Waste acid recycling process device

Abstract

The utility model provides a waste acid recycling process device, which relates to the technical field of acid pickling process waste acid treatment and comprises an acid regulating tank, an acid pickling tank, a filter tank, a backwashing acid liquor tank and a backwashing liquor collecting tank according to treatment steps. The acid pickling tank is used for accumulating the waste acid subjected to pH value treatment and transferring the waste acid into the filtering tank, the acid pickling tank is further used for receiving layered supernatant liquid in the backwashing liquid collecting tank, and by arranging the backwashing acid liquid tank and the backwashing liquid collecting tank, the pH value of the waste acid can be adjusted in the acid adjusting tank and the acid pickling tank; and the filter tank is arranged to filter the waste acid and supplement liquid to the backwashing acid liquid tank and the backwashing liquid collecting tank without adding chemical agents, so that the operation cost is saved, high operation cost is not generated, no waste acid is discharged, and no secondary pollution is generated.

Description

Technical Field

[0001] The utility model relates to the technical field of waste acid treatment in pickling processes, in particular to a waste acid recovery and utilization process device. Background Art

[0002] The existing steel industry, metal product processing industry, electronics manufacturing industry, automobile manufacturing industry, stainless steel manufacturing industry, electroplating industry, metallurgy industry, fuel cell manufacturing industry, etc. all use pickling process to remove surface oxides, rust, grease and other impurities to improve the quality and corrosion resistance of steel and provide a clean and smooth surface. When the concentration of sulfuric acid or hydrochloric acid in the acid pool is reduced or the concentration of organic matter is too high, it will affect the quality of the entire pickled workpiece. Usually, the acid in the pickling pool should be replaced at this time.

[0003] The acid solution discharged from the replacement plant is highly acidic and contains high levels of organic impurities. Conventional treatment involves neutralization, adding large amounts of sodium hydroxide to reduce the pH of the waste acid to 6-8 before discharging it to a wastewater treatment station. This process, combined with factory wastewater and treated to meet standards, results in high operating costs, consumes significant amounts of sodium hydroxide, and generates secondary pollutants. Conventional recycling processes are prone to corrosion, clogging, and difficulty in recovery, often leading to the scrapping of the recovery system. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art and to propose a waste acid recovery and utilization process device.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a waste acid recovery and utilization process device, which includes an acid regulating tank, a pickling tank, a filter tank, a backwash acid liquid tank and a backwash liquid collection box according to the processing steps. The acid regulating tank is used to adjust the pH value of the waste acid and transport it to the pickling tank. The pickling tank is used to accumulate the waste acid after pH treatment and transfer it to the filter tank. The pickling tank is also used to receive the upper clear liquid after stratification in the backwash liquid collection box. The built-in component of the filter tank is used to filter impurities in the waste acid and discharge the qualified waste acid after filtration along the discharge port. The backwash acid liquid tank has one function of backwashing the filter element in the filter tank, and its second function is to assist the acid regulating tank in adjusting the pH value of the raw waste acid. The backwash liquid collection box is used to collect the liquid for flushing the filter element in the filter tank and transfer the collected liquid to the pickling tank.

[0006] Preferably, a delivery pump is provided at the bottom drain outlet of the acid regulating tank, and the water outlet of the delivery pump is connected to the water inlet of the pickling tank through a pipeline.

[0007] Preferably, the water outlet of the pickling tank is provided with a waste acid pump, the water outlet of the waste acid pump is also connected to the water inlet of the filter tank through a pipeline, and the water outlet pipeline of the waste acid pump is built-in with a switch valve.

[0008] Preferably, the backwash liquid collecting tank is provided with a supernatant backflow pump at the water outlet, the water outlet of the supernatant backflow pump is connected with the water inlet of the pickling tank through a pipeline, and a supernatant backflow valve is arranged in the pipeline of the water outlet of the supernatant backflow pump; the water inlet of the pickling tank is provided with a tee pipe, and the three ports of the tee pipe are respectively connected with the pickling tank, the outlet pipeline of the delivery pump and the valve port of the supernatant backflow valve.

[0009] Preferably, the water outlet of the filter tank is connected with a connecting pipe, the connecting pipe is connected with the water inlet end of the backwash acid liquid tank and is provided with a produced liquid inlet backwash tank valve, a temperature table and a flow table are arranged in the connecting pipe, a backwash liquid inlet valve is arranged through the surface of the connecting pipe, the other port of the backwash liquid inlet valve is connected with the drain of the backwash acid liquid tank through a pipeline, and a produced liquid inlet adjusting tank valve is also arranged through the surface of the connecting pipe, and the other port of the produced liquid inlet adjusting tank valve is connected with the top end of the acid adjusting tank through a pipeline.

[0010] Preferably, the water inlet of the backwash liquid collecting tank is connected with a cross-flow valve through a pipeline, the cross-flow valve extends to and is in communication with the connecting pipe near the drain of the filter tank, the drain of the backwash liquid collecting tank is provided with a backwash pump, and the water outlet end of the backwash pump is connected with the other port of the backwash liquid inlet valve through a pipeline.

[0011] Preferably, the drain of the backwash liquid collecting tank is provided with a residue discharging pump, a residue discharging pipe is arranged at the residue discharging port of the residue discharging pump, and the residue discharging pipe is used for compressed liquid treatment.

[0012] Compared with the prior art, the utility model has the advantages and positive effects that,

[0013] 1. In the utility model, the backwash acid liquid tank and the backwash liquid collecting tank can respectively add the acid-base degree of the adjusted waste acid into the acid adjusting tank and the pickling tank, the filter tank can filter the waste acid and supplement the liquid to the backwash acid liquid tank and the backwash liquid collecting tank, no chemical reagent needs to be added, the operation cost is saved, no high operation cost is generated, no waste acid is discharged, and no secondary pollution is generated.

[0014] 2. In the utility model, the backwash pump is arranged, the backwash liquid inlet valve is utilized to realize the reverse flushing of the filter element in the filter tank under the condition that the filter surface of the filter element is clean, and the risk of pollution and blockage of the filter element in the filter tank is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A three-dimensional structure schematic view of a waste acid recycling process device is provided for the utility model;

[0016] Figure 2 A Figure 1 enlarged view of position A in Fig.

[0017] Figure 3 A Figure 1 Enlarged view at B;

[0018] Figure 4 As Figure 1 Enlarged view at C;

[0019] Figure 5 As Figure 1 Enlarged view at D.

[0020] Legend: 1, acid adjustment tank; 2, pickling tank; 3, filter tank; 4, backwash acid tank; 5, backwash liquid collection tank; 6, delivery pump; 7, three-way pipe; 8, supernatant backflow pump; 9, supernatant backflow valve; 10, waste acid pump; 11, on-off valve; 12, connecting pipe; 13, temperature gauge; 14, flow meter; 15, backwash pump; 16, backwash inlet valve; 17, produced liquid inlet adjustment tank valve; 18, deslagging pump; 19, cross-flow valve; 20, deslagging pipe; 21, produced liquid inlet backwash tank valve. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above objectives, features and advantages of the present application, the present application will be further described below in conjunction with the accompanying drawings and examples. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed in the following description.

[0023] As Figure 1-5 shown, the waste acid recycling process device, according to the processing steps, includes an acid adjustment tank 1, a pickling tank 2, a filter tank 3, a backwash acid tank 4 and a backwash liquid collection tank 5 The acid adjustment tank 1 is used to adjust the pH value of the waste acid and deliver it to the pickling tank 2, the pickling tank 2 is used to deliver the waste acid after the pH value is treated and pass it to the filter tank 3, and the pickling tank 2 is also used to receive the supernatant after the backwash liquid collection tank 5 is layered, the filter tank 3 is built-in component for filtering impurities in waste acid and discharging qualified waste acid after filtration along the discharge port, the backwash acid tank 4 has two functions, one is to backwash the filter element in the filter tank 3, the other is to assist the acid adjustment tank 1 to adjust the pH value of the raw material waste acid, the backwash liquid collection tank 5 is used to collect the liquid for flushing the filter element in the filter tank 3 and deliver the collected liquid to the pickling tank 2, the filter element uses inorganic ceramic aluminum oxide / silicon carbide as the filter carrier, which has the advantages of durability, pressure resistance, strong acid and strong alkali resistance, high filtration precision of 10-500nm, strong anti-pollution and easy cleaning and recovery.

[0024] Specifically: a delivery pump 6 is provided at the bottom drain outlet of the acid regulating tank 1, and the outlet of the delivery pump 6 is connected to the water inlet of the pickling tank 2 through a pipe. When the pH value of the waste acid in the acid regulating tank 1 is adjusted to an appropriate value, the delivery pump 6 is used to deliver the adjusted waste acid to the pickling tank 2. A waste acid pump 10 is provided at the outlet of the pickling tank 2, and the outlet of the waste acid pump 10 is also connected to the water inlet of the filter tank 3 through a pipe, and a switch valve 11 is built into the outlet pipe of the waste acid pump 10. After the pH value of the waste acid in the pickling tank 2 is further adjusted, the switch valve 11 and the production liquid inlet backwash box valve 21 are opened, so that the waste acid in the pickling tank 2 is delivered to the filter tank 3 under the action of the waste acid pump 10, and after filtration by the filter element in the filter tank 3, it enters the backwash liquid collection tank 5 through the production liquid inlet backwash box valve 21 for collection.

[0025] Specifically: a supernatant liquid reflux pump 8 is installed at the water outlet of the backwash liquid collecting box 5, the water outlet of the supernatant liquid reflux pump 8 is connected to the water inlet of the pickling tank 2 through a pipe, and a supernatant liquid reflux valve 9 is built into the pipe of the water outlet of the supernatant liquid reflux pump 8, and a tee pipe 7 is installed at the water inlet of the pickling tank 2. The three ports of the tee pipe 7 are respectively connected to the pickling tank 2, the water outlet pipe of the delivery pump 6 and the valve port of one end of the supernatant liquid reflux valve 9. When the liquid level in the backwash liquid collecting box 5 is high, the supernatant liquid reflux valve 9 is opened, and the supernatant liquid reflux pump 8 is used to extract the upper supernatant liquid in the backwash liquid collecting box 5 through the tee pipe 7 into the pickling tank 2 for further adjusting the pH value of the waste acid in the pickling tank 2.

[0026] Specifically: the water outlet of the filter pool 3 is connected to the connecting pipe 12, the connecting pipe 12 is connected to the water inlet end of the backwash acid tank 4 and has a built-in production liquid inlet backwash tank valve 21, the connecting pipe 12 has a built-in temperature meter 13 and a flow meter 14, and a backwash liquid inlet valve 16 is installed through the surface of the connecting pipe 12, and the other end of the backwash liquid inlet valve 16 is connected to the drain outlet of the backwash acid tank 4 through a pipeline, and a production liquid inlet regulating box valve 17 is also installed through the surface of the connecting pipe 12, and the other gate of the production liquid inlet regulating box valve 17 is connected to the top of the acid regulating tank 1 through a pipeline. The liquid filtered by the filter element is calculated in real time by the set temperature meter 13 and flow meter 14 before passing through the production liquid inlet backwash tank valve 21 and entering the backwash acid tank 4. When the temperature drops or the flow drops, it indicates that the surface of the filter element in the filter pool 3 is seriously clogged, the system will shut down for protection, and send a message reminder to a specific administrator to ensure the safe operation of the system.

[0027] Specifically: The water inlet of the backwash liquid collection box 5 is connected to a cross-flow valve 19 through a pipeline. The cross-flow valve 19 extends to its port and is connected to the connecting pipe 12 near the drain outlet of the filter tank 3. It can ensure that a part of the produced liquid filtered by the filter element is collected in the backwash liquid collection box 5, and the liquid in the backwash liquid collection box 5 is replenished in time to ensure that the acid washing tank 2 can further adjust the pH value of the waste acid smoothly. The backwash liquid collection box 5 is equipped with a backwash pump 15 at the drain outlet. The water outlet of the backwash pump 15 is connected to the other end of the backwash liquid inlet valve 16 through a pipeline. When the filter cotton of the filter element is detected to be clogged, the produced liquid enters the backwash box valve 21 Close and open the backwash liquid inlet valve 16, and then use the backwash pump 15 to pour the filtered liquid collected in the backwash liquid collection box 5 into the drain outlet of the filter pool 3 to achieve backwashing of the filter elements in the filter pool 3. A slag discharge pump 18 is installed at the drain outlet of the backwash liquid collection box 5, and a slag discharge pipe 20 is installed at the slag outlet of the slag discharge pump 18, and the slag discharge treatment is carried out by compression and liquid removal through the slag discharge pipe 20. A common compression dehydrator is connected to the slag discharge pipe 20, and the waste slag deposited at the bottom of the backwash liquid collection box 5 is sent into the compression dehydrator along the slag discharge pipe 20 for dehydration by the slag discharge pump 18, and the removed acid returns to the pickling tank 2 or the acid regulating tank 1.

[0028] The system operates as follows: When the acidity of the waste acid in pickling tank 2 drops below the lower limit required by the pickling process, the system automatically activates, the backwash valve 21 opens, and the waste acid pump 10 starts. The waste acid is pumped from pickling tank 2 to filter tank 3, where it is filtered through the filter elements. The temperature and flow rates are monitored by thermometer 13 and flowmeter 14. If any operating value in the system exceeds the set protection value, the system shuts down for protection and sends a message to a specific administrator to ensure safe operation. When the filter element operating pressure differential reaches the set value or the cumulative operating time reaches the set value, the system directly stops operating mode and activates backwash mode. Backwash inlet valve 16 opens and backwash pump 15 starts. After the backwash process is completed, the system switches directly to normal operating mode. The discharged waste liquid enters waste liquid collection tank 5. After sedimentation, the system opens supernatant return valve 9, allowing the supernatant to flow into pickling tank 2. The sediment is compressed and deliquified separately, and the acid removed from the sediment is returned to pickling tank 2 or acid conditioning tank 1.

[0029] The delivery pump 6, supernatant reflux pump 8, waste acid pump 10, backwash pump 15 and slag discharge pump 18 in the present invention can use the common high-temperature acid pumps on the market, and the supernatant reflux valve 9, switch valve 11, backwash inlet valve 16, liquid production inlet regulating box valve 17, cross-flow valve 19 and liquid production inlet backwash box valve 21 can choose the common D341F46 flange-lined fluorine butterfly valve on the market, and the pipes and connecting pipes 12 connecting various pumps are made of high-quality acid-resistant materials, and the connection method is basically welding to prevent the occurrence of Pressure leakage, and the wiring diagram of the high-temperature acid pump and the D341F46 flange-lined fluorine butterfly valve belongs to common knowledge in this field. Its working principle is a well-known technology. Its model is selected according to the actual use. Therefore, the control method and wiring arrangement of the delivery pump 6, the supernatant reflux pump 8, the waste acid pump 10, the backwash pump 15, the slag pump 18, the supernatant reflux valve 9, the switch valve 11, the backwash liquid inlet valve 16, the produced liquid inlet regulating box valve 17, the cross-flow valve 19, and the produced liquid inlet backwash box valve 21 are no longer explained in detail.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A waste acid recovery and utilization process device, characterized in that: According to the treatment steps, the process comprises an acid regulating tank (1), a pickling tank (2), a filter tank (3), a backwash acid tank (4) and a backwash liquid collecting tank (5). The acid regulating tank (1) is used to adjust the pH value of the waste acid and transport it to the pickling tank (2). The pickling tank (2) is used to stack the waste acid after pH treatment and transfer it to the filter tank (3). The pickling tank (2) is also used to receive the upper clear liquid after stratification in the backwash liquid collecting tank (5). The built-in components of the filter tank (3) are used to filter impurities in the waste acid and discharge the qualified waste acid after filtration along the discharge port. The backwash acid tank (4) has one function of backwashing the filter element in the filter tank (3) and another function of assisting the acid regulating tank (1) in regulating the pH value of the raw waste acid. The backwash liquid collecting tank (5) is used to collect the liquid used to wash the filter element in the filter tank (3) and transfer the collected liquid to the pickling tank (2).

2. The waste acid recovery and utilization process device according to claim 1, characterized in that: A delivery pump (6) is provided at the bottom drain port of the acid regulating tank (1), and the water outlet of the delivery pump (6) is connected to the water inlet of the pickling tank (2) through a pipeline.

3. The waste acid recovery and utilization process device according to claim 1, characterized in that: The water outlet of the pickling tank (2) is provided with a waste acid pump (10), and the water outlet of the waste acid pump (10) is also connected to the water inlet of the filter tank (3) through a pipeline, and a switch valve (11) is built into the water outlet pipeline of the waste acid pump (10).

4. The waste acid recovery and utilization process device according to claim 1, characterized in that: A supernatant liquid reflux pump (8) is installed at the water outlet of the backwash liquid collecting box (5), the water outlet of the supernatant liquid reflux pump (8) is connected to the water inlet of the pickling tank (2) through a pipeline, and a supernatant liquid reflux valve (9) is built into the pipeline of the water outlet of the supernatant liquid reflux pump (8), and a three-way pipe (7) is installed at the water inlet of the pickling tank (2), and the three ports of the three-way pipe (7) are respectively connected to the pickling tank (2), the water outlet pipeline of the delivery pump (6) and the valve port of one end of the supernatant liquid reflux valve (9).

5. The waste acid recovery and utilization process device according to claim 1, characterized in that: The water outlet of the filter tank (3) is connected to a connecting pipe (12), the connecting pipe (12) is connected to the water inlet end of the backwash acid tank (4) and has a built-in production liquid inlet backwash tank valve (21), the connecting pipe (12) has a built-in temperature meter (13) and a flow meter (14), a backwash liquid inlet valve (16) is installed through the surface of the connecting pipe (12), the other end of the backwash liquid inlet valve (16) is connected to the drain outlet of the backwash acid tank (4) through a pipeline, and a production liquid inlet regulating tank valve (17) is also installed through the surface of the connecting pipe (12), and the other end of the production liquid inlet regulating tank valve (17) is connected to the top of the acid regulating tank (1) through a pipeline.

6. The waste acid recovery and utilization process device according to claim 1, characterized in that: The water inlet of the backwash liquid collection box (5) is connected to a cross-flow valve (19) through a pipeline. The cross-flow valve (19) extends to a point where its port is connected to the connecting pipe (12) near the drainage outlet of the filter tank (3). A backwash pump (15) is installed at the drainage outlet of the backwash liquid collection box (5). The water outlet of the backwash pump (15) is connected to the other port of the backwash inlet valve (16) through a pipeline.

7. The waste acid recovery and utilization process device according to claim 6, characterized in that: The backwash liquid collecting box (5) is provided with a slag discharge pump (18) at its drainage outlet, and a slag discharge pipe (20) is provided at its slag discharge outlet, and compression and liquid removal are performed through the slag discharge pipe (20).

Images