A thickener with anti-pressure rake function and sand storage method thereof

Abstract

The present invention proposes a thickener with an anti-pressure rake function and a sand storage method thereof, comprising a conical bottom pool, a support column is provided at the center of the bottom surface of the conical bottom pool, the support column is connected to the top surface of a flow stabilizing tube, the flow stabilizing tube is connected to a feeding mechanism, the support column body is rotatably connected to an inner sleeve, a rake frame is provided at the bottom end of the inner sleeve, the inner sleeve body is rotatably connected to an outer sleeve, a rake rod is provided at the bottom end of the outer sleeve, a stirring ring built into the flow stabilizing tube is provided at the middle end of the outer sleeve, and the upper end gear rings of the two sleeves are respectively meshed with the output end gears of two driving motors; the present invention also proposes a sand storage method of the thickener, comprising the steps of feeding and mixing, secondary flocculation, activation and dilution, and stable discharge; the invention can effectively avoid the pressure rake phenomenon in the sand storage process, solves the stratification problem of coarse-grained tailings in the continuous sand feeding process, effectively improves the sand feeding efficiency and the filling body strength, and can obtain high-concentration slurry in a short time.

Description

Technical Field

[0001] The invention relates to the technical field of sand storage equipment, and in particular to a thickener with an anti-pressure rake function and a sand storage method thereof. Background Art

[0002] The thickener is a solid-liquid separation device based on gravity sedimentation. It can concentrate low-concentration slurry into high-concentration underflow slurry through gravity sedimentation. It uses a slow-running rake installed in the tank body to discharge the thickened underflow slurry from the underflow port at the bottom of the thickener. This process is called sand storage. During sand storage operations, serious "rake pressure" phenomenon often occurs. It is mainly caused by the compaction of the bottom of the deep cone thickener. The compaction will form a relatively serious multi-layer "sandwich biscuit" at the bottom of the tank body, seriously affecting the fluidity and stability of the sand storage. The compaction phenomenon is usually caused by a large difference in the particle size distribution of the tailings. At this time, the flocculant dilution liquid of the same mass concentration and the tailings of different particle sizes cannot effectively form flocs of the same mass for common sedimentation, resulting in stratification of the tailings. The separation layer in the thick area solidifies into compaction, which hinders the rotation of the rake frame, and finally causes the rake pressure phenomenon. A new type of sand storage equipment and method is needed to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a thickener with an anti-pressure raking function, including a conical bottom pool, a support column is provided at the center of the bottom surface of the conical bottom pool, the support column is connected to the top surface of the flow stabilizer, the flow stabilizer is connected to the feeding mechanism, the support column body is rotatably connected to the inner sleeve, the bottom end of the inner sleeve is provided with a rake frame, the inner sleeve body is rotatably connected to the outer sleeve, the bottom end of the outer sleeve is provided with a rake rod, the middle end of the outer sleeve is provided with a stirring ring built into the flow stabilizer, and the upper end gear rings of the two sleeves are respectively meshed with the output end gears of the two driving motors.

[0004] Furthermore, the feeding mechanism includes a mud pipe, which extends into the stabilizer cylinder along the bridge frame. The bridge frame divides the stabilizer cylinder into an equipment room and a mixing chamber. Two driving motors are vertically installed on the bracket of the upper equipment room. A flocculation tube is provided above the mud pipe. The flocculation tube is connected to the central control valve in the equipment room, and the central control valve is connected to the feeding ring at the upper end of the mixing chamber.

[0005] Furthermore, a concentration adjusting valve is provided at the bottom end of the cone of the conical bottom pool, the concentration adjusting valve is connected to the input end of the dilution pump, and the output end of the dilution pump is connected to the discharge valve at the top end of the cone of the conical bottom pool; an overflow pool is provided around the open outer side of the conical bottom pool, the overflow pool is fixed on the annular aisle of the conical bottom pool, a circulation pump is installed on the top surface of the annular aisle, the input end of the circulation pump is connected to the bottom of the overflow pool, and the output end of the circulation pump is connected to the feeding mechanism.

[0006] Furthermore, a plurality of scrapers are provided at the bottom of the rake frame, and the scrapers cooperate with the inner oblique conical surface of the conical bottom pool. A pull rod connected to the middle section of the inner sleeve is provided at the top of the rake frame, and a plurality of guide rods A extending vertically downward are provided on the pull rod body.

[0007] Furthermore, the rake rod is horizontal and located at the vertical wall of the conical bottom pool, and the rake rod body is provided with a plurality of guide rods B vertically downward, and each guide rod B gradually lengthens from the outside to the inside.

[0008] Furthermore, the discharge ring groove of the flow stabilizing tube is arranged on the bottom side of the flow stabilizing tube.

[0009] The present invention also proposes a sand storage method for the thickener, comprising the following steps:

[0010] Feeding and mixing: Inject slurry and flocculant into the flow stabilizing cylinder through the feeding mechanism. The amount of flocculant is 15±1g / t. Start the drive motor connected to the outer sleeve, control the speed of the stirring ring at 20-25r / min, and throw the mixed slurry from the discharge ring groove into the cone bottom pool;

[0011] Secondary flocculation: When the clarification area at the top of the slurry overflows into the overflow tank, the circulation pump is started to return the overflow water to the central control valve and re-inject it into the conical bottom tank through the flow stabilizing cylinder. At this time, the outer sleeve remains stationary and the speed of the inner sleeve is 0.3-0.4r / min;

[0012] Activation dilution: When the mud layer in the sedimentation area exceeds 8m or the bottom flow concentration is ≥75%, open the concentration valve and discharge valve every hour, start the circulation pump at 3-4m 3 / h to transport the mud in the sedimentation area to the transition area. At this time, the speed of the outer sleeve is 5-6r / min, and the speed of the inner sleeve is 0.6-0.8r / min, which lasts for 8-10 minutes;

[0013] Stable discharge: When the mud layer is ≥10m and the slurry concentration is ≥75%, open the discharge valve at the bottom of the cone bottom tank and discharge the material at a rate of 5-6m 3 High-concentration slurry is discharged at a rate of / h.

[0014] The beneficial effects of the present invention are as follows: the present invention can effectively avoid the rake pressure phenomenon in the sand storage process through secondary backflow of overflow water, differentiated rotation speeds of the rake frame and the rake rod, and targeted measures to increase the activity of the bottom flow high-concentration slurry, solve the stratification problem of coarse-grained tailings in the process of continuous sand feeding, effectively improve the sand feeding efficiency and filling body strength, and can obtain high-concentration slurry in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0017] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0018] The reference numerals in the accompanying drawings are as follows: 1. Cone bottom tank; 101. Concentration adjustment valve; 102. Discharge valve; 103. Annular passage; 2. Support column; 3. Flow stabilizer; 301. Equipment room; 302. Mixing chamber; 303. Discharge ring groove; 4. Inner sleeve; 5. Rake frame; 501. Scraper; 502. Pull rod; 503. Guide rod A; 6. Outer sleeve; 7. Rake rod; 701. Guide rod B; 8. Agitation ring; 9. Drive motor; 10. Mud pipe; 11. Bridge; 12. Flocculation pipe; 13. Central control valve; 14. Feeding ring; 15. Dilution pump; 16. Overflow tank; 17. Circulation pump. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The present invention will be further described below in conjunction with the accompanying drawings:

[0022] like Figures 1 to 3As shown, a thickener with an anti-pressure rake function includes a conical bottom pool 1, a support column 2 is provided at the center of the bottom surface of the conical bottom pool 1, the support column 2 is connected to the top surface of the stabilizing tube 3, the stabilizing tube 3 is connected to the feeding mechanism, the feeding mechanism includes a mud pipe 10, the mud pipe 10 extends into the stabilizing tube 3 along a bridge frame 11, the bridge frame 11 divides the stabilizing tube 3 into an equipment room 301 and a mixing chamber 302, two sets of drive motors 9 are vertically installed on the bracket of the upper end equipment room 301, and each set of drive motors 9 is arranged as needed 1-4 units, the same group of driving motors 9 are evenly distributed in a ring on the same layer of brackets, a flocculation tube 12 is arranged above the mud pipe 10, the flocculation tube 12 is connected to the central control valve 13 in the equipment room 301, the central control valve 13 is connected to the feeding ring 14 at the upper end of the mixing chamber 302, the feeding ring 14 is provided with a solenoid valve, the discharge ring groove 303 of the flow stabilizing tube 3 is opened on the bottom side of the flow stabilizing tube 3, the slurry mixed with the flocculant in the mixing chamber 302 falls into the conical bottom pool 1 in a parabola through the discharge ring groove 303.

[0023] In this embodiment, the support column 2 is rotatably connected to the inner sleeve 4. The bottom of the inner sleeve 4 is provided with a rake frame 5. The bottom of the rake frame 5 is provided with a plurality of scrapers 501. The scrapers 501 cooperate with the inner oblique cone surface of the conical bottom pool 1. The top of the rake frame 5 is provided with a pull rod 502 connected to the middle section of the inner sleeve 4. The pull rod 502 is provided with a plurality of vertical downward guide rods A503. The inner sleeve 4 is rotatably connected to the outer sleeve 6. The bottom of the outer sleeve 6 is provided with a rake rod 7. The rake rod 7 is horizontal and located at the vertical wall of the conical bottom pool 1. The rake rod 7 is provided with a plurality of vertical downward guide rods B701. Each guide rod B701 gradually lengthens from the outside to the inside. The guide rods A503 and the guide rods B701 are spaced apart. The middle end of the outer sleeve 6 is provided with a stirring ring 8 built into the flow stabilizing tube 3. The stirring ring 8 can accelerate the mixing of the flocculant and the slurry. The gear rings at the upper ends of the two sleeves are respectively meshed with the output end gears of the two drive motors 9.

[0024] In this embodiment, a concentration adjusting valve 101 is provided at the bottom end of the cone of the conical bottom pool 1, and the concentration adjusting valve 101 is connected to the input end of the dilution pump 15, and the output end of the dilution pump 15 is connected to the discharge valve 102 at the top end of the cone of the conical bottom pool 1; an overflow pool 16 is provided around the open outer side of the conical bottom pool 1, and the overflow pool 16 is fixed on the annular passage 103 of the conical bottom pool 1, and a circulation pump 17 is installed on the top surface of the annular passage 103, and the input end of the circulation pump 17 is connected to the bottom of the overflow pool 16, and the output end of the circulation pump 17 is connected to the central control valve 13 in the feeding mechanism.

[0025] The present invention also proposes a sand storage method for the thickener, comprising the following steps:

[0026] Feeding and mixing: the slurry and flocculant are injected into the flow stabilizing cylinder 3 through the feeding mechanism, the driving motor 9 connected to the outer sleeve 6 is started, the speed of the stirring ring 8 is controlled at 20-25r / min, and the mixed slurry is thrown from the discharge ring groove 303 into the cone bottom pool 1. The amount of flocculant used in this process is 15±1g / t. This amount of flocculant can react with the fine tailings of the deep cone thickener and the smaller flocs generated in advance, and wrap the larger particle size tailings, effectively forming flocs of the same mass size for common sedimentation;

[0027] Secondary flocculation: When the clarification area at the top of the slurry overflows to the overflow tank 16, the circulation pump 17 is started to return the overflow water to the central control valve 13, and re-inject it into the conical bottom tank 1 through the flow stabilizing tube 3. At this time, the outer sleeve 6 remains stationary, and the rotation speed of the inner sleeve 4 is 0.3-0.4r / min. The overflow water containing a small amount of flocculant dilution liquid is secondary refluxed, which can lock the fine-grained tailings particles in advance to form smaller flocs to avoid loss, and reduce the tailings concentration and the tailings content per unit volume, so as to promote the tailings and flocculants to fully react with each other, form flocs with the same mass ratio, and balance the mass ratio;

[0028] Activation dilution: When the mud layer in the sedimentation area exceeds 8m or the bottom flow concentration is ≥75%, open the concentration adjustment valve 101 and the discharge valve 102 every 1h, start the circulation pump 17 at 3-4m 3 / h speed to transport the mud in the sedimentation area to the transition area. At this time, the speed of the outer sleeve 6 is 5-6r / min, and the speed of the inner sleeve 4 is 0.6-0.8r / min, which lasts for 8-10min. This process can increase the activity of the high-concentration slurry in the bottom flow. Through the differentiated cutting sand layer speed in different areas, the tailings particles can be rearranged under the action of gravity and mud layer pressure, and the water in the cracks overflows along the water guide rod and rises to the upper layer of the mud layer, and the surrounding fine particles fall into the pores, so that the tailings are fully compacted;

[0029] Stable discharge: When the mud layer is ≥10m and the slurry concentration is ≥75%, the discharge valve at the bottom of the cone bottom pool 1 is opened to discharge the high-concentration slurry at a rate of 5-6m3 / h. By adopting the above equipment and methods, some mines have achieved good results. At present, the system has been running stably for 2 years, with a total filling volume of more than 200,000m 3 There was no "rake pressure" incident, and the filling strength of the mining area was ≥2.5MPa during the three-day inspection.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A sand storage method for a thickener with an anti-pressure rake function, the thickener comprising a conical bottom pool (1), a support column (2) is provided at the center of the bottom surface of the conical bottom pool (1), the support column (2) is connected to the top surface of a stabilizing cylinder (3), the stabilizing cylinder (3) is connected to a feeding mechanism, a discharge ring groove (303) of the stabilizing cylinder (3) is provided on the bottom side of the stabilizing cylinder (3), the support column (2) is rotatably connected to an inner sleeve (4), a rake frame (5) is provided at the bottom end of the inner sleeve (4), the inner sleeve (4) is rotatably connected to an outer sleeve (6), a rake rod (7) is provided at the bottom end of the outer sleeve (6), a stirring ring (8) built into the stabilizing cylinder (3) is provided at the middle end of the outer sleeve (6), and gear rings are provided at the upper ends of the two sleeves. The conical bottom tank (1) is provided with a concentration control valve (101) at the bottom of the conical portion, the concentration control valve (101) is connected to the input end of the dilution pump (15), and the output end of the dilution pump (15) is connected to the discharge valve (102) at the top of the conical portion of the conical bottom tank (1); an overflow tank (16) is provided around the open outer side of the conical bottom tank (1), the overflow tank (16) is fixed on the annular passage (103) of the conical bottom tank (1), a circulation pump (17) is installed on the top surface of the annular passage (103), the input end of the circulation pump (17) is connected to the bottom of the overflow tank (16), and the output end of the circulation pump (17) is connected to the feeding mechanism; the sand storage method of the thickener comprises the following steps: Feeding and mixing: the slurry and flocculant are injected into the flow stabilizing cylinder (3) through the feeding mechanism, the amount of flocculant is 15±1g / t, the driving motor (9) connected to the outer sleeve (6) is started, the rotation speed of the stirring ring (8) is controlled at 20-25r / min, and the mixed slurry is thrown from the discharge ring groove (303) into the conical bottom pool (1); Secondary flocculation: When the slurry top clarifying area overflows to the overflow tank (16), the circulation pump (17) is started to return the overflow water to the feeding mechanism and re-inject it into the conical bottom tank (1) through the flow stabilizing cylinder (3). At this time, the outer sleeve (6) remains stationary and the rotation speed of the inner sleeve (4) is 0.3-0.4r / min; Activation dilution: When the mud layer in the sedimentation area exceeds 8m or the bottom flow concentration is ≥75%, open the concentration adjustment valve (101) and the discharge valve (102) every hour, start the circulation pump (17) at 3-4m 3 / h to transport the mud in the sedimentation zone to the transition zone, at which time the speed of the outer sleeve (6) is 5-6 r / min, and the speed of the inner sleeve (4) is 0.6-0.8 r / min, and the duration is 8-10 minutes; Stable discharge: When the mud layer is ≥10m and the slurry concentration is ≥75%, open the bottom discharge valve of the cone bottom tank (1) and discharge the material at a rate of 5-6m 3 High-concentration slurry is discharged at a rate of / h.

2. The sand storage method of a thickener with an anti-pressure rake function according to claim 1, characterized in that: The feeding mechanism comprises a mud pipe (10), the mud pipe (10) extending into the flow stabilizing cylinder (3) along a bridge frame (11), the bridge frame (11) dividing the flow stabilizing cylinder (3) into an equipment chamber (301) and a mixing chamber (302), two driving motors (9) vertically mounted on a bracket of the upper equipment chamber (301), a flocculation pipe (12) being arranged above the mud pipe (10), the flocculation pipe (12) being connected to a central control valve (13) in the equipment chamber (301), and the central control valve (13) being connected to a feeding ring (14) at the upper end of the mixing chamber (302).

3. The sand storage method of a thickener with an anti-pressure rake function according to claim 1, characterized in that: The bottom of the rake frame (5) is provided with a plurality of scrapers (501), the scrapers (501) cooperate with the inner oblique conical surface of the conical bottom pool (1), the top of the rake frame (5) is provided with a pull rod (502) connected to the middle section of the inner sleeve (4), and the pull rod (502) is provided with a plurality of guide rods A (503) extending vertically downward.

4. The sand storage method of a thickener with an anti-pressure rake function according to claim 1, characterized in that: The rake rod (7) is horizontal and located at the vertical wall of the conical bottom pool (1). The rake rod (7) is provided with a plurality of guide rods B (701) extending vertically downward, and each guide rod B (701) gradually lengthens from the outside to the inside.

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