Coagulation and flocculation integrated reaction tank based on pickling solution purification

Abstract

The coagulation and flocculation integrated reaction tank comprises a reaction tank body, the reaction tank body is divided into a coagulation reaction area and a flocculation reaction area through an arc-shaped baffle arranged in the reaction tank body in advance, and a pickling solution exchange opening used for exchanging solution with the coagulation reaction area is formed in the bottom of the flocculation reaction area; a first-stage dosing pipe, a second-stage dosing pipe, a first-stage driving motor and a second-stage driving motor are arranged at the top of the reaction tank, an output shaft of the first-stage driving motor is connected with a first-stage stirring rod extending to the coagulation reaction area, and an output shaft of the second-stage driving motor is connected with a second-stage stirring rod extending to the flocculation reaction area; the first-stage stirring rod is connected with two first-stage stirring paddles, and the second-stage stirring rod is vertically connected with three second-stage stirring paddles; a pickling solution input pipe and a pickling solution output pipe are oppositely arranged on the peripheral surface of the reaction tank, and a drain outlet is formed in the bottom of the reaction tank.

Description

Technical Field

[0001] The invention relates to the technical field of pickling equipment, in particular to a coagulation and flocculation integrated reaction tank based on pickling liquid purification. Background Art

[0002] In the process of acid washing liquid purification, coagulation and flocculation treatment processes are often used to make the insoluble particles in the solution form flocculated particles, settle under the action of gravity, and realize solid-liquid separation. At present, the treatment process uses two tanks for treatment. First, a coagulant is added to the coagulation reaction tank to neutralize the surface charge of the insoluble matter and destabilize it. After the reaction, the solution flows to the flocculation reaction tank, and then a flocculant is added to make the destabilized small insoluble particles form large flocculated particles. For example, a first mixed reaction tank and a second mixed reaction tank are set to respectively perform coagulation reaction and flocculation reaction of the insoluble matter in the acid washing liquid. After the reaction, the solution flows into the sedimentation tank for solid-liquid separation, thereby realizing the purification of the acid washing liquid. However, the production space occupied by the two reaction tanks is relatively large. The traditional acid washing liquid purification process uses a graphite heat exchanger to cool the acid washing liquid and then only adds a flocculant to remove the insoluble matter. However, this process often blocks the graphite heater and pipeline. Therefore, in recent years, some scholars have studied the coagulation and flocculation treatment process, which can purify the acid washing liquid under high temperature. At present, there are few newly built pickling units, and the coagulation and flocculation treatment process is mostly used for the transformation of old units. However, the production space of most units is very compact. Placing two reaction tanks will greatly compress the production space, making the equipment installation more compact, and even not conducive to equipment maintenance and personnel movement. Therefore, based on the above technical problems, this application proposes a coagulation and flocculation integrated reaction tank based on pickling liquid purification with a small footprint. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a coagulation and flocculation integrated reaction tank based on acid wash liquid purification with a small footprint.

[0004] In order to achieve the above-mentioned objectives, the present invention provides an integrated coagulation and flocculation reaction tank based on pickling liquid purification, comprising a reaction tank, wherein the reaction tank is divided into a coagulation reaction zone and a flocculation reaction zone by an arc-shaped baffle preset in the tank, wherein the bottom of the flocculation reaction zone is provided with a pickling liquid exchange port for exchanging solution with the coagulation reaction zone; the top of the reaction tank is provided with a first-level dosing pipe, a second-level dosing pipe, a first-level drive motor and a second-level drive motor, wherein the first-level dosing pipe is connected to the coagulation reaction zone, the second-level dosing pipe is connected to the flocculation reaction zone and the bottom of the second-level dosing pipe extends to the position above the pickling liquid exchange port of the flocculation reaction zone; the first-level dosing pipe is used to transport coagulant into the coagulation reaction zone, the second-level dosing pipe is used to transport flocculant into the flocculation reaction zone, and the output shaft of the first-level drive motor is connected to a motor extending to the coagulation reaction zone. The first-level stirring rod in the reaction zone, the output shaft of the second-level driving motor is connected with the second-level stirring rod extending to the flocculation reaction zone, wherein the first-level stirring rod is connected with two first-level stirring paddles, and the second-level stirring rod is vertically connected with three second-level stirring paddles; the first-level driving motor is used to drive the first-level stirring paddle, and the first-level stirring paddle is used to mix the solution in the coagulation reaction zone, and the second-level driving motor is used to drive the second-level stirring paddle, and the second-level stirring paddle is used to mix the solution in the flocculation reaction zone, and the outer peripheral surface of the reaction tank is provided with a pickling liquid input pipe and a pickling liquid output pipe relatively, wherein the pickling liquid input pipe is used to input the solution into the coagulation reaction zone, and the pickling liquid output pipe is used to output the solution in the flocculation reaction zone to the outside; the bottom of the reaction tank is provided with a sewage outlet, and the sewage outlet is used to discharge the insoluble matter after the solution reaction.

[0005] Furthermore, the top of the arc baffle is located between the top of the reaction tank inner cavity and the pickling liquid output pipe, the bottom edge of the arc baffle is below the secondary stirring paddle, and the two side surfaces of the arc baffle are connected to the two side walls of the pickling liquid output pipe.

[0006] Furthermore, the bottom of the reaction tank is a conical structure, and the effective volume of the flocculation reaction zone is 1 / 20 to 1 / 10 of the effective volume of the reaction tank.

[0007] Furthermore, the secondary drive motor is flange-connected to the reaction tank via a preset cover plate.

[0008] Furthermore, the diameter of the first-stage stirring paddle is greater than the diameter of the second-stage stirring paddle.

[0009] Furthermore, an overflow pipe for limiting the excessive height of the liquid level in the tank is also provided on the outer peripheral surface of the top of the reaction tank, wherein the overflow pipe is connected to the coagulation reaction zone.

[0010] Further, the vertical height of the overflow pipe is greater than the vertical height of the pickling liquid input pipe, and the vertical height of the pickling liquid input pipe is greater than the vertical height of the pickling liquid output pipe.

[0011] Furthermore, a position sensor for detecting the liquid level is also provided in the reaction tank, a primary solenoid valve for controlling on and off is also provided on the pickling liquid inlet pipe, and a secondary solenoid valve for controlling on and off is also provided on the pickling liquid outlet pipe.

[0012] Furthermore, the top of the reaction tank is also provided with an inspection port for facilitating subsequent maintenance and inspection of the interior of the reaction tank, and the inspection port is located at the center of the top of the reaction tank.

[0013] Furthermore, the height between the bottom of the secondary dosing pipe and the pickling liquid exchange port is 1 / 10 to 1 / 5 of the height between the pickling liquid exchange port and the pickling liquid output pipe.

[0014] The present invention adopts the above-mentioned solution, and its beneficial effects are: Through the structural design of separating the reaction tank, the tank is divided into a coagulation reaction zone and a flocculation reaction zone through an arc baffle, so that the coagulation and flocculation processes are carried out in the tank respectively. On the premise of ensuring the complete operation of the process, the space occupancy is improved and optimized, achieving the function of reducing the floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a top view of the reaction tank in this embodiment.

[0016] Figure 2 Schematic diagram of the cross section of the reaction tank in this embodiment.

[0017] Among them, 1-reaction tank, 11-coagulation reaction zone, 12-flocculation reaction zone, 13-pickling liquid exchange port, 14-pickling liquid inlet pipe, 141-first-level solenoid valve, 15-pickling liquid outlet pipe, 151-second-level solenoid valve, 16-overflow pipe, 17-drain port, 18-inspection port, 2-arc baffle, 3-first-level dosing pipe, 4-second-level dosing pipe, 5-first-level drive motor, 51-first-level stirring rod, 52-first-level stirring paddle, 6-second-level drive motor, 61-second-level stirring rod, 62-second-level stirring paddle, 7-cover plate, 8-position sensor. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0019] See attached Figure 1 , 2As shown, in this embodiment, a coagulation and flocculation integrated reaction tank based on acid washing liquid purification includes a reaction tank 1, and the reaction tank 1 is divided into a coagulation reaction zone 11 and a flocculation reaction zone 12 by a preset arc baffle 2 in the tank, wherein a pickling liquid exchange port 13 for exchanging solution with the coagulation reaction zone 11 is provided at the bottom of the flocculation reaction zone 12. Different from the traditional process of setting up two tanks for coagulation and flocculation respectively, in this embodiment, the arc baffle 2 is set inside the reaction tank 1 to divide the tank into the coagulation reaction zone 11 and the flocculation reaction zone 12, so that the reaction tank 1 performs the coagulation and flocculation processes accordingly, thereby reducing the floor space and reducing the production cost.

[0020] See attached Figure 1 As shown, in this embodiment, a primary dosing pipe 3, a secondary dosing pipe 4, a primary drive motor 5 and a secondary drive motor 6 are provided on the top of the reaction tank 1, wherein the primary dosing pipe 3 is connected to the coagulation reaction zone 11, the secondary dosing pipe 4 is connected to the flocculation reaction zone 12, and the bottom of the secondary dosing pipe 4 extends to the position above the pickling liquid exchange port 13 of the flocculation reaction zone 12, so that the secondary stirring paddle 62 cooperates with the secondary dosing pipe 4, so that the solution in the flocculation reaction zone 12 is fully mixed with the flocculant from bottom to top, thereby increasing the treatment effect, avoiding the flocculant from reacting with only part of the solution, and ensuring the integrity of the flocculation process.

[0021] See attached Figure 2 As shown, in this embodiment, the first-level dosing pipe 3 is used to transport coagulant into the coagulation reaction zone 11, the second-level dosing pipe 4 is used to transport flocculant into the flocculation reaction zone 12, the output shaft of the first-level driving motor 5 is connected to the first-level stirring rod 51 extending to the coagulation reaction zone 11, and the output shaft of the second-level driving motor 6 is connected to the second-level stirring rod 61 extending to the flocculation reaction zone 12, wherein the first-level stirring rod 51 is connected to two first-level stirring paddles 52 (preferably radial stirring paddles), and the second-level stirring rod 61 is vertically connected to three second-level stirring paddles 62 (preferably axial stirring paddles); the first-level driving motor 5 is used to drive the first-level stirring paddle 52, and the first-level stirring paddle 52 is used to mix the coagulation reaction zone 11. The solution in the coagulation reaction zone 11 is driven by the secondary driving motor 6, and the secondary stirring paddle 62 is used to mix the solution in the flocculation reaction zone 12. Specifically, the primary driving motor 5 drives the primary stirring paddle 52 through the primary stirring rod 51 to stir and mix the solution in the coagulation reaction zone 11, so as to realize the coagulation process. Secondly, the secondary driving motor 6 drives the secondary stirring paddle 62 through the secondary stirring rod 61 to stir and mix the solution in the coagulation reaction zone 11, so as to realize the flocculation process. The coagulation process and the flocculation process are executed successively in the reaction tank 1, so as to ensure the purification effect of the pickling liquid while reducing the equipment footprint.

[0022] See attached Figure 2As shown, in this embodiment, a pickling liquid inlet pipe 14 and a pickling liquid outlet pipe 15 are arranged on the outer peripheral surface of the reaction tank 1, wherein the pickling liquid inlet pipe 14 is used to input the solution into the coagulation reaction zone 11, and the pickling liquid outlet pipe 15 is used to output the solution in the flocculation reaction zone 12 to the outside, and the pickling liquid inlet pipe 14 is also provided with a primary electromagnetic valve 141 for controlling on and off, and the pickling liquid outlet pipe 15 is also provided with a secondary electromagnetic valve 151 for controlling on and off; a sewage outlet 17 is provided at the bottom of the reaction tank 1, and the sewage outlet Port 17 is used to discharge insoluble matter after the solution reaction. By correspondingly arranging a washing liquid input pipe and a pickling liquid output pipe 15 on the reaction tank 1, the orderly operation of solution input, solution output and impurity discharge in the reaction tank 1 is ensured; secondly, by arranging a first-level solenoid valve 141 on the pickling liquid input pipe 14 and a second-level solenoid valve 151 on the pickling liquid output pipe 15, it is ensured that when the reaction tank 1 is performing the coagulation and flocculation processes, the solution in the reaction tank 1 runs stably, thereby ensuring the output quality of the output pickling liquid.

[0023] See attached Figure 2 As shown, further, the top of the arc baffle 2 is located between the top of the inner cavity of the reaction tank 1 and the pickling liquid output pipe 15, the bottom edge of the arc baffle 2 is below the secondary stirring paddle 62, and the two side surfaces of the arc baffle 2 are connected to the two side walls of the pickling liquid output pipe 15, so that the arc baffle 2 ensures the separation of the coagulation reaction zone 11 and the flocculation reaction zone 12, avoiding the solution in the coagulation reaction zone 11 that has not been flocculated to be directly output through the pickling liquid output pipe 15, thereby ensuring the purification effect of the output pickling liquid.

[0024] In this embodiment, the bottom of the reaction tank 1 is a conical structure, and the effective volume of the flocculation reaction zone 12 is 1 / 20 to 1 / 10 of the effective volume of the reaction tank 1 .

[0025] Furthermore, the secondary drive motor 6 is flange-connected to the reaction tank 1 through a preset cover plate 7. Specifically, when the production personnel are inspecting the secondary stirring paddle 62, the bolts on the cover plate 7 can be removed to lift the secondary drive motor 6, the secondary stirring rod 61 and the secondary stirring paddle 62 together for inspection, thereby reducing maintenance costs and difficulty.

[0026] See attached Figure 2 As shown, in the present embodiment, the diameter of the first-stage stirring paddle 52 is greater than the diameter of the second-stage stirring paddle 62. The diameter of the above-mentioned stirring paddle is set according to the space size of the coagulation reaction zone 11 and the flocculation reaction zone 12. More specifically, the rotation speed of the first-stage stirring paddle 52 is 100~300r / min, and the rotation diameter of the first-stage stirring paddle 52 is 1 / 3~2 / 3 of the diameter of the reaction tank 1. The first-stage stirring paddle 52 is a stirring paddle type. Secondly, the rotation speed of the second-stage stirring paddle 62 is 40~150r / min, and the rotation diameter of the second-stage stirring paddle 62 is 1 / 3~2 / 3 of the distance from the top of the arc baffle 2 to the far end of the reaction tank 1.

[0027] See attached Figure 1 As shown, further, an overflow pipe 16 for limiting the excessive height of the liquid level in the tank is also provided on the outer peripheral surface of the top of the reaction tank 1, wherein the overflow pipe 16 is connected to the coagulation reaction zone 11; secondly, the vertical height of the overflow pipe 16 is greater than the vertical height of the pickling liquid input pipe 14, and the vertical height of the pickling liquid input pipe 14 is greater than the vertical height of the pickling liquid output pipe 15. A position sensor 8 for detecting the liquid level is also provided in the reaction tank 1. Specifically, by arranging the overflow pipe 16 on the reaction tank 1, excessive pressure inside the reaction tank 1 caused by excessive input of solution is avoided, thereby improving the safety of the tank body and reducing maintenance costs. By arranging the position sensor 8 in the reaction tank 1, it is easier for production personnel to control the amount of solution input inside the reaction tank 1 to ensure production efficiency.

[0028] See attached Figure 1 As shown, in this embodiment, the top of the reaction tank 1 is also provided with an inspection port 18 for facilitating subsequent maintenance and inspection of the interior of the reaction tank 1. The inspection port 18 is located at the center of the top of the reaction tank 1, so that production personnel can perform maintenance on the interior of the reaction tank 1 through the inspection port 18 during subsequent maintenance, thereby reducing the difficulty of maintenance and thus reducing the cost required for maintenance.

[0029] Furthermore, the height between the bottom of the secondary dosing pipe 4 and the pickling liquid exchange port 13 is 1 / 10 to 1 / 5 of the height between the pickling liquid exchange port 13 and the pickling liquid output pipe 15 .

[0030] For the convenience of explanation, further explanation is given below in combination with the specific working process of the reaction tank 1 in this embodiment.

[0031] During operation, first, the first-level electromagnetic valve 141 is opened, and the second-level electromagnetic valve 151 is closed, so that the pickling liquid enters the reaction tank 1 from the pickling liquid input pipe 14, and the first-level dosing pipe 3 inputs the coagulant into the coagulation reaction zone 11, so that the pickling liquid is in contact with the coagulant, and under the action of the first-level stirring paddle 52, the coagulant and the insoluble matter in the pickling liquid quickly undergo a coagulation reaction to form destabilized tiny particles; secondly, under the action of the arc baffle 2, the solution after the coagulation reaction enters the flocculation reaction zone 12 from the bottom of the coagulation reaction zone 11 through the pickling liquid exchange port 13; Flocculant is input into the flocculation reaction zone 12 through the secondary dosing pipe 4, and under the action of the secondary stirring paddle 62, the insoluble matter in the solution and the flocculant quickly undergo flocculation reaction; after a certain reaction time, the secondary solenoid valve 151 is opened to output the solution from the pickling liquid output pipe 15 to the next process, thereby completing the coagulation and flocculation purification of the solution.

[0032] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, makes more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or modifications are all equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A coagulation and flocculation integrated reaction tank based on acid wash liquid purification, comprising a reaction tank (1), characterized in that: The reaction tank (1) is divided into a coagulation reaction zone (11) and a flocculation reaction zone (12) by a pre-set arc-shaped baffle (2) in the tank, wherein the bottom of the flocculation reaction zone (12) is provided with an acid wash liquid exchange port (13) for exchanging solutions with the coagulation reaction zone (11); the top of the reaction tank (1) is provided with a primary dosing pipe (3), a secondary dosing pipe (4), a primary drive motor (5) and a secondary drive motor (6), wherein the primary dosing pipe (3) is connected to the coagulation reaction zone (11), and the secondary dosing pipe (4) is connected to the primary drive motor (5) and the secondary drive motor (6). The dosing pipe (4) is connected to the flocculation reaction zone (12), and the bottom of the secondary dosing pipe (4) extends to a position above the acid wash liquid exchange port (13) of the flocculation reaction zone (12); the primary dosing pipe (3) is used to transport coagulant to the flocculation reaction zone (11), and the secondary dosing pipe (4) is used to transport flocculant to the flocculation reaction zone (12); the output shaft of the primary drive motor (5) is connected to a primary stirring rod (51) extending to the flocculation reaction zone (11); the output shaft of the secondary drive motor (6) is connected to a primary stirring rod (51) extending to the flocculation reaction zone (11); The shaft is connected to a secondary stirring rod (61) extending to the flocculation reaction zone (12), wherein the primary stirring rod (51) is connected to two primary stirring paddles (52), and the secondary stirring rod (61) is vertically connected to three secondary stirring paddles (62); the primary driving motor (5) is used to drive the primary stirring paddle (52), and the primary stirring paddle (52) is used to mix the solution in the flocculation reaction zone (11); the secondary driving motor (6) is used to drive the secondary stirring paddle (62), and the secondary stirring The paddle (62) is used to mix the solution in the flocculation reaction zone (12); and the outer peripheral surface of the reaction tank (1) is provided with a pickling liquid inlet pipe (14) and a pickling liquid outlet pipe (15) opposite to each other, wherein the pickling liquid inlet pipe (14) is used to input the solution into the coagulation reaction zone (11), and the pickling liquid outlet pipe (15) is used to output the solution in the flocculation reaction zone (12) to the outside; and a sewage outlet (17) is provided at the bottom of the reaction tank (1), and the sewage outlet (17) is used to discharge insoluble matter after the solution reacts.

2. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1, characterized in that: The top end of the arc-shaped baffle (2) is located between the top of the inner cavity of the reaction tank (1) and the pickling liquid output pipe (15), the bottom end of the arc-shaped baffle (2) extends below the secondary stirring paddle (62), and the two side surfaces of the arc-shaped baffle (2) are connected to the two side walls of the pickling liquid output pipe (15).

3. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1 is characterized in that: The bottom of the reaction tank (1) is a conical structure, and the effective volume of the flocculation reaction zone (12) is 1 / 20 to 1 / 10 of the effective volume of the reaction tank (1).

4. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1 is characterized in that: The secondary drive motor (6) is flange-connected to the reaction tank (1) via a preset cover plate (7).

5. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1, characterized in that: The diameter of the first-stage stirring paddle (52) is greater than the diameter of the second-stage stirring paddle (62).

6. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1, characterized in that: An overflow pipe (16) for limiting the excessive height of the liquid level in the tank is also provided on the outer peripheral surface of the top end of the reaction tank (1), wherein the overflow pipe (16) is connected to the coagulation reaction zone (11).

7. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 6, characterized in that: The vertical height of the overflow pipe (16) is greater than the vertical height of the pickling liquid inlet pipe (14), and the vertical height of the pickling liquid inlet pipe (14) is greater than the vertical height of the pickling liquid outlet pipe (15).

8. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1, characterized in that: A position sensor (8) for detecting the liquid level is also provided in the reaction tank (1), a primary electromagnetic valve (141) for controlling on and off is also provided on the pickling liquid input pipe (14), and a secondary electromagnetic valve (151) for controlling on and off is also provided on the pickling liquid output pipe (15).

9. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1, characterized in that: The top of the reaction tank (1) is also provided with an inspection port (18) for facilitating subsequent maintenance and inspection of the interior of the reaction tank (1); the inspection port (18) is located at the center of the top of the reaction tank (1).

10. The coagulation and flocculation integrated reaction tank based on acid wash liquid purification according to claim 1, characterized in that: The height between the bottom of the secondary dosing pipe (4) and the pickling liquid exchange port (13) is 1 / 10 to 1 / 5 of the height between the pickling liquid exchange port (13) and the pickling liquid output pipe (15).

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