Inorganic ion induced crystallization seed crystal self-circulation system and method thereof

Abstract

The invention belongs to the technical field of water treatment, and relates to an inorganic ion induced crystallization seed crystal self-circulation system and a method thereof, the inorganic ion induced crystallization seed crystal self-circulation system comprises an inorganic ion crystallizer, a microcrystal separation device, a seed crystal separation device and a seed crystal regeneration device. According to the invention, induced seed crystals after reaction can be divided into recycled seed crystals, regenerated seed crystals and collected seed crystals according to the particle size from small to large, the recycled seed crystals are fed into the inorganic ion crystallizer for recycling, and meanwhile, microcrystals and the regenerated seed crystals are received by the seed crystal regeneration device and treated, so that the yield of the microcrystals and the regenerated seed crystals is improved. Recovering the induced crystallization capability of the microcrystal and the regenerated seed crystal to obtain an induced seed crystal, feeding the induced seed crystal into an inorganic ion crystallizer for cyclic utilization, collecting the seed crystal, and dehydrating to realize resource utilization, so that the efficient and stable water treatment effect is obtained, the utilization efficiency of the induced seed crystal is improved, the cyclic utilization of the seed crystal is realized, and the cost is reduced. And further popularization and application of an induced crystallization water treatment technology in the field of complex water quality treatment are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment and relates to an inorganic ion-induced crystallization seed self-circulation system and a method thereof. Background Art

[0002] Inorganic ion pollution is widely present in water bodies, especially hardness ions represented by calcium and magnesium, fluoride ions, iron, manganese ions, etc. When the content of these ions in water is high, they will not only harm human health, but also easily cause scale deposition, reduced heat exchange efficiency and equipment corrosion. It is also a key factor restricting the long-term stable operation of industrial circulating water, boiler water and drinking water. At present, the removal of inorganic ions in water mainly relies on chemical precipitation, ion exchange, membrane treatment, electrochemical method and crystallization method. Among them, crystallization method has been widely used in the field of water treatment in recent years. This method adds induced crystal seeds and treatment agents to the water to induce the target ions in the water to produce crystals and attach to the surface of the crystal seeds to achieve the purpose of removal. Related engineering cases have shown that this method has a good treatment effect in water quality treatment involving hardness ions, fluoride ions, iron and manganese ions, sulfate ions and bicarbonate ions. Compared with other methods, it has the advantages of less chemical use, low sludge production, controllable by-products and low operating costs.

[0003] However, the existing induced crystallization water treatment devices still have shortcomings in terms of seed utilization efficiency, equipment structure design, crystallization performance sustainability and process adaptability. This makes it difficult for the existing induced crystallization water treatment devices to balance treatment efficiency and induced seed utilization efficiency when faced with actual engineering scenarios with complex components and changeable working conditions, restricting the further promotion and application of this technology in the field of complex water quality treatment. Summary of the Invention

[0004] The object of the present invention is to provide an inorganic ion induced crystallization seed self-circulation system and method thereof, which can improve the utilization efficiency of induced crystal seeds and realize the recycling of crystal seeds while achieving efficient and stable water treatment effects.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: An inorganic ion induced crystallization seed self-circulation system includes an inorganic ion crystallizer, a first inlet of the inorganic ion crystallizer is used to introduce raw water, a second inlet of the inorganic ion crystallizer is used to add induced crystal seeds, and further includes: The microcrystal separation device has an inlet connected to the first outlet of the inorganic ion crystallizer and is used for separating microcrystals in soft water.

[0006] The seed separation device has a first inlet connected to the second outlet of the inorganic ion crystallizer, the second inlet of the seed separation device is used to add a seed separation agent, the first outlet of the seed separation device is connected to the second inlet of the inorganic ion crystallizer, and the seed separation device is used to separate the induced seeds deposited at the bottom of the inorganic ion crystallizer after the reaction into recycled seeds, regenerated seeds and collected seeds according to particle size from small to large, and send the recycled seeds back into the inorganic ion crystallizer for reuse.

[0007] The seed regeneration device has a first inlet connected to the first outlet of the microcrystal separation device and the first outlet of the seed separation device respectively, the second inlet of the seed regeneration device is used for adding a seed recovery agent, the first outlet of the seed regeneration device is connected to the second inlet of the inorganic ion crystallizer, the seed regeneration device is used to receive microcrystals and regenerated seed crystals, process the microcrystals and regenerated seed crystals, restore the induced crystallization ability of the microcrystals and regenerated seed crystals to obtain induced seed crystals, and send the induced seed crystals into the inorganic ion crystallizer for recycling.

[0008] The present invention is also characterized in that: A microcrystal collection and polymerization device is arranged between the microcrystal separation device and the seed crystal regeneration device. The inlet of the microcrystal collection and polymerization device is connected to the second outlet of the microcrystal separation device. The microcrystal collection and polymerization device is used to collect and polymerize the microcrystals in the microcrystal separation device, and send the collected and polymerized microcrystals into the seed crystal regeneration device through the outlet.

[0009] The microcrystal collection and polymerization device is one of an inclined tube sedimentation device, an inclined plate sedimentation device and a vertical vortex tube sedimentation device.

[0010] The microcrystal separation device is a cyclone separation device.

[0011] The seed crystal separation device is a agglomeration and granulation fluidized bed.

[0012] The second outlet of the seed separation device is connected to a seed collection device, which is used to receive and store the collected seeds from the seed separation device.

[0013] The seed crystal regeneration device is a stirred reactor.

[0014] The second inlet of the seed separation device is connected to a separation agent dosing device, which is used to add seed separation agent into the seed separation device. The second inlet of the seed regeneration device is connected to a seed recovery agent dosing device, which is used to add seed recovery agent into the seed regeneration device.

[0015] An inorganic ion-induced crystallization seed self-circulation method comprises the following steps: The raw water is introduced into the inorganic ion crystallizer, and the induced crystal seeds are added to the inorganic ion crystallizer. The raw water and the induced crystal seeds are fully contacted and reacted to obtain soft water containing microcrystals. At the same time, the induced crystal seeds after the reaction are continuously deposited at the bottom of the inorganic ion crystallizer.

[0016] The soft water containing microcrystals enters the microcrystal separation device for separation to obtain soft water and microcrystals. The soft water is discharged and the microcrystals are collected and aggregated.

[0017] The induced crystal seeds after the reaction deposited at the bottom of the inorganic ion crystallizer are introduced into the seed separation device, and a seed separation agent is added to the seed separation device. Under the action of the seed separation agent, the seed separation device separates the induced crystal seeds after the reaction into recycled crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large, and sends the recycled crystal seeds to the inorganic ion crystallizer for reuse.

[0018] The regenerated crystal seeds and the collected and polymerized microcrystals are introduced into the crystal seed regeneration device, and a crystal seed recovery agent is added to the crystal seed regeneration device. The crystal seed regeneration device processes the regenerated crystal seeds and microcrystals under the action of the crystal seed recovery agent, recovers the inducing crystallization ability of the microcrystals and the regenerated crystal seeds to obtain induced crystal seeds, and the induced crystal seeds are sent to the inorganic ion crystallizer for recycling.

[0019] The inorganic ion-induced crystallization seed self-circulation system and method of the present invention have the following advantages: The present invention cooperates with an inorganic ion crystallizer, a microcrystal separation device, a seed separation device and a seed regeneration device. The seed separation device can separate the induced crystal seeds after the reaction into reuse crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large, and send the reuse crystal seeds into the inorganic ion crystallizer for reuse. At the same time, the seed regeneration device receives the microcrystals and regenerated crystal seeds, processes the microcrystals and regenerated crystal seeds, restores the induced crystallization ability of the microcrystals and regenerated crystal seeds to obtain induced crystal seeds, and sends the induced crystal seeds into the inorganic ion crystallizer for recycling. While obtaining efficient and stable water treatment effects, the utilization efficiency of the induced crystal seeds is improved and the recycling of the crystal seeds is realized, thereby taking into account both the treatment efficiency and the utilization efficiency of the induced crystal seeds, and ensuring that the induced crystallization water treatment technology can be further promoted and applied in the field of complex water quality treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Reference numerals: 1. Inorganic ion crystallizer, 2. Microcrystal separation device, 3. Microcrystal collection and polymerization device, 4. Crystal seed separation device, 5. Crystal seed regeneration device, 6. Separation agent dosing device, 7. Crystal seed recovery agent dosing device, 8. Crystal seed collection device. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1As shown, the present invention provides an inorganic ion induced crystallization seed self-circulation system, comprising an inorganic ion crystallizer 1, a microcrystal separation device 2, a seed separation device 4 and a seed regeneration device 5, wherein the first inlet of the inorganic ion crystallizer 1 is used to introduce raw water, the second inlet of the inorganic ion crystallizer 1 is used to add induced crystal seeds, the inorganic ion crystallizer 1 is used to utilize the induced crystal seeds to fully contact and react with the raw water to obtain soft water containing microcrystals, the inlet of the microcrystal separation device 2 is connected to the first outlet of the inorganic ion crystallizer 1, the microcrystal separation device 2 is used to separate the microcrystals in the soft water, and the first outlet of the microcrystal separation device 2 The second outlet of the microcrystal separation device 2 is used to discharge the separated microcrystals. The first inlet of the seed separation device 4 is connected to the second outlet of the inorganic ion crystallizer 1. The second inlet of the seed separation device 4 is used to add a seed separation agent. The first outlet of the seed separation device 4 is connected to the second inlet of the inorganic ion crystallizer 1. The seed separation device 4 is used to separate the induced crystal seeds deposited at the bottom of the inorganic ion crystallizer 1 into recycled crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large, and send the recycled crystal seeds to the inorganic ion crystallizer 1 for reuse. The seed regeneration device 5 The first inlet is connected to the first outlet of the microcrystal separation device 2 and the first outlet of the seed separation device 4 respectively, the second inlet of the seed regeneration device 5 is used to add a seed recovery agent, the first outlet of the seed regeneration device 5 is connected to the second inlet of the inorganic ion crystallizer 1, the seed regeneration device 5 is used to receive microcrystals and regenerated seeds, process the microcrystals and regenerated seeds, restore the inducing crystallization ability of the microcrystals and regenerated seeds to obtain induced crystal seeds, and send the induced crystal seeds to the inorganic ion crystallizer 1 for recycling. The present invention uses the seed separation device 4 to divide the induced crystal seeds after the reaction into reused crystal seeds, regenerated crystal seeds and induced crystal seeds according to the particle size from small to large. Crystal seeds and collected crystal seeds are sent back into the inorganic ion crystallizer 1 for reuse. At the same time, the microcrystals and regenerated crystal seeds are received by the crystal seed regeneration device 5, the microcrystals and regenerated crystal seeds are processed, the induced crystallization ability of the microcrystals and regenerated crystal seeds is restored to obtain induced crystal seeds, and the induced crystal seeds are sent into the inorganic ion crystallizer 1 for recycling. While obtaining efficient and stable water treatment effects, the utilization efficiency of the induced crystal seeds is improved and the recycling of the crystal seeds is realized, thereby taking into account both the treatment efficiency and the utilization efficiency of the induced crystal seeds, and ensuring that the induced crystallization water treatment technology can be further promoted and applied in the field of complex water quality treatment.

[0024] like Figure 1As shown, a microcrystal collecting and polymerization device 3 is arranged between the microcrystal separation device 2 and the seed regeneration device 5, the inlet of the microcrystal collecting and polymerization device 3 is connected to the outlet of the microcrystal separation device 2, the outlet of the microcrystal collecting and polymerization device 3 is connected to the first inlet of the seed regeneration device 5, the inlet of the microcrystal collecting and polymerization device 3 is connected to the second outlet of the microcrystal separation device 2, the microcrystal collecting and polymerization device 3 is used to collect and polymerize the microcrystals in the microcrystal separation device 2, and send the collected and polymerized microcrystals into the seed regeneration device 5 through the outlet, the microcrystal collecting and polymerization device 3 is one of the inclined tube sedimentation device, the inclined plate sedimentation device and the vertical vortex tube sedimentation device, which is convenient for collecting and polymerizing the microcrystals.

[0025] Among them, the microcrystal separation device 2 is preferably a cyclone separation device.

[0026] Among them, the seed separation device 4 is preferably a agglomeration granulation fluidized bed, which can be used to perform multi-stage separation treatment by connecting multiple fluidized beds in series according to the particle size of the induced seed used in the inorganic ion crystallizer 1, that is, performing multi-stage separation such as primary separation and secondary separation. The seed separation agent is PAM, that is, polyacrylamide. Different structural forms and seed separation agents are used for the agglomeration granulation fluidized bed according to the separation target. The seeds with smaller particle size in each level of fluidized bed, that is, the recycled seeds, are directly added to the inorganic ion crystallizer 1 for reuse, and the seeds with a particle size range between the recycled seeds and the collected seeds, that is, the regenerated seeds, enter the seed regeneration device 5.

[0027] like Figure 1 As shown, the second outlet of the seed separation device 4 is connected to the seed collection device 8, which is used to receive the collected seeds from the seed separation device 4 and store them. That is, the seeds with larger particle sizes enter the seed collection device 8 and are collected as product crystals. At the same time, the soft water that enters the seed separation device 4 along with the induced seeds after the reaction is discharged from the third outlet of the seed separation device 4.

[0028] Among them, the seed regeneration device 5 is preferably a stirred reactor, and the seed recovery agent uses an anionic surfactant. The regenerated seeds and microcrystals undergo surface roughness and charge property adjustment under the action of the seed recovery agent to restore the induced crystallization ability. The regenerated induced seeds enter the inorganic ion crystallizer 1 for recycling.

[0029] like Figure 1 As shown, the first outlet of the microcrystal separation device 2 is used to discharge soft water. At the same time, the first outlet of the microcrystal separation device 2 is connected to the third inlet of the seed regeneration device 5, which is used to send part of the soft water into the seed regeneration device 5 and treat the regenerated seeds and microcrystals in combination with the seed recovery agent.

[0030] like Figure 1As shown, the second inlet of the seed separation device 4 is connected to the separating agent dosing device 6, in which the seed separation agent is stored. The separating agent dosing device 6 is used to add the seed separation agent to the seed separation device 4. The second inlet of the seed regeneration device 5 is connected to the seed recovery agent dosing device 7, in which the seed recovery agent is stored. The seed recovery agent dosing device 7 is used to add the seed recovery agent to the seed regeneration device 5.

[0031] like Figure 1 As shown, the present invention also provides an inorganic ion-induced crystallization seed self-circulation method, comprising the following steps: Raw water is introduced into the inorganic ion crystallizer 1, and induction crystal seeds are added to the inorganic ion crystallizer 1. The raw water and the induction crystal seeds are fully contacted and reacted to obtain soft water containing microcrystals. At the same time, the induction crystal seeds after the reaction are continuously deposited at the bottom of the inorganic ion crystallizer 1.

[0032] The soft water containing microcrystals enters the microcrystal separation device 2 for separation to obtain soft water and microcrystals. The soft water is discharged and the microcrystals are collected and aggregated.

[0033] The induced crystal seeds after the reaction deposited at the bottom of the inorganic ion crystallizer 1 are introduced into the seed separation device 4, and a seed separation agent is added to the seed separation device 4. Under the action of the seed separation agent, the seed separation device 4 separates the induced crystal seeds after the reaction into recycled crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large, and sends the recycled crystal seeds to the inorganic ion crystallizer 1 for reuse.

[0034] The regenerated seed crystals and the collected and polymerized microcrystals are introduced into the seed crystal regeneration device 5, and a seed crystal recovery agent is added to the seed crystal regeneration device 5. The seed crystal regeneration device 5 processes the regenerated seed crystals and microcrystals under the action of the seed crystal recovery agent, recovers the inducing crystallization ability of the microcrystals and the regenerated seed crystals to obtain induced seed crystals, and the induced seed crystals are sent to the inorganic ion crystallizer 1 for recycling.

[0035] The microcrystals enter the microcrystal collecting and polymerizing device 3 for collection and polymerization.

[0036] The collected seed crystals obtained in the seed crystal separation device 4 are collected as product crystals, and the collected product crystals are dehydrated to obtain a crystal product for utilization.

[0037] Example 1 The raw water to be treated is of high hardness and this system is used for water softening treatment. 2+ The content is 40mmol / L, HCO3 - The content is 10mmol / L, SO4 2-The content is 66mmol / L, the induction crystal seeds are natural gypsum crystal particles, the crystal seed separator is PAM, and the crystal seed recovery agent is an anionic surfactant.

[0038] The specific processing steps are as follows: Raw water is introduced into the inorganic ion crystallizer 1, and natural gypsum crystal particles are added to the inorganic ion crystallizer 1. The raw water and the natural gypsum crystal particles are fully contacted and reacted to obtain soft water containing microcrystals. At the same time, the reacted natural gypsum crystal particles are continuously deposited at the bottom of the inorganic ion crystallizer 1 after a certain operating cycle.

[0039] The soft water containing microcrystals enters the microcrystal separation device 2 for separation to obtain soft water and microcrystals. The soft water is discharged and the microcrystals enter the microcrystal collection and polymerization device 3 for collection and polymerization.

[0040] The reacted induced seeds deposited at the bottom of the inorganic ion crystallizer 1 are introduced into the seed separation device 4, and PAM is added to the seed separation device 4. The seed separation device 4 separates the reacted induced seeds under the action of PAM, and divides the reacted induced seeds into recycled seeds, regenerated seeds and collected seeds according to their particle size from small to large, and the recycled seeds are sent to the inorganic ion crystallizer 1 for reuse.

[0041] The regenerated seed crystals and the collected and polymerized microcrystals are introduced into the seed crystal regeneration device 5, and an anionic surfactant is added to the seed crystal regeneration device 5. The seed crystal regeneration device 5 processes the regenerated seed crystals and microcrystals under the action of the anionic surfactant to restore the inducing crystallization ability of the microcrystals and the regenerated seed crystals to obtain induced seed crystals, and the induced seed crystals are sent to the inorganic ion crystallizer 1 for recycling.

[0042] The collected seeds obtained in the seed separation device 4 enter the seed collection device 8 to be collected as product crystals. The crystals in the seed collection device 8 are CaSO4·2H2O with a purity of ≥99%. At the same time, the collected product crystals are dehydrated to obtain gypsum products for resource utilization.

[0043] The inorganic ion-induced crystallization seed self-circulation system and method of the present invention have the following advantages: First, the present invention performs graded separation, collection and recovery processing through a seed separation device, thereby promoting the regeneration and utilization of induced seed crystals and realizing the self-circulation of induced seed crystals within the system, which has good environmental and economic benefits.

[0044] Second, the present invention can effectively improve the problem of high effluent turbidity caused by high ion content in raw water, large fluctuations in influent water quality, and high dosage of crystal seeds and softening agents. At the same time, it can effectively improve the problem of crystal seed overflow that is common in induced crystallization water treatment equipment and reduce the dissipation of induced crystal seeds.

[0045] Third, the present invention uses a seed recovery agent to treat the seed crystal, which can effectively reduce the surface roughness of the seed crystal, improve the charge distribution state of the seed crystal surface, and realize the recovery of the seed crystal induced crystallization performance.

[0046] 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 seed self-circulation system, comprising an inorganic ion crystallizer (1), wherein a first inlet of the inorganic ion crystallizer (1) is used to introduce raw water, and a second inlet of the inorganic ion crystallizer (1) is used to add induced crystal seeds, characterized in that: Also includes: A microcrystal separation device (2), the inlet of which is connected to the first outlet of the inorganic ion crystallizer (1), and is used to separate microcrystals in soft water; A seed separation device (4), wherein the first inlet is connected to the second outlet of the inorganic ion crystallizer (1), the second inlet of the seed separation device (4) is used for adding a seed separation agent, the first outlet of the seed separation device (4) is connected to the second inlet of the inorganic ion crystallizer (1), and the seed separation device (4) is used to separate the induced seed crystals deposited at the bottom of the inorganic ion crystallizer (1) after the reaction into recycled seed crystals, regenerated seed crystals and collected seed crystals according to the particle size from small to large, and to re-send the recycled seed crystals into the inorganic ion crystallizer (1) for recycling; The seed crystal regeneration device (5) has a first inlet connected to the first outlet of the microcrystal separation device (2) and the first outlet of the seed crystal separation device (4), respectively; the second inlet of the seed crystal regeneration device (5) is used for adding a seed crystal recovery agent; the first outlet of the seed crystal regeneration device (5) is connected to the second inlet of the inorganic ion crystallizer (1); the seed crystal regeneration device (5) is used to receive microcrystals and regenerated seed crystals, process the microcrystals and regenerated seed crystals, restore the inducing crystallization ability of the microcrystals and regenerated seed crystals to obtain induced seed crystals, and send the induced seed crystals into the inorganic ion crystallizer (1) for recycling.

2. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that: A microcrystal collecting and polymerizing device (3) is provided between the microcrystal separation device (2) and the seed crystal regeneration device (5). The inlet of the microcrystal collecting and polymerizing device (3) is connected to the second outlet of the microcrystal separation device (2). The microcrystal collecting and polymerizing device (3) is used to collect and polymerize the microcrystals in the microcrystal separation device (2), and to send the collected and polymerized microcrystals into the seed crystal regeneration device (5) through the outlet.

3. The inorganic ion-induced crystallization seed self-circulation system according to claim 2, characterized in that: The microcrystal collection and polymerization device (3) is one of an inclined tube sedimentation device, an inclined plate sedimentation device and a vertical vortex tube sedimentation device.

4. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that: The microcrystal separation device (2) is a cyclone separation device.

5. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that: The seed crystal separation device (4) is an agglomeration and granulation fluidized bed.

6. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that: The second outlet of the seed separation device (4) is connected to a seed collection device (8), and the seed collection device (8) is used to receive and store the collected seeds from the seed separation device (4).

7. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that: The seed crystal regeneration device (5) is a stirred reactor.

8. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that: The second inlet of the seed separation device (4) is connected to a separating agent dosing device (6), and the separating agent dosing device (6) is used to add a seed separation agent into the seed separation device (4). The second inlet of the seed regeneration device (5) is connected to a seed recovery agent dosing device (7), and the seed recovery agent dosing device (7) is used to add a seed recovery agent into the seed regeneration device (5).

9. An inorganic ion-induced crystallization seed self-circulation method, characterized in that: The system according to any one of claims 1 to 8 comprises the following steps: Raw water is introduced into the inorganic ion crystallizer (1), and induction crystal seeds are added to the inorganic ion crystallizer (1). The raw water and the induction crystal seeds are fully contacted and reacted to obtain soft water containing microcrystals. At the same time, the induction crystal seeds after the reaction are continuously deposited at the bottom of the inorganic ion crystallizer (1); The soft water containing microcrystals enters the microcrystal separation device (2) for separation to obtain soft water and microcrystals, the soft water is discharged, and the microcrystals are collected and aggregated; The induced crystal seeds deposited at the bottom of the inorganic ion crystallizer (1) after the reaction are introduced into the crystal seed separation device (4), and a crystal seed separation agent is added to the crystal seed separation device (4). Under the action of the crystal seed separation agent, the crystal seed separation device (4) separates the induced crystal seeds after the reaction into recycled crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large, and the recycled crystal seeds are sent to the inorganic ion crystallizer (1) for recycling; The regenerated seed crystals and the collected and polymerized microcrystals are introduced into the seed crystal regeneration device (5), and a seed crystal recovery agent is added to the seed crystal regeneration device (5). The seed crystal regeneration device (5) processes the regenerated seed crystals and the microcrystals under the action of the seed crystal recovery agent, recovers the inducing crystallization ability of the microcrystals and the regenerated seed crystals to obtain induced seed crystals, and the induced seed crystals are sent to the inorganic ion crystallizer (1) for recycling.

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