Efficient sedimentation overflow device

Abstract

The utility model discloses an efficient sedimentation overflow device, which is characterized in that a sedimentation tank is provided with an overflow groove extending along the peripheral wall of the sedimentation tank, and a foam baffle is annular and is surrounded by the overflow groove, so that the sedimentation tank is divided into a slurry inlet area surrounded by the foam baffle and an overflow area positioned between the overflow groove and the foam baffle; the upper end of the foam baffle is higher than an overflow wall port of the overflow groove, the lower end of the foam baffle is lower than the overflow wall port of the overflow groove, and clear liquid in the sedimentation tank is suitable for overflowing to the overflow groove through the overflow area. Compared with the prior art, the foam baffle is partitioned and stopped, the clear liquid in the overflow area has little foam and suspended matters, and the subsequent production quality of the clear liquid is improved; clear liquid enters the annular overflow groove in an annular overflow mode, it is guaranteed that all points of a clear liquid layer in the sedimentation tank evenly flow, the retention time of the clear liquid in the sedimentation tank is shortened, the hydrolysis loss of aluminum oxide in the clear liquid is reduced, and the comprehensive recovery rate of aluminum oxide in ore is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to mineral precipitation thickening equipment, in particular to an efficient sedimentation overflow device. BACKGROUND ART

[0002] A sedimentation overflow device (thickener) is used to divert the clear liquid on the upper layer of the sedimentation tank to ensure the formation of a continuous and stable clear liquid layer and a slime layer in the sedimentation tank.

[0003] It is actually found that there are floating bubbles on the liquid surface of the sedimentation tank. Affected by the viscosity of the flocculant and the solution foam, a large amount of extremely fine and difficult-to-precipitate slime is suspended in the upper part of the clear liquid layer, resulting in a high content of floating substances in the clear liquid and affecting the quality of subsequent process production.

[0004] In addition, the current sedimentation tank of the enterprise has single-point pipe orifice overflow. The residence time of the clear liquid far from the overflow orifice is too long, and the hydrolysis loss of alumina in the clear liquid is proportional to the time, resulting in serious hydrolysis loss of alumina in the clear liquid and low recovery rate of alumina in the ore. CONTENTS OF THE UTILITY MODEL

[0005] The utility model aims to solve at least one of the above-mentioned technical problems, and provides an efficient sedimentation overflow device, which reduces the content of floating substances in the overflow clear liquid, shortens the residence time of the clear liquid, and improves the comprehensive recovery rate of alumina in the ore.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] An efficient sedimentation overflow device includes a sedimentation tank and a foam baffle. The sedimentation tank is provided with an overflow trough extending along the peripheral wall of the sedimentation tank. The foam baffle is annular and surrounded by the overflow trough, dividing the sedimentation tank into a slurry inlet area surrounded by the foam baffle and an overflow area located between the overflow trough and the foam baffle. The upper end of the foam baffle is higher than the overflow wall port of the overflow trough, and the lower end of the foam baffle is lower than the overflow wall port of the overflow trough. The clear liquid of the sedimentation tank is suitable for overflowing into the overflow trough through the overflow area.

[0008] Compared with the prior art, the beneficial effects of the present application include: through the partitioning and blocking of the foam baffle, there is very little foam in the clear liquid of the overflow area, and the clear liquid buffered by the overflow trough carries very few floating substances, improving the quality of the subsequent production of the clear liquid; the clear liquid enters the annular overflow trough through the annular overflow method, ensuring uniform flow of each point in the clear liquid layer in the sedimentation tank, reducing the residence time of the clear liquid in the sedimentation tank, reducing the hydrolysis loss of alumina in the clear liquid, and improving the comprehensive recovery rate of alumina in the ore.

[0009] As an improvement of the above technical solution, an inclined plate portion is provided at the lower end of the foam baffle, the lower end of the inclined plate portion deviates from the overflow groove relative to its upper end, and a cleaning and defoaming gap is formed between the inclined plate portion and the overflow wall.

[0010] As an improvement of the above technical solution, a trough cover is installed at the upper end of the sedimentation tank, and the lower end of the trough cover is connected to the foam baffle; the trough cover is rotatably connected to the rotating shaft of the rake frame, and a rake driving power mechanism is arranged on the trough cover, and the rake driving power mechanism is transmission-connected to the rotating shaft of the rake frame, and the scraper plate at the lower end of the rake frame is suitable for scraping the mineral mud at the bottom of the tank.

[0011] As an improvement of the above technical solution, the tank cover is provided with a defoaming spray pipe, and the defoaming spray pipe is suitable for spraying toward the slurry inlet area.

[0012] As an improvement of the above technical solution, the rotating shaft of the rake frame is connected with a driven gear, and the rake machine output shaft of the rake driving power mechanism is connected with a driving gear suitable for meshing with the driven gear.

[0013] As an improvement of the above technical solution, the upper end of the overflow wall is serrated.

[0014] As an improvement of the above technical solution, a drainage pipe connected to the bottom of the overflow trough is provided at the lower end of the drainage wall of the overflow trough.

[0015] As an improvement of the above technical solution, a plurality of drain pipes are arranged at intervals along the circumference of the overflow groove.

[0016] As an improvement of the above technical solution, the inner bottom of the overflow trough is higher on the inner side and lower on the outer side, and the drain pipe is suitable for connecting to the outer side of the inner bottom of the overflow trough.

[0017] As an improvement of the above technical solution, a slurry inlet pipe is arranged above the middle of the slurry inlet area, and the slurry inlet pipe is suitable for flowing the slurry down to the middle of the slurry inlet area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of a high-efficiency sedimentation overflow device according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 A cross-sectional view showing a high efficiency sedimentation overflow device;

[0021] Figure 3 for Figure 2 A partial structural schematic diagram of a high-efficiency sedimentation overflow device is shown;

[0022] Figure 4 is Figure 1 a partial structural schematic diagram of an efficient sedimentation overflow device after being sectioned from the front view angle.

[0023] The attached drawings are only one specific embodiment of the present invention, and the form and structure of this specific embodiment should not limit the expansion of other embodiments.

[0024] Sedimentation tank 100, overflow trough 110, overflow wall 111, liquid discharge wall 112, liquid discharge pipe 113,

[0025] Foam baffle 200, inclined plate part 210, clear liquid collection and defoaming gap 220;

[0026] Tank cover 300. Specific implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] Referring to Figures 1 to 4 , the present invention provides an efficient sedimentation overflow device, including a sedimentation tank 100 and a foam baffle 200. The sedimentation tank 100 is provided with an overflow trough 110 extending along the peripheral wall of the sedimentation tank 100. The foam baffle 200 is annular and surrounded by the overflow trough 110, dividing the sedimentation tank 100 into a slurry inlet area surrounded by the foam baffle 200 and an overflow area located between the overflow trough 110 and the foam baffle 200. The upper end of the foam baffle 200 is higher than the port of the overflow wall 111 of the overflow trough 110, and the lower end of the foam baffle 200 is lower than the port of the overflow wall 111 of the overflow trough 110. The clear liquid in the sedimentation tank 100 is suitable for overflowing into the overflow trough 110 through the overflow area.

[0029] In the embodiment of the present invention, the overflowed clear liquid is a sodium aluminate solution, and this clear liquid is suitable for recycling alumina, etc.

[0030] Referring to Figures 1 to 3In some settings, a slot cover 300 is mounted on the upper end of the sedimentation tank 100, and an angle steel / T-shaped steel suitable for connecting the foam baffle 200 is arranged at the lower end of the slot cover 300; in addition, the slot cover 300 can be used to rotate the rotating shaft connected to the rake frame, and a rake driving power mechanism is arranged on the slot cover 300, such as a rake driving machine directly driving the rake frame rotating shaft, and the rake driving machine can be a rake driving motor, a rake driving engine, and the rake driving machine can also be connected to the rake frame rotating shaft through a gear system, a belt, etc. Specifically, the rake frame is mainly immersed in the sedimentation tank 100, and its rotating shaft extends upward to rotate and connect the vertical mounting hole in the middle of the slot cover 300. The rake driving power mechanism drives the rake frame to rotate along the circumference of the sedimentation tank 100, and the scraper at the lower end of the rake frame is suitable for scraping the ore mud at the bottom of the pool, so that the ore mud is squeezed to the middle of the pool bottom, and a mud outlet is arranged in the middle of the pool bottom; when the mud outlet discharges the ore mud stably, it is required that there is continuous ore mud in the middle of the pool bottom to bury the mud outlet. The mud outlet pipe connected to the mud outlet can be inclined, or can be set in an auger manner, etc. It is known to those skilled in the art that the scraper blade is inclined relative to the radial direction of the sedimentation tank 100, and when the scraper blade scrapes, it guides the ore mud to squeeze to the middle of the bottom of the tank.

[0031] Reference Figure 1 , Figure 2 The inner bottom of the trough cover 300 is suitable as a workbench, suitable for workers to walk and stand, and the side wall of the trough cover 300 is suitable as a guardrail. The rake machine can be a gasoline engine, a diesel engine, a hydraulic motor, an electric motor, etc.

[0032] Preferably, the rotating shaft of the rake frame is connected with a driven gear, and the output shaft of the rake driving machine is connected with a driving gear suitable for meshing with the driven gear.

[0033] In some configurations, the sedimentation tank 100 is provided with a column extending upward from the bottom of the tank, one end of the rake frame is rotatably connected to the column, and the other end is supported on the upper edge of the sedimentation tank 100 through a roller, and the roller is connected to the rake drive on the rake frame. In addition, the foam baffle 200 is installed on the rake frame and rotates with the rake frame; or, the inner wall of the sedimentation tank 100 is provided with a bracket suitable for supporting the foam baffle 200, such as a plurality of inner extension beams.

[0034] Reference Figure 3 , Figure 4 In the partial setting of the overflow tank 110, the lower end of the drainage wall 112 is provided with a drainage pipe 113 connected to the bottom of the overflow tank 110; further, referring to Figure 1 , Figure 2 A plurality of drain pipes 113 are arranged at intervals along the circumference of the overflow trough 110, and the overflow trough 110 quickly discharges the clear liquid to the collection device / alumina recovery device. In some configurations, the drain wall 112 is lower than the overflow wall 111, and the clear liquid collected by the overflow trough 110 is discharged through the drain wall 112.

[0035] On the other hand, the tank cover 300 is provided with an antifoam spray pipe, or an antifoam spray pipe is erected above the sedimentation tank 100. The upper end of the foam baffle 200 is higher than the overflow trough 110, making it difficult for the spray to drive the foam towards the overflow area.

[0036] The operation process of the present utility model is as follows: The feed pipe is connected to equipment such as a flotation machine. The feed pipe supplies pulp to the feed area. The pulp is sedimentationally separated into slime and clear liquid. The slime is suitable for settling at the bottom of the sedimentation tank 100, and the clear liquid is suitable for floating on the upper layer of the sedimentation tank 100.

[0037] The foam generated by the incoming pulp is suitable for being sprayed by the antifoam spray pipe, so that the foam is broken and / or dissolved by the liquid droplets, etc.

[0038] According to the principle of communicating vessels, the clear liquid flows through the overflow area, overflows the overflow wall 111, and flows into the overflow trough 110. For the overflow direction of the clear liquid, refer to Figure 3 and Figure 4 the directions of V1, V2, and V3 shown. The sedimentation tank overflows the clear liquid in the form of an overflow ring trough, and a continuous and stable clear liquid layer and mud layer are formed in the sedimentation tank.

[0039] The overflow trough 110 discharges the clear liquid outward to a collecting tank / aluminum oxide recovery equipment to recover aluminum oxide, etc. The slime at the bottom of the sedimentation tank 100 is suitable for being discharged to a filter press, etc.

[0040] Compared with the prior art, the beneficial effects of the present application include: The port of the overflow wall 111 surrounding the overflow area is lower than the upper end of the foam baffle 200 and higher than the lower end of the foam baffle 200. The clear liquid in the feed area enters the annular overflow trough 110 from the lower edge part of the foam baffle according to the principle of communicating vessels. The foam surging in the feed area is less likely to flow into the overflow area. The clear liquid in the overflow area has very little foam. The clear liquid buffered in the overflow trough 110 carries very few floating substances, improving the subsequent production quality of the clear liquid; The clear liquid enters the annular overflow trough 110 through the annular overflow method, rather than overflowing the clear liquid through a single pipe port, ensuring uniform flow of each point in the clear liquid layer in the sedimentation tank, avoiding the formation of a clear liquid dead zone in the feed area, reducing the residence time of the clear liquid in the sedimentation tank, reducing the hydrolysis loss of aluminum oxide in the clear liquid, and improving the comprehensive recovery rate of aluminum oxide in the ore.

[0041] In some embodiments of the present utility model, a feed pipe is provided above the middle of the feed area. The feed pipe is suitable for dropping the pulp towards the middle of the feed area. The falling of the pulp drives the clear liquid to be squeezed outwards, that is, the clear liquid is quickly squeezed towards the overflow area based on the mechanism of communicating vessels, and then overflows to the overflow trough 110, further reducing the residence time of the clear liquid in the sedimentation tank 100 and further eliminating the clear liquid dead zone in the feed area. Specifically, the feed pipe can be laid on the tank cover 300.

[0042] Refer to Figure 3 、 Figure 4, in some embodiments of the present utility model, a sloping plate portion 210 is provided at the lower end of the foam baffle 200. The lower end of the sloping plate portion 210 deviates from the upper end thereof relative to the overflow trough 110, and a clear liquid collecting and defoaming gap 220 is formed between the sloping plate portion 210 and the overflow wall 111. In the present utility model, the space at the lower end of the overflow area is enlarged, the window for collecting clear liquid is enlarged, so that the clear liquid in the sedimentation tank 100 can overflow to the overflow trough 110 fully and quickly; in addition, the clear liquid collecting and defoaming gap 220 is a gap that is larger at the bottom and smaller at the top. Even if the clear liquid floating to the overflow area contains bubbles, the bubbles are burst by congestion and merger; in addition, the lower end of the annular sloping plate portion 210 extends to the middle of the bottom of the sedimentation tank 100. The sloping plate portion 210 is suitable for guiding the slime in the slurry inlet area to the middle of the bottom of the sedimentation tank 100, improving the stability of the clear liquid in the overflow area and reducing the sludge scraping power of the rake frame.

[0043] Refer to Figure 2 , further, a slime collecting trough is provided in the middle of the bottom of the sedimentation tank, and a sludge outlet is provided at the bottom of the sludge receiving trough, so as to collect the slime in the middle of the bottom of the tank away from the sludge scraping plate on the bottom of the tank, eliminating the useless work of the rake frame.

[0044] Refer to Figures 1 to 4 , in some embodiments of the present utility model, the upper end of the overflow wall 111 is serrated, so that the clear liquid overflowing from the overflow area to the overflow trough 110 is more homogenized, and the overflow area overflows evenly without dead zones; on the other hand, the serrated notch at the upper end of the overflow wall 111 also further facilitates the merger and dissolution of possible bubbles. In addition, while maintaining the slurry inlet volume, the setting of the serrated notch makes the overflow area of the overflow wall 111 increase upward along the vertical direction. In fact, the overflow area of the overflow wall 111 becomes smaller, reducing the influence of the overflow non-uniformity caused by the horizontal error at the port of the overflow wall 111 and eliminating the single-slope overflow caused by the common horizontal error of the barrel mouth in daily life.

[0045] Refer to Figure 3 、 Figure 4 , in some embodiments of the present utility model, the inner bottom of the overflow trough 110 is higher on the inner side and lower on the outer side, and the drain pipe 113 is suitable for communicating with the outer side of the inner bottom of the overflow trough 110.

[0046] The above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Any modification or equivalent replacement that does not depart from the spirit and scope of the present utility model shall be covered by the technical solutions of the present utility model.

Claims

1. An efficient sedimentation overflow device, characterized in that, include: A sedimentation tank is provided with an overflow trough extending along the peripheral wall of the sedimentation tank; The foam baffle is annular and surrounded by the overflow trough, so that the sedimentation tank is divided into a slurry inlet area surrounded by the foam baffle and an overflow area located between the overflow trough and the foam baffle. The upper end of the foam baffle is higher than the overflow wall port of the overflow trough, and the lower end of the foam baffle is lower than the overflow wall of the overflow trough. The clear liquid in the sedimentation tank is suitable for overflowing into the overflow trough through the overflow area.

2. The efficient sedimentation overflow device according to claim 1, characterized in that The lower end of the foam baffle is provided with an inclined plate portion, the lower end of the inclined plate portion is offset from the overflow groove relative to the upper end thereof, and a cleaning and defoaming gap is formed between the inclined plate portion and the overflow wall.

3. The high-efficiency sedimentation overflow device according to claim 1, wherein A trough cover is mounted on the upper end of the sedimentation tank, and the lower end of the trough cover is connected to the foam baffle; the trough cover is rotatably connected to the rotating shaft of the rake frame, and a rake driving power mechanism is arranged on the trough cover, and the rake driving power mechanism is transmission-connected to the rotating shaft of the rake frame, and the scraper plate at the lower end of the rake frame is suitable for scraping the mineral mud at the bottom of the tank.

4. The high-efficiency sedimentation overflow device according to claim 3, characterized in that The tank cover is provided with a defoaming spray pipe, and the defoaming spray pipe is suitable for spraying toward the slurry inlet area.

5. The high-efficiency sedimentation overflow device according to claim 3, characterized in that The rotating shaft of the rake frame is connected with a driven gear, and the rake machine output shaft of the rake driving power mechanism is connected with a driving gear suitable for meshing with the driven gear.

6. The high-efficiency sedimentation overflow device according to any one of claims 1 to 5, characterized in that The upper end of the overflow wall is sawtooth-shaped.

7. The high-efficiency sedimentation overflow device according to any one of claims 1 to 5, characterized in that A drainage pipe communicating with the bottom of the overflow trough is arranged at the lower end of the drainage wall of the overflow trough.

8. The high-efficiency sedimentation overflow device according to claim 7, characterized in that, A plurality of drain pipes are arranged at intervals along the circumference of the overflow groove.

9. The efficient sedimentation overflow device according to claim 7, characterized in that, The inner bottom of the overflow trough is higher on the inner side and lower on the outer side, and the drain pipe is suitable for connecting to the outer side of the inner bottom of the overflow trough.

10. The high-efficiency sedimentation overflow device according to any one of claims 1 to 5, characterized in that, A slurry inlet pipe is arranged above the middle of the slurry inlet area, and the slurry inlet pipe is suitable for flowing the ore slurry down to the middle of the slurry inlet area.

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