Pre-concentration device of thickener

Abstract

The utility model belongs to the field of concentrate flotation, and particularly relates to a pre-concentration device of a thickener. According to the scheme, the regrinding device comprises a regrinding hydrocyclone and a regrinding moxa sand mill, a three-way valve and a gate valve are fixedly connected to a flow raising pipe, an outlet of the three-way valve is communicated with the regrinding hydrocyclone and a mixed flotation ore thickener, a sand settling pipe of the regrinding hydrocyclone is communicated with an inlet of the regrinding moxa sand mill, an outlet of the regrinding moxa sand mill is communicated with a sand settling box, and the sand settling box is communicated with the mixed flotation ore thickener. And an overflow pipe of the sand settling box and an overflow pipe of the regrinding cyclone are communicated with an inlet of the mixed flotation ore thickener. According to the scheme, the working load of the mixed flotation ore thickener is reduced, and the problem that after the load of the mixed flotation ore thickener is increased, the mixed flotation ore thickener is likely to muddy to cause metal loss is solved; and meanwhile, fine concentrates are introduced into the mixed flotation ore thickener, and the difference between the sizes of concentrate particles is reduced, so that the input of a flocculating agent of the thickener can be controlled more accurately, the cost can be controlled accurately, and the load of the mixed flotation ore thickener is reduced.

Description

Technical Field

[0001] The present invention relates to the field of concentrate flotation, and specifically relates to a thickener pre-concentration device. Background Art

[0002] After a mineral processing plant feeds coarse concentrate into a flotation thickener through a lifting pipe, the flotation thickener's limited settling capacity makes it difficult for the fine fraction to settle. This increases the load on the flotation thickener, leading to turbidity in the flotation thickener and a certain amount of metal loss. To reduce this metal loss, patent CN205966188U installs a stilling plate within the thickener's central inlet barrel. This reduces the impact on the thickener's sedimentation layer, preventing the thickener overflow from becoming turbid and minimizing metal loss. While installing a stilling plate mitigates this impact on the thickener's sedimentation layer, it sacrifices sedimentation speed and reduces sedimentation efficiency. Utility Model Content

[0003] The purpose of this solution is to provide a thickener pre-concentration device to solve the problem that after increasing the load of the mixed flotation ore thickener, the mixed flotation ore thickener is prone to turbidity and metal loss.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a thickener pre-concentration device, comprising a regrinding cyclone and a regrinding sand mill. A tee and a gate valve are fixedly connected to the lifting pipe. The outlet of the tee is respectively connected to the regrinding cyclone and the mixed float ore thickener. The sand settling pipe of the regrinding cyclone is connected to the inlet of the regrinding sand mill. The outlet of the regrinding sand mill is connected to a sand settling box. A sand settling box overflow pipe is provided on the top of the sand settling box. The sand settling box overflow pipe and the regrinding cyclone overflow pipe are connected to the inlet of the mixed float ore thickener.

[0005] The principle and effect of this scheme are as follows: the regrinding cyclone separates the mixed coarse concentrate into coarse concentrate and fine concentrate, the fine concentrate enters the mixed flotation ore thickener through the overflow of the regrinding cyclone, the coarse concentrate enters the regrinding sand mill to be ground into fine concentrate, and then the fine concentrate is placed in the sedimentation tank for precipitation and collection. At the same time, the overflow of the sedimentation tank also contains a small amount of fine concentrate. The overflow of the sedimentation tank and the overflow of the regrinding cyclone are passed together into the mixed flotation ore thickener for concentration and precipitation, and the fine concentrate in the sedimentation tank is collected.

[0006] This solution adds a tee and a gate valve to connect the pre-concentrator and the mixed flotation thickener to the tee. After increasing the load of the mixed flotation thickener, the mixed coarse concentrate is passed into the pre-concentrator through the gate valve. The pre-concentrator performs preliminary separation, grinding, and collection on the mixed coarse concentrate, and then the mixed flotation thickener is used to collect and concentrate the fine concentrate not collected by the pre-concentrator. This solution not only reduces the workload of the mixed flotation thickener, but also solves the problem of turbidity and metal loss caused by increasing the load of the mixed flotation thickener. At the same time, the mixed flotation thickener is fed with fine concentrate, reducing the difference in concentrate particle size. This allows for more precise control of the flocculant input into the mixed flotation thickener, which is beneficial for precise cost control. It also allows for more precise control of the flocculation rate of the fine concentrate by controlling the flocculant input, which is beneficial for controlling the concentration rate and efficiency of the mixed flotation thickener.

[0007] Furthermore, a pump pool is provided between the overflow pipe of the sedimentation box and the overflow pipe of the regrinding cyclone and the inlet of the mixed flotation ore thickener, and the outlet of the pump pool is communicated with the mixed flotation ore thickener.

[0008] The fine concentrate in the overflow of the settling box and the overflow of the regrinding cyclone is easy to settle in the overflow, and the settled fine concentrate is easy to clog the pipeline. The pump pool can press the fine concentrate in the overflow pipe into the mixed flotation thickener to avoid the overflow pipe being clogged by the fine concentrate; at the same time, the pump pool can also control and adjust the overflow flow rate, thereby controlling the feed rate of the mixed flotation thickener.

[0009] Furthermore, the sand settling box is also connected to a water inlet pipe, and the water inlet pipe puts clean water into the sand settling box.

[0010] By introducing a water inlet pipe into the sand settling box, the drug can be removed through dilution with clean water and backwashing, and the concentration of the re-grinding sand can be adjusted, while the influence of the residual reagents in the return water on the copper-zinc separation index in the mixed coarse concentrate can be greatly reduced.

[0011] Furthermore, a spring is fixedly connected between the upper end of the filter screen of the re-grinding moxa sand mill and the inner wall of the re-grinding moxa sand mill, the filter screen is slidably connected to the inner wall, and a cleaning rake is rotatably connected to the outer side of the filter screen. The cleaning rake rotates relative to the filter screen as the filter screen slides, and a plurality of cleaning nails are fixedly connected to the cleaning rake. When the cleaning rake is in contact with the filter screen, the cleaning nails are embedded in the filter holes of the filter screen.

[0012] The widely used horizontal sand mill adopts traditional filter grading. The traditional filter is generally cylindrical in shape. The cylindrical surface is composed of radial steel wire strips and circumferential steel wire strips. There are densely arranged through holes between the steel wire strips. The traditional filter grading controls the product particle size by the size of the filter aperture. Fine particles smaller than the filter aperture can go out, while those larger than the aperture are retained. This traditional filter grading system has the disadvantage of being easily clogged. This solution adds a spring to the upper end of the filter. The more clogged particles accumulated in the filter, the heavier the filter, and the longer the spring is stretched. As the filter slides down, the cleaning rake connected to the filter rotates toward the filter. When the cleaning rake rotates to fit the filter, the cleaning pins are embedded in the filter holes of the filter, pushing out the clogged particles in the filter. The weight of the filter becomes lighter, and the spring releases the accumulated elastic potential energy to make the filter slide down. As the filter slides down, the fine concentrate particles continuously released by the regrinding sand mill push the cleaning rake away from the filter. The cleaning rake turns away from the filter under the influence of the thrust and its own gravity. The cleaning method of the cleaning rake can clean the clogged particles in the filter in time when the filter is clogged, solving the problem of easy clogging of the traditional filter grading system. At the same time, the cleaning rake does not take much time to clean the filter, which reduces the impact on the discharge of the regrinding sand mill and ensures the operating efficiency of the pre-concentration device.

[0013] Furthermore, the cleaning rake further comprises a mesh plate, the cleaning nails are perpendicular to the mesh plate, and the flat ends of the cleaning nails are fixedly connected to the mesh plate.

[0014] The setting of the mesh plate allows the cleaning rake to allow fine particles to pass through. During the cleaning process, the fine particles passing through the filter can also pass smoothly through the mesh plate of the cleaning rake, reducing the accumulation of particles inside the filter during the cleaning process, further reducing the impact on the discharge of the regrinding sand mill, and ensuring the operating efficiency of the pre-concentration device; at the same time, when the cleaning rake does not overlap with the filter, the fine concentrate particles passing through the filter can also pass through the mesh plate smoothly, so that there will be no accumulation of fine concentrate particles on the mesh plate, avoiding the accumulation of fine concentrate on the cleaning rake and affecting the cleaning effect of the cleaning rake, so that the cleaning rake can work efficiently for a long time.

[0015] Furthermore, a rotating shaft is fixedly connected to one side of the cleaning rake, and the rotating shaft is rotatably connected to the lower end of the outer side of the filter screen. A limiting block is fixedly connected to the inner wall below the rotating shaft. When the filter screen is at the highest position, the rotating shaft is located above the limiting block. When the filter screen slides down, the rotating shaft slides down with the filter screen to below the limiting block, and the cleaning rake rotates tiltedly under the support of the limiting block.

[0016] When the filter is at the highest position, the rotating shaft is above the limit block, and the mesh plate of the cleaning rake is parallel to the inner wall. When the filter slides down, the rotating shaft and the filter slide synchronously to the bottom of the limit block. The cleaning rake is supported by the limit block. At the same time, the rotating shaft on the side of the cleaning rake continuously presses down the cleaning rake, causing the cleaning rake to tilt, and the degree of the cleaning rake cutting is controlled by the sliding distance of the filter.

[0017] Furthermore, scrapers are fixedly connected to both sides of the lower end of the filter screen, the scrapers are made of soft material, and the scrapers are slidably connected to the inner wall.

[0018] There is a gap between the filter and the inner wall. The scraper can not only prevent the fine concentrate particles from falling into the gap below the filter, but also scrape out the fine concentrate particles accumulated between the filter and the inner wall during the process of the filter sliding up and down, thus avoiding the accumulation of fine concentrate to form an obstacle to the filter sliding down.

[0019] Furthermore, the limiting block is a grid plate, and the grid hole is perpendicular to the inner wall.

[0020] The limit block is a grid plate which can provide limit support for the cleaning rake while not hindering the discharge of fine concentrate particles passing through the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the grinding structure of the re-grinding moxa sand in an embodiment of the present utility model.

[0022] Figure 2 for Figure 1 Schematic diagram of the enlarged structure A.

[0023] The following is a further detailed description through specific implementation methods:

[0024] The reference numerals in the drawings of the specification include: 1. inner wall; 2. spring; 3. cleaning nail; 4. mesh plate; 5. limit block; 6. rotating shaft; 7. scraper; 8. filter screen. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments to fully understand the purpose, features and effects of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention:

[0026] Example 1

[0027] Example 1 is basically as shown in the attached Figure 1-2 shown.

[0028] A thickener pre-concentrator includes a regrinding cyclone and a regrinding sand mill. A tee and a gate valve are fixedly connected to the lifting pipe. The tee outlets are connected to the regrinding cyclone and the mixed flotation thickener, respectively. The tee can divert the mixed coarse concentrate, distributing some of the mixed coarse concentrate to the regrinding cyclone, and the gate valve can adjust the distribution ratio of the mixed coarse concentrate. The regrinding cyclone settling pipe is connected to the regrinding sand mill inlet, and the regrinding sand mill outlet is connected to a settling box. The settling box has an overflow pipe installed above it and is also connected to a water inlet pipe that discharges clean water into the settling box. The settling box overflow pipe and the regrinding cyclone overflow pipe are connected to a pump sump, and the pump sump outlet is connected to the mixed flotation thickener.

[0029] The regrinding cyclone uses the FX250 cyclone, and the mixed flotation thickener uses a high-efficiency thickener with a thickening tank diameter of 22m.

[0030] like Figure 1 As shown, the horizontal moxa sand mill is selected for the re-grinding moxa sand mill, and the filter screen 8 of the re-grinding moxa sand mill is located at the tail of the re-grinding moxa sand mill ( Figure 1 A structure in ).

[0031] like Figure 2 As shown, a spring 2 is fixedly connected between the upper end of the filter screen 8 of the regrinding moxa sand mill and the inner wall 1 of the regrinding moxa sand mill. The filter screen 8 is slidably connected to the inner wall 1. A cleaning rake is rotatably connected to the outer side of the filter screen 8. The cleaning rake includes a mesh plate 4 and cleaning pins 3. The cleaning pins 3 are perpendicular to the mesh plate 4. The flat ends of the cleaning pins 3 are fixedly adhered to the mesh plate 4. A rotating shaft 6 is fixedly connected to one side of the cleaning rake. The rotating shaft 6 is rotatably connected to the lower end of the outer side of the filter screen 8. A limit block 5 is fixedly adhered to the inner wall 1 below the rotating shaft 6. The limit block 5 is a grid plate with a grid hole perpendicular to the inner wall 1. When the filter screen 8 is at its highest position, the rotating shaft 6 is located above the limit block 5 (at this time, the angle between the cleaning rake and the upper end of the filter screen 8 is not less than 90°). When the filter screen 8 slides down, the rotating shaft 6 slides down with the filter screen 8 to below the limit block 5, and the cleaning rake rotates tiltedly under the support of the limit block 5 (the angle between the cleaning rake and the upper end of the filter screen 8 is less than 90°). When the filter screen 8 is at its lowest position, the cleaning rake is in contact with the filter screen 8 (at this time, the angle between the cleaning rake and the upper end of the filter screen 8 is less than 5°), and the cleaning nails 3 are embedded in the filter holes of the filter screen 8 to push out the clogged particles in the filter holes of the filter screen 8.

[0032] like Figure 2 As shown, scrapers 7 are fixedly bonded to both sides of the lower end of the filter screen 8. The scrapers 7 are made of soft rubber and are slidably connected to the inner wall 1. When the filter screen 8 slides downward, the scrapers 7 slide below the inner wall 1, and fine concentrate particles accumulate between the inner wall 1 above the scrapers 7 and the filter screen 8. When the filter screen 8 slides upward, the scrapers 7 slide above the inner wall 1, and the fine concentrate particles are scraped by the scrapers 7 onto the inner wall 1 on both sides of the filter screen 8.

[0033] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A thickener pre-concentration device, characterized in that: include: The regrinding cyclone and the regrinding moxa mill are fixedly connected with a tee and a gate valve on the lifting pipe. The tee outlet is respectively connected to the regrinding cyclone and the mixed float ore thickener. The regrinding cyclone sedimentation pipe is connected to the regrinding moxa mill inlet. The regrinding moxa mill outlet is connected to the sedimentation box. The sedimentation box overflow pipe is provided on the top of the sedimentation box. The sedimentation box overflow pipe and the regrinding cyclone overflow pipe are connected to the mixed float ore thickener inlet.

2. A thickener pre-concentration device according to claim 1, characterized in that: A pump pool is provided between the overflow pipe of the sedimentation box and the overflow pipe of the regrinding cyclone and the inlet of the mixed flotation ore thickener, and the outlet of the pump pool is communicated with the mixed flotation ore thickener.

3. The thickener pre-concentration device according to claim 1, characterized in that: The sand settling box is also connected to a water inlet pipe, and the water inlet pipe puts clean water into the sand settling box.

4. The thickener pre-concentration device according to claim 1, characterized in that: A spring is fixedly connected between the upper end of the filter screen of the re-grinding moxa sand mill and the inner wall of the re-grinding moxa sand mill, the filter screen is slidably connected to the inner wall, and a cleaning rake is rotatably connected to the outer side of the filter screen. The cleaning rake rotates relative to the filter screen when sliding with the filter screen, and a plurality of cleaning nails are fixedly connected to the cleaning rake. When the cleaning rake is in contact with the filter screen, the cleaning nails are embedded in the filter holes of the filter screen.

5. A thickener pre-concentration device according to claim 4, characterized in that: The cleaning rake further comprises a mesh plate, the cleaning nails are all perpendicular to the mesh plate, and the flat ends of the cleaning nails are fixedly connected to the mesh plate.

6. The thickener pre-concentration device according to claim 4, characterized in that: A rotating shaft is fixedly connected to one side of the cleaning rake, and the rotating shaft is rotatably connected to the lower end of the outer side of the filter screen. A limiting block is fixedly connected to the inner wall below the rotating shaft. When the filter screen is at the highest position, the rotating shaft is located above the limiting block. When the filter screen slides down, the rotating shaft slides down to below the limiting block with the filter screen, and the cleaning rake rotates tiltedly under the support of the limiting block.

7. The thickener pre-concentration device according to claim 4, characterized in that: Scrapers are fixedly connected to both sides of the lower end of the filter screen. The scrapers are made of soft material and are slidably connected to the inner wall.

8. The thickener pre-concentration device according to claim 6, characterized in that: The limiting block is a grid plate, and the grid hole is perpendicular to the inner wall.

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