A low-cost, high-performance fine-grained slurry concentration system and control method thereof

Abstract

The present invention provides a low-cost, high-performance fine-grained slurry concentration system and a control method thereof, wherein at least two compression pipes with a height of 20 to 50 meters are connected to the lower end of the concentration cone. The material distribution device includes a central tube, a spiral feeder arranged around the central tube, and a central feeder connected to a central feed pipe at the upper end and with a lower port located directly above the central tube. The material distribution device also includes a tangential feeder pipe that runs tangentially to the annular flow channel of the spiral feeder and whose inner end is connected to the annular flow channel. The use of the system and control method of the present invention can greatly optimize the solid-liquid separation effect of fine-grained tailings, save infrastructure investment, reduce operation and maintenance costs, and provide more favorable conditions for subsequent operations.

Description

Technical Field

[0001] The present invention relates to a pulp concentration system and a concentration control method. The fine-grained pulp refers to a pulp with a particle size of -200 mesh. Background Art

[0002] In mining production, low-concentration slurry needs to be concentrated into high-concentration slurry in operations such as ore dressing and underground filling to meet the requirements of the next process. Traditional slurry concentration devices are generally unpowered deep cone thickeners, whose main parts are made of rolled and welded steel plates, which have the problems of high engineering costs and long manufacturing cycles. On the other hand, using thickeners to concentrate slurry has limited improvement in slurry concentration.

[0003] For example, a mine adopts the backfill mining method. The tailings output of the concentrator is 1,000 tons / day, the tailings true density is 3.0, and the output particle size of -200 mesh accounts for 65-70%. Among them, about 500 tons / day of +400 mesh coarse-grained tailings are all used for underground backfilling, and about 500 tons / day of -400 mesh fine-grained tailings are discharged to the tailings pond for storage. In terms of fine-grained tailings backfilling, because conventional technology can only increase the fine-grained tailings slurry concentration to 62±2%, it needs to be mixed with cementitious materials and then filled into the underground. The backfilling body solidifies slowly and has low strength. In order to ensure the slurry concentration, the pipeline flushing water needs to be strictly controlled, the production efficiency is low, the operation is difficult, and the fault tolerance rate is low. In view of the above reasons, fine-grained tailings backfilling is difficult to implement, and the tailings pond storage capacity is in urgent need.

[0004] For example, a mine adopts the backfill mining method. The tailings output of the concentrator is 1,500 tons / day, the tailings true density is 2.6, and the output particle size of -200 mesh accounts for 50-55%. Among them, about 1,000 tons / day of coarse-grained tailings are all used for underground backfilling, and about 500 tons / day of -400 mesh fine-grained tailings are transported to the brick factory by car after two-stage dehydration. Among them, the first stage of dehydration uses a high-efficiency thickener, and the flocculant addition amount is 20 grams / ton. The fine tailings slurry concentration can be increased from 25% to 45%. After the second stage of dehydration using a plate and frame filter press, the filter cake can meet the needs of automobile transportation.

[0005] Therefore, using the existing thickener to concentrate fine-grained slurry usually requires further processing to reach the concentration requirements for filling or transportation, otherwise it will greatly affect the quality and efficiency of underground filling operations and it will be difficult to meet the concentration requirements for transportation. The use of additional concentration measures such as further filtration and dehydration will greatly increase the construction cost and significantly reduce the construction efficiency. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a low-cost, high-performance fine-particle slurry concentration system and a control method thereof. First, the solid content of the underflow slurry is greatly increased through ultra-high pressure compression, creating conditions for subsequent efficient and high-quality filling or transportation operations; second, the system investment cost is further reduced to achieve low-cost and efficient operation of slurry concentration.

[0007] The technical solution of the present invention is as follows:

[0008] A low-cost, high-performance fine-grained slurry thickening system comprises a thickening cone and a settling cylinder connected to the upper end of the thickening cone, an overflow trough is arranged at the upper end of the settling cylinder, and at least two compression pipes are connected to the lower end of the thickening cone; the compression pipe is 20 to 50 meters high; the lower end of the compression pipe is connected to a discharge pipe; the thickening system also comprises a distribution device, the distribution device comprises a central tube, a spiral feeder arranged at the periphery of the central tube, and a central distributor connected to a central feeding pipe at the upper end and with a lower port located directly above the central tube; the spiral feeder is an annular flow channel opening upward, the annular flow channel has an annular bottom plate, an outer wall plate connected to the outer side edge of the annular bottom plate and an inner wall plate connected to the inner side edge of the annular bottom plate; the distribution device also comprises a tangential feeding pipe which runs tangentially to the annular flow channel and whose inner end is connected to the annular flow channel; the height of the outer wall plate is greater than that of the inner wall plate.

[0009] Preferably, the concentration cone, the settling cylinder and the overflow tank are all made of galvanized canvas.

[0010] Preferably, the compression tube height L is determined by the following formula:

[0011] ;

[0012] Where L is the height of the compression tube, m; C w —Mass concentration of ore slurry in the compression tube bottom flow, %; ρ0—True specific gravity of ore.

[0013] Preferably, the compression pipe is connected with a defoaming agent feeding pipe and a water reducing agent feeding pipe.

[0014] Based on the control method of the concentration system, 1-10 g / ton of slurry defoamer is added through the defoamer feeding pipe; 1-8 g / ton of slurry water reducer is added through the water reducer feeding pipe.

[0015] Preferably, the lower end of the compression tube is connected with an air inlet pipe for receiving high-pressure gas and a water inlet pipe for receiving cleaning water.

[0016] Based on the control method of the enrichment system, the feed pressure P of the high-pressure gas connected through the intake pipe is determined according to the following formula:

[0017] ;

[0018] Where P is the high-pressure air or high-pressure water supply pressure, MPa; K is the safety correction factor, generally 1.2-1.5; C is the average mass concentration of the slurry, %;

[0019] in, ;

[0020] Where C0 is the initial feed slurry mass concentration, %; C w —mass concentration of slurry in the bottom flow of the compression tube, %; g—gravity coefficient, take 9.8N / kg; ρ0—true specific gravity of ore; ρ—true specific gravity of clean water, take 1.0; h—the sum of the heights of the sedimentation tube, concentrating cone and compression tube, m.

[0021] Compared with the prior art, the present invention has the following effects:

[0022] (1) After the slurry enters the concentration system, it forms a clarification zone, a sedimentation zone, a transition zone and a compression zone from top to bottom. The slurry concentration gradually increases from top to bottom, and finally forms a paste or a paste-like substance under the action of ultra-high pressure compression, which greatly optimizes the solid-liquid separation effect and increases the bottom flow concentration by more than 20% compared with conventional technology.

[0023] (2) Slurry dehydration generally adopts two-stage dehydration of concentration + filtration to meet the requirements of vehicle loading and unloading and transportation. The high-concentration paste produced by the system of the present invention can be directly mixed with the gelling material for underground filling; if it needs to be transported by car, the high-concentration paste can be pressed into the filter press by the plunger pump, and the cycle time of the filtration operation can be reduced from about 50 minutes to about 15 minutes.

[0024] (3) The sedimentation cylinder, concentration cone, and overflow tank of the concentration system are all made of galvanized canvas. Compared with conventional technology, the production cost can be reduced to about 10% of the original, achieving substantial cost reduction and efficiency improvement. At the same time, due to its light weight, low cost and easy installation, the volume of the sedimentation cylinder can be easily expanded according to the production scale.

[0025] (4) The optimized technical solution of the present invention introduces a defoaming agent, which reduces the surface tension of mineral particles, causing bubbles to quickly burst and escape in the mineral particle group, and can inhibit the generation of bubbles, thereby avoiding excessive bubbles and pores in the compression zone, further improving the compression efficiency of the compression zone and the solid content after compression.

[0026] (5) The optimized technical solution of the present invention introduces a water reducer. After adding an appropriate amount of water reducer, its hydrophobic groups are directional adsorbed on the surface of mineral particles and make them carry the same charge. Under the action of electrical repulsion, the mineral particles repel each other, the flocculation structure disintegrates, and the free water closed in it is released, which effectively increases the solid content of the compression zone and the fluidity of the paste (paste-like). On the other hand, the hydrophilic groups of the water reducer molecules are directional arranged toward the aqueous solution. Its polarity is very strong and it is easy to combine with water molecules in the form of hydrogen bonds, forming a layer of stable solvated water film on the surface of mineral particles, which is more conducive to the sliding of mineral particles. In detail: ① Dispersion effect: After adding the water reducer, since the water reducer molecules can be directional adsorbed on the surface of mineral particles, the surface of mineral particles carries the same charge, forming an electrostatic repulsion effect, prompting the mineral particles to disperse with each other, the flocculation structure disintegrates, and the enclosed part of the water is released, the solid content is increased, and the fluidity is effectively increased. ② Lubricating effect: The hydrophilic group in the water reducer is very polar, so the water reducer adsorption film on the surface of the mineral particles can form a stable solvated water film with water molecules. This water film has a good lubricating effect and can effectively reduce the sliding resistance between mineral particles, thereby further improving the fluidity of the paste.

[0027] (6) High-pressure gas is introduced into the optimized technical solution of the present invention. First, the amount of high-pressure gas used is very small, as long as the mineral particles in the compression zone are not blocked, there will not be much disturbance; at the same time, during the working process, large bubbles are continuously discharged, and small bubbles are difficult to form and easy to break due to the addition of defoaming agent. Therefore, high-pressure gas will basically not affect the sedimentation and concentration of mineral particles while ensuring smooth discharge.

[0028] (7) In the system of the present invention, the final required underflow concentration can be obtained by adjusting the height of the compression pipe. In the technical scheme of the control method of the present invention, by calculating the amount of defoamer and water reducer added, quantitative control of indicators such as compression efficiency, solid content after compression, and fluidity of slurry after compression is achieved. By calculating the feed pressure of high-pressure gas, the feed pressure can be controlled within a reasonable range, and a balance can be found between smooth discharge and basically not affecting the sedimentation and concentration of mineral particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a fine-grained slurry concentration system of the present invention;

[0030] Figure 2 It is a schematic diagram of the top view of the structure of an embodiment of a fine-grained slurry concentration system of the present invention;

[0031] Figure 3 It is a schematic diagram of the top view of the structure of the material distribution device in the embodiment of the fine-grained slurry concentration system of the present invention;

[0032] Figure 4It is a side structural schematic diagram of the material distribution device in the embodiment of the fine-grained slurry concentration system of the present invention.

[0033] Description of reference numerals:

[0034] 1. Concentration cone; 2. Sedimentation cylinder; 3. Distribution device; 3-1. Central feeding pipe; 3-2. Central distributor; 3-3. Screw feeder; 3-3-1. Inner wall plate; 3-3-2. Outer wall plate; 3-3-3. Annular bottom plate; 3-4. Tangential feeding pipe; 3-5. Central cylinder; 4. Overflow trough; 5. Overflow pipe; 6. Defoamer feeding pipe; 7. Water reducing agent feeding pipe; 8. Compression pipe; 9. Air inlet pipe; 10. Water inlet pipe; 11. Discharge pipe; 12. Discharge valve. DETAILED DESCRIPTION

[0035] In order to make those skilled in the art better understand, the present invention is further described below in conjunction with the embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work should belong to the scope of protection of the present invention.

[0036] like Figure 1 and Figure 2 The fine-grained slurry concentration system of the present invention comprises a concentration cone 1, a settling drum 2 connected to the upper end of the concentration cone 1, and at least two compression pipes 8 connected to the lower end of the concentration cone 1. The upper end of the settling drum 2 is provided with an overflow trough 4 connected to an overflow pipe 5. This embodiment also includes a material distribution device 3. Figure 3 and Figure 4 The material distribution device 3 includes a central cylinder 3-5, a screw feeder 3-3 arranged around the central cylinder 3-5, and a central distributor 3-2 with a central feeding pipe 3-1 connected to the upper end and a lower port located just above the central cylinder 3-5. The sedimentation cylinder 2 is made of galvanized canvas and is in the shape of a cylinder with both upper and lower ends open. The overflow trough 4 is made of galvanized canvas and is located outside the top of the sedimentation cylinder. The lower end of the compression pipe 8 is connected to a discharge pipe 11 through a discharge valve 12.

[0037] The concentrating cone 1 is made of galvanized canvas and is in an inverted cone shape, and the cone angle is generally 60°. The compression pipe 8 is made of a seamless steel pipe, with a pipe diameter of 500 mm, 2-4 pipes (two pipes in this embodiment), and a height of 20-50 meters.

[0038] The screw feeder 3-3 is an annular flow channel opening upward, and the annular flow channel has an annular bottom plate 3-3-3, an outer wall plate 3-3-2 connected to the outer side of the annular bottom plate 3-3-3, and an inner wall plate 3-3-1 connected to the inner side of the annular bottom plate 3-3-3. The material distribution device 3 also includes two tangential feeding pipes 3-4 that are tangential to the annular flow channel and whose inner ends are connected to the annular flow channel. The height of the outer wall plate 3-3-2 is greater than that of the inner wall plate 3-3-1.

[0039] When in use, the slurry enters the slurry concentration system in two parts. One part is fed into the screw feeder 3-3 from the periphery along the tangential direction through the tangential feeding pipe 3-4, and overflows from the top of the inner wall plate 3-3-1 and enters and is distributed in the peripheral area of ​​the settling tube 2. The other part is evenly fed to the central tube 3-5 through the central feeding pipe 3-1 and the central distributor 3-2, and enters and is distributed in the central area of ​​the settling tube 2. The above-mentioned distribution method realizes the uniform distribution of slurry in the settling tube 2, which is conducive to subsequent sedimentation and concentration. At the same time, it can effectively reduce the initial velocity of slurry feeding, reduce the disturbance of the sedimentation layer by the newly entered slurry, and further improve the sedimentation effect. After the slurry enters the concentration system, the ore particles sink into the concentration area by their own weight, and the clean water rises and is discharged from the overflow trough 4 and the overflow pipe 5. The area of ​​the settling tube 2 determines the processing capacity of the slurry concentration system, and its size can be selected according to demand.

[0040] After the slurry enters the concentration zone, a dense phase sedimentation layer is formed, and the concentration continues to increase. At the same time, with the help of the conical diversion effect of the concentration cone 1, the slurry with higher concentration is collected and enters the compression pipe 8.

[0041] After the high-concentration slurry enters the compression pipe 8, the squeezing force between the mineral particles continues to increase due to the upper head pressure, the gap becomes smaller, and the solid-liquid separation effect continues to strengthen. Finally, a paste or paste-like substance is formed and discharged through the discharge pipe 11 to provide material for the next process (filling or filter pressing, etc.).

[0042] Furthermore, since the height of the compression tube 8 determines the final underflow concentration, in order to control the underflow concentration, the compression tube height L is determined by the following formula 1 in this embodiment:

[0043] Formula 1: ;

[0044] Where L is the height of the compression tube, m; C w —Mass concentration of ore slurry in the compression tube bottom flow, %; ρ0—True specific gravity of ore.

[0045] Note: Formula 1 is applicable to specific numerical calculations within the range of 20-50 meters for compression pipe height.

[0046] Furthermore, the upper end of the compression pipe 8 is connected with a defoamer feeding pipe 6 and a water reducing agent feeding pipe 7. If necessary, defoamer is added through the defoamer feeding pipe 6, and water reducing agent is added through the water reducing agent feeding pipe 7. The amount of defoamer added is 1-10 g / ton of ore pulp, and the amount of water reducing agent added is 1-8 g / ton of ore pulp.

[0047] Furthermore, the lower end of the compression pipe 8 is connected with an air inlet pipe 9 and a water inlet pipe 10. The air inlet pipe 9 is used to connect high-pressure gas to ensure that the compression pipe 8 is not blocked by mineral particles to prevent the compression pipe 8 from being blocked. The water inlet pipe 10 is closed during normal working hours, and water is introduced to clean the compression pipe 8 when the machine is shut down for cleaning.

[0048] Furthermore, the feed pressure P of the high-pressure gas introduced through the intake pipe 9 is determined according to the following formula 2:

[0049] Formula 2: ;

[0050] Where P is the high-pressure air or high-pressure water supply pressure, MPa; K is the safety correction factor, generally 1.2-1.5; C is the average mass concentration of the slurry, %;

[0051] in, ;

[0052] Where C0 is the initial feed slurry mass concentration, %; C w —mass concentration of slurry in the bottom flow of the compression tube, %; g—gravity coefficient, take 9.8N / kg; ρ0—true specific gravity of ore; ρ—true specific gravity of clean water, take 1.0; h—the sum of the heights of the sedimentation tube, concentrating cone and compression tube, m.

[0053] In order to obtain the highest possible underflow slurry concentration, the system requires a high compression pipe (20-50m). In view of this, the most reasonable construction method for the system is to build it against the mountain and use the height difference of the mountain to provide construction space. It is also possible to use abandoned and idle shafts to place compression pipes, and build the thickening system on flat ground. This method is most suitable for underground filling slurry.

[0054] At the production site, an operating platform made of H-shaped steel and steel grating is generally installed on the top of the concentration device, which is used as an inspection channel for operators and a platform for daily observation of overflow water quality. The central cylinder 3-5, central distributor 3-2 and screw feeder 3-3 in this embodiment are generally connected and fixed to the H-shaped steel or steel grating through a bracket mechanism.

[0055] The control method of the present invention mainly includes the control of the addition amount of the defoaming agent and the water reducing agent and the feeding pressure of the high-pressure gas. The specific control method has been described above.

[0056] The specific control method and actual technical effect of the system of the present invention are explained below through field examples.

[0057] Field Example 1

[0058] A mine adopts the backfill mining method. The tailings output of the concentrator is 1,000 tons / day, the tailings true density is 3.0, and the output particle size of -200 mesh accounts for 65-70%. Among them, about 500 tons / day of +400 mesh coarse-grained tailings are all used for underground backfilling, and about 500 tons / day of -400 mesh fine-grained tailings are discharged to the tailings pond for storage. In terms of fine-grained tailings backfilling, because conventional technology can only increase the fine-grained tailings slurry concentration to 62±2%, it is mixed with cementitious materials and then filled into the underground. The backfilling body solidifies slowly and has low strength. In order to ensure the slurry concentration, the pipeline flushing water needs to be strictly controlled, the production operation is difficult, and the fault tolerance rate is low. In view of the above reasons, fine-grained tailings backfilling is difficult to implement, and the tailings pond storage capacity is in urgent need.

[0059] In view of the above situation, the mine adopts the fine-grained slurry concentration system and control method of the present invention under confidentiality conditions. The specific parameters are as follows: the diameter of the settling tube 2 is 18m and the height is 2m; the angle of the concentration cone 1 is 60° and the height is 14.5m; the compression pipe 8 uses two φ530×12mm seamless steel pipes. The height of the compression pipe 8 is calculated as follows, and the result is about 35m:

[0060] formula: ;

[0061] Where L is the height of the compression tube, m; C w —The mass concentration of the ore slurry in the compression tube bottom flow is taken as 72%; ρ0—the true specific gravity of the ore is taken as 3.0.

[0062] Then L=2.7×72 / 3.0-30=34.8≈35m.

[0063] The high pressure air supply pressure at the bottom of the compression pipe 8 is calculated as follows, and the result is about 6.6Mpa:

[0064] formula ;

[0065] Where P is the high-pressure air or high-pressure water supply pressure, MPa; K is the safety correction factor, which is 1.3; C is the average mass concentration of the slurry, %;

[0066] , is 48.5%; C0—initial feed slurry mass concentration, 25%; C w —Mass concentration of ore pulp in the bottom flow of the compression tube, 72%; g—gravity coefficient, 9.8N / kg; ρ0—true specific gravity of ore, 3.0; ρ—true specific gravity of clean water, 1.0; h—sum of the heights of the sedimentation tube, concentrating cone and compression tube, 51.5m.

[0067] Then there is .

[0068] The main parts such as the settling cylinder 2, the concentration cone 1, and the overflow tank 4 are all made of galvanized canvas. The total height of the concentration system is 51.5m. The mine is located in a plain area, the settling cylinder 2 and the concentration cone 1 are on the surface, and the compression pipe 8 and the discharge pipe 11 are underground using an idle shaft.

[0069] After the system is put into use, the tailings of the ore dressing plant are first classified, and the coarse sand is dehydrated and stored for export; the fine sand slurry enters the concentration system. After sedimentation, concentration and compression, the bottom flow discharge concentration reaches 72±2%, which is 10% higher than the conventional technology. When the filling slurry is kept at a high concentration, by adding a certain amount of defoamer (dosage 6g / t) and water reducer (dosage 3g / t), the slump can be easily controlled at 28 / 30, and the fluidity and workability are greatly increased. The high concentration will bring about the early strength of the filling body and the saving of cementitious materials. While meeting the production quality requirements, it is conducive to the realization of the fool-proof operation of filling and the real one-key filling, and the fault tolerance rate is greatly improved, avoiding too much human participation and mistakes that lead to the failure of fine-grained filling, and expanding the effective application of fine-grained tailings filling.

[0070] According to the market situation, the conventional technology was used to build a new 18m non-powered deep cone thickener, with a construction cost of 5.5 million yuan. According to the invention, the construction cost of building an 18m fine-grained tailings thickening system was only 500,000 yuan, reducing the investment cost by 91%. According to the annual operation of the mine for 330 days, 165,000 tons of coarse sand can be produced annually. According to the average price of coarse sand of 20 yuan / ton, the annual economic benefits can be increased by 3.3 million yuan. At the same time, the tailings pond capacity can be saved by 120,000 cubic meters per year.

[0071] Field Example 2

[0072] A mine adopts backfill mining method. The tailings output of the concentrator is 1,500 tons / day. The tailings have a true specific gravity of 2.6, and the output particle size of -200 mesh accounts for 50-55%. Among them, about 1,000 tons / day of coarse-grained tailings are all used for underground backfilling. About 500 tons / day of -400 mesh fine-grained tailings are transported to the brick factory by car after two-stage dehydration treatment. Among them, the first stage of dehydration uses a high-efficiency thickener, and the flocculant addition amount is 20 grams / ton. The fine tailings slurry concentration can be increased from 25% to 45%; the second stage of dehydration uses a plate and frame filter press, and the filter cake moisture can be controlled at about 20-22%, which meets the needs of automobile transportation. The tailings filter cake is transported 30 kilometers away, and the freight is 15 yuan / ton (wet weight).

[0073] In order to further reduce the operating cost, the mine adopts the fine-grained slurry concentration system and control method of the present invention under confidentiality. The specific parameters are as follows: the diameter of the settling tube 2 is 18m and the height is 2m; the angle of the concentration cone 1 is 60° and the height is 14.5m; the compression pipe 8 uses two φ530×12mm seamless steel pipes. The height of the compression pipe 8 is calculated as follows, and the result is about 48m:

[0074] formula ;

[0075] Where L is the height of the compression tube, m; C w —The mass concentration of the ore slurry in the compression tube bottom flow is taken as 75%; ρ0—the true specific gravity of the ore is taken as 2.6.

[0076] Then L=2.7×75 / 2.6-30=47.9≈48m.

[0077] The high pressure air supply pressure at the bottom of the compression pipe 8 is calculated as follows, and the result is about 8.3Mpa:

[0078] formula ;

[0079] Where P is the high-pressure air or high-pressure water supply pressure, MPa; K is the safety correction factor, which is 1.3; C is the average mass concentration of the slurry, %; , is 50.0%; C0—initial feed slurry mass concentration, 25%C w —Mass concentration of ore pulp in the bottom flow of the compression tube, 75%; g—gravity coefficient, 9.8N / kg; ρ0—true specific gravity of ore, 2.6; ρ—true specific gravity of clean water, 1.0; h—sum of the heights of the sedimentation tube, concentrating cone and compression tube, 64.5m.

[0080] Then there is .

[0081] The main parts such as the settling tube 2, the concentration cone 1, and the overflow tank 4 are all made of galvanized canvas. The total height of the concentration system is 64.5m. The mine is located in a mountainous area, and the concentration system is built by making full use of the mountain terrain, and the bottom discharge device is on the surface.

[0082] After the system was put into use, the tailings of the ore dressing plant were graded, and the coarse sand was used for underground filling; the fine sand slurry entered the concentration system. After sedimentation, concentration and ultra-high pressure compression, a certain amount of defoamer (8g / t) and water reducer (5g / t) were added, and the bottom flow formed a paste with a moisture content of about 25%. In view of the paste formed in the concentration system, the ore dressing plant used a plunger pump to feed the filter press, which greatly improved the working efficiency of the filter press, reduced the cycle time from 45 minutes to 15 minutes, and reduced the moisture content of the tailings filter cake to below 20%. Compared with the original production model, the working efficiency of the tailings filter press has increased by more than 60%, and the operating cost has been reduced to 1 / 3 of the original; the concentration system does not require flocculants, which reduces the cost of reagents; during automobile transportation, the moisture content of the tailings is reduced by 2%, saving transportation costs.

[0083] According to the annual production days of 330 days of the mine, the annual output of fine tailings is 165,000 tons. The cost of fine tailings filtration and dehydration is about 6.5 yuan / ton (including equipment depreciation, labor, electricity consumption, and spare parts). After adopting the concentration system in this invention, the filtration cost is reduced to 1 / 3 of the original, and the annual production cost can be saved by 715,000 yuan; the original concentration operation consumes 3,300 kg of flocculants per year, and according to 10 yuan / kg, the annual cost of reagents can be saved by 33,000 yuan; after adopting the new concentration system, the moisture content of the outbound tailings is reduced by 2%, and the annual outbound weight is reduced by about 5,300 tons, saving 79,500 yuan in transportation costs. In summary, after using the low-cost and high-performance fine-grained slurry concentration method, the mine saves 827,500 yuan in operating costs per year, achieving the purpose of reducing costs and increasing efficiency.

[0084] Although the present invention has been described in detail by reference to the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A low-cost, high-performance fine-grained slurry thickening system, comprising a thickening cone (1) and a settling cylinder (2) connected to the upper end of the thickening cone (1), wherein an overflow trough (4) is provided at the upper end of the settling cylinder (2), characterized in that: The lower end of the concentration cone (1) is connected to two compression pipes (8); the compression pipe (8) is 20 to 50 meters high; the lower end of the compression pipe (8) is connected to a discharge pipe (11); the concentration system further comprises a distribution device (3), the distribution device (3) comprising a central tube (3-5), a spiral feeder (3-3) arranged around the central tube (3-5), and a central distribution device (3-2) having a central feeding pipe (3-1) connected to the upper end and a lower port located directly above the central tube (3-5); the spiral feeder (3-3) is connected to the central feeding pipe (3-1) and the lower port is located directly above the central tube (3-5). The material container (3-3) is an annular flow channel opening upward, the annular flow channel comprising an annular bottom plate (3-3-3), an outer wall plate (3-3-2) connected to the outer side of the annular bottom plate (3-3-3), and an inner wall plate (3-3-1) connected to the inner side of the annular bottom plate (3-3-3); the material distribution device (3) further comprises a tangential material feeding pipe (3-4) running tangential to the annular flow channel and having an inner end connected to the annular flow channel; the height of the outer wall plate (3-3-2) is greater than that of the inner wall plate (3-3-1); The settling cylinder (2) has a diameter of 18 m and a height of 2 m; the concentration cone (1) has an angle of 60° and a height of 14.5 m; the compression pipe (8) is made of two φ530×12 mm seamless steel pipes, and the height L of the compression pipe (8) is determined by the following formula: ； Where L is the height of the compression tube, m; C w —Mass concentration of ore slurry in the compression tube bottom flow, %; ρ0—True specific gravity of ore.

2. The concentrating system according to claim 1, characterized in that: The concentration cone (1), the settling cylinder (2) and the overflow trough (4) are all made of galvanized canvas.

3. The concentrating system according to claim 1 or 2, characterized in that: The compression pipe (8) is connected to a defoaming agent feeding pipe (6) and a water reducing agent feeding pipe (7).

4. The control method of the concentration system according to claim 3, characterized in that: 1-10 g / t of slurry defoamer is added through the defoamer feeding pipe (6); 1-8 g / t of slurry water reducer is added through the water reducer feeding pipe (7).

5. The concentrating system according to claim 1 or 2, characterized in that: The lower end of the compression tube (8) is connected to an air inlet pipe (9) for receiving high-pressure gas and a water inlet pipe (10) for receiving cleaning water.

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