Belt filter sand discharge structure

Abstract

This invention discloses a thickener sand discharge structure, comprising a flat-bottomed barrel and a compressed air pulping system located at the bottom of the barrel. The compressed air pulping system includes several concentric pulping ring pipes of different diameters, which are evenly arranged and surround to form a conical inclined surface. The cone angle of the conical surface is greater than the natural angle of repose of the tailings. A sand discharge port is provided at the cone angle, and a reverse cone is provided on the sand discharge port. By setting pulping ring pipes of different diameters inside the thickener to form a conical inclined surface structure, and by utilizing the slope formed by the natural sedimentation and compaction of tailings, or by first welding angle steel to form a conical skeleton and then utilizing the natural compaction of tailings, a conical structure with a cone angle greater than the natural angle of repose of the tailings is formed inside the thickener, achieving stable and smooth sand discharge from the thickened tailings. The thickener sand discharge structure of this invention adopts a non-powered sand discharge method, has low energy consumption, and can flexibly adjust the cone angle of the bottom cone, making it widely applicable for thickening tailings of different properties.

Description

Technical Field

[0001] This invention relates to the field of mine tailings backfilling technology, and in particular to a thickener sand discharge structure. Background Technology

[0002] A thickener is a solid-liquid separation device based on gravity settling. It is typically a shallow, cylindrical tank with a conical bottom, constructed from concrete, wood, or welded metal plates. It can concentrate slurry with a solids content of 10%–20% into underflow slurry with a solids content of 45%–55% through gravity settling. The thickener underflow is pumped back to the filtration system, while the overflow enters the tailings thickening system. Existing thickener equipment for tailings thickening mainly includes deep cone thickeners, vertical sand silos, and paste storage thickeners. Both vertical sand silos and deep cone thickeners use a conical bottom design to ensure smooth sand discharge. However, the conical bottom structure places high demands on the stability of the sand silo and thickener, resulting in high foundation investment. Furthermore, deep cone thickeners use a rake frame for agitation and sand discharge; the continuously operating rake frame structure relies on a high-power motor, leading to high energy consumption. Moreover, for coarse-grained tailings, thickeners with rake frame structures often experience rake crushing accidents, thus affecting normal production.

[0003] In the prior art, patent CN104524820 B discloses a deep cone thickener, including a tank, a large cone, a small cone, a rake frame, a feeding device, and a rake frame lifting drive device. The tank is a cylindrical structure with flanges at its upper and lower ends. The large diameter end of the large cone is connected upwards to the lower flange of the tank via the flange, and the small diameter end of the large cone is connected downwards to the large diameter end of the small cone. The small diameter end of the small cone has a discharge port and is equipped with a valve device. The upper flange of the tank is connected to the rake frame lifting drive device, and the main shaft of the reducer of the rake frame lifting drive device is connected to the central transmission shaft of the rake frame. The upper end of the feeding device is connected to the lifting plate of the rake frame lifting drive device via a screw. The deep cone thickener can achieve high-efficiency concentration, enhance the concentration of the thickener underflow discharge, and avoid clogging of the discharge port. However, it requires high structural stability and has a certain risk of rake damage.

[0004] In view of this, it is necessary to design a thickener sand discharge structure to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a thickener discharge structure with a flat bottom design, which combines the self-weight of tailings with a conical slurry ring pipe or the self-weight of tailings, a conical frame welded with angle steel and a conical slurry ring pipe, to achieve stable and smooth discharge of concentrated tailings, and has a stable structure with low civil engineering investment.

[0006] To achieve the above-mentioned objectives, the present invention provides a thickener sand discharge structure, including a flat-bottomed barrel and a compressed air slurry system disposed at the bottom of the barrel. The compressed air slurry system includes several concentrically arranged slurry ring pipes of different diameters. The slurry ring pipes are evenly arranged and surround to form a conical inclined surface. The cone angle of the cone is greater than the natural angle of repose of the tailings. A sand discharge port is provided at the cone angle of the cone, and a reverse cone is provided on the sand discharge port.

[0007] As a further improvement of the present invention, the bottom of the barrel is also provided with an annular frame for guiding the natural compaction of tailings.

[0008] As a further improvement of the present invention, the annular frame is disposed in the triangular area formed by the pulping annular pipe and the side wall of the barrel, and is welded by angle steel.

[0009] As a further improvement of the present invention, the pulping ring pipe is provided with a plurality of nozzles for expelling compressed gas.

[0010] As a further improvement of the present invention, the nozzle sprays in the direction of the inside of the cone.

[0011] As a further improvement of the present invention, the spacing between the nozzles on each ring of the pulping tube is 50-70 cm.

[0012] As a further improvement of the present invention, the pressure of the compressed gas is 0.5-0.8 MPa.

[0013] As a further improvement of the present invention, the spacing between the pulping ring pipes along the direction of the barrel is 0.8-1.2m.

[0014] As a further improvement of the present invention, the maximum diameter of the pulping ring pipe is smaller than the diameter of the barrel.

[0015] As a further improvement of the present invention, the tip of the reverse cone faces the sand discharge port.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention creates a conical inclined structure by setting up slurry ring pipes of different diameters inside the thickener, and by utilizing the slope angle formed by the natural sedimentation and compaction of tailings, or by first welding angle steel to form a conical skeleton and then utilizing the natural compaction of tailings, thereby forming a conical structure inside the thickener with a cone angle greater than the natural angle of repose of the tailings, thus achieving stable and smooth discharge of concentrated tailings.

[0018] 2. The slurry ring pipe of the present invention, arranged with a conical inclined surface, can, on the one hand, utilize the natural caking of tailings to form a conical structure at the bottom of the thickener; on the other hand, when tailings discharge is obstructed or when tailings are stored for a long time without being discharged for backfilling, it can activate and disturb the tailings within the conical area, preventing tailings caking. Simultaneously, the inverted cone design above the discharge port can prevent caking tailings from blocking the discharge port and increase the discharge range, further effectively preventing tailings from accumulating and caking inside the tank.

[0019] 3. The present invention utilizes the self-weight of tailings and a conical slurry ring pipe at the bottom of the thickener to coordinate sand discharge, thereby avoiding the risk of rake crushing caused by the rake frame in traditional thickeners. At the same time, tailings can also be buffered in large quantities inside the thickener barrel, so that the sand discharge structure of the thickener of the present invention can be used for paste filling in different mining methods.

[0020] 4. This invention, through its internal conical sand discharge structure and flat-bottom design of the thickener, achieves two main advantages: firstly, it enhances the overall stability of the thickener under stress, reducing the requirements for the civil engineering foundation; secondly, it significantly increases the effective volume of the thickener, fully meeting the tailings processing needs and thus effectively reducing civil engineering investment. The thickener's sand discharge structure employs a non-powered discharge method, resulting in low energy consumption, and allows for flexible adjustment of the cone angle at the bottom, making it widely applicable for thickening tailings of various properties (both coarse and fine). Attached Figure Description

[0021] Figure 1 This is a first structural schematic diagram of the thickener sand discharge structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the second structure of the thickener sand discharge structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the slurry ring pipe and ring frame of the present invention. Attached Figure Description

[0025] 10. Barrel body; 20. Compressed air pulping system; 21. Pulping ring pipe; 30. Ring frame; 40. Sand discharge port; 50. Reverse cone. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0028] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] like Figure 1 As shown, this invention provides a thickener sand discharge structure, including a flat-bottomed tank body 10 and a compressed air pulping system 20 disposed at the bottom of the tank body 10. The compressed air pulping system 20 includes several concentrically arranged pulping ring pipes 21 of different diameters. The pulping ring pipes 21 are evenly arranged and form a conical inclined surface around the tank body 10. The maximum diameter of the pulping ring pipes 21 is smaller than the diameter of the tank body 10, and the pulping ring pipes 21 are spaced 0.8-1.2m apart along the direction of the tank body 10. The cone angle of the cone is greater than the natural angle of repose of the tailings. A sand discharge port 40 is provided at the cone angle of the cone, and a reverse cone 50 with its tip facing the sand discharge port 40 is provided on the sand discharge port 40. By combining the pulping ring pipes 21 and the slope angle formed by the natural sedimentation and compaction of tailings, a conical structure with a cone angle greater than the natural angle of repose of the tailings is formed in the thickener, thereby achieving stable and smooth sand discharge of concentrated tailings.

[0030] Specifically, the slurry ring pipe 21 is also equipped with several nozzles for compressed gas ejection. The pressure of the compressed gas is 0.5-0.8 MPa, and the spacing between the nozzles on each ring of the slurry ring pipe 21 is 50-70 cm. The nozzles spray in the direction of the spray towards the inside of the cone. When the sand discharge is not smooth or the tailings are stored for a long time without being discharged for filling, the slurry system can be turned on to activate and disturb the tailings in the cone, preventing the tailings from caking.

[0031] Specifically, such as Figure 2-3 As shown, in some embodiments of the present invention, the bottom of the tank 10 is also provided with an annular frame 30 for guiding the natural compaction of tailings. The annular frame 30 is located in the triangular area formed by the pulping ring pipe 21 and the side wall of the tank 10, and is formed into a conical skeleton by welding angle steel. The conical skeleton guides the tailings to naturally compact, forming a conical bottom structure with a cone angle greater than the natural repose angle of the tailings. Combined with the pulping ring pipe 21, this achieves stable and smooth discharge of concentrated tailings.

[0032] In summary, the thickener sand discharge structure disclosed in this invention utilizes the self-weight of tailings and a conical slurry ring pipe 21, or the self-weight of tailings, a conical frame welded with angle steel, and a conical slurry ring pipe 21 for coordinated sand discharge. This avoids the risk of rake damage caused by the rake frame in traditional thickeners. Simultaneously, a large amount of tailings can be buffered within the thickener barrel 10, making the thickener sand discharge structure applicable to paste filling in different mining methods. Furthermore, by designing a conical sand discharge structure internally and a flat-bottomed thickener, the overall stress on the thickener is more stable, reducing the requirements for the civil engineering foundation. On the other hand, it significantly increases the effective volume of the thickener, fully meeting the tailings processing needs and effectively reducing civil engineering investment. The thickener sand discharge structure of this invention uses non-powered sand discharge, resulting in low energy consumption and flexible adjustment of the cone angle of the bottom cone. It can be widely used for thickening tailings of different properties (both coarse and fine tailings).

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A thickener sand discharge structure characterised in that: The device includes a flat-bottomed barrel and a compressed air slurry system located at the bottom of the barrel. The compressed air slurry system includes several concentric slurry ring pipes of different diameters. The slurry ring pipes are evenly arranged and surround to form a conical inclined surface. The cone angle of the cone is greater than the natural angle of repose of the tailings. A sand discharge port is provided at the cone angle of the cone, and an anti-cone is provided on the sand discharge port. The bottom of the barrel is also provided with an annular frame for guiding the natural compaction of tailings. The annular frame is located in the triangular area formed by the slurry ring pipe and the side wall of the barrel. The annular frame is welded by angle steel to form a conical skeleton. The conical skeleton guides the tailings to naturally compact, forming a conical bottom structure with a cone angle greater than the natural repose angle of the tailings. The pulping ring pipe is equipped with several nozzles for ejecting compressed gas, and the nozzles spray in the direction of the ejection direction towards the inside of the cone; the spacing between the nozzles on each ring of the pulping ring pipe is 50-70cm; the pressure of the compressed gas is 0.5-0.8MPa; The tip of the reverse cone faces the sand discharge port. By utilizing the slope angle formed by the slurry ring pipe and the natural sedimentation and agglomeration of tailings, a cone-shaped structure with a cone angle greater than the natural angle of repose of the tailings is formed in the thickener, thereby achieving stable and smooth discharge of concentrated tailings.

2. The thickener sand discharge structure defined in claim 1, characterized by: The spacing between the pulping ring pipes along the direction of the barrel is 0.8-1.2m.

3. The thickener sand discharge structure defined in claim 2 wherein: The maximum diameter of the pulping ring pipe is smaller than the diameter of the barrel.

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