand powder is relatively high, if the powder is further ground and refined, the limestone, quartz and hardened slurry are ground together, and the hardened slurry content in the recycled micropowder is only 30-40%. Although the latter can reduce carbon emissions and energy consumption during cement burning, quartz will lead to a decrease in burnability, and limestone will still release carbon dioxide during the burning process. At the same time, since there are fewer unhydrated phases in the recycled micropowder and the activity is low, the application as an auxiliary cementitious material will lead to a decrease in the mechanical properties and durability of cement-based materials. At present, high-concentration alkali is generally used to promote the breakage of Si-O and Al-O bonds in the glass body of the recycled micropowder, thereby improving the hydration activity of the recycled micropowder, but the alkali has no obvious activation effect on low-activity calcium components (such as limestone, CSH, etc.).

[0041] In summary, the existing high value-added utilization methods of recycled micropowders are inefficient, energy-intensive, and require a large amount of high-purity chemicals, making them unsuitable for large-scale disposal. The fundamental reason is that the calcium component and the silicon-aluminum component in the recycled micropowder cannot be effectively separated and utilized separately.

[0042] In this regard, the present application proposes an electrochemical method for the regeneration and recovery of construction waste powder, which electrolyzes the electrolyte in an electrolytic reaction box 100 to obtain an acidic solution and an alkaline solution, and reacts the calcium component and the silicon-aluminum component in the regenerated powder respectively, thereby fully recovering the calcium, silicon and aluminum elements therein.

[0043] In addition, the present application also proposes a working method for the above-mentioned electrochemical construction waste powder regeneration and recovery device. After the electrolyte is electrolyzed by the electrolysis reaction box 100, the acidic solution and the alkaline solution therein enter the acid solution pool 300 and the alkaline solution pool 400 respectively. The solution after the sedimentation of the filter residue is mixed and reacted in the sedimentation reaction tank 500 to obtain recyclable regenerated particles, thereby reducing the impact on the environment.

[0044] Reference Figure 1 The electrochemical method construction waste powder regeneration and recovery device in the first embodiment of the present application includes an electrolytic reaction box 100, an electrolytic component 200, an acid tank 300, an alkaline tank 400 and a precipitation reaction tank 500. Among them, the electrolytic reaction box 100 provides an environment for electrolyte electrolysis, and the electrolytic component 200 is used to output electrical energy to complete the electrolysis work. The acid tank 300 is used to receive the acidic electrolyte flowing out of the electrolytic reaction box 100, and dissolve the calcium components in the regenerated powder. The alkaline tank 400 is used to receive the alkaline electrolyte flowing out of the electrolytic reaction box 100, and dissolve the silicon and aluminum components in the regenerated powder. The precipitation reaction tank 500 is used to mix the reaction solutions of the acid tank 300 and the alkaline tank 400, react and dry the solid substances therein to obtain CSH regeneration particles for subsequent recycling.

[0045] Specifically, the electrolytic reaction box 100 is used to load the electrolyte, and a separator 110 is provided in the electrolytic reaction box 100 to divide the electrolytic reaction box 100 into an anode reaction area 120 and a cathode reaction area 130. The electrolytic reaction box 100 is provided with an anode liquid outlet 121 in the anode reaction area 120, and the electrolytic reaction box 100 is provided with a cathode liquid outlet 131 in the cathode reaction area 130.

[0046] The electrolytic assembly 200 includes an anode electrode 210 and a cathode electrode 220 . The anode electrode 210 is disposed in the anode reaction zone 120 , and the cathode electrode 220 is disposed in the cathode reaction zone 130 .

[0047] The acid liquid pool 300 is connected to the anode liquid outlet 121, and is used to receive the acid electrolyte flowing out from the anode reaction area 120. The acid liquid pool 300 is provided with a liquid outlet and a slag outlet, so that the upper clear liquid after sedimentation treatment in the acid liquid pool 300 can flow out from the liquid outlet, and the lower sediment can flow out from the slag outlet.

[0048] The alkali liquid pool 400 is connected to the cathode liquid outlet 131 and the slag outlet of the acid liquid pool 300, and is used to receive the alkaline electrolyte flowing out of the cathode reaction zone 130 and the solid precipitate flowing out of the acid liquid pool 300. The alkali liquid pool 400 is provided with a liquid outlet, so that the supernatant liquid after the reaction and sedimentation treatment in the alkali liquid pool 400 can flow out from the liquid outlet.

[0049] The precipitation reaction tank 500 is connected to the liquid outlet of the acid tank 300 and the liquid outlet of the alkali tank 400, and is used to receive the acid solution in the acid tank 300 and the alkaline solution in the alkali tank 400. The two undergo a neutralization reaction in the precipitation reaction tank 500, and the solid matter obtained can be subsequently dried to obtain regenerated particles containing CSH.

[0050] Specifically, the separator 110 is a porous PTEF membrane, which functions to prevent the neutralization of hydroxide ions and hydrogen ions, maintain the local acid-base environment in the electrolysis reaction box 100, and transmit water and electrolyte ions to promote the electrolysis reaction.

[0051] Furthermore, the surfaces of the anode electrode 210 and the cathode electrode 220 are both plated with a titanium mesh of PbO2.

[0052] Furthermore, the electrolytic assembly 200 further includes a DC power supply 230 , a positive electrode of the DC power supply 230 is electrically connected to the anode electrode 210 , and a negative electrode of the DC power supply 230 is electrically connected to the cathode electrode 220 .

[0053] Optionally, the electrolytic reaction box 100 is a closed box, which is convenient for collecting oxygen and hydrogen generated during the electrolysis process. The electrochemical construction waste powder regeneration and recovery device also includes an oxygen storage tank and a hydrogen storage tank, the oxygen storage tank is connected to the anode reaction area 120 of the electrolytic reaction box 100 to collect oxygen, and the hydrogen storage tank is connected to the cathode reaction area 130 of the electrolytic reaction box 100 to collect hydrogen.

[0054] Furthermore, the electrolytic reaction box 100 is provided with a liquid inlet, which is connected to the precipitation reaction tank 500. The supernatant in the precipitation reaction tank 500 can flow back to the electrolytic reaction box 100 from the liquid inlet of the electrolytic reaction box 100, thereby recycling the reaction liquid.

[0055] Furthermore, the electrochemical construction waste powder regeneration and recovery device also includes a drying box 600, which is connected to the slag outlet of the precipitation reaction tank 500 and is used to dry the solid matter obtained by the reaction.

[0056] A working method for the electrochemical construction waste powder regeneration and recovery device in the second embodiment of the present application comprises the following steps:

[0057] S100. Injecting electrolyte into the electrolytic reaction box 100;

[0058] S200. The anode electrode 210 and the cathode electrode 220 are connected to the DC power supply 230 and the DC power supply 230 is started, the pH value of the electrolyte in the anode reaction zone 120 gradually decreases, and the pH value of the electrolyte in the cathode reaction zone 130 gradually increases;

[0059] S300. The electrolyte in the anode reaction zone 120 is led to the acid solution pool 300, and the electrolyte in the cathode reaction zone 130 is led to the alkali solution pool 400;

[0060] S400. Adding regenerated micropowder to the acid solution pool 300 and stirring to dissolve, standing to settle and solid-liquid separation to obtain an acid solution and a colloidal solid;

[0061] S500. The colloidal solid in the acid solution pool 300 is output to the alkali solution pool 400 through the slag outlet for secondary dissolution reaction, and static precipitation and solid-liquid separation are performed to obtain an alkaline solution;

[0062] S600. The acid solution in the acid tank 300 is discharged to the precipitation reaction tank 500 through the outlet of the acid tank 300, and the alkaline solution in the alkaline tank 400 is discharged to the precipitation reaction tank 500 through the outlet of the alkaline tank 400;

[0063] S700. The acid solution and the alkaline solution are mixed and reacted in the precipitation reaction tank 500, and solid-liquid separation is performed after aging for 24 hours;

[0064] S800. Dry the solid matter obtained from the precipitation reaction tank 500 to obtain reusable regenerated particles.

[0065] Furthermore, the pH values ​​of the solutions in the anode reaction zone 120 and the cathode reaction zone 130 are detected in real time. When the pH value of the electrolyte in the anode reaction zone 120 reaches 1, it is discharged into the acid solution pool 300. When the pH value of the electrolyte in the cathode reaction zone 130 reaches 13, it is discharged into the alkaline solution pool 400.

[0066] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. An electrochemical construction waste powder regeneration and recovery device, characterized in that: include: An electrolytic reaction box, which is used to load electrolyte, wherein a separator is provided in the electrolytic reaction box to divide the electrolytic reaction box into an anode reaction zone and a cathode reaction zone, wherein an anode liquid outlet is provided in the anode reaction zone, and a cathode liquid outlet is provided in the cathode reaction zone; An electrolytic assembly, comprising an anode electrode and a cathode electrode, wherein the anode electrode is disposed in the anode reaction zone, and the cathode electrode is disposed in the cathode reaction zone; An acid liquid tank connected to the anode liquid outlet, the acid liquid tank being provided with a liquid outlet and a slag outlet; An alkali liquid pool, which is connected to the cathode liquid outlet and the slag outlet of the acid liquid pool, and the alkali liquid pool is provided with a liquid outlet; The precipitation reaction tank is connected with the liquid outlet of the acid liquid tank and the liquid outlet of the alkali liquid tank.

2. The electrochemical construction waste powder regeneration and recovery device according to claim 1 is characterized in that: The separation membrane is specifically a porous PTEF membrane.

3. The electrochemical construction waste powder regeneration and recovery device according to claim 1 is characterized in that: The surfaces of the anode electrode and the cathode electrode are both plated with a titanium mesh of PbO2.

4. The electrochemical construction waste powder regeneration and recovery device according to claim 1 is characterized in that: The electrolytic component also includes a direct current power supply, a positive electrode of the direct current power supply is electrically connected to the anode electrode, and a negative electrode of the direct current power supply is electrically connected to the cathode electrode.

5. The electrochemical construction waste powder regeneration and recovery device according to claim 1 is characterized in that: The electrolysis reaction box is a closed box, which is convenient for collecting oxygen and hydrogen generated during the electrolysis process.

6. The electrochemical construction waste powder regeneration and recovery device according to claim 5 is characterized in that: The electrochemical construction waste powder regeneration and recovery device also includes an oxygen storage tank and a hydrogen storage tank. The oxygen storage tank is connected to the anode reaction area of ​​the electrolytic reaction box to collect oxygen, and the hydrogen storage tank is connected to the cathode reaction area of ​​the electrolytic reaction box to collect hydrogen.

7. The electrochemical construction waste powder regeneration and recovery device according to claim 1 is characterized in that: The electrolytic reaction box is provided with a liquid inlet, which is connected to the precipitation reaction tank. The supernatant in the precipitation reaction tank can flow back to the electrolytic reaction box from the liquid inlet of the electrolytic reaction box, thereby recycling the reaction liquid.

8. The electrochemical construction waste powder regeneration and recovery device according to any one of claims 1 to 7, characterized in that: The electrochemical construction waste powder regeneration and recovery device also includes a drying box, which is connected to the slag outlet of the precipitation reaction tank and is used to dry the solid matter obtained by the reaction.

9. A working method for the electrochemical construction waste powder regeneration and recovery device according to any one of claims 1 to 8, characterized in that: include: injecting electrolyte into the electrolysis reaction box; Connecting the anode electrode and the cathode electrode to a direct current power supply and starting the direct current power supply, the pH value of the electrolyte in the anode reaction zone gradually decreases, and the pH value of the electrolyte in the cathode reaction zone gradually increases; Leading the electrolyte in the anode reaction zone to the acid solution pool, and leading the electrolyte in the cathode reaction zone to the alkali solution pool; Adding regenerated micro powder into the acid solution pool and performing stirring and dissolving, static precipitation and solid-liquid separation to obtain an acid solution and a colloidal solid; The colloidal solid in the acid solution pool is discharged to the alkaline solution pool through a slag outlet for secondary dissolution reaction, and static precipitation and solid-liquid separation are performed to obtain an alkaline solution; The acid solution in the acid liquid pool is discharged to the precipitation reaction pool through the liquid outlet of the acid liquid pool, and the alkali solution in the alkali liquid pool is discharged to the precipitation reaction pool through the liquid outlet of the alkali liquid pool; The acid solution and the alkaline solution are mixed and reacted in the precipitation reaction tank, and solid-liquid separation is performed after aging for 24 hours; The solid matter obtained from the precipitation reaction tank is dried to obtain reusable regenerated particles.

10. The working method according to claim 9, characterized in that: When the pH value of the electrolyte in the anode reaction zone reaches 1, it is discharged into the acid solution pool; when the pH value of the electrolyte in the cathode reaction zone reaches 13, it is discharged into the alkali solution pool.

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