CN210302532U - Rake-free tailing concentration sand silo - Google Patents
Rake-free tailing concentration sand silo Download PDFInfo
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- CN210302532U CN210302532U CN201920751042.7U CN201920751042U CN210302532U CN 210302532 U CN210302532 U CN 210302532U CN 201920751042 U CN201920751042 U CN 201920751042U CN 210302532 U CN210302532 U CN 210302532U
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Abstract
The utility model relates to a no harrow selects dense sand silo of tailing, its purpose is solved prior art tailing concentrator structure complicacy, put sand concentration low and arrange the not smooth problem of material. Comprises a sand silo body, a flocculation feeding pipe, a central feeding barrel with a middle partition plate, a tailing feeding pipe, an overflow trough, an annular settling cone, a sliding frame fluidization device and a double-helix discharging device. By adopting the structural design, the flow field change of the material flow in the sand silo is changed, and the flocculation agglomeration speed of the fine particle tailings is accelerated; meanwhile, the smooth sand discharge under the condition of the highest underflow concentration is realized by adopting a mechanical carriage fluidization sand discharge technology. The utility model has the outstanding advantages of small volume, simple structure, low manufacturing cost, high concentration efficiency, high underflow concentration and the like.
Description
Technical Field
The utility model relates to a mine environmental protection equipment field, concretely relates to no harrow selects dense sand silo of tailing.
Background
In the mine industry, when concentrating and dewatering low-concentration tailings produced in the mineral separation production process, a deep cone thickener or a vertical sand silo with a rake frame is generally adopted. At the bottom of a thickener or a vertical sand silo, when the concentration of tailings reaches a certain value, the rheological property of slurry is in a non-Newtonian fluid characteristic, the yield stress is large, and smooth discharge is difficult to realize.
The thickener in the prior art generally adopts the mud scraping rake with a complex structure to destroy the yield stress so as to realize high-concentration ore drawing, and the discharging mode of the mud scraping rake has the problems of complex structure, high power consumption, high manufacturing cost, complex maintenance and the like; for tailings with high compactness, the hidden danger of pressing and raking also exists.
The vertical sand silo in the prior art generally adopts the technology of adding a nozzle at the bottom of the silo, adopting the local fluidization slurry making of a high-pressure water nozzle, the pneumatic slurry making or the air-water linkage slurry making and the like to realize the high-concentration discharge. The concentration of the discharged tailings can be reduced due to the local fluidization and pulp making of the high-pressure water spray nozzle; the pneumatic slurry making disturbs the sedimentation effect of tailings due to the rising of bubbles, so that the thickening rate is reduced; the gas-water linkage has the adverse effects of reducing the concentration of the discharged tailings and interfering the sedimentation of the tailings to reduce the concentration rate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a no harrow selection tailing dense sand silo is provided, realize that low concentration tailing carries out concentrated dehydration and discharges smoothly.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a rake-free tailings-selecting dense sand silo comprises a sand silo body, a flocculation feeding pipe, a central feeding barrel, a tailings feeding pipe, an overflow chute, an annular settling cone, a carriage fluidization device and a double-helix discharging device; the overflow groove is fixedly connected with the top of the side wall of the sand silo body; the central feeding barrel is arranged at the center of the top in the sand silo body and is fixedly connected with the sand silo body, the central feeding barrel is divided into an upper feeding area and a lower mixing area by an annular partition plate, the side wall of the mixing area is provided with at least one liquid outlet, the annular partition plate and the central feeding barrel are coaxially arranged and fixedly connected, and a gap is formed between the annular partition plate and the side wall of the central feeding barrel; the tailings feeding pipe is communicated with the feeding area; the flocculation feeding pipe is communicated with the mixing area; the annular sedimentation cone is arranged in the sand silo body and is positioned right below the central feeding barrel; the bottom wall of the sand silo body is provided with a discharge hole, and the carriage fluidization device is arranged in the sand silo body and is positioned above the discharge hole; the discharge port is provided with the double-helix discharging device.
The utility model has the advantages that: a rake-free tailings-selecting dense sand silo is a novel tailings dewatering and concentrating device. The device cancels the mud scraping rake and the transmission driving device thereof of the traditional thickener; the deep-cone dense sand silo is adopted, so that the tailings enter the sand silo and are automatically diluted into a concentration suitable for a flocculating agent to exert the best effect, and the concentration is fully mixed with the flocculating agent, a special flow field is formed in a central feeding barrel and the sand silo, and the gravity natural sedimentation of coarse particles and the flocculation and agglomeration sedimentation of fine-grained tailings are realized; the mechanical carriage fluidization discharging mode is adopted, the disturbing fluidization is carried out on the sand discharging area with large compaction density by the carriage fluidization device and the sand discharging area is pulled towards the discharging port on the premise of not reducing the concentration of the tailings and not influencing the thickening effect, so that the compaction density is reduced, and the effect of smooth sand discharging is achieved. The double-helix discharging device has the function of mutually cleaning adhered materials so as to prevent fine-fraction tailings with high viscosity from adhering to the screw shaft and not playing a role in conveying. The high-concentration tailing is smoothly discharged through the double-helix discharging device.
Specifically, the tailing feed pipe is used for transporting low-concentration tailing, and the flocculation feed pipe is a pipeline with one end communicated with a container filled with a flocculating agent.
Specifically, the overflow launder can be arranged inside or outside the sand silo body, and if the overflow launder is arranged inside, the overflow weir is lower than the top of the sand silo body; if set up externally, then sand silo body upper limb acts as the overflow weir, and the overflow launder lateral wall should be higher than sand silo body top this moment, and sets up a plurality of overflow hole at the lateral wall on sand silo body upper limb. No matter the overflow groove is arranged inside or outside the sand cabin body, a return pipe hole arranged at the bottom of the overflow groove is needed and communicated with an external supernatant liquid return pipe.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the tailing feeding pipe is connected with the central feeding barrel along the tangential direction of the central feeding barrel and communicated with the feeding area.
The beneficial effect of adopting the further scheme is that: when low-concentration tailings enter along the tangential direction of the central feeding barrel through the tailing feeding pipe, the material flow forms a rotating flow along the side wall of the central feeding barrel under the action of feeding pressure, and coarse particles in the material flow naturally settle along the side wall of the central feeding barrel under the action of rotating centrifugal force; the fine-grained tailings enter a mixing area at the lower part of the central feeding barrel through the center of the annular partition plate and are fully mixed with the flocculating agent flowing out of the flocculating feeding pipe arranged at the position, and then are flocculated and settled.
Furthermore, the central feeding barrel is in a cylindrical shape with an open top, and a conical structure with an upward conical top is arranged on the bottom wall.
The beneficial effect of adopting the further scheme is that: the conical structure is convenient for the fine-grained tailings and the flocculating agent to form vortex in the mixing process and prolong the mixing time, so that the mixing is more sufficient, the dispersing effect of the flocculating agent is ensured, the flocculating agent is favorable for the agglomeration of the fine-grained tailings, and the fine-grained tailings and the flocculating agent are discharged from the liquid outlet after being sufficiently mixed to start the agglomeration process.
Furthermore, the upper edge of the central feeding barrel is higher than the upper edge of the inner side of the overflow groove and is flush with the upper edge of the sand bin body, the top of the central feeding barrel is provided with a plurality of overflowing holes communicated with the sand bin body, the lower edges of the overflowing holes are lower than the upper edge of the inner side of the overflow groove, and the lower edges of the overflowing holes are higher than the tailings feeding pipe.
The beneficial effect of adopting the further scheme is that: set up the discharge orifice on central storage bucket, because the clear liquor that the feed concentration and the density of tailing pipe are higher than sand silo body upper portion can cause the liquid level of central storage bucket to be less than the liquid level of clear liquor, the clear liquor on sand silo body upper portion can flow into central storage bucket through the discharge orifice that sets up on central storage bucket upper portion this moment, play the dilution effect to the tailing for tailing concentration reaches the best concentration that the flocculating agent can exert best aggregation effect, strengthens the reunion effect of flocculating agent.
Further, the carriage fluidization device comprises a linear reciprocating driving device and a carriage, the linear reciprocating driving device is fixedly connected with the side wall of the sand bin body, the output end of the linear reciprocating driving device penetrates through the sand bin body and is fixedly connected with the carriage, and the carriage is horizontally arranged above the discharge port and horizontally and linearly reciprocates on the bottom wall of the sand bin body.
The beneficial effect of adopting the further scheme is that: the slide frame moves under the drive of the linear reciprocating driving device, continuously disturbs and fluidizes high-concentration materials near the discharge hole and scrapes the materials towards the discharge hole, the discharging efficiency is high, and blockage is avoided.
Further, the sliding frame is an oval frame with a grid structure in the middle, the length of the long axis of the oval frame is smaller than the diameter of the bottom of the sand silo body, and the sliding frame reciprocates along the direction of the short axis of the sliding frame; the grid structure comprises discharge cones and connecting rib plates which are arranged in a staggered mode, the discharge cones are perpendicular to the moving direction of the sliding frame, and the sections of the discharge cones are right-angled triangles.
The beneficial effect of adopting the further scheme is that: the sliding frame with the grid structure can greatly reduce the stress area and reduce the moving load; the oval structure of the sliding frame ensures that a certain movement space is formed in the sand silo body and no dead angle exists for material raking; when the right-angled triangle structure of the discharging cone can be guaranteed to move towards the discharging port, the vertical surface of the discharging cone can better scrape materials towards the discharging port, and the inclined surface effectively reduces the moving resistance.
Furthermore, the upper part of the sand silo body is in a cylindrical shape with an open top, the lower part of the sand silo body is in a conical cylinder shape with a downward conical top, and the conical angle of the conical cylinder shape is smaller than the angle of repose of the tailing slurry with the highest concentration.
The beneficial effect of adopting the further scheme is that: the design of the lower cone of the experimental repose angle of the tailings with the concentration less than the highest concentration is adopted, so that the sagging force of the tailings is greater than the adhesive force between the tailings and the inner wall of the cone, the possibility of arching caused by the accumulation of the tailings on the inner wall of the cone is avoided, and the smooth blanking and discharging are ensured.
Specifically, the repose angle, also called the angle of repose, is the minimum angle between the horizontal surface and the object placed on the inclined surface when the inclined surface is in the critical state of sliding down along the inclined surface (i.e., the object on the inclined surface is more likely to slide down as the inclination angle increases; when the object reaches the state of starting sliding down, the angle in the critical state is called the angle of repose).
Furthermore, the annular settlement cone is of an annular structure and is provided with an inner inverted conical surface and an outer regular conical surface, the inner inverted conical surface is connected with the top of the outer regular conical surface, the included angle is 60 degrees, and the top of the annular settlement cone is correspondingly arranged below the liquid outlet.
The beneficial effect of adopting the further scheme is that: firstly, the flocculation sedimentation area of the sand silo body is increased, and the sedimentation effect is enhanced; secondly, a flow field with concentration difference is formed by utilizing the aggregation and slippage effects of the tailings on the inner conical surface and the outer conical surface, and the rising of clarified liquid and the sedimentation of flocs are accelerated.
Further, still include the decompression awl, the decompression awl set up in the sand silo and be located the top of balladeur train fluidizer, the decompression awl correspond set up in interior inverted cone face below.
The beneficial effect of adopting the further scheme is that: the pressure reducing cone can reduce the stress area of the sliding frame, and effectively reduce the pressure of the high-concentration accumulated tailings on the lower part of the sand silo body and the sliding frame fluidization device.
Further, still including setting up the annular fluidization pipe at sand silo body lower part cone outer wall, the external water source that has certain pressure of annular fluidization pipe, sand silo body cone inner wall fixedly connected with a plurality of fluidization mouths.
The beneficial effect of adopting the further scheme is that: when the rake-free tailings dense sand silo stops discharging for a period of time, then discharging is started, high-concentration tailings accumulated on the inner conical surface of the sand silo body can generate large yield stress, and at the moment, clear water is pumped into the annular pipe and is delivered through the one-way nozzle at the end part in the sand silo body, so that the yield stress of the tailings accumulated on the inner conical surface of the sand silo body is broken, and the effect of smooth discharging is further achieved. It should be noted that, after the smooth discharge can be realized, the pumping of water can be stopped to ensure that the tailings are maintained in a higher concentration range.
Specifically, the fluidization nozzle is a one-way fluidization nozzle.
Drawings
FIG. 1 is a schematic structural view of a rakeless tailings-selecting dense sand silo of the present invention;
FIG. 2 is a cross-sectional view of the carriage fluidization device of the rakeless tailings-selecting dense sand silo of the present invention;
FIG. 3 is a side view of the rakeless tailings-selecting dense sand silo of the present invention;
FIG. 4 is a top view of the carriage fluidization device of the rakeless tailings-dressing dense sand silo of the present invention;
FIG. 5 is a front view of a central feeding barrel of the rakeless tailings-selecting dense sand silo of the utility model;
fig. 6 is a top view of the central feeding barrel of the rakeless tailings-selecting dense sand silo of the utility model.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a flocculation feeding pipe, 2 a central feeding barrel, 201 an annular partition plate, 202 an overflowing hole, 3 a tailing feeding pipe, 4 an overflow groove, 5 an annular settling cone, 6 a sand cabin body, 7 a pressure reducing cone, 8 an annular fluidizing pipe, 9 a sliding frame fluidizing device, 10 a double-helix discharging device, 11 a liquid outlet pipe, A and an overflow area, B and a settling area, C and a compression area, D and a storage area.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 5, a rakeless tailings concentration sand silo comprises a sand silo body 6, a flocculation feeding pipe 1, a central feeding barrel 2, a tailings feeding pipe 3, an overflow launder 4, an annular sedimentation cone 5, a carriage fluidization device 9 and a double helix discharging device 10;
the overflow groove 4 is fixedly connected with the top of the side wall of the sand silo body 6;
the central feeding barrel 2 is arranged at the top center in the sand cabin body 6 and is fixedly connected with the sand cabin body 6, the central feeding barrel 2 is divided into an upper feeding area and a lower mixing area by an annular partition plate 201, the side wall of the mixing area is provided with at least one liquid outlet, the annular partition plate 201 and the central feeding barrel 2 are coaxially arranged and fixedly connected, and a gap is formed between the annular partition plate 201 and the side wall of the central feeding barrel 2;
the tailings feeding pipe 3 is communicated with the feeding area;
the flocculation feeding pipe 1 is communicated with the mixing area;
the annular sedimentation cone 5 is arranged in the sand cabin body 6 and is positioned right below the central feeding barrel 2;
the bottom wall of the sand silo body 6 is provided with a discharge hole, and the carriage fluidization device 9 is arranged in the sand silo body 6 and is positioned above the discharge hole;
the discharge hole is provided with the double-helix discharging device 10.
Specifically, two spiral delivery axles have in double helix discharge device 10's the casing, two the blade of spiral delivery axle overlaps with the projection part on the axis vertically face, double helix discharge device 10's casing has feed inlet and bin outlet, the feed inlet with the sand storehouse body 1 be linked together of discharge gate, double helix discharge device 10 with the bottom fixed connection of the sand storehouse body 1.
Specifically, the central feeding barrel 2 is connected with the inner wall of the sand cabin body 1 through a steel structure bracket; the annular sedimentation cone 5 is connected with the inner wall of the sand cabin body 1 through a steel structure bracket; annular baffle 201 passes through steel structural support and 2 inner walls fixed connection of central feed bucket and coaxial setting. The annular partition 201 is a circular plate, that is, the annular partition 201 is a circular plate with a through hole at the center, the outer diameter of the annular partition 201 is smaller than the inner diameter of the central feeding barrel 2, and a gap is formed between the outer side of the annular partition 201 and the central feeding barrel 2.
Specifically, the annular settlement cone 5 is an annular structure with an inverted V-shaped cross section.
Specifically, the double-helix discharging device 10 is connected and communicated with the discharge hole of the sand silo body 1 through a flange. The double helix discharging device 10 is driven by a rotary driving device. The end parts of the two spiral conveying shafts are respectively and fixedly connected with a pair of gears which are meshed with each other, and the output end of the rotary driving device is fixedly connected with one of the spiral conveying shafts. The rotary driving device drives the two spiral conveying shafts to rotate reversely. The rotary drive may be an electric or hydraulic motor, or other rotary drive.
Specifically, the overflow groove 4 is an annular groove body with a U-shaped cross section.
As a further solution of this embodiment, the tailings feeding pipe 3 is connected to the central feeding barrel 2 along the tangential direction of the central feeding barrel 2, and is communicated with the feeding area.
As a further solution of this embodiment, the central feeding barrel 2 is a cylindrical barrel with an open top, and a conical structure with an upward conical top is provided on the bottom wall.
As a further scheme of this embodiment, the upper edge of the central feeding barrel 2 is higher than the upper edge of the inner side of the overflow launder 4 and is flush with the upper edge of the sand silo body 6, the top of the central feeding barrel 2 is provided with a plurality of overflowing holes 202 communicated with the sand silo body 6, the lower edge of the overflowing holes 202 is lower than the upper edge of the inner side of the overflow launder 4, and the lower edge of the overflowing holes 202 is higher than the tailings feeding pipe 3.
Specifically, in this embodiment, the central feeding barrel 2 may also be: the upper edge of the central charging basket 2 is lower than the upper edge of the inner side of the overflow launder 4, and the side wall of the central charging basket 2 has no overflow holes 202. The supernatant liquid at the top can enter the central feed barrel 2 from the upper part of the central feed barrel 2. The preferred scheme in this example is: the upper edge of the central feeding barrel 2 is higher than the upper edge of the inner side of the overflow groove 4, and the side wall of the central feeding barrel is provided with an overflowing hole 202, so that the overflowing hole 202 can limit the flow of clarified liquid entering the central feeding barrel 2, the excessive clarified liquid is prevented from entering the central feeding barrel 2, and the concentration of tailings in the central feeding barrel 2 is maintained in a range suitable for flocculation and sedimentation.
As a further scheme of this embodiment, the carriage fluidization device 9 includes a linear reciprocating driving device and a carriage, the linear reciprocating driving device is fixedly connected with the side wall of the sand silo body 6, an output end of the linear reciprocating driving device is inserted into the sand silo body 6 and is fixedly connected with the carriage, and the carriage is horizontally arranged above the discharge port and horizontally and linearly reciprocates on the bottom wall of the sand silo body 6.
Specifically, as shown in fig. 1 and 2, the linear reciprocating driving device may be a hydraulic cylinder, an air cylinder, or a linear motor. The side wall of the sand silo body 6 is provided with a mounting hole, a cylinder body or a motor shell of the linear reciprocating driving device is arranged in the mounting hole in a penetrating mode and fixedly connected with the mounting hole, a sealing seat is further arranged between the cylinder body or the motor shell of the linear reciprocating driving device and the mounting hole, and a driving rod of the linear reciprocating driving device is fixedly connected with the sliding frame to drive the sliding frame to move in a reciprocating mode.
As a further scheme of the embodiment, the carriage is an elliptical frame with a grid structure in the middle, the length of the long axis of the elliptical frame is smaller than the diameter of the bottom of the sand silo body 6, and the carriage reciprocates along the direction of the short axis of the carriage; the grid structure comprises discharge cones and connecting rib plates which are arranged in a staggered mode, the cross sections of the discharge cones are right-angled triangles, and the vertical surfaces of the discharge cones face the short shaft of the sliding frame.
Specifically, the discharging device comprises at least two discharging cones, at least one discharging cone is positioned on one side of the long shaft of the sliding frame, at least one discharging cone is positioned on the other side of the long shaft of the sliding frame, and the hypotenuse of the right triangle faces to the side far away from the long shaft of the sliding frame.
Specifically, the discharge cone and the connecting rib plate are perpendicular to each other and fixedly connected with each other, the two ends of the discharge cone are fixedly connected with the inner wall of the oval frame, and the two ends of the connecting rib plate are fixedly connected with the inner wall of the oval frame.
Specifically, one of the right-angled sides of the right-angled triangle is horizontally arranged and is in contact with the bottom wall of the sand silo body 6, and the other right-angled side of the right-angled triangle is vertically arranged and faces the long axis of the sliding frame.
As a further scheme of this embodiment, the upper portion of the sand silo body 1 is a cylindrical barrel shape with a closed top, and the lower portion is a conical barrel shape with a downward conical top, and a cone angle of the conical barrel shape is smaller than a repose angle of tailings.
As a further scheme of this embodiment, the annular settlement cone 5 is of an annular structure and has an inner inverted conical surface and an outer forward conical surface, the inner inverted conical surface is connected with the top of the outer forward conical surface, the included angle is 60 °, and the top of the annular settlement cone 5 is correspondingly arranged below the liquid outlet.
Specifically, still include at least one drain pipe 11, the one end of drain pipe 11 with the outside fixed connection and the intercommunication of liquid outlet, the annular subsides the top of awl 5 with the other end center department of drain pipe 11 corresponds the setting. Specifically, drain pipe 11 is a plurality of, the liquid outlet is a plurality of, and is a plurality of drain pipe 11 is followed radial setting of central feed bucket 2 is a plurality of the center of the other end of drain pipe 11 is located same circumference, the circumference is coaxial with central feed bucket 2, the annular is subsided awl 5 and is set up with central feed bucket 2 is coaxial, and the diameter that the conical top was subsided to the annular is with a plurality of the diameter of the circumference that the center of the other end of drain pipe 11 formed is the same.
As a further proposal of the embodiment, the sand silo further comprises a decompression cone 7, the decompression cone 7 is arranged in the sand silo body 6 and is positioned above the carriage fluidization device 9, and the decompression cone 7 is correspondingly arranged below the inner inverted cone surface.
Specifically, the decompression cone 7 is a hollow cone shell with a cone angle a of 60 degrees, and the diameter of the bottom of the cone is half of the diameter of the bottom of the sand silo body 6.
As a further scheme of this embodiment, the sand silo further comprises an annular fluidizing pipe 8, the annular fluidizing pipe 8 is externally connected with a water source, a plurality of fluidizing nozzles are fixedly connected to a side wall of the annular fluidizing pipe 8, the annular fluidizing pipe 8 is sleeved on the outer side of a cone at the lower part of the sand silo body 6, and the fluidizing nozzles are communicated with the inside of the sand silo body 6.
Specifically, 8 lateral walls of annular fluidization pipe have the water inlet, still include the water pump, the water inlet of water pump is linked together through the pipeline with outside water tank through the pipeline, the delivery port of water pump with the water inlet is linked together through the pipeline, when needing to add water to the sand silo body 6, the water pump is with the water in the water tank through fluidization mouth pump income sand silo body 6.
Specifically, the fluidization nozzle is a one-way fluidization nozzle.
Specifically, the number of the annular fluidization pipes 8 is at least one, and the at least one annular fluidization pipe 8 is arranged on the outer side of the lower cone of the sand silo body 6 in parallel.
The sand silo further comprises supporting legs, and the supporting legs are fixedly connected with the outer wall of the sand silo body 1. For supporting and fixing the sand silo body 1.
After the low-concentration tailings enter the dense sand silo for a certain time, an overflow area A, a settling area B, a compression area C and a storage area D are naturally formed in the sand silo from top to bottom.
The overflow area A is a micro-particle suspension (clarified liquid) gathering area which is not flocculated and settled and escapes, and the mass concentration of the overflow area A is basically equal to that of clear water; the sedimentation zone B is a main zone for quickly settling coarse-particle tailings and flocculating and agglomerating fine particles; in the compression zone C, the fine particles basically complete flocculation and agglomeration and generate vertical sedimentation together with coarse particle tailings; in the storage area D, the naturally gravity settled coarse fraction tailings and the flocculated and agglomerated settled fine fraction tailings are mutually superposed to form a compressed layer of solid particles, and in the area, the settling velocity becomes very small, and the solid particles are mutually contacted, supported and extruded. The upper layer solid particles generate compression action on the lower layer solid, so that water in gaps among the lower layer solid particles is extruded and ascended, the contact stress of the solid is rapidly increased from top to bottom, and the solid concentration gradually reaches the maximum.
The utility model discloses a dense sand silo that special structural design constitutes makes low concentration tailing and the flocculating agent that gets into central storage bucket 2 produce the flow field that does benefit to the flocculation agglomeration in this sand silo body, and the vortex that produces through the concentration difference and the velocity difference in this flow field interferes, causes to play the environment that promotes and accelerate the effect to the granule, promotes the combination of fine particle and flocculating agent and the flocculation agglomeration between the fine particle to grow up.
The low-concentration tailings enter the central feeding barrel 2 through the tailings feeding pipe 3 and then enter the feeding area along the tangential direction of the side wall of the central feeding barrel 2. In the feeding area, the coarse fraction tailings realize gravity settling along the side wall of the central feeding barrel 2 by means of the centrifugal force of feeding; the low-concentration tailings enter a mixing area at the lower part of the central feeding barrel 2 through a through hole at the center of the annular partition plate 201, are fully mixed with the flocculating agent flowing out from the mixing area, and then are settled. And discharging the flocculated tailings from a liquid outlet. Further divided by an annular sedimentation cone 5 positioned at the lower part of the central feeding barrel 2 to form material flows with higher mass concentration and flow velocity distributed on the inner and outer conical surfaces of the annular sedimentation cone 5.
Correspondingly, in other sedimentation zone B areas far away from the outer conical surface of the annular sedimentation cone 5, the mass concentration and the flow velocity of tailings are low, so that the flow velocity difference is generated, and a vortex flow field is generated. The vortex flow field accelerates the movement rate of the fine particle tailings, so that interference is generated between particles in the sedimentation process, and the effects of promoting the combination of fine particles and a flocculating agent and the agglomeration and growth of the fine particles are achieved. Meanwhile, the concentration of solid in the settling zone B is low, solid particles quickly drop, interference is generated between particles in the settling process, and the effect of promoting the micro-particles to agglomerate and grow so as to accelerate the settling is also achieved.
In the space outside the central feeding barrel 2 at the upper part of the sand silo body 6, the ascending low-concentration micro-particles naturally form a suspension aggregation area, which is beneficial to flocculation and agglomeration of a flocculating agent and the micro-particles, and the agglomerated flocculent tailings naturally settle and slide to the annular settling cone 5 by the gravity of the agglomerated flocculent tailings and continue to settle. The flow field formed by the different concentrations in the process accelerates the flow exchange process, so that the concentration process of the tailings is accelerated.
In a compression area C and a storage area D from the lower part of the annular sedimentation cone 5 to the bottom of the sand silo body, the naturally gravity settled coarse fraction tailings and the flocculated and settled fine fraction tailings are mutually superposed to form a compression layer of solid particles, and in the area, the sedimentation velocity becomes very small, and the solid particles are mutually contacted, supported and extruded. The upper layer solid particles generate compression action on the lower layer solid, so that water in gaps among the lower layer solid particles is extruded and ascended, the contact stress of the solid is rapidly increased from top to bottom, and the solid concentration gradually reaches the maximum.
A portion of the clarified liquid in overflow area a passes along overflow aperture 202 into central feedwell 2. The feeding of the low-concentration turbid liquid further dilutes the feeding materials in the central feeding barrel 2, so that the sedimentation of the tailings is closer to natural sedimentation, and the sedimentation speed is increased. And the other part of the clarified liquid in the overflow area A enters the overflow groove and is discharged through the overflow holes on the side wall of the sand silo body.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. indicate the orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A rakeless tailings-selecting dense sand silo is characterized by comprising a sand silo body (6), a flocculation feeding pipe (1), a central feeding barrel (2), a tailings feeding pipe (3), an overflow trough (4), an annular sedimentation cone (5), a carriage fluidization device (9) and a double-helix discharging device (10);
the overflow groove (4) is fixedly connected with the top of the side wall of the sand cabin body (6);
the central feeding barrel (2) is arranged at the top center in the sand cabin body (6) and is fixedly connected with the sand cabin body (6), the central feeding barrel (2) is divided into an upper feeding area and a lower mixing area by an annular partition plate (201), the side wall of the mixing area is provided with at least one liquid outlet, the annular partition plate (201) and the central feeding barrel (2) are coaxially arranged and fixedly connected, and a gap is formed between the annular partition plate (201) and the side wall of the central feeding barrel (2);
the tailings feeding pipe (3) is communicated with the feeding area;
the flocculation feeding pipe (1) is communicated with the mixing area;
the annular sedimentation cone (5) is arranged in the sand cabin body (6) and is positioned right below the central feeding barrel (2);
the bottom wall of the sand silo body (6) is provided with a discharge hole, and the carriage fluidization device (9) is arranged in the sand silo body (6) and is positioned above the discharge hole;
the discharge hole is provided with the double-helix discharging device (10).
2. The rakeless tailings concentrate sand silo according to claim 1, wherein the tailings feeding pipe (3) is connected to the central feeding barrel (2) in a tangential direction of the central feeding barrel (2) and is communicated with the feeding area.
3. The rakeless tailings thickening sand silo according to claim 1, wherein the central feeding barrel (2) is in a cylindrical barrel shape with an open top, and a conical structure with an upward conical top is arranged on the bottom wall.
4. The rakeless tailings thickener sand silo according to claim 1, wherein the upper edge of the central feeding barrel (2) is higher than the upper edge of the inner side of the overflow chute (4) and is flush with the upper edge of the sand silo body (6), the top of the central feeding barrel (2) is provided with a plurality of overflowing holes (202) communicated with the sand silo body (6), the lower edge of the overflowing holes (202) is lower than the upper edge of the inner side of the overflow chute (4), and the lower edge of the overflowing holes (202) is higher than the tailings feeding pipe (3).
5. The rakeless tailings thickening sand silo according to claim 1, wherein the carriage fluidization device (9) comprises a linear reciprocating driving device and a carriage, the linear reciprocating driving device is fixedly connected with the side wall of the sand silo body (6), the output end of the linear reciprocating driving device is arranged in the sand silo body (6) in a penetrating mode and is fixedly connected with the carriage, and the carriage is horizontally arranged above the discharge port and moves horizontally and linearly on the bottom wall of the sand silo body (6).
6. The rakeless tailings thickening sand silo according to claim 5, wherein the carriage is an elliptical frame with a grid structure in the middle, and the carriage reciprocates along the direction of the short axis of the carriage; the grid structure comprises discharge cones and connecting rib plates which are arranged in a staggered mode, the discharge cones are perpendicular to the moving direction of the sliding frame, and the sections of the discharge cones are right-angled triangles.
7. The rakeless tailings thickening sand silo according to claim 1, wherein the sand silo body (6) is in a cylindrical barrel shape with an open top at the upper part, and is in a conical barrel shape with a downward conical top at the lower part, and the cone angle of the conical barrel shape is smaller than the repose angle of tailings.
8. The rakeless tailings concentration sand silo according to claim 1, wherein the annular settling cone (5) is of an annular structure and is provided with an inner inverted conical surface and an outer regular conical surface, the top of the inner inverted conical surface is connected with the top of the outer regular conical surface, the included angle is 60 degrees, and the top of the annular settling cone (5) is correspondingly arranged below the liquid outlet.
9. The rakeless tailings thickening sand silo according to claim 8, further comprising a pressure reduction cone (7), wherein the pressure reduction cone (7) is arranged in the sand silo body (6) and above the carriage fluidization device (9), and the pressure reduction cone (7) is correspondingly arranged below the inner inverted cone surface.
10. The rakeless tailings thickening sand silo according to any one of claims 1 to 9, further comprising an annular fluidization pipe (8), wherein the annular fluidization pipe (8) is externally connected with a water source, the side wall of the annular fluidization pipe is fixedly connected with a plurality of fluidization nozzles, the annular fluidization pipe (8) is sleeved outside the lower part of the sand silo body (6), and the fluidization nozzles are communicated with the inside of the sand silo body (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920751042.7U CN210302532U (en) | 2019-05-23 | 2019-05-23 | Rake-free tailing concentration sand silo |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920751042.7U CN210302532U (en) | 2019-05-23 | 2019-05-23 | Rake-free tailing concentration sand silo |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110152359A (en) * | 2019-05-23 | 2019-08-23 | 金诚信矿山工程设计院有限公司 | A kind of no rake selects the dense sand warehouse of tailing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110152359A (en) * | 2019-05-23 | 2019-08-23 | 金诚信矿山工程设计院有限公司 | A kind of no rake selects the dense sand warehouse of tailing |
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