A low-concentration ultra-fine tailings dense filling device and its concentration method

Abstract

The present invention relates to a low-concentration ultrafine full tailings dense filling device and a concentration method thereof, belonging to the technical field of metal mine filling equipment in the metallurgical industry. The technical solution is as follows: the lower part of the tank body (1) is provided with an upper branch pipe (16) and a bottom branch pipe (18) fixedly connected to a rotating shaft (15); the upper part of the tank body (1) is provided with an isolation cylinder (7), a sand separation ring groove (4) and an umbrella body (11); the sand separation ring groove (4) is fixed to the lower end of the isolation cylinder (7); the lower end of the umbrella body (11) is fixed to the inner wall of the tank body (1); the upper end of the umbrella body (11) is supported on the sand separation ring groove (4); the sand inlet pipe (2) is connected to the sand separation ring groove (4) through a pipeline mixer (3); the top of the tank body (1) is provided with an overflow ring groove (9), and the bottom of the tank body (1) is provided with a sand discharge pipe (20). The beneficial effect of the present invention is that it can achieve the short-process high-efficiency concentration of full tailings and the overflow water clarification and discharge requirements.

Description

Technical Field

[0001] The invention relates to a low-concentration ultra-fine full tailings dense filling device and a concentration method thereof, belonging to the technical field of metal mine filling equipment in the metallurgical industry. Background Art

[0002] Underground metal mining typically utilizes a full tailings cementation backfill mining method. The concentration and storage of beneficiation tailings utilizes a two-stage process: a large-diameter thickener and a deep-cone thickener / vertical silo. Low-concentration tailings, less than 9%, initially enter the large-diameter thickener, where they are concentrated to 40%-50% through dynamic sedimentation. If the primary concentration decreases, the large-diameter thickener efficiency decreases; if the primary concentration increases, the large-diameter thickener is prone to rake-pressing accidents. Slurry pumps located at the bottom of the large-diameter thickener transport the 40%-50% concentrated tailings to the deep-cone thickener / vertical silo for secondary concentration. Due to the high concentration of 40%-50% beneficiation tailings, especially when the tailings particle size exceeds 75% of -200 mesh, solid-liquid separation is difficult, resulting in high turbidity in the overflow water and large fluctuations in the concentration of the secondary concentrated tailings. Conventional measures include optimizing the structural parameters of the two-stage process and uniformly adding water to the deep-cone thickener / vertical sand silo feed barrel to dilute the tailings concentration. While this solves the problem of substandard overflow water turbidity, it also comes with drawbacks such as high process investment, a long infrastructure period, and high ongoing operating costs. Furthermore, with these two-stage processes, the concentration of the secondary concentrated tailings remains uncontrollable. This patented invention provides a low-concentration, ultra-fine, full-tailings thickening and filling device to address these issues. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-concentration ultra-fine full tailings dense filling device and a concentration method thereof, which can achieve short-process and efficient concentration of full tailings and solve the problems existing in the background technology.

[0004] The technical solution of the present invention is:

[0005] A low-concentration ultra-fine tailings dense filling device comprises a tank body, a sand inlet pipe, a pipeline mixer, a sand separation ring groove, an isolation cylinder, an umbrella body, a drive unit, a clean water pipe, a rotating shaft, an upper branch pipe, a bottom branch pipe, a nozzle and a sand discharge pipe. The rotating shaft is tubular and vertically arranged at the center of the tank body. The upper end of the rotating shaft is provided with a drive unit and is connected to the clean water pipe.

[0006] The lower part of the tank body is provided with an upper branch pipe and a bottom branch pipe fixedly connected to the rotating shaft, and the upper branch pipe and the bottom branch pipe are respectively provided with vertically arranged nozzles;

[0007] The upper part of the tank body is provided with an isolation cylinder, a sand dividing ring groove and an umbrella body. The top of the isolation cylinder is a closed structure. The sand dividing ring groove is fixed to the lower end of the isolation cylinder. The umbrella body is a conical cylinder with a small upper part and a large lower part. The lower end of the umbrella body is fixed to the inner wall of the tank body, and the upper end of the umbrella body is supported on the sand dividing ring groove. The sand inlet pipe is connected to the sand dividing ring groove through a pipeline mixer. The sand dividing ring groove and the umbrella body are respectively provided with through holes.

[0008] An overflow ring groove is provided on the top of the tank body, a water outlet pipe is provided in the overflow ring groove, and a sand discharge pipe is provided at the bottom of the tank body.

[0009] The isolation cylinder, sand separation ring groove and umbrella body are connected into a whole, dividing the interior of the tank into two spaces, the upper space is a clarification and separation zone; the rotating surface formed by the upper branch pipe rotating with the rotating shaft divides the lower space into two parts, the area above the rotating surface is the preliminary flocculation and sedimentation area, the area below the rotating surface is the sedimentation and compression area, and the interior of the isolation cylinder is the secondary stirring and flocculation area.

[0010] The isolation cylinder is provided with a water outlet window which is connected with the clarification and separation zone.

[0011] The upper part of the tank body is cylindrical, and the lower part is conical.

[0012] The inclination angle of the bottom of the tank is 10 to 25 degrees

[0013] The bottom branch pipe is arranged parallel to the bottom of the tank body.

[0014] A stirrer is fixed on the rotating shaft and is located at the bottom of the isolation cylinder.

[0015] The sand dividing annular groove is connected with the air vent pipe.

[0016] The upper branch pipe and the bottom branch pipe are connected by a plurality of vertical rods.

[0017] A low-concentration ultra-fine tailings concentration method uses the low-concentration ultra-fine tailings thickening filling device defined above and is operated according to the following steps:

[0018] ① The low-concentration ultra-fine tailings slurry with added chemicals is first preliminarily coagulated in the pipeline mixer, then enters the sand separation ring groove through the sand inlet pipe, and enters the preliminary flocculation and sedimentation area through the through holes on the sand separation ring groove;

[0019] ② In the primary flocculation and sedimentation area, low-concentration ultrafine tailings slurry enters the sedimentation and compression area under gravity conditions, while high-concentration slurry enters the sedimentation and compression area; the low-concentration slurry enters the secondary stirring and flocculation area under the stirring and lifting action of the agitator, forming larger flocs, and then enters the clarification and separation area through the water outlet window for secondary solid-liquid separation; the clarified water is discharged through the overflow ring groove and the water outlet pipe; the settled ultrafine tailings mud returns to the primary flocculation and sedimentation area through the through-holes on the umbrella body and re-participates in the flocculation and sedimentation operation;

[0020] ③ In the settlement and compression zone, the high-concentration mortar always maintains an activated paste state under the rotating shearing action of the upper and bottom branches, and performs high-pressure water slurrying operations through nozzles to adjust the concentration of the ultra-fine tailings mortar in the settlement and compression zone to meet the filling sand concentration requirements.

[0021] The present invention has the following advantages: a short-process tailings thickening process, the use of branch pipes and nozzles at the bottom instead of a rake frame structure, eliminating the risk of rake pressure, allowing for manual adjustment of the filling sand concentration, and enabling overflow water to be easily discharged in compliance with standards. The device has the advantages of a simple structure, easy installation, and low investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] In the figure: tank body 1, sand inlet pipe 2, pipeline mixer 3, sand dividing ring groove 4, air permeable pipe 5, stirrer 6, isolation cylinder 7, water outlet window 8, overflow ring groove 9, water outlet pipe 10, umbrella body 11, drive unit 12, clean water pipe 13, collar 14, rotating shaft 15, upper branch pipe 16, vertical rod 17, bottom branch pipe 18, nozzle 19, sand discharge pipe 20, through hole 21. Implementation Method

[0024] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0025] Refer to the attached Figure 1 A low-concentration ultra-fine tailings dense filling device includes a tank body 1, a sand inlet pipe 2, a pipeline mixer 3, a sand separation ring groove 4, an isolation cylinder 7, an umbrella body 11, a drive unit 12, a clean water pipe 13, a rotating shaft 15, an upper branch pipe 16, a bottom branch pipe 18, a nozzle 19 and a sand discharge pipe 20. The rotating shaft 15 is tubular and vertically arranged at the center of the tank body 1. The upper end of the rotating shaft 15 is provided with a drive unit 12 and is connected to the clean water pipe 13.

[0026] The lower part of the tank body 1 is provided with an upper branch pipe 16 and a bottom branch pipe 18 fixedly connected to the rotating shaft 15, and the upper branch pipe 16 and the bottom branch pipe 18 are respectively provided with a vertically arranged nozzle 19;

[0027] An isolation tube 7, a sand dividing ring groove 4 and an umbrella body 11 are provided on the upper part of the tank body 1. The top of the isolation tube 7 is a closed structure. The sand dividing ring groove 4 is fixed to the lower end of the isolation tube 7. The umbrella body 11 is a conical tube with a small upper part and a large lower part. The lower end of the umbrella body 11 is fixed to the inner wall of the tank body 1, and the upper end of the umbrella body 11 is supported on the sand dividing ring groove 4. The sand inlet pipe 2 is connected to the sand dividing ring groove 4 through the pipeline mixer 3. The sand dividing ring groove 4 and the umbrella body 11 are respectively provided with a through hole 21;

[0028] An overflow annular groove 9 is provided on the top of the tank body 1 , a water outlet pipe 10 is provided in the overflow annular groove 9 , and a sand discharge pipe 20 is provided at the bottom of the tank body 1 .

[0029] In this embodiment, refer to the attached Figure 1 The tank body 1 is made of welded steel plates, the upper part is cylindrical, the lower part is conical, and the bottom of the tank body 1 is gently inclined with an inclination angle of 10 to 25 degrees.

[0030] The inner wall of the tank body 1 supports the umbrella body 11, the upper edge of which is connected to the sand separation ring groove 4. The bottom of the sand separation ring groove 4 is at the same level as the bottom of the isolation tube 7, and water outlet windows 8 are reserved at regular intervals along the isolation tube 7. Through holes 21 are provided at regular intervals below the sand separation ring groove 4 and the umbrella body 11. The through holes 21 below the sand separation ring groove 4 ensure uniform sand distribution during sand feeding; the through holes 21 below the umbrella body 11 ensure that the flocculated tailings sediment slides into the space below the umbrella body 11.

[0031] The pipeline mixer 3 is a well-known device in the art, which is located outside the tank body 1 and installed on the sand inlet pipe 2. The sand inlet pipe 2 passes through the tank body 1 and extends directly to the inside of the sand dividing annular groove 4. A vent pipe 5 is provided on the upper part of the sand dividing annular groove 4.

[0032] The stirrer 6 is installed on the rotating shaft 15 in the middle of the bottom space of the isolation cylinder 7. The rotating coverage area of the stirrer 6 accounts for more than 60% of the hollow area at the bottom of the isolation cylinder 7.

[0033] The diameter of the rotating shaft 15 is larger than that of the upper branch pipe 16 and the bottom branch pipe 18. All are made of wear-resistant tubing, preferably seamless steel. The clean water pipe 13, collar 14, rotating shaft 15, upper branch pipe 16, and bottom branch pipe 18 are tightly connected. The bottom branch pipe 18 is parallel to the conical bottom of the tank body 1, with a spacing of 10 to 20 cm. The upper branch pipe 16 and the bottom branch pipe 18 are connected to a number of vertically upward-facing nozzles 19.

[0034] The isolation tube 7, the sand dividing ring groove 4 and the umbrella body 11 are connected into a whole, which divides the interior of the tank body 1 into two spaces, the upper space is the clarification and separation zone; the rotating surface formed by the upper branch pipe 16 rotating with the rotating shaft 15 divides the lower space into two parts, the area above the rotating surface is the preliminary flocculation and sedimentation area, and the area below the rotating surface is the sedimentation and compression area. The interior of the isolation tube 7 is the secondary stirring and flocculation area.

[0035] Here’s how it works:

[0036] The low-concentration ultra-fine tailings slurry with added medicine is first preliminarily coagulated in the pipeline mixer 3, enters the sand dividing ring groove 4 through the sand inlet pipe 2, and then evenly enters the preliminary flocculation and sedimentation zone through the through hole 21 below the sand dividing ring groove 4; in the preliminary flocculation and sedimentation zone, the low-concentration ultra-fine tailings slurry undergoes preliminary solid-liquid separation under gravity conditions; the ultra-fine tailings slurry forms a high-concentration slurry and enters the sedimentation and compression zone; the solid content of the low-concentration ultra-fine tailings slurry becomes even less, and under the stirring and lifting action of the stirrer 6, it enters the secondary stirring and flocculation zone to form larger flocs, and then passes through the water outlet window 8. It enters the clarification and separation area for secondary solid-liquid separation; the clarified water is discharged through the overflow ring groove 9 and the outlet pipe 10; the precipitated ultrafine tailings mud returns to the preliminary flocculation and sedimentation area through the through hole 21 under the umbrella body 11, and re-participates in the flocculation and sedimentation operation; in the sedimentation and compression area, the high-concentration ultrafine tailings slurry always maintains an activated paste state under the rotational shearing action of the upper branch pipe 16 and the bottom branch pipe 18; and high-pressure water slurrying operation is carried out through the nozzle 19, and the concentration of the ultrafine tailings slurry in the sedimentation and compression area is artificially adjusted to meet the controllable requirements of the filling sand concentration.

Claims

1. A low-concentration ultra-fine tailings dense filling device, characterized by: The sand discharging device comprises a tank body (1), a sand feeding pipe (2), a pipe mixer (3), a sand dividing ring groove (4), an isolation cylinder (7), an umbrella body (11), a driving unit (12), a clean water pipe (13), a rotating shaft (15), an upper branch pipe (16), a bottom branch pipe (18), a nozzle (19) and a sand discharge pipe (20), wherein the rotating shaft (15) is tubular and vertically arranged at the center of the tank body (1). The driving unit (12) is provided at the upper end of the rotating shaft (15) and is connected to the clean water pipe (13). The lower portion of the tank body (1) is provided with an upper branch pipe (16) and a bottom branch pipe (18) fixedly connected to the rotating shaft (15), and the upper branch pipe (16) and the bottom branch pipe (18) are respectively provided with vertically arranged nozzles (19); The upper portion of the tank body (1) is provided with an isolation cylinder (7), a sand dividing annular groove (4) and an umbrella body (11); the top of the isolation cylinder (7) is a closed structure; the sand dividing annular groove (4) is fixed to the lower end of the isolation cylinder (7); the umbrella body (11) is a tapered cylinder with a smaller upper portion and a larger lower portion; the lower end of the umbrella body (11) is fixed to the inner wall of the tank body (1); the upper end of the umbrella body (11) is supported on the sand dividing annular groove (4); the sand inlet pipe (2) is connected to the sand dividing annular groove (4) through a pipe mixer (3); and through holes (21) are respectively provided on the sand dividing annular groove (4) and the umbrella body (11); An overflow annular groove (9) is provided on the top of the tank body (1), a water outlet pipe (10) is provided in the overflow annular groove (9), and a sand discharge pipe (20) is provided at the bottom of the tank body (1); The isolation cylinder (7), the sand separation ring groove (4) and the umbrella body (11) are connected into a whole, dividing the interior of the tank body (1) into two spaces, the upper space being a clarification and separation zone; the rotating surface formed by the upper branch pipe (16) rotating with the rotating shaft (15) divides the lower space into two parts, the area above the rotating surface being a preliminary flocculation and sedimentation zone, the area below the rotating surface being a sedimentation and compression zone, and the interior of the isolation cylinder (7) being a secondary stirring and flocculation zone; A stirrer (6) is fixed on the rotating shaft (15), and the stirrer (6) is located at the bottom of the isolation cylinder (7); The sand dividing annular groove (4) is connected to the air vent pipe (5).

2. A low-concentration ultra-fine tailings dense filling device according to claim 1, characterized in that: The isolation cylinder (7) is provided with a water outlet window (8) that is connected to the clarification and separation zone.

3. The low-concentration ultra-fine tailings dense filling device according to claim 1, characterized in that: The upper portion of the tank body (1) is cylindrical, and the lower portion is conical.

4. A low-concentration ultra-fine tailings dense filling device according to claim 3, characterized in that: The inclination angle of the bottom of the tank body (1) is 10 to 25 degrees.

5. The low-concentration ultra-fine tailings dense filling device according to claim 4, characterized in that: The bottom branch pipe (18) is arranged parallel to the bottom of the tank body (1).

6. The low-concentration ultra-fine tailings dense filling device according to claim 1, characterized in that: The upper branch pipe (16) and the bottom branch pipe (18) are connected via a plurality of vertical rods (17).

7. A low-concentration ultrafine tailings concentration method, characterized by: A low-concentration ultra-fine tailings dense filling device as defined in any one of claims 1 to 6 is used and operated according to the following steps: ① The low-concentration ultrafine tailings slurry with added medicine is first preliminarily flocculated in the pipeline mixer (3), then enters the sand separation ring groove (4) through the sand inlet pipe (2), and enters the preliminarily flocculated sedimentation area through the through hole (21) on the sand separation ring groove (4); ② In the initial flocculation and sedimentation area, the low-concentration ultrafine tailings slurry is under gravity conditions, and the high-concentration slurry enters the sedimentation and compression area; The low-concentration slurry enters the secondary stirring and flocculation zone under the stirring and lifting action of the stirrer (6), forms larger flocs, and then enters the clarification and separation zone through the water outlet window (8) for secondary solid-liquid separation; the clarified water is discharged through the overflow ring groove (9) and the water outlet pipe (10); the precipitated ultrafine tailings mud returns to the primary flocculation and sedimentation zone through the through hole (21) on the umbrella body (11) and participates in the flocculation and sedimentation operation again; ③ In the settlement and compression zone, the high-concentration mortar is always kept in an activated paste state under the rotational shearing action of the upper branch pipe (16) and the bottom branch pipe (18), and a high-pressure water slurrying operation is performed through the nozzle (19) to adjust the concentration of the ultra-fine tailings mortar in the settlement and compression zone to meet the filling sand concentration requirements.

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