Wastewater treatment device for silicon steel production system

Abstract

The utility model discloses a wastewater treatment device for a silicon steel production system. The wastewater treatment device comprises a flocculation basin; the middle tank is communicated with the flocculation tank, and an overflow port is formed in the side wall of the middle tank; the sedimentation tank is communicated with the overflow port and is provided with a sedimentation outlet and a clear liquid outlet; the collecting tank is communicated with the clear liquid outlet and is communicated with the settling tank through a circulating pump; the filter press is provided with a feed port, a water outlet and a waste discharge port, the feed port is communicated with the sedimentation outlet, the water outlet is communicated with the sedimentation tank, and the waste discharge port is communicated with the outside. According to the wastewater treatment device for the silicon steel production system, after flocculation treatment is carried out through the flocculation basin, solid-liquid separation is carried out through the sedimentation basin, and discharged high-concentration magnesium oxide sludge is subjected to filter pressing forming, so that the flow control requirement is reduced, high-concentration sludge can be subjected to filter pressing without arranging a plurality of filter presses, the occupied area is reduced, and the cost is reduced. Meanwhile, blockage is avoided, and efficient and continuous wastewater treatment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon steel production wastewater treatment, in particular to a wastewater treatment device used in a silicon steel production system. Background Art

[0002] After decarburization annealing in a continuous furnace, magnesium oxide powder or magnesium oxide coating needs to be evenly coated on the upper and lower surfaces of the silicon steel. Magnesium oxide mainly acts as an isolation agent to prevent the steel strip from sticking during the high-temperature annealing stage. At the same time, it can also form an organic film on the surface of the steel, thereby improving the surface quality of the silicon steel while ensuring the magnetic conductivity of the steel.

[0003] After using magnesium oxide to treat silicon steel surface, wastewater containing magnesium oxide is usually produced. In order to avoid magnesium oxide wastewater from polluting the environment, it is necessary to treat it to meet the discharge standards before discharging it. Figure 1 As shown, it includes a collecting tank, a centrifugal pump and a filter press connected in sequence. The collecting tank is used to collect wastewater discharged from the silicon steel production system. The centrifugal pump is used to introduce the wastewater collected in the collecting tank into the filter press. The filter press realizes solid-liquid separation through filtration.

[0004] However, in the above-mentioned wastewater treatment device, the flow control requirements for magnesium oxide wastewater are relatively high. During actual use, it is necessary to ensure that the flow rate at the input end of the collection tank is lower than or equal to the flow rate at the input end of the filter press. During the filter pressure treatment, due to the low concentration of magnesium oxide in the wastewater, not only are multiple filter presses required to work simultaneously, increasing the floor space and power consumption of wastewater treatment, but also during the treatment process, the waste sludge is not easy to form, which is easy to cause blockage, affecting the wastewater treatment efficiency.

[0005] Therefore, it is necessary to improve the magnesium oxide wastewater treatment device for silicon steel production in the prior art. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects in the prior art and provide a wastewater treatment device for a silicon steel production system which reduces flow control requirements, reduces floor space, reduces power consumption and avoids blockage to ensure treatment efficiency.

[0007] In order to achieve the above technical effects, the technical solution of the utility model is: a wastewater treatment device for a silicon steel production system, comprising:

[0008] A flocculation tank, wherein the flocculation tank is used to receive wastewater discharged from a silicon steel production system;

[0009] An intermediate tank, the intermediate tank is connected to the flocculation tank, and an overflow port is arranged on the side wall of the intermediate tank;

[0010] A sedimentation tank, the sedimentation tank is connected to the overflow port, and a sedimentation outlet and a clear liquid outlet are respectively provided on the bottom and side wall of the sedimentation tank;

[0011] A collecting tank, the collecting tank is connected to the clear liquid outlet, and the collecting tank is connected to the settling tank through a circulating pump;

[0012] A filter press is provided with a feed port, a drain port and a waste discharge port, the feed port is connected with the sedimentation outlet, the drain port is connected with the sedimentation tank, and the waste discharge port is connected with the outside.

[0013] Preferably, in order to guide the flow direction of wastewater and stabilize the flow, a guide tube extending in a vertical direction is provided in the intermediate pool, the top of the guide tube is connected to the flocculation pool, and the bottom of the guide tube is spaced from the inner bottom wall of the intermediate pool.

[0014] Preferably, in order to promote the mixing and contact between the solid particles in the wastewater and the flocculant, the flocculation tank is connected to a stirring device to accelerate the mixing and contact between the suspended particles in the wastewater and the flocculant.

[0015] Preferably, in order to ensure flocculation efficiency, the stirring device includes a pneumatic stirrer.

[0016] Preferably, in order to improve the sedimentation effect, the sedimentation tank includes a primary sedimentation tank and a secondary sedimentation tank connected in sequence along the flow direction of the wastewater, and the bottom of the primary sedimentation tank and the bottom of the secondary sedimentation tank are both provided with sedimentation outlets, the primary sedimentation tank is connected to the overflow port, and the clear liquid outlet is arranged on the secondary sedimentation tank.

[0017] Preferably, in order to achieve buffering and facilitate sludge sedimentation, a sludge pool is provided between the sedimentation tank and the filter press, and the sludge pool is connected to the feed port and the sedimentation outlet.

[0018] Preferably, in order to achieve stable transmission of sludge, the sludge tank is connected to the feed port via a plunger pump.

[0019] Preferably, in order to facilitate the discharge of wastewater, the output end of the circulation pump is connected to the sedimentation tank through a first valve group, and is connected to the outside through a second valve group.

[0020] In summary, compared with the prior art, the wastewater treatment device for silicon steel production system of the utility model performs flocculation treatment in a flocculation tank, uses a sedimentation tank for solid-liquid separation, and filters the discharged high-concentration magnesium oxide sludge for forming. This not only reduces the flow control requirements, but also does not require the installation of multiple filter presses to filter the high-concentration sludge, thereby reducing floor space and power consumption, while avoiding blockage and ensuring efficient and continuous wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the prior art;

[0022] Figure 2 It is a structural schematic diagram of the utility model;

[0023] In the figure: 1. flocculation tank; 11. pneumatic agitator; 12. feed pump; 2. intermediate tank; 21. overflow port; 22. guide tube; 3. sedimentation tank; 31. primary sedimentation tank; 32. secondary sedimentation tank; 33. sedimentation outlet; 34. clear liquid outlet; 4. collection tank; 5. circulation pump; 51. first valve group; 52. second valve group; 6. filter press; 61. feed port; 62. drain port; 63. waste outlet; 7. sludge tank; 8. plunger pump; 9. centrifugal pump. DETAILED DESCRIPTION

[0024] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0025] like Figure 1 As shown, it is a treatment device for magnesium oxide wastewater generated in the silicon steel production system in the prior art, including a collection tank 4, a centrifugal pump 9 and a filter press 6 connected in sequence, the collection tank 4 is used to collect magnesium oxide wastewater (hereinafter referred to as "wastewater") generated in the silicon steel production process, and the wastewater is sent to the filter press 6 for pressure filtration through the centrifugal pump 9 to perform preliminary solid-liquid separation. When the treatment device is in use, it is necessary to ensure that the flow rate of the wastewater entering the collection tank 4 is less than or equal to the input end flow rate of the filter press 6, so it is necessary to add multiple filter presses 6 and strictly control the wastewater flow rate. With the increase in the number of filter presses 6, it is bound to cause the entire system to occupy a large area and increase power consumption. In addition, due to the low concentration of magnesium oxide in the wastewater, the waste mud after pressure filtration contains a large amount of water, which makes the waste mud difficult to form, and the waste mud is easy to clog the inside of the filter press 6, thereby affecting the wastewater treatment efficiency.

[0026] Based on the above factors, such as Figure 2 As shown, the utility model discloses a wastewater treatment device for a silicon steel production system, comprising:

[0027] Flocculation tank 1, flocculation tank 1 is used to receive wastewater discharged from the silicon steel production system;

[0028] The middle tank 2 is connected with the flocculation tank 1, and an overflow port 21 is provided on the side wall of the middle tank 2;

[0029] The sedimentation tank 3 is connected to the overflow port 21, and a sedimentation outlet 33 and a clear liquid outlet 34 are respectively provided on the bottom and side wall of the sedimentation tank 3;

[0030] The collecting tank 4 is connected to the clear liquid outlet 34, and the collecting tank 4 is connected to the settling tank 3 through the circulating pump 5;

[0031] The filter press 6 is provided with a feed port 61, a drain port 62 and a waste port 63. The feed port 61 is connected to the sedimentation outlet 33, the drain port 62 is connected to the sedimentation tank 3, and the waste port 63 is connected to the outside.

[0032] When the device is in operation, the wastewater generated by the silicon steel production system is passed into the flocculation tank 1, and flocculants are added into the flocculation tank 1. Through the coagulation and flocculation properties of the flocculants, the suspended particles and colloidal particles in the sewage are accumulated to form larger flocs, which helps to achieve solid-liquid separation, reduce the content of suspended matter in the wastewater, and make the wastewater meet the discharge standards.

[0033] After flocculation treatment, the wastewater in the flocculation tank 1 is passed into the intermediate tank 2. The intermediate tank 2 is located between the flocculation tank 1 and the sedimentation tank 3. It mainly plays the role of an intermediate buffer, which is convenient for adjusting the discharge flow of wastewater from the silicon steel production system, thereby reducing the discharge flow requirement for the wastewater. As the amount of wastewater in the intermediate tank 2 increases, the wastewater level is higher than the overflow port 21, and the wastewater enters the sedimentation tank 3 from the overflow port.

[0034] After the turbid wastewater enters the sedimentation tank 3, it is allowed to stand for sedimentation, so that solid waste accumulates at the bottom of the sedimentation tank 3, and wastewater with improved clarity accumulates above the solid waste.

[0035] After the sedimentation treatment is completed, the wastewater with increased clarity enters the collection tank 4, and is then transported to the sedimentation tank 3 again through the circulation pump 5, and is subjected to static sedimentation treatment to improve the clarity of the wastewater.

[0036] After the sedimentation treatment, the solid waste at the bottom of the sedimentation tank 3 accumulates to form sludge, specifically, magnesium oxide sludge. The sludge is discharged through the sedimentation outlet 33 and introduced into the filter press 6 through the feed port 61. The filter press 6 performs a filter press treatment so that most of the water in the sludge is discharged through the drain port 62 and then introduced into the sedimentation tank 3 to continue the sedimentation treatment to reduce the magnesium oxide concentration. The sludge with further reduced water content is discharged through the waste outlet 63.

[0037] During the filter press treatment, since the sludge is discharged from the sedimentation outlet 33 at the bottom of the sedimentation tank 3, the moisture content in the sludge is reduced, which greatly increases the concentration of solid particles inside the sludge. Therefore, compared with the prior art that uses multiple filter presses 6 for filter press treatment, the utility model only needs to use a single filter press 6 to complete solid-liquid separation, thereby greatly reducing the number of filter presses 6 used, thereby reducing power consumption and reducing the footprint of the entire wastewater treatment device. Moreover, since the moisture content before filter press is greatly reduced, the sludge after filter press is easy to form, reducing the possibility of internal blockage of the filter press 6, thereby helping to improve the wastewater treatment efficiency.

[0038] A further improvement is that a guide tube 22 extending in a vertical direction is provided in the middle tank 2 , the top end of the guide tube 22 is connected to the flocculation tank 1 , and the bottom end of the guide tube 22 is spaced from the inner bottom wall of the middle tank 2 .

[0039] A feed pump 12 is also provided between the guide tube 22 and the flocculation tank 1. The input end of the feed pump 12 is connected to the flocculation tank 1, and the output end is connected to the top of the guide tube 22. By providing the guide tube 22 and the feed pump 12, it is convenient to introduce the wastewater in the flocculation tank 1 from the top of the guide tube 22 and lead it out from the bottom of the guide tube 22, so that the wastewater accumulates from bottom to top in the middle tank 2. In addition, the guide tube 22 can also be used to limit the water flow speed and direction, slow down the wastewater flow rate, and maintain the stability of wastewater treatment.

[0040] A further improvement is that the flocculation tank 1 is connected with a stirring device to accelerate the mixing and contact between the suspended particles in the wastewater and the flocculant. Specifically, the stirring device includes a pneumatic stirrer 11.

[0041] After adding flocculant into the wastewater in the flocculation tank 1, the pneumatic agitator 11 is turned on to stir the wastewater inside the flocculation tank 1. Through strong stirring, the suspended particles and flocculant in the wastewater are fully mixed, and the formation of flocs is accelerated, which helps to improve the flocculation effect. In addition, compared with other stirring devices, the pneumatic agitator 11 can also provide sufficient air to the wastewater to prevent the flocs from settling in the flocculation tank 1. In this way, the uniform distribution of suspended matter in the water is ensured, which helps to maintain the stable operation of the system and avoid equipment blockage caused by precipitation.

[0042] A further improvement is that the sedimentation tank 3 includes a primary sedimentation tank 31 and a secondary sedimentation tank 32 which are connected in sequence along the flow direction of the wastewater, and a sedimentation outlet 33 is provided at the bottom of the primary sedimentation tank 31 and the bottom of the secondary sedimentation tank 32. The primary sedimentation tank 31 is connected to the overflow port 21, and the clear liquid outlet 34 is provided on the secondary sedimentation tank 32.

[0043] Compared with a single sedimentation tank 3, the utility model is provided with a primary sedimentation tank 31 and a secondary sedimentation tank 32 connected in sequence, which can perform sedimentation twice. Therefore, through the multi-level sedimentation structure, suspended matter and pollutants have sufficient time to settle, which improves the sedimentation treatment effect and helps to separate finer particulate pollutants in the wastewater; and, the primary sedimentation tank 31 and the secondary sedimentation tank 32 can better adapt to changes in water quality and flow, improve the stability of the system, better eliminate adverse effects such as short flow, vortex and dead zone, improve operating efficiency, and improve the treatment capacity by expanding the tank capacity and increasing the residence time, so as to meet the larger scale and higher standard wastewater treatment needs; compared with a single sedimentation tank 3, the primary sedimentation tank 31 and the secondary sedimentation tank 32 can achieve higher treatment capacity within the same area after being connected in series. During actual use, sludge is precipitated in the primary sedimentation tank 31 and gathered at the bottom. After the liquid level of the wastewater with improved clarity rises, it overflows into the secondary sedimentation tank 32. The wastewater continues to be precipitated in the secondary sedimentation tank 32, so that the sludge gathers at the bottom of the secondary sedimentation tank 32. This is beneficial to improving the solid-liquid separation effect, so that high-concentration magnesium oxide sludge is formed in the primary sedimentation tank 31 and the secondary sedimentation tank 32.

[0044] A further improvement is that a sludge tank 7 is provided between the sedimentation tank 3 and the filter press 6 , and the sludge tank 7 is connected to the feed inlet 61 and the sedimentation outlet 33 .

[0045] By setting up the sludge tank 7, it is convenient to introduce the high-concentration magnesium oxide sludge obtained after sedimentation in the primary sedimentation tank 31 and the secondary sedimentation tank 32. The sludge tank 7, as an intermediate storage unit for the sludge, can provide a buffering effect and reduce the flow requirement for the sludge. When the primary sedimentation tank 31 and the secondary sedimentation tank 32 are precipitated to form sludge, the magnesium oxide sludge in the sludge tank 7 is passed into the filter press 6 through the feed port 61 for filter pressing treatment.

[0046] A further improvement is that the sludge tank 7 is connected to the feed port 61 via a plunger pump 8 .

[0047] The utility model adopts a plunger pump 8 to transfer sludge. Compared with using a centrifugal pump 9 to transfer wastewater with low concentration of magnesium oxide, the power consumption is lower, and the plunger pump 8 has the characteristics of high efficiency and high head. The plunger pump 8 can effectively improve the sludge transfer efficiency and ensure the efficient operation of the wastewater treatment device.

[0048] A further improvement is that the output end of the circulation pump 5 is connected to the sedimentation tank 3 through the first valve group 51 and is connected to the outside through the second valve group 52.

[0049] After adopting the above structure, in the early and middle stages of wastewater treatment, the first valve group 51 is opened and the second valve group 52 is closed, and the wastewater circulates between the sedimentation tank 3, the sludge tank 7 and the filter press 6, and the solid particles in the wastewater are discharged through the waste outlet 63 in the form of magnesium oxide waste sludge. Therefore, as the wastewater circulates, the magnesium oxide concentration in the wastewater gradually decreases. In the later stage of wastewater treatment, the magnesium oxide concentration in the wastewater is reduced to the emission standard. At this time, the first valve group 51 is closed and the second valve group 52 is opened, so that the wastewater that meets the emission standard after treatment can be discharged to the outside.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A wastewater treatment device for a silicon steel production system, characterized in that: include: A flocculation tank (1), wherein the flocculation tank (1) is used to receive wastewater discharged from a silicon steel production system; An intermediate tank (2), the intermediate tank (2) being connected to the flocculation tank (1), and an overflow port (21) being arranged on a side wall of the intermediate tank (2); A sedimentation tank (3), the sedimentation tank (3) being in communication with the overflow port (21), and a sedimentation outlet (33) and a clear liquid outlet (34) being respectively arranged on the bottom and the side wall of the sedimentation tank (3); A collecting tank (4), the collecting tank (4) being in communication with the clear liquid outlet (34), and the collecting tank (4) being in communication with the settling tank (3) via a circulating pump (5); A filter press (6), wherein the filter press (6) is provided with a feed port (61), a drain port (62) and a waste discharge port (63), wherein the feed port (61) is connected to the sedimentation outlet (33), the drain port (62) is connected to the sedimentation tank (3), and the waste discharge port (63) is connected to the outside.

2. The wastewater treatment device for silicon steel production system according to claim 1, characterized in that: A flow guide tube (22) extending in a vertical direction is arranged in the intermediate tank (2); the top end of the flow guide tube (22) is connected to the flocculation tank (1), and the bottom end of the flow guide tube (22) is spaced apart from the inner bottom wall of the intermediate tank (2).

3. The wastewater treatment device for silicon steel production system according to claim 1, characterized in that: The flocculation tank (1) is connected to a stirring device to accelerate the mixing and contact between suspended particles in the wastewater and the flocculant.

4. The wastewater treatment device for silicon steel production system according to claim 3, characterized in that: The stirring device comprises a pneumatic stirrer (11).

5. The wastewater treatment device for silicon steel production system according to claim 1, characterized in that: The sedimentation tank (3) comprises a primary sedimentation tank (31) and a secondary sedimentation tank (32) which are connected in sequence along the flow direction of the wastewater, the bottom of the primary sedimentation tank (31) and the bottom of the secondary sedimentation tank (32) are both provided with a sedimentation outlet (33), the primary sedimentation tank (31) is connected to the overflow port (21), and the clear liquid outlet (34) is provided on the secondary sedimentation tank (32).

6. The wastewater treatment device for silicon steel production system according to claim 1, characterized in that: A sludge pool (7) is provided between the sedimentation tank (3) and the filter press (6), and the sludge pool (7) is connected to the feed port (61) and the sedimentation outlet (33).

7. The wastewater treatment device for silicon steel production system according to claim 6, characterized in that: The sludge tank (7) is connected to the feed port (61) via a plunger pump (8).

8. The wastewater treatment device for silicon steel production system according to claim 1, characterized in that: The output end of the circulation pump (5) is connected to the sedimentation tank (3) through a first valve group (51), and is connected to the outside through a second valve group (52).

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