CN111495733A

CN111495733A - Wet screening device and system

Info

Publication number: CN111495733A
Application number: CN202010237884.8A
Authority: CN
Inventors: 高惠民; 马骏辉; 任子杰; 周贤武; 何祥亮
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-08-07

Abstract

The invention discloses a wet screening device which comprises a cylinder body, wherein an upper end cover is arranged at the top of the cylinder body, and a lower end cover is arranged at the bottom of the cylinder body; a cylindrical screen mesh which is longitudinally arranged is sleeved in the cylinder body, the top end and the bottom end of the cylindrical screen mesh are detachably connected with the upper end cover and the lower end cover respectively, and the screen mesh divides the cylinder body into an inner cavity and an outer cavity; the slurry outlet of the slurry inlet pipe is communicated with the inner cavity, and the pulsating slurry inlet device periodically pushes the slurry in the slurry inlet pipe into the inner cavity; the lower cover plate is also provided with a coarse grain discharge pipeline and a clear water pipeline which are communicated with the inner cavity, and the coarse grain discharge pipeline is positioned on the outer side of the clear water pipeline and is close to the cylindrical screen; and a fine particle discharging pipeline is further installed on the cylinder body close to the lower end cover. The problem that the screen is blocked by 'false big pieces' due to the fact that graphite is easy to settle and is easy to overlap when the transverse screen is screened is effectively solved, sorting indexes are improved, and energy consumption and cost are reduced.

Description

Wet screening device and system

Technical Field

The invention belongs to the field of graphite ore purification, and particularly relates to a wet screening device and a system.

Background

Graphite is lamellar non-metallic ore, in the screening operation of utilizing traditional screening machine, the screen cloth is at the bottom side, the screening in-process, because the big piece mineral of reason of gravity easily piles up and covers the sieve mesh, the flake mineral is at the in-process of whereabouts, because of the reason of its settlement resistance, subsides with horizontal rather than vertically mode, when arriving on the screen cloth of bottom side, the piece is lapped mutually and is formed "false big piece", and because graphite hydrophobicity is good, hydrophobic flocculation makes the overlap joint comparatively inseparable, even the screen cloth increases the vibration, the lamella mineral also can not drop easily like granular mineral, the vibration can make "false big piece" overlap joint inseparabler on the contrary, the phenomenon of sieve mesh jam can not be alleviated, lead to the small-size mineral to see through the sieve mesh difficulty, screening efficiency is very low, the screening. It is therefore desirable to design a device that can effectively clean the screen to achieve efficient screening.

In order to solve the problem of the screening efficiency of graphite flake laminar non-metallic ore, the Chinese patent publication No.: CN207446662U discloses a technology of a screening net for producing mica iron oxide. This technique adopts the double-deck screening net, utilizes pulse solenoid valve's jetting effect to wash the screen cloth simultaneously, has effectively improved screening quality, has reduced the adverse effect because of the screen cloth blocks up and causes. However, the screening size range of the equipment is narrow, the packing efficiency of the screened materials is low, and the equipment is only limited to dry screening and cannot be adopted in a wet processing process.

Disclosure of Invention

The invention aims to overcome the technical defects and provides a wet screening device and a wet screening system to solve the problem that graphite is easy to settle and is easy to overlap to form 'false big pieces' to block a screen when a transverse screening screen is screened in the prior art, so that the screening effect is influenced.

In order to achieve the technical purpose, the wet screening device comprises a cylinder body, wherein an upper end cover is arranged at the top of the cylinder body, and a lower end cover is arranged at the bottom of the cylinder body;

a cylindrical screen mesh which is longitudinally arranged is sleeved in the cylinder body, the top end and the bottom end of the cylindrical screen mesh are detachably connected with the upper end cover and the lower end cover respectively, the cylinder body is divided into an inner cavity and an outer cavity by the screen mesh, wherein the inner cavity is positioned in the screen mesh, and the outer cavity is positioned outside the screen mesh;

the lower cover plate is provided with a pulp inlet pipe, the pulp inlet pipe is connected with a pulsating pulp inlet device, a pulp outlet of the pulp inlet pipe is communicated with the inner cavity, and the pulsating pulp inlet device periodically pushes pulp in the pulp inlet pipe into the inner cavity;

the lower cover plate is also provided with a coarse grain discharge pipeline and a clear water pipeline which are communicated with the inner cavity, and the coarse grain discharge pipeline is positioned on the outer side of the clear water pipeline and is close to the cylindrical screen;

a fine particle discharge pipeline is further mounted on the cylinder body at a position close to the lower end cover and communicated with the outer cavity;

and the upper end cover is provided with a vibrator.

Further, the screen cloth sets up to the multilayer, the multilayer the screen cloth is with axle center and interval setting, the multilayer the top and the low side of screen cloth equally divide respectively with upper end cover and the detachable connection of lower end cover, it is a plurality of the aperture of screen cloth has inside to outside to reduce gradually.

Furthermore, a plurality of concentric annular grooves are formed in the upper end cover and the lower end cover, and the plurality of screens are fixed in the grooves through bolts respectively.

Further, the pulsation slurry inlet device comprises a base, a rotating shaft, a rotating disc, a connecting rod and a piston, wherein the rotating shaft is connected with the base in a rotating mode, the rotating disc is fixedly connected with one end of the rotating shaft, the connecting rod is sleeved with the sliding block, the supporting rod and the piston, the sliding block is arranged in the slurry inlet pipe, the bottom of the sliding block is connected with one end of the connecting rod in a hinged mode, the other end of the connecting rod is connected with the rotating disc in a hinged mode, the position of the rotating disc, deviating to the axis center, of the rotating disc is connected with the bottom of the supporting rod, the top end.

Further, the piston is made of rubber or the top of the piston is covered with a rubber cushion.

Furthermore, the clear water pipeline, the coarse grain discharge pipeline and the fine grain discharge pipeline are all provided with a plurality of, and a plurality of clear water pipeline, coarse grain discharge pipeline and fine grain discharge pipeline evenly arrange along the circumferencial direction, and each install the valve on clear water pipeline, coarse grain discharge pipeline and the fine grain discharge pipeline.

Further, the cylinder is made of metal or polyurethane and the like.

The invention provides a wet screening system, which comprises a plurality of screening devices, wherein slurry inlet pipes of the screening devices are communicated with a slurry inlet main pipe through a pipeline, and each pipeline is provided with a control valve.

Compared with the prior art, the invention has the beneficial effects that:

1. this graphite wet screening plant adopts vertical screen cloth, and the fine material transversely passes the sieve mesh and realizes the screening under the drive of horizontal rivers, and the screening of traditional gravity settlement in-process prevents the overlap joint of flaky mineral granule each other, prevents that the screen cloth from being covered the sieve mesh by jumbo size slice or lapped "artificial big piece" mineral, has reduced the jam of sieve mesh, has improved the quality and the rate of recovery of scale graphite.

2. The screen cloth passes through the upper end cover and links to each other with the vibrator, has increased the screening space, and the vibrator can carry out effectual cleaing away to the mineral that adheres to at the screen cloth, prevents to block up the sieve mesh, improves screening efficiency, with the screen cloth with upper end cover and lower end cover set up to detachable connection can make things convenient for the washing of screen cloth.

3. The pulsating slurry feeding is realized through the eccentric connecting rod, so that the mineral particles are dispersed more uniformly, the screening time is shortened, the flaky mineral particles are prevented from being mutually overlapped, the screen meshes are prevented from being covered by large-size flaky or overlapped 'pseudolarge-piece' minerals, the blockage of the screen meshes is reduced, and the quality of the flake graphite is improved.

4. The step of washing with clean water is added, the washing time is adjustable, the content of fine particles in the coarse-grain discharged materials can be effectively reduced, and the screening efficiency is improved.

5. The screening device is not limited to a single screening device, and can be used by a plurality of screening devices in a staggered mode, so that the screening feeding and discharging are integrally continuous.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of a wet screening apparatus provided in the present invention;

FIG. 2 is a schematic structural view of the bottom of the bowl of FIG. 1;

FIG. 3 is a schematic structural view of one embodiment of a wet screening apparatus including a multi-layer screen according to the present invention;

FIG. 4 is a schematic structural diagram of an embodiment of a pulsating slurry feed device;

FIG. 5 is another schematic structural diagram of the pulsating slurry feeding device;

FIG. 6 is a schematic diagram of the configuration of one embodiment of a wet screening system provided by the present invention;

description of reference numerals:

1-upper end cover, 2-screen mesh, 3-barrel, 4-ore pulp pipeline, 5-pulsation slurry feeding device, 6-clear water pipeline, 7-coarse grain discharge pipeline, 8-lower end cover, 9-fine grain discharge pipeline, 10-vibrator, 11-support rod, 12-rubber cushion, 13-inner cavity, 14-outer cavity, 15-slurry feeding main pipe, 16-pipeline, 51-slide block, 52-connecting rod, 53-base, 54-rotating shaft, 55-disc, 21-first screen mesh, 22-second screen mesh and 23-third screen mesh.

Detailed Description

The present screening technique has been clearly and completely understood by looking at the drawings in the examples, which are intended as a part of this embodiment and not as a whole.

Example 1

As shown in fig. 1 and 2, the wet sieving device comprises a cylinder 3, wherein an upper end cover 1 is arranged at the top of the cylinder 3, and a lower end cover 8 is arranged at the bottom of the cylinder 3.

The barrel 3 is internally sleeved with a cylindrical screen 2 which is longitudinally arranged, the top end and the bottom end of the cylindrical screen 2 are detachably connected with the upper end cover 1 and the lower end cover 8 respectively, the barrel 3 is divided into an inner cavity and an outer cavity by the screen 2, wherein the inner cavity 13 is positioned in the screen, and the outer cavity 14 is positioned outside the screen. The detachable connection can be in bolt connection or clamping connection and the like, and is mainly used for conveniently detaching and cleaning the screen.

As shown in fig. 4 and 5, the lower cover plate 8 is further provided with a coarse grain discharge pipeline 7 and a clean water pipeline 6 which are communicated with the inner cavity 13, the cylinder 3 is further provided with a fine grain discharge pipeline 9 at a position close to the lower end cover 8, and the fine grain discharge pipeline 9 is communicated with the outer cavity. The coarse particle discharge pipe 7 is used for discharging the crystalline flake graphite blocked in the inner cavity from the cylinder 3, and the fine particle discharge pipe 9 is used for discharging the fine particle graphite passing through the screen 2 from the outer cavity 14. The lower end cover is communicated with a plurality of clear water pipelines 6 for washing minerals.

Since part of the scale graphite adheres to the screen 2 during screening and falls from the screen 2 to the bottom at the vibrator 10, the coarse grain discharge pipe 7 is located outside the clean water pipe 6 and near the cylindrical screen 2 in order to more conveniently and reliably discharge the scale graphite from the inside of the inner cavity.

As shown in fig. 5 and 6, a slurry inlet pipe 4 is further installed on the lower cover plate 8, the slurry inlet pipe 4 is connected with a pulsating slurry inlet device 5, a slurry outlet of the slurry inlet pipe 4 is communicated with an inner cavity 13, and the pulsating slurry inlet device 5 periodically pushes the slurry in the slurry inlet pipe 4 into the inner cavity 13. The ore pulp is periodically pushed into the inner cavity 13, so that the ore particles can be dispersed more uniformly, and meanwhile, the transverse resultant force is generated under the action of the water flow force, and fine-particle graphite can pass through the sieve pores.

More specifically, the pulsating slurry feeding device 5 comprises a base 53, a rotating shaft 54 rotatably connected with the base 53, a rotating disc 55 fixedly connected with one end of the rotating shaft 54, a connecting rod 53, and a sliding block 51, a supporting rod 11 and a piston 12 sleeved in the slurry feeding pipe 4, wherein the bottom of the sliding block 51 is hinged to one end of the connecting rod 52, the other end of the connecting rod 52 is hinged to the position of the rotating disc 55 deviating from the axis center, the bottom of the supporting rod 11 is connected with the sliding block 51, the top end of the supporting rod 11 is connected with the piston 12, and the other end of the rotating shaft 54 is connected with an output shaft of a driving motor (not shown in the figure).

The working principle of the pulsating pulp feeding device is that the driving motor drives the rotating shaft 54 to rotate, so as to drive the rotating disc 55 to rotate, and the rotating disc 55 rotates to drive the piston 12 to reciprocate in the pulp feeding pipe 4, so that the pulp is periodically pushed into the inner cavity.

In order to reduce the wear of the piston 12 by the slurry, the piston 12 is preferably made of rubber or the top of the piston is covered with a rubber cushion.

For convenient control, valves are arranged on the slurry inlet pipeline 4, the coarse grain discharge pipeline 7, the fine grain discharge pipeline 9 and the clean water pipeline 6.

The vibrator 10 is arranged on the upper end cover 1, and the vibrator 10 drives the cylinder 3 to vibrate to shake off the residual graphite ores attached to the screen 2 and the wall of the cylinder.

Preferably, the cylinder 1 is fixed in a groove between the upper end cover 1 and the lower end cover 8 through bolts, fine-grained materials transversely pass through the sieve holes under the action of transverse water flow and enter the outer cavity 14 to realize sieving, and the crystalline flake graphite is blocked at the other side of the sieve, namely the inner cavity 13.

Preferably, the screen 2 between the upper and

lower end caps

1,8 is not necessarily fixed as a single layer, but may also be a multi-layer screen (e.g. a first screen 21, a second screen 22, a third screen 23, etc.), the multi-layer screen is coaxially and alternately arranged, the size of the layer of screen gradually decreases from inside to outside, so as to realize the screening of graphite with different particle sizes, and the screen holes are preferably round holes.

The working principle of the wet screening device is as follows:

(1) material screening initial stage: opening a slurry inlet valve, closing a clear water valve and a coarse grain material discharge valve, sieving the materials under the action of pulsation and water flow, discharging fine grain products from a fine grain mineral discharge pipeline through a screen 2, and blocking coarse grain crystalline flake graphite in the screen 2;

(2) cleaning coarse grain materials: closing the slurry inlet valve, keeping the coarse-grained material discharge valve closed, opening the clean water valve, cleaning the inner cavity, the coarse-grained minerals and the fine-grained minerals adhered to the screen mesh by the mineral particles under the action of pulse force and water flow, and discharging the mineral particles through the fine-grained discharge pipeline after penetrating through the screen mesh;

(3) and (3) a coarse grain product treatment stage: the slurry inlet valve and the fine particle discharge valve are closed, the coarse particle discharge valve, the clean water valve and the vibrator 10 are opened, and during the vibration of the screen 2, the coarse particles attached to the screen 2 fall to the screen bottom, and are discharged through the coarse particle discharge pipe 7.

The running time proportion of the three stages is adjusted according to the composition of coarse and fine particles entering the slurry, the requirement of screened products and the size of the device.

This graphite wet screening plant adopts vertical screen cloth, under the drive of pulsation and horizontal rivers, produces horizontal impetus to the ore pulp, makes the granule slice material transversely pass the sieve mesh and realizes screening, and screening in-process screening is subsided to traditional gravity prevents the overlap joint of slice mineral granule each other, prevents that the screen cloth from being covered the sieve mesh by jumbo size slice or lapped "artificial big piece" mineral, has reduced the jam of sieve mesh, has improved the quality of scale graphite.

Example 2

As shown in fig. 6, the present invention further provides a wet screening system, where the screening system includes a plurality of screening devices according to embodiment 1, slurry inlet pipes 4 of the plurality of screening devices are all communicated with a slurry inlet header pipe 15 through a pipe 16, and each pipe is equipped with a control valve for respective control, so that the number of devices to be screened can be selected according to needs, the throughput is increased, and the adaptability is improved.

The screening device is not limited to a single screening device, and can be used by a plurality of screening devices in a staggered mode, so that the screening feeding and discharging are integrally continuous.

In the description of the present patent application, the orientations and mounting relationships indicated by the respective components are the orientations and mounting relationships shown in the drawings, which are only for convenience in describing and roughly understanding the present patent, and do not imply that the devices or elements referred to must have a specific orientation and a specific configuration, and thus, are not to be considered as limiting the present invention. Those skilled in the art, after reading this specification, may make modifications to the embodiments as required, without any inventive contribution thereto, but fall within the scope of the claims of the present invention.

Claims

1. The wet screening device is characterized by comprising a cylinder body, wherein the top of the cylinder body is provided with an upper end cover, and the bottom of the cylinder body is provided with a lower end cover;

and the upper end cover is provided with a vibrator.

2. A screening device according to claim 1, wherein said screens are arranged in a plurality of layers, said plurality of layers being concentric and spaced apart, said plurality of layers being removably connected at top and bottom ends to said upper and lower end caps, respectively, and said plurality of screens having progressively decreasing apertures inwardly and outwardly.

3. A screening apparatus according to claim 2, wherein said upper and lower end caps are provided with a plurality of concentric annular channels, and a plurality of said screens are secured within said channels by respective bolts.

4. A screening device as claimed in claim 1, wherein the pulsating slurry inlet device comprises a base, a rotating shaft rotatably connected with the base, a rotating disc fixedly connected with one end of the rotating shaft, a connecting rod, a sliding block, a supporting rod and a piston, wherein the sliding block, the supporting rod and the piston are sleeved in the slurry inlet pipe, the bottom of the sliding block is hinged with one end of the connecting rod, the other end of the connecting rod is hinged with the rotating disc at a position deviating from the axis center, the bottom of the supporting rod is connected with the sliding block, the top end of the supporting rod is connected with the piston, and the other end of the rotating shaft is connected with an output shaft of a driving motor.

5. A screening device according to claim 4, wherein the piston is made of rubber or the top of the piston is covered with a rubber cushion.

6. A screening apparatus according to claim 1, wherein a plurality of said clean water, coarse discharge and fine discharge pipes are provided, said plurality of clean water, coarse discharge and fine discharge pipes being arranged uniformly in a circumferential direction, and each of said clean water, coarse discharge and fine discharge pipes having a valve mounted thereon.

7. A screening apparatus according to claim 1, wherein the cartridge is made of metal or polyurethane.

8. A wet screening system, characterized in that the screening system comprises a plurality of screening devices as claimed in any one of claims 1 to 7, the slurry inlet pipes of the screening devices are communicated with a slurry inlet main pipe through a pipeline, and each pipeline is provided with a control valve.