Chlor-alkali chemical wastewater purification treatment device

Abstract

The application discloses a chlor-alkali chemical wastewater purification treatment device, which comprises a flocculation tank, a fast mixing assembly is arranged on the outer top surface of the flocculation tank, a buffer assembly, a slow mixing assembly and a discharge guide plate are sequentially arranged in the flocculation tank from top to bottom, the fast mixing assembly comprises a primary mixing tank and a self-mixing unit arranged at the lower end of the primary mixing tank, a horizontal liquid inlet pipe is arranged on one side of the primary mixing tank, the self-mixing unit comprises an upper straight pipe, a mixing pipe and a lower straight pipe which are connected in sequence from top to bottom, the upper end of the upper straight pipe of the self-mixing unit is communicated with the bottom of the primary mixing tank, and the lower end of the lower straight pipe of the self-mixing unit penetrates through the top of the flocculation tank and extends into the flocculation tank. The automatic fast mixing and automatic slow mixing operation of the PVC wastewater and the flocculant mixed liquid are realized, no external driving force is needed to drive mixing in the process, and the equipment cost and energy consumption are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a chlor-alkali chemical wastewater purification treatment device. BACKGROUND

[0002] In the production process of chlor-alkali chemical enterprises, the processes are numerous and complex, and the wastewater produced in different production processes has different qualities. The wastewater has great harm. In the production process of chlor-alkali enterprises, chlor-alkali production and PVC production are the main sources of wastewater. The wastewater produced in chlor-alkali enterprises has a high salt content. If effective measures are not taken for treatment, it will bring great threat to people's production and life. Chloride ions exceeding the standard will cause land salinization, which is not conducive to agricultural production. Therefore, the wastewater produced in chlor-alkali enterprises needs to be treated scientifically.

[0003] In the process of PVC production, a large amount of wastewater is produced, mainly including flushing water, leaching water and cooling water. Polyvinyl chloride and emulsifier are the main pollutants in the flushing water, and the flushing water is also the main source of PVC wastewater. The PVC wastewater is milky white and has a large amount of foam, and the smell is pungent. The wastewater can be treated by coagulation and filtration of chemicals.

[0004] When the PVC wastewater is added with a flocculant, a stirring and mixing device is needed to coagulate the mixed liquid. The coagulation operation generally adopts the hydraulic conditions of fast stirring (fast mixing) first and then slow stirring (flocculation). The purpose of fast stirring is to make the coagulant disperse into the water instantaneously, quickly and uniformly, so as to avoid uneven dispersion of the chemicals, which causes local high concentration of the chemicals and affects the hydrolysis of the coagulant and the action of the coagulant with colloids (or impurity particles) in the water. Slow stirring is to make the micro-flocculation generated in fast stirring grow into coarse and dense flocculation, so as to realize solid-liquid separation.

[0005] However, in the traditional PVC wastewater treatment equipment, two stirring devices are generally used to respectively perform fast stirring and slow stirring on the mixed liquid. The equipment cost is high, and a large amount of power resources is consumed in the long-term wastewater treatment process. In order to further reduce the equipment cost and energy consumption, and realize automatic fast mixing and slow mixing of the mixed liquid of PVC wastewater and flocculant, the present application provides a chlor-alkali chemical wastewater purification treatment device. SUMMARY

[0006] Based on the technical problems existing in the background technology, the present application provides a chlor-alkali chemical wastewater purification treatment device, which realizes automatic fast mixing and slow mixing of the mixed liquid of PVC wastewater and flocculant. In this process, no external driving force is needed for driving mixing, which effectively reduces the equipment cost and energy consumption.

[0007] The chlor-alkali chemical wastewater purification treatment device disclosed by the application comprises a flocculation tank, the outer top surface of the flocculation tank is provided with a fast mixing assembly, and the inside of the flocculation tank is sequentially provided, from top to bottom, with a buffer assembly, a slow mixing assembly and a discharge guide plate;

[0008] The fast mixing assembly comprises a primary mixing tank and a self-mixing unit arranged at the lower end of the primary mixing tank; one side of the primary mixing tank is provided with a horizontal liquid inlet pipe; the self-mixing unit comprises an upper straight pipe, a mixing pipe and a lower straight pipe which are connected in sequence from top to bottom; the upper end of the upper straight pipe of the self-mixing unit is communicated with the bottom of the primary mixing tank; and the lower end of the lower straight pipe of the self-mixing unit penetrates through the top of the flocculation tank and extends into the flocculation tank;

[0009] The buffer assembly comprises a receiving box and a flow resistance seat; the top and one side wall of the receiving box are in an open state; the flow resistance seat is in the shape of a wedge; and the wedge-shaped top of the flow resistance seat is connected to the opening of the one side wall of the receiving box, so that the top surface of the flow resistance seat is in the shape of an inclined plane;

[0010] The lower end of the lower straight pipe of the self-mixing unit extending into the flocculation tank is located at the open top of the receiving box;

[0011] The slow mixing assembly comprises two or more pairs of upper guide plates and lower guide plates arranged from top to bottom, and two or more pairs of upper baffle plates and lower baffle plates;

[0012] The upper guide plate is arranged on the lower side of the buffer assembly in an inclined state, and the inclined direction is opposite to the slope direction of the top surface of the flow resistance seat; the upper end of the upper guide plate is adjacent to the lower end of the wedge-shaped inclined surface of the flow resistance seat; a plurality of shunt holes are uniformly arranged on the upper guide plate along the center line; and a pair of flow resistance buffer blocks is arranged on the upper surface of the upper guide plate on both sides of each shunt hole along the width direction;

[0013] The lower guide plate is parallel to the upper guide plate; and the length of the lower guide plate is less than the length of the upper guide plate;

[0014] The upper baffle plate is arranged below the lower guide plate, and the inclined direction of the upper baffle plate is opposite to the inclined direction of the upper guide plate;

[0015] The structure of the upper baffle plate is the same as that of the upper guide plate;

[0016] The lower baffle plate is parallel to the upper baffle plate; and the length of the lower baffle plate is less than the length of the upper baffle plate;

[0017] The lower end of the first upper guide plate is fixedly connected to the upper end of the first upper baffle plate to form an upper connecting angle; the lower end of the first upper baffle plate is fixedly connected to the upper end of the second upper guide plate to form a lower connecting angle; and the two or more upper guide plates and the two or more upper baffle plates are sequentially connected to form staggered upper connecting angles and lower connecting angles;

[0018] The discharge guide plate is located below the slow mixing assembly and is in the shape of an inclined plate, the high end of the discharge guide plate is adjacent to the lowermost upper baffle, and the low end of the discharge guide plate is a discharge end and extends to the outside of the flocculation tank.

[0019] Preferably, the upper end of the upper straight pipe of the self-mixing unit is communicated with a contraction pipe; the contraction pipe is a trumpet pipe, the small-diameter end of the contraction pipe is communicated with the upper end of the upper straight pipe, and the large-diameter end of the contraction pipe is communicated with the bottom of the primary mixing tank; the mixing pipe is two or more rhombic pipes connected along the diagonal lines in the vertical direction; the mixing pipes of adjacent rapid mixing units are connected along the diagonal lines in the horizontal direction.

[0020] Preferably, four support columns are fixedly arranged at the four corners of the bottom surface of the primary mixing tank, and the lower ends of the four support columns extend into the flocculation tank from the top surface of the flocculation tank; a limiting ring is fixedly arranged on each support column, and a support spring is sleeved on the support column below the limiting ring.

[0021] Preferably, the lower ends of the four support columns in the flocculation tank are connected to the top frame of the receiving box.

[0022] Preferably, the bottom surface of the receiving box is inclined; the flow guide groove is arranged in the flow resistance seat and extends in the length direction; and the flow guide groove is parallel to the slope of the top surface of the flow resistance seat.

[0023] Preferably, the slow mixing assembly comprises three upper flow guide plates and three upper baffle plates, the upper connecting angles and the lower connecting angles formed by the staggered connection gradually decrease from top to bottom.

[0024] Preferably, the flow distribution hole is a rectangular hole, and a pair of flow resistance buffer blocks are symmetrically arranged on both sides of a pair of hole edges of the rectangular hole.

[0025] Preferably, the liquid inlet pipe is provided with a feeding pipe.

[0026] Preferably, the initial elastic force of the support spring is greater than the total mass of the primary mixing tank, the liquid inlet pipe, the self-mixing unit, the four connecting columns, the four limiting rings and the receiving box.

[0027] Preferably, the flow resistance buffer block is composed of two symmetrically distributed inclined strip blocks, and the flow distribution hole is arranged at the connection position of the two inclined strip blocks.

[0028] The beneficial technical effects of the present application are as follows:

[0029] The application achieves the full mixing of the mixed liquid by setting the quick mixing assembly, by the shunting and confluence of the mixed liquid of the diamond pipeline of the split and combined mixing pipe, and the flow speed of the mixed liquid is fast due to the large inclination angle of the side pipe of the diamond pipeline, so that the purpose of simulating the quick mixing of the mixed liquid is achieved, the mixed liquid after the quick mixing is buffered and slowed down by setting the buffer assembly, the multiple shunting and mixing operations of the mixed liquid are achieved by setting the slow mixing assembly, and the flow speed of the mixed liquid is slowly reduced as the inclination angles of the multiple slow mixing assemblies are smaller and smaller, so that the purpose of simulating the slow mixing and flocculation is achieved, and the automatic quick mixing and automatic slow mixing operations of the PVC wastewater and the flocculant mixed liquid are achieved by the cooperation of the above multiple parts, and no external driving force is needed to drive the mixing in the process, so that the equipment cost and energy consumption are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structure schematic view of the chlor-alkali chemical wastewater purification treatment device is provided for the application.

[0031] Figure 2 The sectional view of the chlor-alkali chemical wastewater purification treatment device is provided for the application.

[0032] Figure 3 The sectional front view of the chlor-alkali chemical wastewater purification treatment device is provided for the application.

[0033] Figure 4 The structure schematic view of the inside of the flocculation tank is provided for the application.

[0034] Figure 5 The structure schematic view of the inside of the flocculation tank is provided for the application.

[0035] Figure 6 The structure schematic view of the slow mixing assembly is provided for the application.

[0036] Figure 7 The structure schematic view of the upper flow guide plate is provided for the application.

[0037] Figure 8 The connection schematic view of the quick mixing assembly and the receiving hopper is provided for the application.

[0038] Figure 9 The structure sectional view of the quick mixing assembly and the receiving hopper is provided for the application.

[0039] In the figure: 1-flocculation tank, 2-fast mixing assembly, 21-primary mixing tank, 22-liquid inlet pipe, 23-feeding pipe, 24-liquid outlet contraction pipe, 25-self-mixing unit, 251-upper vertical pipe, 252-mixing pipe, 253-lower vertical pipe, 26-connecting column, 27-fixing ring block, 28-supporting spring, 3-buffer assembly, 31-accepting hopper, 32-flow resistance seat, 33-flow guide groove, 4-slow mixing assembly, 41-upper flow guide plate, 42-lower flow guide plate, 43-upper baffle plate, 44-lower baffle plate, 45-flow resistance buffer block, 46-flow dividing hole, 5-discharge guide plate. DETAILED DESCRIPTION

[0040] The application will be further explained in connection with specific embodiments.

[0041] Referring to Figure 1 and Figure 4 , the chlor-alkali chemical wastewater purification treatment device provided by the application comprises a flocculation tank 1, characterized in that: a fast mixing assembly 2 is arranged on the outer top surface of the flocculation tank 1, and the inside of the flocculation tank 1 is sequentially provided with a buffer assembly 3, a slow mixing assembly 4 and a discharge guide plate 5 from top to bottom.

[0042] As a preferred scheme of the application, referring to Figure 2 , Figure 3 , Figure 7 and Figure 8 , the fast mixing assembly 2 comprises a primary mixing tank 21 and a self-mixing unit 25 arranged at the lower end of the primary mixing tank 21; a horizontal liquid inlet pipe 22 is arranged on one side of the primary mixing tank 21, the self-mixing unit 25 comprises an upper straight pipe 251, a mixing pipe 252 and a lower straight pipe 253 which are connected in sequence from top to bottom, the upper end of the upper straight pipe 251 of the self-mixing unit is communicated with the bottom of the primary mixing tank 21, the lower end of the lower straight pipe 253 of the self-mixing unit penetrates through the top of the flocculation tank 1 and extends into the flocculation tank 1, the lower end of the lower straight pipe 253 of the self-mixing unit 25 extending into the flocculation tank 1 is located at the open top of the accepting hopper 31; the upper end of the upper straight pipe 251 of the self-mixing unit 25 is communicated with the contraction pipe 24; the contraction pipe 24 is a horn pipe, the small-diameter end of the contraction pipe 24 is communicated with the upper end of the upper straight pipe 251, and the large-diameter end of the contraction pipe 24 is communicated with the bottom of the primary mixing tank 21; the mixing pipe 252 is two or more than two rhombic pipes which are connected in sequence along the diagonal of the vertical direction; the mixing pipes 252 of adjacent fast mixing units are connected in sequence along the diagonal of the horizontal direction.

[0043] The four corners of the bottom surface of the primary mixing box 21 are respectively fixed with support columns 26, the lower ends of the four support columns 26 extend into the flocculation tank 1 from the top surface of the flocculation tank 1; a limiting ring 27 is fixed on each support column 26, a support spring 28 is sleeved on the support column 26 below the limiting ring 27; the lower ends of the four support columns 26 located in the flocculation tank 1 are respectively connected with the top frame of the receiving box 31; the liquid inlet pipe 22 is provided with a feeding pipe 23; the initial elastic force of the support spring 28 is greater than the total mass of the primary mixing box 21, the liquid inlet pipe 22, the self-mixing unit 25, the four connecting columns 26, the four limiting rings 27 and the receiving box 31.

[0044] As a preferred scheme of the present application, referring to Figure 4 and Figure 5 , the buffer assembly 3 comprises the receiving box 31 and the flow resistance seat 32; the top and one side wall of the receiving box 31 are in an open state; the flow resistance seat 32 is in the shape of a wedge, the wedge-shaped top of the flow resistance seat 32 is connected with the open part of the side wall of the receiving box 31, so that the top surface of the flow resistance seat 32 is in the shape of an inclined plane; the bottom surface of the receiving box 31 is in the shape of an inclined plane; one or more flow guide grooves 33 are arranged in the flow resistance seat 32, and the flow guide grooves 33 are parallel to the inclined plane of the top surface of the flow resistance seat 32.

[0045] As a preferred scheme of the present application, referring to Figures 4-7 , the slow mixing assembly 4 comprises two or more pairs of upper flow guide plates 41 and lower flow guide plates 42 from top to bottom, two or more pairs of upper baffle plates 43 and lower baffle plates 44; the upper flow guide plates 41 are arranged in an inclined state below the buffer assembly 3, and the inclined direction is opposite to the inclined direction of the inclined plane of the top surface of the flow resistance seat 32; the upper end of the upper flow guide plate 41 is adjacent to the lower end of the wedge-shaped inclined surface of the flow resistance seat 32; a plurality of flow distribution holes 46 are uniformly arranged on the upper flow guide plate 41 along the center line; a pair of flow resistance buffer blocks 45 is arranged on the upper surface of the upper flow guide plate 41 on both sides of each flow distribution hole 46 along the width direction; the lower flow guide plate 42 is parallel to the upper flow guide plate 41; the length of the lower flow guide plate 42 is less than the length of the upper flow guide plate 41; the upper baffle plate 43 is located below the lower flow guide plate 42, and the inclined direction is opposite to the inclined direction of the upper flow guide plate 41; the structure of the upper baffle plate 43 is the same as that of the upper flow guide plate 41; the lower baffle plate 44 is parallel to the upper baffle plate 43; the length of the lower baffle plate 44 is less than the length of the upper baffle plate 43; the lower end of the first upper flow guide plate 41 is fixedly connected with the upper end of the first upper baffle plate 43 to form an upper connecting corner, the lower end of the first upper baffle plate 43 is fixedly connected with the upper end of the second upper flow guide plate 41 to form a lower connecting corner, and the two or more upper flow guide plates 41 and the two or more upper baffle plates 43 are sequentially connected to form staggered upper connecting corners and lower connecting corners.

[0046] The three upper guide plates 41 and the three upper baffle plates 43 are included in the slow mixing assembly 4, and the upper connection angle and the lower connection angle formed by the staggered connection are sequentially reduced from top to bottom; the shunt hole 46 is a rectangular hole, and a pair of resistance flow buffer blocks 45 are symmetrically located on both sides of a pair of hole edges of the rectangular hole; the resistance flow buffer block 45 is composed of two symmetrically distributed inclined strip blocks, and the shunt hole 46 is arranged at the connection position of the two inclined strip blocks.

[0047] With reference to Figure 4 and Figure 5 The discharge guide plate 5 is located below the slow mixing assembly 4 and is in the form of an inclined plate, the high end of the discharge guide plate 5 is adjacent to the lowermost upper baffle plate 43, and the low end of the discharge guide plate 5 is the discharge end and extends to the outside of the flocculation tank 1.

[0048] The liquid inlet pipe 22 and the feeding pipe 23 are connected with an external water pump through a hose respectively, and the hose is used to adapt to the height change of the liquid inlet pipe 22 and the feeding pipe 23.

[0049] When the PVC wastewater needs to be subjected to coagulation operation, the PVC wastewater subjected to the pretreatment of demulsification and PH adjustment is delivered into the liquid inlet pipe 22 through a water pump, and the flocculant liquid is delivered into the feeding pipe 23 through a water pump, the flocculant liquid is preliminarily mixed with the PVC wastewater in the liquid inlet pipe 22 when entering the liquid inlet pipe 22, and the mixed liquid finally flows into the initial mixing tank 21, then the mixed liquid flows into the upper vertical pipe 251 through the liquid outlet contraction pipe under the action of gravity, and then enters the split and mixing pipe 252, at this time, the mixed liquid collides with the top inner wall of the rhombic pipe to be split into two water flows, the two water flows flow along two side pipes of the rhombic pipe respectively, and the two water flows in two adjacent rhombic pipes collide with each other to be mixed, then collide with the inner wall of the rhombic pipe again to be split into two water flows, and the process is repeated, finally, the mixed liquid converges at the top of the lower vertical pipe 253 and flows into the receiving hopper 31 through the lower vertical pipe 253, so that the sufficient mixing of the mixed liquid is realized, and the flow speed of the mixed liquid is fast due to the large inclination angle of the side pipe of the rhombic pipe, so that the purpose of simulating the fast mixing of the mixed liquid is achieved, and the automatic fast mixing of the mixed liquid is realized.

[0050] During the fast mixing of the mixed liquid, as more and more mixed liquid enters the initial mixing tank 21, the extrusion force of the initial mixing tank 21 on the supporting spring 28 increases, and the supporting spring 28 is contracted under the force, at this time, the overall height of the fast mixing assembly 2 is lowered, and the height of the receiving hopper 31 is lowered, that is, the bottom of the inner wall of the receiving hopper 31 is lower than the top of the resistance flow seat 32, that is, the opening of the receiving hopper 31 is partially blocked by the resistance flow seat 32 at this time, so that the mixed liquid flowing into the receiving hopper 31 is blocked by the resistance flow seat 32, so that the mixed liquid vertically flowing from the lower vertical pipe 253 is buffered and slowed down, so that the flow speed of the mixed liquid flowing into the slow mixing assembly 4 is in a slow state, thereby preparing for the slow mixing operation.

[0051] With the increase of the primary mixing box 21 mixed liquid, its receiving hopper 31 moves to the lowermost position, at this time, the plurality of guide grooves 33 are communicated with the opening of the receiving hopper 31, at this time, the mixed liquid in the receiving hopper 31 will flow along the plurality of guide grooves 33 to the uppermost upper guide plate 41, and flow downward along the track of the upper guide plate 41, in this process, the flow of the mixed liquid can be blocked by the flow resistance buffer block 45, so that the flow rate of the mixed liquid is slowed down to maintain a low flow state, another part of the mixed liquid will flow to the upper side of the lower guide plate 42 through the flow dividing hole 46, so as to realize the upper and lower two water flows, then the water flow on the upper guide plate 41 will flow to the upper side of the lower baffle 44, and the water flow on the lower guide plate 42 will flow to the upper side of the upper baffle 44, so as to realize the up-down switching of the two water flows, and the water flow on the upper baffle 44 will also be divided by the flow dividing hole 46 at the top thereof, the divided water flow will be mixed with the water flow on the lower baffle 44, so as to realize the multiple flow division and mixing operations of the mixed liquid through the cooperation of multiple slow mixing assemblies 4, and as the inclination angles of the multiple slow mixing assemblies 4 become smaller and smaller, the flow rate of the mixed liquid is slowly reduced, so as to achieve the purpose of simulating slow mixing flocculation, and realize the automatic slow mixing flocculation of the mixed liquid.

[0052] The mixed liquid after slow mixing flocculation will flow along the lowermost upper baffle 43 and the lower baffle 44 to the discharge guide plate 5 to be combined, and the combined mixed liquid will flow along the discharge guide plate 5 to the next process, and it should be noted that the discharge port is arranged at the position where the end surface of the flocculation tank 1 is in contact with the discharge guide plate 5.

[0053] Through the cooperation of the above multiple parts, the automatic fast mixing and automatic slow mixing operations of the PVC wastewater and the flocculant mixed liquid are realized, and in this process, no external driving force is needed to drive the mixing, so as to effectively reduce the equipment cost and energy consumption.

[0054] The present application gradually reduces the diameter of the liquid inlet contraction pipe 24 from top to bottom, so that the mixed liquid entering the self-mixing unit 25 has a high pressure, and due to the relationship between pressure and flow in the pipeline, it is a positive proportional relationship from the qualitative analysis point of view, that is, the greater the pressure, the greater the flow, and the flow is equal to the flow rate multiplied by the cross section, so that the mixed liquid in the self-mixing unit 25 has a fast flow rate, so as to provide condition guarantee for automatic fast mixing.

[0055] In the initial stage of the coagulation operation of the PVC wastewater and flocculant mixture by the device, the external water pump can be controlled to run at high speed, so that the PVC wastewater flow from the liquid inlet pipe 22 to the initial mixing box 21 is greater than the flow of the liquid outlet contraction pipe 24, so that the internal mixture of the initial mixing box 21 gradually increases, so that the supporting spring 28 is forced to contract, and the receiving hopper 31 is lowered, so that the cavity of the receiving hopper 31 and the end face of the flow resistance seat 32 can store a part of the mixture, and the flow rate of the high-speed mixture flowing out of the lower vertical pipe 253 is buffered, and finally the mixture flows to the slow mixing assembly 4 at a low flow rate.

[0056] When the liquid level of the mixture in the initial mixing box 21 rises to a certain height, and the receiving head 31 is lowered to the lowest position, the external water pump can be controlled to run at low speed, so that the PVC wastewater flow from the liquid inlet pipe 22 to the initial mixing box 21 is consistent with the flow of the liquid outlet contraction pipe 24; so as to avoid the liquid level of the mixture in the initial mixing box 21 to remain at this height.

[0057] When the liquid inlet pipe 22 stops conveying PVC wastewater, the mixture in the initial mixing box 21 will continue to flow downward along the liquid outlet contraction pipe 24, at this time the extrusion force of the initial mixing box 21 on the supporting spring 28 slowly decreases, and finally the fast mixing assembly 2 and the receiving hopper 31 are lifted to the highest degree, at this time the bottom of the inner wall of the opening of the receiving hopper 31 and the top of the flow resistance seat 32 are flush, so that the remaining mixture in the receiving hopper 31 can be completely discharged, avoiding residual.

[0058] The flow resistance buffer block 45 can block the flow of the mixture flowing on the upper surface of the upper guide plate 41 and the upper baffle plate 43, so that the flow rate of the mixture remains low, and the mixture can also be guided to flow along the inclined surface of the inclined strip block to the direction of the flow distribution hole 46, thereby realizing the flow distribution operation of the mixture. The water flow distributed through the plurality of flow distribution holes 46 will converge on the lower guide plate 41 and the lower baffle plate 41, respectively, thereby achieving the mixing effect. In addition, the setting of the flow distribution hole 46 can also avoid the residual phenomenon on the upper surface of the upper guide plate 41 and the upper baffle plate 43 due to the setting of the flow resistance buffer block 45. The slow-flowing mixture is effectively distributed and converged, which realizes the slow mixing operation of the mixture without the driving of external driving equipment, thereby effectively reducing the energy consumption of the PVC wastewater treatment.

Claims

1. A chlor-alkali chemical wastewater purification treatment device, characterized by, The flocculation tank (1) is externally provided with a fast mixing assembly (2), and the inside of the flocculation tank (1) is sequentially provided with a buffer assembly (3), a slow mixing assembly (4) and a discharge guide plate (5) from top to bottom; The fast mixing assembly (2) comprises a primary mixing tank (21) and a self-mixing unit (25) arranged at the lower end of the primary mixing tank (21); one side of the primary mixing tank (21) is provided with a horizontal liquid inlet pipe (22); the self-mixing unit (25) comprises an upper straight pipe (251), a mixing pipe (252) and a lower straight pipe (253) connected in sequence from top to bottom; the upper end of the upper straight pipe (251) of the self-mixing unit is communicated with the bottom of the primary mixing tank (21); the lower end of the lower straight pipe (253) of the self-mixing unit penetrates through the top of the flocculation tank (1) and extends into the flocculation tank (1); The buffer assembly (3) comprises a receiving box (31) and a flow resistance seat (32); the top and one side wall of the receiving box (31) are both in an open state; the flow resistance seat (32) is in the shape of a wedge; the wedge-shaped top of the flow resistance seat (32) is connected to the opening of the one side wall of the receiving box (31), so that the top surface of the flow resistance seat (32) is in the shape of an inclined plane; The lower end of the lower straight pipe (253) of the self-mixing unit (25) extending into the flocculation tank (1) is located at the open top of the receiving box (31); The slow mixing assembly (4) comprises two pairs of upper and lower flow guide plates (41) and (42) and two pairs of upper and lower baffle plates (43) and (44); The upper flow guide plate (41) is arranged below the buffer assembly (3) in an inclined state, and the inclined direction is opposite to the slope direction of the top surface of the flow resistance seat (32); the upper end of the upper flow guide plate (41) is adjacent to the lower end of the wedge-shaped inclined surface of the flow resistance seat (32); a plurality of shunt holes (46) are uniformly arranged on the upper flow guide plate (41) along the center line; a pair of flow resistance buffer blocks (45) is arranged on the upper surface of the upper flow guide plate (41) on both sides of each shunt hole (46) along the width direction; The lower flow guide plate (42) is parallel to the upper flow guide plate (41); the length of the lower flow guide plate (42) is less than that of the upper flow guide plate (41); The upper baffle plate (43) is arranged below the lower flow guide plate (42) and is inclined in a direction opposite to that of the upper flow guide plate (41); The structure of the upper baffle plate (43) is the same as that of the upper flow guide plate (41); The lower baffle plate (44) is parallel to the upper baffle plate (43); the length of the lower baffle plate (44) is less than that of the upper baffle plate (43); The lower end of the first upper flow guide plate is fixedly connected to the upper end of the first upper baffle plate to form an upper connecting angle; the lower end of the first upper baffle plate is fixedly connected to the upper end of the second upper flow guide plate to form a lower connecting angle; the two or more upper flow guide plates (41) and the two or more upper baffle plates (43) are alternately connected to form staggered upper and lower connecting angles. The discharge guide plate (5) is located below the slow mixing assembly (4) and is in the shape of an inclined plate, the high end of the discharge guide plate (5) is adjacent to the lowermost upper baffle (43), and the low end of the discharge guide plate (5) is a discharge end and extends to the outside of the flocculation tank (1); The upper straight pipe (251) of the self-mixing unit (25) is connected to the upper end of the contraction pipe (24); the contraction pipe (24) is a trumpet pipe, the small-diameter end of the contraction pipe (24) is connected to the upper end of the upper straight pipe (251), and the large-diameter end of the contraction pipe (24) is connected to the bottom of the primary mixing tank (21); the mixing pipe (252) is two or more rhombic pipes connected along the diagonal lines in the vertical direction; the mixing pipes (252) of adjacent self-mixing units are connected along the diagonal lines in the horizontal direction.

2. The chlor-alkali chemical wastewater purification treatment device according to claim 1, characterized in that, The four corners of the bottom surface of the primary mixing tank (21) are respectively fixed with support columns (26), the lower ends of the four support columns (26) extend into the flocculation tank (1) from the top surface of the flocculation tank (1); a limiting ring (27) is fixed on each support column (26), and a support spring (28) is sleeved on the support column (26) below the limiting ring (27); the lower ends of the four support columns (26) located in the flocculation tank (1) are respectively connected to the top frame of the receiving box (31).

3. The chlor-alkali chemical wastewater purification treatment device according to claim 1, characterized in that, The bottom surface of the receiving box (31) is inclined; the flow guide seat (32) is provided with one or more flow guide grooves (33) extending in the length direction, and the flow guide grooves (33) are parallel to the slope of the top surface of the flow guide seat (32).

4. The chlor-alkali chemical wastewater purification treatment device according to claim 1, characterized in that, The slow mixing assembly (4) includes three upper flow guide plates (41) and three upper baffle plates (43), and the upper connection angles and the lower connection angles formed by the staggered connection decrease from top to bottom.

5. The chlor-alkali chemical wastewater purification treatment device according to claim 1, characterized in that, The shunt hole (46) is a rectangular hole, and a pair of flow resistance buffer blocks (45) are symmetrically located on both sides of a pair of hole edges of the rectangular hole.

6. The chlor-alkali chemical wastewater purification treatment device according to claim 1, characterized in that, The liquid inlet pipe (22) is provided with a feeding pipe (23).

7. The chlor-alkali chemical wastewater purification treatment device according to claim 2, characterized in that, The initial elastic force of the support spring (28) is greater than the total mass of the primary mixing tank (21), the liquid inlet pipe (22), the self-mixing unit (25), the four support columns (26), the four limiting rings (27), and the receiving box (31).

8. The chlor-alkali chemical wastewater purification treatment device according to claim 1, characterized in that, The flow resistance buffer block (45) is composed of two symmetrically distributed inclined strip blocks, and the shunt hole (46) is arranged at the connection between the two inclined strip blocks.

Images