Wastewater treatment equipment and method for polyaluminum chloride production

Abstract

The invention discloses wastewater treatment equipment and method for polyaluminum chloride production, and relates to the technical field of polyaluminum chloride wastewater treatment. The equipment comprises an evaporation concentration part, a stirring part and a standing separation part, the evaporation concentration part comprises a water bathtub, an evaporation electric heating sleeve and a snake-shaped evaporation pipe, the snake-shaped evaporation pipe is vertically arranged in the water bathtub, and the pipe wall of the upper end of the snake-shaped evaporation pipe is communicated with a steam discharge pipe; a group of pressure valves are arranged at the upper end of a water bathtub cover fixedly covering the upper end of the water bathtub, and the evaporation electric heating sleeve fixedly sleeves the outer side wall of the water bathtub. According to the invention, water is injected into the water bathtub and submerges the S-shaped evaporation pipe, the evaporation electric heating sleeve is used for heating the water in the water bathtub, the pressure in the water bathtub is increased, and the temperature of the water in the water bathtub is raised to 100 DEG C or above, so that the moisture of wastewater in the S-shaped evaporation pipe is raised, evaporated and discharged; and meanwhile, aluminum oxide is prevented from being evaporated when the temperature is too high.

Description

Technical Field

[0001] The invention belongs to the technical field of polyaluminium chloride wastewater treatment, and in particular relates to wastewater treatment equipment and method for polyaluminium chloride production. Background Art

[0002] The wastewater used in the production of polyaluminium chloride mainly comes from specific industrial processes, with complex composition and strong pollutants. When the wastewater is harmlessly treated, it is necessary to evaporate and concentrate the wastewater first, evaporate and concentrate the wastewater to a mass fraction of aluminium oxide greater than 9%, increase the aluminium ion concentration to greater than 10g / L, and reduce the subsequent treatment volume. Since the boiling point of aluminium oxide is 180°C, directly heating the wastewater will easily lead to excessive temperature, causing the aluminium oxide to boil and evaporate. However, when using an ordinary water bath for heating, it is difficult to make the water in the wastewater reach the boiling point, resulting in low evaporation efficiency of the water in the wastewater.

[0003] To this end, we provide a wastewater treatment device and method for polyaluminium chloride production to solve the above problems. Summary of the Invention

[0004] The present invention aims to provide a wastewater treatment device for polyaluminium chloride production, comprising: an evaporation heating jacket sheathed on the outside of a water bathtub, a serpentine evaporation tube disposed in the water bathtub, a pressure valve disposed on a water bathtub cover at the upper end of the water bathtub, a vertical steam discharge pipe on the upper end wall of the serpentine evaporation tube, water poured into the water bathtub so as to submerge the serpentine evaporation tube, the evaporation heating jacket heating the water in the water bathtub, and simultaneously increasing the pressure in the water bathtub, causing the water in the water bathtub to be heated to above 100 degrees Celsius, thereby heating the wastewater in the serpentine evaporation tube to a temperature greater than 100 degrees Celsius, discharging water from the wastewater in the serpentine evaporation tube, and preventing evaporation of aluminium oxide when the temperature is too high; and a water pump pumping the evaporated and concentrated wastewater into a stirring component, adding sodium hydroxide into the stirring component, heating and stirring the stirring component to polymerise aluminium ions in the wastewater, and pumping the stirred wastewater into a static separation component for static separation, thereby achieving harmless treatment of the wastewater.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention discloses a wastewater treatment device for polyaluminium chloride production, comprising an evaporation and concentration component, a stirring component and a static separation component. The evaporation and concentration component comprises a water bathtub, an evaporation electric heating jacket and a serpentine evaporation tube. The serpentine evaporation tube is vertically arranged in the water bathtub, two ports of the serpentine evaporation tube penetrate the side wall of the water bathtub, one port of the serpentine evaporation tube is connected to the inlet end of the stirring component, the outlet end of the stirring component is connected to the static separation component, the upper end of the serpentine evaporation tube is connected to the tube wall thereof with a steam exhaust pipe, the upper end of the steam exhaust pipe is provided with a one-way valve with an outlet facing upward, the upper end of the water bathtub is fixedly covered with a water bathtub cover, the upper end of the water bathtub cover is provided with a group of pressure valves, and the evaporation electric heating jacket is fixedly sleeved on the outer side wall of the water bathtub.

[0006] The present invention is further configured as follows: the pressure valve includes an air outlet pipe, a pressure plug spring and a piston valve; the upper end of the air outlet pipe is closed and the lower end is connected to the bathtub cover; a group of air holes are opened through the upper side wall of the air outlet pipe; the upper end of the pressure plug spring is fixedly connected to the inner top surface of the air outlet pipe; the piston valve is vertically slidably sleeved in the air outlet pipe; and the lower end of the pressure plug spring is fixedly connected to the upper end surface of the piston valve.

[0007] The present invention is further configured as follows: the stirring component includes a stirring tank, a stirring electric heating jacket and a stirring paddle; the upper end opening of the stirring tank is covered with a stirring tank cover; the upper end rotating shaft of the stirring paddle passes through the stirring tank cover and is transmission-connected to the output end of the motor; the upper end surface of the stirring tank cover is connected to the outlet end of the water pump through a pipe; the water inlet end of the water pump connected to the stirring tank cover is connected to one of the ports of the serpentine evaporation tube through a pipe; the stirring electric heating jacket is fixedly mounted on the outside of the stirring tank; and the lower end of the stirring tank is connected to the inlet end of the static separation component through a pipe.

[0008] The present invention is further configured such that the static separation component includes a static cylinder and a solid-liquid separation component, a static cylinder cover is fixedly covered on the upper opening of the static cylinder, a through opening is opened through the bottom of the static cylinder, the solid-liquid separation component is arranged at the through opening, the upper end of the static cylinder cover is connected to the water outlet end of the water pump through a pipe, and the water inlet end of the water pump connected to the static cylinder cover is connected to the bottom end of the mixing tank through a pipe.

[0009] The present invention is further configured as follows: the solid-liquid separation component includes a top valve tube and a top pipe cylinder, an outer sleeve is fixedly sleeved in the through port, the outer sleeve extends downward, the top valve tube is vertically slidably sleeved in the outer sleeve, the upper end of the top valve tube is closed and the lower end is open, a top cap edge is fixedly provided on the outer side of the upper end of the top valve tube, a group of water permeable holes are penetrated through the outer side wall of the upper end of the top valve tube, a filter mesh tube is fixedly sleeved on the top valve tube at the height of the water permeable holes, the top pipe cylinder is arranged at the bottom of the static cylinder, a top pipe ear is fixedly provided on the outer side wall of the lower end of the top valve tube, and the telescopic end of the top pipe cylinder is fixedly connected to the upper end face of the top pipe ear.

[0010] The present invention also includes a method for treating wastewater from polyaluminium chloride production, comprising the following steps: S1: Concentration and aluminum extraction: The wastewater is passed into the serpentine evaporation tube, and water is added to the water bathtub so that the water in the water bathtub covers the serpentine evaporation tube. The water bathtub is heated by the evaporation electric heating jacket, so that the water in the water bathtub is heated and the wastewater in the serpentine evaporation tube is heated in a water bath; S2: Alkali polymerization: The wastewater evaporated by water bath heating is pumped into a stirring tank through a water pump, sodium hydroxide solution is slowly added to the stirring tank, a stirring electric heating jacket is used to heat the wastewater in the stirring tank, and a motor is started to drive a stirring paddle to rotate, so that the stirring paddle stirs the wastewater in the stirring tank for 3 to 10 hours; S3: Maturation and separation: The stirred wastewater is pumped into the static tank through a water pump, and the wastewater is allowed to stand in the static tank for 12 to 72 hours. After the static tank is completed, the jacking cylinder pulls the jacking ear at the lower end of the top valve pipe to lift the top valve pipe from the bottom of the static tank, so that the liquid in the static tank flows into the water permeable hole at the upper end of the top valve pipe, and the liquid is discharged from the lower end of the top valve pipe. The filter cylinder blocks the solids generated after the static tank from entering the top valve pipe. After the liquid in the static tank is drained, the jacking cylinder pushes the jacking ear downward, so that the top cap edge on the outer side of the upper end of the top valve pipe seals the opening; S4: By-product circulation: Sodium hydroxide solution is added to the still cylinder to adjust the pH of the solution in the still cylinder to 5 to 9 to obtain aluminum hydroxide precipitate. The top pipe cylinder pulls the top pipe ear at the lower end of the top valve pipe to lift the top valve pipe from the bottom of the still cylinder, so that the filtrate in the still cylinder flows into the water-permeable hole at the upper end of the top valve pipe, and the filtrate is discharged from the lower end of the top valve pipe. The filter mesh cylinder blocks the solids produced after standing from entering the top valve pipe. After the liquid in the still cylinder is discharged, the top pipe cylinder pushes the top pipe ear to move downward, so that the top cap edge on the outer side of the upper end of the top valve pipe seals the opening.

[0011] The present invention has the following beneficial effects: 1. The present invention comprises a tubular heating jacket placed outside a bathtub, a serpentine evaporation tube disposed within the tub, a pressure valve disposed on a tub cover at the upper end of the tub, and a vertical steam discharge pipe connected to the upper end wall of the serpentine evaporation tube. Water is poured into the tub to submerge the serpentine evaporation tube, and the heating jacket heats the water in the tub, increasing the pressure in the tub and raising the water temperature to above 100 degrees Celsius. This heats the wastewater in the serpentine evaporation tube to a temperature exceeding 100 degrees Celsius, allowing the wastewater in the serpentine evaporation tube to be discharged while preventing the evaporation of aluminum oxide when the temperature is too high. 2. The present invention uses a water pump to pump the evaporated and concentrated wastewater into a stirring component, adds sodium hydroxide to the stirring component, and heats and stirs it to polymerize the aluminum ions in the wastewater, and pumps the stirred wastewater into a static separation component for static separation, thereby achieving harmless treatment of the wastewater.

[0012] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts. Figure 1 This is a schematic diagram of the structure of a wastewater treatment equipment for polyaluminium chloride production; Figure 2 This is an exploded diagram of the evaporation and concentration components; Figure 3 is a side sectional view of the pressure valve; Figure 4 Schematic diagram of the disassembly of the stirring components; Figure 5 It is a side sectional view of a stationary separation component; Figure 6 It is an exploded schematic diagram of the static cylinder and the outer sleeve; Figure 7 It is a structural schematic diagram of the solid-liquid separation component; Figure 8 This is a flow chart of a method for treating wastewater used in the production of polyaluminium chloride; In the accompanying drawings, the components represented by the reference numerals are as follows: 1-evaporation and concentration component, 101-water bathtub, 101a-water bathtub cover, 101b-pressure valve, 101b-1-air outlet pipe, 101b-2-pressure plug spring, 101b-3-piston valve, 102-evaporation electric heating jacket, 103-serpentine evaporation tube, 103a-steam discharge pipe, 2-stirring component, 201-stirring cylinder, 201a-stirring cylinder cover, 202-stirring electric heating jacket, 203-stirring paddle, 3-static separation component, 301-static cylinder, 301a-static cylinder cover, 301b-port, 301b-1-outer sleeve, 302-solid-liquid separation component, 302a-top valve tube, 302a-1-top hat edge, 302a-2-water permeable hole, 302a-3-filter mesh cylinder, 302a-4-top pipe ear, 302b-top pipe cylinder DETAILED DESCRIPTION

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention. Example 1

[0015] See also Figure 1 and Figure 2 The present invention is a wastewater treatment equipment for polyaluminium chloride production, comprising an evaporation and concentration component 1, a stirring component 2 and a static separation component 3. The evaporation and concentration component 1 comprises a water bathtub 101, an evaporation electric heating jacket 102 and a serpentine evaporation tube 103. The evaporation electric heating jacket 102 is sheathed on the outside of the water bathtub 101, the serpentine evaporation tube 103 is arranged in the water bathtub 101, a group of pressure valves 101b are arranged on the water bathtub cover 101a at the upper end of the water bathtub 101, and a pressure valve 101b is arranged on the upper end of the serpentine evaporation tube 103. A vertical steam exhaust pipe 103a is provided on the pipe wall. Water is poured into the water bathtub 101 so that the water covers the serpentine evaporation tube 103. The evaporation heating jacket 102 heats the water in the water bathtub 101, thereby increasing the pressure in the water bathtub 101 and raising the temperature of the water in the water bathtub 101 to above 100 degrees Celsius. As a result, the wastewater in the serpentine evaporation tube 103 is heated to a temperature greater than 100 degrees Celsius, allowing the water in the wastewater to be discharged while preventing the evaporation of aluminum oxide due to excessive temperature.

[0016] Specifically, the serpentine evaporation tube 103 is vertically arranged in the water bathtub 101, and the two ports of the serpentine evaporation tube 103 pass through the side wall of the water bathtub 101. One port of the serpentine evaporation tube 103 is connected to the inlet end of the stirring component 2, and the outlet end of the stirring component 2 is connected to the static separation component 3. The upper end of the serpentine evaporation tube 103 is connected to the tube wall with a steam exhaust pipe 103a, and the upper end of the steam exhaust pipe 103a is provided with a one-way valve with the outlet facing upward. The upper end of the water bathtub 101 is fixedly covered with a water bathtub cover 101a, and the upper end of the water bathtub cover 101a is provided with a group of pressure valves 101b. The evaporation electric heating jacket 102 is fixedly sleeved on the outer wall of the water bathtub 101.

[0017] Furthermore, the pressure valve 101b includes an air outlet pipe 101b-1, a pressure plug spring 101b-2 and a piston valve 101b-3. The upper end of the air outlet pipe 101b-1 is closed and the lower end is connected to the bathtub cover 101a. A group of air holes are opened through the upper side wall of the air outlet pipe 101b-1. The upper end of the pressure plug spring 101b-2 is fixedly connected to the inner top surface of the air outlet pipe 101b-1. The piston valve 101b-3 is vertically slidably sleeved in the air outlet pipe 101b-1. The lower end of the pressure plug spring 101b-2 is fixedly connected to the upper end surface of the piston valve 101b-3.

[0018] The operation process of this embodiment is as follows: The evaporation heating jacket 102 is placed outside the bathtub 101, the serpentine evaporation tube 103 is placed inside the bathtub 101, a set of pressure valves 101b is set on the bathtub cover 101a at the upper end of the bathtub 101, and a steam discharge pipe 103a is vertically connected to the upper end of the serpentine evaporation tube 103. Water is poured into the bathtub 101 so that the water covers the serpentine evaporation tube 103. The evaporation heating jacket 102 heats the water in the bathtub 101, and at the same time increases the pressure in the bathtub 101, so that the bathtub 101 is heated. The water in 101 is heated to above 100 degrees Celsius, thereby heating the wastewater in the serpentine evaporation tube 103 to a temperature greater than 100 degrees Celsius, causing the wastewater in the serpentine evaporation tube 103 to evaporate and discharge into the water bathtub 101, while preventing the evaporation of aluminum oxide when the temperature is too high. When the pressure in the water bathtub 101 is too high, the air pressure pushes up the piston valve 101b-3, allowing the high-pressure steam in the water bathtub 101 to be discharged through the air vents on the top side wall of the outlet pipe 101b-1, thereby preventing the air pressure in the water bathtub 101 from being too high. Example 2

[0019] See also Figures 3 to 7 On the basis of Example 1, the stirring component 2 includes a stirring cylinder 201, a stirring electric heating jacket 202 and a stirring paddle 203, the static separation component 3 includes a static cylinder 301 and a solid-liquid separation component 302, the solid-liquid separation component 302 includes a top valve pipe 302a and a top pipe cylinder 302b, the wastewater that has been evaporated and concentrated is pumped into the stirring component 2 by a water pump, sodium hydroxide is added to the stirring component 2, and heated and stirred to polymerize the aluminum ions in the wastewater, the stirred wastewater is pumped into the static separation component 3 for standing, and then the solid-liquid separation component 302 in the static separation component 3 separates the liquid and solid precipitation, thereby achieving harmless treatment of the wastewater.

[0020] Specifically, the upper opening of the mixing tank 201 is covered with a mixing tank cover 201a, the upper end rotating shaft of the stirring paddle 203 passes through the mixing tank cover 201a and is transmission-connected to the output end of the motor, the upper end surface of the mixing tank cover 201a is connected to the outlet end of the water pump through a pipe, the water inlet end of the water pump connected to the mixing tank cover 201a is connected to one of the ports of the serpentine evaporation tube 103 through a pipe, the stirring electric heating jacket 202 is fixedly mounted on the outside of the mixing tank 201, and the lower end of the mixing tank 201 is connected to the inlet end of the static separation component 3 through a pipe.

[0021] Furthermore, a static cylinder cover 301a is fixedly covered at the upper opening of the static cylinder 301, a through opening 301b is opened through the bottom of the static cylinder 301, and the solid-liquid separation component 302 is arranged at the through opening 301b. The upper end of the static cylinder cover 301a is connected to the water outlet end of the water pump through a pipe, and the water inlet end of the water pump connected to the static cylinder cover 301a is connected to the bottom end of the mixing cylinder 201 through a pipe.

[0022] Furthermore, an outer sleeve 301b-1 is fixedly sleeved in the through port 301b, and the outer sleeve 301b-1 extends downward. The top valve tube 302a is vertically slidably sleeved in the outer sleeve 301b-1. The upper end of the top valve tube 302a is closed and the lower end is open. A top cap edge 302a-1 is fixedly provided on the outer side of the upper end of the top valve tube 302a. A group of water permeable holes 302a-2 are penetrated through the outer side wall of the upper end of the top valve tube 302a. A filter mesh cylinder 302a-3 is fixedly sleeved on the top valve tube 302a at the height of the water permeable holes 302a-2. The top pipe cylinder 302b is arranged at the bottom of the static cylinder 301, and a top pipe ear 302a-4 is fixedly provided on the outer side wall of the lower end of the top valve tube 302a. The telescopic end of the top pipe cylinder 302b is fixedly connected to the upper end surface of the top pipe ear 302a-4. Example 3

[0023] See also Figure 8 Based on Example 1 and Example 2, the present invention is a method for treating wastewater used in the production of polyaluminum chloride, comprising the following steps: S1: concentration and aluminum extraction; S2: alkali polymerization; S3: aging and separation; S4: by-product circulation.

[0024] Specifically, in S1, wastewater is passed into the serpentine evaporation tube 103, and water is added to the water bathtub 101 so that the water in the water bathtub 101 covers the serpentine evaporation tube 103. The evaporation heating jacket 102 heats the water bathtub 101, thereby heating the water in the water bathtub 101 and heating the wastewater in the serpentine evaporation tube 103 in a water bath.

[0025] Furthermore, in S2, the wastewater evaporated by water bath heating is pumped into the stirring tank 201 through a water pump, sodium hydroxide solution is slowly added to the stirring tank 201, the stirring electric heating jacket 202 heats the wastewater in the stirring tank 201, and the motor is started to drive the stirring paddle 203 to rotate, so that the stirring paddle 203 stirs the wastewater in the stirring tank 201 for 3 to 10 hours.

[0026] Furthermore, in S3, the stirred wastewater is pumped into the still cylinder 301 through a water pump, and the wastewater is allowed to stand in the still cylinder 301 for 12 to 72 hours. After the standing is completed, the top pipe cylinder 302b pulls the top pipe ear 302a-4 at the lower end of the top valve tube 302a, so that the top valve tube 302a is lifted from the bottom of the still cylinder 301, so that the liquid in the still cylinder 301 flows into the water permeable hole 302a-2 at the upper end of the top valve tube 302a, and the liquid is discharged from the lower end of the top valve tube 302a. The filter screen cylinder 302a-3 blocks the solids generated after standing from entering the top valve tube 302a. After the liquid in the still cylinder 301 is discharged, the top pipe cylinder 302b pushes the top pipe ear 302a-4 to move downward, so that the top cap edge 302a-1 on the outer side of the upper end of the top valve tube 302a blocks the opening 301b.

[0027] Furthermore, in S4, sodium hydroxide solution is added to the static cylinder 301 to adjust the pH of the solution in the static cylinder 301 to 5 to 9, thereby obtaining aluminum hydroxide precipitate. The top pipe cylinder 302b pulls the top pipe ear 302a-4 at the lower end of the top valve tube 302a, so that the top valve tube 302a is lifted from the bottom of the static cylinder 301, so that the filtrate in the static cylinder 301 flows into the water permeable hole 302a-2 at the upper end of the top valve tube 302a, and the filtrate is discharged from the lower end of the top valve tube 302a. The filter screen cylinder 302a-3 blocks the solids produced after standing from entering the top valve tube 302a. After the liquid in the static cylinder 301 is discharged, the top pipe cylinder 302b pushes the top pipe ear 302a-4 to move downward, so that the top cap edge 302a-1 on the outer side of the upper end of the top valve tube 302a blocks the opening 301b.

[0028] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A wastewater treatment device for polyaluminium chloride production, comprising an evaporation and concentration component (1), a stirring component (2) and a static separation component (3), characterized in that: The evaporation and concentration component (1) comprises a water bathtub (101), an evaporation electric heating jacket (102) and a serpentine evaporation tube (103). The serpentine evaporation tube (103) is vertically arranged in the water bathtub (101). Two ports of the serpentine evaporation tube (103) penetrate the side wall of the water bathtub (101). One port of the serpentine evaporation tube (103) is communicated with the inlet end of the stirring component (2). The outlet end of the stirring component (2) is communicated with the static separation component (3). The upper end of the serpentine evaporation tube (103) is connected to the tube wall and is provided with a steam discharge pipe (103a). The upper end of the steam discharge pipe (103a) is provided with a one-way valve with an outlet facing upward. The upper end of the water bathtub (101) is fixedly covered with a water bathtub cover (101a). The upper end of the water bathtub cover (101a) is provided with a group of pressure valves (101b). The evaporation electric heating jacket (102) is fixedly sleeved on the outer wall of the water bathtub (101).

2. A wastewater treatment equipment for polyaluminium chloride production according to claim 1, characterized in that: The pressure valve (101b) comprises an air outlet pipe (101b-1), a pressure plug spring (101b-2) and a piston valve (101b-3); the upper end of the air outlet pipe (101b-1) is closed and the lower end is connected to the bathtub cover (101a); a group of air holes are provided through the upper side wall of the air outlet pipe (101b-1); the upper end of the pressure plug spring (101b-2) is fixedly connected to the inner top surface of the air outlet pipe (101b-1); the piston valve (101b-3) is vertically slidably sleeved in the air outlet pipe (101b-1); and the lower end of the pressure plug spring (101b-2) is fixedly connected to the upper end surface of the piston valve (101b-3).

3. A wastewater treatment plant for polyaluminium chloride production according to claim 2, characterized in that: The stirring component (2) comprises a stirring cylinder (201), a stirring electric heating jacket (202) and a stirring paddle (203); the upper opening of the stirring cylinder (201) is covered with a stirring cylinder cover (201a); the upper end rotating shaft of the stirring paddle (203) passes through the stirring cylinder cover (201a) and is transmission-connected to the output end of the motor; the upper end surface of the stirring cylinder cover (201a) is connected to the outlet end of the water pump through a pipeline; the water inlet end of the water pump connected to the stirring cylinder cover (201a) is connected to one of the ports of the serpentine evaporation tube (103) through a pipeline; the stirring electric heating jacket (202) is fixedly sleeved on the outside of the stirring cylinder (201); and the lower end of the stirring cylinder (201) is connected to the inlet end of the static separation component (3) through a pipeline.

4. A wastewater treatment equipment for polyaluminium chloride production according to claim 3, characterized in that: The static separation component (3) comprises a static cylinder (301) and a solid-liquid separation component (302); the upper opening of the static cylinder (301) is fixedly covered with a static cylinder cover (301a); a through-port (301b) is provided through the bottom of the static cylinder (301); the solid-liquid separation component (302) is arranged at the through-port (301b); the upper end of the static cylinder cover (301a) is communicated with the water outlet of a water pump via a pipeline; and the water inlet of the water pump communicated with the static cylinder cover (301a) is communicated with the bottom end of the stirring cylinder (201) via a pipeline.

5. A wastewater treatment equipment for polyaluminium chloride production according to claim 4, characterized in that: The solid-liquid separation component (302) includes a top valve tube (302a) and a top tube cylinder (302b), an outer sleeve (301b-1) is fixedly sleeved in the through port (301b), the outer sleeve (301b-1) extends downward, and the top valve tube (302a) is vertically slidably sleeved in the outer sleeve (301b-1), the upper end of the top valve tube (302a) is closed and the lower end is open, a top cap edge (302a-1) is fixedly provided on the outer side of the upper end of the top valve tube (302a), and the top valve tube (302a) is fixedly sleeved in the outer sleeve (301b-1). A group of water-permeable holes (302a-2) are formed through the outer wall of the upper end of (302a); the top valve tube (302a) is fixedly sleeved with a filter screen cylinder (302a-3) at the height of the water-permeable holes (302a-2); the top pipe cylinder (302b) is arranged at the bottom of the static cylinder (301); a top pipe ear (302a-4) is fixedly provided on the outer wall of the lower end of the top valve tube (302a); and the telescopic end of the top pipe cylinder (302b) is fixedly connected to the upper end surface of the top pipe ear (302a-4).

6. A method for treating wastewater from polyaluminium chloride production, comprising the following steps: S1: concentration and aluminium extraction; S2: alkali polymerization; S3: aging and separation; S4: by-product recycling; characterized in that: In S1, the wastewater is passed into the serpentine evaporation tube (103) in the wastewater treatment equipment for polyaluminium chloride production as claimed in claim 5, water is added to the water bathtub (101) so that the water in the water bathtub (101) covers the serpentine evaporation tube (103), and the water bathtub (101) is heated by the evaporation heating jacket (102), so that the water in the water bathtub (101) is heated and the wastewater in the serpentine evaporation tube (103) is heated in a water bath.

7. A method for treating wastewater from polyaluminium chloride production according to claim 6, characterized in that: In S2, the wastewater evaporated by heating in a water bath is pumped into the stirring tank (201) through a water pump, a sodium hydroxide solution is slowly added to the stirring tank (201), the stirring electric heating jacket (202) heats the wastewater in the stirring tank (201), and the motor is started to drive the stirring paddle (203) to rotate, so that the stirring paddle (203) stirs the wastewater in the stirring tank (201) for 3 hours to 10 hours.

8. A method for treating wastewater from polyaluminium chloride production according to claim 7, characterized in that: In S3, the stirred wastewater is pumped into the static cylinder (301) through a water pump, and the wastewater is allowed to stand in the static cylinder (301) for 12 to 72 hours. After the standing is completed, the top pipe cylinder (302b) pulls the top pipe ear (302a-4) at the lower end of the top valve pipe (302a), so that the top valve pipe (302a) is lifted from the bottom of the static cylinder (301), so that the liquid in the static cylinder (301) flows into the permeable trough at the upper end of the top valve pipe (302a). The liquid in the water hole (302a-2) is discharged from the lower end of the top valve tube (302a), and the filter cylinder (302a-3) blocks the solids generated after standing to enter the top valve tube (302a). After the liquid in the standing cylinder (301) is completely discharged, the top tube cylinder (302b) pushes the top tube ear (302a-4) to move downward, so that the top cap edge (302a-1) on the outer side of the upper end of the top valve tube (302a) blocks the opening (301b).

9. A method for treating wastewater from polyaluminium chloride production according to claim 8, characterized in that: In S4, sodium hydroxide solution is added to the static cylinder (301) to adjust the pH of the solution in the static cylinder (301) to 5 to 9, thereby obtaining aluminum hydroxide precipitation. The top pipe cylinder (302b) pulls the top pipe ear (302a-4) at the lower end of the top valve pipe (302a), so that the top valve pipe (302a) is lifted from the bottom of the static cylinder (301), and the filtrate in the static cylinder (301) flows into the water permeable hole at the upper end of the top valve pipe (302a). (302a-2), the filtrate is discharged from the lower end of the top valve tube (302a), the filter screen cylinder (302a-3) blocks the solids generated after standing to enter the top valve tube (302a), and after the liquid in the standing cylinder (301) is discharged, the top tube cylinder (302b) pushes the top tube ear (302a-4) to move downward, so that the top cap edge (302a-1) on the outer side of the upper end of the top valve tube (302a) blocks the opening (301b).

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