Phosphoric acid dissolution recycling device based on treatment of Fenton process sludge
By designing a phosphoric acid dissolution and reuse device, the iron oxide in the Fenton process sludge is reacted with phosphoric acid to produce iron phosphate, which solves the problem of iron resource waste in the sludge after Fenton reaction wastewater treatment and realizes the reuse of iron resources.
Patent Information
- Application Number
- CN202423000087.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-05
AI Technical Summary
In the prior art, the sludge generated after the treatment of Fenton reaction wastewater contains a large amount of iron hydroxide and is often treated as solid waste, resulting in a waste of iron resources.
A phosphoric acid dissolution and reuse device based on the treatment of Fenton process sludge is designed. Through the combination of a reaction box and a recovery box, iron oxide and phosphoric acid are further reacted in the reaction storage chamber to generate iron phosphate, thereby realizing resource reuse.
Effectively recycle and utilize metal elements in Fenton reaction sludge, reduce resource waste, and improve the utilization rate of iron resources.
Smart Images
Figure CN223454261U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of phosphoric acid acid dissolution recovery, especially to a kind of phosphoric acid acid dissolution recycling device based on processing fenton process sludge. BACKGROUND
[0002] Lithium iron phosphate is a lithium ion battery positive material with high energy density, long cycle life, good safety performance and other advantages. In recent years, with the development of new energy vehicles and energy storage industries, the market demand for lithium iron phosphate batteries has gradually increased. As an important raw material for the preparation of lithium iron phosphate, the demand for iron phosphate will also continue to increase. Therefore, recycling iron resources for the preparation of iron phosphate is a feasible resource utilization method.
[0003] Currently, Fenton reaction is a relatively common method for treating wastewater containing refractory organic matter. Due to the addition of ferrous ions, the sludge generated after wastewater treatment contains about 55% to 75% of iron hydroxide, and the generated sludge is basically treated in the form of solid waste, resulting in a large waste of iron resources, and the iron resources contained in Fenton sludge can be further reacted to generate iron phosphate. INVENTION CONTENTS
[0004] The utility model discloses a kind of phosphoric acid acid dissolution recycling devices based on processing fenton process sludge, to solve the problems that there are in prior art: Fenton reaction wastewater treatment produces sludge containing more iron hydroxide, but these iron hydroxide is often treated in the form of solid waste, thereby generating a large waste of iron resources.
[0005] To achieve the above object, the utility model discloses a kind of phosphoric acid acid dissolution recycling devices based on processing fenton process sludge, including reaction box and recovery tank, the reaction box is divided into reaction storage chamber and waste phosphoric acid storage chamber, the first material input joint and the second material input joint are fixedly connected with the reaction box top end, the reaction storage chamber and phosphoric acid storage chamber are provided with electric control valve at communicated output, the filter plate frame is slidably inserted in the reaction box located waste phosphoric acid storage chamber upper end, reaction box output joint is set in the reaction box lower end, recovery pump and recovery input pipe are fixedly connected with the recovery tank top end, the recovery pump output end is fixedly connected with recovery input pipe through connecting pipe, the recovery tank is provided with multiple groups of heat pipe, the heat pipe input end is connected with external steam heat exchanger, the recovery tank and reaction box top end are fixedly connected with pressure relief port, by further reaction to generate iron phosphate by inputting iron oxide and phosphoric acid into reaction storage chamber, can effectively utilize the sludge prepared from Fenton reaction early stage and prepare iron phosphate, with the function of recycling and utilizing metal elements in Fenton reaction sludge, can realize the reuse of resources, reduce the waste of resources.
[0006] As a preferred implementation, the reaction storage chamber is fixedly connected with a pH probe on the inner wall, and the pH probe is used to detect the pH value of the solution in the reaction storage chamber, so as to facilitate the judgment of the reaction.
[0007] As a preferred implementation, the reaction box is fixedly connected with a stirring shaft at the middle of the top end, the reaction storage chamber is rotatably connected with a driving motor, the stirring shaft is fixedly connected with the output shaft of the driving motor, and a plurality of stirring blades are fixedly connected with the outer periphery of the stirring shaft, so that the mixed solution in the reaction storage chamber is stirred by the stirring shaft and the stirring blades to fully react.
[0008] As a preferred implementation, the waste phosphoric acid storage chamber is fixedly connected with two symmetrical mounting frames at the lower end of the filter plate frame, and a plurality of uniformly distributed pulleys are rotatably connected in the mounting frames, so that the filter plate frame can be conveniently taken out through the mounting frames and the iron phosphate crystals can be conveniently obtained.
[0009] As a preferred implementation, the reaction box is fixedly connected with a recycling pump and a recycling input pipe at the top end, the output end of the recycling pump is fixedly connected with the recycling input pipe through a connecting pipe, the bottom end of the recycling tank is fixedly connected with a recycling tank output connector, and the recycling tank output connector is fixedly connected with the input end of the recycling pump through a connecting pipe, so that the concentrated phosphoric acid waste liquid in the recycling tank can be recycled into the reaction box for reaction, thereby improving the utilization rate.
[0010] As a preferred implementation, the filter plate is embedded in the filter plate frame, and the filter plate frame is inclined, and the lower end is away from the electric control valve, so that the electric control valve is prevented from being blocked by a large amount of crystals at the lower end.
[0011] As a preferred implementation, the filter plate frame is fixedly connected with a blocking plate at the lower end, so that the iron phosphate crystals are prevented from falling off when the filter plate frame is pulled out.
[0012] As a preferred implementation, the recycling input pipe is fixedly connected with a dispersing disc at the output end, and a plurality of nozzles are installed at the bottom end of the dispersing disc, so that the spraying area of the phosphoric acid waste liquid is expanded by the dispersing disc, the heat contact area is increased, the concentration effect is improved, the temperature in the recycling tank is controlled below 158℃, the boiling point of 85% phosphoric acid is 158℃, and the concentration of the concentrated phosphoric acid is closer to 85%. Considering the heat loss, the concentration of the phosphoric acid is generally between 70% and 85%.
[0013] Compared with the prior art, the advantages and positive effects of the utility model are as follows:
[0014] 1. The utility model discloses a further reaction of the iron oxide and phosphoric acid generated in the early stage of Fenton process sludge pre-treatment in the reaction storage chamber to generate iron phosphate, which can effectively utilize the metal raw materials in the Fenton process sludge to prepare iron phosphate, has the function of recycling the metal elements in the Fenton process sludge, can realize the reuse of resources, and reduces the waste of resources. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 A structure diagram of a phosphoric acid acid-dissolution recycling device based on Fenton process sludge treatment is provided in the utility model.
[0016] Figure 2 A three-dimensional structure diagram of the inside of a reaction box of a phosphoric acid acid-dissolution recycling device based on Fenton process sludge treatment is provided in the utility model.
[0017] Figure 3 A three-dimensional structure diagram of the inside of a recycling box of a phosphoric acid acid-dissolution recycling device based on Fenton process sludge treatment is provided in the utility model.
[0018] Figure 4 A three-dimensional structure diagram of the filter screen frame of a phosphoric acid acid-dissolution recycling device based on Fenton process sludge treatment is provided in the utility model.
[0019] (All the above Figure 1 - Figure 4 The front end box plate of the box body is removed for clear expression, and the actual recycling box and the reaction box are all provided with box plates on four sides)
[0020] LEGEND:
[0021] 1. Reaction box; 101. Reaction storage chamber; 102. Waste phosphoric acid storage chamber; 2. Recycling box; 3. Stirring shaft; 4. Driving motor; 5. Electric control valve; 6. Recycling pump; 7. Recycling input pipe; 8. Recycling pump; 9. Recycling input pipe; 10. Dispersion disc; 11. Heat pipe; 12. Reaction box output connector; 13. Recycling box output connector; 14. Filter plate frame; 15. Mounting frame; 16. Pulley; 17. First material input connector; 18. Second material input connector; 19. Pressure relief port; 20. Filter plate; 21. Blocking plate; 22. pH probe; 23. Stirring blade. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0023] Please refer to Figure 1 - Figure 4 The utility model provides a technical scheme: a kind of phosphoric acid acid-dissolution recycling device based on processing fenton process sludge, including reaction box 1 and recovery tank 2, reaction box 1 is divided into reaction storage chamber 101 and waste phosphoric acid storage chamber 102, reaction box 1 top end is fixedly connected with first material input joint 17 and second material input joint 18, reaction storage chamber 101 and waste phosphoric acid storage chamber 102 communication place are provided with electric control valve 5, reaction box 1 is slidably inserted with filter plate frame 14 at waste phosphoric acid storage chamber 102 upper end, reaction box 1 lower end is provided with reaction box output joint 12, recovery tank 2 top end is fixedly connected with recovery pump 8 and recovery input pipe 9, recovery pump 8 output end is fixedly connected with recovery input pipe 9 by connecting pipe, recovery tank 2 is provided with multiple heat pipes 11, heat pipe 11 input end is connected with external steam heat exchanger, reaction box 1 and recovery tank 2 top end are fixedly connected with pressure relief port 19, the communication state between reaction storage chamber 101 and phosphoric acid storage chamber 102 can be controlled by adjusting electric control valve 5, so that the mixed solution after reaction is quickly filtered into phosphoric acid storage chamber 102, the present application is further reacted to generate iron phosphate by inputting iron oxide and phosphoric acid into reaction storage chamber 101, sludge produced by fenton process is used to prepare iron phosphate, the function of recycling metal elements in fenton process sludge is realized, resource reuse is realized, and resource waste is reduced.
[0024] As Figure 1 - Figure 4 As shown, pH probe 22 is fixedly connected on the inner wall of reaction storage chamber 101, and the pH probe 22 is electrically connected with an external display, so that the solution acidity and alkalinity inside the reaction storage chamber 101 can be determined through the pH probe 22, and the reaction can be judged conveniently.
[0025] As Figure 1 - Figure 4 As shown, stirring shaft 3 is fixedly connected to the middle of the top end of reaction box 1, and drive motor 4 is rotatably connected in reaction storage chamber 101, and the output shaft of the drive motor 4 is fixedly connected with the stirring shaft 3, and a plurality of stirring blades 23 are uniformly fixedly connected to the outer periphery of the stirring shaft 3, so that the mixed solution in the reaction storage chamber 101 can be stirred to fully react through the cooperation of the stirring shaft 3 and the stirring blades 23.
[0026] As Figure 1 - Figure 4 As shown, two symmetrical mounting racks 15 are fixedly connected to the lower end of the filter plate frame 14 in the waste phosphoric acid storage chamber 102, and a plurality of uniformly distributed pulleys 16 are rotatably connected in the mounting racks 15, so that the filter plate frame 14 can be taken out more conveniently through the cooperation of the mounting racks 15 and the pulleys 16, thereby facilitating the obtaining of iron phosphate crystals.
[0027] As Figure 1 -Figure 4 As shown, the reaction tank 1 top end fixedly connected with the recycling pump 6 and recycling input pipe 7, recycling pump 6 output end through the connecting pipe with recycling input pipe 7 fixedly connected, recycling tank 2 bottom end fixedly connected with recycling tank output connector 13, recycling tank output connector 13 through the connecting pipe with recycling pump 6 input end fixedly connected, so that the recycling tank 2 in the condensed phosphoric acid waste liquid into the reaction tank 1 for reaction, improve the utilization rate.
[0028] As shown in Figure 1 - Figure 4 As shown, the filter plate frame 14 embedded with filter plate 20, and filter plate frame 14 is inclined to set, low end away from the electric control valve 5 set, can prevent the electric control valve 5 end a large number of crystal accumulation in one place affect the filtering effect.
[0029] As shown in Figure 1 - Figure 4 As shown, the filter plate frame 14 low end fixedly connected with the blocking plate 21, through the setting of blocking plate 21, can prevent the pull out filter plate frame 14 when the iron phosphate crystal drop.
[0030] As shown in Figure 1 - Figure 4 As shown, the recycling input pipe 9 output end fixedly connected with the dispersion disc 10, the dispersion disc 10 bottom end is installed with a plurality of spray head, can through the dispersion disc 10 to expand the spraying area of phosphoric acid waste liquid, increase the heat contact area of phosphoric acid waste liquid, so as to improve the concentration effect, and the temperature in the recycling tank 2 is controlled below 158 ℃, because the boiling point of 85% phosphoric acid is 158 ℃, so the concentration of phosphoric acid after concentration will be more close to 85%. Considering the loss of heat, the concentration of phosphoric acid is generally between 70% and 85%.
[0031] Working principle: the equipment of the patent is mainly divided into two stages
[0032] The first stage: reaction stage
[0033] This stage uses industrial phosphoric acid and Fenton process sludge generated in the early stage of iron oxide powder as raw material. The reaction storage chamber 101 input into a certain amount of phosphoric acid, and the pH probe is used to control the pH to about 1, then gradually add the iron oxide powder, and the driving motor 4 is used to cooperate with the stirring shaft 3 and the stirring blade 23 to stir and make it fully react. During the reaction process, water is generated due to the consumption of acid, and the pH of the mixed solution gradually rises. When the pH reaches 1.8, the generated iron phosphate can form crystals. In order to ensure the utilization rate of phosphoric acid, the pH can be slightly increased, but it needs to be controlled below 2. After generating sufficient crystals, open the electric control valve 5 to make the mixed liquid and iron phosphate crystals flow to the filter plate. The mixed liquid passes through the filter plate 20 and enters the waste phosphoric acid storage chamber 102, and the iron phosphate crystals remain on the filter plate 20. The filter plate frame 14 is extracted to realize the recycling of iron phosphate crystals.
[0034] Second stage: recovery stage
[0035] The phosphoric acid in the waste phosphoric acid storage chamber 102 is sprayed into the recovery tank 2 by the recovery pump 8 cooperating with the recovery input pipe 9 and the dispersing disc 10, and the phosphoric acid is concentrated by the steam input into the steam heat exchanger and the heat evaporation effect of the heat pipe 11, the steam inlet temperature is controlled to be slightly lower than 158℃, which can ensure that the concentration of the recovered phosphoric acid is between 70% and 85%, which can meet the requirement of being used as a raw material in the reaction stage.
[0036] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, and any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still belong to the protection scope of the technical scheme of the present application.
Claims
1. A phosphoric acid acid digestion based reclamation device for treating Fenton process sludge, comprising a reaction tank (1) and a recovery tank (2), characterized in that, The reaction box (1) is divided into a reaction storage chamber (101) and a waste phosphoric acid storage chamber (102), the top end of the reaction box (1) is fixedly connected with a first material input joint (17) and a second material input joint (18), an electric control valve (5) is arranged at the communication output of the reaction storage chamber (101) and the waste phosphoric acid storage chamber (102), a filter plate frame (14) is slidably inserted into the upper end of the waste phosphoric acid storage chamber (102), a reaction box output joint (12) is arranged at the lower end of the reaction box (1), a recovery pump (8) and a recovery input pipe (9) are fixedly connected to the top end of the recovery box (2), the output end of the recovery pump (8) is fixedly connected with the recovery input pipe (9) through a connecting pipe, a plurality of heat pipes (11) are arranged in the recovery box (2), the input end of the heat pipe (11) is connected with an external steam heat exchanger, and the top end of the recovery box (2) and the reaction box (1) is fixedly connected with a pressure relief port (19).
2. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 1, characterized in that: The pH probe (22) is fixedly connected to the inner wall of the reaction storage chamber (101).
3. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 1, characterized in that: The stirring shaft (3) is fixedly connected to the middle part of the top end of the reaction box (1), the driving motor (4) is rotatably connected to the reaction storage chamber (101), the output end of the stirring shaft (3) is fixedly connected with the output end of the driving motor (4), and a plurality of stirring blades (23) are uniformly fixedly connected to the outer periphery of the stirring shaft (3).
4. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 1, characterized in that: The two symmetrical mounting racks (15) are fixedly connected to the lower end of the filter plate frame (14) in the waste phosphoric acid storage chamber (102), and a plurality of uniformly distributed pulleys (16) are rotatably connected in the mounting rack (15).
5. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 1, characterized in that: The recycling pump (6) and the recycling input pipe (7) are fixedly connected to the top end of the reaction box (1), the output end of the recycling pump (6) is fixedly connected with the recycling input pipe (7) through a connecting pipe, the recovery box output joint (13) is fixedly connected to the bottom end of the recovery box (2), and the recovery box output joint (13) is fixedly connected with the input end of the recycling pump (6) through a connecting pipe.
6. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 1, characterized in that: The filter plate (20) is embedded in the filter plate frame (14), and the filter plate frame (14) is arranged in an inclined manner, and the low end is away from the electric control valve (5).
7. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 6, characterized in that: The blocking plate (21) is fixedly connected to the low end of the filter plate frame (14).
8. A device for recycling of phosphoric acid based on treatment of Fenton process sludge according to claim 1, characterized in that: The dispersion disc (10) is fixedly connected to the output end of the recovery input pipe (9), and a plurality of nozzles are mounted at the bottom end of the dispersion disc (10).