CN110075612B

CN110075612B - Powder slag secondary extraction device

Info

Publication number: CN110075612B
Application number: CN201910467722.0A
Authority: CN
Inventors: 王六四; 郑孟; 刘胜
Original assignee: Anhui Zhongju Mechanical And Electrical Equipment Co ltd
Current assignee: Anhui Zhongju Mechanical And Electrical Equipment Co ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2021-04-06
Anticipated expiration: 2039-05-31
Also published as: CN110075612A

Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a powder slag secondary extraction device which comprises a liquid storage tank, a filter roller, a suction device and a slag discharging device, wherein the filter roller is rotatably arranged in the liquid storage tank, the axis of the filter roller is horizontally arranged, a filter membrane is arranged on the wall of the filter roller, a negative pressure cavity is arranged on the inner side of the wall of the filter roller, the negative pressure cavity is communicated with the suction device, at least part of the roller surface of the filter roller is submerged below the liquid level of the liquid storage tank, and the other part of the roller surface is exposed above the liquid level of the liquid storage tank; the slag discharging device is arranged corresponding to the roller surface of the filtering roller above the liquid level of the liquid storage tank and is used for removing mud cakes adsorbed on the roller surface and discharging the mud cakes from the upper part of the liquid storage tank. The invention firstly utilizes the aeration flushing process to separate the powder slag from the large-particle slag, and then utilizes the vacuum filtration to prevent the powder slag from being separated from the waste water, thereby realizing the dual recycling of the steel slag and the powder slag.

Description

Powder slag secondary extraction device

Technical Field

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a secondary extraction device for powder slag.

Background

The steel slag is a by-product in the steel-making process, and is formed from various oxides formed by oxidizing impurities of silicon, manganese, phosphorus and sulfur in pig iron in the smelting process and salts produced by reaction of these oxides with solvent. The steel slag as a secondary resource is comprehensively utilized by two main ways, one way is that the steel slag is used as a smelting solvent to be recycled in the factory, so that the steel slag not only can replace limestone, but also can recover a large amount of metallic iron and other useful elements; the other is used as a raw material for manufacturing road building materials, building materials or agricultural fertilizers. The treatment of the steel slag mainly comprises the technical processes of water quenching, granulation, cooling, cleaning, grinding and the like, however, the process of the steel slag treatment process in the prior art is dispersive, the occupied space of equipment is large, the production efficiency is low, and the steel slag treatment process is difficult to adapt to the fast-paced metallurgical production requirement. In addition, the waste water after cleaning steel slag still contains available steel slag powder, but the steel slag treatment equipment in the prior art cannot fully utilize the steel slag powder.

Disclosure of Invention

The invention aims to provide a powder slag secondary extraction device capable of recovering steel slag powder in slag washing water.

In order to achieve the purpose, the invention provides the following technical scheme: a powder slag secondary extraction device comprises a liquid storage tank, a filter roller, a suction device and a slag discharging device, wherein the filter roller is rotatably arranged in the liquid storage tank, the axis of the filter roller is horizontally arranged, a filter membrane is arranged on the wall of the filter roller, a negative pressure cavity is arranged on the inner side of the wall of the filter roller, the negative pressure cavity is communicated with the suction device, at least part of the roller surface of the filter roller is submerged below the liquid level of the liquid storage tank, and the other part of the roller surface is exposed above the liquid level of the liquid storage tank; the slag discharging device is arranged corresponding to the roller surface of the filtering roller above the liquid level of the liquid storage tank and is used for removing mud cakes adsorbed on the roller surface and discharging the mud cakes from the upper part of the liquid storage tank.

The invention has the technical effects that: the invention firstly utilizes the aeration flushing process to separate the powder slag from the large-particle slag, and then utilizes the vacuum filtration to prevent the powder slag from being separated from the waste water, thereby realizing the dual recycling of the steel slag and the powder slag.

Drawings

FIG. 1 is a perspective view of a steel slag recycling system according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a slag pot provided by an embodiment of the present invention;

FIG. 3 is a perspective view of an assembled centrifugal disk according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of an assembled centrifugal disk structure provided in accordance with an embodiment of the present invention;

FIG. 5 is a perspective view of an on-line water jacket cleaning device provided by an embodiment of the present invention;

FIG. 6 is a perspective view of another perspective of the water jacket on-line cleaning device provided by the embodiment of the invention;

FIG. 7 is a top view of an on-line water jacket cleaning apparatus provided by an embodiment of the present invention;

FIG. 8 is a cross-sectional view of an on-line water jacket cleaning apparatus provided by an embodiment of the present invention;

FIG. 9 is a perspective view of a slag-water separation mechanism provided by an embodiment of the present invention;

FIG. 10 is a perspective view of a filter bowl provided by an embodiment of the present invention;

FIG. 11 is a front view of a filter bowl provided by an embodiment of the present invention;

FIG. 12 is a sectional view A-A of FIG. 11;

FIG. 13 is a cross-sectional view B-B of FIG. 11;

FIG. 14 is a side view of a filter bowl provided by an embodiment of the present invention;

fig. 15 is a cross-sectional view C-C of fig. 14.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.

As shown in fig. 1 and 2, a steel slag recovery processing system comprises a centrifugal granulation device and a vacuum filtration device, wherein the centrifugal granulation device comprises a slag tank 10, a centrifugal disc 20 is arranged in the center of the slag tank 10, the centrifugal disc 20 is rotatably arranged along the axis of the centrifugal disc 20, a first driving motor 11 for driving the centrifugal disc 20 to rotate is arranged in the slag tank 10, a molten steel slag pouring opening is arranged above the centrifugal disc 20, a cooling water jacket 30 is arranged on the inner wall of the slag tank 10, a spraying device 14 is arranged at the top of the slag tank 10, a slag-water separation mechanism is arranged at the bottom of the slag tank 10, a water outlet of the slag-water separation mechanism is communicated with the vacuum filtration device, and the vacuum filtration device is used for filtering and recovering powder slag in wastewater; the slag hole of the slag-water separation device is provided with a slag dragging mechanism, and the discharge end of the slag dragging mechanism is provided with a steel slag collecting device. The centrifugal granulating process is adopted to solidify the molten steel slag into steel slag particles, the spraying device 14 is used for water quenching in the sputtering process of the molten steel slag, so that the steel slag is further cracked into fine particles to be recycled, the slag-water separation device is directly arranged below the slag tank 10, the steel slag is directly cleaned and separated, the accumulation of the steel slag is avoided, and the recovery efficiency of the steel slag is improved.

Further, as shown in fig. 3 and 4, the centrifugal disc 20 is assembled to be capable of making a conical oscillating motion along a vertical axis, and a driving mechanism for driving the centrifugal disc 20 to make the conical oscillating motion is arranged in the slag tank 10. Specifically, a movable shaft sleeve 23 is arranged on a rotating shaft of the centrifugal disc 20, the movable shaft sleeve 23 is rotatably connected with the rotating shaft of the centrifugal disc 20, the movable shaft sleeve 23 is hinged with a movable ring 24 along the radial direction of the movable ring 24, the movable ring 24 is hinged with a frame inside the slag pot 10 along the radial direction, and the hinged shaft is perpendicular to the hinged shaft between the movable shaft sleeve 23 and the movable ring 24; the lower end of the rotating shaft of the centrifugal disc 20 is synchronously and rotatably connected with the main shaft of the first driving motor 11 through a transmission mechanism. The transmission mechanism comprises an intermediate shaft 21 and a transition shaft 22, the upper end of the intermediate shaft 21 is in synchronous rotating structure with the lower end of a rotating shaft of the centrifugal disc 20 through a universal joint, the lower end of the intermediate shaft 21 is in synchronous rotating connection with the upper end of the transition shaft 22 through the universal joint, and the lower end of the transition shaft 22 is in synchronous rotating connection with a main shaft of the first driving motor 11 through the universal joint; the middle shaft 21 is eccentrically arranged on a rotating disc 25, the axis of the rotating disc 25 is vertically arranged, the axis of the rotating disc 25, the axis of the centrifugal disc 20 which does conical pendulum motion and the axis of the main shaft of the first driving motor 11 are collinear, the middle shaft 21 is rotatably connected with the rotating disc 25, and the axis of the middle shaft 21 is parallel to the axis of the rotating disc 25. The driving mechanism for driving the centrifugal disc 20 to do conical pendulum motion comprises a first transmission shaft 26, the first transmission shaft 26 is rotatably arranged on the frame inside the slag pot 10 along the vertical direction, a main shaft of the first driving motor 11 forms transmission fit with the lower end of the first transmission shaft 26 through a first gear pair 27, the upper end of the first transmission shaft 26 forms transmission fit with the rotary disc 25 through a second gear pair 28, and the first gear pair 27 and the second gear pair 28 are both reduction gear pairs. An important drawback of the centrifugal granulator in the prior art is that the splashing path of the molten steel slag is always kept unchanged, so that the cooling water jacket 30 is always impacted by the steel slag in the same area, which may cause local overheating of the cooling water jacket 30 and affect the cooling effect, and may also cause rapid erosion of the steel plate in the area and affect the service life of the whole slag ladle 10. The centrifugal disc 20 is skillfully arranged into a cone-shaped structure, so that the splashing path of the molten steel slag is periodically fluctuated, all areas of the cooling water jacket 30 can be uniformly impacted by the steel slag, the cooling effect is more uniform, and the service life of the whole slag pot 10 is prolonged.

Preferably, the centrifugal disc 20 includes a top plate 201 and a bottom plate 202 arranged at intervals, the bottom plate 202 is a solid disc, the top plate 201 is a circular ring-shaped plate with a through hole at the center, the top plate 201 and the bottom plate 202 are connected by a plurality of blades 203, the plurality of blades 203 are arranged at intervals along the circumferential direction of the top plate 201 and the bottom plate 202, and each blade 203 is arranged in a vortex shape. The transmission mechanism and the driving mechanism are externally provided with a protective cover 29, the movable shaft sleeve 23 is arranged at the top of the protective cover 29, and the centrifugal disc 20 is convexly extended to the upper end of the protective cover 29. Preheating devices are further arranged on the upper side and the lower side of the centrifugal disc 20. The preheating device comprises an electric heating plate 204 arranged at the top end of the protective cover 29 and at the bottom end of the molten steel slag inclined opening. The preheating device is used for preheating the centrifugal disc 20 before granulation, so that the blades 203 of the centrifugal disc 20 are prevented from being blocked due to the fact that molten steel slag is rapidly solidified after meeting the centrifugal disc 20 at a low temperature. The included angle between the axial line of the centrifugal disc 20 and the vertical direction is 3-5 degrees, preferably 5 degrees.

Further, as shown in fig. 3 and 5-8, the water jacket on-line cleaning device further comprises a first cleaning head 31 rotatably disposed along the inner wall of the upper half portion of the cooling water jacket 30, and a second cleaning head 32 rotatably disposed along the inner wall of the lower half portion of the cooling water jacket 30, the first cleaning head 31 and the second cleaning head 32 are disposed apart from each other along the diameter direction of the cooling water jacket 30, the rotating direction and the rotating speed of the first cleaning head 31 and the second cleaning head 32 are the same, and the rotating angular speed of the first cleaning head 31 and the rotating angular speed of the second cleaning head 32 are the same as the angular speed and the direction of the centrifugal disc 20 during the conical swing motion, wherein the first cleaning head 31 is always disposed corresponding to the lower side of the centrifugal disc 20, and the second cleaning head 32 is always disposed corresponding to the higher side of the centrifugal disc 20; guide wheels 303 are further arranged on the first cleaning head 31 and the second cleaning head 32, and the guide wheels 303 are in rolling fit with the inner annular surface of the cooling water jacket 30. The online cleaning device can clean the cooling water jacket 30 in real time in the granulation process, and remove the steel slag assisted on the inner wall of the cooling water jacket 30 quickly, so that the cooling effect is further improved. According to the invention, the first cleaning head 31 and the second cleaning head 32 are respectively and correspondingly arranged at the wave trough and the wave crest of the steel slag splashing path, and the rotation speed of the cleaning heads is consistent with the cone swing speed of the centrifugal disc 20, so that the first cleaning head 31 and the second cleaning head 32 can always avoid the steel slag splashing path.

As shown in fig. 7, the first cleaning head 31 and the second cleaning head 32 include a blade 301 and a steel brush 302, the blade 301 is located at the front side of the movement direction of the steel brush 302, the blade edge of the blade 301 is attached to the inner wall of the cooling water jacket 30, the blade surface of the blade 301 is inclined with respect to the inner wall of the cooling water jacket 30, and the bristles of the steel brush 302 are closely attached to the inner wall of the cooling water jacket 30. The scraper knife 301 can remove steel slag particles attached to the inner wall of the cooling water jacket 30, so that residual steel slag accumulation is avoided, the steel brush 302 can further clean the surface of the cooling water jacket 30, and the cooling effect is improved.

Preferably, as shown in fig. 2, the outer annular surface of the cooling water jacket 30 is fixedly connected with the inner wall of the slag pot 10 through an annular steel beam 12.

Specifically, as shown in fig. 5, 6, and 8, a first annular rail 33 and a second annular rail 34 are respectively disposed on the upper side and the lower side of the annular steel beam 12, the first annular rail 33 and the second annular rail 34 respectively form a rotating fit with the annular steel beam 12, the first cleaning head 31 is connected to the first annular rail 33 through a first cleaning bracket 35 disposed on the upper end of the cooling water jacket 30, the second cleaning head 32 is connected to the second annular rail 34 through a second cleaning bracket 36 disposed on the lower end of the cooling water jacket 30, and a driving member for driving the first annular rail 33 and the second annular rail 34 to rotate is disposed on the sidewall of the slag ladle 10. The outer annular surfaces of the first annular rail 33 and the second annular rail 34 are provided with gear rings, the inner annular surfaces of the first annular rail 33 and the second annular rail 34 are provided with flanges, the upper end and the lower end of the annular steel beam 12 are respectively provided with a plurality of grooved wheels 121 arranged at intervals along the circumferential direction of the annular steel beam 12, and the flanges of the first annular rail 33 and the second annular rail 34 are respectively clamped in the grooved wheels 121 on the upper side and the lower side of the annular steel beam 12 and form rolling fit with the grooved wheels 121. The driving member comprises a driving shaft 37 which is rotatably arranged on the side wall of the slag pot 10 along the vertical direction, a first gear 371 and a second gear 372 which are respectively meshed with gear rings on the first annular rail 33 and the second annular rail 34 are arranged on the driving shaft 37, and the driving shaft 37 is in transmission connection with a spindle of the second driving motor 13 through a first speed reducer.

Further, an annular baffle 13 is arranged at the upper part of the slag pot 10, the diameter of the annular baffle 13 is smaller than the inner diameter of the cooling water jacket 30, and the lower end of the annular baffle 13 is flush with the upper end of the cooling water jacket 30 or slightly lower than the upper end of the cooling water jacket 30. The steel brush 302 is a roller brush which is rotatably arranged along a vertical axis, and the rotating direction of the roller brush is the same as the rotating direction of the first cleaning head 31 and the second cleaning head 32. The upper end of the roller brush of the first cleaning head 31 is provided with a third gear 304, the outer wall of the annular baffle 13 is provided with an annular outer tooth surface 304 along the circumferential direction, and the third gear 304 is meshed with the annular outer tooth surface 304. The roller brush lower extreme of second cleaning head 32 is equipped with first band pulley 305, and first band pulley 305 constitutes the transmission cooperation through belt and the second band pulley 306 that sets up on the clean support 36 of second, be equipped with fourth gear 307 in the pivot of second band pulley 306, the fifth gear 308 meshing of rotating the setting on fourth gear 307 and the clean support 36 of second, the annular internal tooth surface meshing that sets up on fifth gear 308 and the slag ladle 10 inner wall. The upper end of the second cleaning head 32 is provided with a slag baffle plate, so that the second cleaning head 32 is prevented from being blocked due to accumulation of steel slag on the second cleaning head 32.

Preferably, the spraying device 14 comprises an annular spraying pipe arranged inside the annular baffle 13, and the annular spraying pipe is communicated with the cold water tank.

Preferably, as shown in fig. 2 and 9, the slag-water separation mechanism comprises a slag-water collecting tank 40, an overflow member is arranged at the upper end of the slag-water collecting tank 40, a slag sink 42 is arranged at the lower end of the slag-water collecting tank 40, the feed end of the slag dragging mechanism is positioned at the bottom of the slag sink 42, and an aerator pipe is arranged at the bottom of the slag-water collecting tank 40.

Specifically, the overflow component includes along the radial guiding gutter 41 that sets up of sediment water catch basin 40, the liquid level below of sediment water catch basin 40 is submerged into to the cell body of guiding gutter 41, the notch of guiding gutter 41 and the liquid level parallel and level of sediment water catch basin 40, and the pool wall setting that sediment water catch basin 40 was run through to the outer end of guiding gutter 41, and guiding gutter 41 outer end is equipped with the outlet, and this outlet communicates with the peripheral annular waste water catch basin 45 that sets up of sediment water catch basin 40. The liquid level top of sediment water catch pit 40 is equipped with wiper 43, the length direction of wiper 43 sets up along the radial of sediment water catch pit 40, and wiper 43 revolves the setting along the circumference of sediment water catch pit 40. An arched slag trap 401 is arranged above the diversion trench 41, the arched slag trap 401 and the liquid level of the slag water collecting tank 40 are arranged at intervals, and the interval area between the arched slag trap 401 and the diversion trench 41 forms a passage through which the scraper 43 passes. The bottom of the diversion trench 41 is gradually inclined downwards from the center to the edge of the slag-water collecting tank 40. Sediment groove 42 radially sets up in sediment water collecting pit 40 bottom along sediment water collecting pit 40, and the notch of sediment groove 42 and the bottom of the pool parallel and level of sediment water collecting pit 40, the bottom of the pool of sediment water collecting pit 40 are equipped with scum board 44, the length direction of scum board 44 is along the radial setting of sediment water collecting pit 40, and scum board 44 is along the circumference gyration setting of sediment water collecting pit 40. The sediment groove 42 communicates with the bypass pond 46 that the slag ladle 10 outside set up, the height of bypass pond 46 is unanimous with the height of slag-water collecting pool 40, drag for the sediment device to be scraper conveyor 47, scraper conveyor extends to in the bypass pond 46 from sediment groove 42 to upwards extend to the liquid level top in bypass pond 46. The slag water collecting tank 40 is provided with a turntable 48 at the center, the wiper 43 and the wiper 44 are fixedly connected with the turntable 48, and the first driving motor 11 is in transmission fit with the turntable 48 through a speed reducing mechanism. The working principle of the slag-water separation mechanism is as follows: the cooling water and the solidified steel slag fall into the slag water collecting tank 40 together, an aeration pipeline in the slag water collecting tank 40 impacts the steel slag to enable powder slag in the steel slag to be attached to bubbles and float above the slag water collecting tank 40, the bubbles above the liquid level are continuously pushed into the guide groove 41 and enter the annular waste water collecting tank 45 along the guide groove 41 along with the rotation of the scraper plate 43, on the other hand, the flushed steel slag sinks into the bottom of the slag water collecting tank 40, the steel slag is continuously pushed onto the scraper conveyor 47 in the slag settling groove 42 along with the rotation of the scraper plate 44, and finally the steel slag is conveyed to the outside of the slag tank 10 by the scraper conveyor to be dried and collected.

Further, a flue gas collecting pipeline 15 is arranged at the top of the slag pot 10 so as to collect and harmlessly treat the flue gas generated in the slag pot 10.

Preferably, as shown in fig. 10-15, the vacuum filtration device includes a liquid storage tank 50, a filtration roller 51, a suction device and a slag discharge device, the filtration roller 51 is rotatably disposed in the liquid storage tank 50, the axis of the filtration roller 51 is horizontally disposed, a filtration membrane is disposed on the wall of the filtration roller 51, a negative pressure chamber 513 is disposed on the inner side of the wall of the filtration roller 51, the negative pressure chamber 513 is communicated with the suction device, at least a part of the roller surface of the filtration roller 51 is submerged below the liquid level of the liquid storage tank 50, and the other part of the roller surface is exposed above the liquid level of the liquid storage tank 50; the slag discharging device is arranged corresponding to the roller surface of the filtering roller 51 above the liquid level of the liquid storage tank 50 and is used for removing mud cakes adsorbed on the roller surface and discharging the mud cakes from the upper part of the liquid storage tank 50. The filtering roller 51 is provided with an inner layer cylinder wall 512 and an outer layer cylinder wall 511, wherein the outer layer cylinder wall 511 is of a screen mesh structure, the inner layer cylinder wall 512 is of a solid plate structure, and the inner layer cylinder wall 512 and the outer layer cylinder wall 511 are arranged at intervals to form the negative pressure chamber 513. The inner layer cylinder wall 512 of the filtering roller 51 is fixedly connected with a roller shaft through spokes, the roller shaft is rotatably arranged on two opposite groove walls of the liquid storage tank 50, and the roller shaft is in transmission connection with a main shaft of a third driving motor 54 arranged on the side wall of the liquid storage tank 50 through a speed reducer. The liquid storage tank 50 is also internally provided with a fixing ring 55 coaxial with the filtering roller 51, the fixing ring 55 is fixedly connected with the wall of the liquid storage tank 50, the outer annular surface of the fixing ring 55 and the inner annular surface of the inner layer cylinder wall 512 of the filtering roller 51 form sliding fit, a liquid outlet hole 516 is arranged on the inner layer cylinder wall 512 in the area corresponding to the fixing ring 55, one side of the fixing ring 55, which is attached to the inner layer cylinder wall 512, is provided with a water suction groove 551, and the water suction groove 551 is connected with a vacuum pump through a pipeline. A movable partition plate 514 is arranged between the inner layer cylinder wall 512 and the outer layer cylinder wall 511, the length direction of the movable partition plate 514 is parallel to the axial direction of the filtering roller 51, the movable partition plates 514 are uniformly arranged along the circumferential direction of the filtering roller 51 at intervals, and the movable partition plates 514 are assembled to be capable of being switched between the following two stations: in the first working position, two sides of the movable partition 514 are respectively attached to the inner layer cylinder wall 512 and the outer layer cylinder wall 511, so that the negative pressure chamber 513 is divided into a plurality of independent spaces along the circumferential direction; in the second working position, at least one side of the movable partition plate 514 is separated from the inner layer cylinder wall 512 or the outer layer cylinder wall 511, so that the negative pressure chambers 513 on the two sides of the movable partition plate 514 are communicated. One side of the movable partition 514 is hinged with the inner wall 512, and the other side is blocked with a convex rib 515 arranged on the inner annular surface of the outer wall 511. The articulated shaft of the movable partition plate 514 protrudes out of the end part of the filtering roller 51, a deflector rod 517 is arranged on the articulated shaft of the protruding part, a guide wheel 303 is arranged at the top end of the deflector rod 517, the guide wheel 303 and an annular guide groove 56 arranged at the end part of the filtering roller 51 form rolling fit, the annular guide groove 56 is provided with a first stroke section 561 and a second stroke section 562, when the guide wheel 303 runs in the first stroke section 561, the movable partition plate 514 is in the first station state, and when the guide wheel 303 runs in the second stroke section 562, the movable partition plate 514 is in the second station state; the first travel section 561 and the second travel section 562 are smoothly transited. The first stroke section 561 is arranged corresponding to the end face of the filter roller 51 above the liquid level of the liquid storage tank 50, and the second stroke section 562 is arranged corresponding to the end face of the filter roller 51 below the liquid level of the liquid storage tank 50. The water suction groove 551 is arc-shaped, and the water suction groove 551 corresponds to the corresponding section of the second stroke section 562 on the filter drum 51. The slag discharging device comprises a scraper 52 and a conveyer belt 53, wherein the scraper 52 is obliquely arranged in the width direction, the higher side of the scraper 52 is attached to the outer wall of the filtering roller 51, and the conveyer belt 53 is positioned below the lower side of the scraper. The working principle of the vacuum filter device is as follows: waste water and steel slag flow into the liquid storage tank 50 after being separated, the third driving motor 54 drives the filter roller 51 to rotate at a low speed, meanwhile, the suction device sucks the negative pressure chamber 513, the waste water near the roller surface of the filter roller 51 is sucked into the negative pressure chamber 513 under the action of negative pressure, powder slag in the waste water is blocked outside the roller surface by the filter membrane, when the roller surface with the powder slag adsorbed is moved to a position above the liquid level of the liquid storage tank 50, the powder slag can be removed from the roller surface by the scraper blade and is conveyed out, and then secondary recovery of the powder slag is completed. According to the invention, a plurality of movable partition plates 514 are arranged in the negative pressure chamber 513, the connection and disconnection of each section of the negative pressure chamber 513 are realized by opening or closing the movable partition plates 514, so that the negative pressure chambers 513 below the liquid level of the liquid storage tank 50 are all connected with each other, the negative pressure chambers 513 above the liquid level are disconnected with each other, the negative pressure chambers 513 below the liquid level are connected with the suction pipeline, and the negative pressure chambers 513 above the liquid level are disconnected with the suction pipeline, so that the negative pressure chambers 513 above the liquid level can be prevented from being communicated with the atmosphere and losing pressure, in addition, the negative pressure chambers 513 below the liquid level are communicated with each other, the pressure of each section can be balanced.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims

1. The utility model provides a powder sediment secondary extraction element which characterized in that: the device comprises a liquid storage tank (50), a filtering roller (51), a suction device and a slag discharging device, wherein the filtering roller (51) is rotatably arranged in the liquid storage tank (50), the axis of the filtering roller (51) is horizontally arranged, a filter membrane is arranged on the wall of the filtering roller (51), a negative pressure chamber (513) is arranged on the inner side of the wall of the filtering roller (51), the negative pressure chamber (513) is communicated with the suction device, at least part of the roller surface of the filtering roller (51) is submerged below the liquid level of the liquid storage tank (50), and the other part of the roller surface is exposed above the liquid level of the liquid storage tank (50); the slag discharging device is arranged corresponding to the roller surface of the filtering roller (51) above the liquid level of the liquid storage tank (50) and is used for removing mud cakes adsorbed on the roller surface and discharging the mud cakes from the upper part of the liquid storage tank (50); the filtering roller (51) is provided with an inner layer of cylinder wall (512, 511) and an outer layer of cylinder wall (512, 511), wherein the outer layer of cylinder wall (511) is of a screen mesh structure, the inner layer of cylinder wall (512) is of a solid plate structure, and the inner layer of cylinder wall (512) and the outer layer of cylinder wall (511) are arranged at intervals to form the negative pressure cavity (513); the inner layer cylinder wall (512) of the filtering roller (51) is fixedly connected with a roller shaft through spokes, the roller shaft is rotatably arranged on two opposite groove walls of the liquid storage tank (50), and the roller shaft is in transmission connection with a main shaft of a third driving motor (54) arranged on the side wall of the liquid storage tank (50) through a speed reducer; a fixing ring (55) coaxial with the filtering roller (51) is further arranged in the liquid storage tank (50), the fixing ring (55) is fixedly connected with the wall of the liquid storage tank (50), the outer ring surface of the fixing ring (55) is in sliding fit with the inner ring surface of the inner layer cylinder wall (512) of the filtering roller (51), a liquid outlet hole (516) is formed in the area, corresponding to the fixing ring (55), of the inner layer cylinder wall (512), a water suction groove (551) is arranged on one side, attached to the inner layer cylinder wall (512), of the fixing ring (55), and the water suction groove (551) is connected with a vacuum pump through a pipeline; be equipped with movable partition plate (514) between inlayer section of thick bamboo wall (512) and outer section of thick bamboo wall (511), the length direction of movable partition plate (514) is parallel with the axial of filtering roller (51), movable partition plate (514) set up a plurality ofly along filtering roller (51) circumferencial direction evenly spaced, movable partition plate (514) are assembled and can be switched between following two stations: in the first station, two sides of a movable partition plate (514) are respectively attached to an inner layer cylinder wall (512) and an outer layer cylinder wall (511), so that the negative pressure chamber (513) is divided into a plurality of independent spaces along the circumferential direction; and in the second working position, at least one side of the movable partition plate (514) is separated from the inner layer cylinder wall (512) or the outer layer cylinder wall (511), so that the negative pressure chambers (513) at the two sides of the movable partition plate (514) are communicated in space.

2. The powder slag secondary extraction device of claim 1, wherein: one side of the movable partition plate (514) is hinged with the inner layer cylinder wall (512), and the other side is blocked with a convex rib (515) arranged on the inner annular surface of the outer layer cylinder wall (511).

3. The powder slag secondary extraction device of claim 2, characterized in that: the hinge shaft of the movable partition plate (514) protrudes out of the end part of the filtering roller (51), the hinge shaft of the protruding part is provided with a shift lever (517), the top end of the shift lever (517) is provided with a guide wheel (303), the guide wheel (303) and an annular guide groove (56) arranged at the end part of the filtering roller (51) form rolling fit, the annular guide groove (56) is provided with a first stroke section (561) and a second stroke section (562), when the guide wheel (303) travels in the first stroke section (561), the movable partition plate (514) is in the first station state, and when the guide wheel (303) travels in the second stroke section (562), the movable partition plate (514) is in the second station state; a smooth transition between the first stroke section (561) and the second stroke section (562).

4. The powder slag secondary extraction device of claim 3, wherein: the first stroke section (561) is arranged corresponding to the end face of the filter roller (51) above the liquid level of the liquid storage tank (50), and the second stroke section (562) is arranged corresponding to the end face of the filter roller (51) below the liquid level of the liquid storage tank (50).

5. The powder slag secondary extraction device of claim 4, wherein: the water suction groove (551) is arc-shaped, and the water suction groove (551) is consistent with the corresponding section of the second stroke section (562) on the filtering roller (51).

6. The powder slag secondary extraction device of claim 5, wherein: the slag discharging device comprises a scraper (52) and a conveying belt (53), the width direction of the scraper (52) is obliquely arranged, the higher side of the scraper (52) is attached to the outer wall of the filtering roller (51), and the conveying belt (53) is located below the lower side of the scraper.