CN216549853U - Three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism - Google Patents

Abstract

The utility model discloses a three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism which comprises a circulation separation device, wherein the circulation separation device comprises a circulation separation cavity, a conical scavenging barrel and a centrifugal barrel butted at the lower end of the conical scavenging barrel are arranged in the circulation separation cavity, the centrifugal barrel and the conical scavenging barrel divide the circulation separation cavity into an inner cavity and an outer cavity, and the outer cavity is sequentially provided with a coarse filtration clapboard, a fine filtration clapboard and a partition board from top to bottom to isolate a primary filtration chamber, a fine filtration chamber, a water passing chamber and a concentrated solution chamber; the feed cylinder is swept to toper is equipped with the water hole of crossing of intercommunication inner chamber and crossing the hydroecium, and the partition panel is located the top of centrifuge drum, and the upper end of feed cylinder is swept to the toper is passed through the upper shaft head and is rotated with the circulation separation chamber and link together, and the lower extreme passes through the lower shaft head and rotates with the circulation separation chamber and link together, and the upper shaft head links together with the rotatory motor of drive toper feed cylinder. The method has the advantage of pretreating the mother liquor, and solves the problems of low treatment efficiency and resource waste of the conventional method.

Description

Three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism

Technical Field

The application relates to the technical field of phenol-containing wastewater treatment equipment, in particular to a three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism.

Background

P-hydroxybenzoic acid, PHBA, is an important organic synthetic material, and due to its unique hydroxyl and carboxyl functional groups, it is one of the most widely used materials in organic chemical raw materials, and is widely used in the fields of medicine, pesticide, food, electronic communication, polymer material industry, etc. In recent years, PHBA is in great demand in domestic and foreign markets. Compared with foreign technologies, the PHBA production process in China is relatively laggard, the operation is complex, the yield is low, the energy consumption is high, and the wastewater production capacity is high. In addition, with the continuous development of society, the demand of related downstream industries on high-purity, low-chroma and high-stability PHBA is increasing. In order to solve the problem of neck clamping in the field of liquid crystal high-molecular materials in China, breakthrough is realized in the direction of high-end electronic chemicals, and the development of a PHBA high-efficiency green synthesis technology becomes an important research content of the PHBA industry in China under the large background of innovation and upgrade and green transformation of the manufacturing industry.

Currently, the PHBA production processes widely adopted in domestic and foreign industries mainly comprise the following three processes:

1. salicylic acid is used as a raw material, is converted into potassium salt by potassium hydroxide, is converted at high temperature in the presence of potassium carbonate, and is acidified to prepare PHBA. Although the process is mature, the salicylic acid is synthesized by carboxylation and then converted into PHBA. The indirect synthesis production method has the advantages of longer production process flow, low yield and high cost.

2. Potassium phenolate or sodium phenolate is used as a raw material, and is subjected to carboxylation reaction with carbon monoxide under the action of formate and under the pressure of 5.88 MPa and at high temperature, so that the PHBA with high yield is obtained. Although the yield of this route is high, the required pressure is high, and therefore the equipment requirements are extremely high. In addition, the process requires continuous production of carbon monoxide gas for carboxylation reaction, and thus the production has a high difficulty.

3. The Kolbe-Schmitt synthesis method is utilized, firstly, phenol and potassium hydroxide are prepared into potassium phenoxide, then the potassium phenoxide is used as a raw material to perform a carboxylation reaction with carbon dioxide in a certain medium under the pressure of 0.49-0.88MPa and the high temperature of 150 ℃ plus 270 ℃, and then the crude product PHBA is obtained by hydrochloric acid precipitation, filtration and drying. The production method has lower reaction pressure, and the used carbon dioxide, potassium hydroxide and phenol have rich sources, thereby being easy to realize industrialization. However, the process is operated intermittently, and the yield is low. In addition, a large amount of waste gas, waste water and solid waste are generated in the process reaction and intermediate treatment process, particularly the generated phenol-containing waste water is difficult to treat, is not beneficial to environmental protection, and simultaneously influences the economic benefit to a certain extent.

The existing sewage generated by PHBA treatment is treated by conveying mother liquor (containing recyclable solid substances) and washing water to corresponding sewage treatment equipment together, so that the waste water treatment efficiency is low and resources are wasted.

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism for pretreating mother liquor, which solves the problems of low treatment efficiency and resource waste of the existing method.

The technical problem is solved by the following technical scheme: a three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism comprises a mother liquid pool and a washing water pool, wherein a circulation separation device is arranged between the mother liquid pool and the washing water pool and comprises a circulation separation cavity, a conical material sweeping cylinder with a closed upper end and an open lower end is arranged in the circulation separation cavity, the upper end of the conical material sweeping cylinder is small, the lower end of the conical material sweeping cylinder is large, a centrifugal cylinder with an open upper end and a closed lower end is butted at the lower end of the conical material sweeping cylinder, the circulation separation cavity is divided into an inner cavity and an outer cavity by the centrifugal cylinder and the conical material sweeping cylinder, the outer cavity is sequentially provided with a coarse filtering partition plate, a fine filtering partition plate and a partition plate from top to bottom, the coarse filtering chamber, the fine filtering chamber, a water filtering chamber and a concentrated liquid chamber are separated from top to bottom in the outer cavity by the coarse filtering partition plate, and the mother liquid pool is communicated with the coarse filtering chamber; the part of the conical sweeping cylinder corresponding to the water passing chamber is provided with a water passing hole communicated with the inner chamber, the inner chamber is communicated with a washing water tank, the partition board is positioned above the centrifugal cylinder, the upper end of the conical sweeping cylinder is rotationally connected with the circulating separation cavity through an upper shaft head, the lower end of the conical sweeping cylinder is rotationally connected with the circulating separation cavity through a lower shaft head, and the upper shaft head is connected with a motor driving the conical sweeping cylinder to rotate.

According to the technical scheme, the mother liquor flows into the washing water tank after being subjected to solid-liquid separation, and then is conveyed away together for treatment, the mother liquor is pretreated, solid matters in the mother liquor can be separated out for recycling, resources are saved, the solid matter content in the subsequently-treated wastewater is low, and the discharging efficiency can be improved. After coarse and fine filtration, centrifugal separation is carried out under the action of a centrifugal cylinder, so that the solid content of the finally flowing water is low, the filtration and concentration of solid wastes with different diameters are realized, and the solid wastes are conveniently discharged from the solid discharge holes of the corresponding chambers in a targeted manner. The sewage passing through the circulating separation device can directly enter a washing water tank for sewage treatment, so that the sewage treatment efficiency is improved; can accomplish the separately processing of the solid residue of phenol-containing waste water and waste water in the PDBA production process through this application, cubic solid-liquid separation accomplishes the solid residue of different particle diameters respectively and clears away, compares traditional centrifuge, and the toper is swept the feed cylinder and is joined in marriage centrifuge bowl of this application and not only can play centrifugal separation's effect, still has the centrifugation many times of circulation to the filterable benefit of layering, the treatment effeciency of the phenol-containing waste water of improvement PHBA production that can be very big.

Preferably, a filter screen is arranged in the inner chamber, the inner chamber is separated into an upper chamber and a lower chamber by the filter screen, the water passing hole is located in the lower chamber, and the washing water tank is communicated with the upper chamber. The solid-liquid separation effect can be further improved, so that the content of solid matters output into the washing tank is small, the filter screen is arranged in an upper output mode, the filter screen at the upper end is not easy to block, and the solid matters after filtering can be centrifuged to the concentrated solution chamber by the centrifugal cylinder.

Preferably, an inner spindle head coaxial with the conical sweeping cylinder is arranged in the lower cavity, the lower end of the inner spindle head is connected with the bottom wall of the centrifugal cylinder, the upper end of the inner spindle head penetrates through the filter screen and then extends into the upper cavity, a liquid flow output channel axially extending along the inner spindle head is arranged in the inner spindle head, a liquid inlet communicated with the liquid flow output channel is formed in the part of the inner spindle head located in the upper cavity, the lower end of the liquid flow output channel extends into the lower spindle head and penetrates through the lower end face of the lower spindle head to form a liquid outlet, and the washing water tank is communicated with the liquid outlet. Layout output can be performed conveniently.

Preferably, the conical material sweeping cylinder is provided with a first material sweeping plate matched with the upper side of the primary filter plate and a second material sweeping plate matched with the upper side of the fine filter partition plate, the coarse filtering partition plate is provided with a plurality of strip-shaped coarse filtering grooves which are distributed on the coarse filtering partition plate in a circumferential array with the conical material sweeping barrel as the center, the fine filter baffle is provided with a plurality of strip-shaped fine filter grooves, the fine filter grooves are distributed on the fine filter baffle in a circumferential array way by taking the conical material sweeping barrel as the center, the coarse filter grooves and the fine filter grooves are straight grooves, the extension direction of the coarse filter grooves is crossed with the radial direction of the primary filter baffle, the extension direction of the fine filter grooves is crossed with the radial direction of the fine filter baffle, the shape of first scanning board and second scanning board is the ring shape that extends along toper scanning feed cylinder circumference, is equipped with on the first scanning board and supplies the material to pass through and get into a plurality of first scanning board portion unloading groove of coarse filtration groove, is equipped with on the second scanning board and supplies the material to pass through and get into a plurality of second scanning board portion unloading groove of fine filtration groove. The arrangement of the first and second material sweeping plates can prevent the coarse filter tank and the fine filter tank from being blocked, and the reliability of the circulating separation device is improved; and the first and second sweeping plates are arranged so that the conical sweeping cylinder also has the function of pushing sewage to flow downwards, and the material driving function is formed when the first and second sweeping plates rotate around the supporting rotating shaft. The filtering capacity of first baffle and second baffle can be guaranteed to the even setting respectively of coarse filter tank and thin filter tank, and the slope setting of coarse filter tank and thin filter tank can improve stifled ability between them to because the slope setting of coarse filter tank and thin filter tank, first scanning board and second are swept the flitch and are difficult to take place to collide with when sliding on first baffle and second baffle, can improve first scanning board and second and sweep the material reliability of sweeping of flitch. The first material sweeping plate and the second material sweeping plate which are arranged in a circular ring shape have high rotation stability, when the first material sweeping plate and the second material sweeping plate rotate along with the conical material sweeping barrel, the feeding grooves are communicated with the upper layer and the lower layer when rotating to the position opposite to the coarse filter tank or the fine filter tank, so that the centrifugal filtering effect is achieved, and the multi-group feeding grooves are cooperated to ensure the reliability of the filtering effect.

Preferably, the feeding trough of the first scanning plate part is positioned at one end of the first scanning plate connected with the conical scanning barrel, and the feeding trough of the second scanning plate part is positioned at one end of the second scanning plate connected with the conical scanning barrel. When the feed cylinder rotates is swept along with the toper to first sweeping board and second, because the centrifugal action that the rotation produced, the great residue of size and quality is got rid of the outer end that first sweeping board and second swept the flitch, and the unloading trench is located the inner that first sweeping board and second swept the flitch, consequently can guarantee that the residue of relative thinness can filter the next floor, prevents that big volume's residue from blockking up unloading silo or coarse filter tank and fine filter tank, improves the filtering action.

Preferably, the first scanning plate is provided with a first scanning plate part sweeping baffle plate, and the first scanning plate part sweeping baffle plate is positioned on one side of the discharging chute along the circumferential direction of the conical sweeping cylinder; the second sweeping baffle is arranged on the second sweeping plate and located on one side of the lower trough along the circumferential direction of the conical sweeping cylinder. The feeding effect can be improved.

Preferably, an upper return pipeline is arranged between the coarse filtration chamber and the fine filtration chamber, and two ends of the upper return pipeline are respectively connected to the upper end of the coarse filtration chamber and the upper end of the fine filtration chamber; and a lower backflow pipeline is arranged between the fine filtering chamber and the water passing chamber, and two ends of the lower backflow pipeline are respectively connected to the upper end of the fine filtering chamber and the upper end of the water passing chamber. The arrangement of the backflow pipeline can realize multiple times of circulating filtration of wastewater, the backflow pipeline is arranged at the upper ends of the coarse filter layer and the fine filter layer, solid impurities are less accumulated, and the reliability of the circulating filtration effect is ensured. The drive power of backward flow effect is for sweeping the feed cylinder centrifugal drive effect under and producing at the toper, need not to set up the power supply in addition, can put up the pressure differential of high coarse filtration baffle and fine filtration baffle business turn over side, and the upper end filters more high-efficiently.

Preferably, the lower ends of the primary filtering chamber, the fine filtering chamber and the water passing chamber are provided with sewage draining holes. The solid matter can be easily discharged.

The utility model has the following beneficial effects: can accomplish the separately processing of the solid residue of containing phenol waste water and waste water in the PDBA production process, the coarse filtration, carefully strain and centrifugation, accomplish the solid residue of different particle diameters respectively and clear away, compare traditional centrifuge, the toper of this application is swept feed cylinder cooperation centrifugal vane and is not only can be played centrifugal separation's effect, still has the centrifugation many times of circulation to the filterable benefit of layering, the treatment effeciency of the containing phenol waste water of improvement PHBA production that can be very big.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the first scanner plate of FIG. 1;

fig. 3 is a plan view of the coarse filter screen in fig. 1.

In the figure: the device comprises a mother liquor pool 1, a washing pool 2, a circulating separation cavity 3, a conical scavenging barrel 4, a centrifugal barrel 5, a rough filtering partition plate 6, a fine filtering partition plate 7, a partition plate 8, a primary filtering chamber 9, a fine filtering chamber 10, a water passing chamber 11, a concentrated solution chamber 12, a discharge hole 13, a water passing hole 14, an upper spindle nose 15, a lower spindle nose 16, a motor 17, a filter screen 18, an upper cavity 19, a lower cavity 20, an inner spindle nose 21, a liquid flow output channel 22, a liquid inlet 23, a liquid outlet 24, a first scavenging plate 25, a second scavenging plate 26, a rough filtering groove 27, a fine filtering groove 28, a first scavenging plate part blanking groove 30, a second scavenging plate part blanking groove 32, a first scavenging plate part scavenging baffle 33, a second scavenging plate part scavenging baffle 34, an upper return pipeline 35 and a lower return pipeline 36.

Detailed Description

The utility model is further illustrated with reference to the figures and the specific embodiments.

Referring to fig. 1 to 3, a three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism comprises a mother liquor pool 1 and a washing pool 2, wherein a circulation separation device is arranged between the mother liquor pool and the washing pool. Circulation separator includes circulation separation chamber 3, be equipped with the toper that the lower extreme open-ended is sealed to the upper end in the circulation separation chamber and sweep feed cylinder 4, the toper is swept the little lower extreme in feed cylinder upper end and is big, the toper is swept feed cylinder lower extreme and is docked has upper end opening lower extreme confined centrifuge bowl 5, centrifuge bowl and toper are swept the feed cylinder and are divided into inner chamber and exocoel with circulation separation chamber, exocoel from the top down is equipped with coarse filtration baffle 6 in proper order, fine filtration baffle 7 and partition panel 8, coarse filtration baffle, fine filtration baffle and partition panel keep apart out the primary filter chamber 9 that distributes from the top down in proper order at the exocoel, fine filter chamber 10, water passing chamber 11 and dense fluid chamber 12. The lower ends of the primary filtering chamber, the fine filtering chamber, the water passing chamber and the concentrated solution chamber are all provided with discharge holes 13, and the mother solution water tank is communicated with the coarse filtering chamber and is provided with a valve control. The part of the conical scavenging cylinder corresponding to the water passing chamber is provided with a water passing hole 14 communicated with the inner chamber, and the inner chamber is communicated with the washing water tank and is provided with a control valve. The partition board is located above the centrifugal cylinder, the upper end of the conical material sweeping cylinder is rotationally connected with the circulating separation cavity through an upper shaft head 15, the lower end of the conical material sweeping cylinder is rotationally connected with the circulating separation cavity through a lower shaft head 16, and the upper shaft head is connected with a motor 17 for driving the conical material sweeping cylinder to rotate. A filter screen 18 is arranged in the inner chamber, the filter screen separates the inner chamber into an upper chamber 19 and a lower chamber 20, and a water passing hole is positioned in the lower chamber. The washing water tank is communicated with the upper cavity, and specifically: an inner shaft head 21 which is coaxial with the conical sweeping cylinder is arranged in the lower cavity, the lower end of the inner shaft head is connected with the bottom wall of the centrifugal cylinder, the upper end of the inner shaft head penetrates through the filter screen and then extends into the upper cavity, a liquid flow output channel 22 which axially extends along the inner shaft head is arranged in the inner shaft head, a liquid inlet 23 which is communicated with the liquid flow output channel is arranged at the part of the inner shaft head which is positioned in the upper cavity, the lower end of the liquid flow output channel extends into the lower shaft head and penetrates through the lower end surface of the lower shaft head to form a liquid outlet 24, and the washing pool is communicated with the liquid outlet. The conical material sweeping cylinder is provided with a first material sweeping plate 25 matched with the upper side of the primary filtering plate and a second material sweeping plate 26 matched with the upper side of the fine filtering plate, the coarse filtering tank is provided with a plurality of long-strip-shaped coarse filtering grooves 27, the coarse filtering grooves are distributed on the coarse filtering plate in a circumferential array mode by taking the conical material sweeping cylinder as a center, the fine filtering plate is provided with a plurality of long-strip-shaped fine filtering grooves 28, the fine filtering grooves are distributed on the fine filtering plate in a circumferential array mode by taking the conical material sweeping cylinder as a center, the coarse filtering grooves and the fine filtering grooves are straight grooves, the extending direction of the coarse filtering grooves is crossed with the radial direction of the primary filtering plate, the extending direction of the fine filtering grooves is crossed with the radial direction of the fine filtering plate, the shapes of the first material sweeping plate and the second material sweeping plate are circular rings extending along the circumferential direction of the conical material sweeping cylinder, the first material sweeping plate is provided with a plurality of first material sweeping grooves 30 for materials to pass through and enter the coarse filtering grooves, and the second material sweeping grooves 32 for materials to pass through and enter the fine filtering grooves are arranged on the second material sweeping plate. The feeding groove of the first material sweeping plate part is located at one end, connected with the conical material sweeping barrel, of the first material sweeping plate, and the feeding groove of the second material sweeping plate part is located at one end, connected with the conical material sweeping barrel, of the second material sweeping plate. A first scanning plate part sweeping baffle 33 is arranged on the first scanning plate and is positioned on one side of the discharging chute along the circumferential direction of the conical sweeping barrel; the second sweeping baffle 34 is arranged on the second sweeping plate and located on one side of the lower trough along the circumferential direction of the conical sweeping cylinder. An upper return pipeline 35 is arranged between the coarse filtration chamber and the fine filtration chamber, and two ends of the upper return pipeline are respectively connected with the upper end of the coarse filtration chamber and the upper end of the fine filtration chamber; a lower return pipeline 36 is arranged between the fine filtering chamber and the water passing chamber, and two ends of the lower return pipeline are respectively connected with the upper end of the fine filtering chamber and the upper end of the water passing chamber.

When the device is used, the waste water in the mother liquor pool 1 is conveyed to the interior of the circulating filter device from the rough filter chamber. It should be noted that, in the drawings of the specification, the groove widths of the coarse filter groove, the fine filter groove and the blanking groove, the thickness and the size of the first scanning plate, the second scanning plate and the cylindrical ring plate, etc. are shown by exaggerated drawing for convenience, and the actual size is far smaller than that in the drawings. After the wastewater enters the circulating separation device, the main flow path of the mother liquor wastewater is large-particle solid residues which are blocked in a coarse filtration layer by a coarse filtration clapboard, the small-size solid residues and the wastewater flow into a fine filtration chamber, the wastewater flows into a lower cavity from a water passing chamber after being filtered again, the solids enter a concentrated solution chamber under the action of a centrifugal cylinder, and the liquid enters an upper cavity through a filter screen, so that the wastewater which is finally positioned in the upper cavity and has less solid residues and no large-size solid residues flows into a washing water tank for treatment. Besides the main flow path, a circulation separation path actually exists, the circulation path comprises a centrifugal force generated by rotation of the conical sweeping cylinder, a first circulation path which is formed by matching an upper return pipeline and a lower return pipeline and is used for enabling waste water in the fine filtering chamber to flow back into the coarse filtering chamber, a second circulation path which is formed by matching the waste water in the water passing chamber and is used for enabling the waste water in the fine filtering chamber to flow back into the fine filtering chamber, and a third circulation path which is used for enabling solid residues thrown out to the concentrated solution chamber under the action of the centrifugal cylinder, the matching of the coarse filtering partition plate and the first sweeping plate and the matching of the fine filtering partition plate and the second sweeping plate can also play a role in grinding the broken slag, the size of the solid residues is reduced, the subsequent waste water treatment is facilitated, and the efficiency of the subsequent waste water treatment can be improved.

Claims (8)

1. A three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism is characterized by comprising a mother liquid pool and a washing water pool, wherein a circulation separation device is arranged between the mother liquid pool and the washing water pool and comprises a circulation separation cavity, a conical sweeping cylinder with a closed upper end and an open lower end is arranged in the circulation separation cavity, the upper end of the conical sweeping cylinder is small, the lower end of the conical sweeping cylinder is large, the lower end of the conical sweeping cylinder is in butt joint with a centrifugal cylinder with an open upper end and a closed lower end, the circulation separation cavity is divided into an inner cavity and an outer cavity by the centrifugal cylinder and the conical sweeping cylinder, the outer cavity is sequentially provided with a rough filtering partition plate, a fine filtering partition plate and a partition plate from top to bottom, the rough filtering chamber, the fine filtering chamber, a water passing chamber and a concentrated liquid chamber are separated by the rough filtering partition plate, the fine filtering partition plate and the partition plate in the outer cavity, and the mother liquid pool is communicated with the rough filtering chamber; the part of the conical sweeping cylinder corresponding to the water passing chamber is provided with a water passing hole communicated with the inner chamber, the inner chamber is communicated with a washing water pool, the partition plate is positioned above the centrifugal cylinder, the upper end of the conical sweeping cylinder is rotationally connected with the circulating separation cavity through an upper shaft head, the lower end of the conical sweeping cylinder is rotationally connected with the circulating separation cavity through a lower shaft head, and the upper shaft head is connected with a motor driving the conical sweeping cylinder to rotate.

2. The three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism according to claim 1, wherein a filter screen is arranged in the inner chamber, the filter screen separates the inner chamber into an upper chamber and a lower chamber, the water through hole is located in the lower chamber, and the washing water tank is communicated with the upper chamber.

3. The three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism according to claim 2, wherein an inner spindle head coaxial with the conical sweeping cylinder is arranged in the lower chamber, the lower end of the inner spindle head is connected with the bottom wall of the centrifugal cylinder, the upper end of the inner spindle head passes through the filter screen and then extends into the upper chamber, a liquid flow output channel axially extending along the inner spindle head is arranged in the inner spindle head, a liquid inlet communicated with the liquid flow output channel is arranged in the part of the inner spindle head located in the upper chamber, the lower end of the liquid flow output channel extends into the lower spindle head and penetrates through the lower end face of the lower spindle head to form a liquid outlet, and a washing water tank is communicated with the liquid outlet.

4. The three-stage separation type p-hydroxybenzoic acid production wastewater treatment mechanism according to claim 1, wherein the conical material-sweeping cylinder is provided with a first material-sweeping plate fitted on the upper side of the primary filter plate and a second material-sweeping plate fitted on the upper side of the fine filter plate, the primary filter plate is provided with a plurality of strip-shaped coarse filter cells, the coarse filter cells are distributed on the coarse filter plate in a circumferential array centered on the conical material-sweeping cylinder, the fine filter plate is provided with a plurality of strip-shaped fine filter cells, the fine filter cells are distributed on the fine filter plate in a circumferential array centered on the conical material-sweeping cylinder, the coarse filter cells and the fine filter cells are straight cells, the extension direction of the coarse filter cells intersects with the radial direction of the primary filter plate, the extension direction of the fine filter cells intersects with the radial direction of the fine filter plate, the first material-sweeping plate and the second material-sweeping plate are both in the shape of a circular ring extending along the circumferential direction of the conical material-sweeping cylinder, the first material-sweeping plate is provided with a plurality of first material-sweeping grooves for the coarse filter cells to pass through, the second sweeping plate is provided with a plurality of discharging grooves at the second sweeping plate part for the materials to pass through and enter the fine filter tank.

5. The three-stage separation type p-hydroxybenzoic acid production wastewater treatment mechanism according to claim 4, wherein the first sweeping plate discharging chute is located at the end where the first sweeping plate is connected to the tapered sweeping cylinder, and the second sweeping plate discharging chute is located at the end where the second sweeping plate is connected to the tapered sweeping cylinder.

6. The three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism according to claim 4 or 5, wherein the first sweeping plate is provided with a first sweeping plate sweeping baffle, the first sweeping plate sweeping baffle is positioned at one side of the blanking chute along the circumferential direction of the tapered sweeping cylinder; the second sweeping baffle is arranged on the second sweeping plate and located on one side of the lower trough along the circumferential direction of the conical sweeping cylinder.

7. The three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism according to claim 1, wherein an upper return pipe is arranged between the coarse filtration chamber and the fine filtration chamber, and both ends of the upper return pipe are connected to the upper end of the coarse filtration chamber and the upper end of the fine filtration chamber respectively; and a lower backflow pipeline is arranged between the fine filtering chamber and the water passing chamber, and two ends of the lower backflow pipeline are respectively connected to the upper end of the fine filtering chamber and the upper end of the water passing chamber.

8. The three-stage separation type p-hydroxybenzoic acid production sewage treatment mechanism according to claim 1, wherein the lower ends of the primary filtration chamber, the fine filtration chamber and the water passing chamber are provided with discharge holes.

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