Fine sand recovery device

Abstract

The utility model discloses a fine sand recovery device which comprises a high-frequency dewatering screen, a hydrocyclone, a vacuum dewatering device and accessory components of the vacuum dewatering device. The high-frequency dewatering screen is used for preliminarily removing large-particle impurities in the wastewater; the hydrocyclone is used for concentrating and separating fine sand; the vacuum dewatering device achieves efficient dewatering and drying of fine sand through a rotary drum, a water filtering gauze element, a sand scraping knife and other structures. And the first slurry pump, the second slurry pump, the water collecting tank and the sand conveying belt are arranged in the device, so that continuous transmission and cyclic utilization of materials are ensured. According to the device, automatic control is adopted, energy utilization is optimized, the fine sand recovery rate is remarkably increased, water resource consumption is reduced, energy conservation, emission reduction and resource recycling are achieved, and the device plays an important role in environment protection and economic benefit improvement of the mineral resource processing industry. The device is compact in structure, easy and convenient to operate, suitable for sandstone production lines of various scales and beneficial to promotion of sustainable development of the industry.

Description

Technical Field

[0001] The utility model relates to the technical field of sand and stone processing, in particular to a fine sand recovery device. Background Art

[0002] In the mineral resource processing industry, especially in the sand and gravel production line, sand washing is an indispensable link to remove the dirt and other impurities on the surface of the sand and gravel to ensure the quality of the product. However, this process will produce a large amount of wastewater containing fine sand. If it is not treated, it will not only cause a huge waste of resources, but also cause serious pollution to the environment. Traditional fine sand recovery methods mostly use natural sedimentation in sedimentation tanks or simple mechanical dehydration. These methods generally have problems such as low recovery efficiency, large footprint, high water consumption, and high water quality requirements, which are difficult to meet the requirements of modern environmental protection and resource conservation. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a fine sand recovery device, which is used to achieve efficient recovery of fine sand, while reducing energy consumption and lowering operating costs.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a fine sand recovery device, comprising a high-frequency dewatering screen, a slurry receiving box is provided at the output end of the high-frequency dewatering screen, a first slurry feeding pipe is provided on the slurry receiving box, the first slurry feeding pipe is connected to the hydrocyclone, a slurry receiving groove is provided at the bottom of the hydrocyclone, a second slurry feeding pipe is provided at one end of the slurry receiving groove, and the second slurry feeding pipe is connected to the vacuum dewatering device;

[0005] The vacuum dehydration device is a box-type structure, and a rotating drum is arranged inside the vacuum dehydration device. The rotating drum includes a central hollow rotating shaft and a plurality of support plates radially arranged on the hollow rotating shaft, and a water filter mesh is covered on the outside of the plurality of support plates;

[0006] An inclined scraper is arranged on one side of the vacuum dehydration device, the higher bottom end of the scraper is arranged in contact with the upper circular surface of the water filter screen, and the lower end of the scraper extends above the input end of the sand conveying belt.

[0007] In a preferred solution, a first slurry pump is provided on the first slurry delivery pipe, and a second slurry pump is provided on the second slurry delivery pipe.

[0008] In a preferred solution, the hydrocyclone comprises a plurality of hydrocyclones, and the plurality of hydrocyclones are fixedly arranged on the same hydrocyclone bracket;

[0009] The first slurry delivery pipe is connected to the input port of the hydrocyclone at one end, and the water outlet at the top of the hydrocyclone is connected to the input port of the next hydrocyclone.

[0010] In a preferred solution, a slurry outlet is provided at the bottom of the hydrocyclone, and the lower end of the slurry outlet is located in the slurry receiving tank.

[0011] In a preferred solution, the inner bottom surface of the slurry receiving groove is an inclined surface, which is arranged to be inclined downward along the mortar conveying direction.

[0012] In a preferred solution, a slurry retaining plate is provided on the inner wall of the vacuum dehydration device on the side of the rotating drum close to the second slurry feeding pipe. The slurry retaining plate has the same inclination direction as the scraper and the scraper is also arranged in contact with the upper circular surface of the water filter screen.

[0013] In a preferred solution, a water collecting box is provided below the vacuum dehydration device, and a water outlet pipe is provided at the bottom of the vacuum dehydration device, and the water outlet pipe is located above the water collecting box.

[0014] In a preferred solution, one end of the hollow shaft passes through the side wall of the vacuum dehydration device and extends outside the vacuum dehydration device, and an air hole is provided on the hollow shaft portion located in the vacuum dehydration device;

[0015] A negative pressure pipe is movably connected to the end of the hollow rotating shaft outside the vacuum dehydration device.

[0016] In a preferred solution, a pulley is provided on the hollow rotating shaft portion outside the vacuum dehydration device, and the driving device realizes the self-rotation drive of the rotating drum through a synchronous transmission belt in cooperation with the pulley.

[0017] The fine sand recovery device provided by the utility model has the following beneficial effects by adopting the above structure:

[0018] (1) The high-frequency dewatering screen is used as the preliminary treatment unit to effectively remove large particle impurities in the wastewater. The subsequent fine separation effect of the hydrocyclone can greatly improve the recovery rate of fine sand. The vacuum dewatering device further improves the dryness of the fine sand and ensures the quality of the recovered sand.

[0019] (2) The use of the water filter screen and the scraper inside the drum, as well as the introduction of the vacuum dehydration device, greatly reduced the energy consumption during the dehydration process. At the same time, by optimizing the use of the slurry pump, unnecessary energy loss was reduced, making the overall system operation more economical and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] Figure 2 It is a schematic diagram of the rotary drum structure of the utility model.

[0023] Figure 3It is a schematic diagram of the hollow shaft structure of the utility model.

[0024] In the figure: high-frequency dewatering screen 1, slurry receiving box 2, first slurry delivery pipe 3, first slurry pump 4, hydrocyclone 5, slurry outlet 501, water outlet 502, hydrocyclone bracket 6, slurry receiving trough 7, second slurry delivery pipe 8, second slurry pump 9, vacuum dewatering device 10, rotating drum 11, slurry baffle 12, sand scraper 13, water outlet pipe 14, water collecting box 15, sand delivery belt 16, water filter mesh 17, support plate 18, hollow rotating shaft 19, pulley 20, synchronous transmission belt 21, negative pressure pipe 22. DETAILED DESCRIPTION

[0025] like Figure 1-3 A fine sand recovery device includes a high-frequency dewatering screen 1, a slurry receiving box 2 is provided at the output end of the high-frequency dewatering screen 1, a first slurry feeding pipe 3 is provided on the slurry receiving box 2, the first slurry feeding pipe 3 is connected to a hydrocyclone 5, a slurry receiving groove 7 is provided at the bottom of the hydrocyclone 5, a second slurry feeding pipe 8 is provided at one end of the slurry receiving groove 7, and the second slurry feeding pipe 8 is connected to a vacuum dewatering device 10;

[0026] The vacuum dehydration device 10 is a box-type structure, and a rotating drum 11 is arranged inside the vacuum dehydration device 10. The rotating drum 11 includes a central hollow rotating shaft 19 and a plurality of support plates 18 radially arranged on the hollow rotating shaft 19. A water filter mesh 17 is covered on the outside of the plurality of support plates 18.

[0027] An inclined scraper 13 is provided on one side of the vacuum dehydration device 10 . The higher bottom end of the scraper 13 is arranged to fit the upper circular surface of the water filter screen 17 , and the lower end of the scraper 13 extends to above the input end of the sand conveying belt 16 .

[0028] In a preferred solution, the first slurry delivery pipe 3 is provided with a first slurry pump 4 , and the second slurry delivery pipe 8 is provided with a second slurry pump 9 .

[0029] In a preferred embodiment, the hydrocyclone 5 includes a plurality of hydrocyclones 5, and the plurality of hydrocyclones 5 are fixedly arranged on the same hydrocyclone bracket 6;

[0030] The first slurry delivery pipe 3 is connected to the input port of the hydrocyclone 5 at one end thereof, and the water outlet 502 at the top of the hydrocyclone 5 is connected to the input port of the next hydrocyclone 5 .

[0031] In a preferred solution, a slurry outlet 501 is provided at the bottom of the hydrocyclone 5 , and the lower end of the slurry outlet 501 is located in the slurry receiving tank 7 .

[0032] In a preferred solution, the inner bottom surface of the slurry receiving groove 7 is an inclined surface, which is arranged to be inclined downward along the mortar conveying direction.

[0033] In the preferred embodiment, a slurry retaining plate 12 is provided on the inner wall of the vacuum dehydration device 10 on the side of the rotating drum 11 close to the second slurry feeding pipe 8. The slurry retaining plate 12 has the same inclination direction as the scraper 13 and the scraper 13 is also arranged in contact with the upper circular surface of the water filter screen 17.

[0034] In a preferred solution, a water collecting box 15 is provided below the vacuum dehydration device 10 , and a water outlet pipe 14 is provided at the bottom of the vacuum dehydration device 10 , and the water outlet pipe 14 is located above the water collecting box 15 .

[0035] In a preferred embodiment, one end of the hollow shaft 19 passes through the side wall of the vacuum dehydration device 10 and extends to the outside of the vacuum dehydration device 10, and an air hole 191 is provided on the part of the hollow shaft 19 located in the vacuum dehydration device 10;

[0036] A negative pressure pipe 22 is movably connected to the end of the hollow rotating shaft 19 located outside the vacuum dehydration device 10 .

[0037] In a preferred solution, a pulley 20 is provided on the hollow shaft 19 outside the vacuum dehydration device 10 , and the driving device realizes the self-rotation drive of the drum 11 through a synchronous transmission belt 21 in cooperation with the pulley 20 .

[0038] In the above scheme:

[0039] The high-frequency dewatering screen 1 is driven by a vibration motor, the screen surface inclination is set to 10°, and the screen hole size is 0.2mm, which is suitable for removing large particle impurities with a particle size greater than 0.2mm in wastewater. The screen frame is made of corrosion-resistant stainless steel to extend its service life.

[0040] The slurry receiving box 2 is located at the discharge end of the high-frequency dewatering screen and is used to temporarily store the slurry with fine sand after screening. The first slurry delivery pipe 3 has a diameter of 100 mm and connects the slurry receiving box and the hydrocyclone to ensure the smooth flow of the slurry.

[0041] The first slurry pump 4 is a frequency conversion controlled centrifugal pump, which can adjust the pumping speed according to the actual needs of the hydrocyclone to maintain stable operation of the system.

[0042] The hydrocyclone 5 is made of polyurethane material and has good wear resistance. In this embodiment, three hydrocyclones are arranged in series, each with a diameter of 300 mm, and are fixedly installed by a hydrocyclone bracket 6 to work together to concentrate and separate fine sand.

[0043] The slurry outlet 501 at the bottom of each hydrocyclone 5 is directly connected to the slurry receiving tank 7, while the water outlet 502 at the top is connected to the next hydrocyclone in turn, and the final overflow water is collected in the water collecting tank 15 for recycling.

[0044] The slurry receiving trough 7 is designed as an inclined structure to facilitate the flow of slurry. The second slurry delivery pipe 8 has a diameter of 120 mm and is connected to the vacuum dehydration device 10 to ensure that the slurry smoothly enters the next dehydration procedure.

[0045] The second slurry pump 9 also adopts frequency conversion control, and adjusts the pumping volume according to the load of the vacuum dehydration device 10 to ensure the continuous and stable supply of fine sand.

[0046] The vacuum dehydration device 10 is a vertical box structure, with a rotating drum 11 inside. The rotating drum has a diameter of 1200 mm and a length of 3000 mm. It is composed of a hollow rotating shaft 19 and a plurality of supporting plates 18, and is covered with a water filtering gauze 17 with a mesh number of 200 to ensure the effective retention of fine sand and the rapid discharge of water.

[0047] The scraper 13 is arranged at the outlet end of the drum 11, and the angle is precisely adjusted to ensure that the fine sand is evenly scraped off the water filter screen 17 to avoid clogging. The slurry baffle 12 is located in front of the scraper to prevent the slurry from flowing back and ensure the dehydration effect.

[0048] The sand conveying belt 16 is used to receive the fine sand scraped off from the sand scraper 13 and convey it to a designated collection area to achieve continuous output of the fine sand.

[0049] The water collecting tank 15 is used to collect clean water discharged from the vacuum dehydration device 10 to facilitate the discharge and recycling of water.

[0050] The hollow shaft 19 is provided with a porous structure inside, which is connected to an external vacuum pump through a negative pressure pipe 22 to form a stable negative pressure environment to accelerate dehydration. The pulley 20 at the outer end of the hollow shaft 19 is connected to the driving device through a synchronous transmission belt 21 to ensure the smooth rotation of the drum.

[0051] Workflow:

[0052] The sand-containing wastewater first passes through the high-frequency dewatering screen 1 to remove large particle impurities, and then the slurry flows into the hydrocyclone 5 to concentrate the fine sand. The concentrated slurry is sent to the vacuum dehydration device 10 through the second slurry pump 9 for deep dehydration under the action of negative pressure. Finally, the dry fine sand is scraped off by the scraper 13 and sent to the sand conveying belt 16, and the clean water is collected in the water collecting tank 15 for recycling.

Claims

1. A fine sand recovery device, characterized in that: The invention comprises a high-frequency dewatering screen (1), wherein a pulp receiving box (2) is provided at the output end of the high-frequency dewatering screen (1), a first pulp feeding pipe (3) is provided on the pulp receiving box (2), the first pulp feeding pipe (3) is connected to a hydrocyclone (5), a pulp receiving groove (7) is provided at the bottom of the hydrocyclone (5), a second pulp feeding pipe (8) is provided at one end of the pulp receiving groove (7), and the second pulp feeding pipe (8) is connected to a vacuum dewatering device (10); The vacuum dehydration device (10) is a box-type structure, wherein a rotating drum (11) is provided inside the vacuum dehydration device (10), wherein the rotating drum (11) comprises a central hollow rotating shaft (19) and a plurality of support plates (18) radially arranged on the hollow rotating shaft (19), and a water filter mesh (17) is provided outside the plurality of support plates (18); An inclined sand scraper (13) is provided on one side of the vacuum dehydration device (10). The higher bottom end of the sand scraper (13) is arranged to fit the upper circular surface of the water filter screen (17), and the lower end of the sand scraper (13) extends to above the input end of the sand conveying belt (16).

2. A fine sand recovery device according to claim 1, characterized in that: The first slurry delivery pipe (3) is provided with a first slurry pump (4), and the second slurry delivery pipe (8) is provided with a second slurry pump (9).

3. A fine sand recovery device according to claim 1, characterized in that: The hydrocyclone (5) comprises a plurality of hydrocyclones, and the plurality of hydrocyclones (5) are fixedly arranged on the same hydrocyclone bracket (6); The first slurry delivery pipe (3) is connected to the input port of a hydrocyclone (5) at one end thereof, and the water outlet (502) at the top of the hydrocyclone (5) is connected to the input port of the next hydrocyclone (5).

4. A fine sand recovery device according to claim 3, characterized in that: The bottom of the hydrocyclone (5) is provided with a slurry outlet (501), and the lower end of the slurry outlet (501) is located in the slurry receiving groove (7).

5. A fine sand recovery device according to claim 4, characterized in that: The inner bottom surface of the slurry receiving groove (7) is an inclined surface, and is arranged to be inclined downward along the mortar conveying direction.

6. A fine sand recovery device according to claim 1, characterized in that: A slurry retaining plate (12) is provided on the inner wall of the vacuum dehydration device (10) on the side of the rotating drum (11) close to the second slurry feeding pipe (8). The slurry retaining plate (12) is inclined in the same direction as the sand scraper (13), and the sand scraper (13) is also arranged to fit the upper circular surface of the water filter screen (17).

7. The fine sand recovery device according to claim 1, characterized in that: A water collecting box (15) is provided below the vacuum dehydration device (10), and a water outlet pipe (14) is provided at the bottom of the vacuum dehydration device (10), wherein the water outlet pipe (14) is located above the water collecting box (15).

8. The fine sand recovery device according to claim 1, characterized in that: One end of the hollow rotating shaft (19) passes through the side wall of the vacuum dehydration device (10) and extends outside the vacuum dehydration device (10); an air hole (191) is provided on the portion of the hollow rotating shaft (19) located inside the vacuum dehydration device (10); A negative pressure tube (22) is movably connected to the end of the hollow rotating shaft (19) located outside the vacuum dehydration device (10).

9. A fine sand recovery device according to claim 8, characterized in that: A pulley (20) is provided on the portion of the hollow rotating shaft (19) located outside the vacuum dehydration device (10), and the driving device realizes the self-rotation drive of the rotating drum (11) through a synchronous transmission belt (21) in cooperation with the pulley (20).

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