Contaminated acid purification circulating system

Abstract

The utility model relates to a waste acid purification and circulation system. The waste acid purification circulating system comprises a second underflow pump which is arranged between the settling tank and the plate-and-frame filter press; the transfer tank is connected between the plate-and-frame filter press and the dilute acid desorption tower; and the blind plate is arranged on a communicating pipeline of the supernate tank and the dilute acid desorption tower and is used for cutting off the communication between the supernate tank and the dilute acid desorption tower. The second underflow pump is arranged to give full play to the maximum efficiency of the plate-and-frame filter press, and the transfer tank is arranged between the plate-and-frame filter press and the dilute acid desorption tower to receive and temporarily store waste acid after filter pressing and convey the waste acid into the dilute acid desorption tower for desorption treatment. When the plate-and-frame filter press works, the plate-and-frame filter press is in a cut-off state between the supernatant tank and the waste acid tank, and the plate-and-frame filter press and the transfer tank are in a communicated state, so that liquid in the supernatant tank is prevented from entering the dilute acid desorption tower, the acid mud content of the purified waste acid circulating system is improved, the blockage of the dilute acid desorption tower and a pipeline is reduced, and the service life of the plate-and-frame filter press is prolonged. Therefore, the desorption effect of the desorption tower is ensured.

Description

Technical Field

[0001] This application relates to the field of waste acid purification technology, and in particular to a waste acid purification and circulation system. Background Technology

[0002] See Figure 2 The traditional purification and circulation system for purifying waste acid at the sulfuric acid plant of Chuxiong Dianzhong Nonferrous Metals Co., Ltd. is as follows: The bottom of the waste acid settling tank 1 is connected to the input end of the plate and frame filter press 2 via two underflow pumps 8 and pipelines. The output end of the plate and frame filter press 2 is connected to the input ends of the supernatant tank 3 and the waste acid tank 5, respectively. At the same time, the upper part of the waste acid settling tank 1 is also connected to the input end of the supernatant tank 3 via pipelines. The output end of the supernatant tank 3 is connected to the input end of the dilute acid desorption tower 4 via pumps and pipelines. The output end of the dilute acid desorption tower 4 is connected to the input end of the waste acid tank 5. The output end of the waste acid tank 5 is connected to the waste acid treatment station 7 via a waste acid pump 6 and pipelines.

[0003] In this system, the supernatant overflowing from the acid settling tank 1 and the underflow from the acid settling tank 1 are fed into the plate and frame filter press 2 through two underflow pumps 8. The filtrate after being filtered by the plate and frame filter press 2 is collected into the supernatant tank 3, and then a branch is drawn from the supernatant tank 3 to the dilute acid desorption tower 4. After SO2 is removed, it enters the acid tank 5, and finally is fed into the acid treatment station 7 through the acid pump 6.

[0004] However, during actual use, the operators found that due to the limited processing capacity of the waste acid settling tank 1, the supernatant overflowing from the waste acid settling tank 1 contained some acid sludge. Therefore, when it was introduced into the dilute acid desorption tower 4, it easily caused the packing to become clogged, resulting in a decrease in the desorption effect of the dilute acid desorption tower 4. Utility Model Content

[0005] To address or partially address the problems existing in related technologies, this application provides a waste acid purification and circulation system.

[0006] To achieve the above objectives, this application employs the following technical solution:

[0007] A waste acid purification and circulation system includes a waste acid settling tank, a first underflow pump, a plate and frame filter press, a supernatant tank, a dilute acid desorption tower, a waste acid tank, a waste acid pump, and a waste acid treatment station. The waste acid purification and circulation system further includes:

[0008] The second underflow pump is located between the waste acid settling tank and the plate and frame filter press;

[0009] The transfer tank connects the plate and frame filter press and the dilute acid desorption tower;

[0010] A blind flange is installed on the connecting pipeline between the supernatant tank and the dilute acid desorption tower to cut off the connection between the two.

[0011] The plate and frame filter press is disconnected from the supernatant tank and the sludge acid tank, while the plate and frame filter press is connected to the transfer tank.

[0012] Optionally, a first input pipe is connected in parallel to the connecting pipe between the waste acid settling tank and the first underflow pump, and the other end of the first input pipe is connected to the input end of the second underflow pump.

[0013] Optionally, the output end of the second underflow pump is connected to the input end of the plate and frame filter press via the first output pipe.

[0014] Optionally, a second input pipe is connected in parallel to the connecting pipeline between the plate and frame filter press and the supernatant tank, and the other end of the second input pipe is connected to the input end of the transfer tank.

[0015] Optionally, the output end of the transfer tank is connected to one end of a second output pipe, and the other end of the second output pipe is connected in parallel to the connecting pipeline between the supernatant tank and the dilute acid desorption tower, and is located at the rear end of the blind plate.

[0016] Optionally, a delivery pump is provided on the second output pipe.

[0017] The beneficial effects of this application are as follows: In traditional purification circulation systems, two underflow pumps are installed, which can only basically meet the filtration needs of the discharged waste acid, leaving no capacity for filtering and purifying the system's dilute acid. Therefore, in this application, a second underflow pump with a larger flow rate and head is added between the settling tank and the plate and frame filter press to increase the amount of dilute acid passing through the filter press, fully utilizing the efficiency of the plate and frame filter press. A transfer tank is set between the plate and frame filter press and the dilute acid desorption tower to receive and temporarily store the filtered waste acid, which is then transported to the dilute acid desorption tower for desorption treatment. Simultaneously, a blind flange is installed on the connecting pipeline between the supernatant tank and the dilute acid desorption tower to disconnect the connection between the two. During plate and frame filter press operation, the connection between the plate and frame filter press and the supernatant tank and the waste acid tank is cut off, while the plate and frame filter press is connected to the transfer tank. This prevents the liquid in the supernatant tank from entering the dilute acid desorption tower, thereby improving the quality of the waste acid raw liquid discharged to the sewage treatment plant, improving the acid sludge content in the purified waste acid circulation system, reducing blockage of the dilute acid desorption tower and pipelines, and thus ensuring the desorption effect of the desorption tower.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0020] Figure 1This is a schematic diagram of the waste acid purification and circulation system shown in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a traditional waste acid purification and circulation system in the background technology.

[0022] Attached reference numerals: 1. Sludge settling tank; 2. Plate and frame filter press; 3. Supernatant tank; 4. Dilute acid desorption tower; 5. Sludge tank; 6. Sludge pump; 7. Sludge treatment station; 8. First underflow pump; 9. Second underflow pump; 10. Transfer tank; 11. Blind plate; 12. First input pipe; 13. First output pipe; 14. Second input pipe; 15. Second output pipe; 16. Transfer pump. Detailed Implementation

[0023] 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", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application as appropriate to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0029] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0030] To make the objectives, technical solutions, and beneficial effects of this application clearer, the preferred embodiments of this application will be described in detail below with reference to the accompanying drawings, so as to facilitate understanding by those skilled in the art.

[0031] Example 1:

[0032] See Figure 1 A waste acid purification and circulation system includes a waste acid settling tank 1, a first underflow pump 8, a plate and frame filter press 2, a supernatant tank 3, a dilute acid desorption tower 4, a waste acid tank 5, a waste acid pump 6, and a waste acid treatment station 7. The waste acid purification and circulation system further includes:

[0033] The second underflow pump 9 is located between the waste acid settling tank 1 and the plate and frame filter press 2;

[0034] The intermediate transfer tank 10 is connected between the plate and frame filter press 2 and the dilute acid desorption tower 4;

[0035] Blind flange 11 is installed on the connecting pipeline between supernatant tank 3 and dilute acid desorption tower 4 to cut off the connection between the two.

[0036] The plate and frame filter press 2 is disconnected from the supernatant tank 3 and the sludge tank 5, while the plate and frame filter press 2 is connected to the transfer tank 10.

[0037] Specifically, the waste acid settling tank 1 uses gravity settling to allow suspended solid particles in the waste acid to settle naturally, forming a supernatant (liquid containing low-concentration pollutants) and underflow sludge (high-concentration solids), thus reducing the load on subsequent treatment. Two first underflow pumps 8 are installed to transport the underflow from the waste acid settling tank 1 to the plate and frame filter press 2. The plate and frame filter press 2 converts the underflow into a low-moisture sludge cake and a low-solids filtrate through plate and frame compression and filter cloth interception. The supernatant tank 3 is used to store the sedimentation products formed in the waste acid settling tank 1. The supernatant; the dilute acid desorption tower 4, by blowing air (or using negative pressure), allows the acid liquid to fully contact with the air in the packing layer, and removes SO2 gas from the dilute acid through desorption (the removal rate can reach more than 96%); the waste acid tank 5 centrally stores acidic waste liquid (waste acid) containing pollutants, providing a buffer for subsequent unified treatment and facilitating centralized management of pollutants; the waste acid pump 6 transports the waste acid centrally stored in the waste acid tank 5 to the waste acid treatment station 7, realizing the reduction of harm, compliance with standards, and reuse of waste acid through a systematic process.

[0038] In traditional purification and circulation systems, two underflow pumps 8 are installed, which can only basically meet the filtration needs of the discharged waste acid, leaving no capacity for filtering and purifying the system's dilute acid. Therefore, in this application, a second underflow pump 9 with a larger flow rate and head is added between the waste acid settling tank 1 and the plate and frame filter press 2 to increase the amount of dilute acid passing through the filter press, fully utilizing the efficiency of the plate and frame filter press 2. A transfer tank 10 is set between the plate and frame filter press 2 and the dilute acid desorption tower 4 to receive and temporarily store the filtered waste acid before transporting it to the dilute acid desorption tower 4 for desorption treatment. At the same time, a blind flange 11 is installed on the connecting pipeline between the supernatant tank 3 and the dilute acid desorption tower 4 to cut off the connection between the two. When the plate and frame filter press 2 is in operation, the connection between the plate and frame filter press 2 and the supernatant tank 3 and the waste acid tank 5 is cut off, while the plate and frame filter press 2 and the transfer tank 10 are connected. This prevents the liquid in the supernatant tank 3 from entering the dilute acid desorption tower 4, thereby improving the quality of the waste acid raw liquid discharged to the waste acid treatment station 7, improving the acid sludge content in the purified waste acid circulation system, reducing the blockage of the dilute acid desorption tower 4 and the pipeline, and thus ensuring the desorption effect of the dilute acid desorption tower 4.

[0039] It should be noted that the shut-off of each pipeline in the system is achieved through valves. The valves and their installation methods are conventional technical means and will not be described in detail here.

[0040] Example 2:

[0041] See Figure 1 Based on Embodiment 1, optionally, a first input pipe 12 is connected in parallel on the connecting pipe between the waste acid settling tank 1 and the first underflow pump 8, and the other end of the first input pipe 12 is connected to the input end of the second underflow pump 9.

[0042] Specifically, the waste acid settling tank 1 is connected to the second underflow pump 9 through the first input pipe 12, so that when the second underflow pump 9 is activated, the underflow of waste acid settling tank 1 is driven into the second underflow pump 9.

[0043] Optionally, the output end of the second underflow pump 9 is connected to the input end of the plate and frame filter press 2 via the first output pipe 13.

[0044] Specifically, the second underflow pump 9 is connected to the plate and frame filter press 2 through the first output pipe 13, so that when the second underflow pump 9 is activated, it drives the underflow of the sludge settling tank 1 to the plate and frame filter press 2.

[0045] Optionally, a second input pipe 14 is connected in parallel on the connecting pipe between the plate and frame filter press 2 and the supernatant tank 3, and the other end of the second input pipe 14 is connected to the input end of the transfer tank 10.

[0046] Specifically, the plate and frame filter press 2 is connected to the transfer tank 10 through the second input pipe 14, so that the filtered liquid enters the transfer tank 10 for temporary storage.

[0047] Optionally, the output end of the transfer tank 10 is connected to one end of the second output pipe 15, and the other end of the second output pipe 15 is connected in parallel to the connecting pipeline between the supernatant tank 3 and the dilute acid desorption tower 4, and is located at the rear end of the blind plate 11.

[0048] Specifically, the transfer tank 10 and the dilute acid desorption tower 4 are connected through the second output pipe 15 so that the filtered liquid is input into the dilute acid desorption tower 4 for desorption treatment. At the same time, the second output pipe 15 is located at the rear end of the blind plate 11 to avoid the blind plate 11 from affecting it.

[0049] Optionally, a delivery pump 16 is provided on the second output pipe 15.

[0050] Specifically, the transfer pump 16 overcomes pipeline resistance, maintains liquid flow, and improves liquid transfer efficiency.

[0051] It should be noted that the structures and / or installation methods not detailed in this application are those that can be known by those skilled in the art in combination with common knowledge and / or prior art, and are not the focus of this application, and will not be elaborated further here.

[0052] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this application; the dimensions of the drawings are not related to the specific physical object, and the physical object dimensions can be arbitrarily changed.

Claims

1. A waste acid purification and circulation system, comprising a waste acid settling tank (1), a first underflow pump (8), a plate and frame filter press (2), a supernatant tank (3), a dilute acid desorption tower (4), a waste acid tank (5), a waste acid pump (6), and a waste acid treatment station (7), characterized in that, The aforementioned waste acid purification and circulation system also includes: The second underflow pump (9) is located between the waste acid settling tank (1) and the plate and frame filter press (2); The transfer tank (10) is connected between the plate and frame filter press (2) and the dilute acid desorption tower (4); A blind flange (11) is installed on the connecting pipeline between the supernatant tank (3) and the dilute acid desorption tower (4) to cut off the connection between the two. Among them, the plate and frame filter press (2) is cut off from the supernatant tank (3) and the sludge tank (5), while the plate and frame filter press (2) is connected to the transfer tank (10).

2. The waste acid purification and circulation system as described in claim 1, characterized in that, The waste acid settling tank (1) and the first underflow pump (8) are connected in parallel with one end of the first input pipe (12), and the other end of the first input pipe (12) is connected to the input end of the second underflow pump (9).

3. The waste acid purification and circulation system as described in claim 2, characterized in that, The output end of the second underflow pump (9) is connected to the input end of the plate and frame filter press (2) through the first output pipe (13).

4. The waste acid purification and circulation system as described in claim 1, characterized in that, The plate and frame filter press (2) and the supernatant tank (3) are connected in parallel with one end of a second input pipe (14), and the other end of the second input pipe (14) is connected to the input end of the transfer tank (10).

5. The waste acid purification and circulation system as described in claim 4, characterized in that, The output end of the transfer tank (10) is connected to one end of the second output pipe (15), and the other end of the second output pipe (15) is connected in parallel to the connecting pipeline of the supernatant tank (3) and the dilute acid desorption tower (4), and is located at the rear end of the blind plate (11).

6. The waste acid purification and circulation system as described in claim 5, characterized in that, The second output pipe (15) is equipped with a delivery pump (16).

Images