Device and method for recovering fine-grained minerals from scrabbling waste rocks
By designing ore outlet troughs and trenches with specific angles and intervals, and combining them with spray water flow, the problem of low recovery rate of fine-grained minerals was solved, achieving efficient and low-cost recovery of fine-grained minerals and improving resource utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-03-13
AI Technical Summary
In existing mining processes, fine-grained minerals are easily lost with waste rock, leading to resource waste. Furthermore, the recycling methods are complex, costly, and have low recovery rates, making it difficult to meet actual production needs.
Design a device for recovering fine minerals from waste rock from barn, including a waste rock bin, a discharge trough, a channel, and a nozzle assembly. By setting the discharge trough and channel at specific angles and intervals, combined with spray water flow, the efficient recovery of fine minerals can be achieved.
It improves the recovery rate and grade of fine-grained minerals, reduces recovery costs, and has significant economic and social benefits. The equipment is also easy to maintain.
Smart Images
Figure CN121649036A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of mineral processing technology, specifically an apparatus and method for recovering fine-grained minerals from waste rock from barn. Background Technology
[0002] During mining and processing, the ore produced underground first undergoes screening via a screen. The ore below the screen enters the concentrator for further separation, while the larger waste rocks above are washed and manually separated before being disposed of in a waste rock bin. In this process, some fine-grained minerals are easily lost with the waste rock, resulting in resource waste. Existing recovery methods suffer from complex processes, high costs, and low recovery rates, making it difficult to meet actual production needs. Therefore, there is an urgent need for an efficient and low-cost method for recovering fine-grained minerals to improve resource utilization. Summary of the Invention
[0003] The present invention provides an apparatus for recovering fine minerals from waste rock from a dumping site, comprising: a waste rock bin, a first ore outlet trough, a second ore outlet trough, a first trench, a first nozzle group, a second nozzle group, a first ore delivery pipe, and a sedimentation tank; The waste rock bin includes a ore outlet, which is equipped with a gate to control whether ore is discharged from the outlet. The ore outlet is connected to a first ore discharge trough, which is set at a first angle to the horizontal plane. The second ore discharge trough is set at a second angle to the horizontal plane. The first and second ore discharge troughs are spaced apart. The ends of the first and second ore discharge troughs near the second ore discharge troughs are vertically spaced by a first drop. The end of the second ore discharge trough near the first ore discharge trough is provided with a first groove. The ends of the first and second ore discharge troughs near the second ore discharge troughs are horizontally spaced by a first interval and vertically lower than the end of the first and second ore discharge troughs near the second ore discharge troughs, and spaced by a second drop. The first ore delivery pipe connects the first groove and the sedimentation tank, and is used to transport fine-grained minerals in the first groove to the sedimentation tank. The first angle is greater than or equal to 20° and less than or equal to 40°, the first angle is greater than the second angle, and the difference between the first angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the first drop is 100-500mm, the first spacing is 1-3mm larger than the particle size of the fine minerals in the waste rock bin, and the second drop is 25-30mm. The first nozzle group is used to spray water into the waste rock bin, so that the fine minerals in the waste rock bin flow out with the water flow. The second nozzle group is used to spray water into the first ore outlet trough, so that the fine minerals in the first ore outlet trough flow out with the water flow.
[0004] This also includes: the third ore outlet, the second trench, the second ore delivery pipe, and the third nozzle group; The third ore outlet trough is set at a third angle to the horizontal plane. The third ore outlet trough is spaced apart from the second ore outlet trough. The end of the second ore outlet trough near the third ore outlet trough and the end of the third ore outlet trough near the second ore outlet trough are set at a third vertical drop. A second ditch is set at the end of the third ore outlet trough near the second ore outlet trough. The end of the second ditch near the third ore outlet trough and the end of the second ore outlet trough near the third ore outlet trough are set at a second horizontal distance. The second ditch is set at a fourth vertical drop and is lower than the end of the second ore outlet trough near the third ore outlet trough. The second ore delivery pipe connects the second ditch and the sedimentation tank and is used to transport the fine-grained minerals in the second ditch to the sedimentation tank. The third angle is greater than the second angle, the difference between the third angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the third drop is 100-500mm, the first spacing is 1-3mm larger than the particle size of the fine minerals in the waste rock bin, and the fourth drop is 25-30mm. The third nozzle group is used to spray water onto the second ore outlet trough, so that the fine minerals in the second ore outlet trough flow out with the water flow.
[0005] The angle between the second nozzle group and the first ore outlet trough is the first angle, which is 74°-78°.
[0006] The angle between the third nozzle group and the second ore outlet is the second angle, which is greater than the first angle, and the difference between the second angle and the first angle is greater than or equal to 2° and less than or equal to 5°.
[0007] The water pressure of the first nozzle group, the second nozzle group, and the third nozzle group is 0.3-0.8 MPa.
[0008] The width of the first groove and the second groove is less than or equal to 30 mm, and the bottom is inclined from the center outward with an inclination angle greater than or equal to 3° and less than or equal to 30°.
[0009] Fine-grained minerals are recovered after settling in the sedimentation tank for 1-3 hours.
[0010] It also includes an overflow pool, which is connected to the sedimentation pool to recover excess water in the sedimentation pool and can be recycled after further sedimentation.
[0011] The present invention also provides a method for recovering fine-grained minerals from waste rock from barn construction sites, using the aforementioned apparatus for recovering fine-grained minerals from waste rock from barn construction sites, comprising the following steps: S1. Detect the particle size of fine minerals in the waste rock bin, and set the first spacing so that fine minerals in the waste rock bin can pass through; S2. Set the first angle, the second angle, the first drop, and the second drop to satisfy the following conditions: the first angle is greater than or equal to 20° and less than or equal to 40°, the first angle is greater than the second angle, and the difference between the first angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the first drop is 100-500mm, and the second drop is 25-30mm. S3. Open the first nozzle group, open the second nozzle group after 5-10 seconds, then open the gate to release ore, and close the gate after the ore release is completed; S4. After the fine minerals enter the sedimentation tank with the water flow, they settle for 1-3 hours to recover the fine minerals.
[0012] Among them, the recovery rate of fine-grained minerals is greater than or equal to 70%, and the grade of fine-grained minerals is greater than or equal to 0.40%; Furthermore, the present invention provides a technical solution with three ore outlets and two trenches, which achieves a fine-grained mineral recovery rate of greater than or equal to 85% and a fine-grained mineral grade of greater than or equal to 0.40%.
[0013] The recovery rate is calculated as follows: The mass of waste rock in the waste rock bin is measured as M, and its grade as N. After recovery, the mass of fine-grained minerals in the sedimentation tank is measured as m, and its grade as n. The recovery rate is then calculated as follows: .
[0014] This invention, by setting the angle and spacing between ore outlets and multiple nozzle groups, and setting corresponding trenches, can fully recover fine-grained minerals from waste rock from quarrying, improve resource utilization, and has significant economic and social benefits, while being low in cost and easy to maintain. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0016] Figure 1 This is a side view of the apparatus for recovering fine-grained minerals from waste rock in an embodiment of the present invention; Figure 2 This is a front view of the apparatus for recovering fine-grained minerals from waste rock in an embodiment of the present invention; Figure 3This is a three-dimensional view of the apparatus for recovering fine-grained minerals from waste rock in an embodiment of the present invention; Figure 4 for Figure 1 A partial view.
[0017] Wherein: 10-waste rock bin, 11-gate, 21-first ore outlet trough, 22-second ore outlet trough, 23-third ore outlet trough, 31-first trench, 32-second trench, 311-first ore delivery pipe, 312- Figure 1 Partial view, 313-side wall of the first trench near the second ore outlet, 321-second ore delivery pipe, 41-first nozzle group, 42-second nozzle group, 43-third nozzle group, 51-sedimentation tank, 52-overflow water tank.
[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0019] The technical solutions described below in conjunction with the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] This invention provides an apparatus for recovering fine-grained minerals from waste rock from a dumping site. In one embodiment of the apparatus for recovering fine-grained minerals from waste rock from a dumping site, at least two ore outlets and one trench are used to recover the fine-grained minerals in the waste rock bin 10. Alternatively, multiple ore outlets can be used in conjunction with multiple trenches to recover the fine-grained minerals. Using multiple ore outlets and multiple trenches to recover the fine-grained minerals can improve the recovery rate of useful fine particles in the fine-grained minerals.
[0021] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a side view of the apparatus for recovering fine-grained minerals from waste rock in an embodiment of the present invention; Figure 2 This is a front view of the apparatus for recovering fine-grained minerals from waste rock in an embodiment of the present invention; Figure 3 This is a three-dimensional view of the apparatus for recovering fine-grained minerals from waste rock in an embodiment of the present invention; Figure 4 for Figure 1 Partial view 312.
[0022] In one embodiment of the present invention, the waste rock bin 10 contains waste rock recovered from the ballast process, with a grade of 0.0010%-0.0014%. The waste rock bin 10 is equipped with a gate 11 for controlling whether the waste rock bin 10 is opened. The waste rock bin 10 is equipped with a first nozzle group 41, which sprays water into the waste rock bin to make fine minerals flow out with the water flow. A first ore outlet 21 is provided at the gate 11. A second ore outlet 22 is provided at a distance from the end of the first ore outlet 21 away from the gate 11. A third ore outlet 23 is provided at a distance from the end of the second ore outlet 22 away from the first ore outlet 21. The first ore outlet 21 forms a first angle with the horizontal direction, the second ore outlet 22 forms a second angle with the horizontal direction, and the third ore outlet 23 forms a third angle with the horizontal direction. The first angle, the second angle, and the third angle are all greater than or equal to 20° and less than or equal to 40°. The first angle is greater than the second angle, the third angle is greater than the second angle, the difference between the first angle and the second angle is greater than or equal to 2° and less than or equal to 5°, and the difference between the third angle and the second angle is greater than or equal to 2° and less than or equal to 5°. The first ore outlet 21 is vertically separated from the second ore outlet 22 by a first drop, and the second ore outlet 22 is vertically separated from the third ore outlet 23 by a third drop. The range of the first drop and the third drop is 100-500mm. The second nozzle group 42 is used to spray the surface of the first ore outlet 21, and the spray angle is at a first angle to the surface of the first ore outlet 21. The third nozzle group 43 is used to spray the surface of the second ore outlet 22, and the spray angle is at a second angle to the surface of the second ore outlet 22. The first angle and the second angle are greater than or equal to 74° and less than or equal to 78°. The second angle is greater than the first angle. The difference between the second angle and the first angle is greater than or equal to 2° and less than or equal to 5°. The first groove 31 is disposed above the bottom plate of the second ore outlet 22 and below the bottom plate of the first ore outlet 22. The horizontal distance between the side wall 313 of the first groove 31 near the second ore outlet 22 and the end of the first ore outlet 21 near the first groove 31 is the first distance. Similarly, the horizontal distance between the second groove 32 and the end of the second ore outlet 22 near the second groove 32 is the second distance. The first distance and the second distance allow fine-grained minerals to pass through. In this embodiment, the particle size of the fine-grained minerals is greater than 8 mm and less than 12 mm. Therefore, the first distance and the second distance can be set to 12-15 mm. In other embodiments, when the particle size of the fine-grained minerals is in other ranges, such as less than 8 mm, the first distance and the second distance can be set to 8-12 mm. The first groove 31 is set vertically below the end of the first ore outlet 21 near the second ore outlet 22 and is spaced apart by a second drop. The second groove 32 is set vertically below the end of the second ore outlet 22 near the third ore outlet 23 and is spaced apart by a fourth drop. The bottom of the first trench 31 is connected to a first ore delivery pipe 311, and the bottom of the second trench 32 is connected to a second ore delivery pipe 321. The first ore delivery pipe 311 and the second ore delivery pipe 321 are used to transport the fine particles collected in the first trench 31 and the second trench 32 to the sedimentation tank 51. The sedimentation tank 51 is also connected to an overflow water tank 52 for recycling excess water.
[0023] In one embodiment of the present invention, each trench is provided with an inclination angle, which is inclined to both sides along the center of the bottom of the trench, and the inclination angle is greater than or equal to 3° and less than or equal to 30°.
[0024] The present invention also provides a method for recovering fine-grained minerals from waste rock from barn construction sites, employing the aforementioned apparatus for recovering fine-grained minerals from waste rock from barn construction sites; in one embodiment of the method for recovering fine-grained minerals from waste rock from barn construction sites according to the present invention, the method includes the following steps: S1. Detect the particle size of fine minerals in the waste rock bin, and set the first spacing so that fine minerals in the waste rock bin can pass through; S2. Set the first angle, the second angle, the first drop, and the second drop to satisfy the following conditions: the first angle is greater than or equal to 20° and less than or equal to 40°, the first angle is greater than the second angle, and the difference between the first angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the first drop is 100-500mm, and the second drop is 25-30mm. S3. Open the first nozzle group, open the second nozzle group after 5-10 seconds, then open the gate to release ore, and close the gate after the ore release is completed; S4. After the fine minerals enter the sedimentation tank with the water flow, they settle for 1-3 hours to recover the fine minerals.
[0025] The above embodiment uses a trench to recover fine-grained minerals, achieving a recovery rate of ≥70% and a grade of ≥0.4%. In this invention, a device with three ore outlets and two trenches is used for recovery, increasing the recovery rate to ≥85% and the grade to ≥0.4%. Further, while adding more outlets and trenches could further improve the recovery rate and grade, it would increase costs significantly. The device of this invention achieves both a high recovery rate and a high grade of fine-grained minerals. This is because processing recovered minerals incurs costs, with lower grades incurring higher costs. Therefore, this invention improves the recovery rate while maintaining the grade, enabling the recovery of large quantities of fine-grained minerals while reducing subsequent processing costs.
[0026] Example 1 The recovery process uses a device consisting of two ore outlets and one trench. The particle size of fine minerals in the waste rock bin is less than 12mm, and the first spacing is set to 15mm; The first angle is set to 28°, the second angle to 25°, the first drop to 300mm, and the second drop to 30mm. Open the first nozzle group, open the second nozzle group after 5 seconds, then open the gate to release ore, and close the gate after the ore is released. The first included angle is 74° and the water pressure is 0.6MPa. After the fine minerals enter the sedimentation tank with the water flow, they settle for 1 hour to recover the fine minerals.
[0027] The waste rock in the waste rock silo weighs 9,000 tons and has a grade of 0.0012%. The fine-grained minerals in the sedimentation tank weigh 18.44 tons and have a grade of 0.41%. The recovery rate of the fine-grained minerals is calculated to be (18.44 × 0.41%) ÷ (9,000 × 0.0012%) = 70.0%.
[0028] Example 2 The recovery process uses a device with three ore outlets and two trenches; The particle size of fine minerals in the waste rock bin is less than 12mm. The first spacing is set to 15mm and the second spacing is set to 15mm. The first angle is set to 28°, the second angle to 25°, the third angle to 28°, the first drop to 300mm, the second drop to 30mm, the third drop to 350mm, and the fourth drop to 30mm. Open the first nozzle group, open the second nozzle group after 5 seconds, then open the gate to discharge ore, and close the gate after the ore discharge is completed. The first included angle is 74°, the second included angle is 76°, and the water pressure is 0.6MPa. After the fine minerals enter the sedimentation tank with the water flow, they settle for 1 hour to recover the fine minerals.
[0029] The waste rock in the waste rock silo weighs 9,000 tons and has a grade of 0.0012%. The fine-grained minerals in the sedimentation tank weigh 24 tons and have a grade of 0.4%. The recovery rate of the fine-grained minerals is calculated to be (24 × 0.4%) ÷ (9,000 × 0.0012%) = 88.9%.
[0030] Example 3 Unlike Example 2, the fine-grained minerals have a particle size of less than 10 mm, a first spacing of 11 mm, a second spacing of 11 mm, a first angle of 30°, a second angle of 27°, a third angle of 30°, a first drop of 270 mm, a second drop of 30 mm, a third drop of 300 mm, a fourth drop of 30 mm, a water pressure of 0.5 MPa, and a sedimentation time of 2 hours. The waste rock in the waste rock silo weighs 8,000 tons and has a grade of 0.0013%. The fine-grained minerals in the sedimentation tank weigh 21.1 tons and have a grade of 0.42%. The recovery rate of the fine-grained minerals is calculated to be (21.1 × 0.42%) ÷ (8,000 × 0.0013%) = 85.2%.
[0031] Example 4 Unlike Example 2, the fine-grained minerals have a particle size of less than 8 mm, a first spacing of 10 mm, a second spacing of 10 mm, a first angle of 32°, a second angle of 28°, a third angle of 32°, a first drop of 250 mm, a second drop of 25 mm, a third drop of 270 mm, a fourth drop of 25 mm, a water pressure of 0.4 MPa, and a sedimentation time of 3 hours. The waste rock in the waste rock silo weighs 7,500 tons and has a grade of 0.0013%. The fine-grained minerals in the sedimentation tank weigh 20.7 tons and have a grade of 0.41%. The recovery rate of the fine-grained minerals is calculated to be (20.7 × 0.41%) ÷ (7,500 × 0.0013%) = 87.0%.
[0032] Comparative Example 1 Unlike Example 2, the first spacing is 10mm and the second spacing is 10mm.
[0033] The weight of fine-grained minerals in the sedimentation tank is 18.7 tons, and the grade is 0.45%. The recovery rate of fine-grained minerals is calculated to be (18.7 × 0.45%) ÷ (9000 × 0.0012%) = 77.9%.
[0034] Comparative Example 2 Unlike Example 2, the settling time was 0.3 hours.
[0035] The weight of fine-grained minerals in the sedimentation tank is 22.7 tons, and the grade is 0.4%. The recovery rate of fine-grained minerals is calculated to be (22.7 × 0.4%) ÷ (9000 × 0.0012%) = 84.1%.
[0036] Comparative Example 3 Unlike Example 2, the first spacing is 20mm and the second spacing is 22mm.
[0037] The weight of fine-grained minerals in the sedimentation tank is 46.8 tons, with a grade of 0.21%. The calculated recovery rate of fine-grained minerals is (46.8 × 0.21%) ÷ (9000 × 0.0012%) = 91.0%.
[0038] Comparative Example 4 Unlike Example 2, the second drop is 40mm and the fourth drop is 40mm.
[0039] The weight of fine-grained minerals in the sedimentation tank is 22.8 tons, and the grade is 0.4%. The recovery rate of fine-grained minerals is calculated to be (22.8 × 0.4%) ÷ (9000 × 0.0012%) = 84.4%.
[0040] Comparative Example 5 Unlike Example 2, the first angle is 10°, the second angle is 8°, and the third angle is 10°.
[0041] The weight of fine-grained minerals in the sedimentation tank is 22.7 tons, and the grade is 0.4%. The recovery rate of fine-grained minerals is calculated to be (22.7 × 0.4%) ÷ (9000 × 0.0012%) = 84.1%.
[0042] Comparative Example 6 Unlike Example 2, the first angle is 50°, the second angle is 48°, and the third angle is 50°.
[0043] The weight of fine-grained minerals in the sedimentation tank is 21.3 tons, with a grade of 0.4%. The calculated recovery rate of fine-grained minerals is (21.3 × 0.4%) ÷ (9000 × 0.0012%) = 78.9%.
[0044] Comparative Example 7 Unlike Example 2, the first angle is 30°, the second angle is 20°, and the third angle is 30°.
[0045] The weight of fine-grained minerals in the sedimentation tank is 22.7 tons, and the grade is 0.4%. The recovery rate of fine-grained minerals is calculated to be (22.7 × 0.4%) ÷ (9000 × 0.0012%) = 84.1%.
[0046] Comparative Example 8 Unlike Example 2, the first drop is 50mm and the third drop is 50mm.
[0047] If the elevation difference is too small, it is not suitable to set up a trench.
[0048] Comparative Example 9 Unlike Example 2, the first drop is 600mm and the third drop is 600mm.
[0049] The weight of fine-grained minerals in the sedimentation tank is 22.4 tons, with a grade of 0.4%. The calculated recovery rate of fine-grained minerals is (22.4 × 0.4%) ÷ (9000 × 0.0012%) = 83.0%.
[0050] Comparative Example 10 Unlike Example 2, the second drop is 15mm and the fourth drop is 15mm.
[0051] The weight of fine-grained minerals in the sedimentation tank is 22.2 tons, with a grade of 0.4%. The calculated recovery rate of fine-grained minerals is (22.2 × 0.4%) ÷ (9000 × 0.0012%) = 82.2%.
[0052] This invention, by setting the angle and spacing between ore outlets and multiple nozzle groups, and setting corresponding trenches, can fully recover fine-grained minerals from waste rock from quarrying, improve resource utilization, and has significant economic and social benefits, while being low in cost and easy to maintain.
[0053] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. An apparatus for recovering fine-grained minerals from waste rock from barnyards, characterized in that, include: Waste rock bin, first ore outlet trough, second ore outlet trough, first trench, first nozzle group, second nozzle group, first ore delivery pipe, sedimentation tank; The waste rock bin includes a ore outlet, which is equipped with a gate to control whether ore is discharged from the outlet. The ore outlet is connected to a first ore discharge trough, which is set at a first angle to the horizontal plane. The second ore discharge trough is set at a second angle to the horizontal plane. The first and second ore discharge troughs are spaced apart. The ends of the first and second ore discharge troughs near the second ore discharge troughs are vertically spaced by a first drop. The end of the second ore discharge trough near the first ore discharge trough is provided with a first groove. The ends of the first and second ore discharge troughs near the second ore discharge troughs are horizontally spaced by a first interval and vertically lower than the end of the first and second ore discharge troughs near the second ore discharge troughs, and spaced by a second drop. The first ore delivery pipe connects the first groove and the sedimentation tank, and is used to transport fine-grained minerals in the first groove to the sedimentation tank. The first angle is greater than or equal to 20° and less than or equal to 40°, the first angle is greater than the second angle, and the difference between the first angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the first drop is 100-500mm, the first spacing is 1-3mm larger than the particle size of the fine minerals in the waste rock bin, and the second drop is 25-30mm. The first nozzle group is used to spray water into the waste rock bin, so that the fine minerals in the waste rock bin flow out with the water flow. The second nozzle group is used to spray water into the first ore outlet trough, so that the fine minerals in the first ore outlet trough flow out with the water flow.
2. The apparatus for recovering fine-grained minerals from waste rock as described in claim 1, characterized in that, The device also includes: a third ore outlet trough, a second trench, a second ore delivery pipe, and a third nozzle assembly; The third ore outlet trough is set at a third angle to the horizontal plane. The third ore outlet trough is spaced apart from the second ore outlet trough. The end of the second ore outlet trough near the third ore outlet trough and the end of the third ore outlet trough near the second ore outlet trough are set at a third vertical drop. A second ditch is set at the end of the third ore outlet trough near the second ore outlet trough. The end of the second ditch near the third ore outlet trough and the end of the second ore outlet trough near the third ore outlet trough are set at a second horizontal distance. The second ditch is set at a fourth vertical drop and is lower than the end of the second ore outlet trough near the third ore outlet trough. The second ore delivery pipe connects the second ditch and the sedimentation tank and is used to transport the fine-grained minerals in the second ditch to the sedimentation tank. The third angle is greater than the second angle, the difference between the third angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the third drop is 100-500mm, the second spacing is 1-3mm larger than the particle size of the fine minerals in the waste rock bin, and the fourth drop is 25-30mm. The third nozzle group is used to spray water onto the second ore outlet trough, so that the fine minerals in the second ore outlet trough flow out with the water flow.
3. The apparatus for recovering fine-grained minerals from waste rock from a dumping ground according to claim 2, characterized in that, The angle between the second nozzle group and the first ore outlet trough is the first angle, which is 74°-78°.
4. The apparatus for recovering fine-grained minerals from waste rock from a dumping ground according to claim 3, characterized in that, The angle between the third nozzle group and the second ore outlet is the second angle, which is greater than the first angle. The difference between the second angle and the first angle is greater than or equal to 2° and less than or equal to 5°.
5. The apparatus for recovering fine-grained minerals from waste rock from a dumping ground according to claim 4, characterized in that, The water pressure of the first nozzle group, the second nozzle group, and the third nozzle group is 0.3-0.8 MPa.
6. The apparatus for recovering fine-grained minerals from waste rock from barnyards according to claim 2, characterized in that, The width of the first groove and the second groove is less than or equal to 30 mm, and the bottom is inclined from the center outward with an inclination angle greater than or equal to 3° and less than or equal to 30°.
7. The apparatus for recovering fine-grained minerals from waste rock from a dumping ground according to claim 2, characterized in that, Fine-grained minerals are recovered after settling in the sedimentation tank for 1-3 hours.
8. The apparatus for recovering fine-grained minerals from waste rock from a dumping ground according to claim 2, characterized in that, Also includes: An overflow pool is connected to the sedimentation pool to recover excess water from the sedimentation pool, which can then be recycled after further sedimentation.
9. A method for recovering fine-grained minerals from waste rock from barn construction, comprising the apparatus for recovering fine-grained minerals from waste rock from barn construction as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Detect the particle size of fine minerals in the waste rock bin, and set the first spacing so that fine minerals in the waste rock bin can pass through; S2. Set the first angle, the second angle, the first drop, and the second drop to satisfy the following conditions: the first angle is greater than or equal to 20° and less than or equal to 40°, the first angle is greater than the second angle, and the difference between the first angle and the second angle is greater than or equal to 2° and less than or equal to 5°, the first drop is 100-500mm, and the second drop is 25-30mm. S3. Open the first nozzle group, open the second nozzle group after 5-10 seconds, then open the gate to release ore, and close the gate after the ore release is completed; S4. After the fine minerals enter the sedimentation tank with the water flow, they settle for 1-3 hours to recover the fine minerals.
10. A method for recovering fine-grained minerals from waste rock from a dumping ground according to claim 9, characterized in that, The recovery rate of fine-grained minerals is greater than or equal to 70%.