A multi-stage neutralization reaction tank for pickling wastewater of die steel

Abstract

This utility model relates to the field of neutralization reaction tank technology, specifically a multi-stage neutralization reaction tank for pickling wastewater from mold steel. It includes a support base, a tank body mounted on top of the support base, and a stirring assembly inside the tank body. There are three tank bodies: a primary neutralization tank, a secondary sedimentation tank, and a tertiary regulating tank. The primary neutralization tank is connected to the secondary sedimentation tank, and the secondary sedimentation tank is connected to the tertiary regulating tank via connecting pipes. An inlet pipe is located on one side of the primary neutralization tank, and an outlet pipe is located on one side of the tertiary regulating tank. A feeding pipe is fixedly connected to the top of each of the three tank bodies. A rotating assembly is located on the top of the tank body to control the reciprocating rotation of the stirring assembly. A drain pipe is fixedly connected to the bottom of each of the three tank bodies, and a drain assembly is located at the bottom of the support base, connected to the drain pipe on the secondary sedimentation tank. This utility model provides a multi-stage neutralization reaction tank for pickling wastewater from mold steel with excellent neutralization effect and controllable reciprocating rotation of the stirring rod.

Description

Technical Field

[0001] This utility model relates to the field of neutralization reaction tank technology, specifically to a multi-stage neutralization reaction tank for pickling wastewater from mold steel. Background Technology

[0002] Pickling mold steel generates a large amount of acidic wastewater containing high concentrations of acids (such as sulfuric acid and hydrochloric acid) and heavy metal ions (such as iron, chromium, and nickel). Direct discharge of this wastewater without effective treatment will cause serious environmental pollution and may corrode pipes and equipment. Traditional neutralization methods typically employ a single-stage neutralization tank, adjusting the pH value by adding alkaline agents (such as sodium hydroxide or lime slurry) to precipitate heavy metal ions, followed by solid-liquid separation before discharge. However, this single-stage treatment method suffers from incomplete neutralization, poor precipitation, and unstable operation, making it difficult to meet increasingly stringent environmental protection requirements. The following drawbacks were discovered during its use:

[0003] 1. Single-stage neutralization tanks struggle to precisely control the pH gradient, leading to incomplete neutralization of acidic wastewater or excessive reagent dosage, thus affecting heavy metal precipitation. Due to the lack of a multi-stage reaction process, acids and heavy metals in the wastewater cannot be removed in stages, resulting in unstable pH in the final effluent and potential discharge exceeding standards.

[0004] 2. Traditional mixing devices typically use unidirectional rotation, leading to uneven mixing of the liquid within the tank, especially with high-viscosity flocculated sludge, resulting in low mixing efficiency. Unidirectional mixing easily creates "dead zones," where the reagents and wastewater do not react sufficiently in some areas, affecting neutralization and sedimentation effects.

[0005] Therefore, in view of this, we studied and improved the existing structure and proposed a multi-stage neutralization reaction tank for pickling wastewater of mold steel. Utility Model Content

[0006] The technical problem this invention aims to solve is that the neutralization effect of a single-stage neutralization tank is poor, and the stirring method is limited to only one direction of rotation.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a multi-stage neutralization reaction tank for pickling wastewater of mold steel, including a support base, a tank body is provided on the top of the support base, a stirring assembly is provided in the tank body, and three tank bodies are provided, namely a primary neutralization tank, a secondary sedimentation tank, and a tertiary regulating tank. The primary neutralization tank and the secondary sedimentation tank, and the secondary sedimentation tank and the tertiary regulating tank are all connected through connecting pipes. An inlet pipe is provided on one side of the primary neutralization tank, and an outlet pipe is provided on one side of the tertiary regulating tank. A feeding pipe is fixedly connected to the top of each of the three tank bodies.

[0008] The top of the tank is equipped with a rotating component that controls the reciprocating rotation of the stirring assembly;

[0009] The bottom of the three tanks is fixedly connected with a drain pipe, and the bottom of the support base is equipped with a drain assembly, which is connected to the drain pipe on the secondary sedimentation tank.

[0010] As a further aspect of this utility model: the pH adjustment range of the primary neutralization tank is 1.5-3.0, and alkaline agents are added through the feeding pipe to initially neutralize the acidic wastewater;

[0011] The pH adjustment range of the secondary sedimentation tank is 8.0-9.0. Flocculant is added through the feed pipe to cause heavy metal ions to precipitate.

[0012] The pH adjustment range of the three-stage regulating tank is 6.0-8.5. Acidic agents are added through the feed pipe to adjust the pH and ensure that the effluent meets the discharge standards.

[0013] As a further embodiment of this utility model: a water pump is fixedly installed through the connecting pipe, and a switch valve is installed at the inlet pipe, outlet pipe, and sewage pipe.

[0014] As a further embodiment of this utility model: the stirring assembly includes a stirring rod rotatably disposed inside the tank, and a plurality of stirring blades are evenly distributed and fixedly disposed around the stirring rod.

[0015] As a further embodiment of this utility model: the rotating assembly includes two gears and a pusher wheel rotatably disposed on the top of the tank, the two gears meshing with each other, the pusher wheel driving the stirring rod to rotate, a plurality of pusher rods fixedly disposed on the top of the gears, and the pusher rods on the gears push the pusher wheel, a receiving plate fixedly disposed on the top of the tank, and a motor for driving one of the gears to rotate fixedly disposed at the bottom of the receiving plate.

[0016] As a further embodiment of this utility model: the sewage discharge assembly includes an outlet pipe fixedly installed at the bottom of the support base, the top of the outlet pipe is fixedly connected to one of the sewage discharge pipes, the bottom of the outlet pipe is provided with an outlet, a rotating rod is rotatably installed inside the outlet pipe, and a spiral blade is fixedly wound around the rotating rod, and a second motor for driving the rotating rod to rotate is fixedly installed at one end of the outlet pipe.

[0017] Compared with the prior art, the advantages of this utility model are as follows:

[0018] 1. This utility model employs a three-stage series treatment process consisting of a primary neutralization tank, a secondary sedimentation tank, and a tertiary regulating tank to achieve precise pH gradient control, ensuring that acidic wastewater is neutralized step by step and avoiding excessive or insufficient reagents. The primary neutralization tank (pH 1.5-3.0) initially neutralizes the strongly acidic wastewater, reducing the load on subsequent treatments; the secondary sedimentation tank (pH 8.0-9.0) promotes the full precipitation of heavy metal ions; and the tertiary regulating tank (pH 6.0-8.5) ensures that the effluent meets discharge standards and improves treatment stability.

[0019] 2. This invention uses a rotating assembly to drive the stirring rod to rotate reciprocally, creating turbulence in the liquid inside the tank. This avoids the "dead zone" problem caused by unidirectional stirring and improves the mixing efficiency of the reagent and wastewater. The gears and the actuating wheel work together to achieve forward and reverse stirring, making it particularly suitable for high-viscosity flocculated sludge, enhancing sedimentation and reducing heavy metal residue. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of a multi-stage neutralization reaction tank for pickling wastewater of mold steel according to the present invention.

[0022] Figure 2 This is a cross-sectional view of a multi-stage neutralization reaction tank for pickling wastewater of mold steel according to this utility model.

[0023] Figure 3 This is a schematic diagram of the rotating component structure of a multi-stage neutralization reaction tank for pickling wastewater of mold steel according to the present invention.

[0024] Figure 4 This is a cross-sectional view of the sewage discharge component of a multi-stage neutralization reaction tank for pickling wastewater of mold steel according to this utility model.

[0025] In the attached image:

[0026] 1. Support base; 2. Tank body; 3. Agitator assembly; 4. Rotating assembly; 5. Sewage discharge assembly; 201. Connecting pipe; 202. Water pump; 203. Liquid inlet pipe; 204. Liquid outlet pipe; 205. Feeding pipe; 206. Sewage discharge pipe; 301. Agitator rod; 302. Agitator blade; 401. Gear; 402. Actuating wheel; 403. Actuating rod; 404. Support plate; 405. Motor 1; 501. Outlet pipe; 502. Rotating rod; 503. Spiral blade; 504. Motor 2. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-2 A multi-stage neutralization reaction tank for pickling wastewater from mold steel includes a support base 1. A tank body 2 is mounted on top of the support base 1. The tank body 2 comprises three tanks: a primary neutralization tank, a secondary sedimentation tank, and a tertiary regulating tank. The primary neutralization tank is connected to the secondary sedimentation tank, and the secondary sedimentation tank is connected to the tertiary regulating tank via connecting pipes 201. A water pump 202 is fixedly mounted on the connecting pipes 201. An inlet pipe 203 is located on one side of the primary neutralization tank, and an outlet pipe 204 is located on one side of the tertiary regulating tank. The tops of the three tank bodies 2 are all fixedly connected. There is a feed pipe 205; the pH adjustment range of the primary neutralization tank is 1.5-3.0. Alkaline agents are added through the feed pipe 205 to initially neutralize acidic wastewater. Switch valves are installed at the inlet pipe 203, outlet pipe 204, and sewage discharge pipe 206; the pH adjustment range of the secondary sedimentation tank is 8.0-9.0. Flocculants are added through the feed pipe 205 to precipitate heavy metal ions; the pH adjustment range of the tertiary regulating tank is 6.0-8.5. Acidic agents are added through the feed pipe 205 to adjust the pH and ensure that the effluent meets the discharge standards.

[0029] The treated wastewater is discharged or reused through the effluent pipe 204.

[0030] Please see Figure 1-3The tank body 2 is equipped with a stirring assembly 3, which includes a stirring rod 301 rotatably mounted inside the tank body 2, and several stirring blades 302 evenly distributed and fixed around the stirring rod 301. A rotating assembly 4 is provided at the top of the tank body 2 to control the reciprocating rotation of the stirring assembly 3. The rotating assembly 4 includes two gears 401 and a deflector wheel 402 rotatably mounted at the top of the tank body 2. The two gears 401 are meshed together, causing them to rotate in different directions. The deflector wheel 402 drives the stirring rod 301 to rotate. Several deflector rods 403 are fixedly mounted on the top of the gears 401, and the deflector rods 403 on the gears 401 deflect the deflector wheel 402. A receiving plate 404 is fixedly mounted at the top of the tank body 2, and a motor 405 that drives one of the gears 401 to rotate is fixedly mounted at the bottom of the receiving plate 404. When the lever 403 on one gear 401 moves the agitator wheel 402, it causes the agitator wheel 402 to rotate in one direction. When the lever 403 on the other gear 401 moves the agitator wheel 402, it causes the agitator wheel 402 to rotate in the other direction. The rotation of the agitator wheel 402 causes the stirring rod 301 to rotate, thereby causing the several stirring blades 302 to rotate as well.

[0031] Please see Figure 1-2 , Figure 4 Three tanks 2 are connected by a drain pipe 206 at their bottoms. A drain assembly 5 is installed at the bottom of the support base 1 and is connected to the drain pipe 206 on the secondary sedimentation tank. The drain assembly 5 includes an outlet pipe 501 fixedly installed at the bottom of the support base 1. One of the drain pipes 206 is fixedly connected to the top of the outlet pipe 501. An outlet is provided at the bottom of the outlet pipe 501. A rotating rod 502 is rotatably installed inside the outlet pipe 501, and a spiral blade 503 is fixedly wound around the rotating rod 502. A motor 504 for driving the rotating rod 502 is fixedly installed at one end of the outlet pipe 501. The rotation of the rotating rod 502 causes the spiral blade 503 to rotate, thereby assisting in the discharge of sediment.

[0032] Wastewater treatment process:

[0033] 1. Primary neutralization treatment

[0034] Acidic wastewater enters the primary neutralization tank through inlet pipe 203, while alkaline reagents (such as NaOH solution) are added through feed pipe 205.

[0035] Driven by the rotating component 4, the stirring component 3 performs reciprocating stirring (motor 405 can be started, which drives one gear 401 to rotate, causing the other gear 401 to rotate in the opposite direction, thereby controlling the actuating rods 403 on the two gears 401 to rotate in opposite directions. When the actuating rod 403 on one gear 401 actuates the actuating wheel 402, it drives the actuating wheel 402 to rotate in one direction. When the actuating rod 403 on the other gear 401 actuates the actuating wheel 402, it drives the actuating wheel 402 to rotate in the other direction, thereby realizing the reciprocating rotation of the actuating wheel 402, causing the stirring rod 301 to rotate reciprocally, which in turn drives several stirring blades 302 to rotate reciprocally), so that the wastewater and the reagent are fully mixed, and the pH is adjusted to 1.5-3.0, initially neutralizing the strongly acidic wastewater.

[0036] 2. Secondary sedimentation treatment

[0037] The wastewater that has been neutralized in the first stage can be pumped by one of the pumps 202 and flow into the secondary sedimentation tank through the connecting pipe 201. At the same time, flocculant (such as PAC or PAM) is added through the feed 205.

[0038] Under pH conditions of 8.0-9.0, heavy metal ions (such as Fe) 2+ Cr 3+ Hydroxide precipitates are formed, and the stirring component 3 promotes the formation of flocs and accelerates sedimentation.

[0039] Sediment enters the drainage component 5 through the bottom drain pipe 206, preventing pipe blockage.

[0040] 3. Three-stage pH adjustment

[0041] The supernatant flows into the three-stage conditioning tank, where a small amount of acid (such as HCl) or alkali is added through the feed pipe 205 to precisely adjust the pH to 6.0-8.5, ensuring that the effluent meets the standards.

[0042] Through the above three-stage treatment and automated control, this invention can achieve efficient neutralization of pickling wastewater, deep removal of heavy metals, and stable pH levels, while reducing energy consumption and maintenance costs, making it suitable for continuous industrial production.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A multi-stage neutralization reaction tank for pickling wastewater of mold steel, comprising a support base (1), a tank body (2) being disposed on the top of the support base (1), and a stirring assembly (3) being disposed inside the tank body (2), characterized in that: The tank body (2) is provided with three tanks, namely a primary neutralization tank, a secondary sedimentation tank, and a tertiary regulating tank. The primary neutralization tank and the secondary sedimentation tank, and the secondary sedimentation tank and the tertiary regulating tank are all connected by a connecting pipe (201). The primary neutralization tank is provided with an inlet pipe (203) on one side, and the tertiary regulating tank is provided with an outlet pipe (204) on one side. The top of the three tank bodies (2) is fixedly connected with a feeding pipe (205). The top of the tank (2) is provided with a rotating component (4) for controlling the reciprocating rotation of the stirring component (3); The bottom of the three tanks (2) is fixedly connected with a drain pipe (206), and the bottom of the support base (1) is provided with a drain assembly (5), which is connected to the drain pipe (206) on the secondary sedimentation tank.

2. The multi-stage neutralization reaction tank for die steel pickling wastewater according to claim 1, characterized in that: A water pump (202) is fixedly installed on the connecting pipe (201), and a switch valve is installed at the liquid inlet pipe (203), liquid outlet pipe (204), and sewage discharge pipe (206).

3. The multi-stage neutralization reaction tank for die steel pickling wastewater according to claim 1, characterized in that: The stirring assembly (3) includes a stirring rod (301) rotatably disposed inside the tank (2), and several stirring blades (302) are evenly distributed and fixed around the stirring rod (301).

4. The multi-stage neutralization reaction tank for die steel pickling wastewater according to claim 1, characterized in that: The rotating assembly (4) includes two gears (401) and a turn wheel (402) rotatably mounted on the top of the tank (2), with the two gears (401) meshing with each other. The turn wheel (402) drives the stirring rod (301) to rotate. Several turn levers (403) are fixedly mounted on the top of the gears (401), and the turn levers (403) on the gears (401) turn the turn wheel (402). A receiving plate (404) is fixedly mounted on the top of the tank (2), and a motor (405) that drives one of the gears (401) to rotate is fixedly mounted on the bottom of the receiving plate (404).

5. The multi-stage neutralization reaction tank for die steel pickling wastewater according to claim 1, characterized in that: The sewage discharge assembly (5) includes a discharge pipe (501) fixedly installed at the bottom of the support base (1). The top of the discharge pipe (501) is fixedly connected to one of the sewage pipes (206). The bottom of the discharge pipe (501) is provided with an outlet. A rotating rod (502) is rotatably installed inside the discharge pipe (501), and a spiral blade (503) is fixedly wound around the rotating rod (502). A second motor (504) for driving the rotating rod (502) to rotate is fixedly installed at one end of the discharge pipe (501).

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