Phosphorus sludge low-temperature distillation recovery system based on cyclic utilization
The low-temperature distillation and recovery system for recycled mud phosphorus, utilizing a solid-liquid separator and a recycling framework, solves the problems of low mud phosphorus recovery efficiency and high residual phosphorus levels, achieving efficient and environmentally friendly phosphorus recovery.
Patent Information
- Application Number
- CN202520423330.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-12
AI Technical Summary
Existing technologies have low efficiency in recovering mud phosphorus, high residual phosphorus levels, high energy consumption, and are not environmentally friendly, making it difficult to effectively recover yellow phosphorus.
A low-temperature distillation recovery system for mud phosphorus based on recycling is adopted, including a spray tower, a dissolving and mixing vessel, a washing vessel, a distillation vessel and a condenser. Through a solid-liquid separator and a recycling frame, water and solvent in mud phosphorus are separated and recovered, thereby improving the dissolution rate and recovery rate of phosphorus.
This method improves the phosphorus recovery rate from mud phosphorus, reduces solvent loss and yellow phosphorus residue, lowers energy consumption, and achieves efficient and environmentally friendly phosphorus recovery.
Smart Images
Figure CN223831815U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mud-phosphorus recovery technology, specifically a low-temperature distillation recovery system for mud-phosphorus based on recycling. Background Technology
[0002] The manufacturing process of yellow phosphorus generates a large amount of high-temperature flue gas, which contains dust impurities and harmful gases. Spray towers are typically used for cooling to recover residual yellow phosphorus from the flue gas. Simultaneously, the dust impurities in the flue gas are washed and precipitated by the water sprayed from the tower. This washed-off dust impurities form a large amount of phosphorus mud, a significant byproduct of yellow phosphorus production. Phosphorus mud contains phosphorus, typically between 20% and 70%. Therefore, phosphorus is removed from... Effective recovery of phosphorus from phosphorus mud will directly yield a large amount of phosphorus, reducing phosphorus waste and environmental pollution caused by phosphorus discharge. The common method for recovering phosphorus from phosphorus mud is dry distillation, in which the phosphorus mud is placed in a sealed container and subjected to a high temperature of over 300 degrees Celsius to vaporize and condense the yellow phosphorus in the mud mud, thus recovering the yellow phosphorus from the phosphorus mud. However, this method has high energy consumption, low recovery rate, difficulty in tail gas recovery, and high phosphorus content in the residue. It is inefficient and leaves high phosphorus residue, making it extremely inconvenient and environmentally unfriendly. Utility Model Content
[0003] The purpose of this invention is to provide a low-temperature distillation and recovery system for mud phosphorus based on recycling, in order to solve the problems of low extraction and recovery efficiency and high residual phosphorus in the above-mentioned background technology.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature distillation recovery system for mud-phosphorus based on recycling, comprising a spray tower, a dissolving and mixing vessel, a washing vessel, a distillation vessel, and a condenser. The outlet of the sedimentation tank of the spray tower is connected to the dissolving and mixing vessel via a pipeline, and the outlet of the dissolving and mixing vessel is connected to the inlet of the washing vessel via a pipeline. The liquid outlet of the washing vessel is connected to the inlet of the distillation vessel via a pipeline, and the gas outlet of the distillation vessel is connected to the inlet of the condenser. A first solid-liquid separator is fixedly connected to the pipeline of the sedimentation tank of the spray tower, and a slurry-water separation frame is provided between the first solid-liquid separator and the spray tower. The slurry-water separation frame separates the water in the mud-phosphorus and transports it into the dissolving and mixing vessel to increase the dissolution rate of the solvent and phosphorus in the mud-phosphorus and reduce the mutual interference of water on the solvent.
[0005] Preferably, the slurry-water separation frame includes: a plunger pump, the input end of which is connected to the solid output end of the first solid-liquid separator, and the liquid output end of the first solid-liquid separator is connected to the spray pipe of the spray tower, and the output end of the plunger pump is connected to the feed port of the dissolving and mixing vessel.
[0006] By adopting the above technical solution, the mud and phosphorus in the spray tower can be separated from the water used for washing and cooling in the spray tower through the first solid-liquid separator, and the separated water can be sent back to the spray tower for recycling. At the same time, the water in the mud and phosphorus can be separated by the first solid-liquid separator, so that after the mud and phosphorus are sent into the dissolving and mixing vessel by the plunger pump, the interference of water on the interaction between the solvent and phosphorus can be reduced, the mass transfer effect can be improved and the performance of the solvent can be maintained, the separation efficiency and effect of phosphorus and phosphorus mud can be accelerated, and the separation purity and efficiency can be improved.
[0007] Preferably, the output pipe of the dissolving and mixing vessel is fixedly connected to a slurry pump, and the other end of the slurry pump is connected to a washing vessel. The slurry discharge pipe of the washing vessel is fixedly connected to a waste slurry pump, and one end of the waste slurry pump is fixedly connected to a second solid-liquid separator. The liquid output end of the second solid-liquid separator is connected to the washing vessel, and the solid output end of the second solid-liquid separator is connected to a waste residue tank.
[0008] By adopting the above technical solution, the residual solvent in the slurry can be separated, so that the residual solvent in the slurry can be recovered. Reducing the residual solvent in the slurry can recover more yellow phosphorus. At the same time, the filtered waste residue can be sent into the waste residue pool and can be used in other places.
[0009] Preferably, the liquid output pipe of the distillation vessel is fixedly connected to a finished product pump, and the output end of the finished product pump is fixedly connected to a liquid phosphorus storage tank. A cooling and recycling frame is provided on one side of the condenser. The cooling and recycling frame cools the heated water after condensation and can be added to the dissolving and mixing vessel, washing vessel, distillation vessel and condenser for use.
[0010] Using the above technical solution, the solvent can be heated and distilled through a distillation kettle, allowing the solvent to be evaporated into gas and separated from liquid phosphorus. The liquid phosphorus can be easily pumped into a liquid phosphorus storage tank through a finished product pump, facilitating the discharge and collection of liquid phosphorus, and enabling the solvent to be recycled and reused.
[0011] Preferably, the cooling and recycling framework includes: a water tank, the input end of which is connected to an external water source, and the inlet and outlet pipes of the water tank are connected to the internal pipes of the condenser. A cooling tower is provided on one side of the water tank, and the input and output ends of the cooling tower are connected to the water tank.
[0012] By adopting the above technical solution, water can be stored in a water tank and recycled. The water inside the tank can be pumped to the condenser. The solvent vapor is condensed by the circulation of water inside the condenser, and the mud phosphorus is separated by the first solid-liquid separator, so that the subsequent solvent condensation can be more pure and the purity of liquid phosphorus can be guaranteed.
[0013] Preferably, the outer surface of the water tank is provided with a water sealing pipe, and the water sealing pipe is connected to the dissolving and mixing vessel, the washing vessel, and the distillation vessel respectively.
[0014] By adopting the above technical solution, water can be delivered into the dissolving and mixing vessel, washing vessel, and distillation vessel through the sealed water delivery pipe set on the outer surface of the water tank. This facilitates the replenishment of the sealed water in the dissolving and mixing vessel, washing vessel, and distillation vessel, ensuring that the sealed water in the dissolving and mixing vessel, washing vessel, and distillation vessel is always sufficient. This allows the dissolving and mixing vessel, washing vessel, and distillation vessel to be isolated from external air during operation, thereby improving the safety of the dissolving and mixing vessel, washing vessel, and distillation vessel during use.
[0015] Preferably, the condensate outlet of the condenser is fixedly connected to a solvent storage tank, and the output end of the solvent storage tank is fixedly connected to a constant temperature heater, one end of which is connected to the solvent input end of the dissolving and mixing vessel.
[0016] Using the above technical solution, the condensed solvent can be stored in a solvent storage tank, and the solvent in the solvent storage tank can be added back to the dissolving and mixing vessel for reaction and mixing. When the solvent passes through the constant temperature heater, it can be heated so that the solvent is injected into the dissolving and mixing vessel after being heated to a certain temperature, thereby improving the dissolution and mixing speed and effect of the solvent and the phosphorus in the mud phosphorus.
[0017] Compared with the prior art, the beneficial effects of this utility model are: the low-temperature distillation recovery system for mud and phosphorus based on recycling:
[0018] 1. The water content of the mud phosphorus in the sedimentation tank of the spray tower is squeezed out by the first solid-liquid separator, and the separated water can be sent back to the spray tower for use, thereby reducing the water content of the mud phosphorus. The mud phosphorus is then sent into the dissolving and mixing vessel by a plunger pump and solvent is injected for mixing and dissolution. By removing and reducing the water content in the mud phosphorus, the mass transfer effect between the solvent and phosphorus is improved, the performance of the solvent is maintained, the interference of water on the interaction between the solvent and phosphorus is reduced, the fusion speed and effect of yellow phosphorus and solvent are improved, and the residue of yellow phosphorus inside the mud phosphorus is reduced.
[0019] 2. After yellow phosphorus is extracted from the mud phosphorus and dissolved in the solvent, it can be pumped into the washing tank for sedimentation and separation. The waste slurry at the bottom is pumped into the second solid-liquid separator to separate the residual solvent in the waste slurry and send it back to the washing tank. This reduces solvent loss and phosphorus residue in the waste slurry, improves the recovery rate of yellow phosphorus, and reduces the residue of yellow phosphorus in the waste slurry.
[0020] 3. When the phosphorus-containing solvent is fed into the distillation kettle and distilled, the solvent will evaporate and separate from the phosphorus. The gaseous solvent will enter the condenser through the pipeline and re-condense into solvent through heat exchange in the condenser. The amount of water in the mud phosphorus treated by the first solid-liquid separator is extremely low. At this time, the remaining liquid phosphorus contains very low levels of impurities. The solvent also has a high quality after distillation, condensation and reduction, allowing the solvent to be recycled with high performance and participate in the recycling process. This also reduces the difficulty of subsequent treatment of liquid phosphorus.
[0021] 4. After the gaseous solvent passes through the condenser for heat exchange, it will condense into liquid and be collected in the solvent storage tank. When the solvent needs to be released into the dissolving and mixing vessel for use, the solvent will be heated by a constant-temperature heater so that the solvent passing through can be heated to a temperature higher than that of yellow phosphorus. This allows the heated solvent to fuse and separate with the yellow phosphorus in the mud phosphorus more quickly, improving the extraction efficiency and effect of yellow phosphorus and reducing the yellow phosphorus residue in the mud phosphorus. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the framework of the embodiments of this utility model.
[0023] Figure 2 This is a schematic diagram of the slurry-water separation frame of this utility model.
[0024] Figure 3 This is a schematic diagram of the mud-phosphorus decomposition treatment framework of this utility model.
[0025] Figure 4 This is a schematic diagram of the cooling and temperature reduction frame of this utility model.
[0026] Figure 5 This is a schematic diagram of the solvent recovery framework of this utility model.
[0027] Figure 6 This is a schematic diagram of the solution recycling framework of this utility model.
[0028] In the diagram: 1. Spray tower; 2. First solid-liquid separator; 3. Plunger pump; 4. Dissolving and mixing vessel; 5. Slurry pump; 6. Washing vessel; 7. Waste slurry pump; 8. Second solid-liquid separator; 9. Waste residue pool; 10. Distillation vessel; 11. Finished product pump; 12. Liquid phosphorus storage tank; 13. Condenser; 14. Solvent storage tank; 15. Constant temperature heater; 16. Water tank; 17. Cooling tower; 18. Sealing water delivery pipe. Detailed Implementation
[0029] 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.
[0030] Please see Figure 1-6 This utility model provides a technical solution: a low-temperature distillation recovery system for mud and phosphorus based on recycling, including a spray tower 1, a dissolving and mixing vessel 4, a washing vessel 6, a distillation vessel 10, and a condenser 13. The outlet of the sedimentation tank of the spray tower 1 is connected to the dissolving and mixing vessel 4 via a pipeline, and the outlet of the dissolving and mixing vessel 4 is connected to the inlet of the washing vessel 6 via a pipeline. The liquid outlet of the washing vessel 6 is connected to the inlet of the distillation vessel 10 via a pipeline, and the gas outlet of the distillation vessel 10 is connected to the inlet of the condenser 13. The sedimentation tank pipeline of the spray tower 1... A first solid-liquid separator 2 is fixedly connected to the top, and a slurry separation frame is set between the first solid-liquid separator 2 and the spray tower 1. The slurry separation frame separates the water in the mud phosphorus and transports it into the dissolving and mixing vessel 4 to increase the dissolution rate of the solvent and the phosphorus in the mud phosphorus and reduce the mutual interference of water on the solvent. The slurry separation frame includes: a plunger pump 3, the input end of the plunger pump 3 is connected to the solid output end of the first solid-liquid separator 2, and the liquid output end of the first solid-liquid separator 2 is connected to the spray pipe of the spray tower 1. The output end of the plunger pump 3 is connected to the feed port of the dissolving and mixing vessel 4.
[0031] The first solid-liquid separator 2 can separate the water from the mud and phosphorus in the sedimentation tank of the spray tower 1, so that the separated water can be sent back to the spray tower 1 and sprayed out again for cooling and dust suppression. The dehydrated mud and phosphorus will be sent into the dissolving and mixing vessel 4 through the plunger pump 3. By removing the water from the mud and phosphorus, the fusion rate of the solvent and phosphorus in the mud and phosphorus is increased, the complexity of subsequent solvent treatment is reduced, and the interference of water on the interaction between the solvent and phosphorus is reduced, thus improving the mass transfer effect and maintaining the performance of the solvent. At the same time, it allows phosphorus to react and mix better with the solvent, thereby improving the separation efficiency and speed.
[0032] The output pipe of the dissolving and mixing vessel 4 is fixedly connected to a slurry pump 5, and the other end of the slurry pump 5 is connected to a washing vessel 6. The slurry discharge pipe of the washing vessel 6 is fixedly connected to a waste slurry pump 7, and one end of the waste slurry pump 7 is fixedly connected to a second solid-liquid separator 8. The liquid output end of the second solid-liquid separator 8 is connected to the washing vessel 6, and the solid output end of the second solid-liquid separator 8 is connected to a waste residue tank 9.
[0033] After the dissolving and mixing vessel 4 mixes the mud and phosphorus with the solvent and extracts the phosphorus, the slurry pump 5 can be started. The slurry pump 5 pumps the mud mixture into the washing vessel 6, where the mud and phosphorus and the solvent liquid are settled and separated. After the sedimentation and separation are completed, the waste slurry can be pumped out by the waste slurry pump 7 and sent to the second solid-liquid separator 8. The second solid-liquid separator 8 separates the remaining solvent in the waste slurry and sends it back to the washing vessel 6. The dewatered waste slurry is then sent to the waste residue tank 9, reducing solvent loss, increasing phosphorus recovery rate, and reducing the solvent content in the waste slurry.
[0034] The liquid output pipe of the distillation vessel 10 is fixedly connected to the finished product pump 11, and the output end of the finished product pump 11 is fixedly connected to the liquid phosphorus storage tank 12. A cooling and recycling frame is provided on one side of the condenser 13. The water heated after condensation is cooled by the cooling and recycling frame and can be added to the dissolving and mixing vessel 4, washing vessel 6, distillation vessel 10 and condenser 13 for use.
[0035] The phosphorus-containing solvent separated in the washing vessel 6 is fed into the distillation vessel 10 by purging gas into the washing vessel 6. When the distillation vessel 10 is started, the solvent will evaporate, separating the solvent from the liquid phosphorus. After evaporation and vaporization, the solvent will enter the condenser 13 through the pipe. The condenser 13 will condense the solvent into liquid and store it in the solvent storage tank 14. The remaining liquid phosphorus will be pumped into the liquid phosphorus storage tank 12 by the finished product pump 11, completing the extraction and recovery of phosphorus, and at the same time, the recovery of solvent. The solvent can be added back into the dissolving and mixing vessel 4 for recycling.
[0036] The cooling and recycling framework includes: a water tank 16, the input end of which is connected to an external water source, and the inlet and outlet pipes of the water tank 16 are connected to the internal pipes of the condenser 13. A cooling tower 17 is provided on one side of the water tank 16, and the input and output ends of the cooling tower 17 are connected to the water tank 16.
[0037] Cooling water can be stored in the water tank 16 and circulated in the condenser 13 to remove the heat generated after heat exchange. At the same time, the cooling water is cooled and dissipated through the cooling tower 17, so that the condenser 13 can operate stably for heat exchange and reduce water waste.
[0038] The outer surface of the water tank 16 is provided with a sealing water delivery pipe 18, which is connected to the dissolving and mixing vessel 4, the washing vessel 6, and the distillation vessel 10 respectively.
[0039] Water inside the water tank 16 can be added to the dissolving and mixing vessel 4, the washing vessel 6 and the distillation vessel 10 through the sealed water delivery pipe 18 to maintain the airtightness of the dissolving and mixing vessel 4, the washing vessel 6 and the distillation vessel 10 so that air cannot enter and the adverse effects caused by air entering are eliminated.
[0040] The condensate outlet of the condenser 13 is fixedly connected to a solvent storage tank 14, and the output end of the solvent storage tank 14 is fixedly connected to a constant temperature heater 15. One end of the constant temperature heater 15 is connected to the solvent input end of the dissolving and mixing vessel 4.
[0041] After the solvent storage tank 14 discharges the solvent, the solvent will be heated by the constant temperature heater 15 to a temperature higher than the melting point of yellow phosphorus before being discharged into the dissolution mixing tank 4. This allows the yellow phosphorus in the mud phosphorus to dissolve in the solvent more quickly, improving the dissolution effect and efficiency, increasing the dissolution speed while reducing the residue of yellow phosphorus.
[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A low-temperature distillation recovery system for mud-phosphorus based on recycling, comprising a spray tower (1), a dissolving and mixing vessel (4), a washing vessel (6), a distillation vessel (10), and a condenser (13), wherein the outlet of the sedimentation tank of the spray tower (1) is connected to the dissolving and mixing vessel (4) by a pipeline, and the outlet of the dissolving and mixing vessel (4) is connected to the inlet of the washing vessel (6) by a pipeline, the liquid outlet of the washing vessel (6) is connected to the inlet of the distillation vessel (10) by a pipeline, and the gas outlet of the distillation vessel (10) is connected to the gas inlet of the condenser (13), characterized in that: The first solid-liquid separator (2) is fixedly connected to the sedimentation tank pipe of the spray tower (1), and a slurry separation frame is provided between the first solid-liquid separator (2) and the spray tower (1). The water in the mud phosphorus is separated by the slurry separation frame and transported into the dissolving mixing tank (4) to increase the dissolution rate of the solvent and phosphorus in the mud phosphorus and reduce the mutual interference of water on the solvent.
2. The low-temperature distillation recovery system for mud-phosphorus based on recycling according to claim 1, characterized in that: The slurry separation frame includes: a plunger pump (3), the input end of which is connected to the solid output end of the first solid-liquid separator (2), and the liquid output end of the first solid-liquid separator (2) is connected to the spray pipe of the spray tower (1), and the output end of the plunger pump (3) is connected to the feed port of the dissolving mixing vessel (4).
3. The low-temperature distillation recovery system for mud-phosphorus based on recycling according to claim 1, characterized in that: The output pipe of the dissolving and mixing vessel (4) is fixedly connected to a slurry pump (5), and the other end of the slurry pump (5) is connected to a washing vessel (6). The slurry discharge pipe of the washing vessel (6) is fixedly connected to a waste slurry pump (7), and one end of the waste slurry pump (7) is fixedly connected to a second solid-liquid separator (8). The liquid output end of the second solid-liquid separator (8) is connected to the washing vessel (6), and the solid output end of the second solid-liquid separator (8) is connected to a waste residue tank (9).
4. The low-temperature distillation recovery system for mud-phosphorus based on recycling according to claim 1, characterized in that: The liquid output pipe of the distillation vessel (10) is fixedly connected to the finished product pump (11), and the output end of the finished product pump (11) is fixedly connected to the liquid phosphorus storage tank (12). A cooling and recycling frame is provided on one side of the condenser (13). The water heated after condensation is cooled by the cooling and recycling frame and can be added to the dissolving and mixing vessel (4), washing vessel (6), distillation vessel (10) and condenser (13) for use.
5. The low-temperature distillation recovery system for mud-phosphorus based on recycling according to claim 4, characterized in that: The cooling and recycling framework includes: a water tank (16), the input end of which is connected to an external water source, and the inlet and outlet pipes of the water tank (16) are connected to the pipes inside the condenser (13). A cooling tower (17) is provided on one side of the water tank (16), and the input and output ends of the cooling tower (17) are connected to the water tank (16).
6. The low-temperature distillation recovery system for mud-phosphorus based on recycling according to claim 5, characterized in that: The outer surface of the water tank (16) is provided with a sealing water delivery pipe (18), and the sealing water delivery pipe (18) is connected to the dissolving and mixing vessel (4), the washing vessel (6), and the distillation vessel (10) respectively.
7. The low-temperature distillation recovery system for mud-phosphorus based on recycling according to claim 1, characterized in that: The condenser (13) has a condensate outlet that is fixedly connected to a solvent storage tank (14), and the output end of the solvent storage tank (14) is fixedly connected to a constant temperature heater (15). One end of the constant temperature heater (15) is connected to the solvent input end of the dissolving mixing vessel (4).