A system for solid-liquid separation

Abstract

The present application relates to the field of chemical equipment, and more particularly to a solid-liquid separation system, comprising a waste lye filtering device, a crystallization kettle and a centrifugal device connected in sequence, wherein the waste lye filtering device comprises a lye tank and a filter residue storage tank, the top of the lye tank is provided with a liquid inlet pipe, and the bottom is provided with a liquid outlet pipe, the filter residue storage tank is arranged in a ring shape on the inner wall of the lye tank, the outer wall of the lye tank is provided with a first residue discharge port at a position corresponding to the filter residue storage tank, the annular middle region of the filter residue storage tank is provided with an annular flexible filter screen, the outer ring of the annular flexible filter screen is fixed with the filter residue storage tank, the inner ring of the annular flexible filter screen is fixed with a flow guide cap, the flow guide cap is connected with a vertical telescopic device, the vertical telescopic device drives the flow guide cap to move up and down, and the lower part of the annular flexible filter screen is provided with a trawl perforated plate, which is fixed on the inner wall of the lye tank. The present application is convenient to operate and greatly improves the treatment efficiency of the alkali-containing wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical equipment, in particular to a solid-liquid separation system. BACKGROUND

[0002] Sodium dichloroquinolinic acid (chemical name: 3,7-dichloroquinoline-8-carboxylic acid sodium) has a series of derivatives in the pesticide herbicide variety, and is an indispensable intermediate in the new antihypertensive drugs, and has very wide application. At present, the domestic sodium dichloroquinolinic acid manufacturers all adopt the nitric acid oxidation production process developed by Shenyang Chemical Research Institute. The industrialized route of the nitric acid oxidation production process of dichloroquinolinic acid is to use 3-chloro-2-methyl aniline and glycerol as raw materials to prepare 7-chloro-8-methyl quinoline, then to perform chlorination reaction on the 7-chloro-8-methyl quinoline with chlorine to generate 3,7-dichloro-8-methyl quinoline chloride, and finally to oxidize the 3,7-dichloro-8-methyl quinoline chloride with concentrated nitric acid in concentrated sulfuric acid to obtain sodium dichloroquinolinic acid.

[0003] In the process of the "neutralization" process, the lower alkali wastewater effluent from the neutralization kettle can be filtered to prepare mirabilite. The catalyst and impurities remaining in the lower alkali wastewater effluent need to be filtered by the suction filtration tank, and the filtered alkali wastewater is pumped into the mirabilite crystallization kettle. Salt water is introduced into the jacket of the mirabilite crystallization kettle to reduce the temperature in the mirabilite crystallization kettle to 0-5 DEG C, and mirabilite crystals are precipitated from the alkali liquor. Then, the mirabilite crystals are discharged to a centrifuge for solid-liquid separation, and mirabilite is obtained by centrifugation. The wastewater flows into the underground tank of the neutralization wastewater. The above-mentioned process equipment has the following problems: the filter cake formed by the catalyst and impurities easily blocks the filter plate in the suction filtration tank, and the filter plate needs to be cleaned frequently. SUMMARY

[0004] Based on the above problems, the purpose of the present application is to provide a solid-liquid separation system. The present application adopts the following technical scheme:

[0005] The present application provides a solid-liquid separation system, which comprises a waste alkali liquor filtering device, a crystallization kettle and a centrifugal equipment connected in sequence. The waste alkali liquor filtering device comprises an alkali liquor tank and a filter residue storage tank. The top of the alkali liquor tank is provided with an inlet pipe, and the bottom is provided with an outlet pipe. The filter residue storage tank is arranged in a ring shape on the inner wall of the alkali liquor tank. A first residue discharge port is formed in the outer wall of the alkali liquor tank at a position corresponding to the filter residue storage tank. A ring-shaped flexible filter screen is arranged in the middle area of the ring-shaped filter residue storage tank. The outer circle of the ring-shaped flexible filter screen is fixed to the filter residue storage tank, and the inner circle of the ring-shaped flexible filter screen is fixed to a flow guide cap. The flow guide cap is connected to a vertical telescopic device. The vertical telescopic device drives the flow guide cap to move up and down. A trawl mesh plate is arranged below the ring-shaped flexible filter screen and is fixed to the inner wall of the alkali liquor tank.

[0006] Preferably, the top of the lye tank is provided with a support pipe, the lower end of the support pipe is arranged in vertical correspondence with the flow guide cap, and one side of the support pipe is connected with the liquid inlet pipe; a drive shaft is arranged in the support pipe, the upper end of the drive shaft is connected with a scraper drive device arranged at the top of the support pipe, the lower end of the drive shaft is connected with a scraper through a transverse support arm, and the scraper is arranged in a residue storage tank; the residue storage tank is in the shape of a circular ring.

[0007] Preferably, the scraper drive device comprises a synchronous belt and a speed reducer motor, a power output shaft of the speed reducer motor and the drive shaft are both provided with synchronous pulleys, and the two synchronous pulleys are connected in power through the synchronous belt.

[0008] Preferably, the drive shaft is a hollow shaft.

[0009] The vertical telescopic device comprises a first telescopic driving member, a linkage rod and a guide slide rod, the first telescopic driving member is arranged at the top of the support pipe, the linkage rod is arranged in the cavity of the drive shaft, the upper end of the linkage rod is connected with the first telescopic driving member, and the lower end is connected with the flow guide cap.

[0010] The guide slide rod is arranged below the flow guide cap, the upper end of the guide slide rod is fixed with the flow guide cap, and the lower end is slidingly connected in a guide slide sleeve, and the guide slide sleeve is fixed on the trawl perforated plate.

[0011] Preferably, a flushing pipe is further arranged in the cavity of the drive shaft, and the bottom of the lye tank is further provided with a residual liquid discharge port.

[0012] Preferably, a negative pressure port is arranged on the lye tank, the negative pressure port is located below the trawl perforated plate, and the negative pressure port is connected with a negative pressure device.

[0013] Preferably, the centrifugal device comprises a shell, the shell is divided into a front residue filtering cavity and a rear filtrate filtering cavity by a partition plate, the bottom of the residue filtering cavity is provided with a second residue discharge port, and the bottom of the filtrate filtering cavity is provided with a liquid discharge port.

[0014] A horizontal rotary drum is arranged in the filtrate filtering cavity, a plurality of filter holes are arranged on the drum wall of the horizontal rotary drum, the rear end of the horizontal rotary drum is connected in power with a rotary drum driving device, a pushing disc is arranged in the horizontal rotary drum, the pushing disc is connected with a discharge port of a feeding mechanism through a pushing disc column, and the feeding mechanism is arranged on a horizontal movement driving device.

[0015] Preferably, a distributing hopper is arranged on the discharge port of the feeding mechanism, and a gap is left between the distributing hopper and the pushing disc.

[0016] Preferably, the feeding mechanism is a screw conveyor.

[0017] Preferably, the transverse movement driving device comprises a slide rail and a sliding block arranged on the slide rail, the sliding block is fixed at the bottom of the feeding mechanism, and the feeding mechanism is provided with a second telescopic driving element on one side.

[0018] Compared with the prior art, the present application has the beneficial technical effects:

[0019] The system for solid-liquid separation of the present application is characterized in that waste alkali liquid is transported into an alkali liquid tank, impurities are filtered through a flexible filter screen arranged during transportation, filter residues are cleaned through tensioning of the flexible filter screen during the filtering process, plugging of the filtering element is avoided, filtering efficiency and filtering effect are ensured, waste liquid after filtering is transported into a crystallization kettle to realize crystallization, and the present application is convenient to operate and greatly improves the treatment efficiency of alkali-containing waste water. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in combination with the description of the drawings.

[0021] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the solid-liquid separation system of the present application;

[0022] Figure 2 FIG. 4 is a schematic diagram of the structure of the waste alkali liquid filtering device of the present application;

[0023] Figure 3 FIG. 6 is a schematic diagram of the structure of the vertical telescopic device of the present application;

[0024] Figure 4 FIG. 8 is a schematic diagram of the structure of the scraper driving device of the present application;

[0025] Figure 5 FIG. 10 is a schematic diagram of the tensioned state of the annular flexible filter screen of the present application;

[0026] Figure 6 FIG. 12 is a schematic diagram of the structure of the centrifugal equipment of the present application.

[0027] Explanation of reference signs: 1, waste lye filtering device; 101, lye tank; 102, filter residue storage tank; 103, liquid inlet pipe; 104, liquid outlet pipe; 105, first residue discharge port; 106, annular flexible filter screen; 107, flow guide cap; 108, vertical telescopic device; 108-1, first telescopic driving part; 108-2, linkage rod; 108-3, guide sliding rod; 108-4, guide sliding sleeve; 109, trawl mesh plate; 110, support pipe; 111, driving shaft; 112, scraper driving device; 112-1, synchronous belt; 112-2, speed reduction motor; 113, horizontal support arm; 114, scraper; 115, flushing pipe; 116, residual liquid discharge port; 117, negative pressure port; 118, negative pressure equipment; 2, crystallization kettle; 3, centrifugal equipment; 301, shell; 302, partition plate; 303, filter residue cavity; 304, filtrate cavity; 305, second residue discharge port; 306, liquid discharge port; 307, horizontal rotary drum; 308, rotary drum driving device; 309, pushing disc; 310, pushing disc column; 311, feeding mechanism; 312, horizontal movement driving device; 312-1, slide rail; 312-2, sliding block; 312-3, second telescopic driving part; 313, distributing hopper. DETAILED DESCRIPTION

[0028] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and examples.

[0029] As shown in the drawings, Figures 1 to 5 A solid-liquid separation system is disclosed in the present embodiment, which comprises a waste lye filtering device 1, a crystallization kettle 2 and a centrifugal equipment 3 connected in sequence.

[0030] The waste lye filtering device 1 comprises a lye tank 101 and a filter residue storage tank 102. The lye tank 101 is provided with a liquid inlet pipe 103 at the top and a liquid outlet pipe 104 at the bottom. The filter residue storage tank 102 is arranged in an annular shape on the inner wall of the lye tank 101 and is fixed to the inner wall of the lye tank 101. The outer wall of the lye tank 101 is provided with a first residue discharge port 105 at a position corresponding to the filter residue storage tank 102. The annular middle region of the filter residue storage tank 102 is provided with an annular flexible filter screen 106. The outer ring of the annular flexible filter screen 106 is fixed to the filter residue storage tank 102, and the inner ring of the annular flexible filter screen 106 is fixed to a flow guide cap 107. Pressure plates are arranged at the inner and outer rings of the annular flexible filter screen 106 and are fixed to the flow guide cap 107 and the filter residue storage tank 102 by bolts.

[0031] The flow guide cap 107 is connected with the vertical telescopic device 108, the vertical telescopic device 108 drives the flow guide cap 107 to ascend and descend, the lower portion of the annular flexible filter screen 106 is provided with the drag net sieve plate 109, the drag net sieve plate 109 can lift the settlement position of the annular flexible filter screen 106, so that the accumulated filter residue does not damage the annular flexible filter screen 106, and the drag net sieve plate 109 is fixed on the inner wall of the lye tank 101.

[0032] The working principle of the present application is that in the process of neutralization, the lower alkali water waste liquid is filtered and then enters the lye tank 101 through the liquid inlet pipe 103, the alkali water waste liquid is dispersed to the groove area formed by the annular flexible filter screen 106 through the flow guide cap 107, the annular flexible filter screen 106 filters the catalyst and impurities in the alkali water waste liquid, the filtrate enters the lower portion of the lye tank 101 and is pumped to the crystallization kettle 2 through the liquid outlet pipe 104 for crystallization.

[0033] When the groove area formed by the annular flexible filter screen 106 accumulates a certain amount of residue impurities, the vertical telescopic device 108 drives the flow guide cap 107 to ascend, the flow guide cap 107 tightens the relaxed annular flexible filter screen 106 in the process of ascending, so that the annular flexible filter screen 106 is in a conical slope state, and the accumulated residue falls into the filter residue storage tank 102.

[0034] In the embodiment, the filter residue storage tank 102 is provided with a scraper 114, the scraper 114 is driven by the scraper driving device to rotate along the filter residue storage tank 102, and then the residue in the storage tank is scraped to the first residue discharge port 105, specifically, a support pipe 110 is fixed at the top of the lye tank 101, the lower end of the support pipe 110 communicates with the lye tank 101, the lower end of the support pipe 110 is arranged in vertical correspondence with the flow guide cap 107, and one side of the support pipe 110 is connected with the liquid inlet pipe 103; the support pipe 110 is provided with a driving shaft 111, the upper portion of the driving shaft 111 is rotatably connected with the support pipe 110 through a bearing assembly, the upper end of the driving shaft 111 is power-connected with the scraper driving device 112 arranged at the top of the support pipe 110, the lower end of the driving shaft 111 is connected with the scraper 114 through a transverse support arm 113, and the scraper 114 is arranged in the filter residue storage tank 102; the filter residue storage tank 102 is in a circular ring shape. In work, the driving shaft 111 moves along the circular ring-shaped filter residue storage tank 102 under the action of the scraper driving device 112, and then the residue in the storage tank is scraped to the first residue discharge port 105.

[0035] In the embodiment, the scraper driving device 112 comprises a synchronous belt 112-1 and a speed reducer motor 112-2, a power output shaft of the speed reducer motor 112-2 and the driving shaft 111 are each provided with a synchronous pulley, and the two synchronous pulleys are power-connected through the synchronous belt 112-1. The speed reducer motor 112-2 is fixedly installed on the outer wall of the support pipe 110 through a motor base.

[0036] In the embodiment, the driving shaft 111 is a hollow shaft; the vertical telescopic device 108 drives the flow guide cap 107 to move up and down through the hollow structure of the driving shaft 111. Specifically, the vertical telescopic device 108 comprises a first telescopic driving member 108-1, a linkage rod 108-2 and a guide slide rod 108-3, the first telescopic driving member 108-1 is fixed at the top of the support pipe 110, the linkage rod 108-2 is arranged in the cavity of the driving shaft 111, the upper end of the linkage rod 108-2 is connected with the first telescopic driving member 108-1, and the lower end is connected with the flow guide cap 107; the first telescopic driving member 108-1 can drive the flow guide cap 107 to ascend and descend through the linkage rod 108-2. The first telescopic driving member 108-1 can specifically adopt an oil cylinder.

[0037] The guide slide rod 108-3 is arranged below the flow guide cap 107, the upper end of the guide slide rod 108-3 is fixed with the flow guide cap 107, and the lower end is slidingly connected in a guide slide sleeve 108-4, and the guide slide sleeve 108-4 is fixed on the trawl hole plate 109.

[0038] In the embodiment, a flushing pipe 115 is further arranged in the cavity of the driving shaft 111, and a residual liquid discharge port 116 is further arranged at the bottom of the alkali tank 101. The position of the residual liquid discharge port 116 is lower than that of the liquid outlet pipe 104. When the flow guide cap 107 drives the annular flexible filter screen 106 to present a conical slope state in the ascending process, the flushing pipe 115 supplies water into the driving shaft 111, the washing water is dispersed to the annular flexible filter screen 106 through the flow guide cap 107, the residues on the filter screen are flushed into the residue storage tank 102, and the residual liquid after the flushing is filtered and falls into the bottom of the alkali tank 101, and can be discharged into the underground tank of neutralized waste water through the residual liquid discharge port 116.

[0039] In the embodiment, a negative pressure port 117 is arranged on the alkali tank 101, the negative pressure port 117 is located below the trawl hole plate 109, and the negative pressure port 117 is connected with a negative pressure equipment 118. When the negative pressure equipment 118 works, the lower part of the alkali tank 101 generates an additional negative pressure effect, and the solution containing impurities is quickly sucked into the alkali tank 101 to filter the material. The negative pressure equipment 118 is usually a vacuum pump.

[0040] As Figure 6As shown, the centrifugal device 3 in the embodiment includes a shell 301, which is divided into a front filter residue cavity 303 and a rear filter liquid cavity 304 by a partition 302, the bottom of the filter residue cavity 303 is provided with a second residue discharge port 305, and the bottom of the filter liquid cavity 304 is provided with a liquid discharge port 306.

[0041] A horizontal rotary drum 307 is arranged in the filter liquid cavity 304, the front end of the horizontal rotary drum 307 is open, the rear end is closed, a plurality of filter holes are arranged on the drum wall of the horizontal rotary drum 307, the rear end of the horizontal rotary drum 307 is power-connected with a rotary drum driving device 308, the rotary drum driving device 308 is a motor in the embodiment, the motor drives the horizontal rotary drum 307 to rotate through a belt and a belt pulley. A pushing disc 309 is arranged in the horizontal rotary drum 307, the pushing disc 309 is connected with a discharge port of a feeding mechanism 311 through a pushing disc column 310, and the feeding mechanism 311 is arranged on a horizontal moving driving device 312. A reserved through hole for facilitating the movement of the feeding mechanism 311 is arranged at the front end position of the shell 301.

[0042] When the centrifugal device 3 works, the mirabilite crystals are precipitated in the crystallization kettle 2, then the mirabilite crystals are discharged into the feeding mechanism 311, due to the rotary motion of the horizontal rotary drum 307, under the action of centrifugal force, the mirabilite crystals flow to the inner wall position of the horizontal rotary drum 307 along the pushing disc 309, under the action of centrifugal force, the water in the mirabilite crystals is filtered out through the filter holes of the horizontal rotary drum 307, the filter liquid is discharged through the liquid discharge port 306, and the mirabilite crystals remain on the inner wall of the horizontal rotary drum 307. Under the axial pushing force of the pushing disc 4, the mirabilite crystal solid material is pushed to the opening of the rotary drum 2, and finally enters the filter residue cavity 303 and is discharged through the second residue discharge port 305. The axial pushing force of the pushing disc 4 comes from the horizontal moving driving device 312.

[0043] In the embodiment, the horizontal moving driving device 312 includes a sliding rail 312-1 and a sliding block 312-2 arranged on the sliding rail 312-1, the sliding block 312-2 is fixed at the bottom of the feeding mechanism 311, one side of the feeding mechanism 311 is provided with a second telescopic driving member 312-3, and the telescopic end of the second telescopic driving member 312-3 is rotationally connected with the feeding mechanism 311. The body of the second telescopic driving member 312-3 is rotationally connected with a rack, and the sliding rail 312-1, the shell 301 and the rotary drum driving device 308 are also fixedly installed on the lower rack. The second telescopic driving member 312-3 can be an oil cylinder.

[0044] In the embodiment, a distributing hopper 313 is fixed on the discharge port of the feeding mechanism 311, and a gap is left between the distributing hopper 313 and the pushing disc 309.

[0045] In the embodiment, the feeding mechanism 311 is a screw conveyor.

[0046] The above described embodiments are only to illustrate the preferred modes of the present application, and are not intended to limit the scope of the present application. Any modification and improvement made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A solid-liquid separation system, comprising a waste alkali solution filtration device (1), a crystallization kettle (2), and a centrifuge (3) connected in sequence, characterized in that: The waste alkali solution filtration device (1) includes an alkali solution tank (101) and a filter residue storage tank (102). The alkali solution tank (101) is provided with an inlet pipe (103) at the top and an outlet pipe (104) at the bottom. The filter residue storage tank (102) is arranged in a ring on the inner wall of the alkali solution tank (101). The outer wall of the alkali solution tank (101) is provided with a first slag discharge port (105) at the position corresponding to the filter residue storage tank (102). An annular flexible filter screen is provided in the annular middle area of ​​the filter residue storage tank (102). (106) The outer ring of the annular flexible filter screen (106) is fixed to the filter residue storage tank (102), the inner ring of the annular flexible filter screen (106) is fixed to the guide cap (107), the guide cap (107) is connected to the vertical telescopic device (108), the vertical telescopic device (108) drives the guide cap (107) to move up and down, and a drag net perforated plate (109) is provided below the annular flexible filter screen (106), the drag net perforated plate (109) is fixed on the inner wall of the alkali tank (101); The top of the alkali tank (101) is provided with a support pipe (110), the lower end of the support pipe (110) and the guide cap (107) are arranged vertically corresponding to each other, and the inlet pipe (103) is connected to one side of the support pipe (110); a drive shaft (111) is provided in the support pipe (110), the upper end of the drive shaft (111) is connected to the scraper drive device (112) provided at the top of the support pipe (110), and the lower end of the drive shaft (111) is connected to the scraper (114) through the horizontal support arm (113). The scraper (114) is provided in the filter residue storage tank (102); the filter residue storage tank (102) is circular. The scraper drive device (112) includes a synchronous belt (112-1) and a geared motor (112-2). The power output shaft of the geared motor (112-2) and the drive shaft (111) are both equipped with synchronous pulleys. The two synchronous pulleys are connected by the synchronous belt (112-1). The drive shaft (111) is a hollow shaft; The vertical telescopic device (108) includes a first telescopic drive member (108-1), a linkage rod (108-2), and a guide rod (108-3). The first telescopic drive member (108-1) is disposed at the top of the support tube (110), and the linkage rod (108-2) is disposed in the cavity of the drive shaft (111). The upper end of the linkage rod (108-2) is connected to the first telescopic drive member (108-1), and the lower end is connected to the guide cap (107). The guide rod (108-3) is located below the flow guide cap (107). The upper end of the guide rod (108-3) is fixed to the flow guide cap (107), and the lower end is slidably connected in the guide sleeve (108-4). The guide sleeve (108-4) is fixed on the trawl plate (109).

2. The solid-liquid separation system according to claim 1, characterized in that: A flushing pipe (115) is also provided in the cavity of the drive shaft (111), and a residual liquid outlet (116) is also provided at the bottom of the alkali tank (101).

3. The solid-liquid separation system according to claim 1, characterized in that: The alkali tank (101) is provided with a negative pressure port (117), which is located below the trawl mesh perforated plate (109) and is connected to a negative pressure device (118).

4. The solid-liquid separation system according to claim 1, characterized in that: The centrifuge (3) includes a housing (301), which is divided into a front filter cake chamber (303) and a rear filtrate chamber (304) by a partition (302). The bottom of the filter cake chamber (303) is provided with a second slag discharge port (305), and the bottom of the filtrate chamber (304) is provided with a filtrate discharge port (306). A horizontal rotating drum (307) is provided in the filtrate chamber (304). Several filter holes are provided on the drum wall of the horizontal rotating drum (307). The rear end of the horizontal rotating drum (307) is poweredly connected to the rotating drum drive device (308). A pusher plate (309) is provided inside the horizontal rotating drum (307). The pusher plate (309) is connected to the discharge port of the feeding mechanism (311) through the pusher plate column (310). The feeding mechanism (311) is set on the transverse drive device (312).

5. The solid-liquid separation system according to claim 4, characterized in that: The feeding mechanism (311) is provided with a feeding hopper (313) at its discharge port, and there is a gap between the feeding hopper (313) and the pusher plate (309).

6. The solid-liquid separation system according to claim 4, characterized in that: The feeding mechanism (311) is a screw conveyor.

7. The solid-liquid separation system according to claim 4, characterized in that: The transverse drive device (312) includes a slide rail (312-1) and a slider (312-2) disposed on the slide rail (312-1). The slider (312-2) is fixed to the bottom of the feeding mechanism (311). A second telescopic drive member (312-3) is disposed on one side of the feeding mechanism (311).

Images