A nuclear crystallization granulation device for the efficient recovery of heavy metal manganese

Abstract

The present invention provides a nuclear crystal granulation device for efficiently recovering heavy metal manganese, comprising a vertical outer cylinder and an inner cylinder, wherein the inner cylinder is located in the outer cylinder, and there is space between the top, bottom, and sides of the outer cylinder; the inner cylinder is connected to a seed adding hopper, and a central stirring system is arranged in the inner cylinder; the water inlet and the drug inlet of the nuclear crystal granulation device are arranged at the bottom of the inner cylinder; the water outlet of the nuclear crystal granulation device comprises an outer cylinder water outlet at the top of the outer cylinder and an inner cylinder water outlet at the top of the inner cylinder; the seed discharge port of the nuclear crystal granulation device comprises an outer cylinder seed discharge port at the bottom of the outer cylinder and an inner cylinder seed discharge port at the bottom of the inner cylinder, and the outer cylinder seed discharge port and the inner cylinder seed discharge port are externally connected by a detachable pipeline; the detachable pipeline is connected when the device is in operation and is disassembled when discharging the seed. The present invention overcomes the shortcomings of the current method for removing manganese ions from wastewater, such as large floor space occupation, lengthy process flow, and large investment.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purification, and relates to a water treatment device for removing and recovering heavy metals from acidic wastewater containing heavy metals, and in particular to a nucleus crystal granulation device for efficiently recovering heavy metal manganese. Background Art

[0002] The "three wastes" (waste gas, waste water and waste residue) generated during the production of electrolytic manganese metal have brought environmental pollution to the production site. Among them, the environmental damage caused by waste water is the most serious. The sources of electrolytic manganese waste water mainly come from: a) the preparation of the electrolyte and the two filter press processes containing a large amount of Mn 2+ , ammonia nitrogen, Mg 2+ , Ca 2+ b) Wastewater containing excessive pollutants such as manganese; b) Wastewater generated during the preparation, discharge and passivation of manganese metal in the electrolytic cell, repeated washing of electrode plates and filter cloths; c) A large amount of leachate generated by the accumulation of solid wastes such as electrolytic manganese slag and tailings after being washed by rainwater, which is also an important source of wastewater. These electrolytic manganese wastewaters contain a large amount of soluble manganese (Mn 2+ ), if these electrolytic manganese wastewaters are not treated in a reasonable manner and are allowed to be discharged to the surface indiscriminately, they will cause serious pollution to the soil, surface water and groundwater, and bring about environmental pollution problems.

[0003] Currently, traditional treatment methods for electrolytic manganese wastewater include chemical precipitation, coagulation-precipitation, ferrite precipitation, ion exchange-electrolysis, and biological methods. Chemical precipitation is widely used due to its simplicity and minimal operational steps. This method involves adding an alkaline agent (typically sodium hydroxide or sodium carbonate) to the acidic manganese-containing wastewater to adjust the pH to 11-12, generating a corresponding manganese precipitate to remove manganese from the water. However, this method produces a large amount of loose manganese-containing hazardous sludge, requiring the addition of flocculants to improve settling properties for subsequent treatment. Furthermore, the resulting precipitate is complex in composition and difficult to recycle, resulting in unnecessary waste of manganese resources. Furthermore, adjusting the effluent pH to an excessively high pH requires the consumption of additional acid and large amounts of coagulant, which exponentially increases operating costs. Furthermore, the equipment currently required for manganese ion removal is generally structural, requiring large floor space, lengthy processes, and high investment, placing significant environmental pressures on enterprises. Therefore, in order to address the various defects of the existing traditional electrolytic manganese wastewater treatment, in addition to finding a high-efficiency removal method, it is also necessary to develop and research a short-process, high-efficiency, and recyclable manganese resource wastewater treatment equipment. Summary of the Invention

[0004] In view of the shortcomings of the current method of removing manganese ions from wastewater, which has large floor space, lengthy process flow and large investment, the present invention provides a nuclear crystal granulation device for efficiently recovering heavy metal manganese.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A nucleus crystal granulation device for efficiently recovering heavy metal manganese comprises a vertical outer cylinder and an inner cylinder, wherein the inner cylinder is located within the outer cylinder, and there is space between the top, bottom, and sides of the outer cylinder and the inner cylinder; the inner cylinder is connected to a seed crystal addition hopper, and a central stirring system is arranged in the inner cylinder;

[0007] The water inlet and the drug inlet of the core crystal granulation device are arranged at the bottom of the inner cylinder; the water outlet of the core crystal granulation device includes an outer cylinder water outlet at the top of the outer cylinder and an inner cylinder water outlet at the top of the inner cylinder; the seed crystal discharge outlet of the core crystal granulation device includes an outer cylinder seed crystal discharge outlet at the bottom of the outer cylinder and an inner cylinder seed crystal discharge outlet at the bottom of the inner cylinder, and the outer cylinder seed crystal discharge outlet and the inner cylinder seed crystal discharge outlet are externally connected by a detachable pipeline; the detachable pipeline is connected when the device is in operation and is detached when discharging seeds.

[0008] In one embodiment, a water inlet pipe and a drug inlet pipe are provided on the outer side of the bottom of the outer cylinder. The water inlet pipe extends to the inner cylinder and is connected to the water inlet; the drug inlet pipe extends to the inner cylinder and is connected to the drug inlet.

[0009] In one embodiment, there are one or two water inlets, and one or two drug inlets, so as to be suitable for manganese-containing wastewater with different concentrations; the water inlet and the drug inlet are evenly distributed at the bottom of the device and are evenly spaced along the circumference. The water inlet is tangential water inlet, and the drug inlet is tangential drug inlet.

[0010] In one embodiment, the height of the clarification zone between the top of the inner tube and the water outlet of the outer tube is 20-120 cm.

[0011] In one embodiment, the outer cylinder and the inner cylinder are fixedly connected by inner and outer cylinder connecting brackets to ensure the stability of the inner cylinder during operation. The number of the inner and outer cylinder connecting brackets is determined according to the specific water quality and water quantity.

[0012] In one embodiment, the seed crystal adding hopper has an angle of 45° to 60° with the horizontal direction, extends from the side of the outer cylinder to the side of the inner cylinder, and extends into the inner cylinder.

[0013] In one embodiment, the outlet of the seed adding hopper connected to the inner cylinder is equipped with an electric valve to prevent the seeds and water from overflowing; the seed adding hopper is equipped with a pressure sensing system to measure the state of the seeds and evaluate whether the seeds need to be replaced.

[0014] In one embodiment, an outer cylinder overflow weir is provided at the top of the outer cylinder, and the outer cylinder water outlet is provided at the outer cylinder overflow weir.

[0015] The present invention also provides a method for efficiently recovering heavy metal manganese, which is achieved by using the nuclear crystal granulation device, and the method is as follows:

[0016] Adding characteristic crystal seeds for manganese ion crystallization into the inner cylinder through the crystal seed adding hopper;

[0017] Manganese-containing wastewater is fed into the inner cylinder from the water inlet, and alkaline reagent is fed into the inner cylinder from the reagent inlet;

[0018] Start the central stirring system to mix the manganese-containing wastewater, alkaline reagent and characteristic crystal seeds evenly, and make the characteristic crystal seeds present a good fluidized state to increase the reaction rate;

[0019] Manganese ions in manganese-containing wastewater crystallize on characteristic seed crystals under the action of alkaline reagents, and the final effluent flows out from the inner tube outlet and / or the outer tube outlet. During the reaction process, a portion of the water flows out of the outer tube from the outer tube seed crystal outlet and circulates into the inner tube from the inner tube seed crystal outlet.

[0020] When the reaction proceeds until the characteristic seed crystals reach a saturated state, the detachable pipeline is disassembled, the manganese-containing crystals are discharged from the seed crystal discharge port of the inner cylinder, and new characteristic seed crystals are re-added to continue the reaction.

[0021] In one embodiment, for high-concentration wastewater, N of the nuclear crystal granulation devices are used in series, and the water outlet of the outer cylinder directly enters the next stage.

[0022] Compared with the existing device for treating acidic manganese-containing wastewater, the beneficial effects of the present invention are:

[0023] 1. Short process flow: The equipment for removing and recovering manganese ions provided by the present invention is an integrated equipment, in which water and drug are fed simultaneously, without the need for other auxiliary coagulation and sedimentation processes, and the overall process flow is simpler and shorter.

[0024] 2. Small equipment footprint and low cost: Chemical precipitation is currently the most widely used treatment process. This method removes manganese from acidic manganese-containing wastewater by adding an alkaline agent (typically sodium hydroxide or sodium carbonate) to adjust the pH to 11-12 to produce a corresponding manganese precipitate. However, this method typically requires structural equipment for manganese ion removal, which occupies a large area, requires a lengthy process, and requires significant investment, placing significant environmental pressure on companies. Compared to traditional structural treatment equipment based on chemical precipitation, the equipment provided by the present invention can save approximately 70% of the floor space, significantly reducing the equipment footprint while also lowering the equipment cost.

[0025] 3. High adaptability and can be used in multi-stage series: The device of the present invention can be flexibly selected according to actual treatment needs, and can be enlarged or reduced, or used in multi-stage series to be suitable for manganese-containing acidic wastewater with different water volume and quality, with better treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification of the present invention. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 This is the working principle diagram of water intake / drug addition / circulating water intake of the present invention. After the water in the inner cylinder flows into the outer cylinder, it flows into the inner cylinder from the outer cylinder through the circulating pump. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be noted that the embodiments described below are only some embodiments of the present invention, rather than all embodiments. The specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of the present invention.

[0030] The present invention provides a nuclear crystal granulation device for efficiently recovering heavy metal manganese. Figure 1 As shown, it mainly comprises an outer tube 1 and an inner tube 2. Both outer tube 1 and inner tube 2 are vertically arranged cylindrical structures. Inner tube 2 is located in outer tube 1. There is a certain distance between the top of outer tube 1 and the top of inner tube 2, the inner sidewall of outer tube 1 and the outer sidewall of inner tube 2, and the bottom of outer tube 1 and the bottom of inner tube 2. In other words, inner tube 2 is suspended from outer tube 1. As is easy to understand, the two are preferably arranged coaxially.

[0031] The inner cylinder 2 is connected to a seed crystal adding hopper 3, which is used to add characteristic seed crystals for manganese ion crystallization into the inner cylinder 2. In the present invention, a central stirring system 4 is arranged in the inner cylinder 2.

[0032] The water inlet 5 and the drug inlet 6 of the core crystal granulation device of the present invention are arranged at the bottom of the inner cylinder 2; the core crystal granulation device has two water outlets, namely the outer cylinder water outlet 10 at the top of the outer cylinder 1 and the inner cylinder water outlet 9 at the top of the inner cylinder 2. The core crystal granulation device has two seed discharge outlets, namely the outer cylinder seed discharge outlet 7 at the bottom of the outer cylinder 1 and the inner cylinder seed discharge outlet 8 at the bottom of the inner cylinder 2. The outer cylinder seed discharge outlet 7 and the inner cylinder seed discharge outlet 8 are externally connected by a detachable pipeline, that is, the inner cylinder seed discharge outlet 8 serves as the circulating water inlet and the outer cylinder seed discharge outlet 7 serves as the circulating water outlet, and the two are in a connected relationship during operation. The detachable pipeline of the present invention refers to a pipeline that is connected during the operation of the device (during the core crystal granulation process) to achieve circulating water backflow and is detached when discharging seeds to discharge characteristic seeds that have reached a saturated state from the seed discharge outlet.

[0033] According to this structure, after the reaction, wastewater flows from the top of inner drum 2 to outer drum 1, passes through the outer drum circulation pump and other power components, and then re-enters inner drum 2 for reaction. Finally, the crystals are discharged from inner drum 2 and outer drum 1. Utilizing this device, manganese ions in water can be precipitated as crystals. Compared with the traditional method of removing manganese ions by chemical precipitation, which requires lengthy structures, this device shortens the manganese ion removal process and makes it more efficient. It reduces floor space by over 70%, reduces energy consumption, and reduces carbon emissions during the manganese ion removal process.

[0034] In this embodiment of the present invention, the water inlet and drug inlet pipes of the core crystal granulation device extend from the bottom outside of the outer tube 1 to the inner tube 2. The water inlet pipe is connected to the water inlet 5, and the drug inlet pipe is connected to the drug inlet 6. For high-concentration wastewater, multiple devices can be used in series. The water at the outer tube outlet 10 can be directly discharged or fed to the next stage.

[0035] In the embodiment of the present invention, the inner and outer drum circulation ratio is (1-10):1. This "inner and outer drum circulation ratio" refers to the ratio of the amount of water circulated from the outer drum 7 into the circulation water inlet by the circulation pump to the amount of water entering the water inlet 5. The circulation ratio is determined based on the manganese ion concentration in the water. Theoretically, the higher the manganese ion concentration in the inlet water, the higher the circulation ratio.

[0036] In the embodiments of the present invention, one or two water inlets 5 and one or two drug inlets 6 are provided to accommodate manganese-containing wastewaters of varying concentrations. The water inlets 5 and drug inlets 6 are evenly distributed at the bottom of the device and spaced evenly around the circumference. To optimize internal flow patterns, the water inlet 5 and drug inlet 6 are tangentially fed.

[0037] The purpose of this embodiment is to optimize the flow pattern within the inner cylinder as much as possible. On the one hand, tangential water and drug inlet flow is selected, and on the other hand, the water inlet 5 and drug inlet 6 are evenly distributed. For example, when there is only one water inlet 5 and one drug inlet 6, the two are arranged opposite each other, that is, at right angles. When there are three water inlets 5 and three drug inlets 6, the angle between them is 120°. When there are two water inlets 5 and two drug inlets 6, they are spaced apart, with the angle between adjacent inlets being 90°, and so on.

[0038] In the embodiment of the present invention, the height difference between the inner tube 2 and the outer tube 1, that is, the height of the clarification zone between the top of the inner tube 2 and the water outlet 10 of the outer tube, is 20-120 cm.

[0039] Theoretically, the higher the clarification zone, the better the clarification effect and the clearer the water output. However, to optimize the equipment height, the clarification zone of the equipment is adjusted according to the concentration of manganese ions in the water, and different clarification zone heights are set. The height selected in this embodiment takes into account both the water output requirements and the equipment height requirements.

[0040] In an embodiment of the present invention, the outer cylinder 1 and the inner cylinder 2 are fixedly connected by inner and outer cylinder connecting brackets 12 to ensure the stability of the inner cylinder 2 during operation. The number of inner and outer cylinder connecting brackets 12 is determined according to the specific water quality and water quantity.

[0041] This embodiment provides a connection structure between the outer tube 1 and the inner tube 2. The inner and outer tube connecting brackets 12 are generally constructed as horizontal connecting plates or beams. Their sole function is to secure the inner tube 2 to the inner wall of the outer tube 1, ensuring that it does not wobble during operation. Depending on the specific water quality and quantity, the brackets can be arranged in one, two, or three layers, with 2-4 beams per layer.

[0042] In an embodiment of the present invention, the crystal seed adding hopper 3 has an angle of 45°-60° with the horizontal direction, extends from the side of the outer cylinder 1 to the side of the inner cylinder 2 , and extends into the inner cylinder 2 .

[0043] The reason for setting this angle in this embodiment is that since it is connected to the inner cylinder 2, it is convenient to add crystal seeds. If the angle is too small, it is difficult for the crystal seeds to flow directly into the inner cylinder 2. If the angle is too large, the angle will be too large when adding crystal seeds, making it difficult to operate and add them.

[0044] In an embodiment of the present invention, a central stirring system 4 is mounted on the top of the apparatus, with its stirring portion extending into the inner barrel 2. This serves to uniformly mix the incoming water, incoming reagents, and characteristic seed crystals, thereby increasing the reaction rate. For example, the central stirring system 4 rotates at a speed of 20-200 rpm. In some embodiments, when the fluidization level of the seed crystals in the inner barrel meets the required level, the central stirring system 4 may be omitted.

[0045] In this embodiment of the present invention, the effluent is discharged from the inner drum outlet 9, eliminating the use of the outer drum 1 and the need for circulating water inlet and outlet. This embodiment is primarily suitable for operating conditions where the manganese ion concentration in the water is low (e.g., below 2 g / L). In actual applications, different companies have different manganese ion wastewater concentrations. Based on the environmental protection requirements of "near-zero emission," each company will have its own industry requirements. Therefore, the choice of outlet will be adjusted based on the company's requirements for manganese ion concentration in the effluent.

[0046] In an embodiment of the present invention, the outlet of the seed adding hopper 3 connected to the inner cylinder 1 is equipped with an electric valve to prevent the seeds and water from overflowing; the seed adding hopper 3 is equipped with a pressure sensing system to measure the state of the seeds and evaluate whether the seeds need to be replaced.

[0047] In this embodiment, after each seed crystal replacement, the electric valve is closed and does not need to be opened until the next seed crystal replacement. Usually, when the pressure of the pressure sensor is greater than 0.2MPa, it is necessary to judge the seed crystal replacement in combination with the turbidity of the outlet water.

[0048] In an embodiment of the present invention, an outer cylinder overflow weir 11 is provided at the top of the outer cylinder 1 , and the outer cylinder water outlet 10 is provided at the outer cylinder overflow weir 11 .

[0049] The method for efficiently recovering heavy metal manganese by using the nuclear crystal granulation device of the present invention comprises the following steps:

[0050] Characteristic seed crystals for manganese ion crystallization are added into the inner cylinder 2 through the seed crystal adding hopper 3 .

[0051] In the present invention, the reason for targeting manganese ions is that the precipitation characteristics (solubility product) of manganese ions are adjusted to a high degree. For example, when the manganese ion concentration is less than 10 g / L and the water flow rate is less than 5 m 3 When the device is operated at a rate of 1000 rpm and 1000 rpm, the inner cylinder diameter of the device is 10-150 cm, and the outer cylinder diameter is 20-240 cm. Due to the different solubility products of different metal ions, the pH required for their precipitation varies. It is easy to understand that different seed crystals can be used for different metal ions.

[0052] Manganese-containing wastewater is fed into the inner tube 2 through the water inlet 5, and an alkaline agent is fed into the inner tube 2 through the agent inlet 6. Depending on the concentration of manganese ions in the wastewater, the alkaline agent can be sodium carbonate or sodium hydroxide, or a mixture of sodium carbonate and sodium hydroxide in different proportions.

[0053] The central stirring system 4 is started to mix the manganese-containing wastewater, alkaline agent and characteristic crystal seeds evenly, and the characteristic crystal seeds are made to present a good fluidized state to increase the reaction rate. The manganese ions in the water are crystallized on the characteristic crystal seeds under the action of the alkaline agent.

[0054] Under the action of the alkaline agent, the manganese ions in the manganese-containing wastewater crystallize on the characteristic seed crystals. The final effluent flows out through the inner tube outlet 9 and / or the outer tube outlet 10, with the manganese ion content significantly reduced. During the reaction, a portion of the water flows out of the outer tube 1 through the outer tube seed crystal outlet 7 and circulates back into the inner tube 2 through the inner tube seed crystal outlet 8.

[0055] After the reaction has proceeded for a period of time, the characteristic seed crystals reach saturation, and their ability to crystallize manganese ions decreases. At this point, the detachable piping is removed, and the manganese-containing crystals are discharged from the inner barrel seed crystal outlet 8. New characteristic seed crystals are then added, and the reaction continues. The manganese-containing crystals can then be used as raw material for electrolytic manganese in the front end. After prolonged operation, the outer barrel will inevitably contain seed crystals that have been flushed through the inner barrel. These crystals can then be discharged through the outer barrel seed crystal outlet 7.

[0056] Experiments have demonstrated that the present invention can efficiently treat and recover manganese ions from high-manganese-content wastewater, crystallizing the manganese ions into dense crystals. The manganese ion leaching rate in the crystals exceeds 99%, the grade is greater than 45% (based on the ore), and the moisture content is less than 5%, as shown in the table below. Furthermore, the crystals can be directly reused in the production line to produce manganese sulfate, thereby increasing enterprise profitability.

[0057]

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A nuclear crystal granulation device for efficiently recovering heavy metal manganese, characterized in that: The invention comprises a vertically arranged outer cylinder (1) and an inner cylinder (2), wherein the inner cylinder (2) is located in the outer cylinder (1), and there is space between the top, bottom and sides of the outer cylinder (1); the inner cylinder (2) is connected to a seed crystal addition hopper (3), and a central stirring system (4) is arranged in the inner cylinder (2); The water inlet (5) and the drug inlet (6) of the core crystal granulation device are arranged at the bottom of the inner cylinder (2); the water outlet of the core crystal granulation device includes an outer cylinder water outlet (10) at the top of the outer cylinder (1) and an inner cylinder water outlet (9) at the top of the inner cylinder (2); the height of the clarification zone between the top of the inner cylinder (2) and the outer cylinder water outlet (10) is 20-120 cm; when the manganese ion concentration is less than 10 g / L and the water inlet flow rate is less than 5 m 3 / h, the diameter of the inner cylinder (2) is 10-150 cm, and the diameter of the outer cylinder (1) is 20-240 cm; The seed discharge outlet of the nuclear crystal granulation device comprises an outer barrel seed discharge outlet (7) at the bottom of the outer barrel (1) and an inner barrel seed discharge outlet (8) at the bottom of the inner barrel (2), and the outer barrel seed discharge outlet (7) and the inner barrel seed discharge outlet (8) are externally connected via a detachable pipeline; the detachable pipeline is connected when the device is in operation and is detached when discharging seeds.

2. The nuclear crystal granulation device for efficiently recovering heavy metal manganese according to claim 1, characterized in that: A water inlet pipe and a medicine inlet pipe are provided on the outside of the bottom of the outer cylinder (1); the water inlet pipe extends to the inner cylinder (2) and is connected to the water inlet (5); the medicine inlet pipe extends to the inner cylinder (2) and is connected to the medicine inlet (6).

3. The nuclear crystal granulation device for efficiently recovering heavy metal manganese according to claim 1, characterized in that: There are one or two water inlets (5), and one or two drug inlets (6), so as to be applicable to manganese-containing wastewater with different concentrations; the water inlet (5) and the drug inlet (6) are evenly distributed at the bottom of the device and are evenly spaced along the circumference; the water inlet (5) is tangential water inlet, and the drug inlet (6) is tangential drug inlet.

4. The nuclear crystal granulation device for efficiently recovering heavy metal manganese according to claim 1, characterized in that: The outer cylinder (1) and the inner cylinder (2) are fixedly connected by inner and outer cylinder connecting brackets (12) to ensure the stability of the inner cylinder (2) during operation. The number of the inner and outer cylinder connecting brackets (12) is determined according to the specific water quality and water quantity.

5. The nuclear crystal granulation device for efficiently recovering heavy metal manganese according to claim 1, characterized in that: The crystal seed adding hopper (3) has an angle of 45°-60° with the horizontal direction, extends from the side of the outer cylinder (1) to the side of the inner cylinder (2), and extends into the inner cylinder (2).

6. The nuclear crystal granulation device for efficiently recovering heavy metal manganese according to claim 1 or 5, characterized in that: The outlet of the seed adding hopper (3) connected to the inner cylinder (2) is equipped with an electric valve to prevent the seed and water from overflowing; the seed adding hopper (3) is equipped with a pressure sensing system to measure the state of the seed and evaluate whether the seed needs to be replaced.

7. The nuclear crystal granulation device for efficiently recovering heavy metal manganese according to claim 1, characterized in that: An outer cylinder overflow weir (11) is provided at the top of the outer cylinder (1), and the outer cylinder water outlet (10) is provided at the outer cylinder overflow weir (11).

8. A method for efficiently recovering heavy metal manganese, which is achieved by using the nucleus crystal granulation device according to claim 1, and the method is as follows: Adding characteristic crystal seeds for manganese ion crystallization into the inner cylinder (2) through the crystal seed adding hopper (3); Manganese-containing wastewater is fed into the inner tube (2) through the water inlet (5), and alkaline reagent is fed into the inner tube (2) through the reagent inlet (6), with water and reagent being fed simultaneously; Starting the central stirring system (4) to mix the manganese-containing wastewater, alkaline reagent and characteristic seed crystals uniformly, and to make the characteristic seed crystals present a good fluidized state, thereby increasing the reaction rate; Manganese ions in manganese-containing wastewater crystallize on characteristic crystal seeds under the action of alkaline reagents, and the final effluent flows out from the inner tube outlet (9) and / or the outer tube outlet (10). The selection of the outlet is adjusted according to the requirements for the manganese ion concentration in the effluent. When the concentration of manganese ions in the water is low, the water is discharged only from the inner tube water outlet (9); during the reaction process, a portion of the water flows out of the outer tube (1) from the outer tube crystal seed outlet (7) and circulates into the inner tube (2) from the inner tube crystal seed outlet (8); When the reaction proceeds until the characteristic seed crystals reach a saturated state, the detachable pipeline is disassembled, the manganese-containing crystals are discharged from the inner barrel seed crystal outlet (8), and new characteristic seed crystals are added to continue the reaction.

9. The method for efficiently recovering heavy metal manganese according to claim 8, characterized in that: For high-concentration manganese-containing wastewater, N nuclear crystal granulation devices are used in series, and the water outlet (10) of the outer cylinder directly enters the next stage.

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