CN110025988B

CN110025988B - Coal slime water concentration treatment system of three-section underflow discharge

Info

Publication number: CN110025988B
Application number: CN201910444308.8A
Authority: CN
Inventors: 周伟; 张勇; 朱金波; 闵凡飞; 刘海增; 冯岸岸
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2021-07-23
Anticipated expiration: 2039-05-27
Also published as: CN110025988A

Abstract

The invention relates to the field of slime water concentration treatment, in particular to a slime water concentration treatment system with three-stage underflow discharge. The invention at least comprises a three-section discharge type rake-free thickener, a flocculating agent distribution tank, a spiral ore pulp medicine mixing barrel, an ore pulp buffer barrel and a pipeline mixer; the flocculating agent distribution groove and the spiral ore pulp medicine mixing barrel are matched in process to realize the point-by-point addition of the medicine and the primary uniform mixing of the medicine and the ore pulp; a plurality of groups of staggered grid bars arranged in the pipeline mixer realize further uniform mixing of the ore pulp and the medicament; the three-section discharge type rake-free thickener consists of a central section concentration pool body and two side chamber section concentration pool bodies, a 'one-middle-two-side' discharge mode is adopted, coarse particles and fine particles are discharged and recovered in a split mode, the coarse particles are discharged from a central bottom flow port, fine particles are sucked and discharged from a side chamber bottom flow port, the fine particles have longer settling time, the bottoms of the concentration pool bodies are in a large-inclination-angle conical shape, materials slide to the bottom flow port by means of self weight, and rakes are not needed for discharge.

Description

Coal slime water concentration treatment system of three-section underflow discharge

Technical Field

The invention relates to the field of slime water concentration treatment, in particular to a slime water concentration treatment system with three-stage underflow discharge.

Background

Most coal preparation plants in China adopt wet coal preparation, coal slime water treatment is an important link in the wet coal preparation process flow, and the coal slime water is required to be deeply clarified and the washing water is required to be circulated in a closed loop from the aspects of economy and environmental protection. Coal preparation plants usually adopt a coagulation method to treat coal slurry, wherein the coagulation method is to add a coagulant into a coal slurry system so that particles in the coal slurry system are agglomerated and then settle by gravity. In the traditional slime water treatment process, a flocculant aqueous solution is generally added into a pipeline or a chute in front of a feeding port of a thickener, so that whether the slime water and the flocculant aqueous solution can be efficiently mixed is realized, and the premise of high-efficiency concentration treatment of the slime water is provided.

The thickener is a key device in a modern coal slime water treatment system, and is a device for completing continuous concentration of coal slime water by utilizing flocculation and sedimentation of solid particles in the coal slime water. The system consists of a tank body for settling the coal slurry water and a bottom flow discharge system for collecting and discharging the sediment to a bottom flow port. The production process is continuous, usually, slime water is fed from the middle part above the tank body, clarified overflow water flows into an overflow water tank from the periphery of the tank body, and a precipitated product (underflow) is pumped out from an underflow port at the conical bottom of the tank body. The traditional thickener is also called a rake thickener, and is provided with a rake for gathering and transporting sediments to the center; the rake thickener is divided into a central transmission type and a peripheral transmission type according to the transmission characteristics; the coal slime thickener is divided into a common thickener and a high-efficiency thickener according to the structural characteristics, wherein the high-efficiency thickener directly feeds coal slime water into a concentrate layer at the middle lower part of a thickener body, shortens the sedimentation distance of the coal slime, is beneficial to sedimentation of coal slime particles, increases the resistance of the coal slime to enter overflow, improves the sedimentation effect, and is called as the high-efficiency thickener, such as an EimcO-BSP (EimcO-BSP) high-efficiency thickener, a domestic high-efficiency thickener and the like. The existing thickener has more researches on the structure of a transmission device and a thickener body, but has less innovation in the design of underflow discharge, and in addition, how to ensure that a medicament and slime water are fully and uniformly mixed and the turbulence degree in the thickener body is smaller, how to ensure the working stability of the thickener and how to prevent a rake rack of the thickener from being raked by high-concentration materials is a research hotspot in the field in recent years.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and designs a spiral ore pulp pesticide mixing barrel and a pipeline mixer to ensure that a flocculating agent aqueous solution and coal slime water are uniformly mixed and enter concentration equipment, thereby creating good initial conditions for flocculation and sedimentation; the concentration equipment adopts a novel three-section discharge type rake-free concentrator, the three-section discharge type rake-free concentrator consists of a central section concentration tank body and two side chamber section concentration tank bodies, a 'one-middle-two-side' discharge mode is adopted, namely the central section concentration tank body adopts the lower part of a central underflow port for discharging, the two side chamber section concentration tank bodies adopt side chamber underflow ports for sucking and discharging materials, the settling speed of large floc coarse particles is high, most of the large floc coarse particles are settled in the central section concentration tank body, the settling time of small floc fine particles is long, and the small floc fine particles can enter the side chamber section concentration tank body for continuous settling; the discharge mode of 'one middle two sides' can realize the recovery of coarse and fine fraction materials respectively, the underflow of the central section concentration tank body is mainly coarse particles and can be recovered by a sedimentation filtration type centrifugal dehydrator, part or all of the middlings are doped, so that higher economic value is obtained, the underflow of the side chamber section concentration tank body is mainly fine particles and can be dehydrated and recovered by a filter press, so that the solid and liquid are completely separated, in addition, the discharge of the concentration tank body does not need rakes, the 'pressure raking' phenomenon is thoroughly solved, and the operation of the concentrator is stable.

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

a coal slime water concentration treatment system with three-section underflow discharge comprises a three-section discharge type rake-free thickener and further comprises the following components:

the flocculant distributing tank is of a cuboid structure, a plurality of small round holes penetrate through the bottom of the cuboid, each small round hole is connected with a vertical chemical adding pipe, and a flocculant aqueous solution is fed onto the spiral annular plates at different height positions of the spiral ore pulp mixing barrel through the vertical chemical adding pipes;

the spiral ore pulp medicine mixing barrel is of a top-down spiral structure, ore pulp is fed from a feeding port at the upper part and spirally moves downwards along a spiral annular plate, the spiral annular plates at different height positions are provided with medicines by vertical medicine adding pipes, the ore pulp and the medicines are uniformly mixed and then discharged from a discharging port at the lower part and enter the ore pulp buffer barrel, the ore pulp in the ore pulp buffer barrel is conveyed through a pipeline, and a pipeline mixer is arranged on a conveying pipeline to further realize the mixing of the ore pulp and the flocculating medicines;

the pipeline mixer is a cylinder, a plurality of groups of grid bars are arranged in the pipeline mixer in a staggered mode, turbulence of fluid flowing through the grid bars is increased, mixing of ore pulp and flocculating agents is achieved, and the mixed ore pulp enters a feeding buffer chamber of the three-section discharge type rake-free thickener;

the three-section discharge type rake-free thickener consists of a central section concentration pool body and two side chamber section concentration pool bodies; a feeding buffer chamber is designed at the central position of the upper part of the central section concentration tank body, and a stirring shaft is arranged at the central position of the upper part of the feeding buffer chamber; the stirring shaft is driven by a motor to rotate at a low speed, a plurality of layers of stirring impellers are designed along different vertical heights of the stirring shaft, the plurality of layers of stirring impellers rotate along with the stirring shaft, a horn-shaped discharging barrel is connected below the feeding buffer chamber, the horn-shaped discharging barrel downwards extends into a high-concentration floc layer at the middle lower part of the central section concentration tank body, and solid particles are remained in the floc and settle to the bottom of the central section concentration tank body; the bottom of the central section concentration tank body is in a large-inclination-angle conical shape, solid particles settle to the bottom of the central section concentration tank body and then gradually slide to a central underflow port by means of self weight, and the central underflow port is connected with a slurry pump and used for discharging materials under the suction action of the slurry pump; overflow of the central section concentration tank body flows to the side chamber section concentration tank body automatically through a shared groove edge of the side chamber section concentration tank body; the side chamber section concentrated tank body is arranged close to the left side and the right side of the central section concentrated tank body, the structures of the side chamber section concentrated tank bodies on the left side and the right side are the same, the bottom of the side chamber section concentrated tank body is in a large-inclination-angle conical shape, materials slide to a side chamber bottom flow port gradually by self weight, the materials at the side chamber central bottom flow port adopt a discharge mode of high-lift pump suction, and a high-pressure flushing pipe is also arranged on an upper suction pipeline and used for pipeline dredging; the overflow water of the side chamber section concentration tank body is discharged from the clear water overflow weir.

The invention has the beneficial effects that:

1) the flocculant distributing tank, the spiral ore pulp medicine mixing barrel, the pipeline mixer and the three-section discharge type harrow-free thickener are matched together to form a coal slime water concentration treatment system, the system is reasonably arranged with devices along the flow direction of coal slime water, the design of the devices also reflects the process requirements of coal slime water treatment, the flocculant distributing tank and the spiral ore pulp medicine mixing barrel realize batch addition of a medicament and primary uniform mixing of the medicament and ore pulp, then the uniform mixing is further realized through the pipeline mixer, flocs are uniformly presented in the whole coal slime water system, and further enter the three-section discharge type harrow-free thickener, and the three-section discharge type harrow-free thickener creatively adopts a 'one-middle-two-side' discharge mode on the basis of the traditional high-efficiency thickener, and has the following advantages compared with the existing thickener: coarse particles and fine particles are discharged in different ports, different product structures can be formed, the settling speed of large floc coarse particles is high, most of the large floc coarse particles are discharged from a central underflow port of a central section concentration tank body and can become a medium coal product, and small floc fine particles enter a side chamber section concentration tank body to continue settling and are discharged from a side chamber underflow port to form a tail coal sludge product; whether the fine particles can settle in the thickener or not is mainly determined by the horizontal movement distance of the fine particles in the thickener, the ultimate horizontal movement distance of the fine particles in the three-section discharge type rake-free thickener is the sum of the radius r of the concentrated pond body at the central section and the diameter 2r of the concentrated pond body at the side chamber section, namely 3r, which is equivalent to 3 series processes of a common central feeding thickener, the sedimentation effect is the same, and the occupied area is small and can be reduced by 1/3; the side chamber underflow port discharge of the side chamber section concentration tank body adopts an updraft type, so that the civil engineering cost is reduced, and the daily maintenance is facilitated; fourthly, the concentrated tank body is discharged without rakes, the phenomenon of pressing rakes is thoroughly solved, and the operation of the concentrator is stable.

2) The flocculating agent distribution groove and the spiral ore pulp medicine mixing barrel are matched in process to realize the point-by-point addition of the medicine and the primary uniform mixing of the medicine and the ore pulp; the bottom of the flocculant distribution tank is penetrated with a plurality of small round holes, each small round hole is connected with a vertical medicament adding pipe, flocculant aqueous solution is fed into the spiral annular plates on different height positions of the spiral ore pulp mixing barrel through the vertical medicament adding pipes, the division point addition of the medicament is realized, ore pulp moves downwards spirally along the spiral annular plates, and the preliminary uniform mixing of the ore pulp and the medicament is realized by means of the change of the flow direction and the flow rate of the spiral pulp.

3) The pipeline mixer realizes further uniform mixing of the ore pulp and the medicament, and the plurality of groups of staggered grid bars arranged inside the pipeline mixer increase the turbulence degree of the fluid and realize uniform mixing of the ore pulp and the flocculating medicament.

4) The three-section discharge type rake-free thickener is composed of a central section concentration tank body and two side chamber section concentration tank bodies, a feeding buffer chamber is designed at the upper central position of the central section concentration tank body, a stirring shaft with a plurality of layers of stirring impellers is arranged at the upper central position of the feeding buffer chamber, the stirring shaft rotates at a low speed to enable flocs to be uniformly presented in the whole coal slime water system, a horn-shaped discharge barrel is connected below the feeding buffer chamber, the horn-shaped discharge barrel downwards and directly enters a high-concentration floc layer at the middle lower part of the central section concentration tank body, solid particles are remained in the flocs and settle to the bottom of the central section concentration tank body, the bottom of the central section concentration tank body is in a large inclination angle, and conical solid particles settle to the bottom of the central section concentration tank body and then gradually slide to a central bottom flow port by dead weight, the central underflow port is connected with a slurry pump and discharges materials under the suction action of the slurry pump; fine particles which are not settled become overflow of a central section concentration tank body, the overflow flows to a side chamber section concentration tank body by the side of a shared groove of the side chamber section concentration tank body, the maximum horizontal movement distance in the side chamber section concentration tank body is 2r of the diameter of the side chamber section concentration tank body, which is 2 times of the settling time of a central feeding concentration machine, the bottom of the side chamber section concentration tank body is in a large-inclination-angle conical shape, materials slide to a side chamber bottom flow port gradually by self weight, the material at the side chamber central bottom flow port adopts a discharge mode of sucking up by a high-lift pump, and a high-pressure flushing pipe is also arranged on an upper suction pipeline and used for pipeline dredging; the overflow water of the side chamber section concentration tank body is discharged from the clear water overflow weir; the whole three-section discharge type rake-free thickener has no need of rakes for underflow discharge, thoroughly solves the rake pressing phenomenon, and has stable operation.

Drawings

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

FIG. 2 is an enlarged view of a portion of the flocculant distribution tank of the configuration of FIG. 1;

figure 3 is a schematic structural view of the spiral type ore pulp mixing barrel in the structure of figure 1;

FIG. 4 is a schematic view of the structure of the feeding buffer chamber in the structure of FIG. 1;

the correspondence between the illustrated structures and the names of the components of the present invention is as follows:

1-flocculant distribution tank 1A-vertical agent adding pipe 1B-small round hole 2-spiral ore pulp mixing barrel 2A-spiral annular plate 2B-feeding port 2C-discharging port 3-ore pulp buffer barrel

3C-pipeline 4-pipeline mixer 5-three-section discharge type rake-free thickener 5A-central section concentration pool body

5A 1-feeding buffer chamber 5A 2-stirring shaft 5A 3-motor 5A 4-stirring impeller

5A 5-horn-shaped discharge cylinder 5A 6-pool bottom 5A 7-central bottom flow port of central section concentration pool body

5A 8-slurry pump 5A 9-shared tank edge 5B-side chamber section concentration tank body 5B 1-high-lift pump

5B 2-high pressure flushing pipe 5B 3-pool bottom of side chamber section concentration pool body 5B 4-side chamber bottom flow port

5B 5-clear water overflow weir

Detailed Description

For ease of understanding, specific embodiments of the present invention are described further herein with reference to FIGS. 1-4:

the concrete components of the invention are divided into several modules, including: the system comprises a flocculating agent distribution tank (1), a spiral ore pulp mixing barrel (2), an ore pulp buffer barrel (3), a pipeline mixer (4) and a three-section discharge type rake-free thickener (5). The following are described one by one:

1. flocculating agent distributing trough

The flocculating agent distributing chute is the cuboid structure, and the bottom of cuboid runs through has a plurality of little round holes (1B), and perpendicular medicament adds pipe (1A) is connected in every little round hole (1B), and flocculating agent aqueous solution adds pipe (1A) through perpendicular medicament and gives on spiral annular plate (2A) on the not co-altitude position of going into spiral ore pulp medicine mixing barrel (2).

2. Spiral ore pulp medicine mixing barrel

Spiral ore pulp medicine mixing barrel (2) is top-down's heliciform structure, the ore pulp is given into from feed inlet (2B) on upper portion, along spiral annular plate (2A) downward screw motion, perpendicular medicament adds pipe (1A) and adds the medicament on spiral annular plate (2A) on different high positions, discharge gate (2C) of lower part are discharged after ore pulp and the medicament homogeneous mixing, get into ore pulp buffering bucket (3), the ore pulp in ore pulp buffering bucket (3) passes through pipeline (3C) and carries, set up pipeline mixer (4) on pipeline (3C) of carrying, further realize the mixture of ore pulp and flocculation medicament.

3. Pipeline mixer

The pipeline mixer (4) is a cylinder, a plurality of groups of grid bars are arranged in the pipeline mixer in a staggered mode, the turbulence of fluid flowing through the grid bars is increased, the mixing of ore pulp and flocculating agents is achieved, and the mixed ore pulp enters a feeding buffer chamber (5A1) of the three-section discharge type rake-free thickener (5).

4. Three-section discharge rake-free thickener

The three-section discharge type rake-free thickener (5) consists of a central section concentration pool body (5A) and two side chamber section concentration pool bodies (5B); a feeding buffer chamber (5A1) is designed at the central position of the upper part of the central section concentration tank body (5A), and a stirring shaft (5A2) is arranged at the central position of the upper part of the feeding buffer chamber (5A 1); the stirring shaft (5A2) is driven by a motor (5A3) to rotate at a low speed, multiple layers of stirring impellers (5A4) are designed along different vertical heights of the stirring shaft (5A2), the multiple layers of stirring impellers (5A4) rotate along with the stirring shaft (5A2), a horn-shaped discharging barrel (5A5) is connected below the feeding buffer chamber (5A1), the horn-shaped discharging barrel (5A5) downwards extends into a high-concentration floc layer at the middle lower part of the central-section concentration tank body, solid particles are left in the flocs and settle to the bottom (5A6) of the central-section concentration tank body; the bottom (5A6) of the central section concentrated tank body is in a large-inclination-angle conical shape, solid particles settle to the bottom (5A6) of the central section concentrated tank body and then gradually slide to a central underflow port (5A7) by self weight, the central underflow port (5A7) is connected with a slurry pump (5A8), and the materials are discharged through the suction effect of the slurry pump (5A 8); overflow of the central section concentration tank body automatically flows to the side chamber section concentration tank body (5B) through a shared groove edge (5A9) of the side chamber section concentration tank body; the side chamber section concentrated tank body (5B) is arranged close to the left side and the right side of the central section concentrated tank body, the structures of the side chamber section concentrated tank bodies on the left side and the right side are the same, the bottom of the side chamber section concentrated tank body is in a large-inclination-angle conical shape, materials slide to a side chamber underflow port (5B4) gradually by self weight, the materials at the side chamber underflow port adopt a discharge mode of sucking up by a high-lift pump (5B1), and a high-pressure flushing pipe (5B2) is also arranged on an upper suction pipeline and used for dredging the pipeline; the overflow water of the side chamber section concentration tank body is discharged from a clear water overflow weir (5B 5).

In conclusion, the system and the working mechanism fully consider the process characteristics of flocculation and sedimentation of the coal slime water, the flocculation reagent aqueous solution and the coal slime water are uniformly mixed, the system has good initial conditions of flocculation and sedimentation, the three-section discharge type harrowing-free thickener adopts a discharge mode of 'one middle and two sides', the coarse and fine particles are discharged and recovered in a split mode, and the fine particles have longer sedimentation time; the side chamber bottom flow port discharge adopts an updraft type, so that the civil engineering cost is reduced, and the daily maintenance is facilitated; the concentrated tank body is discharged without rakes, so that the phenomenon of rake pressing is thoroughly solved; the whole concentration operation saves more medicament than traditional concentration settlement equipment, has higher concentration efficiency, works more reliably and stably, and production cost reduction is also very obvious.

Claims

1. A coal slime water concentration treatment system with three-section underflow discharge comprises a three-section discharge type rake-free thickener (5), and is characterized by also comprising the following components: a flocculating agent distributing tank (1), a spiral ore pulp mixing barrel (2), an ore pulp buffer barrel (3) and a pipeline mixer (4); the flocculant distributing tank (1) is of a cuboid structure, a plurality of small round holes (1B) penetrate through the bottom of the cuboid, each small round hole (1B) is connected with a vertical chemical adding pipe (1A), a flocculant aqueous solution is fed onto spiral annular plates (2A) at different height positions of a spiral ore pulp mixing barrel (2) through the vertical chemical adding pipes (1A), the pipeline mixer (4) is a cylinder, a plurality of groups of grid bars are arranged inside the pipeline mixer in a staggered mode, the turbulence of fluid flowing through the grid bars is increased, the mixing of the ore pulp and the flocculant is realized, and the mixed ore pulp enters a feeding buffer chamber (5A1) of the three-section discharge type rake-free thickener (5);

the three-section discharge type rake-free thickener (5) consists of a central section concentration pool body (5A) and two side chamber section concentration pool bodies (5B); a feeding buffer chamber (5A1) is designed at the central position of the upper part of the central section concentration tank body (5A), and a stirring shaft (5A2) is arranged at the central position of the upper part of the feeding buffer chamber (5A 1); the stirring shaft (5A2) is driven by a motor (5A3) to rotate at a low speed, multiple layers of stirring impellers (5A4) are designed along different vertical heights of the stirring shaft (5A2), the multiple layers of stirring impellers (5A4) rotate along with the stirring shaft (5A2), a horn-shaped discharging cylinder (5A5) is connected below the feeding buffer chamber (5A1), the horn-shaped discharging cylinder (5A5) downwards and directly enters a high-concentration floc layer at the middle lower part of the central-section concentration tank body (5A), solid particles are left in the flocs and settle to the bottom (5A6) of the central-section concentration tank body; the bottom (5A6) of the central section concentrated tank body is in a large-inclination-angle conical shape, solid particles settle to the bottom (5A6) of the central section concentrated tank body and then gradually slide to a central underflow port (5A7) by self weight, the central underflow port (5A7) is connected with a slurry pump (5A8), and the materials are discharged through the suction effect of the slurry pump (5A 8); the overflow of the central section concentration tank body (5A) automatically flows to the side chamber section concentration tank body (5B) through a shared groove edge (5A9) of the side chamber section concentration tank body (5B); the side chamber section concentrated cell body (5B) be close to central segment concentrated cell body (5A) left and right both sides and arrange, the structure of the side chamber section concentrated cell body (5B) of left and right both sides is the same, bottom of the pool (5B3) of the concentrated cell body of side chamber section is big inclination conical, the material leans on the dead weight to slide to side chamber underflow opening (5B4) gradually, the material of side chamber underflow opening (5B4) adopts the row material mode of high-lift pump (5B1) updraft, still be provided with high pressure flushing pipe (5B2) on the last suction pipe, be used for the pipeline desilting, the overflow water of the concentrated cell body of side chamber section is discharged from clear water overflow weir (5B 5).

2. The system for treating and concentrating slime water of three-stage underflow discharge according to claim 1, wherein: spiral ore pulp medicine mixing barrel (2) be top-down's heliciform structure, the ore pulp is given into from feed inlet (2B) on upper portion, along spiral annular plate (2A) spiral motion down, perpendicular medicament adds pipe (1A) and adds the medicament on spiral annular plate (2A) on the not co-altitude position, discharge gate (2C) of lower part are followed after ore pulp and the medicament homogeneous mixing, get into in ore pulp buffering bucket (3), the ore pulp in ore pulp buffering bucket (3) passes through pipeline (3C) and carries, set up pipeline mixer (4) on pipeline (3C) of carrying, further realize the mixture of ore pulp and flocculation medicament.