Inorganic ion-induced crystallization system

Abstract

The present application belongs to the technical field of water treatment, and relates to an inorganic ion induced crystallization system, comprising: a treatment cylinder, a crystal seed delivery device, a stirring assembly, a circulating cylinder; a sedimentation separation assembly arranged in a solid-liquid separation zone and used for separating the induced crystal seeds not backflowed. The present application takes the induced crystallization of ions in water as a removal mechanism, reduces the reaction energy barrier of the ions in water through the induced crystal seeds, promotes the reaction of hardness ions, alkalinity ions and sulfate ions to generate crystalline substances, and removes the crystalline substances attached to the surface of the induced crystal seeds from the water, thereby avoiding the generation of waste salt, sludge and other pollutants. Meanwhile, through the cooperation of the circulating cylinder, the sedimentation separation assembly and the stirring assembly, the induced crystal seed backflow is formed in the treatment cylinder, and the stirring assembly is used for stirring, so that the mixing reaction time of the induced crystal seeds and raw water is increased, the crystallization efficiency is improved, and the softening and desalination efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology and relates to an inorganic ion-induced crystallization system. Background Technology

[0002] The problem of high-hardness water in my country exhibits significant regional distribution characteristics and systemic hazards. Geographically, high-hardness water (total hardness > 300 mg / L) shows a clear "high in the north, low in the south" pattern. In North China, groundwater hardness generally reaches 300 mg / L to 600 mg / L, with deep confined aquifers even exceeding 800 mg / L. In the arid Northwest region, due to strong evaporation and concentration, the hardness of surface water and shallow groundwater is mostly between 400 mg / L and 1000 mg / L, and in some closed-flow areas, it can reach over 2000 mg / L. This distribution pattern is closely related to regional geological structure, climate conditions, and human activities. The hazards caused by high-hardness water have multi-dimensional impacts. In the public sector, long-term consumption of high-hardness water significantly increases the risk of urinary system diseases. In industrial production, scaling problems lead to a 15% to 30% decrease in equipment heat exchange efficiency, resulting in annual economic losses exceeding tens of billions of yuan. In agricultural irrigation, high-hardness water causes soil compaction and salinization, affecting crop yields.

[0003] Currently, mainstream water treatment technologies for high-hardness water include ion exchange and chemical precipitation. While these technologies can reduce water hardness to some extent, they all suffer from low treatment efficiency and high pollutant production. Ion exchange, although relatively stable, has a short resin regeneration cycle, limiting overall treatment efficiency and generating large amounts of waste salt during regeneration, which becomes a major source of pollutants. Chemical precipitation, while lower in cost, has a slow reaction rate, requiring more time to treat the same volume of water, resulting in lower efficiency. It also generates 5 to 8 tons of sludge per 10,000 tons of water, which, as a pollutant, puts significant pressure on subsequent disposal. Given the shortcomings of existing technologies in 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 purpose of this invention is to provide an inorganic ion-induced crystallization system that can improve softening and desalination efficiency while avoiding the generation of pollutants.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows: An inorganic ion-induced crystallization system, comprising: The treatment cylinder is set vertically. The inside 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. The treatment cylinder has an inlet and a dosing port on both sides of the crystallization reaction zone. The inlet is used to introduce raw water.

[0006] The seed crystal delivery device, connected to the dosing port, is used to add induced seed crystals into the crystallization reaction zone. Through the induced crystal crystals, the raw water is desalinated to obtain soft water.

[0007] The stirring assembly, located within the crystallization reaction zone, is used to stir the induced seed crystals and the raw water.

[0008] The circulation cylinder is vertically installed in the inner circulation zone. There is a gap between the circulation cylinder and the treatment cylinder. The flow velocity difference between the circulation cylinder and the gap is used to induce seed crystals to flow back from the gap after passing through the circulation cylinder during the water level rise.

[0009] The precipitation separation component, located within the solid-liquid separation zone, is used to separate the induced crystals that have not been refluxed.

[0010] The invention is further characterized by: A seed mixing tank is provided between the seed conveying device and the processing cylinder. The first inlet of the seed mixing tank is connected to the outlet of the seed conveying device. The second inlet of the seed mixing tank is used to introduce some raw water. The first outlet of the seed mixing tank is connected to the inlet of the first dosing pump. The outlet of the first dosing pump is connected to the dosing port.

[0011] The stirring component includes: The stirring shaft is vertically positioned within the crystallization reaction zone, with its lower end passing through the bottom of the processing cylinder and located below the cylinder.

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

[0013] The first motor is located at the bottom of the processing cylinder, and its output end is connected to the bottom end of the stirring shaft.

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

[0015] The treatment cylinder has a dosing port located on its side between the crystallization reaction zone and the internal circulation zone. The dosing port is connected to the outlet of the second dosing pump, and the inlet of the second dosing pump is connected to a storage tank containing softening agent. A dosing distribution device is located inside the treatment cylinder near the dosing port, with its inlet connected to the dosing port. The dosing distribution device is used to evenly add the softening agent into the treatment cylinder.

[0016] The upper part of the treatment cylinder is equipped with a water collection tank, which is connected to the treatment cylinder. A reflux port is set on the side of the treatment cylinder near the crystallization reaction zone, and the reflux port is connected to the outlet of the water collection tank.

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

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

[0019] The inner separator is vertically installed inside the outer separator. The upper end of the inner separator is a closed structure. The inner separator is connected to the second outlet of the cyclone separator through a water inlet pipe, which passes through the outer separator.

[0020] The first storage tank contains seed crystal separation aids, and its outlet and inlet pipe are connected via a third dosing pump.

[0021] An overflow weir is located on the upper part of the outer separator cylinder and is connected to the outer separator cylinder. A water outlet pipe is installed on one side of the overflow weir.

[0022] The discharge pipe is located at the bottom of the outer separator cylinder, and one end is connected to the outer separator cylinder.

[0023] The seed activation component includes: The seed activation box has its first inlet connected to the other end of the discharge pipe, and its outlet connected to the third inlet of the seed mixing tank.

[0024] The second storage tank contains seed crystal activating agent, and its outlet is connected to the second inlet of the seed crystal activating tank via a fourth dosing pump.

[0025] The outer cylinder is equipped with a scraper at the bottom and a second motor at the bottom. The output end of the second motor passes through the bottom of the outer cylinder and is connected to the scraper.

[0026] The inorganic ion-induced crystallization system of the present invention has the following advantages: This invention utilizes the induced crystallization of ions in water as a removal mechanism. By inducing crystal seeds, the reaction energy barrier of ions in water is lowered, promoting the reaction of hardness ions, alkalinity ions, sulfate ions, and other ions to form crystals. The crystals adhere to the surface of the induced crystal seeds and are removed from the water, avoiding the generation of pollutants such as waste salt and sludge. At the same time, the combination of the circulation tank, sedimentation separation component, and stirring component creates a reflux of induced crystal seeds inside the treatment tank, and the stirring component further increases the mixing and reaction time between the induced crystal seeds and the raw water, improving the crystallization efficiency and thus improving the softening and desalination efficiency. Attached Figure Description

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

[0028] Figure 2 This is a schematic diagram of the processing cylinder in this invention.

[0029] Figure label: 1. Processing cylinder, 2. Circulation cylinder, 3. Crystallization reaction zone, 4. Inner circulation zone, 5. Chemical distribution unit, 6. Sedimentation separation component, 7. Water collection tank, 8. Slag discharge port, 9. First motor, 10. Stirring shaft, 11. Stirring blade, 12. Solid-liquid separation zone, 13. Hydrocyclone separator, 14. Seed crystal conveying device, 15. Seed crystal mixing tank, 16. First dosing pump, 17. Sludge scraper, 18. Second motor, 19. Second dosing pump, 20. Chemical storage tank, 21. First storage tank, 22. Third dosing pump, 23. Overflow weir, 24. Water outlet pipe, 25. Outer separation cylinder, 26. Inner separation cylinder, 27. Second storage tank, 28. Fourth dosing pump, 29. Seed crystal activation tank, 30. Water inlet pipe, 31. Discharge pipe, 32. Water inlet, 33. Dosing port, 34. Chemical dosing port, 35. Return port. Detailed Implementation

[0030] The technical solutions of the present invention will now be described clearly and in detail with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments of the present invention, "multiple" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] like Figure 1 , Figure 2As shown, this invention provides an inorganic ion-induced crystallization system, including a processing cylinder 1, a seed crystal conveying device 14, a stirring assembly, a circulation cylinder 2, and a precipitation separation assembly 6. The processing cylinder 1 is vertically arranged, with an open upper end and a closed lower end. The interior of the processing cylinder 1 is divided into a crystallization reaction zone 3, an inner circulation zone 4, and a solid-liquid separation zone 12 from bottom to top. Water inlets 32 and dosing ports 33 are respectively located on both sides of the processing cylinder 1 at positions within the crystallization reaction zone 3. Both water inlets 32 and dosing ports 33 are close to the lower part of the processing cylinder 1. Water inlet 32 ​​is used to introduce raw water. Seed crystal delivery device 14 is connected to inlet 33. Seed crystal delivery device 14 is used to add induced crystal seeds into crystallization reaction zone 3. Desalination of the raw water is achieved through the induced crystallization effect of the induced crystal seeds. A stirring assembly is installed in crystallization reaction zone 3 to stir the induced crystal seeds and raw water, promoting the mixing reaction and optimizing the mixing effect. Circulation cylinder 2 is vertically installed in inner circulation zone 4. Both ends of circulation cylinder 2 are open structures. Circulation cylinder 2 and... There is a gap between the treatment cylinder 1 and the circulation cylinder 2. During the rise of the water level, the flow velocity difference between the circulation cylinder 2 and the gap causes the induced crystals to flow back from the gap after passing through the circulation cylinder 2. That is, the flow velocity in the circulation cylinder 2 is greater than the flow velocity in the gap. The sedimentation separation component 6 is set in the solid-liquid separation zone 12. The sedimentation separation component 6 is used to separate the induced crystals that have not flowed back. Under the action of gravity, the induced crystals flow back to the crystallization reaction zone 3 and continue to participate in the desalination treatment of the raw water to obtain soft water. This invention uses the induced crystallization of ions in water as the removal mechanism. The induced crystals reduce the reaction energy barrier of ions in water, promote the reaction of hardness ions, alkalinity ions, sulfate ions and other ions to form crystals. The crystals are attached to the surface of the induced crystals and removed from the water, avoiding the generation of pollutants such as waste salt and sludge. At the same time, through the cooperation of the circulation cylinder 2, the sedimentation separation component 6 and the stirring component, the induced crystals are refluxed inside the treatment cylinder 1. The stirring component increases the mixing reaction time between the induced crystals 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 processing cylinder 1 has a three-section variable diameter structure, which improves the internal flow field distribution and optimizes the contact between the induced crystal seed and the raw water, thereby improving the crystallization efficiency.

[0033] like Figure 1 , Figure 2As shown, a seed mixing tank 15 is provided between the seed conveying device 14 and the processing cylinder 1. The first inlet of the seed mixing tank 15 is connected to the outlet of the seed conveying device 14. The second inlet of the seed mixing tank 15 is used to introduce some raw water. The first outlet of the seed mixing tank 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. By mixing the induced seed crystals with the raw water first and then sending them into the crystallization reaction zone 3, the mixing reaction time of the induced seed crystals and the raw water is further increased, and the crystallization efficiency is improved.

[0034] like Figure 1 , Figure 2 As shown, the lower part of the treatment cylinder 1 is provided with a slag discharge port 8, and a valve is provided on the slag discharge port 8 to facilitate the discharge of waste residue 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, multiple 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 processing cylinder 1 and is located below the processing cylinder 1. The multiple stirring blades 11 are evenly arranged on the stirring shaft 10. The first motor 9 is located 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.

[0036] Among them, 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 located on the side of the treatment cylinder 1 between the crystallization reaction zone 3 and the internal 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 a storage tank 20, which stores softening agent. A dosing distribution component 5 is located inside the treatment cylinder 1 near the dosing port 34. The inlet of the dosing distribution component 5 is connected to the dosing port 34. The dosing distribution component 5 is used to evenly add the softening agent into the treatment cylinder 1. By adding softening agent to the treatment cylinder 1, it is easy to adjust the pH value of the water, provide a suitable chemical environment for crystallization, and ensure the stable progress of the softening and desalination process.

[0038] like Figure 1 , Figure 2 As shown, a water collection tank 7 is provided on the upper part of the treatment cylinder 1. The water collection tank 7 is connected to the treatment cylinder 1. A reflux port 35 is provided on the side of the treatment cylinder 1 near the crystallization reaction zone 3. The reflux port 35 is connected to the outlet of the water collection tank 7. According to the water quality, some soft water can be discharged into the treatment cylinder 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 hydrocyclone separator 13. The hydrocyclone separator 13 is used to perform the initial separation of induced crystals in the soft water. The first outlet of the hydrocyclone separator 13 is connected to the second inlet of the seed mixing tank 15. The collected induced crystals are discharged into the seed mixing tank 15 for reuse. The second outlet of the hydrocyclone separator 13 is connected to a separation component. The separation component is used to perform secondary separation of induced crystals in the soft water and separate microcrystals in the soft water. The particle size of the induced crystals separated in the secondary separation is smaller than that of the induced crystals separated in the primary separation. The separation component is connected to a seed activation component. The seed activation component is used to activate the microcrystals and induced crystals separated by the separation component to obtain activated induced crystals, and then send the activated induced crystals into the seed mixing tank 15.

[0040] like Figure 1 As shown, the separation assembly includes an outer separation cylinder 25, an inner separation cylinder 26, a first storage tank 21, an overflow weir 23, and a discharge pipe 31. The outer separation cylinder 25 is vertically arranged, with an open upper end and a closed lower end. The inner separation cylinder 26 is vertically arranged inside the outer separation cylinder 25, with a closed upper end. The inner separation cylinder 26 is connected to the second outlet of the cyclone separator 13 via a water inlet pipe 30, which passes through the outer separation cylinder 25. By sending soft water into the inner separation cylinder 26, the soft water first flows downwards and then upwards between the outer separation cylinder 25 and the inner separation cylinder 26. Under the action of gravity, the induced seed crystals after the reaction settle. Seed separation agent is deposited at the bottom of the outer separator 25. The first storage tank 21 stores seed separation agent. The outlet of the first storage tank 21 is connected to the inlet pipe 30 through the third dosing pump 22. The seed separation agent promotes the separation of induced seed crystals from the soft water after the reaction. The overflow weir 23 is set at the top of the outer separator 25 and is connected to the outer separator 25. A water outlet pipe 24 is set on one side of the overflow weir 23 to discharge the soft water after separation. The discharge pipe 31 is set at the bottom of the outer separator 25 and one end of the discharge pipe 31 is connected to the outer separator 25. The discharge pipe 31 facilitates the discharge of induced seed crystals 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 tank 15. 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 seed after the reaction and then send it back to the seed mixing tank 15 for recycling, which reduces the consumption of induced seed and thus reduces costs.

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

[0043] Example 1 The raw water to be treated was selected as the reverse osmosis concentrate generated during the treatment of industrial wastewater. The raw water contained Ca... 2+ The content is 40 mmol / L, SO4 2- The concentration is 66 mmol / L, which is typical for water with high permanent hardness. No softening agents are added when softening and desalinating this type of water.

[0044] Start the first motor 9. The first motor 9 drives multiple stirring blades 11 to rotate through the stirring shaft 10. The stirring blades 11 are selected as three-blade propulsion type and are evenly distributed according to the height of the crystallization reaction zone 3.

[0045] The seed crystals are introduced into the seed mixing tank 15 through the seed crystal conveying device 14, mixed with the raw water, and then introduced into the crystallization reaction zone 3 through the addition port 33. The seed crystals are natural gypsum crystal particles.

[0046] The induced crystal seeds and raw water are fully mixed in the crystallization reaction zone 3. When the water flows up to the inner circulation zone 4, the flow velocity in the circulation cylinder 2 is greater than the gap flow velocity during the water level rise. This allows the unreacted induced crystal seeds to flow back from the gap after passing through the circulation cylinder 2. 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 sedimentation separation component 6. The sedimentation separation component 6 is a vertical vortex tube device.

[0047] After separation, the soft water overflows into the collection tank 7 and is then discharged. At this point, the Ca in the soft water... 2+ Content ≤20mmol / L, SO4 2- With a content ≤46mmol / L, a portion of the effluent can be sent to the crystallization reaction zone 3 through the return port 35 for reuse, depending on the water quality. The soft water enters the hydrocyclone separator 13 for further turbidity removal. The collected suspended solids are discharged into the seed crystal mixing tank 15 for reuse. The soft water treated by the hydrocyclone separator 13 enters the separation inner cylinder 26 through the inlet pipe 30. At the same time, the seed crystal separation aid in the first storage tank 21 is sent to the inlet pipe 30 through the third dosing pump 22 and mixed evenly with the soft water before entering the separation inner cylinder 26 together. The effluent after deep separation is discharged through the outlet pipe 24 and enters the subsequent treatment unit. At this time, the turbidity in the water is ≤10NTU.

[0048] As the running time increases, the induced crystals after the reaction are deposited at the bottom of the outer separator 25 and discharged into the seed activation tank 29 through the discharge pipe 31. The seed activation aid in the second storage tank 27 is transported into the seed activation tank 29 through the fourth dosing pump 28 to activate the induced crystals after the reaction, so that they can be restored to activity and then sent back to the seed mixing tank 15 for recycling.

[0049] After a certain period of continuous operation, some of the larger-sized inducing crystals are discharged and the corresponding amount of original inducing crystals are replenished to maintain a continuous and stable operating effect.

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

[0051] Example 2 The raw water to be treated was selected as industrial circulating wastewater, and the Ca in the raw water was... 2+ The concentration was 23.2 mmol / L, CO3. 2- The content was 1.08 mmol / L, HCO3 - The content was 32.3 mmol / L, SO4 2- The content is 0.3 mmol / L, which is typical for water with high temporary hardness. NaOH is selected as the softening agent and is added into the treatment cylinder 1 through the dosing port 34. Anchor-type agitator blades 11 are selected and are only installed at the bottom of the treatment cylinder 1 and run at low speed.

[0052] The seed crystals are introduced into the seed mixing tank 15 through the seed crystal conveying device 14, mixed with the raw water, and then introduced into the crystallization reaction zone 3 through the addition port 33. The seed crystals are natural garnet crystal particles.

[0053] The induced crystal seeds and raw water are fully contacted and mixed in the crystallization reaction zone 3. When the water flows up to the inner circulation zone 4, the flow velocity in the circulation cylinder 2 is greater than the gap flow velocity during the water level rise. This allows the unreacted induced crystal seeds to flow back from the gap after passing through the circulation cylinder 2. 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 is a slanted tube sedimentation device.

[0054] After separation, the soft water overflows into the collection tank 7 and is then discharged. At this point, the Ca in the soft water... 2+With a content ≤3mmol / L, the soft water enters the hydrocyclone separator 13 for further turbidity removal. The collected suspended solids are discharged into the seed crystal mixing tank 15 for reuse. The soft water treated by the hydrocyclone separator 13 enters the separation inner cylinder 26 through the inlet pipe 30. At the same time, the seed crystal separation aid in the first storage tank 21 is sent into the inlet pipe 30 through the third dosing pump 22 and mixed evenly with the soft water before entering the separation inner cylinder 26 together. The effluent after deep separation is discharged through the outlet pipe 24 and enters the subsequent treatment unit.

[0055] As the running time increases, the induced crystals after the reaction are deposited at the bottom of the outer separator 25 and discharged into the seed activation tank 29 through the discharge pipe 31. The seed activation aid in the second storage tank 27 is transported into the seed activation tank 29 through the fourth dosing pump 28 to activate the induced crystals after the reaction, so that they can be restored to activity and then sent back to the seed mixing tank 15 for recycling.

[0056] Meanwhile, as the operating time increases, the induced crystal seeds inside the treatment cylinder 1 continue to grow and are eventually discharged periodically through the slag discharge port 8. The corresponding amount of original induced crystal seeds is then replenished to maintain a continuous and stable operating effect.

[0057] As a preferred embodiment, the induced seed crystals discharged after the reaction are smooth and dense calcium carbonate crystal particles. After discharge, no dehydration treatment is required. After natural air drying, they can be used as calcium carbonate products for resource utilization.

[0058] The inorganic ion-induced crystallization system of the present invention has the following other advantages: First, this invention performs multi-stage recycling of the induced crystal seeds used in the water treatment process and activates and reuses them and collects them for resource utilization based on their condition, thereby improving the efficiency of crystal seed utilization and further avoiding the generation of pollutants such as waste salt and sludge.

[0059] Secondly, compared with traditional ion exchange and chemical precipitation methods, this invention has the advantages of high processing rate, small footprint, low operating cost and no waste liquid generated. The crystals produced in water treatment have the characteristics of dense surface structure, easy dehydration and single composition. They can be recycled and utilized, achieving true "zero discharge" treatment.

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

[0061] Fourth, this 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 full recovery and activation of the induced crystal seeds are achieved, effectively solving the problems of low seed utilization, large seed consumption, and decreased seed-induced crystallization performance in existing similar technologies. At the same time, it optimizes the effluent quality of the induced crystallization system and significantly improves the system treatment effect.

[0062] Fifth, the present invention allows for flexible selection of process paths based on the raw water quality, and the addition of softening agents and selection of different types of softening agents can be based on the distribution of hardness ions and anions in the raw water. In addition, the effluent reflux ratio can be determined based on the effluent quality, which effectively improves the adaptability of the device to raw water of different qualities. It has achieved significant application results in the softening and desalination treatment of groundwater, urban sewage treatment plant wastewater, mine water and treated wastewater, thermal power plant wastewater, etc.

[0063] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. An inorganic ion-induced crystallization system, characterized in that, include: The treatment cylinder (1) is set vertically. 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 treatment cylinder (1) is provided with an inlet (32) and a dosing port (33) on both sides of the crystallization reaction zone (3). The inlet (32) is used to introduce raw water. The seed delivery device (14) is connected to the injection port (33) and is used to add induced seed crystals into the crystallization reaction zone (3). The desalination of the raw water is achieved by the induced crystal crystals to obtain soft water. The stirring assembly is set in the crystallization reaction zone (3) and is used to stir the induced seed crystals and the raw water; The circulation cylinder (2) is vertically set in the inner circulation zone (4). There is a gap between the circulation cylinder (2) and the treatment cylinder (1). The flow rate difference between the circulation cylinder (2) and the gap is used to induce the seed crystals to flow back from the gap after passing through the circulation cylinder (2) during the water level rise. A precipitation separation component (6) is set in the solid-liquid separation zone (12) to separate the induced crystals that have not been refluxed; A seed mixing tank (15) is provided between the seed conveying device (14) and the processing cylinder (1). The first inlet of the seed mixing tank (15) is connected to the outlet of the seed conveying device (14). The second inlet of the seed mixing tank (15) is used to introduce some raw water. The first outlet of the seed mixing tank (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). The upper part of the processing cylinder (1) is provided with a water collection tank (7), which is connected to the processing cylinder (1). A reflux port (35) is provided on the side of the processing cylinder (1) near the crystallization reaction zone (3), and the reflux port (35) is connected to the outlet of the water collection tank (7). The outlet of the water collection tank (7) is connected to the inlet of a cyclone separator (13). The cyclone separator (13) is used to perform initial separation of induced crystals in soft water. The first outlet of the cyclone separator (13) is connected to the second inlet of the seed mixing tank (15). The second outlet of the cyclone separator (13) is connected to a separation component. The separation component is used to perform secondary separation of induced crystals in soft water and separate microcrystals in soft water. The separation component is connected to a seed activation component. The seed activation component is used to activate the microcrystals and induced crystals separated by the separation component to obtain activated induced crystals, and send the activated induced crystals into the seed mixing tank (15). The separation component includes: Separate the outer cylinder (25) and set it vertically; The inner separator (26) is vertically installed inside the outer separator (25). The upper end of the inner separator (26) is a closed structure. The inner separator (26) is connected to the second outlet of the cyclone separator (13) through a water inlet pipe (30). The water inlet pipe (30) passes through the outer separator (25). The first storage tank (21) stores seed separation aid inside. The outlet of the first storage tank (21) is connected to the water inlet pipe (30) through the third dosing pump (22). An overflow weir (23) is set on the upper part of the separation outer cylinder (25) and is connected to the separation outer cylinder (25). A water outlet pipe (24) is provided on one side of the overflow weir (23). The discharge pipe (31) is located at the lower part of the outer separator (25), and one end is connected to the outer separator (25); The seed activation component includes: The seed activation box (29) has its first inlet connected to the other end of the discharge pipe (31), and its outlet is connected to the third inlet of the seed mixing tank (15). The second storage tank (27) contains seed activation aids. The outlet of the second storage tank (27) is connected to the second inlet of the seed activation tank (29) via the fourth dosing pump (28). The stirring assembly includes: The stirring shaft (10) is vertically set in the crystallization reaction zone (3). The lower end of the stirring shaft (10) passes through the bottom of the processing cylinder (1) and is located below the processing cylinder (1). Multiple stirring blades (11) are evenly arranged on the stirring shaft (10); The first motor (9) is located 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). A dosing port (34) is provided on the side of the processing cylinder (1) between the crystallization reaction zone (3) and the internal circulation zone (4). The dosing port (34) is connected to the outlet of the second dosing pump (19). The inlet of the second dosing pump (19) is connected to a storage tank (20). The storage tank (20) stores softening agent. A dosing device (5) is provided in the processing cylinder (1) near the dosing port (34). The inlet of the dosing device (5) is connected to the dosing port (34). The dosing device (5) is used to evenly inject the softening agent into the processing cylinder (1). A scraper (17) is provided at the bottom of the outer separator (25), and a second motor (18) is provided at the bottom of the outer separator (25). The output end of the second motor (18) passes through the bottom of the outer separator (25) and is connected to the scraper (17).

2. 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.

Images