Stable control system for cold rolling wastewater

Abstract

The utility model relates to the technical field of water treatment, in particular to a stable control system for cold rolling wastewater, which comprises pretreatment, dual-alkali treatment and resin softening treatment, the cold rolling wastewater is pretreated, and a multi-section pH value detection device is arranged in the pretreatment and dual-alkali treatment process, so that the water quality and the pH value of the cold rolling wastewater are in a stable state capable of being monitored and controlled in the treatment process, and the stable proceeding of the whole process is ensured; and meanwhile, subsequent membrane treatment or evaporative crystallization treatment can be operated more stably, the situation that the whole cold rolling wastewater treatment system is affected by fluctuation of the water quality of the cold rolling wastewater is avoided, and the whole cold rolling wastewater treatment system is more stable and controllable.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a cold rolling wastewater stabilization control system. Background Art

[0002] In the field of water treatment technology, the wastewater discharged from the cold rolling system generally includes emulsion wastewater, pickling wastewater, alkali oil wastewater and coating wastewater. The wastewater contains many pollutants, complex components and large fluctuations in water quality. It is one of the most difficult wastewaters to treat in the metallurgical industry. In recent years, there are more and more zero-emission systems and facilities based on membrane treatment and evaporation crystallization. The content of hardness ions has a great influence on the membrane system and evaporation crystallization device. It is one of the key factors that determine whether the membrane system and evaporation crystallization can operate stably. The commonly used hardness removal methods are: The main stages are: double alkali method, ion exchange method, membrane treatment method, etc., among which the double alkali method is the most adaptable and most commonly used method. The biggest impact of the double alkali method for hardness removal is the fluctuation of the incoming water quality. The fluctuation of water quality will increase the control difficulty of the hardness removal system. Therefore, this patent proposes a cold rolling wastewater stabilization control system, which is combined with the traditional double alkali method to perform a stage of pretreatment on the wastewater, so that the water quality of the wastewater remains stable before entering the double alkali method for hardness removal, thereby achieving stable addition of sodium carbonate and sodium hydroxide during the double alkali method to achieve stable operation of the overall system. Utility Model Content

[0003] To achieve the above objectives, the utility model is implemented through the following technical solutions: The utility model provides a cold rolling wastewater stabilization control system, including:

[0004] The cold rolling wastewater is pretreated to obtain a primary precipitate, reverse osmosis fresh water and reverse osmosis concentrated water, wherein the primary precipitate includes at least iron hydroxide; the reverse osmosis fresh water is industrial water with a TDS content that meets the standard; the reverse osmosis concentrated water has a pH of 8-9 and a calcium ion concentration within a first preset range;

[0005] The reverse osmosis concentrated water is treated by a double alkali method to obtain a secondary precipitate, a tertiary precipitate and a final solution, wherein the secondary precipitate includes at least calcium carbonate; the tertiary precipitate includes at least magnesium hydroxide, and the final solution is a solution with an alkalinity of 100-150 mg / L;

[0006] The final solution is subjected to resin softening treatment, and the final solution is further softened to obtain final effluent, wherein the final effluent is industrial water with a TDS content that meets the standard.

[0007] Preferably, the pretreatment includes a primary pH adjustment treatment, a secondary pH adjustment treatment and a final neutralization treatment;

[0008] The primary pH adjustment treatment is used to generate iron hydroxide precipitation in the cold rolling wastewater and increase the pH value of the cold rolling wastewater to obtain a first solution;

[0009] The secondary pH adjustment process is used to increase the calcium ion concentration in the first solution and increase the pH value of the first solution to obtain the second solution;

[0010] The final neutralization treatment is used to adjust the pH of the second solution and obtain a third solution, wherein the third solution has a pH of 8-9.

[0011] Preferably, the primary pH adjustment treatment includes adding hydroxide ions to the cold rolling wastewater to generate the iron hydroxide precipitate, and making the pH of the first solution between 5-6.

[0012] Preferably, the secondary pH adjustment treatment includes adding calcium hydroxide to the first solution, so that the pH of the second solution is greater than 7, and the calcium ion concentration in the second solution is higher than that in the first solution.

[0013] Preferably, the final neutralization treatment comprises: adding an acid solution or an alkaline solution into the second solution to obtain a third solution having a pH value between 8 and 9.

[0014] Preferably, the pretreatment further comprises a mixing flocculation treatment and a filtration treatment;

[0015] The mixed flocculation treatment is used to collect the primary precipitate in the third solution, wherein the primary precipitate is at least iron hydroxide precipitate and / or a colloid suspended in the third solution;

[0016] The filtration process is used to filter the primary precipitate to obtain a fourth solution, and the fourth solution is a solution containing hardness ions, and the hardness ions are at least calcium ions and magnesium ions.

[0017] Preferably, the pretreatment further comprises reverse osmosis treatment;

[0018] The reverse osmosis treatment is used to concentrate the hardness ions in the fourth solution to obtain the reverse osmosis fresh water and the reverse osmosis concentrated water; the reverse osmosis concentrated water is a solution with a higher hardness ion concentration than the fourth solution.

[0019] Preferably, the double alkali process includes a hardness removal process;

[0020] The hardness removal treatment includes: adding carbonate ions and hydroxide ions to the reverse osmosis concentrated water in sequence to generate calcium carbonate precipitates and magnesium hydroxide precipitates, and obtaining a fifth solution, wherein the pH value of the fifth solution is 11-12.

[0021] Preferably, the double alkali treatment further comprises sequentially performing tubular microfiltration circulation treatment and microfiltration effluent treatment on the fifth solution.

[0022] The tubular microfiltration circulation treatment is used to separate and filter the secondary precipitate and the tertiary precipitate in the fifth solution to obtain a sixth solution, wherein the secondary precipitate is a precipitate containing at least calcium carbonate; and the tertiary precipitate is a precipitate containing at least magnesium hydroxide; thereby obtaining a sixth solution, which is a solution free of calcium carbonate and magnesium hydroxide precipitates;

[0023] The microfiltration effluent treatment is used to adjust the pH value of the sixth solution. An acid solution is added to the sixth solution to reduce the pH value of the sixth solution to obtain a final solution. The pH value of the final solution is 6-8.

[0024] Preferably, during the pretreatment and the double subtraction treatment, one or more pH detection devices are provided, and each of the pH detection devices is used to detect the pH of the solution during the pretreatment and the double subtraction treatment.

[0025] In the utility model, a cold rolling wastewater stabilization control system is provided, including pretreatment, double alkali treatment and resin softening treatment; the pretreatment is used to stabilize the water quality of the cold rolling wastewater, specifically to precipitate the iron ions in the cold rolling wastewater, and\or, colloids and other substances suspended in the cold rolling wastewater, and at the same time, through the addition of slaked lime and the detection of various pH detection devices, the calcium ion concentration and pH of the cold rolling wastewater are in a stable state; the double alkali treatment is used to precipitate and filter out the hardness ions in the cold rolling wastewater, and detect the pH of the cold rolling wastewater through various acid-base detectors; the resin softening treatment is used to further adsorb the hardness ions in the cold rolling wastewater and obtain industrial water that meets the standards. After the above treatment, the water quality of the cold rolling wastewater is always in a monitorable and stable state during the overall cold rolling wastewater treatment process, so that the cold rolling wastewater no longer contains excess substances including iron ions or colloids when entering the double alkali method treatment process, and the pH and calcium ion content remain stable, and the pH of the cold rolling wastewater is controllable before entering the resin softening treatment, thereby ensuring the stability of the resin softening treatment and avoiding the influence of acidic or alkaline water on the resin; by realizing the stable control of the water quality of the cold rolling wastewater during the cold rolling wastewater zero discharge system process, the stability of the overall reaction is guaranteed, and at the same time, the subsequent membrane treatment and evaporation crystallization treatment are ensured to be more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the process of a cold rolling wastewater stabilization control system proposed by the utility model; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. The term "proximal end" is usually the end close to the operator, and the term "distal end" is usually the end close to the patient. "One end" and "the other end" as well as "proximal end" and "distal end" usually refer to two corresponding parts, which include not only the endpoints. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. In addition, as used in the present utility model, an element is arranged on another element, which usually only means that there is a connection, coupling, matching or transmission relationship between the two elements, and the connection, coupling, matching or transmission between the two elements can be direct or indirect through an intermediate element, and it cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any position such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Please refer to Figure 1 As shown, a flow diagram of a cold rolling wastewater stabilization control system provided in the utility model includes pretreatment, double alkali treatment and resin softening treatment; the pretreatment includes primary pH adjustment treatment, secondary pH adjustment treatment, final neutralization treatment, mixed flocculation treatment, filtration treatment and reverse osmosis treatment, the pretreatment is used to pretreat the cold rolling wastewater, preliminarily adjust the pH of the cold rolling wastewater, and precipitate the iron ions in the cold rolling wastewater to obtain primary precipitate, reverse osmosis fresh water and reverse osmosis concentrated water; the double alkali treatment includes hardness removal treatment, tubular microfiltration circulation treatment and microfiltration effluent treatment, which are used to further treat the reverse osmosis concentrated water to obtain secondary precipitate, tertiary precipitate and final solution in sequence; the resin softening treatment includes a resin softening device, which is used to perform final treatment on the final solution, precipitate the hardness ions in the final solution, and obtain final effluent, and the final effluent is industrial water that meets the standards.

[0031] The cold rolling wastewater is generally wastewater with a pH of 0-4, a suspended solids content of 100-300 mg / L, and a total iron content of 100-1000 mg / L.

[0032] In this embodiment, the primary pH adjustment treatment includes a primary pH adjustment tank, a first pH detection device is provided at the end of the primary pH adjustment tank, the cold rolling wastewater is transported to the primary pH adjustment tank, the primary pH adjustment tank is also provided with a sodium hydroxide automatic regulating valve, the sodium hydroxide automatic regulating valve is opened, and sodium hydroxide solution is added to the primary pH adjustment tank, the sodium hydroxide automatic regulating valve cooperates with the first pH detection device, when the pH value of the solution in the primary pH adjustment tank fed back by the first pH detection device reaches 5-6, the sodium hydroxide automatic regulating valve is closed, and the addition of sodium hydroxide solution to the primary pH adjustment tank is stopped; the chemical reaction formula occurring in the primary pH adjustment tank at this stage is: H + +NaOH=Na + +H2O and Fe 3+ +3OH - =Fe(OH)3; the effluent from the primary pH adjustment tank is a first solution, which is a solution containing iron hydroxide precipitate and a pH of 5-6.

[0033] In other alternative embodiments, the sodium hydroxide automatic regulating valve may also be a water pump, which is used to automatically add sodium hydroxide solution to the primary pH adjustment tank. The sodium hydroxide automatic regulating valve or water pump is prior art, so this application does not make too many restrictions or elaborations here.

[0034] In this embodiment, the secondary pH adjustment process includes a secondary pH adjustment tank, a second pH detection device is provided at the end of the secondary pH adjustment tank, the first solution is transported to the secondary pH adjustment tank, the secondary pH adjustment tank is also provided with a slaked lime automatic regulating valve, the slaked lime automatic regulating valve is opened, and slaked lime solution is added to the secondary pH adjustment tank, the slaked lime automatic regulating valve cooperates with the second pH detection device, when the pH value of the solution in the secondary pH adjustment tank fed back by the secondary pH detection device reaches 8-9, the slaked lime automatic regulating valve is closed, and the addition of slaked lime solution to the secondary pH adjustment tank is stopped; the chemical reaction formula occurring in the secondary pH adjustment tank at this stage is: 2H + +Ca(OH)2=Ca 2+ +2H2O; the effluent from the secondary pH adjustment tank is a second solution, which is a solution containing iron hydroxide precipitate, calcium ions and a pH of 8-9.

[0035] In other alternative embodiments, the slaked lime automatic regulating valve may also be a water pump, which is used to automatically add slaked lime solution to the secondary pH adjustment tank. The slaked lime automatic regulating valve or water pump is prior art, so this application does not make too many limitations or elaborations here.

[0036] In this embodiment, the final neutralization treatment has a final neutralization treatment tank, and the final neutralization treatment tank has a third pH detection device. The final neutralization treatment is used to prevent the pH of the second solution from deviating and failing to reach 8-9. When the pH of the second solution fed back by the third pH detection device is lower than 8, an alkaline solution is added to the second solution to increase the pH of the second solution; when the pH of the second solution fed back by the third pH detection device is higher than 9, an acid solution is added to the second solution to reduce the pH of the second solution; thereby ensuring that the pH of the second solution is stably controlled within 8-9 when entering the mixed flocculation treatment. The final neutralization treatment effluent is the third solution, and the third solution is a solution with a pH between 8-9.

[0037] It is worth noting that the acid solution is usually hydrochloric acid, and the alkaline solution is usually sodium hydroxide. In other alternative embodiments, the acid solution may also be other acidic solutions, and the alkaline solution may also be other alkaline solutions. This application does not make too many restrictions here.

[0038] In this embodiment, the mixed flocculation treatment is to sequentially add PAM and PAC to the third solution, wherein the PAM is polyacrylamide and the PAC is polyaluminum chloride; the mixed flocculation treatment is used to coagulate the first precipitate in the third solution, wherein the first precipitate includes various precipitates and suspended matter in the third solution, including at least impurities such as iron hydroxide precipitate in the third solution and colloids suspended in the third solution; the mixed flocculation treatment technology is prior art, so this application will not go into details here.

[0039] It is worth noting that the third solution after the mixed flocculation treatment enters the filtration treatment, and the filtration treatment filters and discharges the first precipitate condensed in the third solution at this time, thereby obtaining the fourth solution. The fourth solution is a solution containing various hardness ions, and the hardness ions are ions that can make the water hard, at least calcium ions and magnesium ions. At this time, the calcium ion concentration in the fourth solution is 65-80 mg / L, and the pH is 6.5-7.5.

[0040] In this embodiment, the fourth solution is transported to a reverse osmosis treatment, and the reverse osmosis treatment is used to further treat the fourth solution to obtain reverse osmosis fresh water and reverse osmosis concentrated water, respectively, so that hardness ions such as calcium ions in the fourth solution are enriched in the reverse osmosis concentrated water, and at the same time, the reverse osmosis fresh water is discharged after reaching the industrial water quality standard, and the reverse osmosis fresh water can be used as industrial water; wherein, the total hardness of the fourth solution is 950-1100 mg / L, the calcium ion concentration reaches the first preset range, the first preset range is 200-250 mg / L, and the magnesium ion concentration is less than 60 mg / L.

[0041] It is worth noting that the reverse osmosis treatment is also a reverse osmosis treatment, that is, the solvent in the solution is separated by the membrane separation principle, a membrane is added to one side of the solution, and then pressure is applied to the solution side so that the pressure exceeds the solvent osmotic pressure. At this time, the solvent will reversely permeate against the natural osmosis direction, thereby obtaining the permeated solvent on the low-pressure side of the membrane and the concentrated solution on the high-pressure side of the membrane; the reverse osmosis treatment is a prior art, so this application will not go into details here.

[0042] In this embodiment, the reverse osmosis concentrate is transported to a hardness removal treatment, in which a sodium carbonate solution is added to the reverse osmosis concentrate, and the sodium carbonate solution reacts with the calcium ions in the reverse osmosis concentrate to obtain a calcium carbonate precipitate; then a sodium hydroxide solution is added to the reverse osmosis concentrate containing the calcium carbonate precipitate, so that the magnesium hydroxide solution reacts with the magnesium ions in the reverse osmosis concentrate to obtain a magnesium hydroxide precipitate. At the same time, as the hydroxide ions enter the reverse osmosis concentrate, the pH value of the reverse osmosis concentrate increases; a fourth pH detection device is provided at the end point of the hardness removal treatment, and the fourth pH detection device is used to detect the pH value of the reverse osmosis concentrate during the hardness removal process. When the pH value of the reverse osmosis concentrate during the hardness removal process reaches 11-12, the addition of the sodium hydroxide solution is stopped, the hardness removal treatment is terminated, and a fifth solution is obtained. The fifth solution is a solution containing at least calcium carbonate precipitate and magnesium hydroxide precipitate, and the pH value is 11-12.

[0043] In this embodiment, the fifth solution is transported to the tubular microfiltration circulation treatment, and the tubular microfiltration circulation treatment is used to separate, filter and discharge the secondary precipitate and tertiary precipitate in the reverse osmosis concentrated water in the fifth solution, wherein the secondary precipitate is a precipitate containing at least calcium carbonate precipitate, and the tertiary precipitate is a precipitate containing at least magnesium hydroxide, thereby obtaining a sixth solution that is almost free of calcium carbonate and magnesium hydroxide; the sixth solution enters the microfiltration effluent treatment; it is worth noting that the tubular microfiltration circulation treatment is a prior art, so this application will not go into details here.

[0044] The end point of the tubular microfiltration effluent treatment is provided with a fifth pH detection device, which is used to detect the pH of the fifth solution during the microfiltration effluent treatment process; the microfiltration effluent treatment is used to adjust the pH of the sixth solution, and hydrochloric acid solution is added to the sixth solution to reduce the pH of the sixth solution. When the fifth pH detection device feeds back that the pH of the sixth solution reaches 6-8, the addition of hydrochloric acid solution is stopped, the microfiltration effluent treatment is terminated, and a final solution is obtained. The pH of the final solution is 6-8, and the final solution almost no longer contains calcium ions and magnesium ions.

[0045] It is worth noting that each of the pH detection devices mentioned in the present application is an electronic pH detector. In other alternative embodiments, each of the pH detection devices may also be a pH test paper. Each of the pH detection devices is used to detect the pH value of the solution. The pH detection device is a prior art, so this application does not make too many limitations and elaborations here.

[0046] In this embodiment, the final effluent is transported to a resin softening treatment, which includes a resin softening device having a resin therein. The resin is used to further adsorb hardness ions and impurities in the final solution to obtain the final effluent, which is industrial water that meets the standards.

[0047] It is worth noting that the resin softening device is a cationic bed, which is also a water softener. The resin softening device is a prior art and this application does not make too many limitations and redundant descriptions here.

[0048] In summary, in the utility model, a cold rolling wastewater stable control system is proposed. By pre-treating the cold rolling wastewater, the water quality of the cold rolling wastewater is always in a monitorable and stable state during the overall cold rolling wastewater treatment process, so that the cold rolling wastewater no longer contains excess substances including iron ions or colloids when entering the double alkali method treatment process, and the pH and calcium ion content remain stable, and the pH of the cold rolling wastewater is controllable before entering the resin softening treatment, thereby ensuring the stability of the resin softening treatment and avoiding the influence of acidic or alkaline water on the resin; by realizing the stable control of the water quality of the cold rolling wastewater during the cold rolling wastewater zero discharge system, the stability of the overall reaction is guaranteed, and at the same time, the subsequent membrane treatment and evaporation crystallization treatment are ensured to be more stable.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A cold rolling wastewater stabilization control system, characterized in that: include: A pH adjustment tank, a neutralization treatment tank and a reverse osmosis treatment device are used to pre-treat the cold rolling wastewater to obtain a primary precipitate, reverse osmosis fresh water and reverse osmosis concentrated water, wherein the primary precipitate includes at least iron hydroxide; the reverse osmosis fresh water is industrial water with a TDS content that meets the standard; the reverse osmosis concentrated water has a pH of 8-9 and a calcium ion concentration within a first preset range; A reagent dosing pool for treating the reverse osmosis concentrated water with a double alkali method, wherein the reagent dosing pool is used to obtain a secondary precipitate, a tertiary precipitate and a final solution, wherein the secondary precipitate includes at least calcium carbonate; the tertiary precipitate includes at least magnesium hydroxide, and the final solution is a solution with an alkalinity of 100-150 mg / L; The resin softening device performs resin softening treatment on the final solution, further softens the final solution to obtain final effluent, and the final effluent is industrial water with a TDS content that meets the standard.

2. A cold rolling wastewater stabilization control system according to claim 1, characterized in that: The pH adjustment tank includes a primary pH adjustment tank and a secondary pH adjustment tank; The primary pH adjustment tank is used to generate iron hydroxide precipitation in the cold rolling wastewater and increase the pH value of the cold rolling wastewater to obtain a first solution; The secondary pH adjustment tank is used to increase the calcium ion concentration in the first solution and increase the pH value of the first solution to obtain a second solution; The end point of the primary pH adjustment tank is connected to the starting point of the secondary pH adjustment tank.

3. A cold rolling wastewater stabilization control system according to claim 2, characterized in that: The neutralization treatment tank is used to adjust the pH of the second solution and obtain a third solution, wherein the third solution has a pH of 8-9; The reverse osmosis treatment device is used to further process the third solution and obtain the reverse osmosis fresh water and the reverse osmosis concentrated water; The end point of the neutralization treatment tank is communicated with the starting point of the reverse osmosis treatment device.

4. A cold rolling wastewater stabilization control system according to claim 3, characterized in that: The cold rolling wastewater stabilization control system also includes a mixing flocculation treatment tank and a filtering device; The mixed flocculation treatment tank is used to collect the primary precipitate in the third solution, wherein the primary precipitate is at least iron hydroxide precipitate and / or colloid suspended in the third solution; The filtering device is used to filter the primary precipitate to obtain a fourth solution, and the fourth solution is a solution containing hardness ions, and the hardness ions are at least calcium ions and magnesium ions.

5. A cold rolling wastewater stabilization control system according to claim 2, characterized in that: The reagent dosing pool contains sodium carbonate solution and sodium hydroxide solution; The sodium carbonate solution is used to react with calcium ions in the reverse osmosis concentrated water to generate calcium carbonate precipitates; The sodium hydroxide solution is used to react with the magnesium ions in the reverse osmosis concentrated water to generate magnesium hydroxide precipitate; A fifth solution is obtained at the end point of the reagent dosing pool, and the pH value of the fifth solution is between 11 and 12.

6. A cold rolling wastewater stabilization control system according to claim 5, characterized in that: The cold rolling wastewater stabilization control system includes a tubular microfiltration treatment device, which is used to separate and filter the secondary precipitate and the tertiary precipitate in the fifth solution to obtain a sixth solution, wherein the secondary precipitate is a precipitate containing at least calcium carbonate; the tertiary precipitate is a precipitate containing at least magnesium hydroxide; thereby obtaining a sixth solution, which is a solution without calcium carbonate and magnesium hydroxide precipitates.

7. A cold rolling wastewater stabilization control system according to claim 6, characterized in that: The cold rolling wastewater stabilization control system also includes a microfiltration water outlet device; The microfiltration water outlet device is used to adjust the pH value of the sixth solution. The microfiltration water outlet device has an acid solution. The acid solution is used to reduce the pH value of the sixth solution and obtain a final solution. The pH value of the final solution is 6-8.

8. A cold rolling wastewater stabilization control system according to claim 7, characterized in that: One or more pH detection devices are provided in the primary pH adjustment tank, the secondary pH adjustment tank, the reverse osmosis treatment device, the reagent dosing tank, the tubular microfiltration treatment device and the microfiltration effluent device. Each of the pH detection devices is used to detect the pH of the solution in the primary pH adjustment tank, the secondary pH adjustment tank, the reverse osmosis treatment device, the reagent dosing tank, the tubular microfiltration treatment device and the microfiltration effluent device.

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