CN110025988A - A kind of slime water concentration processing system of three sections of underflow discharges - Google Patents

Abstract

The invention relates to the field of coal slime water concentration treatment, in particular to a coal slime water concentration treatment system with three-stage underflow discharge. The invention includes at least a three-stage discharge type rakeless thickener, and also includes a flocculant distribution tank, a spiral type ore pulp mixing barrel, an ore buffer buffer tank and a pipeline mixer; Realize the point-by-point addition of the agent, and the preliminary uniform mixing of the agent and the slurry; the staggered groups of grid bars arranged inside the pipeline mixer realize the further uniform mixing of the slurry and the agent; the three-stage discharge type rakeless thickener consists of a central section. Concentration tank body and two side chamber sections are composed of concentration tank body. The "one middle and two sides" discharge method is adopted to realize the discharge and recovery of coarse and fine particles. Suction and discharge, the fine-grained grade has a longer settling time, the bottom of the concentration tank body is conical with a large inclination angle, the material slides down to the bottom flow port by its own weight, and no rake is required for discharging.

Description

A coal slime water concentration treatment system with three-stage underflow discharge

technical field

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

Background technique

The vast majority of coal preparation plants in my country use wet coal preparation. Coal slime water treatment is an important part of the wet coal preparation process. From the perspective of economy and environmental protection, it is required that the slime water be deeply clarified and the washing water be closed in a closed circuit. Coal preparation plants usually use the coagulation method to treat the slime water. The so-called coagulation method is to add a coagulant to the slime water system to make the particles in the slime water system agglomerate and then settle by gravity. In the traditional coal slime water treatment process, the addition of the flocculant aqueous solution is generally added to the pipeline or chute before the feed inlet of the thickener. Whether the efficient mixing of the coal slime water and the flocculant aqueous solution can be achieved is the premise of the efficient concentration treatment of the coal slime water. .

The thickener is the key equipment in the modern coal slime water treatment system. The thickener is a device that uses the flocculation and sedimentation of solid particles in the coal slime water to complete the continuous concentration of the coal slime water. Its essence is composed of a pool for coal slime water sedimentation and an underflow discharge system that collects the sediment at the bottom flow outlet and discharges it. Its production process is continuous. Usually, the coal slime water is fed from the upper middle of the pool body, the clarified overflow water flows into the overflow tank from the periphery of the pool body, and the precipitated product (underflow) is used from the bottom flow port at the bottom of the pool body. Pump out. The traditional thickener, also known as the rake thickener, has a rake that enriches and transports the sediment to the center; the rake thickener can be divided into two types: the central transmission type and the peripheral transmission type according to the transmission characteristics; from the structural characteristics It can be divided into two types: ordinary thickener and high-efficiency thickener. The high-efficiency thickener directly feeds the coal slime water into the concentrate layer in the middle and lower part of the thickener body, which shortens the distance of coal slime settlement and helps the slime The sedimentation of particles increases the resistance of coal slime entering the overflow and improves the sedimentation effect, so it is called a high-efficiency thickener, such as EimcO-BSP high-efficiency thickener, domestic high-efficiency thickener, etc. Existing thickeners have more research on the transmission device and body structure, but less innovation in the design of underflow discharge. In addition, how to ensure that the chemical and the coal slime water are fully mixed evenly and the degree of turbulence in the thickener body is small, how to ensure The thickener works stably, and preventing the rake frame of the thickener from being "pressed" by high-concentration materials has become a research hotspot in the field in recent years.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and design a spiral-type ore pulp mixing tank and a pipeline mixer to ensure that the flocculation agent aqueous solution and the coal slime water are evenly mixed into the concentration equipment, so as to create good initial conditions for flocculation and sedimentation; the concentration equipment A new type of three-stage discharge type rakeless thickener is adopted. The three-stage discharge type rakeless thickener consists of a central section concentration tank body and two side chamber section concentration tank bodies. The method, that is, the central section of the concentration tank body adopts the bottom discharge of the center bottom flow port, and the two side chamber sections of the concentration tank body adopts the side chamber bottom flow port to suck and discharge the material. The fine particles of flocculation have a long sedimentation time, and can enter the side chamber section concentration tank to continue the sedimentation; the "one middle and two sides" discharge method can realize the recovery of coarse and fine-grained materials respectively, and the underflow of the central section concentration tank body is composed of coarse particles. Mainly, it can be recovered by a sedimentation filter centrifugal dehydrator, and some or all of the medium coal can be mixed into it to obtain higher economic value. Realize the complete separation of solid and liquid. In addition, there is no need for a rake to discharge the material in the concentration tank, which completely solves the phenomenon of "pressing rake", and the thickener works stably.

To achieve the above object, the present invention has adopted the following technical solutions:

A three-stage underflow discharge coal slime water concentration treatment system includes a three-stage discharge type rakeless thickener, and also includes the following components:

A flocculant distribution tank, the flocculant distribution tank has a cuboid structure, and the bottom of the cuboid is penetrated with a plurality of small round holes, each small round hole is connected to a vertical chemical addition pipe, and the flocculant aqueous solution is fed through the vertical chemical addition pipe To the spiral annular plate at different heights of the spiral slurry mixing cartridge;

Spiral ore pulp mixing barrel, the spiral ore pulp mixing barrel is a top-down spiral structure. The ore pulp is fed from the upper feeding port and spirally moves downward along the spiral annular plate. Add chemicals on the spiral ring plates at different heights, the pulp and the chemicals are evenly mixed and discharged from the lower discharge port, and enter into the pulp buffer barrel. to further realize the mixing of pulp and flocculation agent;

Pipeline mixer, the pipeline mixer is a cylinder, and its interior is staggered with multiple groups of grid bars, the turbulence degree of the fluid flowing through the grid bars increases, and the mixing of pulp and flocculation agent is realized, and the mixed pulp enters the three Feed buffer chamber of segment discharge type rakeless thickener;

Three-stage discharge type rakeless thickener, the three-stage discharge type rakeless thickener consists of a central section concentration tank body and two side chamber section concentration tank bodies; the upper center of the central section concentration tank body The position is designed with a feeding buffer chamber, and a stirring shaft is arranged at the upper center of the feeding buffer chamber; the stirring shaft is driven by a motor to rotate at a low speed, and a multi-layer stirring impeller is designed along the stirring shaft at different vertical heights. The impeller rotates with the stirring shaft, a horn-shaped discharge cylinder is connected below the feeding buffer chamber, and the horn-shaped discharge cylinder goes straight down into the high-concentration floc layer in the middle and lower part of the central section concentration tank body, and the solid particles remain in the high-concentration floc layer. In the flocculation, it settles to the bottom of the central section of the concentration tank body; the bottom of the central section of the concentration tank body is in the shape of a large inclination cone, and the solid particles settle to the bottom of the central section of the concentration tank body and then gradually slide to the center by its own weight. Bottom flow port, the center bottom flow port is connected with the slurry pump, and the material is discharged through the suction action of the slurry pump; the overflow of the central section concentration tank body flows to the side chamber section concentration tank body through the shared groove edge with the side chamber section concentration tank body; The side chamber section concentration tank body is arranged close to the left and right sides of the central section concentration tank body, the structure of the side chamber section concentration tank body on the left and right sides is the same, and the bottom of the side chamber section concentration tank body is in the shape of a large inclination cone. The material gradually slides down to the bottom flow port of the side chamber by its own weight. The material at the bottom flow port in the center of the side chamber adopts the upward suction discharge method of the high-lift pump. There is also a high-pressure flushing pipe on the upper suction pipe for pipe dredging; the side chamber section concentrates the tank body The overflow water is discharged from the clear water overflow weir.

The beneficial effects of the present invention are:

1), the flocculant distribution tank of the present invention, the spiral type ore slurry mixing barrel, the pipeline mixer, and the three-stage discharge type rakeless thickener cooperate together to form a coal slime water concentration treatment system, and the system is reasonably arranged along the flow direction of the coal slime water. , The design of the device also reflects the technological requirements of coal slurry water treatment. The flocculant distribution tank and the spiral slurry mixing tank realize the batch addition of the agent and the initial uniform mixing of the agent and the slurry, and then the pipeline mixer is used to further achieve uniform mixing. , the flocs are evenly present in the entire coal slime water system, and further, enter the three-stage discharge type rakeless thickener, and the three-stage discharge type rakeless thickener is based on the traditional high-efficiency thickener. Compared with the existing thickener, the "middle and two sides" discharge method has the following advantages: ① Coarse and fine particles are discharged separately, and different product structures can be prepared. Large flocs and coarse particles settle quickly, and most are concentrated in the central section The center bottom flow port of the tank body is discharged, and it can become a medium coal product. The small floc and fine particles enter the side chamber section of the concentration tank body to continue the sedimentation, and are discharged from the side chamber bottom flow port to form a tail slime product; ② Whether the fine particles are in the thickener? Settlement mainly depends on the horizontal movement distance of fine particles in the thickener. The limit horizontal movement distance of fine particles in the tank of the three-stage discharge type rakeless thickener is the radius r of the central section and the diameter of the side chamber section 2r. The sum, that is, 3r, is equivalent to 3 serial processes of ordinary central feeding thickeners, with the same settling effect, and the small footprint can be reduced by 1/3; Reduce the cost of civil construction and facilitate daily maintenance; ④ The concentration tank body does not need rakes for discharging, which completely solves the phenomenon of "pressing rakes", and the thickener works stably.

2) The technical cooperation of the flocculant distribution tank and the spiral ore pulp mixing barrel realizes the point-by-point addition of the agent and the preliminary uniform mixing of the agent and the slurry; there are many small round holes running through the bottom of the flocculant distribution tank, each small The circular hole is connected to a vertical chemical addition pipe, and the flocculant aqueous solution is fed into the spiral annular plate at different heights of the spiral ore slurry mixing cylinder through the vertical chemical addition pipe to realize the point addition of the chemical, and the slurry follows the spiral annular plate. The downward spiral movement, with the help of the change of the slurry flow direction and flow rate of the spiral movement, realizes the initial uniform mixing of the slurry and the agent.

3) The pipeline mixer realizes the further uniform mixing of the pulp and the agent, and the multiple groups of grid bars arranged in the pipeline mixer increase the turbulence of the fluid and realize the uniform mixing of the pulp and the flocculation agent.

4) The three-stage discharge type rakeless thickener realizes the efficient concentration and sedimentation of ore particles and the separate discharge of coarse and fine materials. The three-stage discharge type rakeless thickener consists of a central section concentration tank and two side chamber sections The concentration tank body is composed of a feeding buffer chamber in the upper central position of the central section of the concentration tank body. A stirring shaft with a multi-layer stirring impeller is arranged in the upper central position of the feeding buffer chamber. The low-speed rotation of the stirring shaft promotes the flocculation throughout It is evenly present in the coal slime water system. A horn-shaped discharge cylinder is connected below the feeding buffer chamber, and the horn-shaped discharge cylinder goes straight down into the high-concentration floc layer in the middle and lower part of the concentration tank body in the central section, and the solid particles remain in the flocculation. In the mass, it settles to the bottom of the central section of the concentration tank body, the bottom of the central section of the concentration tank body is conical with a large inclination angle, and the solid particles settle to the bottom of the central section of the concentration tank body and then gradually slide to the center bottom flow port by its own weight. The center bottom flow port is connected with the slurry pump, and the material is discharged through the suction action of the slurry pump; the unsettled fine particles become the overflow of the central section concentration tank body, and flow to the side chamber section through the shared groove edge with the side chamber section concentration tank body For the concentration tank body, the limit horizontal movement distance in the side chamber section concentration tank body is the diameter of the side chamber section concentration tank body 2r, which is twice the settling time of the central feeding concentrator. The material gradually slides down to the bottom flow port of the side chamber by its own weight. The material at the bottom flow port in the center of the side chamber adopts the upward suction discharge method of the high-lift pump. There is also a high-pressure flushing pipe on the upper suction pipe for pipe dredging; the side chamber section concentrates the tank body The overflow water is discharged from the clear water overflow weir; the underflow discharge of the entire three-stage discharge type rakeless thickener does not require a rake, which completely solves the phenomenon of "pressing rake" and the thickener works stably.

Description of drawings

Fig. 1 is the system flow chart of the present invention;

Fig. 2 is a partial enlarged view of the flocculant distribution tank in the structure of Fig. 1;

Fig. 3 is in the structure of Fig. 1, the structural representation of the spiral type ore pulp mixing barrel;

Fig. 4 is the structure schematic diagram of the feeding buffer chamber in the structure of Fig. 1;

The corresponding relationship between each structure shown in the figure and the name of the component of the present invention is as follows:

1-Flocculant distribution tank 1A-Vertical chemical addition pipe 1B-Small round hole 2-Spiral pulp mixing barrel

2A-spiral ring plate 2B-feeding port 2C-discharging port 3-pulp buffer barrel

3C-Pipeline 4-Pipeline mixer 5-Three-stage discharge type rakeless thickener 5A-Central section thickening tank

5A1-feed buffer chamber 5A2-stirring shaft 5A3-motor 5A4-stirring impeller

5A5-trumpet-shaped discharge cylinder 5A6-bottom of the central concentration tank body 5A7-central bottom flow port

5A8-Slurry pump 5A9-Common groove edge 5B-Side chamber section concentration tank body 5B1-High lift pump

5B2-High-pressure flushing pipe 5B3-The bottom of the concentrating tank body of the side chamber section 5B4-The bottom flow port of the side chamber

5B5-Clear water overflow weir

Detailed ways

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

The specific components of the present invention are divided into several major modules, including: a flocculant distribution tank (1), a spiral ore pulp mixing barrel (2), a slurry buffer barrel (3), a pipeline mixer (4) and a three-stage discharger Material type rakeless thickener (5). The following are described one by one:

1. Flocculant distribution tank

The flocculant distribution tank has a cuboid structure, and the bottom of the cuboid is penetrated with a plurality of small circular holes (1B), each small circular hole (1B) is connected to a vertical chemical addition pipe (1A), and the flocculant aqueous solution passes through the vertical chemical addition pipe (1A). 1A) is fed to the spiral annular plate (2A) at different height positions of the spiral slurry mixing cartridge (2).

2. Spiral pulp mixing barrel

The spiral ore pulp mixing barrel (2) has a spiral structure from top to bottom. The ore pulp is fed from the upper feeding port (2B) and spirally moves downward along the spiral annular plate (2A), and the vertical chemical adding pipe (1A) ) Add chemicals on the spiral annular plate (2A) at different heights, the pulp and the chemicals are evenly mixed and discharged from the lower discharge port (2C), into the pulp buffer barrel (3), and the pulp buffer barrel (3) The ore slurry is transported through a pipeline (3C), and a pipeline mixer (4) is arranged on the transported pipeline (3C) to further realize the mixing of the ore slurry and the flocculating agent.

3. Pipeline mixer

The pipeline mixer (4) is a cylinder with multiple sets of grid bars staggered in its interior. The turbulence of the fluid flowing through the grid bars increases to realize the mixing of the pulp and the flocculating agent, and the mixed pulp enters the three-stage discharge type. Feed buffer chamber (5A1) of the rakeless thickener (5).

4. Three-stage discharge type rakeless thickener

The three-stage discharge type rakeless thickener (5) consists of a central section concentration tank body (5A) and two side chamber section concentration tank bodies (5B); the upper central position of the central section concentration tank body (5A) A feeding buffer chamber (5A1) is designed, and a stirring shaft (5A2) is arranged in the upper center of the feeding buffer chamber (5A1); the stirring shaft (5A2) is driven by the motor (5A3) to rotate at a low speed, 5A2) There are multi-layer stirring impellers (5A4) designed at different vertical heights. The multi-layer stirring impellers (5A4) rotate together with the stirring shaft (5A2), and a horn-shaped discharge cylinder is connected below the feeding buffer chamber (5A1). (5A5), the horn-shaped discharge cylinder (5A5) goes straight down into the high-concentration floc layer in the middle and lower part of the central section concentration tank body, and the solid particles remain in the flocculation and settle to the bottom of the central section concentration tank body ( 5A6); The bottom of the pool (5A6) of the central section concentration pool body is in the shape of a large inclination angle, and the solid particles settle to the bottom (5A6) of the central section concentration pool body and then gradually slide down to the center bottom flow port (5A7) by its own weight, The center bottom flow port (5A7) is connected to the slurry pump (5A8), and the material is discharged through the suction action of the slurry pump (5A8); the overflow of the concentration tank in the center section passes through the common groove edge (5A9) of the concentration tank in the side chamber section. ) flows to the side chamber section concentration tank body (5B); the side chamber section concentration tank body (5B) is arranged next to the left and right sides of the center section concentration tank body, and the side chamber section concentration tank bodies on the left and right sides have the same structure , the bottom of the concentrating tank body in the side chamber section is conical with a large inclination angle, and the material gradually slides down to the bottom flow port (5B4) of the side chamber by its own weight. There is also a high-pressure flushing pipe (5B2) on the suction pipe for pipe dredging; the overflow water in the side chamber section concentration tank body is discharged from the clear water overflow weir (5B5).

In summary, the system and working mechanism of the present invention fully consider the process characteristics of coal slime water flocculation and sedimentation, the flocculation agent aqueous solution and coal slime water are mixed evenly, and have good initial conditions for flocculation and sedimentation. The discharge method of "two sides", the coarse and fine particles are discharged and recovered separately, and the fine particles have a longer settling time; the discharge at the bottom of the side chamber adopts the upward suction type, which reduces the civil construction cost and facilitates daily maintenance; the concentration tank There is no need for rake for body discharge, which completely solves the phenomenon of "pressing rake"; the entire concentration operation saves more chemicals than traditional concentration and sedimentation equipment, has higher concentration efficiency, more reliable and stable work, and significantly reduces production costs.

Claims (4)

1. a kind of slime water concentration processing system of three sections of underflow discharges, including three sections of discharging types are without rake thickener (5), feature Be to further include following component part: flocculant distributing trough (1), spiral ore pulp mix explosive barrel (2), ore pulp buffer barrel (3) and pipe Road mixer (4)；The flocculant distributing trough (1) is rectangular parallelepiped structure, and the bottom of cuboid, which is run through, multiple small sircle holes (1B), each small sircle hole (1B) connect a vertical medicament adding tube (1A), and flocculant aqueous solution passes through vertical medicament adding tube (1A) is fed on the helical annular plate (2A) that spiral ore pulp mixes on the different height position of cylindrantherae (2).

2. a kind of slime water concentration processing system of three sections of underflow discharges according to claim 1, it is characterised in that: described Spiral ore pulp mix explosive barrel (2) be top-down helicoidal structure, ore pulp is fed from the material inlet (2B) on top, along spiral Annular slab (2A) downward screw, vertical medicament adding tube (1A) add on the helical annular plate (2A) on different height position Adding medicine, ore pulp and medicament are discharged from the discharge port (2C) of lower part after evenly mixing, and into ore pulp buffer barrel (3), ore pulp is slow The ore pulp rushed in bucket (3) is conveyed by pipeline (3C), and pipe-line mixer (4) are arranged on the pipeline (3C) of conveying, further real The mixing of existing ore pulp and the medicament that flocculates.

3. a kind of slime water concentration processing system of three sections of underflow discharges according to claim 1, it is characterised in that: described Pipe-line mixer (4) be a cylindrical body, the arrangement multiple groups grizzly bar of its alternate internal, fluid flows through the increasing of grizzly bar turbulence level Add, realize the mixing of ore pulp and the medicament that flocculates, mixed ore pulp enters pan feeding buffering of three sections of discharging types without rake thickener (5) Room (5A1).

4. a kind of slime water concentration processing system of three sections of underflow discharges according to claim 1, it is characterised in that: described Three sections of discharging types pond body (5B) groups are concentrated by central segment concentration pond body (5A) and two side rooms sections without rake thickener (5) At；The center upper portion Position Design of central segment concentration pond body (5A) has pan feeding surge chamber (5A1), pan feeding surge chamber A piece agitating shaft (5A2) of central upper portion location arrangements of (5A1)；The agitating shaft (5A2) drives low speed rotation by motor (5A3) Turn, there is the agitator arm (5A4) of multilayer along agitating shaft (5A2) different vertical height design, the agitator arm (5A4) of multilayer is with stirring Axis (5A2) is mixed to be rotated together, the lower section of pan feeding surge chamber (5A1) connects a horn-like discharge barrel (5A5), it is horn-like go out Barrel (5A5) directly enters downwards in the high concentration floc sedimentation layer of the middle and lower part of central segment concentration pond body (5A), and solid particle stays in floc sedimentation In, it is deposited to the bottom of pond (5A6) of central segment concentration pond body；The bottom of pond (5A6) of the central segment concentration pond body is in high inclination-angle circular cone Then the bottom of pond (5A6) of shape, solid particles sediment to central segment concentration pond body gradually slides by self weight to center underflow opening (5A7), center underflow opening (5A7) are connect with Pulp pump (5A8), pass through the swabbing action discharge of Pulp pump (5A8)；Central segment is dense The overflow of contracting pond body (5A) by flowing to side room section concentration pond body with the shared trough rim (5A9) of side room section concentration pond body (5B) certainly (5B)；Side room section concentration pond body (5B) positioned proximate central section concentration pond body (5A) the arranged on left and right sides arrangement, arranged on left and right sides The structure of side room section concentration pond body (5B) is identical, and in high inclination-angle cone, material leans on certainly the bottom of pond (5B3) of side room section concentration pond body Weight gradually slides to side room underflow opening (5B4), and the material of side room underflow opening (5B4) is using the discharge inhaled on high lift pump (5B1) Mode is additionally provided with high pressure water pipe (5B2) on upper suction pipe road, is used for pipe dredging, the overflow water of side room section concentration pond body It is discharged from clean water overflow weir (5B5).