Potassium chloride recovery equipment for potassium base salt mud

Abstract

The utility model belongs to potassium base three wastes treatment technical field, concretely is a kind of equipment for recovering potassium chloride in potassium base salt mud, flash tank, steam pipe network, condensing tank, filter press, washing pool;The feed end of flash tank is connected with the top of condensing tank by first pipeline and communicates;The output end of flash tank is connected with the input end of steam pipe network by flash steam pipeline, and the output end of the flash steam pipeline is connected with the heating steam pipeline extending to the inside of washing pool;The lower discharge end of condensing tank is connected with the feed end of filter press by second pipeline;Washing pool is connected with the feed end of filter press by salt mud feed pipeline;Pump body is arranged on second pipeline and salt mud feed pipeline;The bottom of filter press is equipped with filter material receiving hopper for receiving filter material, and the discharge end of filter press is equipped with filtrate salt pipe for conveying filtrate to salt making process, and the application has the beneficial effects of efficient recovery of potassium chloride, improved resource utilization rate and the like.

Description

Technical Field

[0001] This utility model belongs to the field of potassium alkali waste treatment technology, specifically a device for recovering potassium chloride from potassium alkali salt mud. Background Technology

[0002] In the potash production process, the treatment of potash sludge has always been a pressing problem in the industry. As a general industrial solid waste, potash sludge mainly originates from various units of primary brine refining. Its composition is complex, including Mg(OH)2, CaCO3, KCl, BaSO4, and silt. Due to limitations in raw materials and processes, the removal of chloride ions from the sludge is extremely difficult, and its content can often reach over 20%.

[0003] The high levels of chloride ions remaining severely restrict the development of comprehensive utilization technologies for salt mud resources. Currently, the traditional method of salt mud treatment is mainly extensive landfilling. However, this method, due to the presence of large amounts of chloride ions in the salt mud, causes serious soil pollution, damages the ecological environment, and in the long run, will have negative impacts on surrounding agricultural production and vegetation growth.

[0004] Based on the above situation, this application proposes to develop a device for recovering potassium chloride from potassium alkali salt mud, which can improve the recovery rate of potassium chloride, fully realize the potential economic value of salt mud, and provide strong support for the sustainable development of the industry. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device for recovering potassium chloride from potassium alkali salt mud, thereby solving the technical problem that the presence of a large amount of chloride ions in the salt mud will cause serious soil pollution and damage to the ecological environment.

[0006] The present invention adopts the following solution: a device for recovering potassium chloride from potassium alkali mud, characterized in that it includes:

[0007] Flash tanks, steam pipelines, condensers, filter presses, and washing tanks;

[0008] The feed end of the flash tank is connected to the top of the condenser through a first pipeline; the output end of the flash tank is connected to the input end of the steam network through a flash steam pipeline, and the output end of the flash steam pipeline is connected to a heating steam pipeline extending into the washing tank.

[0009] The lower discharge end of the condenser is connected to the feed end of the filter press via a second pipeline;

[0010] The washing tank is connected to the feed end of the filter press via a salt mud feed pipeline;

[0011] Pumps are installed on both the second pipeline and the salt mud feed pipeline;

[0012] The bottom of the filter press is provided with a filter material receiving hopper for receiving filter material, and the discharge end of the filter press is provided with a filtrate desalination pipe for conveying filtrate to the desalination process.

[0013] In a preferred embodiment, the heating steam pipeline is connected to an auxiliary pipe located at the bottom of the washing tank, and several umbrella-shaped distributors are distributed crisscrossingly on the auxiliary pipe.

[0014] In a preferred embodiment, the washing tank is equipped with a stirring device, which includes stirring blades, a motor, and a fixing frame; the stirring blades are disposed in the washing tank and are driven to rotate by the motor, which is mounted on the washing tank via the fixing frame.

[0015] As a preferred embodiment, the umbrella-shaped opening angle of the umbrella-shaped distributor is 45°-60°.

[0016] As a preferred embodiment, the stirring blade is a propeller-type stirring blade with a diameter of 1 / 4 to 1 / 3 of the inner diameter of the washing tank.

[0017] As a preferred embodiment, the flash tank is equipped with a temperature sensor and a pressure sensor.

[0018] As a preferred embodiment, the flash tank is equipped with a flash return water pipeline and a flash supply water pipeline.

[0019] Beneficial effects:

[0020] High-efficiency recovery of potassium chloride and improved resource utilization: Through the coordinated operation of flash tanks, condensers, filter presses, and washing tanks, potassium chloride is effectively recovered from potash-alkali salt mud. The steam treatment process of the flash tank evaporates and separates some of the water and low-boiling-point substances in the salt mud, creating favorable conditions for subsequent potassium chloride extraction. The filter press performs solid-liquid separation of the salt mud, effectively separating the potassium chloride-containing filtrate from other solid impurities. The filtrate is then transported to the salt treatment process, realizing the recovery and reuse of potassium chloride, fully leveraging the potential economic value of the salt mud, and improving resource utilization.

[0021] Reducing the salt content of salt mud and mitigating environmental pollution: This equipment can convert high-salinity salt mud into low-salinity salt mud. During the treatment process, steam is used to heat the salt mud, and an umbrella-shaped distributor on the auxiliary pipeline ensures that the steam acts evenly on the salt mud, increasing the solubility of soluble salt components. After filtration by a filter press, the salt content of the filter cake is significantly reduced, effectively decreasing the chloride content in the salt mud and lowering the risk of pollution to soil and other environmental elements. This achieves low-salinity treatment of salt mud, which is beneficial to ecological environment protection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the present invention.

[0023] Figure label:

[0024] 1. Flash tank; 2. Steam pipeline network; 3. Condenser; 4. Filter press; 5. Washing tank; 6. First pipeline; 7. Flash steam pipeline; 8. Heating steam pipeline; 9. Second pipeline; 10. Salt mud feed pipeline; 11. Pump body; 12. Filter hopper; 13. Filtration salt dissolving pipeline; 14. Auxiliary pipeline; 15. Distributor; 16. Agitator blades; 17. Motor; 18. Fixing frame; 19. Flash return water pipeline; 20. Flash supply water pipeline. Detailed Implementation

[0025] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figure 1 The detailed description of the embodiments will clearly demonstrate this. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0026] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] This equipment mainly consists of core components such as flash tank 1, steam pipeline network 2, condenser 3, filter press 4, and washing tank 5. Each component is interconnected through specific pipelines to realize the recovery of potassium chloride from potassium alkali sludge.

[0028] The feed end of the flash tank 1 is connected to the top of the condenser 3 via the first pipeline 6, providing a material input path for subsequent flash evaporation operations. The output end of the flash tank 1 is connected to the input end of the steam network 2 via the flash steam pipeline 7, allowing the steam generated during flash evaporation to be transported into the steam network 2. Simultaneously, the output end of the flash steam pipeline 7 is connected to a heating steam pipeline 8, extending into the washing tank 5, for heating the materials in the washing tank 5.

[0029] The lower discharge end of the condenser 3 is connected to the feed end of the filter press 4 via the second pipeline 9, conveying the condensed material to the filter press 4. The washing tank 5 is connected to the feed end of the filter press 4 via the salt mud feed pipeline 10, allowing the washed salt mud to enter the filter press 4 for solid-liquid separation. Pumps 11 are installed on both the second pipeline 9 and the salt mud feed pipeline 10 to ensure smooth material transport in the pipelines.

[0030] Flash tank 1 operation process: Flash tank 1 is equipped with temperature and pressure sensors to monitor the temperature and pressure inside the tank in real time. When the material enters flash tank 1 from condenser 3 through the first pipeline 6, flash evaporation occurs under specific temperature and pressure conditions. The steam generated by flash evaporation is transported to steam network 2 through flash steam pipeline 7, while the remaining liquid may be further processed through flash return water pipeline 19 or flash supply water pipeline 20, depending on process requirements. For example, when it is necessary to circulate the liquid in flash tank 1, a portion of the liquid can be returned to the vicinity of the feed end of flash tank 1 through flash return water pipeline 19, mixed with the newly entered material, and flash evaporation can be performed again; when it is necessary to add fresh water or adjust the liquid level in the tank, an appropriate amount of water can be injected into flash tank 1 through flash supply water pipeline 20.

[0031] Working process of condenser 3: Condenser 3 receives a mixture of steam and liquid from other process stages. Inside condenser 3, the steam condenses upon encountering the cold air, turning into liquid. The condensed liquid accumulates at the bottom of condenser 3 under gravity and is then transported to filter press 4 for further processing via the second pipeline 9 and pump 11.

[0032] Working process of filter press 4: Filter press 4 receives material from condenser 3 and washed salt mud from washing tank 5. Inside filter press 4, solid-liquid separation is achieved by applying pressure. The separated filter material falls from the bottom of filter press 4 into filter hopper 12 for subsequent collection and processing. The filtrate is then transported from the outlet of filter press 4 through filtrate salting pipe 13 to the salting process for further production.

[0033] Working process of washing tank 5: Washing tank 5 is equipped with a stirring device, including stirring blades 16, a motor 17, and a fixed frame 18. The stirring blades 16 are propeller-type stirring blades, with a diameter of 1 / 4 to 1 / 3 of the inner diameter of washing tank 5. This design enables efficient stirring of the materials in washing tank 5 under the drive of the motor 17, ensuring thorough mixing of the salt mud and washing liquid, thus improving the washing effect. Simultaneously, a heating steam pipeline 8 is connected to an auxiliary pipeline 14 located at the bottom of washing tank 5. Several umbrella-shaped distributors 15 are staggered along the auxiliary pipeline 14, with an umbrella-shaped opening angle of 45°-60°. Steam entering from the heating steam pipeline 8 is evenly distributed at the bottom of washing tank 5 through the auxiliary pipeline 14 and the distributors 15, heating the materials in washing tank 5, which helps improve washing efficiency and dissolve substances such as potassium chloride in the salt mud. With the combined action of the stirring equipment and the heating steam, the washing tank 5 thoroughly washes the salt mud, and the washed salt mud is then transported to the filter press 4 through the salt mud feed pipeline 10 under the action of the pump body 11.

[0034] In practical use: Salt dissolution and precipitation formation: The raw salt is placed in a salt dissolution tank and dissolved using brine at a temperature of approximately 55-65℃. During the dissolution process, potassium hydroxide, potassium carbonate, and potassium hypochlorite are added to the brine sequentially. These chemical substances react with calcium and magnesium ions in the brine, causing them to precipitate as Mg(OH)2, CaCO3, etc. After a period of reaction, the brine containing these precipitates is periodically discharged into washing tank 5.

[0035] Washing tank treatment: 0.2MPa low-pressure steam enters the auxiliary pipe 14 at the bottom of the washing tank 5 through the main inlet pipe. Umbrella-shaped distributors 15, arranged in a staggered pattern on the auxiliary pipe 14, evenly release the steam into the washing tank 5. The umbrella-shaped distributors 15 have an opening angle of 45°-60°, a design that allows the steam to fully contact the sludge-like precipitates such as Mg(OH)2 and CaCO3 in the washing tank 5 in a counter-current manner. Under the impact of the steam flow, the salt sludge in the tank flows upwards, forming a turbulent flow, preventing sediment accumulation and enhancing the thermal convection system. Simultaneously, the stirring equipment installed in the washing tank 5 begins to operate. The motor 17 in the stirring equipment is mounted on the washing tank 5 via a fixing frame 18, and the motor 17 drives the propeller-type stirring blades 16 to rotate. The diameter of the propeller-type stirring blade 16 is 1 / 4 to 1 / 3 of the inner diameter of the washing tank 5. Its rotation can further stir the salt mud, promote the full mixing of steam and salt mud, improve the solubility of soluble salt components, and make the salt mud form a uniform suspension under the dual action of steam and stirring.

[0036] Filtration Operation: After steam heating, the temperature of the salt mud suspension in the washing tank 5 reaches approximately 50-55℃. At this point, the salt mud suspension is pressurized to 0.8MPa by pump 11 on the salt mud feed pipeline 10 and then fed into the plate and frame filter press 4. Simultaneously, the liquid from the lower outlet of the condenser 3 also enters the filter press 4 through pump 11 on the second pipeline 9. Under the action of the pressing device of the filter press 4, multiple filter plates are clamped between the pressing plate and the thrust plate, forming a closed filter chamber between every two filter plates. Under the feed pressure, the salt mud suspension separates from the filtrate holes through the filter cloth, and the solid phase salt mud remains in the filter chamber to form a filter cake with a moisture content of approximately 40% and a salt and chloride content of approximately 20%. To ensure stable operation of the filter press 4, the plate and frame filter press 4 is configured with one operating unit and one standby unit. When the operating pressure exceeds 1.0MPa, it automatically switches to the standby unit.

[0037] Filter cake washing and filtrate treatment: Steam condensate enters from the middle of filter press 4, reheating the low-temperature, low-pressure formed filter cake to 60°C, filling the space between the filter plates and filter cloth with water for a secondary wash. This operation aims to remove deposits and salts from the surface of the filter cake until the washing liquid is completely clear and free of impurities. The filtrate from the primary filtration and secondary washing is sent to the desalination pipe 13 for reuse, achieving resource recycling.

[0038] Filter cake post-processing and flash tank operation: After secondary washing, the filter cake with a salt content of less than 5% is fed into the discharge hopper 12 at the bottom of the filter press 4 and transported off-site. The flash water in flash tank 1 comes from the evaporation section of the hydrogen chloride synthesis furnace; the flash water at approximately 130°C enters flash tank 1. Temperature and pressure sensors installed on flash tank 1 monitor the internal temperature and pressure in real time. When the steam pressure reaches the set value, the automatic delivery valve connected to the pipeline network automatically opens, and the flash steam enters the steam network 2 through flash steam pipeline 7. The flash return water is used as boiler makeup water circulation. The bottom drain valve of flash tank 1 is normally open. When the liquid level is higher than 70% and the temperature is higher than 95°C, the drain valve is opened wide to discharge excess condensate, ensuring the stable operation of flash tank 1.

[0039] The above description is only for illustrating the present utility model. It should be understood that the present utility model is not limited to the above embodiments, and various modifications that conform to the concept of the present utility model are within the protection scope of the present utility model.

Claims

1. A device for recovering potassium chloride from potassium alkali mud, characterized in that, include: Flash tanks, steam pipelines, condensers, filter presses, and washing tanks; The feed end of the flash tank is connected to the top of the condenser through a first pipeline; the output end of the flash tank is connected to the input end of the steam network through a flash steam pipeline, and the output end of the flash steam pipeline is connected to a heating steam pipeline extending into the washing tank. The lower discharge end of the condenser is connected to the feed end of the filter press via a second pipeline; The washing tank is connected to the feed end of the filter press via a salt mud feed pipeline; Pumps are installed on both the second pipeline and the salt mud feed pipeline; The bottom of the filter press is provided with a filter material receiving hopper for receiving filter material, and the discharge end of the filter press is provided with a filtrate desalination pipe for conveying filtrate to the desalination process.

2. The equipment for recovering potassium chloride from potassium alkali mud according to claim 1, characterized in that, The heated steam pipeline is connected to an auxiliary pipe located at the bottom of the washing tank, and several umbrella-shaped distributors are distributed crisscrossingly on the auxiliary pipe.

3. The equipment for recovering potassium chloride from potassium alkali mud according to claim 1, characterized in that, The washing tank is equipped with a stirring device, which includes stirring blades, a motor and a fixed frame. The stirring blades are disposed in the washing tank and are driven to rotate by the motor. The motor is mounted on the washing tank through the fixed frame.

4. The equipment for recovering potassium chloride from potassium alkali mud according to claim 2, characterized in that, The umbrella-shaped opening angle of the umbrella-shaped distributor is 45°-60°.

5. The equipment for recovering potassium chloride from potassium alkali mud according to claim 3, characterized in that, The stirring blade is a propeller-type stirring blade with a diameter of 1 / 4 to 1 / 3 of the inner diameter of the washing tank.

6. A device for recovering potassium chloride from potassium alkali mud according to any one of claims 1-5, characterized in that, The flash tank is equipped with temperature and pressure sensors.

7. A device for recovering potassium chloride from potassium alkali mud according to any one of claims 1-5, characterized in that, The flash tank is equipped with a flash return water pipeline and a flash supply water pipeline.

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