Purification system of ferrous sulfate monohydrate mother liquor
By introducing a purification system in the production of ferrous sulfate monohydrate, and recycling metatitanic acid using pipeline mixers and settlement devices, the problem of direct mother liquor emission is solved, and resource recycling and production efficiency are improved.
Patent Information
- Application Number
- CN202422012163.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-20
AI Technical Summary
In the traditional ferrous sulfate monohydrate production process, the mother liquor contains more ferrous sulfate monohydrate and metatitanic acid are directly discharged, resulting in high pressure, high cost and waste of resources.
A purification system using ferrous sulfate mother liquor monohydrate, including a pipeline mixer and a settlement device, is realized by adding a purifier and using an interlaced baffle and a controller, and the sedimentation recovery of metatitanic acid can be reused.
It improves the purification efficiency of mother liquor, reduces the pressure and cost of wastewater treatment, realizes the recycling and utilization of resources, and improves the production efficiency and system stability.
Smart Images
Figure CN223087671U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of monohydrate ferrous sulfate mother liquor treatment equipment, and particularly relates to a purification system for monohydrate ferrous sulfate mother liquor. Background Art
[0002] The traditional wet production process of monohydrate ferrous sulfate is as follows: solid ferrous sulfate heptahydrate is put into a pulping tank, heated and pulped for dissolution with steam in the pulping tank. During the dissolution process, a small amount of dilute sulfuric acid with a concentration of 25% is added to adjust the acidity of the pulping material, and then a small amount of iron powder is added. Then, the dissolved ferrous sulfate solution is transported to a wet crystallization tank by a water pump for heating to evaporate water. In the wet crystallization tank, the ferrous sulfate solution gradually dehydrates and turns into grayish-white monohydrate ferrous sulfate crystals. When all the ferrous sulfate solution in the crystallization tank turns grayish-white, the mixed liquid is separated by a centrifuge, and the solid is the monohydrate ferrous sulfate crystal product. After the solid-liquid separation of the ferrous sulfate mother liquor, a part of it is returned to the pulping tank for reuse, and the remaining ferrous sulfate mother liquor is sent to a cooling tank for cooling, and then monohydrate ferrous sulfate crystals are recovered by a centrifuge. The remaining ferrous sulfate cooling liquid is sent to a sewage treatment station for neutralization treatment.
[0003] The above traditional wet production process of monohydrate ferrous sulfate has the following defects:
[0004] After investigation, about 29.6% of ferrous sulfate is still dissolved in the filtrate generated during the solid-liquid separation of monohydrate ferrous sulfate. Some of the high-temperature ferrous sulfate mother liquor after solid-liquid separation needs to be cooled to recover monohydrate ferrous sulfate crystals; for the other part of the mother liquor, due to the enrichment of calcium and magnesium impurities in it after multiple times, it can no longer be effectively treated and is directly discharged to the wastewater treatment system. At the same time, the metatitanic acid mixed in the ferrous sulfate is also discharged with the monohydrate ferrous sulfate mother liquor, which not only wastes resources but also increases the sewage treatment cost. Content of the Utility Model
[0005] The utility model aims to solve the problem that in the prior art, the monohydrate ferrous sulfate mother liquor discharged in the process of producing monohydrate ferrous sulfate contains more monohydrate ferrous sulfate and metatitanic acid. After directly entering the subsequent wastewater treatment system, it significantly increases the sewage treatment pressure and treatment cost, and also wastes the titanium source.
[0006] In order to achieve the above invention purpose, the technical solution of the utility model is as follows:
[0007] A purification system for monohydrate ferrous sulfate mother liquor includes a pipe mixer and a sedimentation device. The feed port end of the pipe mixer is connected to the monohydrate ferrous sulfate mother liquor pipeline, the discharge port end of the pipe mixer is communicated with the sedimentation device, a purification agent feeding pipeline is connected near the feed port of the pipe mixer, a metatitanic acid discharge port is arranged at the bottom of the sedimentation device; a clear liquid outlet is arranged at the lower part of the sedimentation device.
[0008] Furthermore, the other end of the ferrous sulfate monohydrate mother liquor pipeline is connected to a storage tank for collecting the ferrous sulfate monohydrate mother liquor generated by the ferrous sulfate monohydrate production system.
[0009] Furthermore, after the ferrous sulfate monohydrate mother liquor pipeline extends into the sedimentation device, the outlet of the ferrous sulfate monohydrate mother liquor pipeline is close to the metatitanic acid discharge port of the sedimentation device.
[0010] Furthermore, a number of baffles are provided in the pipe mixer, and the baffles are arranged staggeredly.
[0011] Furthermore, the baffles are arranged at an angle of 30° to 90° with the fluid conveying direction.
[0012] Furthermore, the purifying agent feeding pipeline is connected to a purifying agent mixing tank, and the position of the purifying agent mixing tank is higher than that of the pipe mixer.
[0013] Furthermore, a flowmeter I and a valve I are provided on the ferrous sulfate monohydrate mother liquor pipeline, and a flowmeter II and a valve II are provided on the purifying agent feeding pipeline.
[0014] Furthermore, the purification system further includes a controller. The valve I and the valve II are solenoid valves, and the controller is respectively connected to the flowmeter I, the flowmeter II, the valve I and the valve II for control.
[0015] Furthermore, a jacket through which a heat exchange medium passes is provided outside the sedimentation device.
[0016] Furthermore, the metatitanic acid discharge port is connected to a metatitanic acid recovery system through pipeline II, and the clear liquid outlet is connected to the ferrous sulfate monohydrate production system through pipeline III.
[0017] Advantages of the present utility model:
[0018] 1. In the present utility model, by using the present purification system, metatitanic acid can be recovered as much as possible. At the same time, the clear liquid after sedimentation and purification treatment can be recycled to the production systems of reagents such as ferrous sulfate monohydrate or polyferric sulfate, significantly reducing the wastewater discharge, reducing the pressure and treatment cost of subsequent wastewater treatment, being environmentally friendly, and the metatitanic acid recovered by the purification system can be sent to the metatitanic acid recovery system for recycling to avoid waste of titanium source. In addition, the purification system has a high purification efficiency for the mother liquor, and the sedimentation rate of the mother liquor is fast, and continuous production can be realized, improving production efficiency.
[0019] Second, in the present utility model, the other end of the monohydrate ferrous sulfate mother liquor pipeline is connected to a storage tank for collecting the monohydrate ferrous sulfate mother liquor generated by the monohydrate ferrous sulfate production system, which is beneficial to the stable operation of the purification system. At the same time, the purification system can also be connected to multiple production systems. After the storage tank collects the monohydrate ferrous sulfate mother liquor to a certain amount, it can stably transport the materials to the rear end, ensuring the stable and continuous operation of the system.
[0020] Third, in the present utility model, after the monohydrate ferrous sulfate mother liquor pipeline extends into the sedimentation device, the outlet of the monohydrate ferrous sulfate mother liquor pipeline is close to the metatitanic acid discharge port of the sedimentation device, avoiding the newly input monohydrate ferrous sulfate mother liquor from remixing and dispersing the stratified materials again, and improving the sedimentation efficiency.
[0021] Fourth, in the present utility model, several baffles arranged alternately in the pipe mixer help to completely mix the monohydrate ferrous sulfate mother liquor and the purifying agent entering the pipe mixer evenly before sending them into the sedimentation device, accelerating the mixing speed of the monohydrate ferrous sulfate mother liquor and the purifying agent, and improving the purification efficiency. Preferably, the baffles are arranged at an angle of 30° to 90° with the fluid transportation direction, which is beneficial to the mixing of the materials.
[0022] Fifth, in the present utility model, the purifying agent feeding pipeline is connected to the purifying agent mixing tank. The position of the purifying agent mixing tank is higher than that of the pipe mixer, which helps to smoothly send the purifying agent in the purifying agent mixing tank into the pipe mixer through the purifying agent feeding pipeline. The purifying agent mixing tank arranged above the pipe mixer is convenient for saving the occupied space of the equipment.
[0023] Sixth, in the present utility model, a flowmeter I and a valve I are provided on the pipeline I, and a flowmeter II and a valve II are provided on the purifying agent feeding pipeline. The input amounts of the materials in the pipeline I and the purifying agent feeding pipeline can be monitored through the flowmeter I and the flowmeter II, ensuring that the addition amount of the purifying agent and the sulfuric acid in the monohydrate ferrous sulfate mother liquor are in a dynamic balance state, and further controlling the input amount of the purifying agent, so as to ensure the sedimentation effect of the mixed materials in the sedimentation device. Preferably, the purification system further includes a controller. The valve I and the valve II are preferably solenoid valves. The controller is respectively connected to the flowmeter I, the flowmeter II, the valve I and the valve II for control connection to achieve automatic control.
[0024] Seventh, in the present utility model, a jacket through which a heat exchange medium passes is provided outside the sedimentation device. By introducing a medium with an appropriate temperature into the jacket, the treatment effect of the sedimentation device on the materials can be improved, and the effect of saving energy can be achieved at the same time. Brief Description of the Drawings
[0025] Figure 1 It is a structural schematic diagram of Embodiment 1.
[0026] Figure 2 It is a structural schematic diagram of Embodiment 2.
[0027] Figure 3 It is a schematic structural diagram of an implementation mode of a pipeline mixer.
[0028] Figure 4 It is a schematic structural diagram of another implementation mode.
[0029] Figure 5 It is a schematic structural diagram of yet another implementation mode.
[0030] Figure 6 It is a schematic structural diagram of another preferred implementation mode.
[0031] Among them, 1. Ferrous sulfate monohydrate mother liquor pipeline; 2. Pipeline mixer; 3. Settling device; 4. Storage tank; 5. Purifying agent feeding pipeline; 6. Purifying agent mixing tank; 7. Flowmeter I; 8. Valve I; 9. Flowmeter II; 10. Valve II; 11. Jacket; 12. Pipeline II; 13. Metatitanic acid recovery system; 14. Pipeline III; 15. Ferrous sulfate monohydrate production system; 16. Controller; 2.1. Feed inlet; 2.2. Discharge outlet; 2.3. Baffle; 3.1. Metatitanic acid discharge port; 3.2. Clear liquid outlet. Specific implementation mode
[0032] The following further details the present utility model in conjunction with embodiments, but the implementation modes of the present utility model are not limited thereto.
[0033] Embodiment 1
[0034] The purification system of ferrous sulfate monohydrate mother liquor belongs to the technical field of ferrous sulfate monohydrate mother liquor treatment equipment. Refer to Figure 1 , including a pipeline mixer 2 and a settling device 3. The feed inlet 2.1 end of the pipeline mixer 2 is connected to the ferrous sulfate monohydrate mother liquor pipeline 1, the discharge outlet 2.2 end of the pipeline mixer 2 is communicated with the settling device 3, a purifying agent feeding pipeline 5 is connected near the feed inlet 2.1 of the pipeline mixer 2, a metatitanic acid discharge port 3.1 is opened at the bottom of the settling device 3; a clear liquid outlet 3.2 is provided at the lower part of the settling device 3.
[0035] This embodiment is a relatively basic implementation mode. Refer to Figure 1, the ferrous sulfate monohydrate mother liquor produced by the original ferrous sulfate monohydrate production system 15 and ready to be discharged into the sewage treatment system is transported through the ferrous sulfate monohydrate mother liquor pipeline 1 to the pipeline mixer 2. Meanwhile, a purifying agent is added through the purifying agent feeding pipeline 5, and the materials are fully mixed by the pipeline mixer 2. Then, the fully mixed materials are sent to the sedimentation device 3 for treatment. The ferrous sulfate monohydrate mother liquor after sedimentation by the sedimentation device 3, the clarified liquid obtained after purification treatment flows into the ferrous sulfate monohydrate production system 15 or the polyferric sulfate production system through pipeline Ⅲ for reuse; the thick slurry is discharged through the metatitanic acid discharge port 3.1, or the logistics rich in metatitanic acid is recycled.
[0036] Preferably, after the ferrous sulfate monohydrate mother liquor pipeline 1 extends into the sedimentation device 3, the outlet of the ferrous sulfate monohydrate mother liquor pipeline 1 is close to the metatitanic acid discharge port 3.1 of the sedimentation device 3, avoiding the newly input ferrous sulfate monohydrate mother liquor from remixing the stratified materials again and improving the sedimentation efficiency.
[0037] Example 2
[0038] This example is a further optimization based on Example 1. The difference is that, referring to Figure 2 , the other end of the ferrous sulfate monohydrate mother liquor pipeline 1 is connected with a storage tank 4. The storage tank 4 is used to collect the ferrous sulfate monohydrate mother liquor produced by the ferrous sulfate monohydrate production system 15. Compared with the solution of Example 1, the storage tank 4 can collect the ferrous sulfate monohydrate mother liquor to a certain amount and then stably transport the materials to the backend, ensuring the stable and continuous operation of the system.
[0039] Example 3
[0040] The difference between this example and Examples 1 - 2 is that several baffles 2.3 are provided in the pipeline mixer 2. Referring to Figure 3 , the baffles 2.3 are arranged staggeredly.
[0041] Example 4
[0042] The difference between this example and Example 3 is that the baffles 2.3 are preferably arranged at an angle of 30 - 90° with the fluid transportation direction. Referring to Figure 3 Or 4, Figure 3 Figure 4 shows the illustration of the baffles 2.3 arranged at an angle of 45° with the fluid transportation direction; Figure 4 The baffles 2.3 in are arranged at an angle of 90° with the fluid transportation direction. For specific examples, adjustments are made according to requirements.
[0043] Example 5
[0044] The difference between this example and Examples 1 - 4 is that the purifying agent feeding pipeline 5 is connected with a purifying agent mixing tank 6. Referring to Figure 4, the position of the purifying agent mixing tank 6 is higher than that of the pipeline mixer 2.
[0045] Example 6
[0046] Compared with Examples 1-5, the difference in this example is as follows. Refer to Figure 4 , a flowmeter I 7 and a valve I 8 are provided on the pipeline I 4, and a flowmeter II 9 and a valve II 10 are provided on the purifying agent feeding pipeline 5.
[0047] Example 7
[0048] This example is a further optimization of Example 6. The difference is that the purification system further includes a controller 16. Refer to Figure 5 , the valve II 10 is a solenoid valve, and the controller 16 is respectively connected to the flowmeter I 7, the flowmeter II 9 and the valve II 10 for control.
[0049] Preferably, a jacket 11 through which a heat exchange medium flows is provided outside the sedimentation device 3.
[0050] Example 8
[0051] Compared with Examples 1-7, the difference in this example is as follows. Refer to Figure 6 , the metatitanic acid discharge port 3.1 is connected to the metatitanic acid recovery system 13 through a pipeline II 12, and the clear liquid outlet 3.2 is connected to the ferrous sulfate monohydrate production system 15 through a pipeline III 14.
[0052] Example 9
[0053] Taking a relatively optimal purification system for ferrous sulfate monohydrate mother liquor as an example, this example further illustrates the present solution.
[0054] Refer to Figure 6 , the purification system includes a purification system for ferrous sulfate monohydrate mother liquor, including a pipeline mixer 2 and a sedimentation device 3. The feed port 2.1 end of the pipeline mixer 2 is connected to the ferrous sulfate monohydrate mother liquor pipeline 1, the discharge port 2.2 end of the pipeline mixer 2 communicates with the sedimentation device 3, the purification agent feeding pipeline 5 is connected near the feed port 2.1 of the pipeline mixer 2, and a metatitanic acid discharge port 3.1 is opened at the bottom of the sedimentation device 3; a clear liquid outlet 3.2 is provided at the lower part of the sedimentation device 3. The other end of the ferrous sulfate monohydrate mother liquor pipeline 1 is connected to a storage tank 4, and the storage tank 4 is used to collect the ferrous sulfate monohydrate mother liquor produced by the ferrous sulfate monohydrate production system 15. After the ferrous sulfate monohydrate mother liquor pipeline 1 extends into the sedimentation device 3, the outlet of the ferrous sulfate monohydrate mother liquor pipeline 1 is close to the metatitanic acid discharge port 3.1 of the sedimentation device 3.
[0055] In this embodiment, the pipeline mixer 2 is provided with a plurality of baffles 2.3, and the baffles 2.3 are arranged in a staggered manner. The baffles 2.3 help to allow the ferrous sulfate monohydrate mother solution and the purifier entering the pipeline mixer 2 to be completely mixed and then enter the sedimentation device 3. The baffles 2.3 are arranged at an angle of 90° with the fluid conveying direction.
[0056] In this embodiment, the purifier feeding pipeline 5 is connected to the purifier mixing tank 6 , and the purifier mixing tank 6 is located higher than the pipeline mixer 2 .
[0057] In this embodiment, the purification system further includes a controller 16, a flow meter I7 and a valve I8 are provided on the pipeline I4, a flow meter II9 and a valve II10 are provided on the purifier feeding pipeline 5, the valve I8 and the valve II10 are electromagnetic valves, and the controller 16 is respectively connected to the flow meter I7, the flow meter II9, the valve I8 and the valve II10. The controller 16 is a PLC controller 16.
[0058] In this embodiment, a jacket 11 through which a heat exchange medium flows is provided on the outside of the sedimentation device 3 .
[0059] In this embodiment, the titanic acid discharge port 3.1 is connected to the titanic acid recovery system 13 through the pipeline II 12, and the clear liquid outlet 3.2 is connected to the ferrous sulfate monohydrate production system 15 through the pipeline III 14.
[0060] In this embodiment, the ferrous sulfate monohydrate mother liquor produced by the original ferrous sulfate monohydrate production system 15 and ready to be discharged into the sewage treatment system is temporarily stored in the storage tank 4, and the controller 16 controls the flow of the ferrous sulfate monohydrate mother liquor into the system, and at the same time links the opening size of the valve II 10 to ensure that the purifier and the ferrous sulfate monohydrate mother liquor are in a dynamic equilibrium state. The ferrous sulfate monohydrate mother liquor is precipitated by the sedimentation device 3, and the clear liquid obtained after purification treatment flows into the ferrous sulfate monohydrate production system 15 through the pipeline III 14 for reuse; the thick slurry is discharged through the titanic acid discharge port 3.1, and flows into the titanic acid recovery system 13 through the pipeline II 12 for recycling.
Claims
1. A purification system for ferrous sulfate monohydrate mother liquor, characterized in that: It includes a pipeline mixer (2) and a sedimentation device (3). The feed port (2.1) end of the pipeline mixer (2) is connected to a ferrous sulfate monohydrate mother liquor pipeline (1). The discharge port (2.2) end of the pipeline mixer (2) is communicated with the sedimentation device (3). A purifying agent feeding pipeline (5) is connected near the feed port (2.1) of the pipeline mixer (2). A metatitanic acid discharge port (3.1) is opened at the bottom of the sedimentation device (3); a clear liquid outlet (3.2) is provided at the lower part of the sedimentation device (3).
2. The purification system of ferrous sulfate monohydrate mother liquor according to claim 1, wherein: The other end of the ferrous sulfate monohydrate mother liquor pipeline (1) is connected to a storage tank (4), and the storage tank (4) is used for collecting the ferrous sulfate monohydrate mother liquor generated by the ferrous sulfate monohydrate production system (15).
3. The purification system for the ferrous sulfate monohydrate mother liquor according to claim 1, wherein: After the ferrous sulfate monohydrate mother liquor pipeline (1) extends into the sedimentation device (3), the outlet (1.1) of the ferrous sulfate monohydrate mother liquor pipeline (1) is close to the metatitanic acid discharge port (3.1) of the sedimentation device (3).
4. The purification system of the ferrous sulfate monohydrate mother liquor according to claim 1, wherein: A number of baffles (2.3) are provided in the pipeline mixer (2), and the baffles (2.3) are arranged staggeredly.
5. The purification system of the ferrous sulfate monohydrate mother liquor according to claim 4, wherein: The baffles (2.3) are arranged at an angle of 30-90° with the fluid conveying direction.
6. The purification system of the ferrous sulfate monohydrate mother liquor according to claim 1, wherein: The purifying agent feeding pipeline (5) is connected to a purifying agent mixing tank (6), and the position of the purifying agent mixing tank (6) is higher than that of the pipeline mixer (2).
7. The purification system for the ferrous sulfate monohydrate mother liquor according to claim 1, wherein: A flowmeter I (7) and a valve I (8) are provided on the ferrous sulfate monohydrate mother liquor pipeline (1), and a flowmeter II (9) and a valve II (10) are provided on the purifying agent feeding pipeline (5).
8. The purification system for the ferrous sulfate monohydrate mother liquor according to claim 7, wherein: The purification system further includes a controller (16). The valve I (8) and the valve II (10) are solenoid valves, and the controller (16) is respectively connected to the flowmeter I (7), the flowmeter II (9), the valve I (8) and the valve II (10) for control.
9. The purification system of the ferrous sulfate monohydrate mother liquor according to claim 1, wherein: A jacket (11) through which a heat exchange medium flows is provided outside the sedimentation device (3).
10. The purification system of the ferrous sulfate monohydrate mother liquor according to claim 1, wherein: The metatitanic acid discharge port (3.1) is connected to a metatitanic acid recovery system (13) through a pipeline II (12), and the clear liquid outlet (3.2) is connected to the ferrous sulfate monohydrate production system (15) through a pipeline III (14).