Harmless treatment system for electrolytic manganese residues

Abstract

The utility model discloses an electrolytic manganese residue innocent treatment system which comprises a ball mill, a magnetic separator, a first filter press, an alkaline washing tank, a second filter press, a second filter press, a drying machine and an ammonia gas treatment device, the magnetic separator is connected with the ball mill, a fine residue outlet of the magnetic separator is connected with a leaching tank, the first filter press is connected with a tailing opening of the magnetic separator, and the alkaline washing tank is connected with the second filter press. A filtrate port of the first filter press is connected with the leaching tank, the alkaline washing tank is connected with a filter residue port of the first filter press, a liquid inlet of the alkaline washing tank is connected with the quick lime digester, the second filter press is connected with the alkaline washing tank, a filtrate port of the second filter press is connected with a liquid inlet of the quick lime digester, and the drying machine is connected with a filter residue port of the second filter press. The ball mill, the alkaline washing tank, the drying machine and the quick lime digester are respectively provided with an ammonia gas absorption port; and the ammonia gas absorption ports are connected with an ammonia gas treatment device. According to the device, manganese and ammonia gas in the electrolytic manganese residues can be effectively recycled, the utilization rate of lime is increased, the treatment cost is reduced, and the treated manganese residues meet the emission requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial solid waste disposal, in particular to a harmless treatment system for electrolytic manganese slag. Background Technique

[0002] Manganese metal is an important industrial raw material, widely used in industries such as metallurgy, chemical industry, light industry, and electronic materials. The most important application is the iron and steel metallurgy industry. At present, manganese metal is mainly obtained by acid leaching manganese ore to obtain manganese salt, which is sent to an electrolytic cell for electrolytic deposition of elemental manganese. Currently, about 7-12t of wet slag is discharged for every 1t of electrolytic manganese produced. The wet slag still contains 1.52% ammonia nitrogen and 2.13% manganese by mass fraction. If the wet slag is directly landfilled or stacked in the environment, it will cause great pollution to the environment and waste of manganese resources. Therefore, it is necessary to scientifically and safely dispose of polluted waste such as manganese slag to achieve the purpose of environmental protection and full utilization of resources.

[0003] A harmless treatment system for electrolytic manganese slag by cyclic alkali washing disclosed in Chinese Patent Publication No. CN220144328U includes an alkali washing stirring tank, a first filter press, a saturated lime water stirring barrel, a lime storage tank, a second filter press, a manganese slag air drying device, and an ammonia gas absorption device. This utility model patent has the advantage of improving the lime utilization rate in the harmless treatment process of electrolytic manganese slag, but it cannot effectively recover the residual manganese resources in the electrolytic manganese slag to achieve the purpose of full utilization of resources. Content of the Utility Model

[0004] The main purpose of the utility model is to overcome the defects existing in the above background technique and provide a harmless treatment system for electrolytic manganese slag.

[0005] To achieve the above object, the harmless treatment system for electrolytic manganese residue proposed by the present utility model includes a ball mill, a magnetic separator, a first filter press, an alkali washing tank, a second filter press, a dryer, and an ammonia treatment device. The electrolytic manganese residue and water enter the ball mill simultaneously for cleaning and grinding. The feed inlet of the magnetic separator is connected to the discharge outlet of the ball mill, and the concentrate slag outlet of the magnetic separator is connected to a leaching tank. The manganese concentrate with a relatively high manganese content is screened out and sent back to the leaching tank in the original electrolytic manganese production process for manganese recovery. The feed inlet of the first filter press is connected to the tail slag outlet of the magnetic separator, and the filtrate outlet of the first filter press is connected to the leaching tank. The filtrate with a relatively high manganese content is sent back to the leaching tank in the original electrolytic manganese production process for manganese recovery. The feed inlet of the alkali washing tank is connected to the filter residue outlet of the first filter press, and the liquid inlet of the alkali washing tank is connected to the liquid outlet of a quicklime slaker. The feed inlet of the second filter press is connected to the discharge outlet of the alkali washing tank, and the filtrate outlet of the second filter press is connected to the liquid inlet of the quicklime slaker. The feed inlet of the dryer is connected to the filter residue outlet of the second filter press. Ammonia absorption ports are provided on the ball mill, the alkali washing tank, the dryer, and the quicklime slaker, and the ammonia absorption ports are connected to the ammonia treatment device. The ammonia generated during the cleaning and grinding of the electrolytic manganese residue in the ball mill, the ammonia generated during the digestion and stirring in the alkali washing tank, the ammonia volatilized during the drying of the dryer, and the ammonia generated when the quicklime slaker uses circulating alkali liquid to digest and produce saturated lime water are all recovered to the ammonia treatment device for treatment and then reused.

[0006] Further optimizing the technical solution, the ball mill adopts an overflow ball mill, and the ammonia absorption ports on the ball mill are respectively arranged at the inlet and outlet of both ends of the ball mill.

[0007] Further optimizing the technical solution, the magnetic separator adopts a wet magnetic separator, and the magnetic field intensity of the magnetic separator reaches between 10000 GS and 15000 GS.

[0008] Further optimizing the technical solution, both the first filter press and the second filter press adopt diaphragm filter presses.

[0009] Further optimizing the technical solution, a stirrer is provided on the alkali washing tank.

[0010] Further optimizing the technical solution, the dryer adopts a drum dryer, and the ammonia absorption port on the dryer is arranged at the air flow outlet.

[0011] Further optimize the technical solution. The ammonia treatment device includes an induced draft fan, an ammonia absorption tower, an ammonia water tank and a water replenishing tank. The air inlet of the induced draft fan is communicated with the ammonia absorption ports on the ball mill, the alkali washing tank, the dryer and the quicklime digester. The air outlet of the induced draft fan is connected to the air inlet of the ammonia absorption tower. The ammonia water tank is connected to the ammonia water outlet of the ammonia absorption tower. The water replenishing tank is connected to the spraying port of the ammonia absorption tower.

[0012] Further optimize the technical solution. Inside the ammonia absorption tower, there are respectively a water storage area, an ammonia storage area, a gas distribution area, an absorption area and an emission area from bottom to top. The water storage area and the ammonia storage area are separated by an anion exchange resin layer. The gas distribution area is provided with a uniform air grid. The air inlet of the ammonia absorption tower is communicated with the uniform air grid. The absorption area is provided with a packing layer. A sprayer is arranged above the packing layer. The sprayer is communicated with the spraying port. The ammonia absorption tower is provided with a tail gas emission port communicated with the external atmosphere at the top of the emission area.

[0013] Further optimize the technical solution. A circulation port is opened on the bottom side wall of the ammonia absorption tower in the water storage area. The circulation port is communicated with the spraying port through a circulation pipe. A circulation pump is arranged on the circulation pipe.

[0014] Further optimize the technical solution. The ammonia water outlet is located on the side wall of the ammonia absorption tower corresponding to the bottom of the ammonia storage area. The ammonia water outlet is communicated with the ammonia water tank through an ammonia water pipe. An ammonia water pump is arranged on the ammonia water pipe.

[0015] The beneficial effects of the present utility model include: by feeding electrolytic manganese residue into a ball mill for grinding and cleaning, a large amount of ammonia nitrogen in the electrolytic manganese residue is leached out and pumped into an ammonia treatment device for absorption. At the same time, the manganese compounds that are easily soluble in water in the electrolytic manganese residue are fully dissolved. Then, the slurry is transported to a magnetic separator for magnetic separation, and the manganese concentrate with a relatively high manganese content is selected and sent back to the original electrolytic manganese production process for manganese recovery. The magnetic separation tailing slurry after magnetic separation is subjected to primary pressure filtration for solid-liquid separation, and the separated filtrate is returned to the original electrolytic manganese production process for manganese recovery. The primary filter residue is sent to an alkali washing tank for digestion and stirring to eliminate soluble sulfates and ammonia gas. The ammonia gas generated during digestion and stirring is also pumped to the ammonia treatment device. The manganese residue slurry after digestion is subjected to secondary pressure filtration for solid-liquid separation, and the separated manganese residue is sent to a dryer for drying treatment. The ammonia gas generated during drying is also pumped to the ammonia treatment device for treatment. The dried manganese residue can be used as building materials, and the filtrate after secondary pressure filtration is returned to the quicklime digester to add quicklime for digestion reaction to produce a saturated lime aqueous solution for recycling, reducing the dosage of quicklime. The entire harmless treatment system for electrolytic manganese residue can effectively recover manganese and ammonia in the electrolytic manganese residue and reuse them in the production system, avoiding waste of resources. At the same time, the alkali solution can be recycled, effectively improving the utilization rate of lime and reducing the treatment cost, making the treated manganese residue meet the discharge requirements of industrial solid waste, achieving the effects of harmlessness and resource utilization of electrolytic manganese residue. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the harmless treatment system for electrolytic manganese residue in an embodiment of the present utility model.

[0017] Figure 2 is a process flow diagram of the harmless treatment system for electrolytic manganese residue in an embodiment of the present utility model.

[0018] Figure 3 is a schematic structural diagram of the ammonia treatment device in an embodiment of the present utility model.

[0019] Reference Numerals: 1 ball mill; 2 magnetic separator; 3 first pressure filter; 4 alkali washing tank; 5 second pressure filter; 6 dryer; 7 ammonia treatment device; 701 induced draft fan; 702 ammonia absorption tower; 703 ammonia water tank; 704 water replenishing tank; 705 air inlet; 706 ammonia water outlet; 707 spraying port; 708 water storage area; 709 ammonia storage area; 7010 air distribution area; 7011 absorption area; 7912 discharge area; 7013 circulation port; 7014 circulation pipe; 7015 circulation pump; 7016 ammonia pipe; 7017 ammonia water pump; 7018 anion exchange resin layer; 7019 uniform grid; 7020 packing layer; 7021 sprayer; 7022 tail gas discharge port; 8 quicklime digester; 9 leaching tank. Detailed Embodiments

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for a fixing function or for a circuit connection function.

[0022] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present utility model.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0024] Please refer to Figures 1 to 3, an electrolytic manganese slag harmless treatment system disclosed in an embodiment includes a ball mill 1, a magnetic separator 2, a first filter press 3, an alkali washing tank 4, a second filter press 5, a dryer 6 and an ammonia treatment device 7. The feed inlet of the magnetic separator 2 is connected to the discharge outlet of the ball mill 1, the fine slag outlet of the magnetic separator 2 is connected to the leaching tank 9 in the original electrolytic manganese production leaching process, the feed inlet of the first filter press 3 is connected to the tail slag outlet of the magnetic separator 2, the filtrate outlet of the first filter press 3 is connected to the leaching tank 9, the feed inlet of the alkali washing tank 4 is communicated with the filter residue outlet of the first filter press 3, the liquid inlet of the alkali washing tank 4 is communicated with the liquid outlet of the quicklime digester 8, the feed inlet of the second filter press 5 is communicated with the discharge outlet of the alkali washing tank 4, the filtrate outlet of the second filter press 5 is communicated with the liquid inlet of the quicklime digester 8, the feed inlet of the dryer 6 is connected to the filter residue outlet of the second filter press 5. Ammonia absorption ports are provided on the ball mill 1, the alkali washing tank 4, the dryer 6 and the quicklime digester 8, and the ammonia absorption ports are communicated with the ammonia treatment device 7. Specifically, the ball mill 1 is an overflow ball mill, and the ammonia absorption ports on the ball mill 1 are respectively arranged at the inlet and outlet of both ends of the ball mill 1. The magnetic separator 2 is a wet magnetic separator 2, and the magnetic field intensity of the magnetic separator 2 reaches between 10000 Gs and 15000 Gs, such as 10000 Gs, 12000 Gs, 15000 Gs. Both the first filter press 3 and the second filter press 5 are diaphragm filter presses. A stirrer (not shown in the figure) is provided on the alkali washing tank 4. The dryer 6 is a drum dryer 6, and the ammonia absorption port on the dryer 6 is arranged at the air flow outlet.In this embodiment, electrolytic manganese residue and water are fed into the interior of ball mill 1 through the feed inlet of ball mill 1 for grinding and cleaning. A large amount of ammonia nitrogen in the electrolytic manganese residue is leached out after ball milling and is extracted from the ammonia gas absorption port and transported to ammonia gas treatment device 7 for treatment. At the same time, compounds soluble in water such as manganese sulfate are dissolved. The electrolytic manganese residue slurry after ball milling is transported to magnetic separator 2 for magnetic separation. The selected magnetic concentrate residue contains a large amount of magnetic manganese compounds, and the magnetic manganese compounds are sent back to the original electrolytic manganese production leaching process for re-leaching and recovery. The magnetic tailing slurry after magnetic separation enters first filter press 3 for primary pressure filtration to separate solid and liquid. The separated filtrate contains a large amount of soluble sulfates, and the soluble sulfates are sent back to the original electrolytic manganese production leaching process for re-leaching to recover the manganese therein. At the same time, the water content in the filter residue is about 20%, and a certain amount of soluble sulfates and ammonia nitrogen still remain. The filter residue is sent to alkali washing tank 4 for digestion and stirring to eliminate most of the soluble sulfates and ammonia gas contained in the manganese residue after water washing, ball milling and magnetic separation. During digestion and stirring, the ammonia gas is pumped to ammonia gas treatment device 7 for absorption treatment. The digested manganese residue slurry is sent to second filter press 5 for secondary pressure filtration to separate solid and liquid. The water content of the manganese residue after secondary pressure filtration is about 15%. The manganese residue after secondary pressure filtration is sent to dryer 6 for drying treatment, so that the residual ammonia nitrogen in the manganese residue reacts with hydroxide ions to form free ammonia, which volatilizes as ammonia gas and is then pumped to ammonia gas treatment device 7 for treatment. The dried manganese residue can be used as building materials. The filtrate separated after secondary pressure filtration is returned to quicklime digester 8 to add quicklime for digestion reaction to produce saturated lime aqueous solution, and the saturated lime aqueous solution is transported back to alkali washing tank 4 for digestion and stirring for recycling, reducing the consumption of quicklime. The ammonia gas generated during the digestion process of the filtrate of secondary pressure filtration in quicklime digester 8 is also pumped to ammonia gas treatment device 7 for treatment. The ammonia water formed after the treatment of ammonia gas treatment device 7 can be used in the original electrolytic manganese production process; by adopting this harmless treatment system for electrolytic manganese residue, the manganese and ammonia gas in the electrolytic manganese residue are effectively recovered and reused in the production system, avoiding waste of resources; at the same time, the alkali solution for digestion and stirring is recycled, effectively improving the utilization rate of lime and reducing the treatment cost; making the treated manganese residue meet the discharge requirements of industrial solid waste and achieving the effect of harmlessness of manganese residue.

[0025] In a preferred embodiment, the ammonia treatment device 7 includes a draft fan 701, an ammonia absorption tower 702, an ammonia water tank 703, and a water replenishing tank 704. The air inlet of the draft fan 701 is connected to the ammonia absorption ports on the ball mill 1, the alkali washing tank 4, the dryer 6, and the quicklime digester 8 to form a negative pressure. The air outlet of the draft fan 701 is connected to the air inlet 705 of the ammonia absorption tower 702 to draw ammonia into the ammonia absorption tower 702 for absorption. The ammonia water tank 703 is connected to the ammonia water outlet 706 of the ammonia absorption tower 702. When the ammonia water reaches a certain concentration, it is pumped into the ammonia water tank 703 for storage and later use. The water replenishing tank 704 is connected to the spraying port 707 of the ammonia absorption tower 702 and is used to wash and absorb the ammonia entering the ammonia absorption tower 702, so as to recover the ammonia nitrogen in the electrolytic manganese slag and prepare high-concentration ammonia water, recycle resources, reduce resource consumption, and reduce environmental pollution.

[0026] In a specific example, the interior of the ammonia absorption tower 702 is respectively provided with a water storage area 708, an ammonia storage area 709, a gas distribution area 7010, an absorption area 7011, and an emission area 7012 from bottom to top. The water storage area 708 and the ammonia storage area 709 are separated by an anion exchange resin layer 7018. A uniform air grid 7019 is provided in the gas distribution area 7010. The air inlet 705 of the ammonia absorption tower 702 is connected to the uniform air grid 7019. A packing layer 7020 is provided in the absorption area 7011, and a sprayer 7021 is arranged above the packing layer 7020. The sprayer 7021 is connected to the spraying port 707. The ammonia absorption tower 702 is provided with a tail gas emission port 7022 communicating with the external atmosphere at the top of the emission area 7012. Ammonia is drawn into the uniform air grid 7019 by the draft fan 701 for uniform distribution and then moves upward from bottom to top, and fully contacts and absorbs with the absorption liquid flowing from top to bottom in the packing layer 7020 to form ammonia water and fall into the ammonia storage area 709 below. When the ammonia water reaches a certain concentration, it is pumped out for recovery and use. The function of the sprayer 7021 is to make the absorption liquid enter the packing layer 7020 more uniformly, further improving the absorption effect; the function of the anion exchange resin layer 7018 is to separate the ammonia storage area 709 and the water storage area 708. The ammonia monohydrate molecules and ammonium ions in the ammonia storage area 709 cannot pass through the anion exchange resin layer 7018 into the water storage area 708, while water molecules can freely pass through and enter the water storage area 708.

[0027] In a specific example, the ammonia absorption tower 702 is provided with a circulation port 7013 on the bottom side wall of the water storage area 708. The circulation port 7013 is communicated with the spraying port 707 through a circulation pipe 7014, and a circulation pump 7015 is provided on the circulation pipe 7014. The water in the water storage area 708 is pumped out by the circulation pump 7015 and returned to the top of the ammonia absorption tower 702 for circulation. For example, when pumping out, the pressure in the ammonia storage area 709 is higher than that in the water storage area 3, and the water molecules in the ammonia storage area 709 accelerate to diffuse into the water storage area 3, so as to reduce the water content in the ammonia storage area 709, concentrate the ammonia water, increase the concentration of the ammonia water, and shorten the production time of the ammonia water.

[0028] In a specific example, the ammonia water port 706 is located on the side wall of the ammonia absorption tower 702 corresponding to the bottom of the ammonia storage area 709. The ammonia water port 706 is communicated with the ammonia water tank 703 through an ammonia water pipe 7016, and an ammonia water pump 7017 is provided on the ammonia water pipe 7016. When the concentration in the ammonia storage area 709 reaches the requirement, it is pumped out by the ammonia water pump 7017 and stored in the ammonia water tank 703 for later use, realizing the recycling of ammonia gas.

[0029] The above content is a further detailed description of the present utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present utility model. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of protection of the patent application.

Claims

1. A harmless treatment system for electrolytic manganese slag, characterized by: Including ball mill; A magnetic separator, wherein the feed port of the magnetic separator is connected to the discharge port of the ball mill, and the slag outlet of the magnetic separator is connected to the leaching tank; a first filter press, wherein a feed port of the first filter press is connected to a tailing port of the magnetic separator, and a filtrate port of the first filter press is connected to the leaching tank; An alkali washing tank, wherein the feed port of the alkali washing tank is connected to the filter residue port of the first filter press, and the liquid inlet of the alkali washing tank is connected to the liquid outlet of the quicklime digester; a second filter press, wherein the feed port of the second filter press is connected to the discharge port of the alkali washing tank, and the filtrate port of the second filter press is connected to the liquid inlet of the quicklime digester; A dryer, wherein the feed port of the dryer is connected to the filter residue port of the second filter press; An ammonia treatment device, wherein the ball mill, the alkali washing tank, the dryer and the quicklime digester are all provided with an ammonia absorption port, and the ammonia absorption port is connected to the ammonia treatment device.

2. The harmless treatment system for electrolytic manganese slag according to claim 1, characterized in that: The ball mill is an overflow ball mill, and the ammonia absorption ports on the ball mill are respectively arranged at the inlet and outlet ports at both ends of the ball mill.

3. The harmless treatment system for electrolytic manganese slag according to claim 1, characterized in that: The magnetic separator is a wet magnetic separator, and the magnetic field strength of the magnetic separator reaches between 10000GS and 15000GS.

4. The harmless treatment system for electrolytic manganese slag according to claim 1, characterized in that: The first filter press and the second filter press are both diaphragm filter presses.

5. The harmless treatment system for electrolytic manganese slag according to claim 1, characterized in that: The alkali washing tank is provided with a stirrer.

6. The harmless treatment system for electrolytic manganese slag according to claim 1, characterized in that: The dryer is a drum dryer, and the ammonia absorption port on the dryer is arranged at the air flow outlet.

7. The harmless treatment system for electrolytic manganese slag according to any one of claims 1 to 6, characterized in that: The ammonia treatment device includes an induced draft fan, an ammonia absorption tower, an ammonia water tank and a water replenishment tank. The air inlet of the induced draft fan is connected to the ammonia absorption ports on the ball mill, the alkali washing tank, the dryer and the quicklime digester. The air outlet of the induced draft fan is connected to the air inlet of the ammonia absorption tower. The ammonia water tank is connected to the ammonia water port of the ammonia absorption tower. The water replenishment tank is connected to the spraying port of the ammonia absorption tower.

8. The harmless treatment system for electrolytic manganese slag according to claim 7, characterized in that: The interior of the ammonia absorption tower is provided with a water storage area, an ammonia storage area, an air distribution area, an absorption area and a discharge area from bottom to top, the water storage area and the ammonia storage area are separated by an anion exchange resin layer, the air distribution area is provided with an air distribution grid, the air inlet of the ammonia absorption tower is connected with the air distribution grid, a packing layer is provided in the absorption area, a sprayer is provided above the packing layer, the sprayer is connected with the spraying port, and the ammonia absorption tower is provided with an exhaust gas discharge port connected to the external atmosphere at the top of the discharge area.

9. The harmless treatment system for electrolytic manganese slag according to claim 8, characterized in that The bottom side wall of the ammonia absorption tower located in the water storage area is provided with a circulation port, the circulation port is connected with the spray port through a circulation pipe, and a circulation pump is provided on the circulation pipe.

10. The harmless treatment system for electrolytic manganese slag according to claim 9, characterized in that: The ammonia water inlet is located on the side wall of the ammonia absorption tower corresponding to the bottom of the ammonia storage area. The ammonia water inlet is connected to the ammonia water tank through an ammonia water pipe, and an ammonia water pump is provided on the ammonia water pipe.

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