Silicon steel pickling system

Abstract

This application discloses a silicon steel pickling system, including an acid tank, a pickling tank, an acid supply pipeline, an acid reuse pipeline, an acid impurity removal pipeline, an acid direct discharge pipeline, an acid recovery pipeline, and an acid precipitation tank. Both ends of the acid supply pipeline and the acid reuse pipeline are connected to the acid tank and the pickling tank, respectively. The acid supply pipeline, the acid reuse pipeline, the acid tank, and the pickling tank constitute an acid pickling circulation loop. The acid impurity removal pipeline includes a first power component arranged sequentially along the medium flow direction and a mixing tank for adding a coagulant aid. The height of the mixing tank is higher than that of the acid precipitation tank. The output end of the first power component is connected to the acid tank, and the overflow port of the mixing tank is connected to the acid precipitation tank. Both ends of the acid recovery pipeline are connected to the acid tank and the acid precipitation tank, respectively. The acid tank, the acid impurity removal pipeline, the acid precipitation tank, and the acid recovery pipeline constitute an acid recovery loop. The input end of the acid direct discharge pipeline is connected to the acid impurity removal pipeline and is located between the mixing tank and the first power component. The output end is connected to the acid precipitation tank.

Description

Technical Field

[0001] This application belongs to the field of silicon steel pickling technology, specifically relating to a silicon steel pickling system. Background Technology

[0002] Silicon steel needs to be pickled in a pickling tank with hydrochloric acid after hot rolling and before cold rolling to remove the iron oxide scale on the surface of the silicon steel.

[0003] In related technologies, an acid tank is used to supply acid to an acid pickling tank. The acid in the acid pickling tank is then returned to the acid tank. The acid tank is connected to a mixing tank and an acid precipitation tank in sequence through pipelines. Therefore, the acid with iron oxide scale in the acid tank is sent to the mixing tank to add coagulant for purification. Then, the clean acid in the upper layer flows to the acid precipitation tank by gravity through the overflow pipe, and then flows back to the acid tank for reuse.

[0004] During the production process, ferric silicate salts from hydrochloric acid precipitate and adhere to pipes, valves, tank walls, and pump cavities that come into contact with the hydrochloric acid. As the deposits thicken, they detach as hard flakes, clogging pipes, nozzles, pumps, and other equipment, forcing the unit to shut down for cleaning. The cleaning process requires first draining the acid from the acid tank and then adding alkaline solution for further cleaning. However, the acid in the acid tank must first enter a mixing tank before being drained to the acid precipitation tank, resulting in a long draining time and low efficiency. Summary of the Invention

[0005] To address the current technical problem of low acid removal efficiency, this application provides a silicon steel pickling system.

[0006] This application provides a silicon steel pickling system, including an acid tank, a pickling tank, an acid supply pipeline, an acid reuse pipeline, an acid impurity removal pipeline, an acid direct discharge pipeline, an acid recovery pipeline, and an acid precipitation tank;

[0007] Both ends of the acid supply pipeline and the acid reuse pipeline are connected to the acid tank and the pickling tank. The acid supply pipeline, the acid reuse pipeline, the acid tank and the pickling tank constitute an acid pickling circulation loop.

[0008] The acid impurity removal pipeline includes a first power component arranged sequentially along the medium flow direction and a mixing tank for adding coagulant aid. The height of the mixing tank is higher than that of the acid precipitation tank. The output end of the first power component is connected to the acid tank, and the overflow port of the mixing tank is connected to the acid precipitation tank. The two ends of the acid recovery pipeline are respectively connected to the acid tank and the acid precipitation tank. The acid tank, the acid impurity removal pipeline, the acid precipitation tank, and the acid recovery pipeline constitute an acid liquid recovery circuit.

[0009] The input end of the acid direct discharge pipeline is connected to the acid impurity removal pipeline and is located between the mixing tank and the first power component, while the output end is connected to the acid precipitation tank.

[0010] In some embodiments, the acid direct discharge pipeline includes a vertical pipe section for inserting acid into the acid precipitation tank, the lower end of the vertical pipe section being closed and the side having an acid discharge hole.

[0011] In some embodiments, multiple drainage holes are provided, and the multiple drainage holes are distributed at intervals on the circumference of the vertical pipe section.

[0012] In some embodiments, the acid direct discharge pipeline further includes a direct discharge pipe section and a direct discharge valve installed on the direct discharge pipe section, the direct discharge pipe section being connected to the input end of the vertical pipe section.

[0013] In some embodiments, the acid purification pipeline includes a purification valve connected in series with the first power unit, and the input end of the straight-through pipeline is located between the first power unit and the purification valve.

[0014] In some embodiments, the system further includes an alkali supply pipeline, a cleaning return pipeline, and an alkali recovery pipeline. The output end of the alkali supply pipeline is connected to the acid tank. The input end of the cleaning return pipeline is located between the first power unit and the mixing tank, and the output end is connected to the acid tank, so that the acid tank, the first power unit, and the cleaning return pipeline form a cleaning loop. The input end of the alkali recovery pipeline is located between the first power unit and the mixing tank.

[0015] In some embodiments, a water supply line is also included, the output end of which is connected to the acid tank.

[0016] In some embodiments, both the alkali supply pipeline and the water supply pipeline include a second power component and a supply valve connected in series.

[0017] In some embodiments, there are two acid supply lines, which are connected in parallel.

[0018] In some embodiments, the acid supply line includes a third power unit, a steam regulating valve, and an electrically controlled valve connected in series.

[0019] The silicon steel pickling system provided in this application includes an acid tank, a pickling tank, an acid supply pipeline, an acid reuse pipeline, an acid impurity removal pipeline, an acid direct discharge pipeline, an acid recovery pipeline, and an acid precipitation tank. Both ends of the acid supply pipeline and the acid reuse pipeline are connected to the acid tank and the pickling tank, respectively. The acid supply pipeline, the acid reuse pipeline, the acid tank, and the pickling tank constitute a pickling circulation loop. The acid impurity removal pipeline includes a first power component arranged sequentially along the medium flow direction and a mixing tank for adding a coagulant aid. The mixing tank is higher than the acid precipitation tank. The output end of the first power unit is connected to the acid tank. The overflow port of the mixing tank is connected to the acid precipitation tank. The two ends of the acid recovery pipeline are respectively connected to the acid tank and the acid precipitation tank. The acid tank, the acid impurity removal pipeline, the acid precipitation tank, and the acid recovery pipeline constitute an acid recovery circuit. The input end of the acid direct discharge pipeline is connected to the acid impurity removal pipeline and is located between the mixing tank and the first power unit. The output end is connected to the acid precipitation tank.

[0020] The acid solution in the acid tank flows into the pickling tank through the acid supply pipeline to clean the silicon steel, and then flows back into the acid tank through the acid recycling pipeline for reuse. However, relying solely on the pickling circulation loop, the amount of iron oxide scale in the acid solution will increase with each pickling of the silicon steel. Under the action of a primary power component, such as a power pump, the acid solution in the acid tank can flow into a mixing tank. A coagulant can be added to the mixing tank to help the iron oxide scale in the acid solution form large agglomerates. Because these large agglomerates are denser, they are mostly distributed at the bottom of the mixing tank. Since the mixing tank is higher than the acid settling tank, the upper layer of acid solution can overflow into the acid settling tank under gravity. The acid solution continues to settle in the acid settling tank, and the clear liquid on top can flow back into the acid tank through the acid recovery pipeline to participate in the pickling of the silicon steel. Even if iron oxide scale impurities enter the acid solution in the acid tank after pickling the silicon steel, they can be removed through a purification pipeline, ensuring that the acid solution in the acid tank still has a high purity and enabling continuous pickling of the silicon steel.

[0021] The input end of the acid direct discharge pipeline is connected to the acid impurity removal pipeline and is located between the mixing tank and the first power unit, while the output end is connected to the acid precipitation tank. Because ferric silicate will precipitate in the acid solution, it will adhere to the pipes, valves, tank walls, and pump chambers through which the acid flows. This ferric silicate deposit will continuously grow and eventually detach into the acid solution as flakes, clogging pipes and pumps. Therefore, it is necessary to first drain all the acid from the acid tank and then clean the acid washing system to clear the blockage.

[0022] The input end of the acid direct discharge pipeline is connected to the acid impurity removal pipeline and is located between the mixing tank and the first power unit. The acid direct discharge pipeline is directly connected to the acid precipitation tank. Thus, under the power of the first power unit, the acid in the acid tank can flow through the acid direct discharge pipeline to the acid precipitation tank. Compared with the method of discharging the acid in the acid tank through the mixing tank and then discharging the acid to the acid precipitation tank through the overflow port under gravity, this application can increase the power of the first power unit as needed, increase the discharge flow rate of the acid, reduce the acid discharge time, and improve the acid discharge efficiency. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a silicon steel pickling system in one or more embodiments of this application is shown.

[0024] Figure 2 It shows Figure 1 A schematic diagram of the silicon steel pickling system.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100-Silicon steel pickling system; 110-Pickling circulation loop; 111-Acid supply pipeline; 1111-Third power unit; 1112-Steam regulating valve; 1113-Electrically controlled valve; 112-Acid reuse pipeline; 1121-Reuse valve; 113-Acid tank; 114-Pickling tank.

[0027] 120-Acid recovery circuit, 121-Acid removal pipeline, 1211-First power unit, 1212-Removal valve, 1213-Mixing tank, 122-Acid precipitation tank, 123-Acid recovery pipeline, 130-Acid direct discharge pipeline, 131-Direct discharge valve; 140a-Water supply pipeline, 140b-Alkali supply pipeline, 141-Second power unit, 142-Supply valve, 143-Storage tank; 150-Cleaning circuit, 151-Cleaning return pipeline, 1511-Cleaning valve, 160-Alkali recovery pipeline, 161-Alkali recovery tank, 162-Alkali recovery valve. Detailed Implementation

[0028] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0029] This application provides a silicon steel pickling system that features rapid acid removal and high efficiency.

[0030] Please see Figure 1 as well as Figure 2 The silicon steel pickling system 100 provided in this application includes an acid tank 113, a pickling tank 114, an acid supply pipeline 111, an acid reuse pipeline 112, an acid impurity removal pipeline 121, an acid direct discharge pipeline 130, an acid recovery pipeline 123, and an acid precipitation tank 122.

[0031] Both ends of the acid supply pipeline 111 and the acid reuse pipeline 112 are connected to the acid tank 113 and the pickling tank 114. The acid supply pipeline 111, the acid reuse pipeline 112, the acid tank 113, and the pickling tank 114 constitute the pickling circulation loop 110. The acid impurity removal pipeline 121 includes a first power component 1211 arranged sequentially along the medium flow direction and a mixing tank 1213 for adding coagulant. The height of the mixing tank 1213 is higher than that of the acid precipitation tank 122. The output end of the first power component 1211 is connected to the acid tank 113. The overflow port of the mixing tank 1213 is connected to the acid precipitation tank 122. Both ends of the acid recovery pipeline 123 are connected to the acid tank 113 and the acid precipitation tank 122, respectively. The acid tank 113, the acid impurity removal pipeline 121, the acid precipitation tank 122, and the acid recovery pipeline 123 constitute the acid recovery loop 120.

[0032] Acid tank 113 stores acid, such as hydrochloric acid. The acid flows into pickling tank 114 through acid supply pipeline 111 to clean silicon steel, and then flows back to acid tank 113 through acid recycling pipeline 112 for reuse. Pickling of silicon steel and recycling of acid are achieved through pickling circulation loop 110.

[0033] However, relying solely on the pickling circulation loop 110, the amount of iron oxide scale in the acid solution will increase with each pickling of silicon steel. The iron oxide scale impurities in the acid solution can be removed through the acid removal pipeline 121. Specifically, under the action of the first power component 1211, such as a power pump, the acid solution in the acid tank 113 can flow into the mixing tank 1213. A coagulant can be added to the mixing tank 1213 to help the iron oxide scale in the acid solution form large agglomerates. Because of their high density, these large agglomerates are mostly distributed at the bottom of the mixing tank 1213. Since the mixing tank 1213 is higher than the acid precipitation tank 122, the upper layer of acid solution can overflow into the acid precipitation tank 122 under gravity. The acid solution continues to settle in the acid precipitation tank 122, and the clear liquid at the top can flow back into the acid tank 113 through the acid recovery pipeline 123 to participate in the pickling of silicon steel. Even if iron oxide scale impurities enter the acid solution in acid tank 113 after pickling silicon steel, they can be removed through the impurity removal pipeline to ensure that the acid solution in acid tank 113 still has high purity, thus enabling continuous pickling of silicon steel.

[0034] The input end of the acid direct discharge pipeline 130 is connected to the acid impurity removal pipeline 121 and is located between the mixing tank 1213 and the first power unit 1211, while the output end is connected to the acid precipitation tank 122. Since ferric silicate will precipitate in the acid solution, it will adhere to the pipes, valves, tank walls, and pump chambers through which the acid flows. This ferric silicate deposit will continuously grow and eventually detach into the acid solution as flakes, clogging pipes and pumps. Therefore, it is necessary to first drain all the acid from the acid tank 113 and then clean the acid washing system to clear the blockage.

[0035] The input end of the acid direct discharge pipeline 130 is connected to the acid impurity removal pipeline 121 and is located between the mixing tank 1213 and the first power unit 1211. The acid direct discharge pipeline 130 is directly connected to the acid precipitation tank 122. Thus, under the power of the first power unit 1211, the acid in the acid tank 113 can flow through the acid direct discharge pipeline 130 to reach the acid precipitation tank 122. Compared with the method of discharging the acid in the acid tank 113 through the mixing tank 1213 and discharging the acid to the acid precipitation tank 122 through the overflow port of the mixing tank 1213 under the action of gravity, this application can increase the power of the first power unit 1211 as needed, increase the discharge flow rate of the acid, reduce the acid discharge time, and improve the acid discharge efficiency.

[0036] For pickling of silicon steel, please refer to some embodiments. Figure 2 The acid supply pipeline 111 includes a third power unit 1111, a steam regulating valve 1112, and an electrically controlled valve 1113 connected in series. The third power unit 1111 provides the power for the acid solution to flow from the acid tank 113 to the pickling tank 114. The steam regulating valve 1112 can heat the acid solution in the pipeline with steam, improving the pickling effect. During the cleaning process of the acid supply pipeline 111, the cleaning solution (generally alkaline solution) in the pipeline can also be heated with steam to increase the reaction with the ferric silicate flakes in the pipeline, ensuring the cleaning effect. The electrically controlled valve 1113 can control the opening or closing of the acid supply pipeline 111. During the pickling of silicon steel or the cleaning of the pipeline, the electrically controlled valve 1113 is opened, and the acid supply pipeline 111 is open. During the acid drainage process before stopping the pickling of silicon steel and before the pipeline cleaning, the electrically controlled valve 1113 is closed, and the acid supply pipeline 111 is closed.

[0037] In some embodiments, please refer to Figure 2 Two acid supply pipelines 111 are provided, and the two acid supply pipelines 111 are connected in parallel. That is, the input ends of both acid supply pipelines 111 are connected to the acid tank 113, and the output ends of both are connected to the pickling tank 114. The two output ends can be located between the acid recycling pipeline 112, so as to realize the flow field of acid liquid entering from both sides and exiting from the middle in the pickling tank 114, thereby improving the pickling effect. In some other embodiments, more acid supply pipelines 111 can be provided as needed, such as three, which is not limited in this application.

[0038] In some embodiments, the acid direct discharge pipeline 130 includes a vertical pipe section for inserting acid into the acid precipitation tank 122, the lower end of the vertical pipe section is closed, and an acid discharge hole is provided on the side.

[0039] Acid sedimentation will occur in acid precipitation tank 122. Iron oxide scale agglomerates (silica sludge) are located at the bottom of acid precipitation tank 122. The acid drain hole is set on the side of the vertical pipe section to reduce the disturbance of acid in acid precipitation tank 122, maintain the clarity of supernatant, and reduce the impact of turbid acid being directly injected into the upper layer on silica sludge sedimentation.

[0040] In other embodiments, the vertical section of the acid straight discharge pipe can also have an acid discharge hole directly opened at the end, which can also realize the rapid discharge of acid in the acid tank 113. However, this will reduce the clarity of the supernatant. After the acid washing system is cleaned, the acid flowing back to the acid tank 113 through the acid recovery pipe 123 has low clarity, and the acid washing effect of silicon steel is reduced.

[0041] In some embodiments, multiple drainage holes are provided, such as two or three, and these drainage holes are spaced apart on the circumference of the vertical pipe section. Increasing the number of drainage holes can increase the drainage cross-sectional area and ensure the efficient drainage of acid from acid tank 113 to acid precipitation tank 122.

[0042] In some embodiments, the vertical pipe section can be connected to multiple acid discharge pipes, which are connected to the pipe body of the vertical pipe section. The openings of the multiple acid discharge pipes form acid discharge holes, which can also achieve efficient acid discharge from the acid tank 113 to the acid precipitation tank 122.

[0043] In some embodiments, the acid direct discharge pipeline 130 further includes a direct discharge pipe section and a direct discharge valve 131 installed on the direct discharge pipe section. The direct discharge pipe section is connected to the input end of the vertical pipe section. The direct discharge valve is used to control the opening and closing of the direct discharge pipe section. When the acid washing is stopped and the acid needs to be discharged and then the alkaline washing system is needed, the direct discharge valve opens, the direct discharge pipe section is connected, and under the action of the first power component 1211, the acid in the acid tank 113 is discharged sequentially through the first power component 1211, the direct discharge pipe section, and the vertical pipe section into the acid precipitation tank 122.

[0044] In some embodiments, please refer to Figure 2 The acid removal pipeline 121 includes a removal valve 1212 connected in series with the first power component 1211, and the input end of the straight pipeline is located between the first power component 1211 and the removal valve 1212.

[0045] The impurity removal valve 1212 can be set to open or close the acid impurity removal pipeline 121. During the pickling of silicon steel, the impurity removal valve 1212 is opened, the acid impurity removal pipeline 121 is opened, and the acid in the acid tank 113 can enter the mixing tank 1213 to flocculate and precipitate the silica mud. When it is necessary to drain the acid in the acid tank 113, the impurity removal valve 1212 is closed, the acid impurity removal pipeline 121 is closed, the direct discharge valve 131 is opened, and the acid in the acid tank 113 is quickly discharged into the acid precipitation tank 122 through the direct discharge pipeline.

[0046] In some other embodiments, the input end of the direct discharge pipeline can also be directly connected to the acid tank 113, which can also enable the acid in the acid tank 113 to be quickly discharged into the acid precipitation tank 122 through the direct discharge pipeline. However, in this case, a power pump needs to be installed on the direct discharge pipeline to provide power.

[0047] Having clarified the pickling circulation loop 110, acid recovery loop 120, and acid direct discharge pipeline 130 in the silicon steel pickling system 100, the following describes the relevant content for cleaning the ferrosilicon salt flakes in the pickling circulation loop 110. Ferrosilicon salt crystals can be dissolved using a 12% concentration of NaOH.

[0048] In some embodiments, please refer to Figure 2 The silicon steel pickling system 100 also includes an alkali supply pipeline 140b, a cleaning return pipeline 151, and an alkali recovery pipeline 160. The output end of the alkali supply pipeline 140b is connected to the acid tank 113. The input end of the cleaning return pipeline 151 is located between the first power unit 1211 and the mixing tank 1213, and the output end is connected to the acid tank 113, so that the acid tank 113, the first power unit 1211, and the cleaning return pipeline 151 form a cleaning circuit 150. The input end of the alkali recovery pipeline 160 is located between the first power unit 1211 and the mixing tank 1213.

[0049] After the acid in acid tank 113 is almost completely discharged into acid precipitation tank 122, alkali solution is supplied to acid tank 113 through alkali solution supply pipeline 140b. The alkali solution can circulate through cleaning circuit 150 to clean the first power unit 1211 and the pipeline connected to the first power unit 1211. At the same time, the alkali solution in acid tank 113 can also flow through acid washing circulation circuit 110 to clean acid supply pipeline 111 and acid reuse pipeline 112.

[0050] In some embodiments, the cleaning return pipe 151 is provided with a cleaning valve 1511, thereby realizing the opening and closing of the cleaning return pipe 151.

[0051] In some embodiments, the silicon steel pickling system 100 further includes a water supply pipeline 140a, the output end of which is connected to the acid tank 113. If the concentration of the alkali solution supplied by the alkali supply pipeline 140b is too high, the water supply pipeline 140a can supply water to the acid tank 113 to reduce the alkali concentration within the tank. Additionally, the water supply pipeline 140a can also supply water to the acid tank 113 separately, thereby enabling water cleaning of the acid supply pipeline 111 and the acid recycling pipeline 112. In other words, the acid supply pipeline 111 and the acid recycling pipeline 112 can use either water cleaning or high-concentration alkali cleaning, or they can be cleaned with water first followed by alkali cleaning, or vice versa, offering a variety of cleaning methods.

[0052] In some embodiments, please refer to Figure 2 Both the alkali supply pipeline 140b and the water supply pipeline 140a include a storage tank 143, a second power unit 141, and a supply valve 142 connected in series. The storage tank 143 in the alkali supply pipeline 140b is used to store alkali, and the storage tank 143 in the water supply pipeline 140a is used to store water. The second power unit 141, for example, is a power pump that provides the power for the flow of alkali and water. The supply valve 142 can open or close the corresponding pipeline.

[0053] In some embodiments, please refer to Figure 1 as well as Figure 2 The alkali recovery pipeline 160 includes an alkali recovery valve 162 and an alkali recovery tank 161 connected in series along the alkali flow direction. After the cleaning operation is completed, the alkali recovery valve 162 is opened, the alkali recovery pipeline 160 is connected, and under the power of the first power component 1211, the alkali in the acid tank 113 flows into the alkali recovery tank 161 for recovery.

[0054] All of the above-mentioned valves (electrically controlled valve 1113, reuse valve 1121, impurity removal valve 1212, direct discharge valve 131, supply valve 142, cleaning valve 1511, and alkali recovery valve 162) are electrically controlled valves 1113, which are electrically connected to the controller of the silicon steel pickling system 100. The opening conditions can be set as needed. For example, when the acid tank 113 contains alkali, the direct discharge valve 131 and the impurity removal valve 1212 cannot be opened to avoid accidental mixing of acid and alkali.

[0055] All of the aforementioned power components are also electrically connected to the control system to achieve interlocked control. The input end of the pipeline is located between the first and second components; essentially, this means that the input end of the pipeline connects to the pipeline between the first and second components. For example, the input end of the straight-through pipeline is located between the first power component 1211 and the impurity removal valve 1212, indicating that the input end of the straight-through pipeline connects to the pipeline between the first power component 1211 and the impurity removal valve 1212. Other similar expressions have the same meaning and will not be explained individually.

[0056] The working process of the silicon steel pickling system 100 of this application is described below.

[0057] Silicon steel pickling: Acid tank 113 contains acid solution. The pickling circulation loop 110 and the acid removal pipeline 121 are open. The acid solution in acid tank 113 flows into the pickling tank 114 through the acid supply pipeline 111 for pickling. Afterward, the acid solution flows back to acid tank 113 through the acid reuse pipeline 112 for recycling. At the same time, the impurity removal valve 1212 is opened, and the acid removal pipeline 121 is open. Under the action of the first power component 1211, the acid solution in acid tank 113 enters the mixing tank 1213 for flocculation. The silica sludge settles and sinks. The upper layer of liquid overflows through the outlet and flows into the acid precipitation tank 122 under gravity. The upper layer of acid solution in the acid precipitation tank 122 enters the acid tank 113 through the acid recovery pipeline 123, thus achieving the removal of impurities from the acid solution.

[0058] Pickling circulation loop 110 cleaning:

[0059] (1) Acid draining procedure for acid tank 113: Click the Start button, the impurity removal valve 1212 closes, the acid direct discharge valve 131 opens, and the acid direct discharge pipeline 130 is connected. The acid in acid tank 113 can only be quickly discharged into acid precipitation tank 122 through acid direct discharge pipeline 130 under the action of the first power unit 1211. When the outlet pressure of the first power unit 1211 is low, the operation stops. If the liquid level in acid precipitation tank 122 is lower than 5%, it is assumed to be empty.

[0060] (2) Water filling steps for acid tank 113: Enter the volume of water to be injected in the input box, click the Start button, the second power component 141 of the water supply pipeline 140a and the supply valve 142 are opened, and water enters the acid tank 113 through the water supply pipeline 140a. When the target value is reached by automatic volume calculation, the second power component 141 automatically stops running and the supply valve 142 is closed.

[0061] (3) Alkali injection procedure for acid tank 113: Input the desired volume of alkali solution to be injected, click the Start button, the second power unit 141 of the alkali solution supply pipeline 140b and the supply valve 142 will open, and the alkali solution will enter the acid tank 113 through the alkali solution supply pipeline 140b. When the alkali solution reaches the desired volume, the second power unit 141 will automatically stop running and the supply valve 142 will close.

[0062] (4) Alkaline washing procedure: Input the desired washing duration, click Start, the third power unit 1111 operates, the electric control valve 1113 and the reuse valve 1121 open, the acid supply pipeline 111 and the acid reuse pipeline 112 are respectively connected, and the alkaline solution in the acid tank 113 flows in the acid washing circulation loop 110. At the same time, the first power unit 1211 operates, the cleaning valve 1511 opens, and the cleaning loop 150 is connected. Under the action of the first power unit 1211, the alkaline solution in the acid tank 113 flows in the cleaning loop 150. During the flow of the alkaline solution, it reacts with the ferric silicate flakes to solve the blockage problem. According to the set temperature, the steam regulating valve 1112 automatically adjusts the valve opening to heat the alkaline solution with steam. After the washing time is reached, the alkaline washing automatically stops.

[0063] (5) Draining alkaline solution: Click the Start button, the first power unit 1211 starts running, the alkali recovery valve 162 opens, the alkali recovery pipeline 160 is connected, and the alkali in the acid tank 113 is discharged into the alkali recovery tank 161. After the injection volume is reached, the alkali recovery valve 162 automatically closes, and the first power unit 1211 stops.

[0064] (6) Water filling procedure for acid tank 113: Same as step (2).

[0065] (7) Water washing steps: Input the water washing time and water heating temperature, click Start, the third power unit 1111 runs, the electric control valve 1113 and the reuse valve 1121 open, the acid supply pipeline 111 and the acid reuse pipeline 112 are respectively connected, and the water in the acid tank 113 flows in the acid washing circulation loop 110. At the same time, the first power unit 1211 runs, the cleaning valve 1511 opens, the cleaning loop 150 is connected, and the water in the acid tank 113 flows in the cleaning loop 150 under the action of the first power unit 1211. According to the set temperature, the steam regulating valve 1112 automatically adjusts the valve opening to heat the water with steam. After the time is reached, the first power unit 1211 and the third power unit 1111 stop running, the drain valve of the acid tank 113 is opened to drain the water, and the entire cleaning is completed. The overall time is reduced by about 24 hours.

[0066] The silicon steel pickling system 100 provided in this application has at least the following advantages:

[0067] (1) The pipeline for discharging acid from acid tank 113 to acid precipitation tank 122 is optimized. When discharging acid, it is not necessary to pass through mixing tank 1213 and the overflow pipeline between mixing tank 1213 and precipitation tank. This increases the liquid flow rate between the first power component 1211 and acid precipitation tank 122, and is not limited by pipeline blockage.

[0068] (2) The optimization of the automatic alkaline cleaning process eliminated the need for rinsing with clean water before alkaline cleaning. An interlocking procedure between valves was designed to prevent accidental valve opening, enabling one-button automatic start for each step. This solved the problems of frequent manual valve operation on-site and computer-controlled valve and pump start / stop operations, reducing labor intensity and eliminating the safety risks and errors associated with valve operation. Through pipeline route modifications and the one-button automatic start / stop function for alkaline cleaning, the cleaning time was significantly reduced, creating valuable time for efficient production.

[0069] (3) All valves are automatically controlled. This alkaline cleaning method saves about 24 hours of alkaline cleaning time compared with the traditional alkaline cleaning method. It enables personnel to complete the alkaline cleaning work without leaving the operating room, reducing the labor intensity of personnel, and avoiding the malfunction caused by personnel manually opening and closing valves on site and in the picture.

[0070] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0072] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0074] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A silicon steel pickling system, characterized in that, This includes acid tanks, pickling tanks, acid supply pipelines, acid reuse pipelines, acid impurity removal pipelines, acid direct discharge pipelines, acid recovery pipelines, and acid precipitation tanks; Both ends of the acid supply pipeline and the acid reuse pipeline are connected to the acid tank and the pickling tank. The acid supply pipeline, the acid reuse pipeline, the acid tank and the pickling tank constitute an acid pickling circulation loop. The acid impurity removal pipeline includes a first power component arranged sequentially along the medium flow direction and a mixing tank for adding coagulant. The height of the mixing tank is higher than that of the acid precipitation tank. The overflow port of the mixing tank is connected to the acid precipitation tank. The two ends of the acid recovery pipeline are respectively connected to the acid tank and the acid precipitation tank. The acid tank, the acid impurity removal pipeline, the acid precipitation tank, and the acid recovery pipeline constitute an acid liquid recovery circuit. The input end of the acid direct discharge pipeline is connected to the acid impurity removal pipeline and is located between the first power unit and the mixing tank, while the output end of the acid direct discharge pipeline is connected to the acid precipitation tank.

2. The silicon steel pickling system according to claim 1, characterized in that, The acid direct discharge pipeline includes a vertical pipe section for inserting acid into the acid precipitation tank. The lower end of the vertical pipe section is closed, and an acid discharge hole is provided on the side.

3. The silicon steel pickling system according to claim 2, characterized in that, The acid drainage holes are provided in multiple locations, and the multiple acid drainage holes are distributed at intervals on the circumference of the vertical pipe section.

4. The silicon steel pickling system according to claim 2, characterized in that, The acid direct discharge pipeline also includes a direct discharge pipe section and a direct discharge valve installed on the direct discharge pipe section, and the direct discharge pipe section is connected to the input end of the vertical pipe section.

5. The silicon steel pickling system according to any one of claims 1-4, characterized in that, The acid removal pipeline includes a removal valve connected in series between the first power unit and the mixing tank, and the input end of the direct discharge pipeline is located between the first power unit and the removal valve.

6. The silicon steel pickling system according to claim 5, characterized in that, It also includes an alkali supply pipeline, a cleaning return pipeline, and an alkali recovery pipeline. The output end of the alkali supply pipeline is connected to the acid tank. The input end of the cleaning return pipeline is located between the first power unit and the impurity removal valve, and the output end is connected to the acid tank, so that the acid tank, the first power unit, and the cleaning return pipeline form a cleaning circuit. The input end of the alkali recovery pipeline is located between the first power unit and the impurity removal valve.

7. The silicon steel pickling system according to claim 6, characterized in that, It also includes a water supply pipeline, the output end of which is connected to the acid tank.

8. The silicon steel pickling system according to claim 7, characterized in that, Both the alkali supply pipeline and the water supply pipeline include a second power component and a supply valve connected in series.

9. The silicon steel pickling system according to any one of claims 1-4, characterized in that, The acid supply pipeline has two lines, which are connected in parallel.

10. The silicon steel pickling system according to claim 9, characterized in that, The acid supply pipeline includes a third power component, a steam regulating valve, and an electrically controlled valve connected in series.

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