An electrolytic manganese tailings recovery system

Abstract

This utility model discloses a manganese-containing tailings recovery system for electrolytic manganese, including a manganese recovery system, an ammonia recovery system, and a composite recovery system. The manganese recovery system includes a water washing sedimentation tank; the ammonia recovery system includes a roasting furnace and a first gas collection pipe connected to the roasting furnace, as well as a condensation pipe and an ammonia storage tank; the composite recovery system includes a steel mold press, the discharge pipe of which is divided into two paths, one connected to a calcining furnace; a second gas collection pipe is connected to the calcining furnace, the end of which is connected to a heating oxidation tank, and a packed tower is also provided below the heating oxidation tank; the other path is connected to a crushing and screening machine, which is also connected to a microwave reactor, and the microwave reactor is connected to an ultrasonic generator. This design utilizes the high-temperature calcination of manganese-containing tailings from electrolytic manganese and red mud, employing solid waste co-resource utilization technology, to recycle the manganese-containing tailings from electrolytic manganese as building materials, improving the solidification rate of heavy metals and the decomposition rate of ammonia nitrogen.

Description

Technical Field

[0001] This utility model relates to the field of manganese tailings treatment technology, and in particular to an electrolytic manganese tailings recovery system. Background Technology

[0002] Manganese tailings are solid waste generated during the electrolytic manganese production process. Their complex composition and presence of heavy metals and other pollutants pose a serious threat to the ecological environment if not properly managed. Soluble manganese and ammonia nitrogen in electrolytic manganese tailings leach into groundwater, cyanide causes a surge in water toxicity, heavy metal accumulation damages soil microbial communities, and fluoride affects crop growth. my country has a historically high level of electrolytic manganese slag stockpiles, occupying a large area of ​​land, posing a significant risk due to their storage.

[0003] In existing technologies, the recycling and treatment of manganese-containing tailings mostly focuses on the extraction and recovery of manganese ions, with limited coverage of the recycling and reuse of other substances. This results in a high leaching rate of heavy metals, and the stockpiling of tailings still poses a significant safety hazard. Therefore, a system is needed that integrates with other waste materials or raw materials for batch processing and recycling, reducing the space occupation and environmental impact of manganese-containing tailings stockpiling. Utility Model Content

[0004] This utility model addresses the technical problem of insufficient recycling of manganese-containing tailings from electrolytic manganese production, which leads to significant space occupation and environmental impact due to the accumulation and storage of manganese-containing tailings. It provides an electrolytic manganese-containing tailings recycling system, comprising a manganese recycling system, an ammonia recycling system, and a composite recycling system. The ammonia recycling system is connected to the manganese recycling system, and the composite recycling system is connected to the ammonia recycling system.

[0005] The manganese recovery system includes a water washing sedimentation tank;

[0006] The ammonia recovery system includes a roasting furnace and a first gas collecting pipe connected to the roasting furnace, as well as a condensation pipe and an ammonia storage tank. The condensation pipe is connected to the first gas collecting pipe and the ammonia storage tank, respectively.

[0007] The composite recycling system includes a steel mold press, the discharge pipeline of which is divided into two paths, one of which is connected to a calcining furnace; a second gas collection pipeline is connected to the calcining furnace, the end of which is connected to a heating oxidation tank, and a packed tower is provided below the heating oxidation tank.

[0008] Another path is connected to a crushing and screening machine, which is also connected to a microwave reactor, which is connected to an ultrasonic generator, and the ultrasonic generator is connected to a drying device.

[0009] A cooling box is provided on one side of the calcining furnace, and the cooling box is connected to a soaking tank.

[0010] Preferably, in the above technical solution, the water washing sedimentation tank is equipped with a stirring device and a vacuum belt filter.

[0011] Preferably, in the above technical solution, the steel mold pressing machine is equipped with a sorting and screening device, which is used to separate the pressed block solids from the fragments.

[0012] Preferably, in the above technical solution, the top of the ultrasonic generator is provided with a dosing window, and the dosing window is connected to the interior of the ultrasonic generator.

[0013] Preferably, in the above technical solution, a demister is provided inside the top of the packed tower, and a polytetrafluoroethylene filter layer is provided inside the demister.

[0014] Preferably, in the above technical solution, the drying device is equipped with a filter cake.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention utilizes a composite ceramic formed by calcining electrolytic manganese tailings and red mud at high temperatures. Through solid waste co-resource utilization technology, it recycles electrolytic manganese tailings into building materials, thereby improving the solidification rate of heavy metals and the decomposition rate of ammonia nitrogen.

[0017] This invention utilizes electrolytic manganese tailings and red mud to calcine at high temperatures, where sulfur undergoes catalytic oxidation at a certain temperature. The mixture is then passed through a packed tower where gas-liquid countercurrent contact increases the mass transfer area. A demister at the top of the packed tower captures the acid mist generated during the reaction, ultimately producing liquid sulfuric acid, thus achieving the recovery and reuse of sulfur.

[0018] This invention involves crushing and screening agglomerated manganese-containing tailings particles from residual electrolytic manganese production. The aluminosilicates, metal oxides, and potassium hydroxide solution are mixed and reacted separately under microwave conditions. The products then undergo a further etching reaction under ultrasonic conditions, and after filtration, form a porous adsorbent. This process converts soluble heavy metals into stable precipitates, reducing environmental risks. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an electrolytic manganese tailings recovery system according to the present invention;

[0020] Figure 2 This is a process flow diagram of an electrolytic manganese tailings recovery system according to the present invention.

[0021] Explanation of key figure labels:

[0022] 1-Water washing sedimentation tank, 2-Roasting furnace, 3-First gas collection pipeline, 4-Condensation pipeline, 5-Ammonia storage tank, 6-Steel mold pressing machine, 7-Pulverizer and screening machine, 8-Microwave reactor, 9-Calcination furnace, 10-Second gas collection pipeline, 11-Ultrasonic generator, 12-Cooling box, 13-Heating oxidation tank, 14-Drying device, 15-Soaking tank, 16-Packed tower, 101-Stirring device, 102-Vacuum belt filter, 601-Classification and screening device, 1101-Dosing window, 1401-Filter cake, 1601-Demister, 1602-Polytetrafluoroethylene filter layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-2 As shown, this utility model discloses an electrolytic manganese tailings recovery system, comprising a manganese recovery system, an ammonia recovery system, and a composite recovery system. The ammonia recovery system is connected to the manganese recovery system, and the composite recovery system is connected to the ammonia recovery system. The manganese recovery system includes a water washing sedimentation tank 1. The water washing sedimentation tank 1 is equipped with a stirring device 101 and a vacuum belt filter 102. The stirring device 101 can fully mix soluble manganese with clean water, and then an appropriate amount of ammonium salt is added according to the amount of mixture to generate manganese carbonate precipitate. Finally, the precipitate is filtered by the vacuum belt filter 102 to obtain manganese carbonate, which can be further processed and treated to meet the needs of other industrial applications, thereby realizing the recovery and reuse of manganese ions. The ammonia recovery system includes a roasting furnace 2 and a first gas collecting pipe 3 connected to the roasting furnace 2, as well as a condensation pipe 4 and an ammonia storage tank 5. The condensation pipe 4 is connected to the first gas collecting pipe 3 and the ammonia storage tank 5, respectively. The remaining mixture after the manganese ions have been treated is transferred to the roasting furnace 2. Through low-temperature roasting (200–400℃), the manganese-containing tailings of electrolytic manganese and the ammonium salts added in the above operation are decomposed into ammonia gas. The ammonia gas is collected through the first gas collection pipe 3, and then condensed in the condensation pipe 4 to form ammonia water. Finally, it flows into the ammonia water storage tank 5, so as to realize the recovery and utilization of ammonia ions in the manganese-containing tailings of electrolytic manganese.

[0025] In this embodiment, the composite recycling system includes a steel mold pressing machine 6. The discharge pipeline of the steel mold pressing machine 6 is divided into two paths, one of which is connected to a calcining furnace 9. A second gas collecting pipe 10 is connected to the calcining furnace 9, and the end of the second gas collecting pipe 10 is connected to a heating oxidation tank 13. A packed tower 16 is also provided below the heating oxidation tank 13. A demister 1601 is provided inside the top of the packed tower 16, and a polytetrafluoroethylene filter layer 1602 is provided inside the demister 1601. Calcination at 800–1000℃ decomposes calcium sulfate into calcium oxide and sulfur dioxide. The sulfur dioxide enters the heating oxidation tank 13 after passing through the second gas collecting pipe 10, and a catalyst is added to the heating oxidation tank 13 to control the temperature at 410–430℃, so that the sulfur dioxide is oxidized to produce sulfur trioxide. Then, the sulfur trioxide is transported to the packed tower 16 to react with the sulfuric acid solution in the tower. Water is then added to the tower for dilution to produce industrial-grade sulfuric acid. The gas-liquid countercurrent contact increases the mass transfer area. The demister 1601 and the polytetrafluoroethylene filter layer 1602 in the demister 1601 are installed at the top of the packed tower 16 to capture acid mist, so that the sulfur element can react as much as possible and avoid material consumption and waste.

[0026] In this embodiment, the steel mold pressing machine 6 is equipped with a sorting and screening device 601, which is used to separate the pressed block solids from the fragments. A cooling box 12 is provided on one side of the calcining furnace 9, and the cooling box 12 is connected to a soaking tank 15. Red mud in a corresponding proportion is added to the remaining mixture to form a dry mixture, and then a binder is added to enhance the strength of the green body. The green body is pressed into a fixed shape by the steel mold pressing machine 6 and then placed into the calcining furnace 9 for high-temperature sintering at 1160–1180°C. This allows the alumina in the red mud to react with the silica and calcium oxide in the manganese-containing tailings from electrolytic manganese ore to form anorthite. The sodium oxide and potassium oxide in the red mud can lower the melting temperature and promote anorthite crystallization. Furthermore, the magnesium ions remaining in the manganese-containing tailings from electrolytic manganese ore react with silica to form enstatite. The calcined reactants are then transferred to a cooling tank 12 to prevent cracking due to phase transformation stress, and then to a soaking tank 15 for 3 hours to stabilize the crystal structure. Anorthite (low coefficient of thermal expansion) and enstatite (high hardness) form an interlocking structure, improving flexural strength. Thus, elements such as lead and chromium remaining in manganese-containing tailings from electrolytic manganese are encapsulated by the anorthite-enstatite multiphase structure, significantly reducing leaching toxicity, making it suitable for use in the processing of building ceramics / refractory materials. Another path connects to a crushing and screening machine 7, which is also connected to a microwave reactor 8. The microwave reactor 8 is connected to an ultrasonic generator 11, which is connected to a drying device 14. The drying device 14 contains a filter cake 1401. The top of the ultrasonic generator 11 has a dosing window 1101, which communicates with the interior of the ultrasonic generator 11. The mixture of agglomerates and granules that could not be compressed into a granular shape is screened into a crushing and screening machine 7 via a sorting and screening device 601. The crushing and screening machine 7 crushes the particles and sieves them to a particle size ≤150μm to increase the specific surface area and promote mass transfer efficiency in subsequent reactions. The crushed mixed particles are then transferred to a microwave reactor 8, and potassium hydroxide solution is added in proportion. The reactor is microwaved at 400-600W for 10-20 minutes to allow the aluminosilicates and metal oxides to react with the potassium hydroxide solution. The potassium hydroxide solution corrodes the aluminosilicate network, dissolves the amorphous phase, and forms micron-sized pores, converting residual manganese and ammonia ions into stable precipitates. The precipitates are then transferred to an ultrasonic generator, and an etchant is added through a dosing window 1101. The reactor is then subjected to a second reaction at a frequency of 21-25kHz, where the etchant dissolves the precipitates and expands the pores. Solid-liquid separation is achieved through a filter cake 1401, and the precipitate is dried in a drying device 14 at 105-120℃ for 2-4 hours to obtain a porous adsorbent. By using ultrasonic synergy technology, the electrolytic manganese tailings can be transformed into high-performance adsorbents through a dual mechanism of "alkali dissolution and pore expansion + cavitation etching", thus achieving high-value treatment of solid waste.

[0027] This invention utilizes a composite ceramic formed by calcining electrolytic manganese-containing tailings and red mud at high temperatures. Employing solid waste co-resource utilization technology, it recycles the electrolytic manganese-containing tailings into building materials, improving the solidification rate of heavy metals and the decomposition rate of ammonia nitrogen. Through high-temperature calcination of the electrolytic manganese-containing tailings and red mud, sulfur undergoes catalytic oxidation at a specific temperature. The resulting product is then passed through a packed tower with countercurrent gas-liquid contact to increase the mass transfer area. A demister at the top of the tower captures the acid mist generated during the reaction, ultimately producing liquid sulfuric acid, thus achieving the recovery and reuse of sulfur. The remaining agglomerated particles of the electrolytic manganese-containing tailings are crushed and screened. The aluminosilicates, metal oxides, and potassium hydroxide solution are mixed and reacted separately under microwave conditions. The products undergo further etching under ultrasonic conditions, and after filtration, form a porous adsorbent. This process converts soluble heavy metals into stable precipitates, reducing environmental risks. With a more complete recycling structure, this system enables more comprehensive recycling and utilization of manganese-containing tailings from electrolytic manganese production. It combines these tailings with other waste materials or raw materials for batch processing, recycling, and reuse, reducing the space occupation and environmental impact of manganese-containing tailings storage. At the same time, it improves the utilization value of manganese-containing tailings from electrolytic manganese production and the production efficiency of enterprises.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for recovering manganese-containing tailings from electrolytic manganese ore, characterized in that: It includes a manganese recovery system, an ammonia recovery system, and a combined recovery system, wherein the ammonia recovery system is connected to the manganese recovery system, and the combined recovery system is connected to the ammonia recovery system; The manganese recovery system includes a water washing sedimentation tank (1); The ammonia recovery system includes a roasting furnace (2) and a first gas collection pipe (3) connected to the roasting furnace (2), and also includes a condensation pipe (4) and an ammonia storage tank (5). The condensation pipe (4) is connected to the first gas collection pipe (3) and the ammonia storage tank (5) respectively. The composite recycling system includes a steel mold press (6), the discharge pipeline of the steel mold press (6) is divided into two paths, one of which is connected to a calcining furnace (9); the calcining furnace (9) is connected to a second gas collection pipe (10), the end of the second gas collection pipe (10) is connected to a heating oxidation tank (13), and a packing tower (16) is also provided below the heating oxidation tank (13). Another path is connected to a crushing and screening machine (7), which is also connected to a microwave reactor (8), which is connected to an ultrasonic generator (11), and the ultrasonic generator (11) is connected to a drying device (14). A cooling box (12) is provided on one side of the calcining furnace (9), and the cooling box (12) is connected to a soaking pool (15).

2. The electrolytic manganese manganese-bearing tailings recovery system of claim 1, wherein: The water washing sedimentation tank (1) is equipped with a stirring device (101) and a vacuum belt filter (102).

3. The electrolytic manganese manganese-bearing tailings recovery system of claim 1, wherein: The steel mold pressing machine (6) is equipped with a sorting and screening device (601), which is used to separate the pressed block solids from the fragments.

4. The electrolytic manganese manganese-bearing tailings recovery system of claim 1, wherein: The top of the ultrasonic generator (11) is provided with a drug dosing window (1101), which is connected to the interior of the ultrasonic generator (11).

5. The electrolytic manganese tailings recovery system according to claim 1, characterized in that: The top of the packed tower (16) is provided with a demister (1601), and the demister (1601) is provided with a polytetrafluoroethylene filter layer (1602).

6. The electrolytic manganese manganese-bearing tailings recovery system of claim 1, wherein: The drying device (14) contains a filter cake (1401).

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