Lead-acid storage battery production waste liquid treatment and recovery equipment and method

Abstract

The invention discloses equipment and a method for treating and recycling lead-acid storage battery production waste liquid, and relates to the field of storage battery production. A sinking area is formed in the inner periphery of an inverted conical cylinder, and the top area of a premixing tank is connected with a liquid flow pipe and an air flow pipe with the tail ends stretching into the sinking area. A flow blocking ring located on the periphery of the inverted conical cylinder is arranged on the inner wall of the main device, a settling zone is formed below the flow blocking ring, and an upward flow zone is formed between the upper portion of the flow blocking ring and the inverted conical cylinder. A flow baffle is mounted between the main equipment and the premixing tank, an intersection area is formed between the flow baffle and the inverted conical cylinder, and a plurality of filter cartridges communicated with the upstream area and the intersection area are arranged on the annular side of the top of the inverted conical cylinder. A liquid outlet area is formed above the flow baffle, a gas collecting area is located above the liquid outlet area, a second motor is arranged at the bottom of the main device, and spiral blades used for driving liquid to move downwards are arranged in the main device. The spiral blades are adopted to push liquid and lead carbonate solid to flow, the precipitation process is accelerated, and the influence of excessive airflow on the filtering performance of the filter cartridge is avoided.

Description

Technical Field

[0001] The present invention relates to the technical fields of storage battery production and wastewater treatment, and particularly relates to a device and method for treating and recycling waste liquid in lead-acid battery production. Background Art

[0002] During the production process of lead-acid batteries, a large amount of lead-containing waste liquid is generated. To effectively remove lead ions in the waste liquid, a common treatment method is to introduce excessive carbon dioxide into the lead-containing waste liquid to generate insoluble lead carbonate, and then filter out the insoluble matter. However, there are many problems in the actual application of this traditional method.

[0003] On the one hand, the excessive carbon dioxide gas flow has a great impact on the filtration process. When a large amount of carbon dioxide gas directly flows through the filter cartridge, its flow rate is too fast, which will cause solid impurity particles to obtain greater kinetic energy. These particles are more likely to penetrate the pores of the filter element, resulting in a significant decline in the physical filtration effect of the filter cartridge on lead carbonate, making it difficult to ensure the quality of the treated liquid and unable to meet the requirements of industrial production for the treatment accuracy of waste liquid.

[0004] On the other hand, if the filter cartridge filtration is not adopted and the method of static precipitation is selected to separate lead carbonate, there will be a dilemma of low efficiency. The existing static precipitation methods either require a large amount of space and have a large equipment volume, increasing the production cost and space burden of the enterprise; or require a long time of static precipitation, seriously affecting the production efficiency and unable to adapt to the modern high-efficiency and continuous industrial production rhythm.

[0005] Therefore, designing a device for treating waste liquid in battery production that can quickly precipitate and efficiently filter lead carbonate precipitates has become a technical problem that urgently needs to be solved. Summary of the Invention

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0007] The present invention provides a waste liquid treatment and recycling device for lead-acid battery production, including a main device. A premixing tank is fixedly configured at the top of the main device. The premixing tank is connected with an air inlet pipe and a liquid inlet pipe whose ends extend into the inner bottom area thereof. Inside the main device, an inverted cone is configured below the premixing tank. A sinking area is formed inside the inverted cone. The top area of the premixing tank is connected with a liquid flow pipe and an air flow pipe whose ends extend into the sinking area. A baffle ring is configured on the inner wall of the main device outside the inverted cone. A precipitation area is formed below the baffle ring, and an upper flow area is formed between the upper part of the baffle ring and the inverted cone. A baffle plate is installed between the main device and the premixing tank. An intersection area is formed between the baffle plate and the inverted cone. A plurality of filter cartridges communicating the upper flow area and the intersection area are configured on the top ring side of the inverted cone. An outlet liquid area is formed above the baffle plate, and a gas collection area is formed above the outlet liquid area. The main device is configured with an outlet liquid pipe communicating with the outlet liquid area and an air flow circulation pipe communicating with the gas collection area. The main device is configured with a liquid level sensor for monitoring the liquid level height inside the main device and a pressure sensor for detecting the air pressure in the gas collection area. A second motor is configured at the bottom of the main device, and a spiral blade for driving the liquid to descend is configured inside, and the spiral blade is fixedly connected with the output end of the second motor. Among them, a sinking opening is provided at the bottom of the inverted cone, and the spiral blade passes through the sinking opening movably, penetrating through the sinking area and the precipitation area.

[0008] As a preferred technical solution of the device of the present invention: A first motor is configured at the top of the premixing tank. A first rotating shaft drivenly connected with the first motor and stirring blades fixed on the ring side of the first rotating shaft are provided inside the premixing tank. Among them, the air inlet pipe and the liquid inlet pipe extending into the premixing tank are outside the rotation range of the stirring blades.

[0009] As a preferred technical solution of the device of the present invention: The main device is configured with an inner top frame for fixing the premixing tank, and the baffle plate is located below the inner top frame.

[0010] As a preferred technical solution of the device of the present invention: The horizontal position of the connection port of the air flow pipe and the premixing tank is higher than the horizontal position of the connection port of the liquid flow pipe and the premixing tank.

[0011] As a preferred technical solution of the device of the present invention: An upper flow channel communicating with the intersection area is provided at the middle position of the bottom of the baffle plate, and the position of the connection port of the outlet liquid pipe and the main device is directly above the upper flow channel.

[0012] As a preferred technical solution of the device of the present invention: The horizontal position of the ends of the air inlet pipe and the liquid inlet pipe extending into the sinking area is lower than the horizontal position of the highest point of the spiral blade.

[0013] As a preferred technical solution of the device of the present invention: The radius of the spiral blade gradually decreases from top to bottom, and the radius of the sinking opening is greater than the radius of the spiral blade at the horizontal height position where the sinking opening is located.

[0014] As a preferred technical solution of the device of the present invention: a slag discharge pipe and a maintenance standby pipe connected to the precipitation area are provided at the bottom of the main device, and on-off valves are configured for the air inlet pipe, the liquid inlet pipe, the liquid outlet pipe, the air flow circulation pipe, the slag discharge pipe, and the maintenance standby pipe.

[0015] The present invention provides a method for treating and recycling waste liquid in lead-acid battery production, including the following steps:

[0016] Step 1: Introduce an excessive carbon dioxide gas flow into the bottom of the premixing tank through the air inlet pipe, and at the same time, introduce the waste liquid in lead-acid battery production into the bottom of the premixing tank through the liquid inlet pipe, and carry out a mixing and stirring reaction on the carbon dioxide gas flow and the waste liquid in the premixing tank.

[0017] Step 2: The mixed liquid obtained from the preliminary reaction in the premixing tank flows into the sinking area through the liquid flow pipe, and at the same time, the excessive unreacted carbon dioxide gas also enters the sinking area through the air flow pipe. The carbon dioxide gas entering the sinking area continuously contacts the mixed liquid obtained from the preliminary reaction, and further reacts, promoting the formation reaction of lead carbonate to be more complete.

[0018] Step 3: Start the second motor at the bottom of the main device to drive the spiral blade to rotate. The spiral blade pushes the liquid and the precipitated lead carbonate solid in the sinking area to continuously flow downward and enter the precipitation area. In the precipitation area, the lead carbonate solid gradually settles, and the liquid containing a small amount of lead carbonate solid flows upward and enters the upper flow area.

[0019] Step 4: The liquid in the upper flow area enters the intersection area after being filtered by the filter cartridge. In the intersection area, the liquid close to the spiral blade enters the sinking area again under the action of the spiral blade to participate in the subsequent precipitation process, and the part of the liquid far from the spiral blade flows upward and enters the liquid outlet area.

[0020] Step 5: The liquid level sensor monitors the liquid level height in the main device in real time. When the liquid level reaches the discharge standard, that is, when the liquid level exceeds the height of the liquid outlet pipe, open the liquid outlet pipe to discharge the treated liquid in the liquid outlet area from the main device.

[0021] Step 6: The unreacted carbon dioxide gas in the sinking area moves upward and accumulates in the gas collection area at the top of the main device. The air pressure sensor monitors the air pressure in the gas collection area in real time. When it is detected that the air pressure exceeds the standard, open the air flow circulation pipe to return the excessive carbon dioxide in the main device to supplement the carbon dioxide supply system.

[0022] Compared with the existing technology, the beneficial effects of the present invention are:

[0023] 1. In the present invention, by stirring the carbon dioxide gas flow and the lead-containing waste liquid in the premixing tank, the two are fully contacted and reacted to initially generate lead carbonate. Then, the mixed liquid and the unreacted carbon dioxide gas enter the sinking area to continue the reaction, promoting the formation reaction of lead carbonate to be more complete, and improving the removal rate of lead ions.

[0024] 2. Compared with the traditional static sedimentation method, the present invention uses a spiral blade to push the liquid and lead carbonate solid to flow, accelerating the sedimentation process, without the need for a large area of land occupation or long-term static settlement, meeting the requirements of high-efficiency and continuous industrial production.

[0025] 3. In the present invention, the excessive carbon dioxide introduced into the sinking area enters the gas collection area upward, preventing the excessive carbon dioxide gas flow from entering the sedimentation area and the upstream area together with the lead carbonate precipitate, ensuring the filtering effect of the filter cartridge on the lead carbonate precipitate. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the main structure of the device of the present invention and the gas-liquid flow.

[0027] Figure 2 It is a schematic diagram of the regional feature division of the device of the present invention.

[0028] Figure 3 It is Figure 2 a schematic diagram of the enlarged regional features at location A in

[0029] Figure 4 It is Figure 2 a schematic diagram of the enlarged regional features at location B in

[0030] Figure 5 It is Figure 2 a schematic diagram of the enlarged regional features at location C in

[0031] Figure 6 It is Figure 2 a schematic diagram of the enlarged regional features at location D in

[0032] Among them: 1 - main equipment, 101 - sinking area, 102 - sedimentation area, 103 - upstream area, 104 - intersection area, 105 - liquid outlet area, 106 - gas collection area; 2 - premixing tank; 3 - inner top frame; 4 - baffle, 401 - upstream channel; 5 - inverted cone, 501 - sinking opening; 6 - baffle ring; 7 - first motor; 8 - first rotating shaft; 9 - stirring blade; 10 - air inlet pipe; 11 - liquid inlet pipe; 12 - liquid flow pipe; 13 - gas flow pipe; 14 - bottom frame; 15 - second motor; 16 - spiral blade; 17 - filter cartridge; 18 - liquid level sensor; 19 - liquid outlet pipe; 20 - air pressure sensor; 21 - gas flow circulation pipe; 22 - slag discharge pipe; 23 - maintenance standby pipe. Detailed Embodiments

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] Example 1: The present invention designs a waste liquid treatment and recycling device for lead-acid batteries, as Figure 1 , which mainly consists of a main device 1 and a premixing tank 2. The premixing tank 2 is fixed on the top of the main device 1. Inside the main device 1, there are structures such as an inverted conical cylinder 5, a baffle ring 6, and a baffle plate 4. These structures divide the interior of the main device 1 into multiple functional areas, including a sinking area 101, a precipitation area 102, an upward flow area 103, a confluence area 104, a liquid outlet area 105, and a gas collection area 106. Each area cooperates with each other to achieve the treatment and recycling of lead-containing waste liquid. The specific structural design is as follows:

[0035] Premixing tank 2: As Figure 2 , Figure 3 , the premixing tank 2 is connected to an air inlet pipe 10 and a liquid inlet pipe 11, and the ends of both extend into the inner bottom area of the premixing tank 2. A first motor 7 is configured on the top of the premixing tank 2. The first motor 7 drives a first rotating shaft 8 to rotate. Stirring blades 9 are fixed on the circumferential side of the first rotating shaft 8, and their function is to enable the carbon dioxide gas flow to fully contact and react with the lead-containing waste liquid. By arranging the air inlet pipe 10 and the liquid inlet pipe 11 outside the rotation range of the stirring blades 9, it is possible to avoid interference of the operation of the stirring blades 9 on the pipes and ensure the stable input of gas and waste liquid. Under the stirring action of the stirring blades 9, carbon dioxide and the waste liquid can be quickly and fully mixed, accelerating the formation reaction of lead carbonate and improving the removal rate of lead ions.

[0036] Sinking area 101 and related pipes: As Figure 1 , Figure 3 , Figure 4 , the inner circumference of the inverted conical cylinder 5 forms the sinking area 101. The top area of the premixing tank 2 is connected to a liquid flow pipe 12 and a gas flow pipe 13, and the ends of both extend into the sinking area 101. The horizontal position of the connection port of the gas flow pipe 13 with the premixing tank 2 is higher than the horizontal position of the connection port of the liquid flow pipe 12 with the premixing tank 2. This design can prevent the liquid in the premixing tank 2 from flowing back when being discharged, ensuring that the preliminary reaction mixture flows into the sinking area 101 through the liquid flow pipe 12, and the excessive unreacted carbon dioxide gas enters the sinking area 101 through the gas flow pipe 13, enabling the two to continue to contact and react in the sinking area 101, further promoting the formation of lead carbonate and improving the removal effect of lead ions.

[0037] Precipitation area 102 and baffle ring 6: As Figure 1 , Figure 2 , Figure 4, a baffle ring 6 is arranged on the inner wall of the main device 1. The baffle ring 6 is located outside the inverted conical cylinder 5, and a precipitation area 102 is formed below the baffle ring 6. A slag discharge pipe 22 and a maintenance standby pipe 23 connected to the precipitation area 102 are arranged at the bottom of the main device 1. The precipitation area 102 is used to make the lead carbonate solid settle by its own gravity to achieve preliminary solid-liquid separation. The baffle ring 6 can block the lead carbonate solid and liquid during the sinking process to prevent their disorderly flow and ensure the stable progress of the precipitation process. The precipitated lead carbonate solid can be regularly discharged through the slag discharge pipe 22, and the maintenance standby pipe 23 is used to discharge the remaining liquid in the main device 1 to facilitate equipment maintenance.

[0038] The upflow area 103, the intersection area 104 and the filter cartridge 17: As Figure 1 , Figure 4 , Figure 5 , an upflow area 103 is formed between the baffle ring 6 and the inverted conical cylinder 5 above. A baffle plate 4 is installed between the main device 1 and the premixing tank 2, and an intersection area 104 is formed between the baffle plate 4 and the inverted conical cylinder 5. A plurality of filter cartridges 17 are arranged on the circumferential side of the top of the inverted conical cylinder 5, and the filter cartridges 17 communicate with the upflow area 103 and the intersection area 104. The liquid containing a small amount of lead carbonate solid in the upflow area 103 enters the intersection area 104 after being filtered by the filter cartridges 17. The filter cartridges 17 can effectively intercept the lead carbonate solid particles and improve the filtering effect of the liquid. In the intersection area 104, the liquid close to the spiral blade 16 re-enters the sinking area 101 under the action of the spiral blade 16 to participate in the subsequent precipitation process, and part of the liquid far from the spiral blade 16 flows upward into the liquid outlet area 105. The liquid close to the spiral blade 16 flows back to form a transition protection area to prevent the lead carbonate solid in the sinking area 101 from entering the liquid outlet area 105 upward and ensure the liquid outlet quality.

[0039] The liquid outlet area 105 and the liquid outlet pipe 19: As Figure 1 , Figure 5 , a liquid outlet area 105 is formed above the baffle plate 4, and a liquid outlet pipe 19 communicated with the liquid outlet area 105 is arranged on the main device 1. A upflow channel 401 communicated with the intersection area 104 is arranged at the middle position of the bottom of the baffle plate 4, and the position of the connection port of the liquid outlet pipe 19 and the main device 1 is directly above the upflow channel 401. The liquid after filtration and precipitation treatment is collected in the liquid outlet area 105. Combining Figure 6 , when the liquid level sensor 18 monitors that the liquid level in the main device 1 reaches the discharge standard (that is, the liquid level exceeds the height of the liquid outlet pipe 19), the liquid outlet pipe 19 is opened to discharge the treated liquid from the main device 1 to achieve the up-to-standard discharge after waste liquid treatment.

[0040] The gas collection area 106 and the gas flow circulation pipe 21: As Figure 1 , Figure 6, above the liquid outlet area 105 is the gas collection area 106, and the main device 1 is configured with an air flow circulation pipe 21 communicated with the gas collection area 106. The unreacted carbon dioxide gas in the sinking area 101 moves upward and accumulates in the gas collection area 106. The air pressure sensor 20 monitors the air pressure in the gas collection area 106 in real time. When the monitored air pressure exceeds the standard, the air flow circulation pipe 21 is opened, and the excessive carbon dioxide in the main device 1 is refluxed and supplemented to the carbon dioxide supply system. Combined with Figure 5 , this design avoids excessive carbon dioxide gas flow from entering the precipitation area 102 and the upstream area 103 together with the lead carbonate precipitate, ensures the filtering effect of the filter cartridge 17 on the lead carbonate precipitate, and at the same time realizes the recycling of carbon dioxide.

[0041] The second motor 15 and the spiral blade 16: As Figure 1 , Figure 4 , the bottom of the main device 1 is configured with a second motor 15, and a spiral blade 16 is internally configured. The spiral blade 16 is fixedly connected to the output end of the second motor 15. The bottom of the inverted cone 5 is provided with a sinking port 501. The spiral blade 16 passes through the sinking port 501 movably, penetrates through the sinking area 101 and the precipitation area 102, and the radius of the spiral blade 16 gradually decreases from top to bottom. The radius of the sinking port 501 is larger than the radius of the spiral blade 16 at the horizontal height position where the sinking port 501 is located. When the second motor 15 drives the spiral blade 16 to rotate, the spiral blade 16 pushes the liquid and the precipitated lead carbonate solid in the sinking area 101 to continuously flow downward and enter the precipitation area 102, accelerating the precipitation process. Compared with the traditional static precipitation method, it does not require a large area of land occupation or long-term static settlement, meeting the requirements of high-efficiency and continuous industrial production. The special radius design of the spiral blade 16 helps it to more effectively push the liquid and solid to flow and improve the precipitation efficiency.

[0042] Pipeline valves: As Figure 1 , Figure 2 , the intake pipe 10, the inlet liquid pipe 11, the outlet liquid pipe 19, the air flow circulation pipe 21, the slag discharge pipe 22, and the maintenance standby pipe 23 are all configured with on-off valves. These valves can control the on-off of the fluid in each pipeline, facilitating the operation and maintenance of the equipment. For example, when the equipment is under maintenance, the corresponding valves can be closed to prevent liquid or gas leakage; when adjusting the reaction conditions or treatment process, the flow rate and flow direction of each pipeline can be flexibly controlled.

[0043] Embodiment 2. The present invention designs a method for treating and recycling waste liquid in lead-acid battery production, and the specific working principle is as follows:

[0044] Step 1, premixing reaction: Pass an excessive carbon dioxide gas stream through the inlet pipe 10 into the bottom of the premixing tank 2. At the same time, the inlet liquid pipe 11 introduces the waste liquid from lead-acid battery production into the bottom of the premixing tank 2. Start the first motor 7 at the top of the premixing tank 2 to drive the first rotating shaft 8 to drive the stirring blades 9 to fully stir the carbon dioxide gas stream and the waste liquid in the tank. During this process, carbon dioxide reacts with the waste liquid, and lead carbonate solids gradually precipitate, but are evenly dispersed in the mixed liquid due to the stirring effect. This step promotes the full contact between carbon dioxide and the waste liquid through stirring, accelerates the reaction rate, provides a good reaction basis for subsequent precipitation and filtration, and improves the removal efficiency of lead ions.

[0045] Step 2, reaction in the sinking area: The mixed liquid that has undergone a preliminary reaction in the premixing tank 2 flows into the sinking area 101 through the liquid flow pipe 12. At the same time, the excessive unreacted carbon dioxide gas also enters the sinking area 101 through the gas flow pipe 13. The carbon dioxide gas entering the sinking area 101 continuously contacts the preliminarily reacted mixed liquid, further reacts, and promotes the formation reaction of lead carbonate to be more complete. This step prolongs the reaction time, makes the formation of lead carbonate more complete, improves the removal rate of lead ions, and reduces the content of residual lead ions in the waste liquid.

[0046] Step 3, precipitation process: Start the second motor 15 at the bottom of the main equipment 1 to drive the spiral blade 16 to rotate. The spiral blade 16 pushes the liquid in the sinking area 101 and the precipitated lead carbonate solids to continuously flow downward and enter the precipitation area 102. In the precipitation area 102, the lead carbonate solids gradually settle by their own gravity, while the liquid containing a small amount of lead carbonate solids flows upward into the upper flow area 103. The pushing effect of the spiral blade 16 accelerates the precipitation process. Compared with traditional static precipitation, it greatly shortens the precipitation time, improves the production efficiency, and does not require a large amount of space, meeting the requirements of modern industrial production.

[0047] Step 4, filtration and liquid diversion: The liquid in the upper flow area 103 is filtered through the filter cartridge 17 and enters the intersection area 104. In the intersection area 104, the liquid close to the spiral blade 16 re-enters the sinking area 101 under the action of the spiral blade 16 to participate in the subsequent precipitation process, and the part of the liquid far from the spiral blade 16 flows upward into the liquid outlet area 105. The filter cartridge 17 filters out the lead carbonate solid particles in the liquid to ensure the quality of the outlet liquid; the diversion design of the liquid in the intersection area 104 forms an internal cycle, further improving the precipitation and filtration effects, and ensuring that the treated liquid meets the discharge standards.

[0048] Step Five: Liquid Discharge Operation: The liquid level sensor 18 monitors the liquid level height in the main device 1 in real time. When the liquid level reaches the discharge standard, that is, when the liquid level exceeds the height of the liquid discharge pipe 19, the liquid discharge pipe 19 is opened to discharge the treated liquid in the liquid discharge area 105 from the main device 1. Automatic liquid discharge control is achieved through liquid level monitoring to ensure the stability and reliability of the equipment operation, ensure the timely discharge of the treated liquid, and avoid the premature discharge of non-compliant liquid.

[0049] Step Six: Carbon Dioxide Recovery: The unreacted carbon dioxide gas in the sinking area 101 moves upward and accumulates in the gas collection area 106 at the top of the main device 1. The air pressure sensor 20 monitors the air pressure in the gas collection area 106 in real time. When the monitored air pressure exceeds the standard, the air flow circulation pipe 21 is opened to recycle the excess carbon dioxide in the main device 1 to the carbon dioxide supply system. This step realizes the recovery and utilization of carbon dioxide, reduces the production cost, and avoids the influence of excessive carbon dioxide on the filtering effect of the filter cartridge 17, ensuring the normal operation and treatment effect of the equipment.

[0050] Lead carbonate is dried and heated to 315 °C to produce lead oxide and carbon dioxide gas. Lead oxide has a wide range of applications in industry and can be used to manufacture lead-acid batteries, ceramics, glass, pigments, catalysts, etc. In the ceramic and glass industries, it can improve the gloss and refractive index of products. In pigments, it can be used as a raw material for yellow pigments. In the field of catalysts, it has a catalytic effect on certain chemical reactions. This enables the waste gas products from the treatment of lead-containing wastewater to have a relatively high economic value.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lead-acid battery production waste liquid treatment and recovery equipment, characterized by: The main device (1) comprises a premixing tank (2) fixedly arranged on the top of the main device (1), wherein the premixing tank (2) is connected to an air inlet pipe (10) and a liquid inlet pipe (11) whose ends extend into the inner bottom area thereof; The main device (1) is internally provided with an inverted cone (5) located below the premixing tank (2); the inner periphery of the inverted cone (5) forms a sinking area (101); the top area of ​​the premixing tank (2) is connected with a liquid flow pipe (12) and an air flow pipe (13) whose ends extend into the sinking area (101); The inner wall of the main device (1) is provided with a baffle ring (6) located at the periphery of the inverted cone (5); a sedimentation area (102) is formed below the baffle ring (6), and an upflow area (103) is formed between the baffle ring (6) and the inverted cone (5); A baffle plate (4) is installed between the main equipment (1) and the premixing tank (2), and an intersection area (104) is formed between the baffle plate (4) and the inverted cone (5). A plurality of filter cartridges (17) are arranged on the top ring side of the inverted cone (5) and are connected to the upstream area (103) and the intersection area (104); A liquid outlet area (105) and a gas collection area (106) located above the liquid outlet area (105) are formed above the baffle plate (4); the main device (1) is provided with a liquid outlet pipe (19) connected to the liquid outlet area (105), and an air circulation pipe (21) connected to the gas collection area (106); the main device (1) is provided with a liquid level sensor (18) for monitoring the liquid level in the main device (1), and an air pressure sensor (20) for detecting the air pressure in the gas collection area (106); The main device (1) is provided with a second motor (15) at the bottom and a spiral blade (16) inside for driving the liquid downward, wherein the spiral blade (16) is fixedly connected to the output end of the second motor (15); The bottom of the inverted cone (5) is provided with a sinking opening (501), and the spiral blade (16) moves through the sinking opening (501) and penetrates the sinking area (101) and the sedimentation area (102).

2. A lead-acid battery production waste liquid treatment and recovery equipment according to claim 1, characterized in that: A first motor (7) is disposed on the top of the premixing tank (2), and a first rotating shaft (8) drivingly connected to the first motor (7) and a stirring blade (9) fixed to the side of the first rotating shaft (8) are disposed inside the premixing tank (2); The air inlet pipe (10) and the liquid inlet pipe (11) extending into the premixing tank (2) are located outside the rotation range of the stirring blade (9).

3. The lead-acid battery production waste liquid treatment and recovery equipment according to claim 1 is characterized by: The main equipment (1) is provided with an inner top frame (3) for fixing the premixing tank (2), and the baffle plate (4) is located below the inner top frame (3).

4. The lead-acid battery production waste liquid treatment and recovery equipment according to claim 1, characterized in that: The horizontal position of the communication port between the air flow pipe (13) and the premixing tank (2) is higher than the horizontal position of the communication port between the liquid flow pipe (12) and the premixing tank (2).

5. The lead-acid battery production waste liquid treatment and recovery equipment according to claim 1, characterized in that: An upstream channel (401) communicating with the intersection area (104) is provided at the middle of the bottom of the baffle plate (4), and the communication port of the liquid outlet pipe (19) and the main equipment (1) is located directly above the upstream channel (401).

6. The lead-acid battery production waste liquid treatment and recovery equipment according to claim 1, characterized in that: The horizontal position of the ends of the air inlet pipe (10) and the liquid inlet pipe (11) extending into the sinking area (101) is lower than the horizontal position of the highest point of the spiral blade (16).

7. The lead-acid battery production waste liquid treatment and recovery equipment according to claim 1 is characterized by: The radius of the spiral blade (16) gradually decreases from top to bottom, and the radius of the sinking opening (501) is greater than the radius of the spiral blade (16) at the horizontal height where the sinking opening (501) is located.

8. The lead-acid battery production waste liquid treatment and recovery equipment according to claim 1, characterized in that: A slag discharge pipe (22) and a maintenance standby pipe (23) connected to the sedimentation area (102) are provided at the bottom of the main equipment (1); The air inlet pipe (10), the liquid inlet pipe (11), the liquid outlet pipe (19), the air circulation pipe (21), the slag discharge pipe (22), and the maintenance standby pipe (23) are all provided with on-off valves.

9. A waste liquid treatment and recovery method applied to the lead-acid battery production waste liquid treatment and recovery equipment according to any one of claims 1 to 8, characterized in that: The following contents are included: Step 1: introducing an excess amount of carbon dioxide gas flow into the bottom of the premixing tank (2) through the gas inlet pipe (10), while introducing the lead-acid battery production waste liquid into the bottom of the premixing tank (2) through the liquid inlet pipe (11), and mixing and stirring the carbon dioxide gas flow and the waste liquid in the premixing tank (2); Step 2: The mixed liquid after the initial reaction in the premixing tank (2) flows into the sinking area (101) through the liquid flow pipe (12), and at the same time, the excess unreacted carbon dioxide gas also enters the sinking area (101) through the gas flow pipe (13); The carbon dioxide gas entering the sinking zone (101) is in continuous contact with the mixed liquid of the preliminary reaction, and further reacts to promote a more complete reaction of forming lead carbonate; Step 3: starting the second motor (15) at the bottom of the main device (1) to drive the spiral blade (16) to rotate, and the spiral blade (16) pushes the liquid in the sinking area (101) and the precipitated lead carbonate solid to continue to flow downward and enter the precipitation area (102); In the precipitation zone (102), the lead carbonate solids gradually settle, while the liquid containing a small amount of lead carbonate solids flows upward into the upflow zone (103); Step 4: The liquid in the upstream area (103) is filtered through the filter cartridge (17) and then enters the intersection area (104); In the intersection area (104), the liquid close to the spiral blade (16) is acted upon by the spiral blade (16) to enter the sinking area (101) again and participate in the subsequent sedimentation process, while part of the liquid away from the spiral blade (16) flows upward and enters the liquid outlet area (105); Step 5: The liquid level sensor (18) monitors the liquid level in the main device (1) in real time. When the liquid level reaches the discharge standard, that is, the liquid level exceeds the height of the liquid outlet pipe (19), the liquid outlet pipe (19) is opened to discharge the treated liquid in the liquid outlet area (105) out of the main device (1); Step 6: The unreacted carbon dioxide gas in the sinking area (101) moves upward and gathers in the gas collecting area (106) in the top area of ​​the main equipment (1); The air pressure sensor (20) monitors the air pressure of the gas collection area (106) in real time. When it is detected that the air pressure exceeds the standard, the air circulation pipe (21) is opened to return the excess carbon dioxide in the main device (1) to supplement the carbon dioxide supply system.

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