CN110759446A

CN110759446A - Tail water environment-friendly treatment system and treatment process

Info

Publication number: CN110759446A
Application number: CN201911159504.7A
Authority: CN
Inventors: 乔素钦
Original assignee: Sichuan Yiqin Dahongxin Environmental Protection Technology Co Ltd
Current assignee: Sichuan Yiqin Dahongxin Environmental Protection Technology Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-07

Abstract

The invention discloses a tail water environment-friendly treatment system and a treatment process, wherein the system comprises a tail water pretreatment unit, a dense water separation unit, a dehydration and cake making unit and an operation control unit; the tail water treatment by adopting the system comprises the following steps: 1) tail water to be treated enters a tail water pretreatment unit, so that a large amount of solid-phase substances are removed, equipment configuration of a downstream working section is reduced, and the running cost is reduced; 2) the tail water enters a dense water separation unit to realize the separation of coarse and fine solid in the tail water to obtain coarse-grained slurry and fine-grained tail water, and the fine-grained tail water is subjected to dosing flocculation to prepare clear water for recycling; 3) the coarse-grained slurry enters a dehydration cake-making unit, and the slurry is pumped to a filter through a pipeline to produce a low-content cement cake; the operation control unit works when tail water enters the system, the center console adjusts each unit to a specified parameter value, and the system enters a normal operation state. The invention greatly improves the environmental protection level of tail water treatment and greatly reduces the treatment cost.

Description

Tail water environment-friendly treatment system and treatment process

Technical Field

The invention relates to the technical field of environmental protection, in particular to a tail water environment-friendly treatment system and a treatment process, which are suitable for environment-friendly treatment of mine ore dressing tail water, sand and stone washing tail water, river treatment tail water, chemical production tail water and urban and rural domestic tail water.

Background

In mine ore dressing, sand and stone production, river treatment, chemical production and urban and rural life, a large amount of production tail water, namely sewage (waste water) containing solid and ionic compounds is inevitably generated, and the method is shown to be complex in physicochemical property, high in treatment difficulty and high in treatment cost, and is one of important sources of domestic environmental hazards at present. Meanwhile, the existing traditional process schemes have the problems of residual medicament harm, mud cake and mud secondary pollution harm, high treatment cost and the like which are not overcome to different degrees.

At present, various technical schemes in China are various and are basically divided into three categories: (1) a technical scheme of a rake thickener and a tailing pond; (2) the technical proposal of the deep cone thickener and the belt filter press/plate frame filter; (3) the technical scheme of the multistage sedimentation tank and the belt filter press/plate and frame filter.

Specifically, the scheme of the rake thickener and the tailings pond is as follows: the scheme is widely applied to treatment of mine ore dressing tail water and sand washing tail water, and the flow is as follows: tail water and flocculating agent enter a rake thickener, and solid-liquid separation is carried out after precipitation; and the overflow is used for producing clear water for recycling, and the underflow (high-concentration slurry) is sent to a tailing pond for stockpiling management. The main defects are as follows: a. the occupied area is as follows: the system occupies a large area and the tailing pond occupies a large area; b. construction cost: the system cost + the tailing pond cost + the land acquisition and renting + the forest seedling compensation fee + the safety assessment and environmental assessment fee, so the cost is high; c. environmental protection hidden danger: the hidden environmental problems of medicament residue and particle dust emission are great; d. potential safety hazard: secondary geological disasters or hidden dangers cause a great number of dam break cases in China; e. the production cost is as follows: investment expropriation and amortization, system operation cost, clean water return, later-period management cost and high treatment cost.

The scheme of the deep cone dense barrel and the plate frame/belt type filter press comprises the following processes: tail water and flocculating agent are sent into a deep cone thickening barrel, and tail solids are reacted with the flocculating agent for crystallization and then are subjected to solid-liquid separation; and overflowing and returning clear water containing the medicament, and conveying the tail solid flocculating constituent to a plate frame/belt filter press for dewatering and cake making. The main defects are as follows: a. environmental protection hidden danger: a large amount of medicament is left in mud cakes and backwater, and the backwater pollutes products; b. the production cost is as follows: the investment expropriation and amortization, the system running cost, the clear water return and the later management cost, particularly the medicament production cost account for a large proportion; c. production capacity: limited, not suitable for large scale treatment of tail water; d. the manufacturing cost in the same proportion: because the capacity is limited, the cost is higher than the same ratio.

The scheme of the multistage sedimentation tank and the plate frame/belt type filter press is as follows: at present, the proposal is more common in the treatment of sand and stone washing tail water, chemical production tail water, livestock breeding tail water and aquaculture tail water. The principle is as follows: the flocculating agent is accompanied with the tail water sedimentation tank group, and the solid phase is settled step by step after flocculation, the flocculating constituent in the first and second-stage tanks is pumped to the filter by the submersible pump for dewatering and cake making, and the superfine grain is settled at the bottom of each later-stage tank (in a thick state) and is cleaned regularly by an excavator or other equipment. The main defects are as follows: a. environmental protection hidden danger: the potential hazard of residual medicament in mud cakes and backwater exists, and the backwater utilizes polluted products; b. the production cost is as follows: the medicament cost, the system operation cost and the sludge removal cost are high; c. production capacity: limited, not suitable for large scale treatment of tail water; d. the manufacturing cost in the same proportion: the production capacity is limited, and the cost is higher than the same ratio; e. difficulty in micro-curing treatment: because the sediment step by step, the tail that leads to output after the second grade sediment is solid is high concentration mud form, generally adopts excavator clearance, tank car outward transportation, and mud cake transportation, stockpiling all have serious environmental protection hidden danger, and the treatment cost is on the high side.

Therefore, how to provide an environmental protection treatment system for tail water, which fundamentally solves the above problems, improves the environmental protection level of tail water treatment and greatly reduces the treatment cost is a problem that needs to be solved urgently by technical personnel in the field.

Disclosure of Invention

In view of the above, one of the objectives of the present invention is to provide an environmental protection treatment system for tail water, which comprises a tail water pretreatment unit, a dense water separation unit, a dewatering and cake making unit, a clean water returning unit, and an operation control unit. The invention can realize solid-liquid separation, solid dehydration and clear water recycling of various tail water under the conditions of normal temperature, normal pressure and no medicament (or trace amount); is a basic device for environmental protection treatment, purification and discharge and clean water reuse of industrial and other various industrial and domestic tail water and waste water.

In order to achieve the purpose, the invention adopts the following technical scheme:

a tail water environmental protection treatment system comprises a tail water pretreatment unit, a dense water separation unit, a dehydration and cake making unit and an operation control unit;

the tail water pretreatment unit comprises a precipitation tank, a spiral auger transmission mechanism, a belt conveyor and a tail water conveying pump; the spiral auger transmission mechanism is arranged in the precipitation tank; the belt conveyor is arranged below a discharge port of the spiral auger transmission mechanism; the tail water delivery pump is arranged at the bottom of the settling tank, the inlet end of the tail water delivery pump is communicated with the settling tank, and the outlet end of the tail water delivery pump is connected with a tail water delivery pipe;

the dense water separation unit comprises a cyclone group, an interference settling group and a medicament group; the cyclone group includes: tail water shunt tank, shunt pipe, grading cyclone and separating cyclone; the water inlet direction of the tail water diversion tank is communicated with the tail water conveying pipe, and the water outlet direction of the tail water diversion tank is communicated with the grading cyclone through the diversion pipe; the outer wall of the grading cyclone is provided with an overflow groove; the separation cyclone and the grading cyclone are identical in structure and both communicated with a mud pit;

the interference settling group comprises a clean water tank, a clean water pump, a water distribution tank and an annular water distribution pipe; the clean water tank is communicated with the water distribution tank through the clean water pump; the water distribution tank is communicated with the annular water distribution pipe; the annular water distribution pipe is arranged inside the grading cyclone;

the medicament group comprises a medicament stirring barrel, a diluent medicament tank and a medicament pump; the medicament stirring barrel is communicated with the dilute medicament tank; the diluted medicament release tank is communicated with the lifting medicament mixing stirrer through the medicament pump; the water inlet direction of the lifting agent stirrer is communicated with the overflow groove, and the water outlet direction of the lifting agent stirrer is communicated with the separation cyclone;

the dehydration cake making unit comprises a high-pressure slurry pump and a filter; the filter is communicated with the mud tank through the high-pressure mud pump;

the operation control unit comprises a center console, and the center console is electrically connected with the video signal device, the power signal device and the prompt warning signal device.

Preferably, a plurality of flow stabilizing sieves are arranged on the inner wall of the grading cyclone, and the flow stabilizing sieves are assembled and welded by angle steel and screen meshes.

Preferably, the filter comprises a box filter or a vacuum disc filter; and a mud cake dropping port is arranged below the filter.

Preferably, the dewatering and cake-making unit further comprises a water collecting tank, and the water inlet end of the water collecting tank is communicated with the water outlet of the filter; and the water outlet end of the water collecting tank is respectively communicated with the clean water tank and the overflow tank.

Preferably, a clean water tank and a water suction pump in the interference settling group form a clean water returning unit, and the clean water tank is communicated with a water supply pipeline through the water suction pump; and water in the clean water tank enters the precipitation tank through the clean water pump or enters the water supply line through the water suction pump.

The invention also aims to provide a tail water treatment process adopting the tail water environment-friendly treatment system.

a tail water treatment process adopts the tail water environment-friendly treatment system for treatment, and comprises the following steps:

1) tail water to be treated enters a precipitation tank, water is gradually filled and heightened, coarse-grained solid matters are settled to the bottom of the tank, and fine-grained solid matters overflow to an overflow tank along with the water; simultaneously starting the spiral auger and the belt conveyor to rotate, scraping and dehydrating the precipitate by the spiral auger, and falling the precipitate onto a belt of the belt conveyor to produce low-moisture fine-grained dehydrated sand which is transported and stockpiled; when the water level of the overflow pool reaches a certain height, a tail water delivery pump is started, and tail water is delivered into a dense water separation unit through a delivery pipe;

2) tail water from a tail water delivery pump enters a tail water shunt tank, and due to the action of fall, the tail water is injected into the grading cyclone through a shunt pipe and pushes a water body to rotate at a high speed to generate centrifugal force;

under the action of centrifugal force, coarse-grained solids in tail water are thrown to the inner wall of the grading cyclone, and descend to the bottom along the inner wall under the action of compound hybrid forces such as self weight, centrifugal force and the like to be discharged to a slurry tank; fine particle fractions in tail water go up to an upper opening of the grading cyclone along with a central water column of the rotation of the grading cyclone, overflow and are discharged, and the tail water is collected by an overflow groove and then is sent into a lifting medicine mixing stirrer;

after entering a lifting medicine mixing stirrer, tail water containing micro-fine particles is lifted to a water outlet by a high-speed rotating spiral, is injected into a separation cyclone through a pipeline, and pushes water to rotate under the action of drop height; in the process, tail water containing micro solids is mixed with a flocculating agent pumped by the agent pump, and a flocculation reaction is rapidly generated, and tail water containing the ultramicro solids or argillization substances rapidly generates flocculating constituents and clear water;

the flocculating constituent descends along the inner wall of the separating cyclone under the action of centrifugal force, and high-concentration flocculated slurry is discharged into a slurry tank; clear water goes upward along with a central water column of the cyclone to an upper opening to be discharged in an overflowing way and is sent into a clear water tank through an overflow groove to be recycled;

3) starting a high-pressure slurry pump, conveying the slurry to a filter under pressure through a pipeline, dropping, accumulating and transporting low-water-content slurry cakes, and outputting clear water or muddy water to a water collecting tank;

the operation control unit works when tail water enters the system, the central console adjusts each unit to a specified parameter value according to the video signal, the power signal and the prompt warning signal, and the system enters a normal operation state; when the tail water stops being conveyed, the stop button is pressed through the center console, and the power supply is cut off.

Preferably, the settling velocity of the solid in the tail water entering the classification cyclone in the step 2) is limited by the concentration of the solid, and the settling velocity is high when the concentration is low, and is low otherwise; clear water in the clear water tank is introduced into the water distribution tank through the clear water pump, and the clear water enters the grading cyclone through the water distribution tank and the annular water distribution pipe, so that the concentration of tail water is manually adjusted, the sedimentation of solids is accelerated, and the overflow particle size of the solids in the tail water is disturbed.

Preferably, when clear water is produced in the step 3), the clear water enters a clear water pool for recycling; when the filtered muddy water is produced, the muddy water returns to the overflow tank through the pipeline.

Preferably, the clean water returning unit returns the clean water produced by the system to the water supply line for recycling.

According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. pretreatment: by adopting a YLF series pretreatment machine (hydraulic spiral classifier), the operation amount of subsequent working sections can be greatly reduced after impurities and fine and particulate solid matters in tail water are removed (220 meshes of-180), namely the equipment investment of the system is reduced.

2. Concentrating and separating water: under the conditions of normal temperature, normal pressure and no medicament (or trace amount), the solid-liquid separation of tail water is realized, and clear water and high-concentration slurry are obtained.

3. And (3) dehydrating the slurry: the filtering equipment of the system has strong compatibility, and a vacuum filter, a box type filter and a belt type filter can be selected and configured according to the characteristics of tail water, so that low-content cement cakes can be produced.

4. Recycling tail water: the produced clear water is completely returned to the water supply system for reuse, thereby saving water resources.

5. Construction cost: compared with the traditional technical scheme, the system is dense, flocculation dehydration and comprises a plurality of grading and separating cyclones and box type filters, and has no tall buildings and large-scale civil engineering, short installation period (no more than 25 days), so that the system has obvious construction cost advantage.

6. The running cost is as follows: the system almost has no moving parts (except a motor), and the electric load installation is only 30-50% of that of the traditional technical scheme; the whole process is free from adding chemicals or adding trace chemicals (containing micro solid-400 mesh parts) into partial tail water; the running cost advantage is obvious.

7. And (3) building and occupying: the occupied area of the whole system construction is not more than 1 percent of the traditional rake thickener and tailing pond dehydration technical scheme.

8. And (3) operation control: by adopting the holographic visual/remote operation system, the labor intensity can be greatly reduced, the operation efficiency is improved, the field open-air operation of workers is avoided, and the problem of periodical dredging of the machine is fundamentally solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic process flow diagram of the present invention;

FIG. 2 is a schematic view of the tail water environmental protection treatment system of the present invention;

FIG. 3 is a top view of the tail water environmental protection abatement system of the present invention.

Wherein, in the figure,

1-a belt conveyor; 4-water conveying pipe; 5-an overflow tank; 6-tail water conveying pipe; 7-an overflow pipe; 8-an overflow trough; 9-a shunt tube; 10-tail water diversion tank; 11-steady flow sieve; 12-a water separation tank; 13-annular water diversion pipe; 14-lifting the medicine stirring machine; 15-high pressure mud pipe; 16-a separating cyclone; 17-box filter; 19-a medicament stirring barrel; 20-a clean water tank; 21-a clean water pump; 22-a spiral auger; 23-a precipitation tank; 24-tail water delivery pump; 25-a first pump sump; 26-a classifying cyclone; 27-underflow gate valve; 28-a mud pit; 29-high pressure mud pumps; 30-a second pump sump; 33-a platform; 35-a medicament pump; 36-diluent canister; 37-a medicament tube; 45-water collecting tank; 48-a first gate valve; 50-second gate valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

as shown in figures 1-3, the invention comprises a tail water pretreatment unit, a dense water separation unit, a dehydration and cake making unit, a clear water returning unit and an operation control unit.

1. Tail water pretreatment unit:

(1) the system functions are as follows: sundries such as wood shavings and the like in the tail water are removed, and the stable operation of the system is guaranteed; meanwhile, a large amount of fine-fraction solid-phase substances are removed, and equipment configuration of a downstream working section is reduced, so that the construction cost and the system operation cost are reduced.

(2) The composition and structure are as follows: comprises a settling tank 23, a spiral auger transmission mechanism, a belt conveyor 1, an overflow tank 5, a first pump tank 25, a tail water delivery pump 24 and a tail water delivery pipe 6.

a. The sedimentation tank 23 is communicated with the overflow tank 5, and the overflow tank 5 is communicated with the first pump tank 25; the settling tank 23, the overflow tank 5 and the first pump tank 25 are designed in a submerged mode, are 3 connected rectangular structures and are built by concrete pouring or red bricks. The sedimentation tank is used for installing a spiral auger, the first pump tank 25 is used for installing a tail water delivery pump 24, and a ladder step is arranged from the bottom of the pump tank to the top of the tank and used for ascending and descending personnel during daily maintenance of equipment.

b. Spiral auger transmission mechanism: consists of a spiral auger 22, a front supporting seat, a rear supporting seat and a driving device. The spiral auger 22 is drawn by a steel plate and welded on the main shaft, and the rear half shaft is fixed on a bottom plate of the settling tank 23 through an embedded part; the front end of the spiral auger 22 is connected with the output end of the reducer of the driving device through a flange plate, is supported on the pre-buried steel frame through the reducer and a support and can rotate along with the motor and the reducer.

c. Belt conveyor 1: is arranged below a discharge outlet of the spiral auger 22 and is used for transporting the dehydrated micro-particle sand to a stockyard.

d. Tail water delivery pump 24: is arranged at the bottom of the first pump pool 25, the inlet end is communicated with the overflow pool 5 through a steel pipe, and the outlet end is connected with the tail water delivery pipe 6.

(3) The working principle is as follows: the tail water to be treated enters a precipitation tank 23, the water body is gradually filled and heightened, the coarse-grained solid phase substances are settled to the bottom of the tank, and the fine-grained solid phase substances overflow to an overflow tank 5 along with the water body; and simultaneously, the spiral auger 22 and the belt conveyor 1 are started to rotate, and the precipitate is scraped and conveyed by the spiral auger 22, dehydrated and falls on a belt of the belt conveyor, so that low-water-content fine-grade dehydrated sand is produced and is transported and stockpiled outside.

The granularity of the overflow solid phase matter is determined by the concentration of the tail water, when the overflow granularity is too coarse, the gate valve of the clean water pipe is opened, the concentration of the tail water in the settling tank 23 becomes thinner, the overflow solid phase matter becomes thinner, otherwise, the overflow solid phase matter becomes coarse, therefore, the solid phase matter in the tail water is discharged in large quantity, the configuration quantity of downstream equipment is greatly reduced, and the production cost is reduced.

When the water level of the overflow tank 5 reaches a certain height, the tail water delivery pump 24 is started, and the tail water is delivered into the dense water separation unit through the delivery pipe 6.

2. A dense water separation unit:

(1) the system functions are as follows: under the action of a gravity field formed by a swirler, the coarse and fine solid fraction separation in the tail water is realized, high-concentration coarse-grained slurry is obtained and is sent to a dehydration and cake-making working section; and (3) overflowing fine fraction tail water is stirred, added with medicine and flocculated to produce high-concentration flocculating constituent slurry, the high-concentration flocculating constituent slurry is merged into coarse fraction slurry for dewatering and cake making, clear water is produced, and the clear water is sent to a clear water turnover pool for recycling by gravity flow or pumping.

(2) The composition and structure are as follows: comprises a cyclone group, an interference settling group and a medicament group.

a. A swirler group: comprises a tail water diversion tank 10, a diversion pipe 9, a classification cyclone 26 (four in the embodiment), a separation cyclone 16 (two in the embodiment) and an underflow gate valve 27.

Tail water diversion tank 10: used for tail water diversion. The tail water from the pretreatment working section enters from the upper part, and the lower part is provided with a hole communicated with the shunt pipe 9.

A shunt pipe 9: for communicating the tail water surge tank 10 with the classifying cyclone 26. The tail water is cut and formed by a steel pipe, one end of the tail water is communicated with the bottom of the tail water diversion tank 10, and the other end of the tail water diversion tank is communicated with the lower part of the upper body of the grading cyclone 26 by a 90-degree cutting angle.

Classifying cyclone 26: the method is used for grading coarse and fine solid fractions in the tail water. The upper body is in a straight cylinder shape, a triangular reinforcing rib is arranged on the outer wall of the middle part of the upper body, the upper body is welded and installed on a steel structure platform 33, and the lower part of the upper body is welded and installed with a flow distribution pipe 10; the upper opening of the upper body is used as a horizontal overflow opening, and the outer wall of the cylinder body is provided with an overflow groove 8 for collecting overflow tail water and sending the overflow tail water into a lifting medicine mixing stirrer 14 through an overflow pipeline 7; the lower body is in a cone shape, a large opening is welded with the lower opening of the upper body, and a small opening is welded and installed on the concrete embedded part; the lower part of the cone is provided with an underflow gate valve 27 through a pipeline for discharging high-concentration slurry.

The separation cyclone 16: used for separating flocculating constituent from clear water. The structure is the same as that of classifying cyclone 26. One end of the pipeline is welded and communicated with the lifting and medicine mixing stirrer 14, and the other end of the pipeline is welded and communicated with the lower part of the upper body of the grading cyclone 26 at a 90-degree cutting angle; the overflow chute 8 is in communication with a clean water basin 20 via a conduit.

Underflow gate valve 27: for discharging the slurry and controlling the underflow concentration. One end is connected with the bottom of the separating cyclone 16 through a flange and a pipeline, and the other end is connected with the mud pit 28 through a pipeline.

b. Interference settling group: comprises a clean water pump 21, a water delivery pipe 4, a gate valve, a water distribution tank 12, an annular water distribution pipe 13 and a steady flow sieve 11.

And the clear water pump 21 is used for pumping interference sedimentation and adjusting the overflow concentration of the pretreatment working section to clear water and is arranged near the clear water tank 20.

Water delivery pipe 4 and gate valve: used for conveying clean water. And the extension section is respectively communicated with a water distribution tank 12 and an annular water distribution pipe 13 which are arranged in a grading cyclone 26 through a gate valve, and extends to a sedimentation tank 23 of the pretreatment unit through a pipeline and the gate valve.

And the water diversion tank 12 is used for water diversion. A cylindrical tank body, two ends of which are sealed; the water delivery pipe 4 penetrates through and is welded on the wall of the grading cyclone 26; the water distribution tank is made of rolled steel plates, the upper opening of the water distribution tank is communicated with the water delivery pipe 4, and the lower part of the water distribution tank is communicated with the annular water distribution pipe through a pipeline.

Annular distributive pipe 13: for dividing water. The inner ring is provided with a plurality of water outlet holes, and clean water can enter the inner cavity of the grading cyclone 26 through the holes.

Flow stabilizing sieve 11: the cyclone overflow device is used for blocking and reducing the rotating speed of the water body at the upper part of the cyclone, and ensuring the quiet overflow water surface. The inner ends of the angle steels and the screen meshes are welded on the middle upper part of the straight barrel body of the cyclone, the number of the cyclones is determined according to the condition, and each cyclone is arranged according to 3 or more than 3.

c. The medicament group: comprises a medicine mixing barrel 19, a diluent medicine tank 36, a medicine pump 35, a medicine pipe 37 and a gate valve.

Agent stirring tank 19: for diluting the mixing agent. A standard plastic stirrer is arranged above the diluted medicament tank 36, and the diluted medicament flows into the tank by gravity flow or pump.

Diluted drug release tank 36: for storing the diluted medicament. Is made of steel plate, and the lower part is provided with a medicament pump 35.

The chemical pump 35: for pumping dilute medicaments. The water inlet is communicated with a diluent barrel 36 through a gate valve and a pipeline, and the water outlet is communicated with a medicine receiving cup of the lifting medicine mixing stirrer 14 through a pipeline, a gate valve and a medicine pipe 37.

(3) The working principle is as follows:

a. the tail water from the tail water delivery pump 24 enters the diversion tank 10, and due to the fall, the tail water is respectively injected into each grading cyclone 26 through the diversion pipe 9, and pushes the water body to rotate at high speed to generate centrifugal force.

b. Under the action of centrifugal force, coarse-grained solids in tail water are thrown to the inner wall of the classification cyclone 26, and descend to the underflow gate valve 27 along the inner wall under the action of compound forces such as self weight, centrifugal force and the like to be discharged, so that high-concentration slurry is obtained. The fine particle fraction in the tail water moves upwards along with the central water column rotating by the classification cyclone 26 to the upper opening of the classification cyclone 26 to be discharged in an overflowing way, and the fine particle fraction is collected by the overflow groove 8 and then is sent to the bottom of the lifting medicine mixing stirrer 14 through the overflow pipe 7.

The settling velocity of the solid in the tail water is restricted by the concentration of the tail water, the settling velocity is high when the concentration is low, and the settling velocity is low otherwise; and (3) opening a clear water gate valve, and allowing clear water to enter the grading cyclone 26 through the inner holes of the water diversion tank 12 and the annular water diversion pipe 13, so that the concentration of tail water is manually adjusted, the solid sedimentation is accelerated, and the overflow particle size of the solids in the tail water is disturbed.

c. After entering the lifting medicine mixing stirrer 14, the tail water containing micro-fine particles is lifted to a water outlet by a high-speed rotating spiral, is injected into a separation cyclone 16 through a pipeline, and pushes the water to rotate under the action of drop height; in the process, the tail water containing micro solids is mixed with the flocculating agent sent from the agent pump 35 and the agent pipe 37, and a flocculation reaction is rapidly generated, and the tail water containing the ultra-micro solids or argillization rapidly generates floccules and clear water.

d. After the flocculating constituent and the clear water enter the separation cyclone 16, the flocculating constituent descends along the inner wall of the separation cyclone 16 under the action of centrifugal force and is discharged through a bottom flow gate valve 27 to obtain high-concentration flocculating slurry; the clear water moves upwards along with the central water column of the separation cyclone 16 to the upper opening to be discharged in an overflowing way, and is sent into a clear water turnover pool for recycling through an overflow trough and a pipeline.

3. A dewatering and cake making unit:

(1) the system functions are as follows: and removing the mud water from the dense water separation unit to produce low-content cement cakes and clear water.

(2) The composition and structure are as follows: comprises a high-pressure slurry pump 29, a box type filter 17, a water collecting tank 45, a water pipe and a conversion gate valve.

High-pressure slurry pump 29: the slurry inlet is arranged on an embedded part of the second pump pool 30, the slurry inlet is communicated with the slurry pool 28 through a gate valve and a pipeline, and the slurry outlet is connected with the slurry inlet of the box type filter 17 through a high-pressure slurry pipe 15.

And (4) a box type filter 17: the slurry inlet is fixed on the mounting platform 33 through a bolt and is communicated with the high-pressure slurry pipe 15; the mounting platform 33 is provided with a mud cake dropping port below the box type filter 17, and dehydrated mud cakes naturally drop and pile through the port and are transferred and transported by a loader.

Water collection tank 45: used for collecting clear water or percolating muddy water produced in the operation process of the box type filter 17, and is made of steel plates and arranged close to the box type filter 17.

Water pipe: is used for conveying clean water or muddy water produced in the process of filter pressing operation. One end is communicated with the water collecting tank 45, and the other end extends to the clean water tank 20 and the overflow tank 5 respectively.

First switching gate valve 48 and second switching valve 50: a first change-over gate valve 48 and a second change-over valve 50 are respectively arranged on the pipeline and used for controlling the trend of filter-pressing clean water or muddy water.

(3) The working principle is as follows: when the high-pressure slurry pump 29 is started, slurry is pumped to the box type filter 17 through the high-pressure slurry pipe 15, solid-liquid separation is realized under the action of high pressure and filter cloth, produced low-water-content slurry cakes fall, are accumulated and are transported outside, and produced clear water or muddy water enters the water collecting tank 45 and the water pipe.

When the clean water is produced, the first gate valve 48 is closed, the second gate valve 50 is opened, and the clean water enters the clean water tank 20 for recycling; when the filtered muddy water is produced, the second gate valve 50 is closed, the first gate valve 48 is opened, and the muddy water returns to the overflow tank 5 through the pipeline.

4. A clear water returning unit:

(1) the system functions are as follows: the clean water produced by the system is returned to the water supply system or the tail water environmental protection treatment system of the invention for recycling.

(2) The composition and structure are as follows: comprises a clean water tank 20, a clean water pump, a water pump (the water pump is arranged beside the clean water pump) and a water delivery pipeline.

Clean water tank 20: for accommodating system production and fresh water replenishment. According to the submerged design, red bricks are used for building or concrete pouring.

The clean water pump 21: the pump is used for pumping and returning clear water and is arranged on the concrete foundation through the embedded part.

Water delivery pipe: used for conveying returned clear water. One end of the steel pipe or the PE pipe is connected with the water outlet of the clean water pump 21, and the other end of the steel pipe or the PE pipe is communicated with a water supply pipeline of a production workshop.

(3) The working principle is as follows: the water pump is started, and the clear water is pumped to return to a water supply system of a production workshop or the clear water pump pumps the clear water to the precipitation tank for recycling

5. An operation control unit:

(1) the system functions are as follows: holographic central control and remote visual operation, so that the accurate operation of the whole system is realized, the operation efficiency is improved, and the production cost is reduced.

(2) The composition and structure are as follows: the intelligent control system comprises a central control console, a video signal device, a power signal device, a prompt and warning signal device, a central control room, a signal transmission line and the like.

a. A central console: a standard piano type operating platform is adopted and comprises a platform, a television screen, an operating platform and a component cabinet. The platform is formed by sheet steel plates, and each component mounting cabinet is arranged below the platform; the television screen is formed by sheet metal and is used for embedding and mounting a video display; the operation panel is formed by sheet steel plates and is used for embedding and installing all start and stop buttons and a frequency converter control panel of the system, and centralized, remote and visual control and adjustment of all sections and electric appliances of the whole system are realized.

b. Video signal: a night vision color high-definition camera is adopted, a plurality of cameras are arranged and installed in each unit (working section), running video information of different parts is collected respectively, and the running video information is transmitted to a camera and a display screen through signal lines.

c. Power supply signal: the instrument type operating table is provided with a voltage meter and an ammeter of main equipment, and current signals of the main equipment are reflected in time.

d. Prompting and warning: the driving arm end or other operation equipment is provided with a sound and flash prompting lamp to prevent safety accidents; a time-delay and sound prompter is arranged below the operating platform to prevent operators from getting tired and leaving behind for a long time.

f. And (4) controlling the room: the light steel movable board house is used for placing the piano type operating table and the electric appliance control cabinet and is a system management control center.

(3) The working principle is as follows:

a. starting a system: when tail water enters the system, a start button is pressed down in sequence, the video system is started, all parts are adjusted to specified parameter values according to video signals and power signals, and the system enters a normal operation state.

b. Operation adjustment: when the system parameters change, the specified parameters are timely recovered through the operating console adjusting device according to the video signals and the power signals.

c. And (3) stopping the system: when the tail water stops being conveyed, a stop button is pressed down, a video signal system is closed, and a power supply is cut off in sequence.

In summary, the present invention mainly solves the problems in the prior art in the following aspects:

1. construction cost: the technical schemes of the traditional rake type thickener, the dam bank dehydration and stockpiling, the deep cone thickener, the box type filter and the vacuum disc type filter all have the problems of large investment and high manufacturing cost, particularly, the manufacturing cost of the former is often measured by tens of millions or even hundreds of millions of yuan, and the tail water treatment becomes an important budget item for project construction and occupies a large proportion. The invention has the advantages of low construction cost of the existing technical schemes of various forms, deficiency of one percent of the technical schemes of the rake thickener and the dam bank dehydration stockpiling, and fundamentally solving the problems of large investment and high construction cost of tail water treatment engineering.

2. The running cost is as follows: because no medicament or trace medicament exists, the cost of the medicament is lower than that of the medicament; the power consumption is low, and the cost of electricity charge is low on the same scale; the automation degree is high, and the labor cost is low on the same scale; the pretreatment solid decrement is more, the equipment configuration is less in the same proportion, and the amortization of the fixed assets is lower in the same proportion; the system has no large high-speed operation component, and the maintenance cost is low; the invention greatly reduces the environmental protection treatment cost of the tail water, and has obvious operation cost advantage compared with the prior various technical schemes.

3. Medicine hazard: the traditional tail water treatment scheme uses polyacrylamide, polyaluminium chloride and other flocculating agents in large dose; the accumulation of a large amount of flocculating agents makes tail water purification and cyclic utilization very difficult, and particularly in the production process of sand and stone, the physical and chemical properties of sand and stone products are changed by soaking a large amount of flocculating agents, so that the quality of the sand and stone products is seriously influenced, and even serious engineering quality accidents are caused.

The invention adopts the process of rotational flow gravity field and natural precipitation solid-liquid separation, can realize solid-liquid separation and mud dehydration cake making of tail water under the condition of no flocculating agent or trace dosing, can avoid or greatly reduce the harm of residual flocculating agent, and better solves the problem of the harm of residual flocculating agent in tail water.

4. And (3) conversion and utilization of mud cakes: the mud cake produced by the traditional tail water treatment technical scheme has high water content (mostly thick mud), and both the stockpiling and the conversion become burdens; the mud cake produced by the method has low moisture content, can be converted into agricultural land reconstruction or building engineering filling materials, and can avoid large-area land occupation and secondary environmental pollution.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The tail water environment-friendly treatment system is characterized by comprising a tail water pretreatment unit, a dense water separation unit, a dehydration and cake making unit and an operation control unit;

the dense water separation unit comprises a cyclone group, an interference settling group and a medicament group; the cyclone group includes: tail water shunt tank, shunt pipe, grading cyclone and separating cyclone; the water inlet direction of the tail water diversion tank is communicated with the tail water conveying pipe, and the water outlet direction of the tail water diversion tank is communicated with the grading cyclone through the diversion pipe; an overflow groove is formed in the upper part of the outer wall of the grading cyclone; the separation cyclone and the grading cyclone are identical in structure and both communicated with a mud pit;

2. The tail water environmental protection treatment system according to claim 1, wherein a plurality of flow stabilizing sieves are arranged on the inner wall of the grading cyclone, and the flow stabilizing sieves are assembled and welded by angle steel and screen meshes.

3. The tail water environmental protection remediation system of claim 1, wherein the filter comprises a box filter or a vacuum disc filter; and a mud cake dropping port is arranged below the filter.

4. The tail water environmental protection treatment system according to claim 1, wherein the dewatering cake-making unit further comprises a water collection tank, and a water inlet end of the water collection tank is communicated with a water outlet of the filter; and the water outlet end of the water collecting tank is respectively communicated with the clean water tank and the overflow tank.

5. The tail water environmental protection treatment system according to claim 1, wherein a clear water tank and a water suction pump in the disturbance settling group form a clear water returning unit, and the clear water tank is communicated with a water supply pipeline through the water suction pump; and water in the clean water tank enters the precipitation tank through the clean water pump or enters the water supply line through the water suction pump.

6. A tail water treatment process is characterized in that the tail water environmental protection treatment system of claims 1-5 is adopted for treatment, and comprises the following steps:

7. The tail water treatment process according to claim 6, wherein the settling velocity of the solid in the tail water entering the classifying cyclone in the step 2) is limited by the concentration of the solid, the settling velocity is high when the concentration is low, and the settling velocity is low when the concentration is low; clear water in the clear water tank is introduced into the water distribution tank through the clear water pump, and the clear water enters the grading cyclone through the water distribution tank and the annular water distribution pipe, so that the concentration of tail water is manually adjusted, the sedimentation of solids is accelerated, and the overflow particle size of the solids in the tail water is disturbed.

8. The tail water treatment process according to claim 6, wherein when clean water is produced in the step 3), the clean water enters a clean water pool for recycling; when the filtered muddy water is produced, the muddy water returns to the overflow tank through the pipeline.

9. The tail water treatment process according to claim 6, wherein the clean water returning unit returns the clean water produced by the system to a water supply line for recycling.