CN211497055U - Fluidized bed crystallization separator for defluorination of fluorine-containing wastewater - Google Patents
Fluidized bed crystallization separator for defluorination of fluorine-containing wastewater Download PDFInfo
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- CN211497055U CN211497055U CN201921609990.3U CN201921609990U CN211497055U CN 211497055 U CN211497055 U CN 211497055U CN 201921609990 U CN201921609990 U CN 201921609990U CN 211497055 U CN211497055 U CN 211497055U
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Abstract
The utility model provides a fluidized bed crystallization separator for defluorination, include: the device comprises a cylinder body, a guide cylinder, a screening device and a return pipe, wherein a water distribution area, a medicine distribution area, a granulation area and a clear water area are sequentially arranged in the cylinder body from bottom to top; the screening device is arranged in the barrel body and between the water distribution area and the medicine distribution area, and comprises a screen and a storage device arranged below the screen; one end of the backflow pipe is connected with the seed crystal feeding port, and the other end of the backflow pipe is connected with the storage device and used for enabling the screened particles with smaller sizes to flow back to the granulation area for recycling.
Description
Technical Field
The utility model relates to a fluoride waste water is fluidized bed crystal separator for defluorination belongs to water treatment technical field.
Background
Fluorine is one of the essential trace elements for human life. Proper amount of fluorine can strengthen bones and teeth and reduce the incidence rate of dental caries. However, if drinking water with fluorine mass concentration higher than 1mg/L for a long time, dental fluorosis will be caused; long-term drinking of water with fluorine mass concentration of 3-6 mg/L can cause fluorosis. Recent data report that the long-term intake of excessive fluoride also causes carcinogenic and teratogenic reactions. In recent years, environmental water has been subject to fluorine pollution. In one aspect, over 150 fluorine-containing minerals, including the common minerals fluorite, cryolite, and fluoroapatite, release F in substantial amounts upon dissolution in water-(ii) a On the other hand, the development of agricultural chemicals, ceramics, glassware, refrigerants, polytetrafluoroethylene cookers and the like has increased F-And (4) discharging in water. Therefore, the treatment of fluorine-containing drinking water and industrial wastewater has been the focus of research in the field of water treatment. Particularly, in water-deficient areas in the northwest five provinces, due to the fact that surface water sources are lost, underground water and mine water generated by mining in the areas are used as main sources of local drinking water for a long time, the west parts mostly belong to high-fluorine strata, and large-scale high-strength development enables fluorine in the strata to be transferred to the underground water, so that the fluorine content of the underground water and the mine water exceeds the standard, and the underground water and the mine water are undoubtedly a potential harm factor for population health in the areas.
Precipitation is a frequently applied physical/chemical treatment process for removing metals and anions, such as sulfates, fluorides and phosphates, from process and waste waters. Eyes of a userThe former wastewater defluorination is generally carried out by adopting a chemical precipitation method, namely, the CaF is generated by the reaction of lime and fluorinion2Simultaneously, the pH value of the wastewater is adjusted to 10-11, and the CaF is reduced2After the solubility and the generated crystal precipitate are removed by using methods such as precipitation, filtration and the like, but a large amount of water-rich sludge is generated in the defluorination process, the settleability is poor, the solid-liquid separation is difficult, the sludge is difficult to recycle, and the effluent is difficult to reach the standard. In addition, since the precipitation method involves four separate process steps: coagulation, flocculation, sludge/water separation plus sludge dewatering, especially in settlers, requires high hydraulic retention time, and therefore the floor space required by conventional sedimentation processes is high. The adsorption method and the ion exchange method have the problems of complex operation conditions, solid waste treatment problem of the adsorbent or the ion exchanger, high cost, unsuitability for treatment of ultra-large water volume (about 10000-40000 cubic/day), and the like, and are difficult to popularize and apply in certain occasions such as mining areas. At present, with the development of membrane filtration technology, a part of mining areas use membrane treatment technology, but the current process has the following defects: the operation cost is high, the average water yield is low, the price of the membrane component is high, and the pollution is easy; meanwhile, part of mineral substances beneficial to human bodies are removed in the defluorination process, and the defluorination process is not suitable for being used as drinking water for life for a long time. An advanced alternative to the conventional precipitation treatment process is the fluidized bed type crystallizer crystallization process, which is capable of producing high purity, almost dry pellets. The crystallization process results in particles of high purity compared to precipitated sludge, and the particles can generally be recovered or reused in other plants, thereby reducing the production of residual waste. However, calcium fluoride particles are usually obtained by removing fluorine by the existing fluidized bed crystallizer crystallization method, and calcium fluoride is difficult to separate due to light precipitate quality and poor settleability. In addition, the particles are discharged periodically after the conventional crystallizer is crystallized, wherein the particles contain particles which do not grow up, so that seed crystals are wasted, and more new seed crystals need to be added.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a fluoride removal method for fluoride-containing wastewater and a fluidized bed crystallization separator for fluoride removal. The method has the advantages of simple operation condition, low treatment cost, good treatment effect, lower concentration of fluorine ions in the effluent, no need of sludge dehydration and less seed crystal consumption.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a fluidized bed crystallization separator for fluorine removal, comprising: the device comprises a cylinder body, a guide cylinder, a screening device and a return pipe; wherein the content of the first and second substances,
the barrel is a vertically-arranged hollow cylinder with two closed ends, a water distribution area, a medicine distribution area, a granulation area and a clear water area are sequentially arranged in the barrel from bottom to top, a water inlet and a medicine feeding opening are formed in the lower portion of the barrel, and a water outlet and a seed crystal feeding opening are formed in the upper portion of the barrel;
the guide cylinder is arranged in the cylinder body and is coaxial with the cylinder body, and is used for dividing a granulation area in the cylinder body into a fluidization area, a separation area and a static settling area; the region inside the guide shell close to the bottom is the fluidization region, the region inside the guide shell close to the top is the separation region, and the region between the guide shell and the barrel is a static settling region; when the device is operated, the seed crystals circularly flow among the fluidization area, the separation area and the static settling area, and fluorine ions in the fluorine-containing wastewater realize chemical crystallization and circular granulation in the flowing process;
the screening device is arranged in the cylinder body, is arranged between the water distribution area and the medicine distribution area and is used for screening the settled particles; the screening device comprises a screen and a storage device arranged below the screen, the larger-size particles obtained by screening are intercepted above the screen, and the smaller-size particles obtained by screening are stored in the storage device;
one end of the backflow pipe is connected with the seed crystal feeding port, and the other end of the backflow pipe is connected with the storage device and used for enabling the particles with smaller sizes to flow back to the granulation area for recycling.
As a preferred embodiment, the fluidized bed crystallization separator for removing fluorine is further provided with a stirrer in the guide cylinder, and is used for promoting the reaction, crystallization and granulation of fluorine-containing wastewater and a fluorine-removing agent; the agitator is preferably a lift agitator.
The fluidized bed crystallization separator for removing fluorine, as a preferred embodiment, further comprises: the sedimentation inclined plate is arranged above the guide cylinder and used for guiding the particles in the separation area to settle; preferably, the sedimentation sloping plate is in a vertical truncated cone shape, and the lower edge of the sedimentation sloping plate is connected with the upper edge of the guide cylinder in a sealing manner.
The method for removing fluorine from fluorine-containing wastewater is realized by the fluidized bed crystallization separator, and comprises the following steps:
the method comprises the following steps: inputting fluorine-containing wastewater into the bottom of the fluidized bed crystallization separator, so that the wastewater is lifted from bottom to top in the guide cylinder and then falls out of the guide cylinder, thus forming a cycle;
step two: putting crystal nuclei as a trigger through the seed crystal putting port, and forming the fluidization area in the guide shell; adding a defluorination agent through the dosing port to enable the fluorine-containing wastewater and the defluorination agent to be mixed and react to form fluoride precipitate, then enabling crystal nuclei to grow into crystal seeds through fluoride tiny crystals generated by adsorption reaction when flowing through the fluidization region, and continuously attaching the fluoride tiny crystals to the surface of the crystal seeds to form multilayer crystal particles; the wastewater continuously enters a separation area upwards, heavier particles settle down in the static settling area, a mixture of the lighter particles and water continuously rises and forms a sludge layer on the upper part of the separation area, and clean water after defluorination gradually enters the clean water area and is discharged through a water outlet;
and step three, screening the settled particles through the screening device, conveying the particles with smaller sizes to the seed crystal feeding opening through the return pipe for recycling, and periodically discharging the particles with larger sizes.
In the fluorine-containing wastewater defluorination method, as a preferred embodiment, the defluorination agent comprises a defluorination agent, and the pH value of the defluorination agent is 7.0-9.0; the defluorinating agent is more preferably CaHPO4·2H2O。
In the fluorine-containing wastewater defluorination method, as a preferred embodiment, the crystal nucleus is sand or mineral; the sand is preferably quartz sand, and the mineral substance is preferably fluorapatite crystals; more preferably, the grain size of the crystal nucleus is 0.1-1 mm.
In a preferred embodiment of the above method for removing fluorine from fluorine-containing wastewater, the ratio of the amount of the fluorine removal agent to the fluorine ion content in the fluorine-containing wastewater is in stoichiometric excess of 10% to 20%.
Compared with the prior art, the utility model discloses have following beneficial effect and do:
(1) the application provides a novel fluidized bed crystallization separator for defluorination, wherein a screening device is arranged at the bottom of the fluidized bed crystallization separator and can screen settled crystal particles, and the screened small particles and a certain amount of fresh seed crystal material return to a fluidized bed to participate in reaction, so that the material is saved;
(2) the application provides a novel fluidized bed crystallization separator for defluorination and a defluorination method of fluorine-containing wastewater, and a novel defluorination agent CaHPO is adopted4·2H2O, fluorine-containing crystals with better settleability can be generated, and the concentration of fluorine ions in effluent is lower; the crystal can be directly obtained by the seed crystal method without sludge dehydration;
(3) the method does not need to use a filter or other mechanical dehydration equipment, the dried solid crystal is more than 90 percent, and the method can be used for chemical mineral raw materials and laser emission materials.
Drawings
FIG. 1 is a schematic view showing the structure of a fluidized bed crystallization separator for fluorine removal used in a preferred embodiment of the present invention;
in the figure, 1-a water inlet pipe, 2-a medicine feeding pipe, 3-a granulation area, 4-a static sedimentation area, 5-a separation area, 7-a clear water area, 8-a sedimentation inclined plate, 9-a screening device, 10-a storage device, 11-a return pipe, 12-a water outlet pipe and 14-a stirrer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, examples and comparative examples. It should be understood that these examples are for illustration and explanation only and are not intended to limit the scope of the present invention; after reading the disclosure of the present invention, various changes or modifications may be made by those skilled in the art, and equivalents may fall within the scope of the invention defined by the appended claims.
The technical proposal of the utility model can be that the raw materials can be products sold in the market and can be self-made by conventional means.
In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, top, bottom" are generally used with respect to the orientation shown in the drawings or the description of the positional relationship of the components with respect to each other in the vertical, or gravitational direction; "inner and outer" generally refers to the interior and exterior of a chamber relative to the chamber. The above directional terms are defined for the convenience of understanding the present invention and therefore do not constitute a limitation on the scope of the present invention.
As shown in figure 1, the utility model provides a novel fluidized bed crystallization separator for defluorination, a water distribution area, a medicine distribution area, a granulation area and a clear water area are sequentially arranged in a cylinder cavity of a cylinder body of the crystallization separator from the bottom to the top; wherein, the water distribution area is used for uniformly distributing the input fluorine-containing wastewater; the distribution area is a place for putting a defluorination agent for mixing the fluorine-containing wastewater with the defluorination agent and reacting to generate fluoride precipitate; the granulation area is a place where fluoride precipitates are attached to seed crystals for crystallization so as to form crystal nuclei and grow into crystal grains; the clear water area is a place where clear water is gathered after the fluorine is removed. That is, when the fluidized bed crystallization separator for defluorination is operated, the fluorine-containing wastewater enters the barrel cavity and then is distributed from the water distribution area, then enters the medicine distribution area to be mixed with the defluorination agent and react to generate fluoride precipitate, then the wastewater enters the granulation area, the fluoride precipitate is attached to the seed crystal to be crystallized to form crystal nucleus and grow up into crystal grains, namely, granulation defluorination is carried out, and finally, the clean water after defluorination enters the clean water area to be discharged.
Specifically, the fluidized bed crystallization separator for fluorine removal comprises: the barrel with set up draft tube, the screening plant in barrel inside. The above components are explained one by one below.
The cylinder body is a place where the whole process of treating the desulfurization wastewater comprises water distribution, mixing reaction with a defluorination medicament, crystallization granulation, clean water separation and particle sedimentation, the lower part of the cylinder body is provided with a water inlet and a medicament adding port which are respectively used for inputting the desulfurization wastewater to be treated and adding the defluorination medicament, and the upper part of the cylinder body is provided with a water outlet and a seed crystal putting port which are respectively used for outputting the defluorinated clean water and putting the seed crystal used as a crystallization site.
In the specific embodiment of the utility model, the cylinder body is a hollow cylinder body with two closed ends, and a water distribution area, a medicine distribution area, a granulation area and a clear water area are sequentially arranged in the cylinder cavity of the cylinder body from the bottom to the top; a water inlet at the lower part of the cylinder is connected with the water inlet pipe 1, and the desulfurization wastewater enters the water distribution area through the water inlet; the dosing port at the lower part of the cylinder body is connected with the dosing pipe 2, the other end of the dosing pipe 2 is connected with the medicament tank, the prepared defluorination medicament is added into the medicament tank in advance, and the defluorination medicament is added into the medicament distribution area and reacts with the desulfurization wastewater reaching the medicament distribution area when the defluorination medicament is used; the seed crystal feeding port on the upper part of the cylinder body is connected with the seed crystal feeding device through a seed crystal feeding pipe and is used for feeding seed crystals into the cylinder body so as to provide sites for attaching coating crystals formed by the reaction of a defluorination reagent and fluorine ions; the upper part of the cylinder body is also provided with a water outlet which is connected with a water outlet pipe 12 and used for outputting defluorinated clear water generated by the clear water area; the middle of the cylinder body is a granulation area, the added crystal seeds are kept in a fluidized state through pumped fluorine-containing wastewater, and crystals formed by the reaction of the crystal seeds adsorbing a fluorine removal reagent and fluorine ions gradually grow up to form granules and are separated from water. Preferably, the medicine distribution area is positioned above the water distribution area, so that the water distribution is more favorable for full water distribution and full contact and quick reaction of the waste water and the medicine. The seed crystal is put into the barrel through the seed crystal input pipe, specifically, the exit end of crystal input pipe can be located the disengagement zone top, also can be located the granulation district.
The crystal seed is used as a crystallization site, has high surface area and can effectively reduce the energy required by precipitation, so that fluoride crystals formed by the reaction of the fluorine removal reagent and fluorine ions are gradually adsorbed on the surface of the crystal seed and gradually move towards the bottom along with the growth of the crystals, thereby separating from water.
The guide cylinder is arranged in the cylinder body and is coaxial with the cylinder body, and is used for dividing a granulation area in a cylinder cavity of the cylinder body into a fluidization area, a separation area and a static settling area, wherein the area, close to the bottom, in the fluidization area is the fluidization area, fluorine-containing wastewater and a fluorine removal agent in the fluidization area continuously react to generate fluoride precipitate, and the fluoride precipitate is attached to crystal seeds to be crystallized to form crystal nuclei and grow into crystal grains; the area close to the top in the draft tube is a separation area, crystal particles in the wastewater are separated, particles which are fully granulated are heavier and can be settled by means of self weight, particles which are not fully granulated are lighter and float on the upper part of the separation area to form a sludge layer, and the sludge layer not only can isolate clear water after defluorination, but also can play a role in filtering suspended matters, so that the quality of the clear water is further improved; the area between the guide shell and the cylinder is a static settling area which is a place where fully granulated particles settle by means of self weight.
The utility model discloses an in the embodiment, the draft tube is the open cavity cylinder in both ends, sets up in the inside lower part position that is close to of barrel, and coaxial with the barrel, and the lower limb of draft tube is close to with pencil 2, and the exit end that adds pencil 2 lies in the centre of the lower limb that is close to the draft tube, is favorable to the quick mixing of defluorinating medicament and fluoride waste water.
And the screening device is arranged in the barrel body and between the water distribution area and the medicine distribution area and is used for receiving and screening the settled granules to separate out larger-size granules and smaller-size granules. Specifically, in the specific embodiment of the present application, the screening device comprises a screen and a storage device 10 arranged below the screen, the storage device is connected with the seed crystal feeding port through a return pipe 11, during operation, settled particles fall on the screen, after screening, the particles with larger size are intercepted above the screen and periodically discharged; the smaller particles fall into a storage device below the screen and flow back through a return pipe (usually by pumping) to the seed feeding port to react with a certain amount of fresh seeds returning to the fluidized bed. Preferably, the aperture size of the screen is 1.0-2.0 mm.
In the fluidized bed crystallization separator for removing fluorine, preferably, a stirrer is further arranged in the guide cylinder and used for promoting the reaction of the fluorine-containing wastewater and the fluorine-removing agent and crystallization granulation; the stirrer 14 is preferably a lifting stirrer and can be used for assisting the upward flow of the fluorine-containing wastewater in the guide shell, so as to be beneficial to the stable operation of the fluidized bed. The utility model discloses an in the concrete embodiment, the axle of agitator is installed in the bottom of barrel, stirring vane stretches into in the draft tube, in operation, the rotatory fluid mixture that promotes of promotion formula agitator promotes and has promoted the fluoride-containing waste water that has mixed with defluorination reagent to flow to the draft tube, and order about it and flow upwards in the draft tube, through fluidization district, the disengagement zone obtains the clear water after the defluorination, and the aggregate that the seed crystal absorption fluoride crystallization in the fluidization district formed gets into quiet heavy district and subsides, promptly, the seed crystal is in fluidization district, the circulation flow between disengagement zone and the quiet heavy district, the fluorine ion of aquatic realizes chemical crystallization circulation granulation at the flow in-process.
The fluidized bed crystallization separator for removing fluorine preferably further comprises a sedimentation inclined plate 8 which is arranged above the guide cylinder and guides the particles in the separation zone to settle; the utility model discloses an in the concrete embodiment, subside the circular cone form that the swash plate 8 is erect, subside the lower edge of swash plate 8 and the sealed connection of the last reason of draft tube, make the interior fluid of outflow of draft tube only can continue to rise the inside of flowing through subside swash plate 8, walk around the last reason of subsiding swash plate 8 and get into the disengagement zone, this structure not only can be used for accelerating the separation of solid-liquid mixture in the disengagement zone and subside, still is favorable to guiding the interior fluid of draft tube to move upwards and gets into the disengagement zone simultaneously.
The utility model also correspondingly provides a fluorine removal method for fluorine-containing wastewater, which is realized by the fluidized bed crystallization separator and comprises the following steps:
the method comprises the following steps: inputting fluorine-containing wastewater into the bottom of a fluidized bed crystallization separator, starting a stirrer to lift the wastewater in a guide cylinder from bottom to top, and then falling outside the guide cylinder, thus forming circulation;
step two: putting crystal nucleus as a trigger through a crystal seed putting port, and forming a fluidization area in the guide shell; adding a defluorination agent through a dosing port to enable the fluorine-containing wastewater and the defluorination agent to be mixed and react to form fluoride precipitate, then growing the fluoride micro-crystals generated by adsorption reaction of crystal nuclei to form crystal seeds when flowing through a fluidization region, and continuously attaching the fluoride micro-crystals to the surface of the crystal seeds to form multilayer crystal particles; the wastewater continuously enters the separation area upwards, the heavier particles settle down in the static settling area, the mixture of the lighter particles and water continuously rises and forms a sludge layer on the upper part of the separation area, and the clean water after defluorination gradually enters the clean water area and is discharged through the water outlet;
and step three, screening the settled particles through a screening device, conveying the smaller particles to a seed crystal feeding port for recycling, and outputting the larger particles periodically.
The chemical principles of the above-described defluorination process are the same as those of the conventional precipitation process, all by adding a suitable reagent to the water, exceeding the solubility of the target component, and subsequently converting it from an aqueous solution to a solid crystalline material. The present application provides methods in which fluoride ions in wastewater are reacted with a fluorine removal agent to form fluoride crystals (e.g., Ca)10(PO4)6F2Crystals) attached to the surface of the crystal nucleus, wherein after the fluidized bed runs for 2-5 days, a layer of active film is formed on the surface of sand grains, the crystals reaching and approaching the active film are attached to the active film, and when the surface of the film is fully attached with the crystals, the crystals become crystal seeds; the seed crystal provides a carrier and a place for the growth of the crystal, and a plurality of layers of crystal particles are formed on the surface of the seed crystal, so that the separation and the recycling are convenient; in the crystallization process, the phase transformation can be accurately controlled, and finally, crystalline particles with the particle size of about 100 mu m-2 mm are produced instead of finely dispersed microscopic sludge particles. In order to crystallize the target component on the fluidized bed, a driving force is generated by the reagent dosage (amount of the fluorine removing agent), and sometimes it is necessary to adjust the pH of the fluorine removing agent. By selecting appropriate process conditions, co-crystallization of impurities is minimized and high purity crystals are obtained.
In the above method for removing fluorine from fluorine-containing mine drainage, as a preferred embodiment, the fluorine-removing agent used in the crystallization step comprises a fluorine-removing agent, and the fluorine-removing agent may be CaCl2Etc., however, it has been found by the utility model that the defluorinating agent is preferably CaHPO4·2H2O, the pH value of the defluorination agent is 7.0-9.0. The fluorine removing agent can be used according to the use mode of the fluorine removing agent in the prior art and can also be matched with a buffer solution. The utility model discloses the discovery adopts defluorinating agent to be CaHPO4·2H2O is particularly effective, and the crystallization process is shown as the following formula I and formula II:
10CaHPO4·2H2O+2F-→Ca10(PO4)6F2↓+4HPO4 2-+6H++20H2o (formula I)
6CaHPO4·2H2O+2F-+4Ca2+→Ca10(PO4)6F2↓+6H++12H2O (formula II)
Adopts defluorinating agent CaHPO4·2H2O, after the fluidized bed starts to operate for 2-5 days, a layer of active film is formed on the surface of sand grains, the active film starts to adsorb fluoride crystals reaching and approaching the active film, and the active film becomes seed crystals when the surface of the film is fully attached with the crystals, so that the initiator does not need to be added subsequently, and the subsequent Ca is added subsequently10(PO4)6F2The reaction can continue by spontaneous seeding.
In the fluorine-containing mine drainage fluorine removal method, as a preferred embodiment, the crystal nucleus is preferably sand or mineral; the sand is preferably quartz sand, and the mineral substance is preferably fluorapatite crystals; the grain size of the crystal nucleus is preferably 0.1-1 mm.
In the fluorine-containing mine drainage fluorine removal method, as a preferred embodiment, the ratio of the dosage of the fluorine removal agent to the content of fluorine ions in the wastewater is 10-20% excess calculated according to the stoichiometric calculation.
To sum up, the utility model provides a fluoride waste water defluorinating method and for defluorination fluidized bed crystal separator: (1) with the new defluorination agent, new precipitate Ca which is easier to crystallize is formed10(PO4)6F2(ii) a (2) Screening and refluxing are carried out in the granulation process, only the particles growing to be more than a certain particle size are discharged, and other small particles are refluxed, so that the seed crystal material is saved.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical concept of the present invention, and these simple modifications all belong to the conventional replacement or the conceivable of those skilled in the art, and thus belong to the protection scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.
In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.
Claims (5)
1. A fluidized bed crystallization separator for defluorination, comprising: the device comprises a cylinder body, a guide cylinder, a screening device and a return pipe; wherein the content of the first and second substances,
the barrel is a vertically-arranged hollow cylinder with two closed ends, a water distribution area, a medicine distribution area, a granulation area and a clear water area are sequentially arranged in the barrel from bottom to top, a water inlet and a medicine feeding opening are formed in the lower portion of the barrel, and a water outlet and a seed crystal feeding opening are formed in the upper portion of the barrel;
the guide cylinder is arranged in the cylinder body and is coaxial with the cylinder body, and is used for dividing a granulation area in the cylinder body into a fluidization area, a separation area and a static settling area; the region inside the guide shell close to the bottom is the fluidization region, the region inside the guide shell close to the top is the separation region, and the region between the guide shell and the barrel is a static settling region; when the device is operated, the seed crystals circularly flow among the fluidization area, the separation area and the static settling area, and fluorine ions in the fluorine-containing wastewater realize chemical crystallization and circular granulation in the flowing process;
the screening device is arranged in the cylinder body, is arranged between the water distribution area and the medicine distribution area and is used for screening the settled particles; the screening device comprises a screen and a storage device arranged below the screen, the larger-size particles obtained by screening are intercepted above the screen, and the smaller-size particles obtained by screening are stored in the storage device;
one end of the backflow pipe is connected with the seed crystal feeding port, and the other end of the backflow pipe is connected with the storage device and used for enabling the particles with smaller sizes to flow back to the granulation area for recycling.
2. The fluidized bed crystallization separator for defluorination as set forth in claim 1, wherein a stirrer is further provided in said draft tube for promoting the reaction and crystallization granulation of fluorine-containing wastewater and defluorination agent.
3. The fluidized bed crystallization separator for fluorine removal as set forth in claim 2, wherein said agitator is a lift agitator.
4. The fluidized bed crystallization separator for fluorine removal according to any one of claims 1 to 3, further comprising: and the sedimentation inclined plate is arranged above the guide cylinder and used for guiding the particles in the separation area to settle.
5. The fluidized bed crystallization separator for defluorination of claim 4, wherein said inclined settling plate is in the shape of a vertical truncated cone, and the lower edge of said inclined settling plate is connected with the upper edge of said draft tube in a sealing manner.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627177A (en) * | 2019-09-26 | 2019-12-31 | 北京朗新明环保科技有限公司 | Fluorine removal method for fluorine-containing wastewater and fluidized bed crystallization separator for fluorine removal |
| CN114130637A (en) * | 2021-11-26 | 2022-03-04 | 西安西热水务环保有限公司 | High-efficient fractionation device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110627177A (en) * | 2019-09-26 | 2019-12-31 | 北京朗新明环保科技有限公司 | Fluorine removal method for fluorine-containing wastewater and fluidized bed crystallization separator for fluorine removal |
| CN114130637A (en) * | 2021-11-26 | 2022-03-04 | 西安西热水务环保有限公司 | High-efficient fractionation device |
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