Inorganic ion induced crystallization system

Abstract

The invention belongs to the technical field of water treatment, and relates to an inorganic ion induced crystallization system which comprises a treatment cylinder, a seed crystal conveying device, a stirring assembly and a circulating cylinder, and the precipitation separation assembly is arranged in the solid-liquid separation area and is used for separating the non-refluxed induction seed crystal. According to the method, induced crystallization of ions in water is taken as a removal mechanism, an ion reaction energy barrier in water is reduced through the induced seed crystal, reaction of hardness ions, alkalinity ions, sulfate ions and the like is promoted, crystals are generated, the crystals are attached to the surface of the induced seed crystal and are removed from water, pollutants such as waste salt and sludge are avoided, and the method is suitable for industrial production. Meanwhile, through cooperation of the circulating barrel, the precipitation separation assembly and the stirring assembly, induced seed crystal backflow is formed in the treatment barrel, stirring is conducted through the stirring assembly, the mixed reaction time of the induced seed crystal and raw water is prolonged, the crystallization efficiency is improved, and therefore the softening and desalting efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment and relates to an inorganic ion induced crystallization system. Background Art

[0002] High-hardness water quality in my country exhibits distinct regional distribution patterns and systemic hazards. Geographically, high-hardness water (total hardness >300 mg / L) exhibits a distinct "high in the north, low in the south" pattern. Groundwater hardness in North China generally ranges from 300 mg / L to 600 mg / L, with deep confined water exceeding 800 mg / L. In the arid northwest, affected by intense evaporation and concentration, surface water and shallow groundwater hardness range from 400 mg / L to 1000 mg / L, with some closed-flow areas exceeding 2000 mg / L. This distribution pattern is closely related to regional geological structure, climate conditions, and human activities. The harm caused by high-hardness water has multifaceted impacts. In the public sector, long-term consumption of high-hardness water significantly increases the risk of urinary tract diseases. In industrial production, scaling reduces equipment heat exchange efficiency by 15% to 30%, resulting in annual economic losses exceeding 10 billion yuan. In agricultural irrigation, high-hardness water causes soil compaction and salinization, impacting crop yields.

[0003] Currently, mainstream water treatment technologies, such as ion exchange and chemical precipitation, have emerged to address the issue of high water hardness. While these technologies can reduce water hardness to a certain extent in practice, they all suffer from low treatment efficiency and high levels of pollutants. While ion exchange offers relatively stable treatment results, its resin regeneration cycle is short, limiting overall treatment efficiency. Furthermore, the regeneration process produces a large amount of waste salt, a major source of pollutants. While chemical precipitation offers lower costs, its reaction rate is slower, requiring longer treatment times for the same amount of water, resulting in lower treatment efficiency. Furthermore, it produces a significant amount of sludge, amounting to 5 to 8 tons per 10,000 tons of water. This sludge, as a pollutant, places significant pressure on subsequent disposal. Given the shortcomings of existing technologies in terms of softening and desalination efficiency and pollutant reduction, there is an urgent need to develop a water treatment device with superior overall performance. Summary of the Invention

[0004] The object of the present invention is to provide an inorganic ion induced crystallization system that can improve the softening and desalination efficiency while avoiding the generation of pollutants.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: An inorganic ion-induced crystallization system, comprising: The treatment cylinder is arranged vertically, and the interior of the treatment cylinder is divided into a crystallization reaction zone, an internal circulation zone and a solid-liquid separation zone from bottom to top. Water inlets and addition ports are respectively provided on both sides of the treatment cylinder at the positions of the crystallization reaction zone. The water inlet is used to introduce raw water.

[0006] The seed crystal conveying device is connected to the feeding port and is used to add induced crystal seeds into the crystallization reaction zone, and desalination of the raw water is achieved through the induced crystallization effect of the induced crystal seeds to obtain soft water.

[0007] The stirring assembly is arranged in the crystallization reaction zone and is used to stir the induced crystal seeds and the raw water.

[0008] The circulation drum is vertically arranged in the inner circulation area. There is a gap between the circulation drum and the treatment drum. The flow velocity difference between the circulation drum and the gap is used during the water level rising process to force the induced crystal seeds to pass through the circulation drum and then flow back from the gap.

[0009] The precipitation separation component is arranged in the solid-liquid separation zone and is used to separate the induced crystal seeds that are not refluxed.

[0010] The present invention is also characterized in that: A seed mixing barrel is arranged between the seed conveying device and the processing barrel, the first inlet of the seed mixing barrel is connected to the outlet of the seed conveying device, the second inlet of the seed mixing barrel is used to introduce part of the raw water, the first outlet of the seed mixing barrel is connected to the inlet of the first dosing pump, and the outlet of the first dosing pump is connected to the dosing port.

[0011] The stirring components include: The stirring shaft is vertically arranged in the crystallization reaction zone, and the lower end of the stirring shaft passes through the bottom of the treatment cylinder and is located below the treatment cylinder.

[0012] Multiple stirring blades are evenly arranged on the stirring shaft.

[0013] The first motor is arranged at the lower part of the processing cylinder, and the output end of the first motor is connected to the lower end of the stirring shaft.

[0014] The sedimentation separation component is a vertical vortex tube device or an inclined tube sedimentation device.

[0015] A dosing port is provided on the side of the treatment cylinder between the crystallization reaction zone and the internal circulation zone. The dosing port is connected to the outlet of the second dosing pump. The inlet of the second dosing pump is connected to a medicine storage barrel. The medicine storage barrel stores softening agent. A medicine distribution piece is provided near the dosing port in the treatment cylinder. The inlet of the medicine distribution piece is connected to the dosing port. The medicine distribution piece is used to evenly add the softening agent into the treatment cylinder.

[0016] A water collecting tank is provided on the upper part of the treatment cylinder, which is connected to the treatment cylinder. A reflux port is provided on the side of the treatment cylinder near the crystallization reaction zone, which is connected to the outlet of the water collecting tank.

[0017] The outlet of the water collection tank is connected to the inlet of the cyclone separator, which is used to perform initial separation of the induced crystal seeds in the soft water. The first outlet of the cyclone separator is connected to the second inlet of the seed crystal mixing barrel. The second outlet of the cyclone separator is connected to a separation component, which is used to perform secondary separation of the induced crystal seeds in the soft water and separate the microcrystals in the soft water. The separation component is connected to a seed crystal activation component, which is used to activate the microcrystals and induced crystal seeds separated by the separation component to obtain activated induced crystal seeds, and then send the activated induced crystal seeds into the seed crystal mixing barrel.

[0018] The separation components include: Separate the outer cylinder and set it vertically.

[0019] The separation inner cylinder is vertically arranged in the separation outer cylinder. The upper end of the separation inner cylinder is a closed structure. The separation inner cylinder is connected to the second outlet of the cyclone separator through a water inlet pipe, and the water inlet pipe passes through the separation outer cylinder.

[0020] The first storage box stores a seed crystal separation aid therein, and the outlet of the first storage box is connected to the water inlet pipe via a third dosing pump.

[0021] The overflow weir is arranged on the upper part of the separation outer cylinder and is communicated with the separation outer cylinder. A water outlet pipe is arranged on one side of the overflow weir.

[0022] The discharge pipe is arranged at the lower part of the separation outer cylinder, and one end of the discharge pipe is communicated with the separation outer cylinder.

[0023] The seed activation components include: The first inlet of the crystal seed activation box is connected to the other end of the discharge pipe, and the outlet of the crystal seed activation box is connected to the third inlet of the crystal seed mixing barrel.

[0024] The second storage box stores the seed crystal activation auxiliary agent therein, and the outlet of the second storage box is connected to the second inlet of the seed crystal activation box via a fourth dosing pump.

[0025] A scraper is provided at the bottom of the separation outer cylinder, a second motor is provided at the lower part of the separation outer cylinder, and the output end of the second motor passes through the lower part of the separation outer cylinder and is connected to the scraper.

[0026] The inorganic ion-induced crystallization system of the present invention has the following advantages: The present invention uses the induced crystallization of ions in water as a removal mechanism, reduces the reaction energy barrier of ions in water by inducing crystal seeds, promotes the reaction of hardness ions with alkalinity ions, sulfate ions and other ions to form crystals, and the crystals are attached to the surface of the induced crystal seeds and removed from the water, avoiding the generation of waste salt, sludge and other pollutants. At the same time, through the cooperation of the circulation cylinder, the sedimentation separation component and the stirring component, the induced crystal seeds are formed in the treatment cylinder. The stirring component is used for stirring, which increases the mixing reaction time of the induced crystal seeds and the raw water, improves the crystallization efficiency, and thus improves the softening and desalination efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the processing cylinder in the present invention.

[0029] Reference numerals: 1. Treatment cylinder, 2. Circulation cylinder, 3. Crystallization reaction zone, 4. Inner circulation zone, 5. Drug distribution parts, 6. Sedimentation separation component, 7. Water collecting tank, 8. Slag discharge port, 9. First motor, 10. Stirring shaft, 11. Stirring blade, 12. Solid-liquid separation zone, 13. Cyclone separator, 14. Seed conveying device, 15. Seed mixing barrel, 16. First dosing pump, 17. Scraper, 18. Second motor, 19. Second dosing pump, 20. Drug storage barrel, 21. First storage box, 22. Third dosing pump, 23. Overflow weir, 24. Water outlet pipe, 25. Separation outer cylinder, 26. Separation inner cylinder, 27. Second storage box, 28. Fourth dosing pump, 29. Seed activation box, 30. Water inlet pipe, 31. Discharge pipe, 32. Water inlet, 33. Dosing port, 34. Dosing port, 35. Reflux port. DETAILED DESCRIPTION

[0030] The technical solutions in the present invention will be described clearly and in detail below with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0031] like Figure 1 、 Figure 2As shown, the present invention provides an inorganic ion induced crystallization system, including a treatment cylinder 1, a seed crystal conveying device 14, a stirring assembly, a circulation cylinder 2 and a precipitation separation assembly 6. The treatment cylinder 1 is vertically arranged, the upper end of the treatment cylinder 1 is open and the lower end is closed. The interior of the treatment cylinder 1 is divided into a crystallization reaction zone 3, an internal circulation zone 4 and a solid-liquid separation zone 12 from bottom to top. The positions of the crystallization reaction zone 3 on both sides of the treatment cylinder 1 are respectively provided with a water inlet 32 ​​and a dosing port 33. The water inlet 32 ​​and the dosing port 33 are both close to the lower part of the treatment cylinder 1. The water inlet 32 ​​is used to introduce raw water, and the seed crystal conveying device 14 is connected to the adding port 33. The seed crystal conveying device 14 is used to add induced crystal seeds into the crystallization reaction zone 3, and the desalination treatment of the raw water is achieved through the induced crystallization effect of the induced crystal seeds. The stirring component is arranged in the crystallization reaction zone 3, and the stirring component is used to stir the induced crystal seeds and the raw water, promote the mixing reaction of the induced crystal seeds and the raw water, and optimize the mixing effect of the induced crystal seeds and the raw water. The circulation drum 2 is vertically arranged in the inner circulation zone 4, and both ends of the circulation drum 2 are open structures. The circulation drum 2 and There is a gap between the treatment tubes 1. The flow velocity difference between the circulation tube 2 and the gap during the water level rise is used to prompt the induced crystal seeds to pass through the circulation tube 2 and then flow back from the gap, that is, the flow velocity in the circulation tube 2 is greater than the gap flow velocity. The sedimentation separation component 6 is arranged in the solid-liquid separation area 12. The sedimentation separation component 6 is used to separate the induced crystal seeds that have not flowed back, so that the induced crystal seeds that have not flowed back flow back to the crystallization reaction area 3 under the action of gravity, and continue to participate in the desalination treatment of the raw water to obtain soft water. The present invention uses the induced crystallization of ions in water as the removal mechanism, reduces the reaction energy barrier of ions in water through the induced crystal seeds, promotes the reaction of hardness ions and alkalinity ions, sulfate ions and other ions to form crystals, and the crystals adhere to the surface of the induced crystal seeds and are removed from the water, avoiding the generation of waste salt, sludge and other pollutants. At the same time, through the cooperation of the circulation tube 2, the sedimentation separation component 6 and the stirring component, the induced crystal seeds are formed in the treatment tube 1 and stirred by the stirring component, which increases the mixing reaction time of the induced crystal seeds and the raw water, improves the crystallization efficiency, and thus improves the softening and desalination efficiency.

[0032] like Figure 1 、 Figure 2 As shown, the treatment barrel 1 is a three-stage variable diameter structure, which improves the internal flow field distribution, optimizes the contact condition between the induced crystal seeds and the raw water, and thus improves the crystallization efficiency.

[0033] like Figure 1 、 Figure 2As shown, a seed mixing barrel 15 is provided between the seed conveying device 14 and the treatment barrel 1, the first inlet of the seed mixing barrel 15 is connected to the outlet of the seed conveying device 14, the second inlet of the seed mixing barrel 15 is used to introduce part of the raw water, the first outlet of the seed mixing barrel 15 is connected to the inlet of the first dosing pump 16, the outlet of the first dosing pump 16 is connected to the dosing port 33, and by mixing the induced seed crystals with the raw water before sending them into the crystallization reaction zone 3, the mixing reaction time of the induced seed crystals and the raw water is further increased, thereby improving the crystallization efficiency.

[0034] like Figure 1 、 Figure 2 As shown, a slag discharge port 8 is provided at the lower part of the treatment cylinder 1 , and a valve is provided on the slag discharge port 8 to facilitate the discharge of waste slag settled at the bottom of the treatment cylinder 1 from the slag discharge port 8 .

[0035] like Figure 1 、 Figure 2 As shown, the stirring assembly includes a stirring shaft 10, a plurality of stirring blades 11 and a first motor 9. The stirring shaft 10 is vertically arranged in the crystallization reaction zone 3. The lower end of the stirring shaft 10 passes through the bottom of the treatment cylinder 1 and is located below the treatment cylinder 1. The plurality of stirring blades 11 are evenly arranged on the stirring shaft 10. The first motor 9 is arranged at the lower part of the treatment cylinder 1. The output end of the first motor 9 is connected to the lower end of the stirring shaft 10.

[0036] Wherein, the sedimentation separation component 6 is a vertical vortex tube device or an inclined tube sedimentation device.

[0037] like Figure 1 、 Figure 2 As shown, a dosing port 34 is provided on the side of the treatment tube 1 between the crystallization reaction zone 3 and the inner circulation zone 4. The dosing port 34 is connected to the outlet of the second dosing pump 19, and the inlet of the second dosing pump 19 is connected to the medicine storage barrel 20. The medicine storage barrel 20 stores a softening agent. A medicine distribution piece 5 is provided near the dosing port 34 in the treatment tube 1. The inlet of the medicine distribution piece 5 is connected to the dosing port 34. The medicine distribution piece 5 is used to evenly add the softening agent into the treatment tube 1. By adding the softening agent to the treatment tube 1, it is convenient to adjust the pH value of the water body, provide a suitable chemical environment for crystallization, and ensure that the softening and desalination process is stable.

[0038] like Figure 1 、 Figure 2 As shown, a water collecting tank 7 is provided on the upper part of the treatment tube 1, and the water collecting tank 7 is connected to the treatment tube 1. A reflux port 35 is provided on the side of the treatment tube 1 near the crystallization reaction zone 3. The reflux port 35 is connected to the outlet of the water collecting tank 7. According to the water quality conditions, part of the soft water can be discharged into the treatment tube 1 through the reflux port 35 for reuse, thereby further improving the softening and desalination efficiency.

[0039] like Figure 1 、 Figure 2As shown, the outlet of the water collection tank 7 is connected to the inlet of the cyclone separator 13, and the cyclone separator 13 is used to perform initial separation of the induced crystal seeds in the soft water. The first outlet of the cyclone separator 13 is connected to the second inlet of the seed mixing barrel 15, and the collected induced crystal seeds are discharged into the seed mixing barrel 15 for reuse. The second outlet of the cyclone separator 13 is connected to the separation component, and the separation component is used to perform secondary separation of the induced crystal seeds in the soft water and separate the microcrystals in the soft water. The particle size of the induced crystal seeds separated by the secondary separation is smaller than the particle size of the induced crystal seeds separated by the primary separation. The separation component is connected to the seed activation component, and the seed activation component is used to activate the microcrystals and induced crystal seeds separated by the separation component to obtain activated induced crystal seeds, and send the activated induced crystal seeds into the seed mixing barrel 15.

[0040] like Figure 1 As shown, the separation assembly includes a separation outer cylinder 25, a separation inner cylinder 26, a first storage tank 21, an overflow weir 23 and a discharge pipe 31. The separation outer cylinder 25 is vertically arranged, the upper end of the separation outer cylinder 25 is open and the lower end is closed, the separation inner cylinder 26 is vertically arranged in the separation outer cylinder 25, the upper end of the separation inner cylinder 26 is a closed structure, the separation inner cylinder 26 is connected to the second outlet of the cyclone separator 13 through the water inlet pipe 30, and the water inlet pipe 30 passes through the separation outer cylinder 25. By feeding soft water into the separation inner cylinder 26, the soft water first flows downward and then flows upward between the separation outer cylinder 25 and the separation inner cylinder 26, and the induced crystal seeds after the reaction are precipitated under the action of gravity. The seeds are deposited at the bottom of the separation outer cylinder 25, and the interior of the first storage tank 21 stores a seed separation aid. The outlet of the first storage tank 21 is connected to the water inlet pipe 30 through the third dosing pump 22. The seed separation aid is used to promote the separation of the induced crystal seeds after the reaction from the soft water. The overflow weir 23 is set at the upper part of the separation outer cylinder 25, and the overflow weir 23 is connected to the separation outer cylinder 25. A water outlet pipe 24 is set on one side of the overflow weir 23. The water outlet pipe 24 is used to discharge the soft water that has been separated. The discharge pipe 31 is set at the lower part of the separation outer cylinder 25, and one end of the discharge pipe 31 is connected to the separation outer cylinder 25. The discharge pipe 31 facilitates the removal of the induced crystal seeds after the reaction.

[0041] like Figure 1 As shown, the seed activation assembly includes a seed activation box 29 and a second storage box 27. The first inlet of the seed activation box 29 is connected to the other end of the discharge pipe 31, and the outlet of the seed activation box 29 is connected to the third inlet of the seed mixing barrel 15. The interior of the second storage box 27 stores a seed activation aid. The outlet of the second storage box 27 is connected to the second inlet of the seed activation box 29 through a fourth dosing pump 28. The seed activation aid is used to restore the activity of the induced seeds after the reaction and then send them to the seed mixing barrel 15 for recycling, thereby reducing the consumption of the induced seeds and thus reducing the cost.

[0042] like Figure 1As shown, a scraper 17 is provided at the bottom of the separation outer cylinder 25, and a second motor 18 is provided at the lower part of the separation outer cylinder 25. The output end of the second motor 18 passes through the lower part of the separation outer cylinder 25 and is connected to the scraper 17. The scraper 17 is driven to rotate by the second motor 18, so that the induced crystal seeds after the reaction in the separation outer cylinder 25 can be discharged.

[0043] Example 1 The raw water to be treated is the reverse osmosis concentrated water produced when treating industrial wastewater. The Ca 2+ The content is 40mmol / L, SO4 2- The content is 66mmol / L, which is a typical high permanent hardness water quality. No softening agent is added during the softening and desalination treatment of this water quality.

[0044] The first motor 9 is started, and the first motor 9 drives the plurality of stirring blades 11 to rotate through the stirring shaft 10 . The stirring blades 11 are of three-blade propulsion type, and are evenly arranged according to the height of the crystallization reaction zone 3 .

[0045] The induction crystal seeds enter the crystal seed mixing barrel 15 through the crystal seed conveying device 14, and after being mixed with the raw water, enter the crystallization reaction zone 3 through the addition port 33. The induction crystal seeds are natural gypsum crystal particles.

[0046] The induced crystal seeds and the raw water are fully contacted and mixed in the crystallization reaction zone 3. When they rise to the inner circulation zone 4, the flow velocity in the circulation drum 2 is greater than the gap flow velocity during the water level rising process, so that the unreacted induced crystal seeds pass through the circulation drum 2 and flow back from the gap. Some of the induced crystal seeds that are not effectively circulated enter the solid-liquid separation zone 12 with the water flow and are separated by the action of the sedimentation separation component 6. The sedimentation separation component 6 uses a vertical vortex tube device.

[0047] After separation, the soft water flows into the water collection tank 7 and then is discharged. 2+ Content ≤20mmol / L, SO4 2- The content is ≤46mmol / L. According to the water quality, part of the effluent can be sent to the crystallization reaction zone 3 through the reflux port 35 for reuse. The soft water enters the cyclone separator 13 for further turbidity removal treatment. The collected suspended matter is discharged into the seed crystal mixing barrel 15 for reuse. The soft water treated by the cyclone separator 13 enters the separation inner cylinder 26 through the water inlet pipe 30. At the same time, the seed crystal separation aid in the first storage tank 21 is sent into the water inlet pipe 30 through the third dosing pump 22 to mix evenly with the soft water and then enter the separation inner cylinder 26 together. The effluent after deep separation is discharged through the water outlet pipe 24 and enters the subsequent treatment unit. At this time, the turbidity in the water is ≤10NTU.

[0048] As the operation time increases, the induced crystal seeds after the reaction are deposited at the bottom of the separation outer cylinder 25 and discharged into the crystal seed activation box 29 through the discharge pipe 31. The crystal seed activation aid in the second storage box 27 is transported into the crystal seed activation box 29 through the fourth dosing pump 28 to activate the induced crystal seeds after the reaction, restore their activity and then send them into the crystal seed mixing barrel 15 for recycling.

[0049] After a certain period of continuous operation, some of the reacted induced crystal seeds with larger particle sizes are discharged and the corresponding amount of original induced crystal seeds are replenished to maintain continuous and stable operation.

[0050] As a preferred solution of this embodiment, the induced seed crystals discharged after the reaction are CaSO4·2H2O with a purity of ≥99%, which can be recycled as a gypsum product after dehydration.

[0051] Example 2 The raw water to be treated is selected as industrial circulating water wastewater, and the Ca 2+ The content is 23.2mmol / L, CO3 2- The content is 1.08mmol / L, HCO3 - The content is 32.3mmol / L, SO4 2- The content is 0.3mmol / L, which is a typical high temporary hardness water quality. The softening agent is NaOH, which is added into the treatment tube 1 through the dosing port 34. The stirring blade 11 is an anchor blade, which is only set at the bottom of the treatment tube 1 and runs at a low speed.

[0052] The induction crystal seeds enter the crystal seed mixing barrel 15 through the crystal seed conveying device 14, and after being mixed with the raw water, enter the crystallization reaction zone 3 through the addition port 33. The induction crystal seeds are natural garnet crystal particles.

[0053] The induced crystal seeds and the raw water are fully contacted and mixed in the crystallization reaction zone 3. When they rise to the inner circulation zone 4, the flow velocity in the circulation drum 2 is greater than the gap flow velocity during the water level rising process, so that the unreacted induced crystal seeds pass through the circulation drum 2 and flow back from the gap. Some of the induced crystal seeds that are not effectively circulated enter the solid-liquid separation zone 12 with the water flow and are separated by the action of the sedimentation separation component 6. The sedimentation separation component 6 uses an inclined tube sedimentation device.

[0054] After separation, the soft water flows into the water collection tank 7 and then is discharged. 2+The content is ≤3mmol / L, the soft water enters the cyclone separator 13 for further turbidity removal, and the collected suspended matter is discharged into the seed crystal mixing barrel 15 for reuse. The soft water treated by the cyclone separator 13 enters the separation inner cylinder 26 through the water inlet pipe 30. At the same time, the seed crystal separation aid in the first storage tank 21 is sent into the water inlet pipe 30 through the third dosing pump 22 to mix evenly with the soft water and then enter the separation inner cylinder 26 together. The effluent after deep separation is discharged through the water outlet pipe 24 and then enters the subsequent treatment unit.

[0055] As the operation time increases, the induced crystal seeds after the reaction are deposited at the bottom of the separation outer cylinder 25 and discharged into the crystal seed activation box 29 through the discharge pipe 31. The crystal seed activation aid in the second storage box 27 is transported into the crystal seed activation box 29 through the fourth dosing pump 28 to activate the induced crystal seeds after the reaction, restore their activity and then send them into the crystal seed mixing barrel 15 for recycling.

[0056] At the same time, as the operation time increases, the induced crystal seeds in the treatment tube 1 continue to grow, and are finally discharged regularly through the slag discharge port 8, and a corresponding amount of original induced crystal seeds are replenished to maintain continuous and stable operation.

[0057] As a preferred solution of this embodiment, the induced crystal seeds discharged after the reaction are calcium carbonate crystal particles with smooth surface and dense texture. After discharge, no dehydration treatment is required and they can be recycled as calcium carbonate products after natural air drying.

[0058] Other advantages of the inorganic ion-induced crystallization system of the present invention are as follows: First, the present invention performs multi-stage recovery of the induced crystal seeds used in the water treatment process and activates and reuses them and collects and processes them as resources according to the condition of the crystal seeds, thereby improving the utilization efficiency of the crystal seeds and further avoiding the generation of pollutants such as waste salt and sludge.

[0059] Second, compared with traditional ion exchange and chemical precipitation methods, the present invention has the advantages of high treatment rate, small footprint, low operating cost and no treatment waste liquid. The crystals produced in water treatment have the characteristics of dense surface structure, easy dehydration, and single composition. After recovery, they can be used as resources, realizing true "zero emission" treatment.

[0060] Third, the present invention improves the internal flow field distribution and optimizes the contact condition between the induced crystal seeds and the raw water by designing the treatment cylinder as a three-stage variable diameter structure, thereby improving the crystallization efficiency. In addition, by arranging the stirring, reflux and sedimentation separation components in a zoned manner, the mutual influence between the various areas is effectively reduced, ensuring the sufficient reaction of the crystal seed reaction zone, the efficient reflux of the internal circulation zone, and the separation effect of the solid-liquid separation zone.

[0061] Fourth, the present invention proposes a process system for collecting, activating and refluxing induced crystal seeds. By deeply separating and activating the induced crystal seeds after the reaction, the induced crystal seeds are fully recovered and activated, effectively solving the problems of low seed utilization, large seed consumption, and decreased seed induced crystallization performance in existing technologies of the same type. At the same time, it optimizes the water quality of the effluent from the induced crystallization system and significantly improves the system treatment effect.

[0062] Fifth, the present invention can flexibly select the process path according to the raw water quality, and choose whether to add softening agents and choose different types of softening agents according to the distribution of hardness ions and anion contents in the raw water. In addition, the effluent return ratio can be determined according to the effluent water quality, which effectively improves the adaptability of the device to raw water of different water qualities, and has achieved significant application effects in the softening and desalination treatment of groundwater, urban sewage treatment plant water, mine water, treated wastewater, thermal power plant wastewater, etc.

[0063] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present invention are intended to be protected by the present invention.

Claims

1. An inorganic ion-induced crystallization system, characterized in that: include: The treatment cylinder (1) is vertically arranged, and the interior of the treatment cylinder (1) is divided into a crystallization reaction zone (3), an internal circulation zone (4) and a solid-liquid separation zone (12) from bottom to top. A water inlet (32) and a dosing port (33) are respectively provided on both sides of the treatment cylinder (1) at positions located in the crystallization reaction zone (3). The water inlet (32) is used to introduce raw water; A seed crystal conveying device (14) is connected to the feeding port (33) and is used to feed induced seed crystals into the crystallization reaction zone (3), thereby desalting the raw water to obtain soft water through the induced crystallization effect of the induced seed crystals; A stirring assembly is provided in the crystallization reaction zone (3) and is used to stir the induced crystal seeds and the raw water; A circulation drum (2) is vertically arranged in the inner circulation zone (4), wherein a gap exists between the circulation drum (2) and the treatment drum (1), and a flow velocity difference between the circulation drum (2) and the gap is utilized during the water level rise process to cause the induced crystal seeds to pass through the circulation drum (2) and then flow back from the gap; The precipitation separation component (6) is arranged in the solid-liquid separation zone (12) and is used to separate the induced crystal seeds that are not refluxed.

2. The inorganic ion induced crystallization system according to claim 1, characterized in that: A seed mixing barrel (15) is provided between the seed conveying device (14) and the treatment barrel (1); a first inlet of the seed mixing barrel (15) is connected to an outlet of the seed conveying device (14); a second inlet of the seed mixing barrel (15) is used to introduce a portion of raw water; a first outlet of the seed mixing barrel (15) is connected to an inlet of a first dosing pump (16); and an outlet of the first dosing pump (16) is connected to a dosing port (33).

3. The inorganic ion induced crystallization system according to claim 1, characterized in that: The stirring assembly comprises: A stirring shaft (10) is vertically arranged in the crystallization reaction zone (3), wherein the lower end of the stirring shaft (10) passes through the bottom of the treatment cylinder (1) and is located below the treatment cylinder (1); A plurality of stirring blades (11) are evenly arranged on the stirring shaft (10); The first motor (9) is arranged at the lower part of the processing cylinder (1), and the output end of the first motor (9) is connected to the lower end of the stirring shaft (10).

4. The inorganic ion induced crystallization system according to claim 1, characterized in that: The sedimentation separation component (6) is a vertical vortex tube device or an inclined tube sedimentation device.

5. The inorganic ion induced crystallization system according to claim 1, characterized in that: A dosing port (34) is provided on the side of the treatment cylinder (1) between the crystallization reaction zone (3) and the internal circulation zone (4), and the dosing port (34) is connected to the outlet of the second dosing pump (19), and the inlet of the second dosing pump (19) is connected to the medicine storage barrel (20), and the medicine storage barrel (20) stores a softening agent. A medicine dispensing piece (5) is provided near the dosing port (34) in the treatment cylinder (1), and the inlet of the medicine dispensing piece (5) is connected to the dosing port (34). The medicine dispensing piece (5) is used to uniformly dispense the softening agent into the treatment cylinder (1).

6. The inorganic ion induced crystallization system according to claim 2, characterized in that: A water collecting trough (7) is provided on the upper portion of the treatment cylinder (1), and the water collecting trough (7) is communicated with the treatment cylinder (1). A reflux port (35) is provided on the side of the treatment cylinder (1) near the crystallization reaction zone (3), and the reflux port (35) is connected to the outlet of the water collecting trough (7).

7. The inorganic ion induced crystallization system according to claim 6, characterized in that: The outlet of the water collecting tank (7) is connected to the inlet of the cyclone separator (13), and the cyclone separator (13) is used for performing a primary separation of the induced crystal seeds in the soft water. The first outlet of the cyclone separator (13) is connected to the second inlet of the crystal seed mixing barrel (15). The second outlet of the cyclone separator (13) is connected to a separation component, and the separation component is used for performing a secondary separation of the induced crystal seeds in the soft water and separating the microcrystals in the soft water. The separation component is connected to a crystal seed activation component, and the crystal seed activation component is used for activating the microcrystals and induced crystal seeds separated by the separation component to obtain activated induced crystal seeds, and the activated induced crystal seeds are sent to the crystal seed mixing barrel (15).

8. The inorganic ion-induced crystallization system according to claim 7, characterized in that: The separation component comprises: A separation outer cylinder (25) is arranged vertically; A separation inner cylinder (26) is vertically arranged in the separation outer cylinder (25); the upper end of the separation inner cylinder (26) is a closed structure; the separation inner cylinder (26) is connected to the second outlet of the cyclone separator (13) via a water inlet pipe (30); and the water inlet pipe (30) passes through the separation outer cylinder (25); A first storage box (21) stores a seed crystal separation aid therein, wherein the outlet of the first storage box (21) is connected to a water inlet pipe (30) via a third dosing pump (22); An overflow weir (23) is provided on the upper portion of the separation outer cylinder (25) and is in communication with the separation outer cylinder (25), and a water outlet pipe (24) is provided on one side of the overflow weir (23); The discharge pipe (31) is provided at the lower portion of the separation outer cylinder (25), and one end of the discharge pipe is connected to the separation outer cylinder (25).

9. The inorganic ion induced crystallization system according to claim 8, characterized in that: The seed activation assembly comprises: A seed crystal activation box (29), the first inlet of which is connected to the other end of the discharge pipe (31), and the outlet of the seed crystal activation box (29) is connected to the third inlet of the seed crystal mixing barrel (15); The second storage box (27) stores a seed crystal activation auxiliary agent therein, and the outlet of the second storage box (27) is connected to the second inlet of the seed crystal activation box (29) via a fourth dosing pump (28).

10. The inorganic ion induced crystallization system according to claim 8, characterized in that: A scraper (17) is provided at the bottom of the separation outer cylinder (25), and a second motor (18) is provided at the lower portion of the separation outer cylinder (25). The output end of the second motor (18) passes through the lower portion of the separation outer cylinder (25) and is connected to the scraper (17).

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