Harmless and resource-based recovery system for manganese slag leachate

Abstract

This utility model discloses a harmless and resource-based recovery system for manganese slag leachate, comprising a first storage tank for storing electrolytic manganese slag leachate, and sequentially connected to it a reaction tank, a first filter, an ultrafiltration device, a first circulation tank, a second filter, a degassing membrane device, a second circulation tank, a third filter, a third storage tank, and an evaporation crystallization device. First, second, third, and fourth reagent tanks are connected to the reaction tank. In this utility model, under the combined action of the reaction tank, the first filter, the ultrafiltration device, the second filter, the degassing membrane device, the third filter, and the evaporation crystallization device, metal ions in the leachate can be efficiently removed, and ammonia nitrogen in the leachate can be converted into high-value, high-purity ammonium sulfate products. This system achieves harmless and resource-based treatment of electrolytic manganese slag leachate, and has advantages such as simple connection structure, low equipment cost, high treatment efficiency, good treatment effect, and high economic benefits. It has high use value and good application prospects.

Description

Technical Field

[0001] This utility model belongs to the field of leachate treatment of electrolytic manganese slag, and relates to a harmless and resource-based recovery system for manganese slag leachate, specifically a harmless and resource-based recovery system for electrolytic manganese slag leachate. Background Technology

[0002] Existing technologies for the harmless treatment and resource recovery of leachate from electrolytic manganese slag mainly involve forming precipitates through precipitation reactions, separating metal ions from the leachate through solid-liquid separation, and then separating ammonia nitrogen from the leachate using an ammonia removal membrane device. This achieves the harmless treatment and resource recovery of the leachate. For example, some researchers have proposed a method for treating and recovering manganese, magnesium, and ammonium from electrolytic manganese slag leachate. This method involves sequentially treating the leachate with carbonates, phosphates, lime, and sodium carbonate, converting manganese, magnesium, ammonium, and calcium in the leachate into manganese carbonate, magnesium ammonium phosphate, calcium magnesium manganese slag, and industrial calcium carbonate. Solid-liquid separation effectively removes heavy metal ions from the leachate, and the collected filtrate after solid-liquid separation undergoes membrane ammonia removal treatment to ensure the wastewater meets discharge standards and recovers industrial ammonium sulfate. In the above-mentioned treatment methods, at least four sets of sedimentation reaction tanks and separation devices are required to effectively remove manganese, magnesium, ammonium, and calcium from the leachate. This results in a complex connection structure, high equipment cost, difficult operation, low treatment efficiency, and difficulty in quickly purifying the leachate. In addition, directly using a membrane deammoniation system to treat the filtrate collected after solid-liquid separation can lead to damage to the deammoniation membrane by suspended particles, colloids, and other large molecules during the membrane deammoniation process. This can also interfere with the membrane's separation of ammonia nitrogen, resulting in poor deammoniation performance or increased maintenance and replacement costs, ultimately leading to a significant increase in the cost of membrane deammoniation treatment. Furthermore, the lack of a circulation pipeline in the membrane deammoniation system not only makes it difficult to effectively separate ammonia nitrogen from the leachate, but also results in a low concentration of ammonium sulfate in the ammonium sulfate solution formed after sulfuric acid absorption of ammonia. This is not conducive to improving the utilization rate of sulfuric acid and can also easily increase the amount of subsequent evaporation and crystallization, leading to higher ammonium sulfate recovery costs. Therefore, obtaining a treatment system with simple connection structure, low equipment cost, high processing efficiency, good treatment effect, and high economic benefits is of great significance for realizing the harmless and resource-based recycling of leachate from electrolytic manganese slag. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a harmless and resource-based recycling system for manganese slag leachate with simple connection structure, low equipment cost, high processing efficiency, good processing effect and high economic benefits.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A harmless and resource-based recovery system for manganese slag leachate includes a first storage tank for storing electrolytic manganese slag leachate. The first storage tank is connected in sequence via pipelines to a reaction tank, a first filter, an ultrafiltration device, a first circulation tank, a second filter, and a degassing membrane device. The reaction tank is connected to a first reagent tank for storing hydrogen peroxide, a second reagent tank for storing pH adjuster, a third reagent tank for storing carbonate, and a fourth reagent tank for storing flocculant.

[0006] As a further improvement to the above technical solution: the outlet of the degassing membrane device is connected to the inlet of the first circulation pool through a pipe to form a deammoniation solution circulation pipeline.

[0007] As a further improvement to the above technical solution: a sixth reagent tank for storing alkaline solution is also connected to the inlet of the first circulation tank.

[0008] As a further improvement to the above technical solution: a second storage tank for storing filtrate is also provided on the pipeline between the first filter and the ultrafiltration device.

[0009] As a further improvement to the above technical solution: the first filter is a filter press; the second filter is a ceramic filter.

[0010] As a further improvement to the above technical solution: a second circulation tank is connected to the acid outlet of the degassing membrane device via a pipeline, and the acid outlet of the second circulation tank is connected to the acid inlet of the degassing membrane device to form an acid solution circulation pipeline.

[0011] As a further improvement to the above technical solution: a third filter is connected to the pipeline between the acid outlet of the second circulation tank and the acid inlet of the degassing membrane device; the third filter is a ceramic filter.

[0012] As a further improvement to the above technical solution: a fifth reagent tank for storing sulfuric acid is also connected to the second circulation tank.

[0013] As a further improvement to the above technical solution: a third storage tank for storing ammonium sulfate solution is connected to the product outlet of the second circulation tank; a seventh reagent tank for storing alkaline solution is connected to the third storage tank.

[0014] As a further improvement to the above technical solution: an evaporation crystallization device is connected to the product outlet of the third storage tank; the evaporation crystallization device is an MVR device.

[0015] Compared with the prior art, the advantages of this utility model are: (1) In the harmless and resource-based recovery system for manganese slag leachate of this utility model, a reaction tank, a first filter, an ultrafiltration device, a first circulation tank, a second filter, and a degassing membrane device are sequentially connected to the first storage tank for storing electrolytic manganese slag leachate via pipelines. A first reagent tank for storing hydrogen peroxide, a second reagent tank for storing pH adjuster, a third reagent tank for storing carbonate, and a fourth reagent tank for storing flocculant are connected to the reaction tank. On the one hand, in the reaction tank, metal ions in the electrolytic manganese slag leachate can be oxidized and transformed into large particulate precipitates. On the other hand, in the first filter, metal ions in the leachate can be quickly and effectively removed through simple filtration. Simultaneously, by effectively removing heavy metal ions from the filtrate and optimizing the filtrate… A suitable pH value also helps improve the ammonia nitrogen removal effect and treatment efficiency of the subsequent filtrate, while reducing the solution treatment volume. Furthermore, in the ultrafiltration device, ultrafiltration treatment of the filtrate can effectively remove suspended particles, colloids and other large molecules in the filtrate. Under the action of the second filter, fine particles in the filtrate can be further removed, thus preventing them from clogging the degassing membrane in the degassing membrane device. This can improve the separation effect of the degassing membrane on ammonia nitrogen and extend the service life of the degassing membrane. Finally, the degassing membrane device is used to treat the filtrate after ultrafiltration to remove ammonia nitrogen, thereby quickly and thoroughly separating ammonia nitrogen from the leachate and meeting the relevant discharge requirements, that is, the effluent water quality meets the Class I standard of the "Integrated Wastewater Discharge Standard" (GB 8978-1996). Therefore, with the combined action of the reaction tank, the first filter, the ultrafiltration device, the first circulation tank, the second filter, and the degassing membrane device, metal ions in the leachate can be removed efficiently. At the same time, while improving the service life of the degassing membrane, ammonia nitrogen in the leachate can also be separated quickly and thoroughly, which is conducive to the harmless and resource-based treatment of electrolytic manganese slag leachate.

[0016] (2) In the harmless and resource-based recycling system of manganese slag leachate of this utility model, the outlet of the degassing membrane device is connected to the inlet of the first circulation pool through a pipeline to form a deammoniation solution circulation pipeline. Under the action of the deammoniation solution circulation pipeline, the continuous treatment of manganese slag leachate can be realized, which is conducive to improving the system's treatment capacity and efficiency, as well as reducing treatment costs.

[0017] (3) In the harmless and resource-based recovery system of manganese slag leachate of this utility model, a sixth reagent tank for storing alkaline solution is also connected to the inlet of the first circulation tank. By using alkaline solution to adjust the pH value of the filtrate, it can always maintain strong alkalinity, which is conducive to improving the ammonia nitrogen removal effect of the degassing membrane device and can significantly improve the recovery rate of ammonia nitrogen in the filtrate.

[0018] (4) In the harmless and resource-based recovery system for manganese slag leachate of this utility model, a second circulation tank is connected to the acid outlet of the degassing membrane device via a pipeline. Sulfuric acid is used to absorb the ammonia gas generated in the degassing membrane device, transferring the ammonia nitrogen separated from the leachate to sulfuric acid to form an ammonium sulfate solution. More importantly, the acid outlet of the second circulation tank is connected to the acid inlet of the degassing membrane device to form an acid solution circulation pipeline. Under the action of the sulfuric acid solution circulation pipeline, the remaining sulfuric acid in the ammonium sulfate solution can continuously react with ammonia gas to generate ammonium sulfate, continuously absorbing ammonia gas and significantly increasing the concentration of ammonium sulfate in the solution. Finally, the ammonium sulfate solution is evaporated and crystallized to obtain a high-purity ammonium sulfate product. In addition, a third filter is connected to the pipeline between the acid outlet of the second circulation tank and the acid inlet of the degassing membrane device, which can also effectively remove microparticles, thereby further improving the service life of the degassing membrane device. Therefore, through the combined action of the reaction tank, the first filter, the ultrafiltration device, the first circulation tank, the second filter, the degassing membrane device, the second circulation tank, the third filter, and the evaporation crystallization device, metal ions in the leachate can be efficiently removed, and ammonia nitrogen in the leachate can be converted into high-value, high-purity ammonium sulfate products. This enables the harmless and resource-based treatment of leachate from electrolytic manganese slag. It has the advantages of simple connection structure, low equipment cost, high treatment efficiency, good treatment effect, and high economic benefits, and has high use value and good application prospects. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the harmless and resource-based recovery system for manganese slag leachate in Embodiment 1 of this utility model.

[0021] Figure 2 This is a schematic diagram of the treatment process of manganese slag leachate in Embodiment 1 of this utility model.

[0022] Legend: 101. First storage tank; 102. Second storage tank; 103. Third storage tank; 200. Reaction tank; 201. First reagent tank; 202. Second reagent tank; 203. Third reagent tank; 204. Fourth reagent tank; 205. Fifth reagent tank; 301. First filter; 302. Second filter; 303. Third filter; 400. Ultrafiltration device; 501. First circulation tank; 502. Second circulation tank; 600. Degassing membrane device; 700. Evaporation crystallization device; a. Filter residue; b. Effluent; c. Ammonium sulfate product. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. All materials and instruments used in the following embodiments are commercially available.

[0024] Example 1: like Figure 1 As shown, the harmless and resource-based recycling system for manganese slag leachate in this embodiment includes a first storage tank 101 for storing electrolytic manganese slag leachate. The first storage tank 101 is connected in sequence by pipes to a reaction tank 200, a first filter 301, an ultrafiltration device 400, a first circulation tank 501, a second filter 302, and a degassing membrane device 600. The reaction tank 200 is connected to a first reagent tank 201 for storing hydrogen peroxide, a second reagent tank 202 for storing pH adjuster, a third reagent tank 203 for storing carbonate, and a fourth reagent tank 204 for storing flocculant.

[0025] In this invention's harmless and resource-based recovery system for manganese slag leachate, a reaction tank, a first filter, an ultrafiltration device, a first circulation tank, a second filter, and a degassing membrane device are sequentially connected via pipelines to a first storage tank storing electrolytic manganese slag leachate. Connected to the reaction tank are a first reagent tank storing hydrogen peroxide, a second reagent tank storing pH adjuster, a third reagent tank storing carbonates, and a fourth reagent tank storing flocculants. On one hand, in the reaction tank, metal ions in the electrolytic manganese slag leachate are oxidized and transformed into large particulate precipitates. On the other hand, in the first filter, metal ions in the leachate are quickly and effectively removed through simple filtration. Simultaneously, the system effectively removes heavy metal ions from the filtrate and optimizes the pH of the filtrate. The H value also helps improve the ammonia nitrogen removal effect and treatment efficiency of the subsequent filtrate, while reducing the solution treatment volume. Furthermore, in the ultrafiltration device, ultrafiltration treatment of the filtrate can effectively remove suspended particles, colloids and other large molecules in the filtrate. Under the action of the second filter, fine particles in the filtrate can be further removed, thereby preventing them from clogging the degassing membrane in the degassing membrane device. This can improve the separation effect of the degassing membrane on ammonia nitrogen and extend the service life of the degassing membrane. Finally, the degassing membrane device is used to treat the filtrate after ultrafiltration to remove ammonia nitrogen. This can quickly and thoroughly separate ammonia nitrogen from the leachate and meet the relevant discharge requirements, that is, the effluent water quality meets the Class I standard of the "Integrated Wastewater Discharge Standard" (GB 8978-1996). Therefore, with the combined action of the reaction tank, the first filter, the ultrafiltration device, the first circulation tank, the second filter, and the degassing membrane device, metal ions in the leachate can be removed efficiently. At the same time, while improving the service life of the degassing membrane, ammonia nitrogen in the leachate can also be separated quickly and thoroughly, which is conducive to the harmless and resource-based treatment of electrolytic manganese slag leachate.

[0026] In this embodiment, the outlet of the degassing membrane device 600 is connected to the inlet of the first circulation tank 501 through a pipeline to form a deammoniation solution circulation pipeline. Under the action of this deammoniation solution circulation pipeline, continuous treatment of electrolytic manganese slag leachate can be realized, which is beneficial to improving the system's processing capacity and efficiency, as well as reducing processing costs.

[0027] In this embodiment, the inlet of the first circulation tank 501 is also connected to a sixth reagent tank (not shown in the figure) for storing alkaline solution. By using alkaline solution to adjust the pH value of the filtrate, it is kept strongly alkaline, which is beneficial to improve the ammonia nitrogen removal effect of the degassing membrane device and can significantly improve the recovery rate of ammonia nitrogen in the filtrate.

[0028] In this embodiment, a second storage tank 102 for storing filtrate is also provided on the pipeline between the first filter 301 and the ultrafiltration device 400. The setting of the second storage tank 102 facilitates the circulation and deammoniation treatment of the filtrate.

[0029] In this embodiment, the first filter 301 is a filter press; the second filter 302 is a ceramic filter.

[0030] In this embodiment, the acid outlet of the degassing membrane device 600 is connected to a second circulation tank 502 via a pipeline, and the acid outlet of the second circulation tank 502 is connected to the acid inlet of the degassing membrane device 600 to form an acid solution circulation pipeline.

[0031] In this embodiment, a third filter 303 is connected to the pipeline between the acid outlet of the second circulation tank 502 and the acid inlet of the degassing membrane device 600; the third filter 303 is a ceramic filter.

[0032] In this embodiment, a fifth reagent tank 205 for storing sulfuric acid is also connected to the second circulation tank 502.

[0033] In this embodiment, the product outlet of the second circulation tank 502 is connected to a third storage tank 103 for storing ammonium sulfate solution; the third storage tank (103) is connected to a seventh reagent tank (not shown in the figure) for storing ammonium carbonate.

[0034] In this embodiment, an evaporation crystallization device 700 is connected to the product outlet of the third storage tank 103, wherein the evaporation crystallization device 700 is an MVR device.

[0035] In this invention's harmless and resource-based recovery system for manganese slag leachate, a second circulation tank is connected to the acid outlet of the degassing membrane unit via a pipeline. Sulfuric acid is used to absorb ammonia generated in the degassing membrane unit, transferring the ammonia nitrogen separated from the leachate to the sulfuric acid to form an ammonium sulfate solution. More importantly, the acid outlet of the second circulation tank is connected to the acid inlet of the degassing membrane unit to form an acid solution circulation pipeline. Under the action of this sulfuric acid solution circulation pipeline, the remaining sulfuric acid in the ammonium sulfate solution continuously reacts with ammonia to generate ammonium sulfate, continuously absorbing ammonia and significantly increasing the concentration of ammonium sulfate in the solution. Finally, the ammonium sulfate solution is evaporated and crystallized to obtain a high-purity ammonium sulfate product. Furthermore, a third filter is connected to the pipeline between the acid outlet of the second circulation tank and the acid inlet of the degassing membrane unit, which can effectively remove microparticles, thereby further extending the service life of the degassing membrane unit.

[0036] The harmless and resource-based recycling system of this embodiment, when used to treat leachate from electrolytic manganese slag, has the following process flow diagram: Figure 2 As shown, it includes the following steps: (1) Collect the leachate from the electrolytic manganese slag and store it in the first storage tank 101. Then, input the leachate from the first storage tank 101 into the reaction tank 200 through a pipeline, with the hydrogen peroxide added at a rate of 0.1 L / m³. 3 The process involves adding 0.1 L of hydrogen peroxide per cubic meter of electrolytic manganese slag leachate. Commercially available industrial hydrogen peroxide (27.5% H2O2 concentration) from the first reagent tank 201 is added to the electrolytic manganese slag leachate and stirred. The hydrogen peroxide promotes the oxidation of manganese ions in the leachate to a higher oxidation state, generating a high-valence manganese oxide precipitate. Sodium hydroxide solution from the second reagent tank 202 is added to reaction tank 200, adjusting the pH of the system in reaction tank 200 to 11.8. The carbonate addition rate is 2 kg / m³. 3 Sodium carbonate from the third reagent tank 203 is added to the reaction tank 200, where a precipitation reaction takes place. The mixture is stirred, and under the action of carbonate ions, precipitates such as manganese carbonate, manganese tetroxide, and manganese dioxide are generated. The carbonate addition rate is 0.3 L / m³. 3 A 0.1% polyacrylamide (PAM) solution from the fourth reagent tank 204 is added to the reaction tank 200. Flocculation reaction occurs in the reaction tank 200, causing the particle size of the precipitate to increase, forming large particles and agglomerating, thus promoting sedimentation. The precipitate in the reaction tank 200 is then fed into the first filter 301 (specifically a filter press). The filter press is used to filter the product after the flocculation reaction, obtaining filter residue a and filtrate A. Filtrate A is then fed into the second storage tank 102 for later use.

[0037] In this step, the collected leachate from the electrolytic manganese slag contained 267 mg / L Mn, 193 mg / L NH3-N, and Cr. 6+ The content of Pb is 3.7 mg / L, COD is 67 mg / L, SS is 163 mg / L, and the pH of the leachate from the electrolytic manganese slag is 3.8.

[0038] Tests showed that filtrate A contained 2 mg / L Mn, 186 mg / L NH3-N, and Cr. 6+ The content was 0.5 mg / L, the Pb content was 0.9 mg / L, the COD content was 81 mg / L, and the SS content was 61 mg / L.

[0039] In this step, filter residue a (electrolytic manganese slag) is sent to an electrolytic manganese slag landfill for landfilling.

[0040] (2) Input the filtrate A in the second storage tank 102 into the ultrafiltration device (specifically the ultrafiltration membrane) to perform ultrafiltration treatment on the filtrate A obtained in step (1) to remove suspended particles, colloids and other macromolecular substances in the filtrate, and obtain filtrate B, wherein the filtrate B is input into the first circulation tank 501 for later use.

[0041] (3) The filtrate B in the first circulation tank 501 is subjected to ammonia nitrogen removal treatment until the ammonia nitrogen concentration in the effluent is ≤5mg / L, and filtrate C is obtained, as follows: (3.1) The filtrate B in the first circulation tank 501 is fed into the second filter 302 (specifically a ceramic filter) to filter the filtrate B and remove fine particles.

[0042] (3.2) The filtrate B after being filtered by the second filter 302 is pumped from the inlet to the degassing membrane device. The ammonia removal effect of the degassing membrane is used to separate ammonia nitrogen from the filtrate B and form ammonia gas which enters the other side of the degassing membrane. The effluent from the outlet of the degassing membrane device is returned to the first circulation tank 501 where the filtrate B is located through the pipeline to continue the ammonia nitrogen removal treatment.

[0043] (3.3) Repeat steps (3.1) to (3.2) to circulate and remove ammonia nitrogen from filtrate B until the ammonia nitrogen concentration in the effluent is ≤5mg / L, and obtain filtrate C.

[0044] In step (3), the filtration of filtrate B can also be omitted.

[0045] In step (3), the process of circulating ammonia nitrogen removal also includes: adding the alkaline solution (specifically sodium hydroxide solution) from the sixth reagent tank to the first circulation tank 501 to adjust the filtrate B to be alkaline. By adjusting the filtrate B to be alkaline, the separation effect of ammonia nitrogen in the degassing membrane can be promoted.

[0046] In step (3.2), the pH of filtrate C is adjusted to 7.1 using acid, which is effluent b, meeting the relevant discharge standards and can be directly discharged.

[0047] (4) Add sulfuric acid from the fifth reagent tank 205 to the second circulation tank 502. Use sulfuric acid with a mass fraction of 10% to circulate and absorb the ammonia gas generated during the ammonia nitrogen removal process in step (3) until the mass fraction of ammonium sulfate in the effluent is 18.7%, and obtain an ammonium sulfate solution, specifically: (4.1) The sulfuric acid in the second circulation tank 502 is fed into the third filter 303 (specifically a ceramic filter) to filter the sulfuric acid and remove fine particles.

[0048] (4.2) The sulfuric acid filtered by the third filter 303 is pumped from the acid inlet to the degassing membrane device to absorb the ammonia generated during the circulating ammonia nitrogen removal process. The resulting ammonium sulfate solution (effluent) is discharged from the acid outlet and then returned to the second circulation tank 502 where the sulfuric acid is located through the pipeline to continue to absorb the ammonia generated during the circulating ammonia nitrogen removal process.

[0049] (4.3) Repeat steps (4.1) to (4.2) to circulate and absorb ammonia until the mass fraction of ammonium sulfate in the effluent is 18.7%, and obtain an ammonium sulfate solution, which is stored in the third storage tank 103.

[0050] (5) Add ammonium carbonate from the seventh reagent tank to the third storage tank 103, adjust the pH of the ammonium sulfate solution to 6.1, and input the ammonium sulfate solution after pH adjustment with ammonium carbonate into the evaporation crystallization device 700 (specifically, the MVR device) to evaporate and crystallize the ammonium sulfate solution to produce ammonium sulfate crystals, and obtain ammonium sulfate product c with a purity of 98.3%.

[0051] The results above show that, compared with conventional systems, the harmless and resource-based recovery system for manganese slag leachate of this invention, through the combined action of the reaction tank, the first filter, the ultrafiltration device, the first circulation tank, the second filter, the degassing membrane device, the second circulation tank, the third filter, and the evaporation crystallization device, can efficiently remove metal ions from the leachate and convert ammonia nitrogen in the leachate into high-value, high-purity ammonium sulfate products. This achieves the harmless and resource-based treatment of electrolytic manganese slag leachate, and has advantages such as simple connection structure, low equipment cost, high treatment efficiency, good treatment effect, and high economic benefits. It has high use value and good application prospects.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A harmless and resource recycling system of manganese slag leachate, characterized in that, The system includes a first storage tank (101) for storing leachate from electrolytic manganese slag. The first storage tank (101) is connected in sequence by pipes to a reaction tank (200), a first filter (301), an ultrafiltration device (400), a first circulation tank (501), a second filter (302), and a degassing membrane device (600). The reaction tank (200) is connected to a first reagent tank (201) for storing hydrogen peroxide, a second reagent tank (202) for storing pH adjuster, a third reagent tank (203) for storing carbonate, and a fourth reagent tank (204) for storing flocculant.

2. The innocuity and resource recovery system of leachate of manganese residue according to claim 1, characterized in that, The outlet of the degassing membrane device (600) is connected to the inlet of the first circulation tank (501) through a pipe to form a deammoniation solution circulation pipeline.

3. The innocuity and resource recovery system of leachate of manganese residue according to claim 2, characterized in that, The inlet of the first circulation tank (501) is also connected to a sixth reagent tank for storing alkaline solution.

4. The innocuity and resource recovery system of leachate of manganese residue according to claim 1, characterized in that, A second storage tank (102) for storing filtrate is also provided on the pipeline between the first filter (301) and the ultrafiltration device (400).

5. The innocuity and resource recovery system of leachate of manganese residue according to claim 4, characterized in that, The first filter (301) is a filter press; the second filter (302) is a ceramic filter.

6. The innocuity and resource recovery system of leachate of manganese residue according to any one of claims 1 to 5, characterized in that, The acid outlet of the degassing membrane device (600) is connected to a second circulation tank (502) via a pipe. The acid outlet of the second circulation tank (502) is connected to the acid inlet of the degassing membrane device (600) to form an acid solution circulation pipeline.

7. The system for innocuity and resource recovery of leachate from manganese residue according to claim 6, characterized in that, A third filter (303) is connected to the pipeline between the acid outlet of the second circulation tank (502) and the acid inlet of the degassing membrane device (600); the third filter (303) is a ceramic filter.

8. The system for innocuity and resource recovery of leachate from manganese residue according to claim 6, characterized in that, The second circulation tank (502) is also connected to a fifth reagent tank (205) for storing sulfuric acid.

9. The innocuity and resource recovery system of leachate of manganese residue according to claim 6, characterized in that, The product outlet of the second circulation tank (502) is connected to a third storage tank (103) for storing ammonium sulfate solution; the third storage tank (103) is connected to a seventh reagent tank for storing ammonium carbonate.

10. The innocuity and resource recovery system of leachate of manganese residue according to claim 9, characterized in that, An evaporation crystallization device (700) is connected to the product outlet of the third storage tank (103); the evaporation crystallization device (700) is an MVR device.

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