A settling basin overflow

Abstract

The utility model belongs to the technical field of sedimentation tank, concretely is a kind of sedimentation tank overflow port, including the well type overflow cylinder body of bottom end intercommunication drainage channel, and it includes: the well type overflow cylinder body top inlet is flared mouth shape and in the peripheral floating of inlet, annular floating plate connected with the annular floating plate that prevents surface water directly into inlet is equipped with.The annular floating plate is equipped with the cylindrical structure that extends below waterline, the gap between the cylindrical structure and well type overflow cylinder body forms the passage that sedimentation tank water flow enters inlet, the edge of inlet is broken line top edge, annular floating plate can adaptively slurry density change, always float in surface layer, effectively block the lightweight impurities with density less than quartz sand.Horn mouth design reduces the water inflow velocity to 0.1-0.3m / s, avoid disturbing already settled quartz sand layer.The structure is especially suitable for quartz sand washing process, can reduce the loss of useful quartz sand about 15%, improve raw material recovery rate.

Description

Technical Field

[0001] This utility model relates to the field of sedimentation tank technology, specifically to a sedimentation tank overflow outlet. Background Technology

[0002] In the glass manufacturing industry, the pretreatment of quartz sand raw materials is crucial, and settling tanks are key equipment used to separate impurities and fine particles from quartz sand raw materials. Quartz sand settling tanks face unique challenges: they need to handle high-concentration, highly abrasive slurries, separate mineral particles of similar density, and prevent the loss of fine quartz sand particles. Traditional overflow structures have significant shortcomings in handling quartz sand slurries.

[0003] The "Mineral Processing Design Manual" (Metallurgical Industry Press, 2011) describes a "fixed overflow weir structure," which achieves overflow separation through a weir of fixed height. However, when processing quartz sand slurry, the fixed weir is easily clogged by coarse quartz sand particles and cannot effectively separate lightweight impurities of similar density (such as mica and feldspar). More seriously, the fixed weir generates eddies when the flow rate changes, causing the settled fine quartz sand particles to resuspend and flow away, resulting in raw material loss.

[0004] The book *Mineral Processing Engineering Design* (China University of Mining and Technology Press, 2015) introduces an "overflow device with buffer baffles," attempting to improve the flow pattern by adding baffles. However, the rigid baffles in this design quickly fail under the high abrasion environment of quartz sand and cannot adapt to the slurry density fluctuations caused by changes in quartz sand concentration. Particles easily accumulate around the baffles, forming short-circuit flow and reducing separation efficiency.

[0005] In response to the specific needs of quartz sand raw material processing, there is an urgent need to develop a special overflow outlet structure that can adapt to concentration changes, resist wear, effectively separate light impurities, and prevent the loss of fine particles. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a sedimentation tank overflow outlet, including a well-type overflow cylinder with a drainage channel at the bottom, comprising: a funnel-shaped inlet at the top of the well-type overflow cylinder, and an annular float plate floating around the inlet to prevent surface water from directly entering the inlet.

[0007] The annular float plate has a cylindrical structure extending below the waterline, and the gap between the cylindrical structure and the well-type overflow cylinder forms a channel for the sedimentation tank water to enter the inlet.

[0008] The top surface of the annular float is provided with an annular groove, and a counterweight block embedded in the annular groove is detachably connected to the annular groove.

[0009] The top of the well-type overflow cylinder is provided with several through holes in a uniform array around the circumference. The side wall of the annular float plate is provided with float plate holes corresponding to the number and angle of the through holes. Each float plate hole and through hole is connected to a flexible connecting rope. The two ends of the flexible connecting rope pass through the float plate hole and the through hole respectively, and the end face is provided with protrusions to prevent the flexible connecting rope from detaching from the float plate hole and the through hole.

[0010] The inner wall of the inlet is provided with several spiral protrusions for guiding the water flow.

[0011] The inner wall of the well-type overflow cylinder is provided with spiral blades, and the spiral blades and the well-type overflow cylinder form a spiral pipe. The spiral blades and the spiral protrusions rotate in the same direction.

[0012] The spiral blade has a central pipe extending through both ends, and each layer of the spiral blade has air holes for balancing air pressure.

[0013] The annular float plate has a concave, downward-cut conical surface at its edge to prevent water wave impact.

[0014] Compared with the prior art, this utility model provides an overflow outlet for a sedimentation tank, which has the following beneficial effects: 1. The primary benefit of the sedimentation tank overflow design lies in creating a stable and optimized flow field environment, significantly reducing the loss of granular quartz sand and directly improving the raw material recovery rate. Through the synergistic effect of the spiral guide and flow stabilizing structure, the overflow outlet forms a controlled and stable swirling flow field at the inlet and inside, rather than turbulent flow. This not only avoids the scouring of the settled fine sand layer by local high-speed water flow, but also enhances the classification effect. Ultimately, this approach minimizes the loss of high-value fine quartz sand due to resuspension with the overflow water, stabilizing the raw material recovery rate at an extremely high level and bringing significant economic benefits. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model.

[0016] In the diagram: 1. Well-type overflow cylinder; 2. Broken-line top edge; 3. Annular float; 4. Counterweight block; 5. Through hole; 6. Float hole; 7. Flexible connecting rope; 8. Central pipe; 9. Spiral protrusion; 10. Air hole; 11. Spiral blade; 12. Downcut cone surface. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example The following is combined Figure 1 and Figure 2 This application introduces an overflow outlet for a settling tank, comprising a well-type overflow cylinder 1 with a drainage channel at its bottom. The overflow cylinder 1 has a funnel-shaped inlet at its top, and an annular float 3 is floatingly fitted around the inlet to prevent surface water from directly entering. Addressing the issue of lightweight impurities (such as mica and organic matter) in quartz sand slurry easily being lost through surface overflow, this design uses the floating annular float 3 to form a dynamic isolation layer. Since the density of quartz sand slurry fluctuates greatly (1.2-1.8 g / cm³), the annular float 3 can adapt to changes in slurry density, always floating on the surface, effectively blocking lightweight impurities with a density less than quartz sand. The funnel-shaped design reduces the inlet flow velocity to 0.1-0.3 m / s, avoiding disturbance to the settled quartz sand layer. This structure is particularly suitable for quartz sand washing processes, reducing the loss of useful quartz sand by approximately 15% and improving raw material recovery.

[0019] The annular float 3 has a cylindrical structure extending below the waterline. The gap between the cylindrical structure and the well-type overflow cylinder 1 forms a channel for the sedimentation tank water to enter the inlet. In some embodiments, the edge of the inlet can be set as a zigzag top edge 2. By extending the cylindrical structure and designing the zigzag top edge 2, "submerged overflow" of the quartz sand slurry is achieved. The zigzag top edge 2 evenly distributes the overflow load, preventing localized high-speed flows from stirring up fine sand at the bottom. The cylindrical structure forms an immersion depth of 400-600 mm, ensuring that the overflow is taken from the clear water layer rather than the surface layer, effectively separating fine quartz sand particles smaller than 0.075 mm. This design reduces the overflow solids content to below 50 mg / L, significantly improving the utilization rate of the quartz sand raw material. Of course, the edge of the inlet can also use a traditional smooth edge.

[0020] The top surface of the annular float 3 is provided with an annular groove, and a counterweight 4 is detachably connected to the annular groove. The adjustable counterweight 4 is specifically designed to address the variable concentration of quartz sand slurry. When processing low-concentration quartz sand slurry, adding the counterweight 4 improves stability and maintains optimal buoyancy. The counterweight 4 is made of wear-resistant ceramic material. By adjusting the counterweight, it can adapt to a slurry density range of 1.1-1.9 g / cm³, ensuring effective separation of light impurities under various working conditions.

[0021] The top of the well-type overflow cylinder 1 has several through holes 5 arranged in a uniform array around its circumference. The sidewall of the annular float 3 has float holes 6 corresponding to the number and angle of the through holes 5. Each float hole 6 and through hole 5 is connected to a flexible connecting rope 7. The two ends of the flexible connecting rope 7 pass through the float hole 6 and through hole 5 respectively, and each end face has protrusions to prevent the flexible connecting rope 7 from detaching from the float hole 6 and through hole 5. This flexible connection system solves the common problem of particle jamming in quartz sand settling tanks. Ultra-high molecular weight polyethylene (UHMWPE) material is preferably used for the connecting rope, which has eight times the wear resistance of steel and a smooth surface that does not adhere to particles. The flexible design allows the float to automatically rise and avoid quartz sand accumulation, preventing jamming. The six-point evenly distributed connection ensures a uniform and consistent inlet channel, preventing excessive local flow velocity that could entangle fine sand.

[0022] The inner wall of the inlet is provided with several spiral protrusions 9 to guide the water flow. These spiral protrusions 9 are optimized for the characteristics of quartz sand particles. The height of the protrusions is preferably 1 / 12 of the cylinder diameter, best promoting the sedimentation of 0.1-0.5mm quartz sand particles. The rotating water flow generates a moderate centrifugal force, causing denser quartz sand particles to move towards the cylinder wall and settle, while less dense impurities accumulate towards the center and overflow. This structure improves classification efficiency and reduces the content of +0.075mm quartz sand in the overflow product.

[0023] The inner wall of the well-type overflow cylinder 1 is provided with spiral blades 11, which, together with the well-type overflow cylinder 1, form a spiral pipe. The spiral blades 11 and the spiral protrusions 9 rotate in the same direction. The spiral blades 11 and the spiral protrusions 9 constitute a composite vortex system, which significantly extends the settling path of quartz sand particles. Different pitches of the spiral blades 11 can provide the optimal settling environment for quartz sand of different particle sizes. The stable vortex generated by the system avoids short-circuiting, improves volume utilization, and is particularly suitable for the precise classification of quartz sand.

[0024] The spiral blade 11 has a central pipe 8 extending through both ends. Each layer of the spiral blade 11 has vents 10 for balancing air pressure within the central pipe 8. The central pipe 8 and vents 10 address the issue of air generation in high-concentration quartz sand slurry. The distributed vents 10 promptly expel air entrained in the slurry, preventing air resistance from affecting overflow stability. The central pipe 8 also serves as a sampling channel, allowing real-time monitoring of the slurry concentration at various depths. This design ensures stable operation even in quartz sand slurry with a solids content as high as 40%.

[0025] The annular float 3 has a concave, downward-cut conical surface 12 at its edge to prevent impact from surface waves. This concave, downward-cut conical surface 12 is optimized for the turbulent characteristics of the quartz sand settling tank. The conical surface has a 45° inclination angle, effectively guiding the slurry and preventing accumulation. The downward-cut structure reduces surface turbulence energy by more than 70%, preventing fine quartz sand particles from being disturbed and suspended. The conical surface is coated with a silicon carbide wear-resistant coating, extending its service life.

[0026] Implementation method 1: An overflow outlet for coarse separation of quartz sand is disclosed. The well-type overflow cylinder 1 is made of 316L stainless steel, with a diameter of 800mm, a wall thickness of 12mm, and a height of 2500mm. The bell-shaped inlet has an expansion angle of 50°, and the top edge 2 of the zigzag design has a tooth depth of 30mm and a tooth pitch of 80mm. The annular float 3 is made of ultra-high molecular weight polyethylene, with an inner diameter of 1000mm, an outer diameter of 1400mm, and a lower cylindrical structure height of 300mm. The counterweight 4 is made of silicon carbide ceramic, with a single weight of 15kg, and a total of 6 counterweights are provided. The cylinder has 6 φ18mm through holes 5, and the float has corresponding 6 φ22mm float holes 6. The connecting rope is made of 16mm diameter ultra-high molecular weight polyethylene rope. This embodiment is applied to a quartz sand washing and separation system with a processing capacity of 50t / h, and the overflow solid content is stably maintained below 30mg / L, with the quartz sand recovery rate increased to 98.5%.

[0027] Implementation Method 2: An overflow outlet for precise quartz sand classification enhances the cyclone separation function based on Embodiment 1. The inner wall of the well-type overflow cylinder 1 has four spiral protrusions 9, each 65mm high and with a pitch of 1200mm. Three layers of spiral blades 11 are installed internally, with a blade spacing of 350mm and the spiral direction matching the protrusions. A central pipe 8 with a diameter of 200mm is fixed at the center of each spiral blade 11, and eight φ12mm air holes 10 are opened in each layer. The edge of the annular float 3 is machined with a concave downward-cut conical surface 12, with a conical inclination angle of 45° and a depth of 100mm, and the surface is sprayed with a tungsten carbide wear-resistant coating. This embodiment is used in the fine quartz sand classification process, processing slurries with a concentration of 25%, achieving precise classification with d97=0.063mm, a classification efficiency of over 85%, and a trouble-free operating time of over 8000 hours.

[0028] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A settling basin overflow comprising a well-type overflow cylinder (1) having a bottom end communicating with a drain channel, characterized in that, include: The top inlet of the well-type overflow cylinder (1) is shaped like a trumpet and is fitted with an annular float plate (3) to prevent surface water from directly entering the inlet.

2. A settling basin overflow according to claim 1, characterised in that: The annular float (3) is provided with a cylindrical structure extending below the waterline, and the gap between the cylindrical structure and the well overflow cylinder (1) forms a channel for the sedimentation tank water to enter the inlet.

3. A sedimentation basin overflow according to claim 2, wherein: The top surface of the annular float (3) is provided with an annular groove, and a counterweight (4) is detachably connected to the annular groove.

4. A settling basin overflow according to claim 1, wherein: The top of the well-type overflow cylinder (1) is provided with several through holes (5) in a uniform array around the circumference. The side wall of the annular float plate (3) is provided with float plate holes (6) corresponding to the number and angle of the through holes (5). Each float plate hole (6) and through hole (5) is connected to a flexible connecting rope (7). The two ends of the flexible connecting rope (7) pass through the float plate hole (6) and through hole (5) respectively, and the end face is provided with protrusions to prevent the flexible connecting rope (7) from detaching from the float plate hole (6) and through hole (5).

5. A settling basin overflow according to claim 1, wherein: The inner wall of the inlet is provided with a number of spiral protrusions (9) for guiding the water flow.

6. A lagoon overflow according to claim 5 wherein: The inner wall of the well-type overflow cylinder (1) is provided with a spiral blade (11), and the spiral blade (11) and the well-type overflow cylinder (1) form a spiral pipe. The spiral blade (11) and the spiral protrusion (9) have the same direction of rotation.

7. A lagoon overflow according to claim 6 wherein: The spiral blade (11) has a central pipe (8) with both ends passing through it. The central pipe (8) has air holes (10) in each layer of spiral blade (11) for balancing air pressure.

8. A settling basin overflow according to claim 1, wherein: The annular float (3) has a concave undercut cone surface at its edge to prevent water wave impact.

Images