CN210302533U - Dense sand silo with scraper fluidizing device - Google Patents
Dense sand silo with scraper fluidizing device Download PDFInfo
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- CN210302533U CN210302533U CN201920751073.2U CN201920751073U CN210302533U CN 210302533 U CN210302533 U CN 210302533U CN 201920751073 U CN201920751073 U CN 201920751073U CN 210302533 U CN210302533 U CN 210302533U
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Abstract
The utility model relates to a dense sand silo with a scraper fluidization device, which comprises a sand silo body with a cavity, a feeding pipe, an overflow chute, a feeding well, a circulating well, an annular diversion cone, a central decompression cone and a scraper fluidization device; the overflow groove is fixedly connected with the top of the inner wall of the sand bin body; the feeding well is sleeved at the center of the top of the cavity; the circulating well is sleeved in the feeding well; the feeding pipe is communicated with the feeding well; the annular diversion cone is arranged right below the circulating well; the central decompression cone is arranged above the discharge hole; the scraper fluidization device comprises a scraper, a rotary support and a driving device, wherein the bottom surface of the scraper is in contact with the inner side of the bottom wall. By adopting the structure design, the utility model accelerates the flocculation and agglomeration speed of the fine particle tailings by changing the flow field change of the material flow in the dense sand silo; meanwhile, the primary high-concentration discharge is realized by adopting a scraper fluidization sand discharge technology.
Description
Technical Field
The utility model relates to a mine trade solid waste selects tailing to deal with technical field, concretely relates to dense sand silo with scraper fluidizer.
Background
The mine industry generally adopts a thickener or a vertical sand silo when concentrating and dehydrating tailings produced in the mineral separation production process. At the bottom of a thickener or a vertical sand silo, when the concentration of particles reaches a certain value, the settled high-concentration tailings have higher compaction density, so that the problem of unsmooth sand release is caused.
Common thickeners generally adopt a mud scraper with a complex structure to realize high-concentration ore drawing; the vertical sand silo is additionally provided with a nozzle at the bottom of the silo, and the fluidization discharge of high-concentration slurry is realized by adopting the technologies of local fluidization slurry making of a high-pressure water nozzle, pneumatic slurry making, air-water linkage slurry making and the like.
The above-mentioned several fluidization slurry-making methods have many disadvantages: the mud scraping rake type thickener has a complex structure and high manufacturing cost, and has hidden danger of rake pressing during operation; 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 air bubble rises to interfere the natural sedimentation effect of the tailings in the pneumatic slurry making process, so that the thickening rate is reduced; the slurry making by the air-water linkage has the adverse effects of reducing the concentration of the discharged tailings and interfering the natural sedimentation of the tailings to reduce the concentration rate.
For the reasons, the sand silo structure which does not reduce the mortar concentration and does not influence the thickening efficiency during sand discharging is an urgent problem to be solved in the application of a thickener or a vertical sand silo.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a dense sand silo with scraper fluidizer is provided, neither reduce mortar concentration nor influence dense efficiency.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a dense sand silo with a scraper fluidization device comprises a sand silo body with a cavity, a feeding pipe, an overflow chute, a feeding well, a circulating well, an annular diversion cone, a central decompression cone and the scraper fluidization device; the bottom of the sand silo body is fixedly connected with a conical silo bottom, the side wall of the conical silo bottom is conical, the bottom wall of the conical silo bottom is a plane, and a discharge hole is formed in the center of the bottom wall; the overflow groove is fixedly connected with the top of the inner wall of the sand bin body; the feeding well is sleeved at the center of the top of the cavity of the sand cabin body and is fixedly connected with the sand cabin body; the circulating well is sleeved in the feeding well and fixedly connected with the top of the feeding well, and a feeding area is formed between the feeding well and the circulating well; said feed tube communicating with said feed zone; the annular diversion cone is arranged right below the circulating well and is fixedly connected with the inner wall of the sand cabin body, and the diameter of the top of the annular diversion cone is the same as that of the circulating well; the central decompression cone is arranged above the discharge hole and is connected with the inner wall of the conical bin bottom; the scraper fluidizing device comprises a scraper, a slewing bearing and a driving device, the scraper is fixedly connected with the slewing bearing, the slewing bearing is connected with the driving device through a transmission mechanism, the bottom surface of the scraper is contacted with the inner side of the bottom wall, and the scraper is driven by the driving device to rotate on the bottom wall in a circulating mode by taking the center of the discharge hole as a rotation center.
The utility model has the advantages that: by adopting the structural design, the flocculation and agglomeration speed of the fine particle tailings is accelerated by changing the flow field change of the material flow in the dense sand silo; meanwhile, the primary high-concentration discharge is realized by adopting a scraper fluidization sand discharge technology. Compared with the existing tailing dewatering technology, the method has the following advantages: no water and air consumption, good fluidization effect, no reduction of mortar concentration and no reduction of thickening effect. The central pressure reducing cone can solve the problem of high compacted density of the tailings at the bottom of the sand silo body, optimize the stress condition of the silo bottom and reduce the power consumption of the scraper fluidization device; the scraper scrapes the high-concentration sedimentary tailings with higher compaction density to a central discharge hole and discharges the sedimentary tailings out of the sand bin.
Specifically, a flocculant-containing medicine storage tank outside the device is communicated with a feeding pipe through a pipeline, and the flocculant and tailings enter a feeding area through the feeding pipe.
Specifically, the side wall of the sand bin body is provided with an overflow hole corresponding to the overflow groove, and the overflow groove is communicated with a supernatant collecting pipeline through the overflow hole; or comprises a supernatant liquid return pipe fixedly arranged on the side wall of the sand silo body in a penetrating way, the overflow trough is communicated with the supernatant liquid return pipe, and the supernatant liquid return pipe is communicated with a supernatant liquid collecting pipeline. The supernatant liquid reflux pipeline is communicated with an external supernatant liquid collecting tank.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the central decompression cone is a conical shell, and a through hole is formed in the top of the central decompression cone.
The beneficial effect of adopting the further scheme is that: the drained water of the materials at the bottom of the sand silo flows back to the upper part through the low-pressure area inside the central decompression cone, so that the concentration of the solid at the bottom is increased.
Further, the taper angle of the central pressure relief cone is no greater than 60 °.
The beneficial effect of adopting the further scheme is that: the accumulation of tailings on the conical surface of the central decompression cone is avoided, and the material is effectively distributed while the impact force of the material is relieved.
Further, the scraper is provided with at least two blades, and one end of each blade, which is far away from the rotation center, is tangent to the inner side wall of the conical bin bottom.
The beneficial effect of adopting the further scheme is that: the method can effectively prevent the tailings from being consolidated and deposited in the dense sand silo, effectively solve the problems of arch erection and cavities of the settled slurry, and ensure uniform and stable discharge.
In particular, at least two of said blades are uniformly distributed over the circumference of rotation thereof.
Furthermore, the upper part of the feeding well is a cylindrical barrel, the lower part of the feeding well is a circular truncated cone-shaped barrel, and the upper end surface of the feeding well is flush with the upper end surface of the overflow groove.
The feeding well has the beneficial effects that the liquid level height difference generated by the specific gravity difference of the materials inside and outside the feeding well is utilized to enable the supernatant to overflow to the inside of the feeding well, so that the fed materials in the feeding well are diluted, and the flocculating agent is easier to flocculate and agglomerate with the low-concentration tailings in the environment with proper concentration.
Further, still include sand discharging funnel, sand discharging funnel's upper end with the toper bottom of the storehouse is connected, sand discharging funnel with the discharge gate is linked together.
The beneficial effect of adopting the further scheme is that: the discharge port is communicated with a discharge pipeline through a sand discharge funnel, so that the tailing is convenient to collect.
Further, the cone angle of the sand discharging funnel is smaller than the repose angle of the tailings.
The beneficial effect of adopting the further scheme is that: the design that the cone angle is smaller than the repose angle of the tailings can effectively avoid the tailings from arching.
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).
Further, the inlet pipe includes two at least branch material pipes, divide the material pipe respectively with the inlet pipe is linked together, divide the inlet pipe to follow the tangential direction of feedwell with the feedwell intercommunication.
The beneficial effect of adopting the further scheme is that: the material enters the feeding well from the tangential direction along the feeding pipe.
Further, the upper portion of circulation well is the cylindric barrel, and the lower part is the barrel of round platform shape, the diameter of circulation well bottom is equal with the diameter at annular water conservancy diversion awl top.
The beneficial effect of adopting the further scheme is that: the material falls from the feeding area, falls along the outer wall of the circulating well at the inner side, falls to the top of the annular diversion cone, and is distributed by the annular diversion cone to form material flows with high mass concentration and flow rate, wherein the material flows are distributed on the inner conical surface and the outer conical surface of the annular diversion cone.
Further, annular water conservancy diversion awl is including a just awl section of thick bamboo and a back taper section of thick bamboo, a just awl section of thick bamboo cup joints outside the back taper section of thick bamboo, and the top fixed connection of each other, a just awl section of thick bamboo has the external cone face, a back taper section of thick bamboo has an internal conical surface, internal conical surface with the contained angle of external cone face is 60.
The beneficial effect of adopting the further scheme is that: the reposition of redundant personnel is effectual, avoids the material to pile up.
Specifically, the annular guide cone is a shell structure with an inner conical surface and an outer conical surface.
The sand silo further comprises supporting legs, and the supporting legs are fixedly connected with the outer wall of the sand silo body. The installation and the fixation of the sand silo body are convenient.
The utility model discloses still have following advantage:
the structure of the thickener is simplified, and the manufacturing cost of the thickener is reduced;
secondly, a pulping mode influencing the ore drawing concentration and thickening effect of the underflow of a thickener or a vertical sand silo is eliminated, and high-concentration discharge of tailings is realized;
and thirdly, the problem of high tailing compaction density at the bottom of the thickener or the vertical sand silo is solved through the central decompression cone, the stress condition of the silo bottom is optimized, and the power consumption of the sand discharging device is reduced.
Drawings
Fig. 1 is a schematic structural view of a dense sand silo with a scraper fluidization device of the utility model;
fig. 2 is a top view of a scraper of a dense sand silo with a scraper fluidization device according to the present invention;
fig. 3 is a partial enlarged view of the slewing bearing of the dense sand silo with the scraper fluidization device of the utility model.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the sand silo body, 2, overflow launder, 3, feeding well, 4, circulation well, 5, annular flow guide cone, 6, conical silo bottom, 7, central decompression cone, 8, scraper, 9, rotary disk, 10, fixed chassis, 11, driving device, 12, sand discharge funnel, 13, supporting leg, 14, slewing bearing, 15, gate valve, A, clarification area, B, transition area, C, settlement area, D, compression 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, a dense sand silo with a scraper fluidization device comprises a sand silo body 1 with a cavity, a feeding pipe, an overflow chute 2, a feeding well 3, a circulating well 4, an annular diversion cone 5, a central decompression cone 7 and a scraper fluidization device; the bottom of the sand silo body 1 is fixedly connected with a conical silo bottom 6, the side wall of the conical silo bottom 6 is conical, the bottom wall is a plane, and a discharge hole is formed in the center of the bottom wall; the overflow groove 2 is fixedly connected with the top of the inner wall of the sand silo body 1, and the overflow groove 2 is communicated with a supernatant return pipe; the feeding well 3 is sleeved at the center of the top of the cavity of the sand cabin body 1 and is fixedly connected with the sand cabin body 1; the circulating well 4 is sleeved in the feeding well 3 and is fixedly connected with the top of the feeding well 3, and a feeding area is formed between the feeding well 3 and the circulating well 4; said feed tube communicating with said feed zone; the annular diversion cone 5 is arranged right below the circulating well 4 and is fixedly connected with the inner wall of the sand silo body 1, and the diameter of the top of the annular diversion cone 5 is the same as that of the circulating well 4; the central decompression cone 7 is arranged above the discharge hole and is connected with the inner wall of the conical bin bottom 6; the scraper fluidizing device comprises a scraper 8, a slewing bearing 14 and a driving device 11, wherein the scraper 8 is fixedly connected with the slewing bearing 14, the slewing bearing 14 is connected with the driving device 11 through a transmission mechanism, the bottom surface of the scraper 8 is contacted with the inner side of the bottom wall, and the scraper 8 is driven by the driving device 11 to rotate on the bottom wall in a circulating manner by taking the center of the discharge hole as a rotation center.
Specifically, the sand cabin body 1 is cylindrical with the top closed, the sand cabin body 1 is fixedly connected with the conical cabin bottom 6 through bolts, and a sealing gasket is clamped between the joint of the sand cabin body 1 and the conical cabin bottom 6.
Specifically, a feed well 3 and a circulating well 4 which are arranged at the center of the upper part of the sand silo body 1 are connected and fixed on the inner wall of the sand silo body 1 through a steel structure bracket.
Specifically, the annular diversion cone 5 is fixedly connected with the sand cabin body 1 through a steel structure support at the lower part of the circulating well 4.
Specifically, a central decompression cone 7 above the discharge hole is connected with the inner wall of a cone-shaped bin bottom 6 through a steel structure support.
Specifically, the scraper flow state device comprises a fixed chassis 10 provided with a rotary support 14, a cylindrical rotary disk 9 provided with a pair of crab claw-shaped scrapers 8 and fixed on the rotary support 14, and a driving device 11, wherein the fixed chassis 10 is positioned at the bottom of the conical bin bottom 6 and fixed on the bottom of the conical bin bottom 6 by bolts, the inner ring of the slewing bearing 14 is fixed on the fixed chassis 10 by bolts, the scraper 8 is fixedly connected with the inner wall of the slewing disc 9 by bolts, the slewing disc 9 is fixed on the outer ring of the slewing bearing 14 by bolts, the driving device 11 is fixed at the bottom of the fixed chassis 10 by bolts, a pinion arranged on an output shaft of the driving device 11 is meshed with a gear on the outer ring of the slewing bearing 14 so as to transmit power to the scraper 8 arranged on the slewing bearing, the driving device can be an electric motor, a hydraulic motor or other power devices for driving rotation. The rotary disk 9 is cylindrical, the fixed chassis 10 is cylindrical in a stepped shape, the fixed chassis 10 is sleeved on the outer side of the rotary disk 9, the rotary support 14 is arranged inside the fixed chassis 10, and a sealing ring is clamped between the rotary disk 9 and the fixed chassis 10.
As a further scheme of this embodiment, the central decompression cone 7 is a conical shell, and the top of the central decompression cone 7 is provided with a through hole.
As a further development of this embodiment, the cone angle of the central decompression cone 7 is not more than 60 °.
As a further solution to this embodiment, the scraper 8 has at least two blades, and one end of the blade away from the rotation center is tangent to the inner side wall of the conical bin bottom 6.
Specifically, as shown in fig. 2, as for the scraper, the inward bending direction of the scraper is consistent with the rotating direction, i.e. the scraper rotates clockwise in the figure, and the outer end part of the scraper is tangent to the inner wall of the conical bin bottom.
As a further scheme of this embodiment, the upper part of the feed well 3 is a cylindrical barrel, the lower part of the feed well is a truncated cone-shaped barrel, and the upper end surface of the feed well 3 is flush with the upper end surface of the overflow chute 2.
As a further scheme of this embodiment, the system further comprises a sand discharging funnel 12, an upper end of the sand discharging funnel 12 is connected with the conical bin bottom 6, and the sand discharging funnel 12 is communicated with the discharge hole.
Specifically, the sand discharging funnel 12 is connected with the conical bin bottom 6 through a flange and a bolt, and a gate valve 15 connected through a flange is further arranged at an outlet at the lower end of the sand discharging funnel 12. The outlet of the sand discharging funnel 12 is communicated with a discharging pipeline.
As a further scheme of this embodiment, the cone angle of the sand-discharging funnel 12 is smaller than the repose angle of the tailings.
As a further scheme of this embodiment, the inlet pipe includes two at least branch material pipes, divide the material pipe respectively with the inlet pipe is linked together, divide the inlet pipe along the tangential direction of feedwell 3 with feedwell 3 intercommunication.
As a further scheme of this embodiment, the upper part of the circulation well 4 is a cylindrical barrel, the lower part of the circulation well 4 is a circular truncated cone, and the diameter of the bottom of the circulation well 4 is equal to the diameter of the top of the annular deflector cone 5.
As a further scheme of this embodiment, annular guiding cone 5 includes a positive cone section of thick bamboo and an inverted cone section of thick bamboo, positive cone section of thick bamboo cup joints outside the inverted cone section of thick bamboo, and the top fixed connection of each other, a positive cone section of thick bamboo has the outer conical surface, an inverted cone section of thick bamboo has interior conical surface, interior conical surface with the contained angle of outer conical surface is 60. Specifically, as shown in fig. 1, the forward conical cylinder is a circular truncated cone-shaped cylinder with a small upper end diameter and a large lower end diameter, and the reverse conical cylinder is a circular truncated cone-shaped cylinder with a large upper end diameter and a small lower end diameter.
As a further scheme of the embodiment, the sand silo further comprises supporting legs 13, and the supporting legs 13 are fixedly connected with the outer wall of the sand silo body 1.
The utility model discloses a realize its technical purpose through following principle:
a clarification zone A, a transition zone B (or called interference settling zone), a settling zone C and a compression zone D are naturally formed from top to bottom in the deep cone dense sand silo.
The clarification area A is a micro-particle suspension aggregation area which is not flocculated and settled and escapes, and the mass concentration of the micro-particle suspension aggregation area is basically equal to that of clear water; the transition zone B (or called interference settling zone) is a main zone for rapid settling of coarse-particle tailings and flocculation and agglomeration of fine particles; in the settling zone C, the fine particles basically complete flocculation and agglomeration and generate vertical settling together with coarse particle tailings; in the compression zone D, the naturally gravity settled coarse fraction tailings and the flocculated and agglomerated settled fine fraction tailings are mutually superposed to form a compression layer of solid particles, and in the zone, 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 theory of flocculation and sedimentation indicates that flocculation and agglomeration need to create the opportunity for mutual collision and combination for colloid particles, and in steady-state sedimentation, the flocculation of tailings is mainly based on the Brownian motion of particles; in continuous dynamic sedimentation, the pushing action of external force on particles is an important condition for accelerating the movement and the growth of agglomeration of the particles so as to realize sedimentation.
The utility model discloses a dense sand silo that special structural design constitutes makes low concentration tailing and the flocculating agent that gets into feed well 3 produce the flow field that does benefit to the flocculation agglomeration in this sand silo body 1, 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.
After the low-concentration tailings are fed into the feeding well 3 through the feeding pipe, the coarse fraction tailings are centrifugally settled along the side wall or naturally settled along the inner side wall of the feeding well 3 between the feeding well 3 and the circulating well 4 or along the inner side wall of the feeding well 3. The settled coarse fraction tailings fall to the outer surface of the lower cone of the circulation well 4, forming a stream of higher mass concentration and flow rate. The material flow is further divided by an annular diversion cone 5 positioned at the lower part of the circulating well 4 in the settling process to form material flows with higher mass concentration and flow velocity distributed on the inner conical surface and the outer conical surface of the annular diversion cone 5.
Correspondingly, in the outer surface of the cone at the lower part of the circulating well 4 and other transition areas B of the outer conical surface of the annular diversion cone 5, the mass concentration and the flow velocity of the tailings are low, so that the flow velocity difference is generated, and a vortex rotational flow field is further 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 C is low, solid particles are rapidly reduced, 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 feeding well 3 at the upper part of the sand silo body 1, the rising low-concentration micro-particles naturally form a turbid liquid aggregation area, flocculation and agglomeration of a flocculating agent and the micro-particles are facilitated, agglomerated flocculent tailings naturally settle and accumulate on the surface of a cone at the lower part of the feeding well 3 by the gravity of the agglomerated flocculent tailings, and naturally slide to the annular diversion cone 5 and continue to settle after the oblique angle of the cone is not enough to support the formed flocculent aggregates. 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 region D from the lower part of the annular diversion cone 5 to the lower part of the dense sand silo, the naturally gravity settled coarse-fraction tailings and the flocculated and agglomerated settled fine-fraction tailings are mutually superposed to form a compression layer of solid particles, and in the region, 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 this kind of special structural design of feed well 3 upper end parallel and level in overflow launder 2 upper end utilizes the concentration difference of feeding thick liquid and supernatant, and the liquid level difference of formation accomplishes the automation and dilutes. In a compression zone at the lower part of the dense sand silo, extruded and raised low-concentration turbid liquid and the low-concentration turbid liquid at the lower part and the middle part of the annular diversion cone 5 enter a bell mouth at the lower part of the circulating well 4 under the action of flow speed difference caused by concentration difference, rise to the upper end part of the circulating well 4, and overflow to the inside of the feeding well 3 by utilizing the special design that the upper end part of the circulating well 4 is lower than the height difference at the upper end part of the feeding well 3. Furthermore, by utilizing the special structural design that the upper end part of the feeding well 3 is flush with the upper end part of the overflow groove 2, the liquid level height difference generated by the specific gravity difference between the inside and the outside of the feeding well 3 is utilized to ensure that the supernatant overflows into the feeding well 3, the feeding material in the feeding well 3 is diluted, and the flocculating agent is easier to flocculate and agglomerate with the low-concentration tailings in the environment with proper concentration.
Through the automatic dilution system that above special structure design formed, the dilution water yield can be along with the fluctuation of feeding concentration and adjust by oneself, and the inside thick liquid concentration of feedwell 3 remains throughout in the best concentration settlement scope, and the dilution water yield depends on the size of feeding thick liquid volume and the height of concentration. The automatic dilution system enables the concentration of the slurry in the feeding well 3 to be dynamically stable, and the flocculating agent and the low-concentration tailings can more easily perform flocculation and agglomeration in a proper concentration environment. The automatic dilution system has the other characteristic that the consumption of the flocculating agent can be saved by 20-40%.
The utility model discloses a great deal of application fields such as tailing dry run and tailing fill can be applicable to. The method is particularly suitable for filling occasions with variable working conditions: when the device is filled, the device can be used as tailing thickening equipment, and can realize real-time regulation and control of sand discharge amount by carrying out frequency modulation and speed regulation control on the rotary driving device; when not filling, the utility model discloses can fill tailing storage device, be a high volume rate tailing storehouse.
The utility model discloses have extensive adaptability to the size fraction of tailing. The coarse fraction tailings can be naturally gravity settled to realize accumulation and dehydration; the fine-grained tailings can be accumulated and dehydrated through flocculation and agglomeration; compression accumulation dewatering from top to bottom can also be achieved.
The utility model has the characteristics of storage and throughput are big and the space occupies for a short time, and the design of big length-diameter ratio can effectual reduction occupation of land space, realizes great storage and throughput, and simultaneously, the high concentration that the tailing can be realized in longer subsides route holds and discharges.
The working process of the utility model is as follows:
after the low-concentration tailings and the flocculating agent are fed into the feeding well 3 through the feeding pipe, the flocculating agent is fully dispersed and mixed in the high-speed flow field environment of the feeding well 3. Meanwhile, the coarse fraction tailings are settled by centrifugal force along the side wall of the feed well 3 by virtue of centrifugal force generated by high-speed feed flow. The settled coarse fraction tailings fall to the outer surface of the lower cone of the circulation well 4, forming a stream of higher mass concentration and flow rate. The material flow is further divided by an annular diversion cone 5 positioned at the lower part of the circulating well 4 in the settling process to form material flows with higher mass concentration and flow velocity distributed on the inner conical surface and the outer conical surface of the annular diversion cone 5.
Correspondingly, in the outer part of the cone at the lower part of the circulating well 4, the bottom of the annular diversion cone 5, the middle part of the annular diversion cone 5 and the outer area of the feeding well 3, the mass concentration and the flow velocity of the tailings are low, so that the flow velocity difference is generated, and a vortex rotational flow field is further 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 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 a compression area from the lower part of the annular diversion cone 5 to the bottom of the dense sand silo, the naturally gravity settled coarse-fraction tailings and the flocculated and agglomerated settled fine-fraction tailings are mutually superposed to form a compression layer of solid particles, and in the compression 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 low-concentration suspension extruded and rising in the compression zone and the low-concentration suspension at the lower part and the middle part of the annular diversion cone 5 enter a bell mouth at the lower part of the circulating well 4 under the action of flow speed difference caused by concentration difference, rise to the upper end part of the circulating well 4 and overflow to the feed well 3. The feeding of the low-concentration turbid liquid further dilutes the fed materials in the feed well 3, so that the sedimentation of the tailings is closer to natural sedimentation, and the sedimentation speed is increased.
The upper end of the feeding well 3 is flush with the upper end of the overflow weir 2, and the liquid level difference generated by the specific gravity difference of the materials inside and outside the feeding well 3 is utilized to overflow the supernatant into the feeding well 3, so that the feeding materials in the feeding well 3 are diluted, and the flocculating agent is easier to flocculate and agglomerate with the low-concentration tailings in a proper concentration environment.
The concentration of the flocculated tailings is gradually increased from top to bottom in the sedimentation process under the action of gravity, and the central pressure reducing cone 7 which is arranged at the bottom of the dense sand bin and fixed on the inner wall of the dense sand bin has two functions, so that the problem of high tailing compaction density at the bottom of the dense sand bin can be solved through the central pressure reducing cone 7, the stress condition of the bin bottom is optimized, and the power consumption of a sand discharging device is reduced; one is to make the drained water flow back to the upper part through the low-pressure area inside the cone of the central decompression cone 7.
As shown in figure 1, the gate valve 15 is installed at the lower end of the central sand discharging hopper 12, the gate valve 15 can be opened and closed by a hydraulic cylinder or an electric push rod, and remote control opening and closing can be realized according to requirements. It should be noted that, the control process belongs to the prior art, not the utility model discloses the scheme that needs protection, no longer describe herein.
After the tailings in the dense sand bin are flocculated and concentrated to a preset concentration, the driving device 11 is started to drive the pair of crab claw-shaped scrapers 8 to make rotary motion at the bottom of the bin, so that the high-concentration deposited tailings with higher compaction density can be scraped to the central sand discharge hopper 12 to be discharged out of the sand bin.
Dense sand silo and scraper fluidization sand discharging device adopts puts sand device, can be at the bottom of the storehouse rotary motion through drive arrangement drive scraper under the prerequisite that does not reduce tailings concentration and do not influence dense effect, make the loose and continuous discharge to central motion of compacted tailing, reach the unobstructed effect of sand discharging.
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 dense sand silo with a scraper fluidizing device is characterized by comprising a sand silo body (1) with a cavity, a feeding pipe, an overflow chute (2), a feeding well (3), a circulating well (4), an annular flow guide cone (5), a central pressure reduction cone (7) and the scraper fluidizing device;
the bottom of the sand silo body (1) is fixedly connected with a conical silo bottom (6), the side wall of the conical silo bottom (6) is conical, the bottom wall is a plane, and a discharge hole is formed in the center of the bottom wall;
the overflow groove (2) is fixedly connected with the top of the inner wall of the sand silo body (1);
the feeding well (3) is sleeved at the center of the top of the cavity of the sand cabin body (1) and is fixedly connected with the sand cabin body (1);
the circulating well (4) is sleeved in the feeding well (3) and is fixedly connected with the top of the feeding well (3), and a feeding area is formed between the feeding well (3) and the circulating well (4);
said feed tube communicating with said feed zone;
the annular diversion cone (5) is arranged right below the circulating well (4) and is fixedly connected with the inner wall of the sand cabin body (1), and the diameter of the top of the annular diversion cone (5) is the same as that of the circulating well (4);
the central decompression cone (7) is arranged above the discharge hole and is connected with the inner wall of the conical bin bottom (6);
scraper fluidizer includes scraper (8), slewing bearing (14) and drive arrangement (11), scraper (8) with slewing bearing (14) fixed connection, slewing bearing (14) with drive arrangement (11) are connected through drive mechanism, the bottom surface of scraper (8) with the diapire inboard contacts, scraper (8) are in drive arrangement's (11) drive down with the center department of discharge gate is the center of rotation and rotates on the diapire.
2. The sand silo with scraper fluidization device according to claim 1, characterized in that the central decompression cone (7) is a conical shell with an open bottom end, and the top of the central decompression cone (7) has a through hole.
3. A dense sand silo with a scraper fluidization device according to claim 2, characterized in that the cone angle of the central decompression cone (7) is not more than 60 °.
4. A dense sand silo with a scraper fluidization device according to claim 1, characterized in that the scraper (8) has at least two blades, the end of which remote from the center of rotation is tangent to the inner side wall of the conical silo bottom (6).
5. The sand silo with scraper fluidization device according to claim 1, characterized in that the upper part of the feed well (3) is a cylindrical barrel and the lower part is a truncated cone shaped barrel, and the upper end surface of the feed well (3) is flush with the upper end surface of the overflow launder (2).
6. The sand silo with scraper fluidization device according to claim 1, characterized in that it further comprises a sand hopper (12), the upper end of said sand hopper (12) is connected to said conical silo bottom (6), and said sand hopper (12) is connected to said discharge hole.
7. A dense sand silo with scraper fluidization device according to claim 6, characterized in that the cone angle of the sand hopper (12) is smaller than the repose angle of the tailings.
8. Dense sand silo with scraper fluidization device according to claim 1, characterized in that the feed pipe comprises at least two branch feed pipes, which are respectively connected to the feed pipe, and which are connected to the feed well (3) tangentially to the feed well (3).
9. Dense sand silo with scraper fluidization device according to claim 1, characterized in that the upper part of the circulation well (4) is a cylindrical barrel and the lower part is a round-truncated-cone-shaped barrel, and the diameter of the bottom of the circulation well (4) is equal to the diameter of the top of the annular diversion cone (5).
10. The sand silo with scraper fluidization device according to any one of claims 1 to 9, wherein the annular diversion cone (5) comprises a forward cone cylinder and an inverted cone cylinder, the forward cone cylinder is sleeved outside the inverted cone cylinder, the tops of the forward cone cylinder and the inverted cone cylinder are fixedly connected with each other, the forward cone cylinder has an outer conical surface, the inverted cone cylinder has an inner conical surface, and the included angle between the inner conical surface and the outer conical surface is 60 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920751073.2U CN210302533U (en) | 2019-05-23 | 2019-05-23 | Dense sand silo with scraper fluidizing device |
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| CN201920751073.2U CN210302533U (en) | 2019-05-23 | 2019-05-23 | Dense sand silo with scraper fluidizing device |
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| CN210302533U true CN210302533U (en) | 2020-04-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113069798A (en) * | 2021-05-18 | 2021-07-06 | 中钢集团马鞍山矿山研究总院股份有限公司 | Vertical flow sedimentation tank with functions of inhibiting feeding disturbance and adjusting sedimentation time |
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2019
- 2019-05-23 CN CN201920751073.2U patent/CN210302533U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113069798A (en) * | 2021-05-18 | 2021-07-06 | 中钢集团马鞍山矿山研究总院股份有限公司 | Vertical flow sedimentation tank with functions of inhibiting feeding disturbance and adjusting sedimentation time |
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