CN216273137U - A filtration, washing, dewatering system for baking soda production - Google Patents

Abstract

The utility model discloses a filtering, washing and dehydrating system for baking soda production in the baking soda production field, which comprises a carbonating tower, a high-level tank, a washing liquid tank, a backflushing tank and a siphon scraper centrifuge, wherein the carbonating tower is communicated with the high-level tank, the siphon scraper centrifuge comprises a rotary drum, the rotary drum is provided with a centrifugal cavity and a siphon cavity which are communicated, a filter screen is arranged in the centrifugal cavity, a spiral discharging device and a discharging device which extend into the centrifugal cavity are arranged on the outer side of the rotary drum, the high-level tank is connected with a feeding pipe which extends into the centrifugal cavity, the washing liquid tank is connected with a washing pipe which extends into the centrifugal cavity, and the backflushing tank is connected with a siphon pipe and a backflushing pipe which extend into the siphon cavity. The utility model can solve the problems of high moisture content and large fine grain loss of the baking soda produced by the prior art.

Description

A filtration, washing, dewatering system for baking soda production

Technical Field

The utility model relates to the field of baking soda production, in particular to a filtering, washing and dehydrating system for baking soda production.

Background

The production method of baking soda mainly includes synthesis method, double decomposition method and natural soda method. In the process of producing baking soda by a trona method, the filtration, washing and dehydration of baking soda crystal slurry are indispensable important links, and the following methods are mainly adopted at present:

1) and one-step method, a horizontal scraper centrifuge or a piston pusher centrifuge is selected for filtering, washing and dewatering. The main problems of the horizontal scraper centrifuge are that: the residual filter cake is easy to harden due to the continuous extrusion of the scraper in the discharging process; meanwhile, the solubility of the baking soda is limited, and the filter screen is not cleaned and regenerated thoroughly, so that the filtering time is long, the moisture content of a filter cake is higher (5-7%), and the production capacity is reduced. The main problems of the piston pusher centrifuge are as follows: the solid content of the baking soda crystal slurry cannot be too low, and preconcentration is needed to ensure that the solid content mass ratio of the crystal slurry is more than or equal to 25 percent; in addition, due to the limitation of processing technology, the gap between the mesh seams of the filtering screen of the piston pusher centrifuge cannot be too small, the minimum gap of the screen must be more than or equal to 65um, and the particle size of the solid-phase particles of the baking soda is in the range of 0.05-0.2 mm, so that the fine crystal loss is large in the pre-concentration, filtration, washing and dehydration processes.

2) Two-step process, the first step is to filter, wash and dewater by a rotary drum vacuum filter or a horizontal belt vacuum filter to reduce mother liquor, NaCl and Na₂SO₄And waiting for the content of impurities to obtain a filter cake with moisture content of 15-22%. And secondly, performing secondary dehydration on the 15-22% wet filter cake by using a piston pusher centrifuge to finally obtain a filter cake with the moisture content of 4-8% and the moisture content of higher. The two-step process has the following problems: large loss of fine grains, high moisture content, multiple auxiliary facilities, long process flow, large occupied area and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a filtering, washing and dehydrating system for baking soda production, which solves the problems of high moisture content and large fine grain loss of baking soda produced by the prior art.

In order to achieve the purpose, the basic technical scheme of the utility model is as follows: the utility model provides a filter, washing, dewatering system for baking soda production, including the carbonating tower, the elevated tank, the lotion jar, the recoil jar, siphon scraper centrifuge, the carbonating tower communicates with the elevated tank, siphon scraper centrifuge includes the rotary drum, the rotary drum is equipped with centrifugal chamber and the siphon chamber of intercommunication, be equipped with the filter screen in the centrifugal chamber, the rotary drum outside is equipped with spiral discharging device and the discharge apparatus who stretches into in the centrifugal chamber, the elevated tank is connected with the inlet pipe that stretches into in the centrifugal chamber, the lotion jar is connected with the washing pipe that stretches into in the centrifugal chamber, the recoil jar is connected with siphon and the recoil pipe that stretches into the siphon chamber.

The principle and the advantages of the scheme are as follows: in practical application, the carbonating tower is used as alkali liquor and CO₂Gas reaction vessel to produce NaHCO₃Crystal slurry, high-level tank for storing generated NaHCO₃Crystal slurry supplies to the siphon scraper centrifuge, a washing liquid tank is used for storing washing liquid for washing filter cakes in the siphon scraper centrifuge, and a backflushing tank is used for storing liquid obtained by centrifuging the siphon scraper centrifuge and is used as a liquid source for backflushing and washing a filter screen of the siphon scraper centrifuge. Siphon scraper centrifuge as NaHCO₃The main equipment for producing sodium bicarbonate by centrifugal dehydration of crystal mush, the rotary drum is used as carrier of centrifugal cavity, the centrifugal cavity is NaHCO₃A centrifugal dehydration space for crystal slurry, and a feed pipe for NaHCO in a high-level tank₃The crystal slurry is provided for the centrifugal cavity, the washing pipe is used for providing the washing liquid in the washing liquid tank for the centrifugal cavity to wash the obtained filter cake, and the filter screen is used for bearing NaHCO₃The crystal is separated from the liquid in the centrifugal process, the siphon cavity is used for guiding the centrifugally separated liquid out and discharging the liquid to a backflushing tank through the siphon pipe, the discharging device is used for discharging filter cakes obtained by centrifugation, washing and re-centrifugation in the centrifugal cavity, and the spiral discharging device is used for discharging the NaHCO obtained by discharging₃The crystal is led out to a siphon scraper for centrifugationOutside the machine. The scheme has the following advantages: 1) compared with a horizontal scraper centrifuge, the siphon scraper centrifuge has the advantages that siphon suction is added, so that the filtering driving force is larger, filter cakes with lower moisture content can be obtained, and the production capacity is higher; because no filter hole is arranged on the rotary drum of the siphon scraper centrifuge, the soaking and washing of filter cakes can be realized, the consumption of washing liquid is low, and the washing effect is better. The filter screen can be regenerated through back flushing and rinsing, and the regeneration effect is far better than that of a horizontal scraper centrifuge. Meanwhile, the washing liquid is used as the backflushing liquid, so that the expansion of the mother liquid can be effectively prevented. 2) Compared with a piston pusher centrifuge, the siphon scraper centrifuge is insensitive to the concentration and solid phase granularity change of sodium bicarbonate crystal slurry, and has stronger process adaptability and better washing effect. Meanwhile, during the processes of filtering, washing and dewatering, the loss of the sodium bicarbonate fine crystals is greatly lower than that of a piston pusher centrifuge. 3) Compared with a two-step method, the siphon scraper centrifuge has the advantages of less fine crystal loss, short process flow, less matched facilities, small occupied area and the like.

Further, an inner rotary drum is arranged in the centrifugal cavity, the inner rotary drum is made of a grid screen plate, the inner rotary drum is located between the filter screen and the inner wall of the rotary drum, a filter channel is formed between the inner rotary drum and the inner wall of the rotary drum, and the filter channel is communicated with the siphon cavity. Preferably, the inner rotary drum can provide stable and reliable support for the filter screen, ensure the stability of the filter channel and ensure the stable siphon liquid discharge process.

Furthermore, the discharging device is positioned above the feeding end of the spiral discharging device, a scraper with an upward cutting edge is arranged on the discharging device, and the scraper extends into the centrifugal cavity. The filter cake can be conveniently scraped into powder discharging through the scraper after completing centrifugal production as an optimization, and the subsequent drying treatment of the discharged product is more facilitated.

Furthermore, the top end of the carbonating tower is communicated with a separator, the bottom end of the separator is provided with a liquid return pipe communicated with the carbonating tower, and the top end of the separator is communicated with an airflow dryer through a pipeline. Preferably, the incompletely reacted high-temperature gas and the alkali liquor discharged from the carbonation tower can be effectively recovered through the separator, the gas is sent to the airflow dryer for drying treatment, the alkali liquor is sent to the carbonation tower again for continuous reaction, raw materials are fully utilized, and waste is reduced.

Further, spiral discharging device's discharge gate is equipped with lotion auto-change over device, and lotion auto-change over device's discharge gate below is equipped with belt conveyor, and the belt conveyor outside is equipped with the washing tank, and belt conveyor communicates with air dryer's feed end. The washing liquid switching device can be used for preferably realizing the switching of the baking soda product from the output of the belt conveying device to the drying and the cleaning and discharging of the residual filter cake to the cleaning tank, so that the discharging and the cleaning of the siphon scraper centrifuge are more convenient, and the production quality of the product is more favorably improved.

Further, the inlet pipe communicates with the bottom of high-order jar, and the high-end intercommunication of high-order jar has the overflow pipe, and the overflow pipe intercommunication has the alkali dissolving groove. Preferably NaHCO in such a high-level tank₃Under the action of gravity, the crystal slurry can be smoothly supplied to a siphon scraper centrifuge through a feeding pipe, and clear liquid on the upper part of the high-level tank can be conveyed to a caustic soda dissolving tank through an overflow pipe for treatment.

Furthermore, a backflushing pipe is connected to the middle part of the backflushing tank, a siphon pipe is communicated with the top of the backflushing tank, an overflow port is arranged at the upper part of the backflushing tank, a discharge port is arranged at the bottom end of the backflushing tank, and the overflow port and the discharge port are both communicated with an alkali dissolving tank. The liquid centrifuged by the siphon scraper centrifuge can be orderly and effectively utilized and treated as the preferable selection, so that the utilization rate of water resources in the system is improved, and the waste is reduced.

Furthermore, the siphon is connected with a tee joint, one end of the tee joint is connected with the check valve and communicated with the backflushing tank through a pipeline, and the other end of the tee joint is communicated with the alkali dissolving tank through a liquid discharge valve. Preferably, the process of separating the liquid in the siphon drag centrifuge is more controllable.

Further, the siphon tube is movable relative to the siphon chamber. Preferably, the siphon tube can swing back and forth, a variable liquid level difference Hu exists between the liquid suction port of the siphon tube and the outer side of the filter screen, and when the liquid suction port of the siphon tube is lower than the outer side of the filter screen, Hu is a positive value, and at the moment, the filtering driving force of the siphon scraper centrifuge is added with siphon suction force on the outer side of the filter screen besides the centrifugal force generated by high-speed rotation. When the heights of the liquid suction port of the siphon and the outer side of the filter screen are the same, Hu is 0, no siphon effect exists at the moment, and the filtering driving force only has centrifugal force; when the position of the liquid suction port of the siphon is higher than the outer side of the filter screen, Hu is a negative value, so that the siphon effect is not only avoided, but also the filtering is hindered, and the siphon scraper centrifuge realizes the filtering, washing and separating of the baking soda crystal slurry by using the change of Hu.

Furthermore, the end part of the feeding pipe positioned in the centrifugal cavity is connected with a fishtail-shaped distributor. Preferably, NaHCO is conveniently used₃The crystal mush is evenly distributed on the filter screen in the centrifugal cavity, which is more beneficial to the even dehydration in the centrifugal process and the stability of the rotary drum.

Drawings

FIG. 1 is a system flow diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a siphon drag centrifuge according to an embodiment of the present invention;

FIG. 3 is a diagram showing the relationship between the siphon liquid suction port and the siphon chamber in the embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a washing pipe 1, a feeding pipe 2, a spiral discharging device 3, a cover 4, a discharging device 5, a scraper 6, a rotary drum 7, a filter screen 8, an inner rotary drum 9, a cake layer 10, a siphon hole 11, a siphon liquid suction port 12, a siphon cavity 13, a rotary drum bottom 14, a siphon 15, a rear vertical plate 16, a machine base shell combination 17, a backflushing pipe 18, a residual cake layer 19, an air flow dryer 20, a washing liquid tank 21, a washing valve 22, a belt conveying device 23, a washing tank 24, a washing liquid switching device 25, a feeding valve 26, an overhead tank 27, a siphon scraper centrifuge 28, a backflushing valve 29, a tee joint 30, a check valve 31, a liquid discharge valve 32, a backflushing tank 33, a separator 34 and a carbonation tower 35.

The embodiment is basically as shown in the attached figure 1: the utility model provides a filtration, washing, dewatering system for baking soda production, includes carbonating tower 35, carbonating tower 35 is equipped with air inlet, returns liquid mouth, gas vent and arranges the thick liquid mouth, arranges the thick liquid mouth and has high-order jar 27 through the pipeline intercommunication, and high-order jar 27 is connected with overflow pipe and arranges the thick liquid pipe, and the overflow pipe intercommunication has the waste liquid pipe, and bolted connection has charge valve 26 on the thick liquid pipe, arranges thick liquid pipe intercommunication and has siphon scraper centrifuge 28. The air outlet is communicated with a separator 34 through a pipeline, the bottom end of the separator 34 is communicated with the liquid return port through a pipeline, and the top end of the separator 34 is communicated with the airflow dryer 20 through a pipeline.

As shown in fig. 2, the siphon scraper centrifuge 28 includes a cover 4 and a base-housing assembly 17, the base-housing assembly 17 includes a rear vertical plate 16, a rotary drum 7 is installed between the rear vertical plate 16 and the cover 4, the rotary drum 7 is driven to rotate by a motor installed on the outer side of the rear vertical plate 16, and the rotary drum 7 is bent inward toward the side wall of the cover 4 to form an annular centrifugal chamber. The lateral wall of rotary drum 7 towards back riser 16 one side extends the annular siphon chamber 13 of bending formation to the outside, wear to be equipped with siphon 15 and recoil pipe 18 on the back riser 16, siphon 15 is located back riser 16 upper portion and siphon imbibition mouth 12 and stretches into siphon chamber 13 up, siphon 15 bolted connection has tee bend 30, tee bend 30's one end is connected with flowing back valve 32, flowing back valve 32 and waste liquid pipe intercommunication, tee bend 30's other end intercommunication has recoil jar 33, be equipped with check valve 31 on the pipeline between tee bend 30 and the recoil jar 33. An overflow port communicated with the waste liquid pipe is arranged at the upper part of the backflushing tank 33, the bottom of the backflushing tank 33 is communicated with the waste liquid pipe, and a stop valve is arranged on a pipeline between the bottom of the backflushing tank 33 and the waste liquid pipe. The backflushing pipe 18 is positioned at the lower part of the rear vertical plate 16, the opening of the backflushing pipe 18 faces downwards and is aligned with the siphon cavity 13, the backflushing pipe 18 is communicated with the backflushing tank 33 through a pipeline, and a backflushing valve 29 is arranged on the pipeline between the backflushing pipe 18 and the backflushing tank 33. Screw connection has annular adversion drum 9 in the centrifugal chamber, and adversion drum 9 is made for the grid otter board, forms the filtration passageway between adversion drum 9 and the rotary drum 7, sets up the siphon hole 11 that communicates filtration passageway and siphon chamber 13 on the rotary drum end 14, and it has filter screen 8 to fill in the inboard centrifugal chamber of adversion drum 9.

Set up a plurality of through-holes on the cover 4 and wear to establish to be connected with from last spiral discharging device 3, inlet pipe 2 and the wash pipe 1 that distributes in proper order down, inlet pipe 2 and feed valve 26 intercommunication, the exit end welding of inlet pipe 2 has the fish tail shape distributing device who stretches into filter screen 8 top in the adversion drum 9. The washing pipe 1 is communicated with a washing liquid tank 21, the washing pipe 1 is connected with a washing valve 22 through a bolt, and the washing pipe 1 extends into the inner rotary drum 9 above the filter screen 8 and is provided with a plurality of small liquid outlet holes which are arranged side by side and face the filter screen 8. Spiral discharging device 3 includes a screw rod conveying cylinder, screw rod conveying cylinder top is equipped with discharge apparatus 5, discharge apparatus 5 includes scraper 6 and hydraulic telescoping rod, scraper 6 is located screw rod conveying cylinder feed inlet top and sets up towards the centrifugal chamber, but scraper 6 is driven by hydraulic telescoping rod vertical swing back and forth, screw rod conveying cylinder's discharge gate is located the cover 4 outside and sets up towards the opening down, screw rod conveying cylinder's discharge gate below is equipped with belt conveyor 23, belt conveyor 23 specifically is conventional transportation belt, belt conveyor 23 and air flow dryer 20 intercommunication, the belt conveyor 23 outside is equipped with washing tank 24, washing tank 24 and waste liquid pipe intercommunication. The discharge hole of the screw conveying cylinder is connected with a washing liquid switching device 25, and the washing liquid switching device 25 is a discharge pipe hinged to the discharge hole of the screw conveying cylinder.

As shown in fig. 3, the filtration driving force of the siphon blade centrifuge 28 depends on the pressure difference across the filter screen 8, and is proportional to the liquid level Ho in the drum 7 and inversely proportional to the thickness H' of the cake layer 10. The siphon scraper centrifuge 28 increases the pressure difference between the two sides of the filter medium by adopting the siphon principle at the outer side of the filter screen 8, and finally achieves the purpose of improving the filtering speed. Because the siphon 15 can swing back and forth, there is a variable liquid level difference Hu between the siphon liquid suction port 12 and the outside of the filter screen 8, when the siphon liquid suction port 12 is lower than the outside of the filter screen 8, Hu is positive, and at this time, the siphon scraper centrifuge 28 filters the centrifugal force generated by the high-speed rotation and adds a siphon force to the outside of the filter screen 8. When the heights of the siphon liquid suction port 12 and the outer side of the filter screen 8 are the same, Hu is 0, no siphon effect exists at the moment, and the filter driving force only has centrifugal force; when the position of the siphon liquid suction port 12 is higher than the outer side of the filter screen 8, Hu is a negative value, so that the siphon effect is not only eliminated, but also the filtration is hindered, and the siphon scraper centrifuge 28 utilizes the change of Hu to realize the filtration, washing and separation of the baking soda crystal slurry.

The specific implementation process is as follows: the clear, deslagging and filtered alkali liquor is sprayed into the carbonation tower 35 from the upper part and enters CO from the lower part of the carbonation tower 35₂The gas is carbonated at high temperature, and NaHCO is separated out after a period of time₃The crystal and crystal slurry are discharged from the bottom of the carbonating tower 35 and sent to the high-level tank 27, and the supernatant liquid of the high-level tank 27 overflows and then flows to the alkali dissolving tank through the overflow pipe. But not completely reacted high temperature CO₂After the gas and alkali liquid pass through the separator 34, the top CO₂The gas is sent to the gas flow dryer 20 and the bottom lye is re-introduced into the carbonation tower 35 from the liquid return port. When the siphon scraper centrifuge 28 is operating, the siphon tube 15 is first retracted to the starting position, i.e. outside the siphon chamber 13. Then, the backflushing valve 29 is opened, and the washing liquid in the backflushing tank 33 flows into the siphon cavity 13 at the rear end of the rotary drum 7 through the backflushing pipe 18. The liquid in the siphon cavity 13 forms a liquid ring under the action of centrifugal force generated by high-speed rotation, the liquid level in the siphon cavity 13 continuously rises along with the continuous addition of the backflushing liquid, and finally the liquid ring is pressed to the front end of the rotary drum 7 through the siphon hole 11 on the rotary drum bottom 14. On one hand, air between the filter screen 8 and the filter channel is discharged to enable the filter screen to be in a vacuum state, and meanwhile, a liquid ring is formed on the residual filter cake layer 19, so that the uniform distribution of materials during feeding is facilitated, and vibration is reduced; on the other hand, the filter screen 8 can be cleaned reversely, and the residual filter cake can be softened to prevent hardening. After the back flushing is finished, the charging valve 26 and the drain valve 32 are opened, the baking soda crystal pulp is uniformly distributed on the surface of the filter screen 8 in the rotary drum 7 through the charging pipe and the fishtail-shaped distributor, and the liquid suction port 12 of the siphon tube enters between 0 and + Hu. Under the dual actions of high-speed rotation centrifugal force and siphon force, the solid phase is intercepted by the filter screen 8 to form an annular filter cake, and the mother liquid phase passes through the filter screen 8, enters the siphon cavity 13 through the filtering channel between the filter screen 8 and the inner wall of the rotary drum 7 and the siphon hole 11, and is finally discharged to the alkali dissolving tank through the siphon pipe 15 and the waste liquid pipe. The cake layer 10 in the drum 7 increases in thickness with the increase of the charging time, and the charging valve 26 is closed when the cake layer 10 in the drum 7 reaches a predetermined level. After the mother liquor is removed for a period of time after the feeding is finished, the siphon liquid suction port 12 is retracted to between 0 and-Hu, the washing valve 22 is opened, the liquid discharge valve 32 is closed, and the washing liquid is uniformly sprayed on the surface of the filter cake through the washing pipe 1 to wash the filter cake. At the moment, the siphon liquid suction port 12 is higher than the outer side of the filter screen 8, the filtering driving force is small, the filtering speed is low, so that the retention time of the washing liquid in the filter cake layer 10 is prolonged, the filter cake is washed more sufficiently, and the washing liquid is continuously separated and discharged through the siphon 15. Due to the fact thatThe siphon outlet has a certain pressure, and the washing liquid is sent to a backflushing tank 33 through a tee joint 30 and a check valve 31 to be used as backflushing water. When the cake wash is desired, the wash valve 22 is closed, at which time the siphon 15 is brought to the lowest position, so that it is in the optimum dewatering state. After the continuous separation for a period of time, the cake layer 10 is fully dried, the discharging device 5 is started, the scraper 6 reversely rotates to cut into the cake layer 10, the filter cake is scraped by the scraper 6 and discharged out of the machine through the spiral discharging device 3, and then is conveyed to the air flow dryer 20 for drying through the belt conveying device 23, and the scraper 6 resets after the discharging is finished, so that the siphon scraper centrifuge 28 finishes an operation cycle.

The residual filter cake of the siphon scraper centrifuge 28 is automatically removed: residual filter cakes with certain thickness are left on the surface of the filter screen 8 after the scraper centrifuge discharges materials, the residual filter cakes become more compact after being discharged and extruded for many times, and if the residual filter cakes are not processed in time, difficulty in filtration and dehydration can be caused, so that the dehydration time of sodium bicarbonate crystal slurry is prolonged, the production capacity is reduced, the moisture content is higher, and the like. For this purpose, a periodic rinsing function is added in order to completely remove the residual filter cake, so that the filter screen 8 is completely regenerated. The periodic rinse is in a one-touch, fully automatic mode of operation. When rinsing is needed, the rinsing function of the siphon scraper centrifuge 28 is started, the centrifuge is firstly reduced to a certain rotating speed, the siphon tube 15 is withdrawn from the siphon cavity 13 and does not discharge liquid any more, then the spiral discharge hole is switched to a liquid discharge channel through the cleaning liquid switching device 25, then cleaning liquid is added from the washing pipe 1, after a certain amount of cleaning liquid is added, the discharging device 5 and the spiral discharging device 3 are started, when the scraper 6 is about to reach the end position, the residual filter cake is taken up by the cleaning liquid and finally sent to the alkali dissolving tank through the spiral discharging device 3 and the cleaning tank 24, so that the liquid is repeatedly added and the discharging is repeated for several times, the residual filter cake can be thoroughly removed, the filter screen can be completely regenerated, and after the rinsing is completed, the cleaning liquid switching device 25 is reset to a normal discharge channel.

In conclusion, the filtration, washing and dehydration of the sodium bicarbonate crystal slurry in the sodium bicarbonate production process by the trona method can be completed by the siphon scraper centrifuge 28 and the matched device, the moisture content of a filter cake after the filtration, washing and dehydration by the siphon scraper centrifuge 28 is less than or equal to 4 percent, and the NaCl content is less than or equal to 0.4 percent, which is superior to the existing filtration, washing and dehydration methods.

The foregoing is merely an example of the present invention and common general knowledge in the art of specific structures and/or features of the utility model has not been set forth herein in any way. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (10)

1. A filtration, washing, dewatering system for baking soda production characterized in that: the device comprises a carbonation tower, a high-level tank, a washing liquid tank, a backflushing tank and a siphon scraper centrifuge, wherein the carbonation tower is communicated with the high-level tank, the siphon scraper centrifuge comprises a rotary drum, the rotary drum is provided with a centrifugal cavity and a siphon cavity which are communicated, a filter screen is arranged in the centrifugal cavity, a spiral discharging device and a discharging device which extend into the centrifugal cavity are arranged on the outer side of the rotary drum, the high-level tank is connected with an inlet pipe which extends into the centrifugal cavity, the washing liquid tank is connected with a washing pipe which extends into the centrifugal cavity, and the backflushing tank is connected with a siphon pipe and a backflushing pipe which extend into the siphon cavity.

2. A filtration, washing and dehydration system for the production of baking soda according to claim 1 characterized in that: an inner rotary drum is arranged in the centrifugal cavity and is made of a grid screen plate, the inner rotary drum is positioned between the filter screen and the inner wall of the rotary drum, a filter channel is formed between the inner rotary drum and the inner wall of the rotary drum, and the filter channel is communicated with the siphon cavity.

3. A filtration, washing and dehydration system for the production of baking soda according to claim 2 characterized in that: the discharging device is positioned above the feeding end of the spiral discharging device, a scraper with an upward cutting edge is arranged on the discharging device, and the scraper extends into the centrifugal cavity.

4. A filtration, washing and dehydration system for the production of baking soda according to claim 3 characterized in that: the top end of the carbonating tower is communicated with a separator, the bottom end of the separator is provided with a liquid return pipe communicated with the carbonating tower, and the top end of the separator is communicated with an airflow dryer through a pipeline.

5. A filtration, washing and dehydration system for the production of baking soda according to claim 4 characterized in that: the discharge gate of spiral discharging device is equipped with lotion auto-change over device, and lotion auto-change over device's discharge gate below is equipped with belt conveyor, and the belt conveyor outside is equipped with the washing tank, and belt conveyor communicates with air dryer's feed end.

6. A filtration, washing and dehydration system for the production of baking soda according to claim 5 characterized in that: the inlet pipe communicates with the bottom of high-order jar, and the high-end intercommunication of high-order jar has the overflow pipe, and the overflow pipe intercommunication has the alkali dissolving groove.

7. A filtration, washing and dehydration system for the production of baking soda according to claim 6 characterized in that: the backflushing pipe is connected to the middle part of the backflushing tank, the siphon pipe is communicated with the top of the backflushing tank, the upper part of the backflushing tank is provided with an overflow port, the bottom end of the backflushing tank is provided with a discharge port, and the overflow port and the discharge port are both communicated with the alkali dissolving tank.

8. A filtration, washing and dehydration system for the production of baking soda according to claim 7 characterized in that: the siphon is connected with a tee joint, one end of the tee joint is connected with a check valve and communicated with the backflushing tank through a pipeline, and the other end of the tee joint is communicated with the alkali dissolving tank through a liquid discharge valve.

9. A filtration, washing and dehydration system for the production of baking soda according to claim 1 characterized in that: the siphon tube is movable relative to the siphon chamber.

10. A filtration, washing and dehydration system for the production of baking soda according to claim 1 characterized in that: the end part of the feed pipe, which is positioned in the centrifugal cavity, is connected with a fishtail-shaped distributing device.

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