A system and method for compacting and cementing whole tailings modified body

Abstract

The invention discloses a system and method for compacting and cementing a modified body of full tailings. The system comprises a deep cone thickener, a feeding belt conveyor and a silo; the deep cone thickener is sequentially connected to a variable frequency underflow pump, a concentration meter, a flow meter A and a feeder; the deep cone thickener is also sequentially connected to an overflow pool, a variable frequency water supply pump, a three-way regulating valve and a flow meter B, the three-way regulating valve is also connected to the overflow pool, and the flow meter B is connected to the feeder; the feeding belt conveyor is sequentially connected to a buffer hopper, a continuous metering feeder A and a feeder; the silo is sequentially connected to a continuous metering feeder B, a feeder, a bulk mixer, a transfer belt conveyor and a tailings pond; the system also comprises a roller connected to the tailings pond.

Description

Technical Field

[0001] The invention belongs to the technical field of mining engineering, and in particular relates to a system and method for compacting and cementing a modified whole tailings body. Background Art

[0002] The original grade of metal ores is usually low. The tailings per unit volume of ore after beneficiation are about 2.7-4.0t. The unit volume of underground filling mining generally consumes 1.2-1.3t of tailings. There is still a large amount of tailings that need to be discharged and stored in the tailings pond. The tailings slurry of the beneficiation plant has the characteristics of "large quantity, fine particles and low concentration". It is mainly discharged to the tailings pond by two traditional methods: tailings filter press or pipeline pumping tailings slurry. With the advancement of mineral processing technology, the grinding particle size is getting finer and finer, and the tailings filter press is more difficult. The traditional method of discharging tailings leads to a high moisture content of the tailings in the reservoir, and the drainage pressure of the tailings pond is relatively large. In addition, the stored tailings have the phenomenon of "secondary slurry activation" under rainfall conditions, which is also one of the important factors affecting the safety of the tailings pond. In addition, due to the natural geographical conditions of the mining area, it is very difficult to select a site for a new tailings pond. The mine faces the contradiction between expanding production capacity and limited tailings pond capacity. Therefore, the problem of safely and effectively improving the utilization rate of the existing tailings pond needs to be solved urgently. Summary of the invention

[0003] The present invention aims to overcome the shortcomings of high water content and potential safety hazards in traditional tailings pond sand discharge methods, and provides a system and method for compacting and cementing a modified tailings body.

[0004] In order to achieve the above object, the technical solution provided by the present invention is:

[0005] The whole tailings modified body compaction cementation storage system comprises a deep cone thickener (1), a feeding belt conveyor (9) and a silo (12); the deep cone thickener (1) is connected to a variable frequency underflow pump (2), the variable frequency underflow pump (2) is connected to a concentration meter (3), the concentration meter (3) is connected to an A flow meter (4), the A flow meter (4) is connected to a feeder (14); the deep cone thickener (1) is also connected to an overflow pool (5), the overflow pool (5) is connected to a variable frequency water supply pump (6), the variable frequency water supply pump (6) is connected to a three-way regulating valve (7), the three-way regulating valve (7) is connected to a B flow meter (8), the three-way regulating valve (7) is also connected to the overflow pool (5), the B flow meter (8) is connected to a feeder (14); the feeding belt conveyor (9) is connected to a buffer hopper (10), the buffer hopper (10) is connected to a continuous metering feeder A (11), and the continuous metering feeder A (11) is connected to the feeder (14); the silo (12) is connected to a continuous metering feeder B (13), and the continuous metering feeder B (13) is connected to the feeder (14); the feeder (14) is connected to a bulk mixer (15), the bulk mixer (15) is connected to a transfer belt conveyor (16), and the transfer belt conveyor (16) is connected to a tailings pond (19); the full tailings modified body compaction and cementation storage system also includes a roller compactor (18) connected to the tailings pond (19).

[0006] Preferably, the variable frequency water pump (6) can be a horizontal centrifugal pump, a vertical centrifugal pump or a pipeline pump (with a remote control interface); the A continuous metering feeder (11) can be a variable frequency motor speed-adjusting belt metering or a reducer stepless speed-adjusting belt metering (with a remote control interface); the B continuous metering feeder (13) can be a variable frequency variable pitch metering or a variable frequency equal pitch metering (with a remote control interface); the bulk mixer (15) can be a single-stage continuous mixer or a two-stage continuous mixer (with a remote control interface); the roller (18) can be a crawler roller or a wheel roller. The discharge end of the three-way regulating valve (7) is an electric regulating valve (with a remote control interface). The indicators of the deep cone thickener are: the diameter range is 10-40m, and the mass concentration of the thickening bottom flow is greater than 70%.

[0007] Preferably, the feeder (14) is provided with a waste rock channel, a binder channel, a water channel and a material curtain pool (the water channel is output through the material curtain pool).

[0008] The entire tailings modified body compaction cementation storage system can be controlled by a control system (17) connected thereto.

[0009] The whole tailings modified body compaction and cementation storage method based on the above-mentioned whole tailings modified body compaction and cementation storage system includes the following processes: the whole tailings slurry of the concentrator enters the deep cone thickener, and after the whole tailings is thickened to a paste state, it enters the feeder through a variable frequency underflow pump via a pipeline equipped with a concentration meter and a flow meter A in sequence; the waste rock of the concentrator is transported to the buffer hopper through a feeding belt conveyor, and continuously enters the feeder after being metered by a continuous metering feeder A; the cementing material is stored in a silo, and continuously enters the feeder after being metered by a continuous metering feeder B; and the clarified overflow water in the deep cone thickener enters the overflow pool, and is supplied to the feeder through a variable frequency water supply pump via a pipeline equipped with a three-way conditional valve and a flow meter in sequence; the material in the feeder enters the bulk mixer and is mixed into a finished bulk, and the finished bulk is discharged into the transfer belt conveyor and transported to the tailings pond for storage and is rolled while being stored by a roller.

[0010] Preferably, the whole tailings slurry, waste rock, binder and water supply of the dressing plant are calculated according to the following algorithm:

[0011] Dry tail dosage per unit volume Waste rock consumption per unit volume Amount of binder per unit volume Water supply per unit volume

[0012] Among them, C w -Minimum moisture content of modified product, %; k cs - dry basis lime-sand ratio; k sg -Dry basis sand-gravel ratio, m; W g -Moisture content of waste rock, %; γ s -True density of dry tail, t / m 3 ; γ g -True density of waste rock on dry basis, t / m 3 ; γ w -True density of water, t / m 3 ; γ c -True density of binder, t / m 3 .

[0013] Preferably, in the whole tailings slurry of the concentrator, the proportion of sand with a particle size of -150 μm is greater than 70%, the proportion of sand with a particle size of -75 μm is greater than 60%, and the proportion of sand with a particle size of -37 μm is greater than 30%, and the percentages are mass percentages; the concentrator waste rock is waste rock with a maximum particle size of <50 mm.

[0014] Preferably, the binder is cement and / or cement powder.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The whole tailings of the concentrator are thickened by deep cone thickener 1, which can realize one-step paste formation. The process is short, the processing capacity is large, and the reliability is high. It not only avoids the complicated process of tailings classification and dehydration, but also meets the development trend of smaller and smaller grinding fineness of the concentrator, and eliminates the adaptability problem of traditional filter press dehydration to tailings.

[0017] 2. Use the waste rock from the dressing plant and the binder to modify the tailings slurry for the second time. By adjusting the formula, the moisture content of the modified stockpile before compaction and solidification can be much lower than that of the traditional stockpile. The stockpile modified stockpile after compaction and solidification condenses and solidifies the water, converting the free water into solidified structural water, which fundamentally eliminates the potential hidden dangers of moisture content. In addition, the modified stockpile after solidification is not affected by rainfall, eliminating the disadvantages of secondary slurry activation.

[0018] 3. The tailings slurry is modified and compounded for the second time using waste rock from the dressing plant and binder. The amount of binder can be adjusted according to the stockpile height to achieve mixed stockpile of various strengths. It has economic adjustability, eliminates the disadvantages of uncontrolled stockpile strength and limited stockpile height in traditional stockpile methods, and expands the scope of application of tailings stockpile.

[0019] 4. The modified equipment adopts a continuous batching process. Compared with the traditional batch intermittent filter press equipment, it has the characteristics of less equipment, low energy consumption and high efficiency.

[0020] 5. The material dosage of the system is controlled according to the formula algorithm. The system equipment adopts a short process layout, which can adjust the bottom flow fluctuation of the deep cone thickener dynamically, respond promptly, ensure the quality of the modified body, and be safe and reliable.

[0021] 6. The modified stockpile is compacted by a roller, which can utilize the existing conventional crawler bulldozers and wheel rollers in the mine, without the need for additional equipment.

[0022] The present invention overcomes the drawbacks of the traditional tailings pond sand discharge method. By adding a small amount of plant waste rock and cementing material to the dense underflow of the whole tailings, the whole tailings slurry is modified and compounded into a bulk body through stirring, thereby improving the transportation performance. After the bulk body is rolled and solidified in the tailings pond, the bulk body is modified and compounded into a fully cemented solid body, thereby improving the stability and the safety of the tailings pond storage.

[0023] In summary, the present invention provides a system and method for compacting and cementing modified tailings. The system uses whole tailings to thicken into a paste, adds waste rock from the dressing plant and cementing material for secondary composite modification, and forms a bulk body that is easy to transport and store. After compaction and solidification, it becomes a complete solid, which solves the residual water impact of traditional filter press storage or mortar pumping storage, and can achieve minimum water content transportation and safe storage of solidified structural water. The use of continuous equipment and processes reduces the number of systems and equipment, reduces system energy consumption and investment, and improves system efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the whole tailings modified body compaction cementation storage system of the present invention.

[0025] In the figure: 1. Deep cone thickener; 2. Variable frequency underflow pump; 3. Concentrator; 4. Flow meter A; 5. Overflow pool; 6. Variable frequency water pump; 7. Three-way regulating valve; 8. Flow meter B; 9. Feeding belt conveyor; 10. Buffer hopper; 11. Continuous metering feeder A; 12. Silo; 13. Continuous metering feeder B; 14. Feeder; 15. Bulk mixer; 16. Transfer belt conveyor; 17. Control system; 18. Rolling machine; 19. Tailings pond. DETAILED DESCRIPTION

[0026] Example 1

[0027] See also Figure 1 The whole tailings modified body compaction cementation storage system includes a deep cone thickener 1, a feeding belt conveyor 9 and a silo 12; the deep cone thickener 1 is connected to a variable frequency underflow pump 2, the variable frequency underflow pump 2 is connected to a concentration meter 3, the concentration meter 3 is connected to an A flow meter 4, the A flow meter 4 is connected to a feeder 14; the deep cone thickener 1 is also connected to an overflow pool 5, the overflow pool 5 is connected to a variable frequency water supply pump 6, the variable frequency water supply pump 6 is connected to a three-way regulating valve 7, the three-way regulating valve 7 is connected to a B flow meter 8, the three-way regulating valve 7 is also connected to the overflow pool 5, the B flow meter 8 It is connected to the feeder 14; the feeding belt conveyor 9 is connected to the buffer bucket 10, the buffer bucket 10 is connected to the A continuous metering feeder 11, and the A continuous metering feeder 11 is connected to the feeder 14; the silo 12 is connected to the B continuous metering feeder 13, and the B continuous metering feeder 13 is connected to the feeder 14; the feeder 14 is connected to the bulk mixer 15, the bulk mixer 15 is connected to the transfer belt conveyor 16, and the transfer belt conveyor 16 is connected to the tailings pond 19; the full tailings modified body compaction and cementation storage system also includes a roller 18 connected to the tailings pond 19.

[0028] Among them, the variable frequency water pump 6 can be a horizontal centrifugal pump, a vertical centrifugal pump or a pipeline pump (with a remote control interface); the A continuous metering feeder 11 can adopt a variable frequency motor speed-adjusting belt metering method or a reducer stepless speed-adjusting belt metering method (with a remote control interface); the B continuous metering feeder 13 can adopt a variable frequency variable pitch metering method or a variable frequency equal pitch metering method (with a remote control interface); the bulk mixer 15 can adopt a single-stage continuous mixer or a two-stage continuous mixer (with a remote control interface); the roller 18 can adopt a crawler roller or a wheel roller. The discharge end of the three-way regulating valve 7) is an electric regulating valve (with a remote control interface). The indicators of the deep cone thickener are: the diameter range is 10-40m, and the mass concentration of the thickening bottom flow is greater than 70%. The feeder 14 is provided with a waste rock channel, a cementing material channel, a water channel and a material curtain pool (the water channel is output through the material curtain pool).

[0029] The entire tailings modified body compaction and cementation storage system can be controlled by a control system 17 electrically connected thereto.

[0030] Example 2

[0031] The whole tailings modified body compaction and cementation storage method based on the whole tailings modified body compaction and cementation storage system described in Example 1 includes the following processes: the whole tailings slurry of the concentrator enters the deep cone thickener, and after the whole tailings is thickened to a paste state, it enters the feeder through a variable frequency underflow pump via a pipeline equipped with a concentration meter and a flow meter A in sequence; the waste rock of the concentrator is transported to the buffer hopper through a feeding belt conveyor, and continuously enters the feeder after being metered by a continuous metering feeder A; the cementing material is stored in a silo, and continuously enters the feeder after being metered by a continuous metering feeder B; the clarified overflow water in the deep cone thickener enters the overflow pool, and is supplied to the feeder through a variable frequency water supply pump via a pipeline equipped with a three-way conditional valve and a flow meter in sequence; the material in the feeder enters the bulk mixer and is mixed into a finished bulk, and the finished bulk is discharged into a transfer belt conveyor and transported to the tailings pond for storage and is rolled while being stored by a roller.

[0032] The total tailings mortar, waste rock, binder and water supply of the dressing plant are calculated according to the following algorithm:

[0033] Dry tail dosage per unit volume Waste rock consumption per unit volume Amount of binder per unit volume Water supply per unit volume

[0034] Among them, C w -Minimum moisture content of modified product, %; k cs - dry basis lime-sand ratio; k sg -Dry basis sand-gravel ratio, m; W g -Moisture content of waste rock, %; γ s-True density of dry tail, t / m 3 ; γ g -True density of waste rock on dry basis, t / m 3 ; γ w -True density of water, t / m 3 ; γ c -True density of binder, t / m 3 .

[0035] In the whole tailings slurry of the concentrator, the sand with a particle size of -150 μm accounts for more than 70%, the sand with a particle size of -75 μm accounts for more than 60%, and the sand with a particle size of -37 μm accounts for more than 30%, and the percentages are mass percentages; the waste rock of the concentrator is waste rock with a maximum particle size of <50 mm.

[0036] The binder is cement and / or cement powder.

Claims

1. A method for compacting and cementing a modified whole tailings body, characterized in that: The method is implemented in the following full tailings modified body compaction and cementation storage system: the full tailings modified body compaction and cementation storage system comprises a deep cone thickener (1), a feeding belt conveyor (9) and a silo (12); the deep cone thickener (1) is connected to a variable frequency underflow pump (2), the variable frequency underflow pump (2) is connected to a concentration meter (3), the concentration meter (3) is connected to an A flow meter (4), the A flow meter (4) is connected to a feeder (14); the deep cone thickener (1) is also connected to an overflow pool (5), the overflow pool (5) is connected to a variable frequency water supply pump (6), the variable frequency water supply pump (6) is connected to a three-way regulating valve (7), the three-way regulating valve (7) is connected to a B flow meter (8), the three-way regulating valve (7) is also connected to an overflow water tank (5), the overflow water tank (5) is connected to a variable frequency water supply pump (6), the variable frequency water supply pump (6) is connected to a three-way regulating valve (7), the three-way regulating valve (7) is connected to a B flow meter (8), the three-way regulating valve (7) is also connected to an overflow water tank (5), The A-type feeder (14) is connected to the A-type feeder (5), the B-type flowmeter (8) is connected to the feeder (14); the feeding belt conveyor (9) is connected to the buffer bucket (10), the buffer bucket (10) is connected to the A-type continuous metering feeder (11), the A-type continuous metering feeder (11) is connected to the feeder (14); the silo (12) is connected to the B-type continuous metering feeder (13), the B-type continuous metering feeder (13) is connected to the feeder (14); the feeder (14) is connected to the bulk mixer (15), the bulk mixer (15) is connected to the transfer belt conveyor (16), the transfer belt conveyor (16) is connected to the tailings pond (19); the whole tailings modified body compaction and cementation storage system also includes a roller (18) connected to the tailings pond (19); The method comprises the following processes: the whole tailings slurry of the concentrator enters the deep cone thickener, and after the whole tailings are thickened to a paste state, they enter the feeder through a variable frequency underflow pump via a pipeline provided with a concentration meter and a flow meter A in sequence; the waste rock of the concentrator is transported to the buffer hopper through a feeding belt conveyor, and continuously enters the feeder after being metered by a continuous metering feeder A; the binder is stored in a silo, and continuously enters the feeder after being metered by a continuous metering feeder B; the clarified overflow water in the deep cone thickener enters the overflow pool, and is fed to the feeder through a variable frequency water supply pump via a pipeline provided with a three-way conditional valve and a flow meter in sequence; the material in the feeder enters the bulk mixer and is mixed into a finished bulk, and the finished bulk is discharged and transported to the tailings pond by a transfer belt conveyor for storage, and is rolled while being stored by a roller; the whole tailings slurry of the concentrator, the waste rock of the concentrator, the binder and the water supply are calculated according to the following algorithm: Dry tail dosage per unit volume Waste rock consumption per unit volume Amount of binder per unit volume Water supply per unit volume Among them, C w -Minimum moisture content of modified product, %; k cs - lime-sand ratio on dry basis; k sg -Dry basis sand-gravel ratio, m; W g -Moisture content of waste rock, %; γ s -True density of dry tail, t / m 3 ; γ g -True density of waste rock on dry basis, t / m 3 ; γ w -True density of water, t / m 3 ; γ c -True density of binder, t / m 3 .

2. The method for compacting and cementing the modified whole tailings according to claim 1, characterized in that: The binder is cement and / or cement powder.

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