A sodium fluorosilicate treatment system and method

Abstract

The application provides a sodium fluorosilicate treatment system and method, which comprises a dryer, a multi-tube separator and a drum cooler connected in sequence, a discharge port of the dryer is connected with a feeding port of the multi-tube separator, a discharge port of the multi-tube separator is connected with a feeding port of the drum cooler, and the sodium fluorosilicate treatment system further comprises a hot blast furnace, and a gas outlet of the hot blast furnace is connected with an air inlet of the dryer. The above technical scheme has the advantages of structural optimization and process improvement of the sodium fluorosilicate treatment system, and the comprehensive technical effects of high dust removal efficiency, stable operation, water saving and consumption reduction, high material recovery rate, convenient maintenance and environmental protection standard reaching are realized.

Description

Technical Field

[0001] This invention relates to the field of environmental protection treatment technology, and in particular to a sodium fluorosilicate treatment system and method. Background Technology

[0002] In the phosphoric acid chemical production process, sodium fluorosilicate is an important byproduct of the wet-process phosphoric acid purification stage. Its production process typically includes drying, cooling, dust removal, and recovery. Existing sodium fluorosilicate treatment systems generally employ diffusion cyclone separators for initial gas-solid separation, coupled with electrostatic precipitators for tail gas purification. The drum coolers directly use primary tap water as the cooling medium. Traditional diffusion cyclone separators have low separation efficiency and poor capture of fine sodium fluorosilicate dust, easily leading to material loss. Insufficient dust removal efficiency increases system resistance and causes fluctuations in operating conditions, forcing production units to operate at reduced load for extended periods, thus affecting overall production capacity. Summary of the Invention

[0003] This invention provides a sodium fluorosilicate treatment system to solve the technical problems of low dust removal efficiency, unstable operation, high water consumption, high production cost, and easy exceedance of exhaust gas standards in existing sodium fluorosilicate treatment systems.

[0004] Optionally, a sodium fluorosilicate treatment system includes a dryer, a multi-tube separator, and a drum cooler connected in sequence. The discharge port of the dryer is connected to the inlet of the multi-tube separator, and the discharge port of the multi-tube separator is connected to the inlet of the drum cooler. The sodium fluorosilicate treatment system also includes a hot air furnace, the outlet of which is connected to the inlet of the dryer.

[0005] The advantages of adopting the above technical solution are that the dryer, multi-tube separator and drum cooler are connected in sequence in the forward direction, and the material flow is smooth; the hot air furnace directly heats the dryer, the heat energy utilization rate is high, the overall device has a compact structure and a small footprint, reducing equipment investment and infrastructure costs.

[0006] Optionally, the sodium fluorosilicate treatment system includes a dust collector connected to the outlet of the multi-tube separator.

[0007] Optionally, the multi-tube separator includes a main pipe and multiple separation pipes, one end of the main pipe is connected to the feed inlet of the multi-tube separator, and the other end of the main pipe is connected to all the separation pipes simultaneously; The separator tube is equipped with a guide member inside, which is used to rotate the airflow entering the separator tube.

[0008] Optionally, the guide includes a mounting shaft and helical blades arranged axially thereon, the guide being mounted on the inner wall of the separation tube.

[0009] Optionally, the multi-tube separator further includes a fixing plate, which has multiple mounting ports, each corresponding to a separate tube. The separate tubes are vertically inserted into the corresponding mounting ports, and the fixing plate has multiple vent holes.

[0010] Optionally, the separation pipe includes two guide sections and a rotating section. One guide section is bent and connected to the main pipe, and the other guide section is inserted into the corresponding installation port. One end of the rotating section is connected to one of the guide sections, and the other end of the rotating section is connected to the other guide section.

[0011] Optionally, a connecting sleeve is fitted on the outer wall of the guide section, and the outer walls of the rotating section and the corresponding guide section are threaded, with the connecting sleeve threaded at both ends of the rotating section.

[0012] Optionally, a hopper is provided below the fixed plate, with the large end of the hopper connected to the outer edge of the fixed plate and the small end of the hopper connected to the feed inlet of the drum cooler.

[0013] Optionally, the dust collector includes a housing, an exhaust pipe, a lower housing, and multiple filter baffles. All the filter baffles are arranged vertically and evenly. All the filter baffles are located inside the housing. The exhaust pipe is located above the housing, and the lower housing is located below the housing. The lower housing is used to collect dust.

[0014] Optionally, the present invention also discloses a method for treating sodium fluorosilicate, including the above-described sodium fluorosilicate treatment system, comprising the following steps: S1: Sodium fluorosilicate containing water is fed into a dryer, and hot air is provided by a hot air furnace to dry the sodium fluorosilicate, resulting in a dry dust-containing gas-solid mixture; S2: The gas-solid mixture enters the multi-tube separator, and the gas-solid mixture is centrifugally separated by multiple separation tubes to initially separate the sodium fluorosilicate dust from the gas. The separated solid material enters the drum cooler for cooling to obtain the cooled finished product. S3: The gas, after initial separation by the multi-tube separator, enters the dust collector and is further purified by multiple filter baffles. The gas meets the standards and is discharged externally, while the dust collected by the filter is recycled back into the lower chamber. S4: The drum cooler uses circulating cooling water for cooling, achieving water-saving operation. After cooling, the finished product is weighed, packaged, and then transported into the warehouse.

[0015] The beneficial effects of this invention are: structural optimization and process improvement of the sodium fluorosilicate treatment system, achieving comprehensive technical effects such as high dust removal efficiency, stable operation, water saving and consumption reduction, high material recovery rate, convenient maintenance, and environmental compliance. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a flowchart illustrating an embodiment of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of a multi-tube separator provided in one embodiment of the present invention; Figure 3 This is a partial cross-sectional schematic diagram of a dust collector provided in one embodiment of the present invention.

[0018] The attached figures are labeled as follows: Dryer 1, multi-tube separator 2, main pipe 201, separation pipe 202, fixed plate 203, guide component 204, collection hopper 205, connecting cylinder 206, drum cooler 3, hot air furnace 4, dust collector 5, box body 501, exhaust pipe 502, lower box body 503, filter baffle 504, fan 6. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] An exemplary sodium fluorosilicate processing system includes a dryer 1, a multi-tube separator 2, and a drum cooler 3 connected in sequence. The outlet of the dryer 1 is connected to the inlet of the multi-tube separator 2, and the outlet of the multi-tube separator 2 is connected to the inlet of the drum cooler 3. The sodium fluorosilicate treatment system also includes a hot air furnace 4, the air outlet of which is connected to the air inlet of the dryer 1. A fan 6 is installed at the air inlet of the hot air furnace 4 to introduce air into the hot air furnace 4. A gas conduit is also provided on the hot air furnace 4 to provide a heat source for the hot air furnace 4.

[0023] It should also be noted that by using a multi-tube separator 2 instead of a traditional diffusion cyclone separator, the multi-unit centrifugal separation effect can achieve better collection of fine sodium fluorosilicate dust, effectively reduce material loss, and improve product recovery rate.

[0024] Furthermore, the multi-tube separator 2 features uniform airflow distribution, low system resistance, and is less prone to clogging, solving the problem of traditional separation equipment causing fluctuations in operating conditions and forcing the unit to operate at reduced load, thus achieving long-cycle, full-load continuous and stable production.

[0025] For example, the sodium fluorosilicate treatment system includes a dust collector 5, which is connected to the outlet of the multi-tube separator 2.

[0026] It should also be noted that the purpose of this setup is to further intercept fine sodium fluorosilicate dust, improve purification efficiency, and ensure that exhaust gas meets emission standards.

[0027] For example, the multi-tube separator 2 includes a main pipe 201 and a plurality of separation pipes 202. One end of the main pipe 201 is connected to the feed inlet of the multi-tube separator 2, and the other end of the main pipe 201 is connected to all the separation pipes 202. The separation tube 202 is provided with a guide 204 inside, which is used to rotate the airflow entering the separation tube 202.

[0028] It should also be noted that the purpose of this setup is to centrally feed the main pipeline and simultaneously connect all separation pipes 202, so that the dust-laden gas-solid mixture is evenly distributed to each separation pipe 202, avoiding local flow deviation and overload, and ensuring consistent separation efficiency in each unit. Guide components 204 are installed inside the separation pipes 202 to force the airflow to form a stable high-speed rotating flow field. Under the action of centrifugal force, the sodium fluorosilicate dust is quickly thrown towards the pipe wall and settles, which greatly improves the fine particulate dust collection rate and reduces material loss.

[0029] For example, the guide 204 includes a mounting shaft and a helical blade arranged along its axial direction. The guide 204 is mounted on the inner wall of the separation tube 202, and the helical blade is fixedly connected to the inner wall of the separation tube 202.

[0030] It should also be noted that the spiral blades can force the gas-solid mixture entering the separation tube 202 to rotate at high speed along a fixed trajectory, generating a stable centrifugal force that quickly throws the fine sodium fluorosilicate dust toward the tube wall, greatly improving the separation effect.

[0031] Furthermore, the separator 202 can also adopt a tangential air inlet, which, together with the central swirl core tube, forms a natural swirling flow. This eliminates the need for built-in spiral blades, resulting in lower resistance, less dust accumulation, and greater wear resistance.

[0032] It should also be noted that by replacing the blades with an integrated spiral guide plate that is directly fixed to the pipe wall without a central mounting shaft, the flow area is larger, less prone to material blockage, and the dust removal is smoother.

[0033] For example, the multi-tube separator 2 further includes a housing and a fixing plate 203. The fixing plate 203 is provided with multiple mounting ports, each of which corresponds to a plurality of separation tubes 202. The separation tubes 202 are vertically inserted into the corresponding mounting ports. The fixing plate 203 is provided with multiple vent holes. The housing is fitted onto the fixing plate 203. The housing is provided with an air outlet, which is connected to the air inlet of the dust collector 5.

[0034] It should also be noted that multiple installation ports correspond one-to-one with the separator tubes, ensuring that each separator tube is vertically aligned, evenly spaced, and has consistent airflow distribution, avoiding flow deviation and crossflow, and ensuring that each separator tube is in optimal working condition.

[0035] For example, the separation pipe 202 includes two guide sections and a rotating section. One of the guide sections is bent and connected to the main pipe 201, and the other guide section is inserted into the corresponding installation port. One end of the rotating section is connected to one of the guide sections, and the other end of the rotating section is connected to the other guide section.

[0036] It should also be noted that the purpose of this setup is to achieve coordinated operation of two-stage dust removal, first coarse separation and then fine filtration, which can efficiently capture fine sodium fluorosilicate dust, and the purification effect is far superior to single-stage dust removal, ensuring that the exhaust gas consistently meets the standards.

[0037] For example, a connecting sleeve 206 is sleeved on the outer wall of the guide section, and the outer wall of the rotating section and the corresponding guide section are both threaded. The connecting sleeve 206 is threaded at both ends of the rotating section.

[0038] It should also be noted that this design allows for quick assembly and disassembly of the guide section and the rotating section through the threaded connection of the connecting cylinder, without the need for welding or special tools, making on-site maintenance and replacement of worn parts more efficient.

[0039] For example, a hopper 205 is provided below the fixed plate 203. The large end of the hopper 205 is connected to the outer edge of the fixed plate 203, and the small end of the hopper 205 is connected to the feed inlet of the drum cooler 3.

[0040] It should also be noted that the entire area below the fixed plate at the large opening end of the 205 collecting hopper can completely collect the sodium fluorosilicate solids separated and falling from the multi-tube separator, preventing material scattering, accumulation and dust leakage, and improving the material recovery rate.

[0041] For example, the dust collector 5 includes a housing 501, an exhaust pipe 502, a lower housing 503, and a plurality of filter baffles 504. All the filter baffles 504 are arranged vertically and evenly. All the filter baffles 504 are disposed inside the housing 501. The exhaust pipe 502 is disposed above the housing 501. The lower housing 503 is disposed below the housing 501 and is used to collect dust.

[0042] It should also be noted that the purpose of this setup is to distribute the air evenly and improve filtration efficiency. Multiple filter baffles are arranged vertically and evenly inside the housing to ensure that the airflow entering the dust collector is evenly distributed, avoiding excessively high local flow velocities or short circuits, increasing the effective filtration area, and achieving efficient interception of fine sodium fluorosilicate dust to ensure complete purification of the exhaust gas.

[0043] This invention also discloses a sodium fluorosilicate treatment system and method, comprising the following steps: S1: Sodium fluorosilicate containing water is fed into dryer 1, and hot air is provided by hot air furnace 4 to dry the sodium fluorosilicate, resulting in a dry dust-containing gas-solid mixture; S2: The gas-solid mixture enters the multi-tube separator 2, and the gas-solid mixture is centrifugally separated by multiple separation tubes 202 to initially separate the sodium fluorosilicate dust from the gas. The separated solid material enters the drum cooler 3 for cooling to obtain the cooled finished product. S3: The gas after preliminary separation by the multi-tube separator 2 enters the dust collector 5, and is deeply purified by multiple filter baffles 504. The gas meets the standards and is discharged. The dust collected by the filter is recycled into the lower box 503. S4: The drum cooler 3 uses circulating cooling water for cooling, achieving water-saving operation. After cooling, the finished product is weighed, packaged, and then transported into the warehouse.

[0044] In summary, this invention achieves comprehensive technical benefits, including high dust removal efficiency, stable operation, water conservation and consumption reduction, high material recovery rate, convenient maintenance, and environmental compliance, through structural optimization and process improvement of the sodium fluorosilicate treatment system.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A sodium fluorosilicate treatment system, characterized in that, It includes a dryer, a multi-tube separator, and a drum cooler connected in sequence; The discharge port of the dryer is connected to the inlet of the multi-tube separator, and the discharge port of the multi-tube separator is connected to the inlet of the drum cooler. The sodium fluorosilicate treatment system also includes a hot air furnace, the outlet of which is connected to the inlet of the dryer.

2. The sodium fluorosilicate treatment system according to claim 1, characterized in that: The sodium fluorosilicate treatment system includes a dust collector connected to the outlet of the multi-tube separator.

3. The sodium fluorosilicate treatment system according to claim 2, characterized in that: The multi-tube separator includes a main pipe and multiple separation pipes. One end of the main pipe is connected to the feed inlet of the multi-tube separator, and the other end of the main pipe is connected to all the separation pipes. The separator tube is equipped with a guide member inside, which is used to rotate the airflow entering the separator tube.

4. The sodium fluorosilicate treatment system according to claim 3, characterized in that: The guide includes a mounting shaft and helical blades arranged axially thereon, and the guide is mounted on the inner wall of the separation tube.

5. The sodium fluorosilicate treatment system according to claim 4, characterized in that: The multi-tube separator also includes a fixing plate, which has multiple mounting ports, each corresponding to a separate tube. The separate tubes are vertically inserted into their respective mounting ports, and the fixing plate has multiple vent holes.

6. The sodium fluorosilicate treatment system according to claim 5, characterized in that: The separation pipe includes two guide sections and a rotating section. One guide section is bent and connected to the main pipe, and the other guide section is inserted into the corresponding installation port. One end of the rotating section is connected to one of the guide sections, and the other end of the rotating section is connected to the other guide section.

7. The sodium fluorosilicate treatment system according to claim 6, characterized in that: A connecting cylinder is fitted on the outer wall of the guide section, and the outer wall of the rotating section and the corresponding guide section are threaded. The connecting cylinder is threaded at both ends of the rotating section.

8. The sodium fluorosilicate treatment system according to claim 7, characterized in that: A material collection hopper is provided below the fixed plate. The large end of the material collection hopper is connected to the outer edge of the fixed plate, and the small end of the material collection hopper is connected to the feed port of the drum cooler.

9. A sodium fluorosilicate treatment system according to claim 8, characterized in that: The dust collector includes a housing, an exhaust pipe, a lower housing, and multiple filter baffles. All the filter baffles are arranged vertically and evenly. All the filter baffles are located inside the housing. The exhaust pipe is located above the housing, and the lower housing is located below the housing. The lower housing is used to collect dust.

10. A method for treating sodium fluorosilicate, comprising the sodium fluorosilicate treatment system of claim 9, characterized in that, Includes the following steps: S1: Sodium fluorosilicate containing water is fed into a dryer, and hot air is provided by a hot air furnace to dry the sodium fluorosilicate, resulting in a dry dust-containing gas-solid mixture; S2: The gas-solid mixture enters the multi-tube separator, and the gas-solid mixture is centrifugally separated by multiple separation tubes to initially separate the sodium fluorosilicate dust from the gas. The separated solid material enters the drum cooler for cooling to obtain the cooled finished product. S3: The gas, after initial separation by the multi-tube separator, enters the dust collector and is further purified by multiple filter baffles. The gas meets the standards and is discharged externally, while the dust collected by the filter is recycled back into the lower chamber. S4: The drum cooler uses circulating cooling water for cooling, achieving water-saving operation. After cooling, the finished product is weighed, packaged, and then transported into the warehouse.

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