High concentration steady-state sand-discharging paste bin stock thickener

Abstract

The application discloses a high-concentration steady-state sand-discharging paste bin storage thickener, which comprises a bin body and a slurry-making component arranged in the bin body and used for aerating and loosening the consolidated tailings in the bin body, wherein the bottom of the bin body is provided with a conical bin bottom, the conical bin bottom is arranged on a horizontal bin bottom of the paste bin storage thickener, the expanded end of the conical bin bottom is in sealing connection with the inner wall of the bin body, the contracted end of the conical bin bottom is in abutment on the horizontal bin bottom, the contracted end of the conical bin bottom is provided with a sand-discharging opening, and the sand-discharging opening of the conical bin bottom is in sealing connection with the sand-discharging opening of the horizontal bin bottom. The bottom of the bin body is provided with the conical bin bottom to improve the sedimentation efficiency of tailings particles; the conical bin bottom also simultaneously reduces the solid-liquid contact area of the bottom region of the bin body and the gap between the tailings particles, accelerates the solid-liquid separation speed, and improves the discharge concentration of the tailings; in addition, the horizontal bin bottom supports the conical bin bottom and provides stronger support force for the conical bin bottom, thereby guaranteeing the compression resistance of the conical bin bottom.

Description

Technical Field

[0001] This invention relates to the field of tailings thickener technology, and in particular to a paste storage thickener for high-concentration steady-state sand discharge. Background Technology

[0002] Backfilling mining plays a crucial role in underground mining, improving ore recovery rates, extending mine life, reducing surface subsidence and environmental impact, enhancing underground rock mass stability, and improving mine safety, thus aligning with the goals of sustainable development in the mining industry. Through layered mining and the use of supporting materials, backfilling mining achieves efficient resource utilization and protects both surface and underground environments, playing a vital role in modern mining. Tailings (or tailings, including graded tailings and whole tailings) are commonly used backfill aggregates in metal mines. The main backfilling process involves pumping tailings with lower concentrations from the concentrator to the sand bins or deep cone thickeners at the backfilling preparation station. After flocculation and concentration to a higher concentration, the slurry is discharged into a mixing system and mixed with cementing materials to form a suitable backfilling slurry. This slurry is then transported by gravity or pump to the desired backfilling location through boreholes and underground backfilling pipelines.

[0003] Traditional tailings thickening equipment includes deep cone thickeners, high-efficiency thickeners, and vertical sand bins. Through long-term practical application, we have found that these tailings thickening devices generally suffer from the following problems:

[0004] (1) To meet the tailings treatment capacity requirements, large-sized thickening equipment (generally with a diameter of 30m) is often used. Due to the large volume and heavy load of the thickener and sand bin, the requirements for the equipment foundation are high, and the investment in the civil engineering part of the thickener is often large, which greatly increases the investment in the construction of the filling system and the construction period of the filling station.

[0005] (2) To prevent tailings from caking inside the bin, traditional thickeners generally use an electrically driven rake-type disturbance structure for sand discharge. This consumes a large amount of energy (due to the continuous operation of a high-power rake) and has poor adaptability to materials. It is generally only suitable for fine-grained tailings, while coarse-grained tailings pose a risk of being crushed by the rake and cannot be reliably buffered, making it unsuitable for filling small stopes. In addition, because traditional thickeners use continuous sand feeding and discharge, they are greatly affected by fluctuations in the amount and concentration of sand coming from the beneficiation plant. This directly affects the amount and concentration of sand discharged from the bin, thus affecting the quality of the filling slurry, which is extremely detrimental to safe and civilized production underground.

[0006] (3) For mines that use vertical sand bin filling technology, in order to meet the requirements of continuous sand feeding in the beneficiation plant, multiple vertical sand bins often need to be built. This not only occupies a large area, but also the investment in the filling system is often higher. The equipment is scattered, which is not conducive to centralized management. During the filling operation, the degree of automation and intelligence is low, and the number of personnel required is large, which does not conform to the development trend of green mines of "automation to reduce manpower and intelligence to eliminate manpower".

[0007] Therefore, a paste storage thickener is developed, and a patent application file with the application number CN202010872701.X discloses a paste storage thickener. The paste storage thickener adopts an integrated double-cavity type bin body design, which can meet the continuous sand feeding demand of the plant, realize green production of the mine tailings, and make the structure more compact compared with the traditional vertical sand bin process, thereby facilitating automatic centralized management. In addition, the flat bottom type bin body structure is adopted, and an independent raft foundation can be used during installation, without the need for piling and other special foundation treatment methods, thereby greatly reducing the civil engineering investment and construction period. Meanwhile, the homogenization slurry making device is used to replace the traditional thickener bottom rake frame structure. The slurry making device is only used during sand feeding, and the energy consumption is extremely low. The occurrence of the rake pressing accident can be fundamentally avoided, and reliable storage with large capacity can be realized. In addition, centralized thickening and sand feeding can be realized, and the problem of sand feeding flow or concentration fluctuation caused by unstable sand feeding of the plant can be eliminated.

[0008] However, due to the flat bottom structure of the paste storage thickener, some problems exist in the field application, such as: (1) reduced tailings particle settling efficiency: the flat bottom structure limits the natural settling process of solid particles, resulting in slow settling speed. (2) uneven tailings particle accumulation: the flat bottom structure may cause uneven accumulation of tailings particles at the bottom, which may cause local slight hardening of the tailings, thereby reducing the stability of the equipment. (3) increased liquid residence time: the flat bottom structure causes the liquid to stay at the bottom for a long time, which slows down the solid-liquid separation process. Therefore, it is urgent to develop a paste storage thickener that can improve the tailings settling speed and solid-liquid separation speed while ensuring the pressure resistance of the conical bin bottom, and improve the discharge concentration of the tailings. SUMMARY

[0009] In order to overcome the shortcomings of the prior art, the present application provides a paste storage thickener with high concentration and stable sand feeding, which can improve the tailings settling speed and solid-liquid separation speed while ensuring the pressure resistance of the conical bin bottom, and improve the discharge concentration of the tailings.

[0010] The present application provides a paste storage thickener with high concentration and stable sand feeding, which comprises a bin body and a slurry making component arranged in the bin body for aerating and crushing the hardened tailings in the bin body. The bottom of the bin body is provided with a conical bin bottom, which is arranged on the horizontal bin bottom of the paste storage thickener. The outer expansion end of the conical bin bottom is sealingly connected with the inner wall of the bin body, the contraction end abuts against the horizontal bin bottom, and the contraction end of the conical bin bottom is provided with a sand discharge port. The sand discharge port of the conical bin bottom is sealingly connected with the sand discharge port of the horizontal bin bottom.

[0011] Preferably, an annular supporting cavity is formed between the conical bottom and the horizontal bottom, and a plurality of sand leakage windows are formed on the taper surface of the conical bottom, and the sand leakage windows are communicated between the inner cavity of the bin body and the annular supporting cavity.

[0012] Preferably, the number of sand leakage windows gradually decreases along the taper shrinkage direction of the conical bottom.

[0013] Preferably, the slurry making component is an aeration pipeline coiled on the conical bottom, and the air inlet end of the aeration pipeline is connected to the output end of the air compressor.

[0014] Preferably, the aeration pipeline is arranged on the conical bottom along the radial direction of the bin body.

[0015] Preferably, the aeration pipeline includes a plurality of aeration pipe rings with gradually increasing diameters, and the aeration pipe rings are coaxially arranged on the taper surface of the conical bottom along the diameter increasing direction of the bin body, so that the aeration system in the form of concentric rings is formed on the conical bottom.

[0016] Preferably, the number of aeration ports arranged on the aeration pipeline gradually increases along the distribution direction outwardly in the radial direction of the bin body.

[0017] Preferably, the aeration amount of the aeration pipeline gradually increases along the distribution direction outwardly in the radial direction of the bin body.

[0018] Preferably, the aeration ports are arranged towards the adjacent aeration pipeline in the radial direction of the bin body.

[0019] Preferably, the aeration ports are arranged towards the adjacent aeration pipeline outwardly in the radial direction of the bin body.

[0020] The beneficial effects of the present application are:

[0021] The high-concentration steady-state sand discharging paste bin storage thickener provided by the present application sets the bottom of the bin body as a conical bottom, and sets the sand discharging port of the bin body at the shrinkage end of the conical bottom, so that the tail sand in the bin body can quickly slide into the sand discharging port under the guidance of the taper surface of the conical bottom, thereby improving the sedimentation efficiency of the tail sand particles; the gradually shrinking shape of the conical bottom reduces the solid-liquid contact area of the bottom region of the bin body, thereby accelerating the solid-liquid separation speed; and under the guidance of the taper surface of the conical bottom, the tail sand particles gather towards the shrinkage end of the conical bottom, so that the tail sand particles are tightly packed at the bottom, the gap between the tail sand particles is reduced, a more dense solid layer is formed at the bottom of the bin body, and the discharge concentration of the tail sand is improved. At the same time, in order to avoid the accumulation of a large amount of tail sand in the conical bottom and form a large pressure on the conical bottom, the conical bottom is arranged on the horizontal bottom, the horizontal bottom supports the conical bottom, provides stronger support force for the conical bottom, and ensures the pressure resistance of the conical bottom.

[0022] The annular support cavity is formed between the conical bottom and the horizontal bottom of the high-concentration steady-state sand discharging paste bin thickener, a plurality of sand discharging windows are arranged on the conical surface of the conical bottom, and the sand discharging windows are communicated with the inner cavity of the bin body and the annular support cavity.

[0023] The aeration port is arranged adjacent to the aeration pipeline in the radial direction of the bin body, so that the bubbles overflowing from the aeration port can not only be disturbed upward under the action of the buoyancy to disturb and break the hardened tailings thereon, but also can disturb and break the tailings on the side of the adjacent pipeline, thereby avoiding the problem of tailings accumulation on the side wall of the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The structure diagram of the high-concentration steady-state sand discharging paste bin thickener is shown.

[0025] Figure 2 The top view of the conical bottom of the high-concentration steady-state sand discharging paste bin thickener is shown.

[0026] The labels of the components in the drawings are as follows:

[0027] 1, bin body; 11, conical bottom; 12, horizontal bottom; 101, annular support cavity; 111, sand discharging window; 3, aeration pipeline; 4, air compressor; 31, aeration pipe ring; 102, sand discharging port; 301, aeration port. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly defined.

[0029] The present application provides a high-concentration steady-state sand discharging paste bin thickener, as shown in Figure 1 and Figure 2 The present application provides a high-concentration steady-state sand discharging paste bin thickener, as shown in

[0030] To improve the settling efficiency of tailings particles, the bottom of the bin body 1 is provided with a conical bin bottom 11, and the sand discharge port 102 of the bin body 1 is arranged at the contraction end of the conical bin bottom 11. The tailings in the bin body 1 can quickly slide into the sand discharge port 102 under the guidance of the conical surface of the conical bin bottom. The gradually contracting shape of the conical bottom reduces the solid-liquid contact area of the bottom region of the bin body 1, speeds up the solid-liquid separation speed, and under the guidance of the conical surface of the conical bin bottom, the tailings in the bin body 1 gather towards the contraction end, so that the tailings particles are tightly packed at the bottom, reducing the voids between the tailings particles, forming a denser solid layer at the bottom of the bin body 1, and improving the discharge concentration of the tailings. At the same time, in order to avoid the accumulation of a large amount of tailings in the conical bin bottom 11, a large pressure is formed on the conical bin bottom 11, and the conical bin bottom 11 is arranged on the horizontal bin bottom 12 to support the conical bin bottom 11 and provide stronger support for the conical bin bottom 11, ensuring the pressure resistance of the conical bin bottom 11.

[0031] As shown in Figure 1 , an annular support cavity 101 is formed between the conical bin bottom 11 and the horizontal bin bottom 12, and a plurality of sand leakage windows 111 are formed on the conical surface of the conical bin bottom 11, which communicate the inner cavity of the bin body 1 with the annular support cavity 101. The tailings fall into the annular support cavity 101 through the sand leakage windows 111, and when the annular support cavity 101 is filled with tailings, the tailings in the annular support cavity 101 provide support for the conical wall of the conical bin bottom 11 to improve the pressure resistance of the conical bin bottom 11. Preferably, the number of sand leakage windows 111 gradually decreases along the contraction direction of the conical bin bottom 11.

[0032] The pulp forming component is an aeration pipe 3 coiled at the bottom of the bin body 1, and the air inlet end of the aeration pipe 3 is connected to the output end of the air compressor 4. Specifically, the aeration pipe 3 is arranged in the conical bin bottom 11 along the radial direction of the bin body 1, as shown in Figure 2 , the aeration pipe 3 includes a plurality of aeration pipe rings 31 with gradually increasing diameters, which are coaxially arranged on the conical surface of the conical bin bottom 11 in the diameter increasing direction of the bin body 1, forming a concentric ring arrangement of the aeration system on the conical bin bottom 11. When the tailings are hardened on the conical bin bottom 11, the air compressor is started to aerate the bin body 1 through the aeration pipe 3. The bubbles generated by aeration break through the tailings above and surge upwards, breaking the blocky tailings.

[0033] The aeration pipe 3 aerates the bin body 1, disturbs the bottom of the bin body 1, breaks the tailings deposited on the bottom of the bin body 1 and hardened into blocks, realizes the orderly discharge of the tailings in the bin body 1 of the paste bin storage thickener, keeps the inside of the bin body 1 of the paste bin storage thickener in a state of pressure balance at all times, avoids the situation that the tailings cannot be discharged due to hardening and causes uneven distribution of pressure in the bin of the thickener, damages the equipment and shortens the service life of the thickener.

[0034] The sand discharge opening 102 of the bin body 1 is arranged at the center of the conical bin bottom 11. The flocculated tailings in the bin body 1 are discharged from the sand discharge opening 102. As the tailings are discharged, a negative pressure pattern is formed around the sand discharge opening 102. The closer to the sand discharge opening 102, the greater the pressure of the negative pressure. The farther away from the sand discharge opening 102, the smaller the pressure of the negative pressure. Therefore, the tailings farther away from the sand discharge opening 102 need a larger disturbance force to push them to the sand discharge opening 102. As shown in Figure 1 and Figure 2 As shown, the number of aeration openings 301 arranged on the aeration pipe 3 gradually increases along the distribution direction of the bin body 1 radially outward. By increasing the number of aeration openings 301, the disturbance effect of the aeration pipe 3 on the tailings far away from the sand discharge opening 102 is improved, so as to push the tailings far away from the sand discharge opening 102 to the sand discharge opening 102, thereby avoiding the deposition of tailings on the bin bottom. Further preferably, the aeration amount of the aeration pipe 3 can also be gradually increased along the distribution direction of the bin body 1 radially outward. By increasing the aeration amount, the disturbance effect of the aeration pipe 3 on the tailings far away from the sand discharge opening 102 is also improved, so as to push the tailings far away from the sand discharge opening 102 to the sand discharge opening 102.

[0035] Since the pipe body of the aeration pipe 3 is arranged at the bottom of the bin body 1, if the aeration openings 301 of the aeration pipe 3 are arranged vertically upward, part of the tailings may accumulate on both sides of the pipe body, or the consolidated tailings on both sides of the aeration pipe 3 may not be completely broken. To avoid the above problems, as shown in Figure 1 and Figure 2 The aeration openings 301 are arranged towards the adjacent aeration pipe 3 in the radial direction of the bin body 1. The bubbles emitted from the aeration openings 301 not only disturb and break the consolidated tailings above them under the action of buoyancy, but also disturb and break the tailings on the side of the adjacent pipe, thereby avoiding the accumulation of tailings on the side wall of the pipe. According to the position of the aeration pipe 3, the tailings are prone to deposit on the side of the aeration pipe 3 radially outward. Therefore, specifically, the aeration openings 301 are arranged towards the adjacent aeration pipe 3 radially outward of the bin body 1. The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow conversion using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A high concentration steady-state sand-batching paste bin stock thickener characterized by, The invention relates to a slurry making device, which comprises a bin body and a slurry making component arranged in the bin body for aerating and loosening the compacted sand in the bin body, wherein the bottom of the bin body is provided with a conical bin bottom, the conical bin bottom is arranged on the horizontal bin bottom of the paste bin storage thickener, the expanded end of the conical bin bottom is sealingly connected with the inner wall of the bin body, the contracted end of the conical bin bottom abuts against the horizontal bin bottom, and the contracted end of the conical bin bottom is provided with a sand discharge opening, the sand discharge opening of the conical bin bottom is sealingly connected with the sand discharge opening of the horizontal bin bottom. An annular supporting cavity is formed between the conical bin bottom and the horizontal bin bottom, a plurality of sand leakage windows are arranged on the conical surface of the conical bin bottom, the sand leakage windows are in communication with the inner cavity of the bin body and the annular supporting cavity, and the number of the sand leakage windows gradually decreases along the contraction direction of the conical surface of the conical bin bottom. The slurry making component is an aeration pipeline arranged in the conical bin bottom in a coil shape, the air inlet end of the aeration pipeline is connected with the output end of an air compressor, and the aeration pipeline is arranged on the conical bin bottom in a radial direction of the bin body. The aeration pipeline comprises a plurality of aeration pipe rings with gradually increasing diameters, the aeration pipe rings are coaxially arranged on the conical surface of the conical bin bottom along the direction in which the diameter of the bin body increases, and the aeration pipeline forms a concentric ring arrangement of aeration systems on the conical bin bottom. Along the distribution direction of the bin body in the radial direction outward, the number of the aeration ports arranged on the aeration pipeline gradually increases, and the aeration ports are arranged towards the adjacent aeration pipeline on the side of the bin body in the radial direction outward. The feature of the invention is that along the distribution direction of the bin body in the radial direction outward, the aeration amount of the aeration pipeline gradually increases.

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