A method for recycling positive lead paste of lead-acid battery

Abstract

The invention discloses a method for recycling positive lead paste of lead-acid batteries. The invention uses positive lead paste mud generated in the process of applying paste to the positive plate of the lead-acid battery as a raw material, adds ammonium bicarbonate, and reacts under high temperature and pressure conditions, so that the main component of the scrapped positive lead paste mud, lead sulfate, is converted into lead oxide, an active substance of the lead-acid battery. The active substance is easy to generate 4BS and 3BS after acidification, and is reapplied to the production of lead-acid batteries, so as to realize the recycling of scrapped positive lead paste mud, which not only reduces production costs, but also reduces the environmental protection pressure of enterprises. The method of the invention belongs to a semi-dry reaction, which is superior to a wet reactor and is simple and easy to operate. Compared with the method of directly recycling lead paste, the lead paste prepared by the method has better chemical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of lead-acid battery production, and in particular relates to a method for recycling positive lead paste of a lead-acid battery. Background Art

[0002] In the production process of lead-acid battery green plates, the lead paste is applied to the grid through a coating machine in the continuous coating process. The utilization rate of the lead paste is about 98.5% during the production process. A small amount of lead paste mud falls off or is brought into the acid solution during the acid treatment process. Due to the lack of timely utilization, the lead paste mud contains a large amount of PbSO 4 Most manufacturers choose to directly scrap the lead paste mud produced during the pasting process. The lead paste mud is a hazardous solid waste and has the risk of leakage during transportation.

[0003] At present, the main technical difficulty of the secondary lead industry is the treatment and recycling of lead paste. Lead paste contains 50-60% sulfate phase (PbSO 4 ), the reduction smelting temperature is as high as 1200℃, which leads to huge energy consumption in the production process. On the other hand, the high temperature smelting process causes SO 2 A large amount of sulfide volatilizes and precipitates, posing a huge threat to the ecological environment and people's lives.

[0004] Since the 1970s, domestic and foreign research institutions have carried out a lot of research on the "lead paste desulfurization" problem from the perspective of "wet method". The lead paste wet desulfurization process is essentially a liquid-solid reaction process with the formation of a solid product layer. At the actual reaction temperature, the diffusion rate and reaction rate of the material are very slow. Therefore, the inherent mechanism of the lead paste wet desulfurization reaction limits the improvement of its desulfurization efficiency. On the other hand, wet desulfurization usually needs to be carried out in a corrosion-resistant reactor, and requires heating and strong stirring. From the perspective of process stability, the reactor should not be enlarged. Furthermore, due to the high viscosity of the desulfurizer solution, wet desulfurization usually needs to be carried out under high liquid-solid ratio conditions (>4:1), which makes the amount of lead paste added per unit volume of the reactor small. More importantly, under normal process conditions, the lead paste desulfurization rate can only reach 75% to 85%, with about 20% of PbSO 4 Failure to complete the desulfurization reaction will cause great pressure on the subsequent production process. It can be seen that the "wet desulfurization" of lead paste has many problems such as low reaction efficiency, complex process technology, high production cost, and difficulty in large-scale production.

[0005] Therefore, a major issue is to develop a simple process, low cost, high efficiency, and easy lead paste recycling. The patented technology of this invention uses waste lead paste mud to directly produce active 4BS seed crystals. The oxidation degree and particle size can be controlled, which not only solves the pollution, but also has obvious economic and social benefits.

[0006] The invention application with publication number CN109399698A discloses a method for preparing tetrabasic lead sulfate using lead sludge, comprising: (1) pretreatment of lead sludge; (2) determination of the content of lead oxide, free lead and lead sulfate in the lead sludge; (3) preparing tetrabasic lead sulfate batching from the lead sludge; and (4) preparation of tetrabasic lead sulfate. Wherein, step (3) of preparing tetrabasic lead sulfate from acid-leached lead mud: the acid-leached lead mud treated in step (1) is put into a reactor, and lead oxide powder is added according to the content of lead oxide, free lead and lead sulfate in the acid-leached lead mud detected in step (2); the added lead oxide powder and the acid-leached lead mud are added in a manner of first adding a portion of the acid-leached lead mud and then a portion of the lead oxide powder, then adding the remaining acid-leached lead mud, then adding the remaining lead oxide powder, and finally adding water, stirring and mixing to obtain a mixed material; step (4) of preparing tetrabasic lead sulfate: air is continuously introduced into the reactor, the mixed material is stirred and heated, after the reaction is completed, the mixture is stirred and cooled to room temperature, filtered, and the filtrate is returned to step (3) for recycling, the filter cake is collected, dried to a moisture content of less than 0.5%, and the dried sample is crushed to obtain tetrabasic lead sulfate particles. However, in the prior art, firstly, there is no desulfurization, and secondly, the reactor manufacturing requirements are high, the reaction efficiency is low, and the final product tetrabasic lead sulfate content is not high. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for recycling positive electrode lead paste of a lead-acid battery.

[0008] A method for recycling positive lead paste of a lead-acid battery comprises the following steps:

[0009] (1) collecting the positive electrode lead paste mud generated during the positive electrode plate coating process, drying and crushing it, adding ammonium bicarbonate and stirring it evenly to obtain a first lead paste powder;

[0010] (2) steaming the first lead paste powder obtained in step (1), introducing high-pressure steam during the steaming and controlling the steaming conditions to be: pressure of 125 to 140 kPa, temperature of 102 to 108° C., and time of 3 to 4 hours;

[0011] (3) cooling and drying the first lead paste powder after being steamed in step (2) to obtain a second lead paste powder;

[0012] (4) crushing and sieving the second lead paste powder to obtain recycled lead paste powder;

[0013] (5) The recovered lead paste powder obtained in step (4) is used as an additive to prepare a new positive electrode lead paste.

[0014] Preferably, in step (1), the ammonium bicarbonate is added during the crushing of the positive electrode lead paste mud; the addition ratio of the ammonium bicarbonate in step (1) accounts for 0.1% to 0.2% of the mass of the positive electrode lead paste after drying.

[0015] Preferably, in step (1), the drying is performed to a moisture content of ≤0.6%; in step (3), the drying is performed to a moisture content of ≤0.35%; and in step (4), the sieve hole size during sieving is not larger than a 100 mesh sieve.

[0016] Preferably, in order to ensure sufficient reaction of the raw materials, deionized water is sprayed on the first lead paste powder every 30 to 40 minutes during the steaming reaction, and the amount of each spraying is 0.5 to 0.8% of the first lead paste powder by mass percentage.

[0017] Preferably, the amount of the recycled lead paste powder added as an additive in step (5) is 2-5% of the mass of the lead paste and the new lead powder added during the preparation. The new lead powder refers to the recycled lead paste powder that is not recycled by the method of the present application, but is the new lead powder prepared from the lead ingots conventionally used in the production process.

[0018] After the first lead paste powder is crushed in step (1), a collecting box is used to collect the first lead paste powder. The top surface of the collecting box is open and there is a partition plate above the inner bottom surface. The partition plate has a plurality of air holes.

[0019] In step (2), the steaming is performed in a steaming chamber, the bottom surface of the steaming chamber is provided with a placement area for placing the collection box, and a steaming cover that can be raised and lowered is provided above the placement area. After the steaming cover is lowered to the bottom, it forms a closed steaming space with the collection box cover arranged therein together with the bottom surface of the steaming chamber, and a steam pipe for introducing steam into the steaming space is provided on the bottom surface of the placement area or the steaming cover.

[0020] Preferably, a temperature sensor for detecting the temperature in the steaming space and an air pressure sensor for detecting the air pressure in the steaming space are provided on the bottom surface of the placement area or the steaming cover.

[0021] Preferably, the diameter of the pores is 1 mm to 3 mm. The diameter of the pores should not be too large. If the diameter is too large, the lead paste powder will easily fall to the bottom. Of course, a small amount of falling does not affect. The setting of the pores can prevent water from accumulating at the bottom of the lead paste powder in the collection box.

[0022] Preferably, the placement area has a slot which is sealed with the bottom opening of the steaming cover and into which the bottom opening of the steaming cover is inserted.

[0023] Preferably, the bottom surface of the collection box has feet, and the steam pipe is located on the bottom surface of the placement area. The feet prop up the bottom surface of the collection box, so that the bottom surface of the collection box does not fit the bottom surface of the placement area, which is conducive to controlling the temperature of one side of the bottom surface of the collection box.

[0024] Preferably, the inner cavity of the collection box is in the shape of a trumpet with a small bottom and a large top. The trumpet-shaped structure is convenient for collecting lead paste powder.

[0025] Preferably, a side opening is provided on the side of the collecting box, in the area between the inner bottom surface and the interlayer plate, and the position of the side opening is higher than the inner bottom surface. The setting of the side opening can facilitate steam to enter from inside and outside the collecting box in addition to the top opening of the collecting box. Combined with the setting of the air holes, steam can also enter from the bottom, which is conducive to the full reaction of the lead paste powder in the collecting box.

[0026] Preferably, a convex strip is provided on the outer side of the collection box near the top opening for easy transportation.

[0027] The present invention has the following beneficial effects:

[0028] (1) The present invention uses the positive lead paste mud generated during the coating process of the positive plate of the lead-acid battery as a raw material, adds ammonium bicarbonate, and reacts under high temperature and pressure conditions, so that the main component of the scrapped positive lead paste mud, lead sulfate, is converted into lead oxide, an active material of the lead-acid battery. The active material is easy to generate 4BS and 3BS after acidification, and is re-applied to the production of lead-acid batteries, thereby realizing the recycling of scrapped positive lead paste mud, which not only reduces production costs, but also alleviates the environmental protection pressure of enterprises.

[0029] (2) The method of the present invention is a semi-dry reaction, which is superior to a wet reactor and is simple and easy to operate. Compared with the method of directly recycling the lead paste, the lead paste prepared by this method has better chemical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the collection box of this application.

[0031] Figure 2 This is a schematic diagram of the top view of the collection box of this application.

[0032] Figure 3 This is a side structural schematic diagram of the collection box of this application.

[0033] Figure 4 for Figure 3 Cross-sectional view along AA direction.

[0034] Figure 5 It is a side structural schematic diagram of the collection box and the steaming chamber.

[0035] Figure 6 It is a three-dimensional structural schematic diagram of the internal structure of the collection box and the steaming chamber.

[0036] Figure 7 It is a three-dimensional structural schematic diagram of the internal structure of the collection box and the steaming chamber from another perspective.

[0037] Reference numerals:

[0038] Collection box 1, interlayer plate 11, air hole 12, foot 13, side opening 14, convex strip 15;

[0039] The stewing and steaming chamber 2 comprises a placing area 21 , a stewing and steaming cover 22 , a steam pipe 23 , a clamping slot 24 , and a lifting mechanism 25 . DETAILED DESCRIPTION

[0040] Example 1

[0041] like Figures 1 to 7 As shown, a device for recycling positive lead paste of lead-acid batteries, the positive lead paste of lead-acid batteries is positive lead paste mud produced in the process of positive plate coating, the device of the present application comprises a collection box 1 for collecting the positive lead paste mud dried and crushed to obtain lead paste powder, and a steaming chamber 2 for steaming the lead paste powder in the collection box 1.

[0042] like Figures 1 to 4 The collecting box 1 is shown. The top surface of the collecting box 1 is open and there is an interlayer plate 11 above the inner bottom surface. The interlayer plate 11 has a plurality of air holes 12. In a preferred embodiment, the aperture of the air hole 12 is 1 mm to 3 mm. The aperture of the air hole 12 should not be too large. If the aperture is too large, the lead paste powder will easily fall to the bottom. Of course, a small amount of falling does not affect. The setting of the air hole 12 can prevent water from accumulating at the bottom of the lead paste powder in the collecting box 1.

[0043] The inner cavity of the collection box 1 is in the shape of a trumpet with a small bottom and a large top. The trumpet-shaped structure is convenient for collecting lead paste powder. A side opening 14 is provided on the side of the collection box 1, in the area between the inner bottom surface and the interlayer plate 11, and the position of the side opening 14 is higher than the inner bottom surface. The setting of the side opening 14 can facilitate steam to enter from inside and outside the collection box 1 in addition to the top opening of the collection box 1. Combined with the setting of the air hole 12, steam can also enter from the bottom, which is conducive to the full reaction of the lead paste powder in the collection box 1.

[0044] The bottom surface of the collection box 1 is provided with feet 13. The outer side surface of the collection box 1 is provided with a convex strip 15 near the top opening for easy transportation.

[0045] like Figures 5 to 7As shown, the outer frame structure of the stewing and steaming chamber 2 is a box structure with one side opened, the inner bottom surface of the stewing and steaming chamber 2 has a placement area 21 for placing the collection box 1, and a liftable stewing and steaming cover 22 is provided above the placement area 21. After the stewing and steaming cover 22 is lowered to the bottom, it forms a closed stewing and steaming space with the collection box 1 covered therein together with the inner bottom surface of the stewing and steaming chamber 2, and a steam pipe 23 for introducing steam into the stewing and steaming space is provided on the bottom surface of the placement area 21 or the stewing and steaming cover 22. In a preferred embodiment, the steam pipe 23 is located on the bottom surface of the placement area 21. The bottom surface of the collection box 1 is provided with a foot 13, and the foot 13 props up the bottom surface of the collection box 1, so that the bottom surface of the collection box 1 does not fit the bottom surface of the placement area 21, which is conducive to the control of the temperature on one side of the bottom surface of the collection box.

[0046] A temperature sensor for detecting the temperature in the steaming space and an air pressure sensor for detecting the air pressure in the steaming space are provided on the bottom surface of the placement area 21 or the steaming cover 22. Both the temperature sensor and the air pressure sensor are products available on the market, so the structures of the temperature sensor and the air pressure sensor are not shown in the figure.

[0047] The placement area 21 has a card slot 24 that is sealed with the bottom opening of the stewing cover 22 and is inserted into the bottom opening of the stewing cover 22. The provision of the card slot 24 is conducive to maintaining the seal. In actual use, water can be poured into the card slot 24, or after the stewing cover 22 is lowered to the bottom, a sealing strip can be inserted into the card slot 24 on the outer side of the stewing cover 22 to improve the sealing performance.

[0048] The top surface of the outer frame structure of the stewing and steaming chamber 2 is provided with a lifting mechanism 25 for driving the stewing and steaming cover 22 to rise and fall. The lifting mechanism 25 shown in the figure includes a hook driven to rise and fall by a motor, and a hanging ring is correspondingly provided on the top surface of the stewing and steaming chamber 2. The stewing and steaming chamber 2 is hung on the hook through the hanging ring, and the hook is connected to a chain, and the lifting and lowering of the stewing and steaming chamber 2 is realized by controlling the retraction and extension of the chain through the motor.

[0049] The device of the present application can collect the positive electrode lead paste mud generated in the process of positive electrode plate pasting into a collection box 1 after drying and crushing the obtained lead paste powder, and then place the collection box 1 in the placement area 21 of the steaming chamber 2, and the steaming cover 22 above the placement area 21 descends to the bottom to cover the collection box 1, forming a closed steaming space, and then steam is introduced into the steaming space through the steam pipe 23 for steaming treatment, so as to recycle the positive electrode lead paste.

[0050] Example 2

[0051] (1) The scrapped positive lead paste mud generated and collected in the process of continuous coating of lead paste for positive plates of lead-acid batteries is dried to a moisture content of ≤0.6%, firstly subjected to coarse crushing, and ammonium bicarbonate is added at a ratio of 0.10% during crushing and stirred evenly. The scrapped lead mud is collected in a special collection box (Example 1) and allowed to stand for 36 hours for use.

[0052] (2) The collected scrap lead mud is put into a steaming hood (Example 1), steam is introduced into the steaming hood, and the hood is sealed with circulating water on all sides, the sealing pressure is 125 KPa, the temperature is set at 102° C., and the steaming time is 3 hours. The mud is cooled out of the hood (moisture content is 4-7%) and dried in a drying chamber. The mud can be out of the drying chamber only when the moisture content is ≤0.35%.

[0053] (3) The waste lead mud that has been cooled to room temperature after leaving the drying chamber is physically crushed, and the lead mud is collected after being spun through a 100-mesh sieve using a high-speed centrifuge at 1500 rpm.

[0054] The recycled lead mud prepared above is added into the following paste formula at a mass ratio of 2.0% to prepare the paste smear.

[0055] Lead paste formula by mass percentage: antimony trioxide 0.1%, stannous sulfate 0.05%, graphite 0.2%, red lead 4.0%, polyester staple fiber 0.09%, density 1.84g / cm 3 4.7% sulfuric acid, 10.5% water, the balance is lead powder with an oxidation degree of 71% to 77%, and then antimony trioxide, stannous sulfate, graphite, red lead, polyester staple fiber in the above formula are poured into the paste making machine from the upper cover of the weighing system. ① Dry mix for 180s first, ② Add 105kg of water, the water addition time is less than 60s, ③ Wet mix for 360s, ④ Add acid for 13min, acid mix for 4min, ⑤ The paste temperature is 45℃.

[0056] Example 3

[0057] (1) The scrapped positive lead paste mud generated and collected in the process of continuous coating of lead paste for positive plates of lead-acid batteries is dried to a moisture content of ≤0.6%, firstly subjected to coarse crushing, and ammonium bicarbonate is added at a ratio of 0.2% during crushing and stirred evenly. The scrapped lead mud is collected in a special collection box (Example 1) and allowed to stand for 36 hours for use.

[0058] (2) The collected scrap lead mud is put into a steaming hood (Example 1), steam is introduced into the steaming hood, and the hood is sealed with circulating water on all sides. The sealing pressure is 140 KPa, the temperature is set at 108° C., and the steaming time is 4 hours. In order to ensure the full reaction of the raw materials, the scrap lead mud is sprayed with deionized water every 30 minutes during the reaction process, and the amount of each spray is 0.6% (mass percentage) of the scrap lead mud. It is cooled out of the hood (water content 4-7%) and dried in a drying chamber. It can only be out of the drying chamber when the moisture content is ≤0.35%.

[0059] (3) The waste lead mud that has been cooled to room temperature after leaving the drying chamber is physically crushed, and the lead mud is collected after being spun through a 100-mesh sieve using a high-speed centrifuge at 1500 rpm.

[0060] The recycled lead mud prepared above is added into the paste formula and paste smear at a weight ratio of 5.0%.

[0061] The lead paste formula is calculated by mass percentage: 0.1% antimony trioxide, 0.05% stannous sulfate, 0.2% graphite, 4.0% red lead, 0.09% polyester staple fiber, 4.7% sulfuric acid, 10.5% water, and the balance is lead powder with an oxidation degree of 71% to 77%. Then pour the antimony trioxide, stannous sulfate, graphite, red lead, and polyester staple fiber in the above formula from the upper cover of the weighing system into the paste machine. ① Dry mix for 180s first, ② Add 105kg of water, the water addition time is less than 60s, ③ Wet mix for 360s, ④ Add acid for 13min, acid mix for 4min, ⑤ The paste temperature is 45℃.

[0062] Comparative Example 1

[0063] (1) The scrapped positive lead paste mud generated and collected in the continuous coating process of the lead paste of the positive plate of the lead-acid battery is dried in a drying room, and the moisture content is ≤0.6%.

[0064] (2) The scrapped lead mud in the drying room is taken out of the warehouse and cooled to room temperature, and then physically crushed. The lead mud is collected and spun through a 100-mesh sieve using a high-speed centrifuge at 1500 rpm for later use.

[0065] The recycled lead mud prepared above is added into the paste formula and paste smear at a weight ratio of 5.0%.

[0066] The lead paste formula is calculated by mass percentage: 0.1% antimony trioxide, 0.05% stannous sulfate, 0.2% graphite, 4.0% red lead, 0.09% polyester staple fiber, 4.7% sulfuric acid, 10.5% moisture content of the lead paste, and the balance is lead powder with an oxidation degree of 71-77%. Then pour the antimony trioxide, stannous sulfate, graphite, red lead, and polyester staple fiber in the above formula from the upper cover of the weighing system into the paste machine. ① Dry mix for 180s first, ② Add 105kg of water, the water addition time is less than 60s, ③ Wet mix for 360s, ④ Add acid for 13min, acid mix for 4min, ⑤ The paste temperature is 45℃.

[0067] Comparative Example 2

[0068] (1) The positive electrode plate is manufactured according to the existing process technology without adding any lead paste mud.

[0069] The lead paste formula is calculated by mass percentage: 0.1% antimony trioxide, 0.05% stannous sulfate, 0.2% graphite, 4.0% red lead, 0.09% polyester staple fiber, 4.7% sulfuric acid, 10.5% moisture content of the lead paste, and the balance is lead powder with an oxidation degree of 71-77%. Then pour the antimony trioxide, stannous sulfate, graphite, red lead, and polyester staple fiber in the above formula from the upper cover of the weighing system into the paste machine. ① Dry mix for 180s first, ② Add 105kg of water, the water addition time is less than 60s, ③ Wet mix for 360s, ④ Add acid for 13min, acid mix for 4min, ⑤ The paste temperature is 45℃.

[0070] Test Example 1

[0071] The prior art is used to directly reuse the scrapped lead mud after drying and crushing. The composition analysis of the desulfurization product is shown in Table 1.

[0072] Table 1

[0073]

[0074] From Table 1, we can see that

[0075] (1) Using the comparative method to scrap lead mud and directly reuse the dried scrap lead mud is difficult to convert into active material, which will only increase the weight of the plate. Coarse lead sulfate particles will not increase the plate capacity and battery life, which is meaningless and will affect the battery activity.

[0076] (2) The conversion rate of active substances in the lead mud prepared in Example 2 is significantly higher than that in the comparative example, but due to the lack of reaction conditions, the coarse lead sulfate particles cannot be fully reacted.

[0077] (3) The active substance conversion rate of the lead mud prepared in Example 3 is very high, the reaction is relatively complete, the PbO content is greater than 80%, and the dispersion is good and the distribution is uniform.

[0078] Comparative Example 1, Example 2, and Example 3 were prepared by adding 3.0% of scrap lead mud into the positive paste formula to prepare 6-DZF-20 positive plates, and Comparative Example 2 was prepared by using the existing process technology without adding any lead paste mud. The plates of each column were assembled with the negative plates of 6-DZF-20 from the same batch to form lead-acid batteries 6-DZF-20 for electrochemical performance testing, and the results are shown in Tables 2 and 3.

[0079] According to GB / T22199.1-2017, the 2-hour rate capacity, low temperature performance, high current discharge capability and other performance tests of the valve-controlled lead-acid battery 6-DZF-20 for electric power-assisted vehicles. Among them, the unit of low temperature capacity test and high current discharge is minute. Normal temperature capacity unit (ampere-hour)

[0080] Table 2

[0081]

[0082]

[0083] Table 3

[0084]

[0085] The above comparison results show that the lead paste recycled by the methods of Examples 2 and 3 does not deteriorate the initial capacity and cycle number of the battery compared with the case where no recycled lead paste is added in Comparative Document 2. In fact, the lead paste prepared by the method of Example 3 has better performance than that of Comparative Document 2 without adding recycled lead paste. However, in Comparative Example 1, directly adding recycled lead paste that has not been treated by the method of the present invention will cause the battery performance to deteriorate.

Claims

1. A method for recycling positive lead paste of lead-acid batteries, characterized in that: The following steps are involved: (1) collecting the positive electrode lead paste mud generated during the positive electrode plate coating process, drying and crushing it, adding ammonium bicarbonate and stirring it evenly to obtain a first lead paste powder; (2) steaming the first lead paste powder obtained in step (1), introducing high-pressure steam during the steaming and controlling the steaming conditions to be: pressure of 125 to 140 kPa, temperature of 102 to 108° C., and time of 3 to 4 hours; (3) cooling and drying the first lead paste powder after being steamed in step (2) to obtain a second lead paste powder; (4) crushing and sieving the second lead paste powder to obtain recycled lead paste powder; (5) using the recovered lead paste powder obtained in step (4) as an additive to prepare a new positive electrode lead paste, After the first lead paste powder is crushed in step (1), a collecting box is used to collect the first lead paste powder. The top surface of the collecting box is open and there is a partition plate above the inner bottom surface. The partition plate has a plurality of air holes. In step (2), the steaming is performed in a steaming chamber, the bottom surface of the steaming chamber is provided with a placement area for placing the collection box, and a steaming cover that can be raised and lowered is provided above the placement area. After the steaming cover is lowered to the bottom, it forms a closed steaming space with the collection box cover arranged therein together with the bottom surface of the steaming chamber, and a steam pipe for introducing steam into the steaming space is provided on the bottom surface of the placement area or the steaming cover.

2. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: In step (1), the ammonium bicarbonate is added during the crushing of the positive electrode lead paste mud; the addition ratio of the ammonium bicarbonate in step (1) accounts for 0.1% to 0.2% of the mass of the positive electrode lead paste after drying.

3. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: In step (1), the drying is performed to a moisture content of ≤0.6%; in step (3), the drying is performed to a moisture content of ≤0.35%; and in step (4), the sieve hole size during sieving is not larger than a 100 mesh sieve.

4. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: During the steaming process, the first lead paste powder is sprayed with deionized water every 30 to 40 minutes, and the amount of each spraying is 0.5 to 0.8% of the amount of the first lead paste powder in terms of mass percentage.

5. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: In step (5), the amount of recycled lead paste powder added as an additive is 2-5% of the mass of the lead paste and the new lead powder added during the preparation.

6. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: The bottom surface of the placement area or the steaming cover is provided with a temperature sensor for detecting the temperature in the steaming space, and an air pressure sensor for detecting the air pressure in the steaming space.

7. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: The pores have a diameter of 1 mm to 3 mm.

8. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: The inner cavity of the collection box is in the shape of a trumpet with a small bottom and a large top; A side opening is provided on the side of the collection box, in an area between the inner bottom surface and the partition plate, and the position of the side opening is higher than the inner bottom surface; The outer side surface of the collection box is provided with a convex strip near the top opening for easy transportation.

9. The method for recycling positive lead paste of lead-acid battery according to claim 1, characterized in that: The placement area has a slot which is sealed with the bottom opening of the steaming cover and is used for inserting the bottom opening of the steaming cover; The bottom surface of the collecting box is provided with feet, and the steam pipe is located on the bottom surface of the placement area.

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