A system and method for comprehensive and efficient utilization of metal mine tailings classification

Abstract

A system and method for comprehensive and efficient utilization of metal mine tailings by classification, the system includes a coarse sand commercial utilization subsystem, a wastewater recycling subsystem and a fine-grained slurry filling subsystem. The method is as follows: the tailings slurry of the ore dressing plant is directly introduced into a hydrocyclone for solid-liquid separation, the coarse sand is dehydrated and naturally air-dried to form construction sand for sale, the fine-grained slurry is discharged after two-stage centrifugation, the wastewater is treated and supplied to the ore dressing plant, the concentrated fine-grained slurry formed by centrifugation is introduced into a buffer tank or a fine-grained slurry transport vehicle for temporary storage, the fine-grained slurry temporarily stored in the buffer tank or the fine-grained slurry transport vehicle is introduced into a first slurry mixer, and at the same time, the binder in the binder silo is also introduced into the first slurry mixer through a double-tube screw feeder, and the filling slurry is prepared in the first slurry mixer; the preliminarily prepared filling slurry is introduced into the second slurry mixer again, and the second slurry mixer deeply stirs the filling slurry, and finally the filling slurry is transported to the underground mining site through a slurry pump.

Description

Technical Field

[0001] The invention belongs to the technical field of metal mine tailings classification and utilization, and in particular relates to a system and method for comprehensive and efficient utilization of metal mine tailings classification. Background Art

[0002] Mining is the process of blasting underground ore and transporting it to the surface, while beneficiation is the process of further crushing and grinding the ore and separating the minerals using physical and chemical methods. Taking gold mining as an example, for gold ore with a grade of 25 grams per ton, after mining and beneficiation, tailings with a weight close to that of the original ore will be produced.

[0003] In the past, tailings were usually directly treated by building tailings ponds, but tailings ponds have always faced problems such as environmental pollution, dam breaches, and occupation of arable land. After long-term and intensive development of my country's metal mineral resources, a large number of mine tailings ponds have been formed. The existence of these tailings ponds not only increases the economic burden of enterprises, but also poses environmental pollution and safety hazards, becoming a major problem that needs to be solved in ecological construction. How to harmlessly treat tailings, and from the perspective of economic benefits, classify and efficiently utilize tailings to build tailing-free mines is the vision of the metal mining industry.

[0004] Therefore, from the perspective of environmental protection and mining safety, backfill mining has gradually become the development trend of metal mining technology at home and abroad. Backfilling is a process of using tailings as aggregates and a certain amount of cementing materials (such as cement) to make a high-concentration slurry or a paste-like state and transport it to the underground goaf. It has the advantages of improving resource recovery rate, energy saving and emission reduction, environmental protection, and safety and reliability.

[0005] However, for non-ferrous metal mines, the ore grade they produce is low. Even if the full tailings filling process is adopted, some or even half of the tailings still need to be discharged to the ground. That is to say, although the filling process can effectively dispose of and utilize tailings waste, the economic cost and process reliability have become constraints on its further promotion.

[0006] In the current filling process, vertical sand bins or deep cone thickeners are usually used for dehydration to process tailings into high-concentration slurry. However, affected by the mineral processing technology, the particle gradation in the high-concentration slurry varies greatly. Some filling processes can use all tailings for filling, while some filling processes can choose graded tailings that are beneficial to the filling process for filling. The above conventional filling processes all make the most of the coarse tailings components. Excess fine tailings and ultra-fine tailings still need to be discharged into the tailings pond.

[0007] With the rapid development of my country's construction industry, there has been a large gap in construction sand, and the harmless graded coarse tailings from metal mines can partially fill the shortage of construction sand. In addition, the mineral processing process consumes a lot of water resources. If the comprehensive utilization of industrial circulating water can be fully considered in the tailings separation process, it is also a practical issue that green mine builders need to consider.

[0008] From the above industrial background analysis, it is not difficult to see that the current filling process tends to use coarse tailings. Under this filling process, a large amount of fine tailings and industrial water like mud have to be discharged into the tailings pond, resulting in extremely low resource utilization of fine tailings. How to deal with fine tailings is a bottleneck technical problem in the comprehensive solution to the comprehensive utilization of metal mine tailings. Summary of the invention

[0009] In view of the problems existing in the prior art, the present invention provides a system and method for comprehensive and efficient utilization of metal mine tailings classification, which can effectively solve the problem of metal mine tailings treatment and produce coarse sand that meets the standards for construction sand. The produced coarse sand can be sold to the construction industry or used for underground filling. The sale of coarse sand can effectively share the filling cost, and the produced fine-particle slurry can be used for underground cementation filling. Industrial waste water can be treated to produce clean water for mineral processing plant production, which effectively solves the problem of comprehensive utilization of coarse tailings, fine tailings and circulating water, greatly improves the utilization rate of tailings resources, and fundamentally solves a series of ecological environment, safety and cost problems brought about by mine tailings ponds.

[0010] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a metal mine tailings classification, comprehensive and efficient utilization system, including a coarse sand commercial utilization subsystem, a wastewater recycling subsystem and a fine-grained slurry filling subsystem; the coarse sand commercial utilization subsystem includes a hydrocyclone, a banana-type vibrating screen, a shovel and a transport truck; the tailings feed port of the hydrocyclone is used to pass the tailings slurry discharged from the ore dressing plant, the sand settling mouth of the hydrocyclone is connected to the feed end of the banana-type vibrating screen, and the discharge end of the banana-type vibrating screen is used to discharge the dehydrated coarse sand, and the coarse sand is naturally dried to form a dry pile of coarse sand; the shovel is used to transfer the dry pile The coarse sand is transferred to a transport truck; the transport truck is used to transport the coarse sand to the construction site; the wastewater recycling subsystem includes a first horizontal screw centrifuge, a second horizontal screw centrifuge, a horizontal flow inclined tube sedimentation tank, a buffer tank and a fine-grained slurry transport vehicle; the feed port of the first horizontal screw centrifuge is connected to the overflow port of the hydrocyclone, the liquid phase discharge port of the first horizontal screw centrifuge is connected to the feed port of the second horizontal screw centrifuge, and the liquid phase discharge port of the second horizontal screw centrifuge is connected to the feed port of the horizontal flow inclined tube sedimentation tank; the water outlet of the horizontal flow inclined tube sedimentation tank is used to output clean water, and the output clean water is directly supplied to the ore dressing plant; the The solid phase discharge ports of the first horizontal screw centrifuge and the second horizontal screw centrifuge are both connected to the feed port of the buffer tank or the fine-grained slurry transport vehicle, and when the fine-grained slurry transport vehicle is used, it is suitable for a separate filling station; the fine-grained slurry filling subsystem includes a binder transport vehicle, a binder silo, a double-tube screw feeder, a first slurry mixer, a second slurry mixer and a slurry pump; the discharge port of the binder transport vehicle is connected to the feed port of the binder silo, the discharge port of the binder silo is connected to the feed port of the double-tube screw feeder, the discharge port of the double-tube screw feeder is connected to the binder feed port of the first slurry mixer, and the first slurry mixer is connected to the feed port of the first slurry mixer. The slurry feed port of the mixer is connected with the discharge port of the buffer tank or the fine-grained slurry transport vehicle; the slurry discharge port of the first slurry mixer is connected with the slurry feed port of the second slurry mixer, the slurry discharge port of the second slurry mixer is connected with the feed port of the slurry pump, and the discharge port of the slurry pump is connected with the goaf of the underground mining site; when the filling slurry needs to be concentrated or the fine-grained slurry has insufficient filling capacity, a coarse-grained slurry concentration bin is also provided, and the coarse sand required in the coarse-grained slurry concentration bin is obtained from the dry pile of coarse sand and transported by a transport truck, and the discharge port of the coarse-grained slurry concentration bin is connected with the coarse-grained slurry feed port of the second slurry mixer.

[0011] A first electric valve is arranged at the overflow port of the hydrocyclone; a second electric valve is arranged at the solid phase discharge port of the first horizontal screw centrifuge, and a third electric valve is arranged at the liquid phase discharge port of the first horizontal screw centrifuge; a fourth electric valve is arranged at the solid phase discharge port of the second horizontal screw centrifuge, and a fifth electric valve is arranged at the liquid phase discharge port of the second horizontal screw centrifuge; a level meter is arranged in the cementing silo, and a plate gate valve is arranged at the discharge port of the cementing silo; a sixth electric valve, a first gamma-ray concentration meter and a first electromagnetic flowmeter are arranged in sequence at the slurry inlet of the first slurry mixer; a seventh electric valve, a second gamma-ray concentration meter and a second electromagnetic flowmeter are arranged in sequence at the slurry discharge port of the first slurry mixer; an eighth electric valve, a third gamma-ray concentration meter and a second electromagnetic flowmeter are arranged in sequence at the slurry discharge port of the second slurry mixer.

[0012] A method for comprehensive and efficient utilization of metal mine tailings by grading, which adopts the system for comprehensive and efficient utilization of metal mine tailings by grading, comprises the following steps:

[0013] Step 1: The tailings slurry discharged from the concentrator is passed into the hydrocyclone. After the tailings slurry enters the hydrocyclone, the coarse sand in the tailings slurry moves downward and falls into the banana-shaped vibrating screen below through the sand settling nozzle. After being dehydrated by the banana-shaped vibrating screen, it is stored. The stored coarse sand is naturally dried to form dry pile coarse sand. The dry pile coarse sand is finally sold as construction sand. The coarse sand after sale is transported to the construction site by transport trucks for use;

[0014] Step 2: passing the fine-grained slurry flowing out of the overflow port of the hydrocyclone into the first horizontal screw centrifuge, and the first horizontal screw centrifuge preliminarily concentrates the fine-grained slurry, and then passing the fine-grained slurry produced after the preliminary concentration into the buffer tank through the solid phase discharge port of the first horizontal screw centrifuge for temporary storage; when applied to a separate filling station, the fine-grained slurry produced after the preliminary concentration needs to be passed into the fine-grained slurry transport vehicle through the solid phase discharge port of the first horizontal screw centrifuge for temporary storage;

[0015] Step 3: The wastewater containing a small amount of fine tailings flowing out of the liquid phase discharge port of the first decanter centrifuge is passed into the second decanter centrifuge, and the wastewater containing a small amount of fine tailings is secondary concentrated by the second decanter centrifuge. Then, the fine-grained slurry produced after the secondary concentration is passed into the buffer tank through the solid phase discharge port of the second decanter centrifuge for temporary storage. At the same time, the wastewater flowing out of the liquid phase discharge port of the second decanter centrifuge is passed into the horizontal flow inclined tube sedimentation tank, and the clean water is output after being treated in the horizontal flow inclined tube sedimentation tank. The clean water is directly supplied to the ore dressing plant for use, and finally the recycling of wastewater is realized; when applied to the separation filling station, the fine-grained slurry produced after the secondary concentration needs to be passed into the fine-grained slurry transport vehicle through the solid phase discharge port of the first decanter centrifuge for temporary storage;

[0016] Step 4: The fine-grained slurry temporarily stored in the buffer tank is introduced into the first slurry mixer. During the process of introducing the fine-grained slurry, the slurry concentration is monitored by the first γ-ray concentration meter, the slurry flow rate is monitored by the first electromagnetic flowmeter, and the slurry flow rate is controlled by the sixth electric valve; when applied to a separate filling station, it is necessary to first transport the temporarily stored fine-grained slurry to the filling station by a fine-grained slurry transport vehicle, and then the fine-grained slurry temporarily stored in the fine-grained slurry transport vehicle is introduced into the first slurry mixer. During the process of introducing the fine-grained slurry, it is also necessary to monitor the slurry concentration by the first γ-ray concentration meter, monitor the slurry flow rate by the first electromagnetic flowmeter, and control the slurry flow rate by the sixth electric valve;

[0017] Step 5: The binder in the binder transport vehicle is passed into the binder silo, the binder level in the binder silo is monitored by a level meter, the discharge of the binder is controlled by a plate gate valve, the binder is passed into a double-tube screw feeder through the plate gate valve, and finally the binder of the set ratio is passed into the first slurry mixer through the double-tube screw feeder. At this time, the first slurry mixer also plays a role of buffering and gathering.

[0018] Step 6: The fine-grained ore slurry and the binder are uniformly stirred by the first slurry mixer until a filling slurry is formed, and then the filling slurry is passed into the second slurry mixer. At this time, the second slurry mixer also plays an activation and concentration adjustment role. In the process of passing the filling slurry into the second slurry mixer, the concentration of the filling slurry is monitored by the second gamma-ray concentration meter, the flow rate of the filling slurry is monitored by the second electromagnetic flowmeter, and the flow rate of the filling slurry is controlled by the seventh electric valve;

[0019] Step 7: The introduced filling slurry is deeply stirred by the second slurry mixer until the filling slurry reaches the designed fluidity and uniformity requirements, and then the filling slurry is introduced into the slurry pump. In the process of introducing the filling slurry into the slurry pump, the concentration of the filling slurry is monitored by the third γ-ray concentration meter, the flow rate of the filling slurry is monitored by the second electromagnetic flowmeter, and the flow rate of the filling slurry is controlled by the eighth electric valve; when the filling slurry needs to be concentrated or the filling capacity of the fine-grained slurry is insufficient, the coarse-grained slurry needs to be introduced into the second slurry mixer through the coarse-grained slurry concentration bin;

[0020] Step 8: The slurry pump transports the filling slurry of the set concentration through the pipeline network to the goaf of the underground mining site until the filling of the goaf is completed.

[0021] Beneficial effects of the present invention:

[0022] The metal mine tailings grading, comprehensive and efficient utilization system and method of the present invention can effectively solve the problem of metal mine tailings treatment, and produce coarse sand that meets the standards for construction sand. The produced coarse sand can be sold to the construction industry or used for underground filling. The external sale of coarse sand can effectively share the filling cost, and the produced fine-grained slurry can be used for underground cementation filling. Industrial waste water can be treated to produce clean water for mineral processing plant production, which effectively solves the problem of comprehensive utilization of coarse tailings, fine tailings and circulating water, greatly improves the utilization rate of tailings resources, and fundamentally solves a series of ecological environment, safety and cost problems caused by mine tailings ponds. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural principle diagram of a metal mine tailings classification, comprehensive and efficient utilization system of the present invention (applicable to non-separation filling stations, when there is no need to adjust the concentration of the filling slurry or the filling capacity of the fine-grained slurry is sufficient);

[0024] Figure 2 It is a structural principle diagram of a metal mine tailings classification, comprehensive and efficient utilization system of the present invention (applicable to separate filling stations, when the filling slurry needs to be adjusted in concentration or the filling capacity of fine-grained slurry is insufficient);

[0025] In the figure, 1 is a hydrocyclone, 2 is a banana-type vibrating screen, 3 is a forklift, 4 is a transport truck, 5 is a dry-stacked coarse sand, 6 is a construction site, 7 is a first horizontal screw centrifuge, 8 is a second horizontal screw centrifuge, 9 is a horizontal inclined tube sedimentation tank, 10 is a buffer tank, 11 is a fine-grained slurry transport truck, 12 is a cementing material transport truck, 13 is a cementing material silo, 14 is a double-tube screw feeder, 15 is a first slurry mixer, 16 is a second slurry mixer, 17 is a slurry pump, 18 is an underground stope, 19 is a Coarse-grained slurry concentration bin, 20—first electric valve, 21—second electric valve, 22—third electric valve, 23—fourth electric valve, 24—fifth electric valve, 25—level meter, 26—plate gate valve, 27—sixth electric valve, 28—first gamma-ray concentration meter, 29—first electromagnetic flowmeter, 30—seventh electric valve, 31—second gamma-ray concentration meter, 32—second electromagnetic flowmeter, 33—eighth electric valve, 34—third gamma-ray concentration meter, 35—third electromagnetic flowmeter. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , 2As shown, a metal mine tailings classification, comprehensive and efficient utilization system includes a coarse sand commercial utilization subsystem, a wastewater recycling subsystem and a fine-grained slurry filling subsystem; the coarse sand commercial utilization subsystem includes a hydrocyclone 1, a banana-type vibrating screen 2, a shovel 3 and a transport truck 4; the tailings feed port of the hydrocyclone 1 is used to pass the tailings slurry discharged from the ore dressing plant, the sand settling mouth of the hydrocyclone 1 is connected to the feed end of the banana-type vibrating screen 2, and the discharge end of the banana-type vibrating screen 2 is used to discharge the dehydrated coarse sand, and the coarse sand is naturally dried to form a dry pile of coarse sand 5; the shovel 3 is used to transfer the dry pile of coarse sand 5 to the transport truck 4; the transport truck 4 is used to transfer the coarse sand transported to the construction site 6; the wastewater recycling subsystem includes a first decanter centrifuge 7, a second decanter centrifuge 8, a horizontal flow inclined tube sedimentation tank 9, a buffer tank 10 and a fine-particle slurry transport vehicle 11; the feed port of the first decanter centrifuge 7 is connected to the overflow port of the hydrocyclone 1, the liquid phase discharge port of the first decanter centrifuge 7 is connected to the feed port of the second decanter centrifuge 8, and the liquid phase discharge port of the second decanter centrifuge 8 is connected to the feed port of the horizontal flow inclined tube sedimentation tank 9; the water outlet of the horizontal flow inclined tube sedimentation tank 9 is used to output clean water, and the output clean water is directly supplied to the ore dressing plant; the solid phase discharge ports of the first decanter centrifuge 7 and the second decanter centrifuge 8 are both connected to The feed port of the buffer tank 10 or the fine-grained slurry transport vehicle 11 is connected, and when the fine-grained slurry transport vehicle 11 is used, it is suitable for a separate filling station; the fine-grained slurry filling subsystem includes a binder transport vehicle 12, a binder bin 13, a double-tube screw feeder 14, a first slurry mixer 15, a second slurry mixer 16 and a slurry pump 17; the discharge port of the binder transport vehicle 12 is connected to the feed port of the binder bin 13, the discharge port of the binder bin 13 is connected to the feed port of the double-tube screw feeder 14, the discharge port of the double-tube screw feeder 14 is connected to the binder feed port of the first slurry mixer 15, and the slurry feed port of the first slurry mixer 15 is connected to The discharge port of the buffer tank 10 or the fine-grained slurry transport vehicle 11 is connected; the slurry discharge port of the first slurry mixer 15 is connected to the slurry feed port of the second slurry mixer 16, the slurry discharge port of the second slurry mixer 16 is connected to the feed port of the slurry pump 17, and the discharge port of the slurry pump 17 is connected to the goaf of the underground mining area 18; when the filling slurry needs to be concentrated or the fine-grained slurry has insufficient filling capacity, a coarse-grained slurry concentration bin 19 is also provided, and the coarse sand required in the coarse-grained slurry concentration bin 19 is obtained from the dry pile of coarse sand 5 and transported by the transport truck 4, and the discharge port of the coarse-grained slurry concentration bin 19 is connected to the coarse-grained slurry feed port of the second slurry mixer 16.

[0028] A first electric valve 20 is provided at the overflow port of the hydrocyclone 1; a second electric valve 21 is provided at the solid phase discharge port of the first decanter centrifuge 7, and a third electric valve 22 is provided at the liquid phase discharge port of the first decanter centrifuge 7; a fourth electric valve 23 is provided at the solid phase discharge port of the second decanter centrifuge 8, and a fifth electric valve 24 is provided at the liquid phase discharge port of the second decanter centrifuge 8; a level meter 25 is provided in the cementing silo 13, and a level meter 25 is provided at the discharge port of the cementing silo 13. There is a plate gate valve 26; a sixth electric valve 27, a first gamma-ray concentration meter 28 and a first electromagnetic flowmeter 29 are sequentially arranged at the slurry inlet of the first slurry mixer 15; a seventh electric valve 30, a second gamma-ray concentration meter 31 and a second electromagnetic flowmeter 32 are sequentially arranged at the slurry discharge port of the first slurry mixer 15; an eighth electric valve 33, a third gamma-ray concentration meter 34 and a third electromagnetic flowmeter 35 are sequentially arranged at the slurry discharge port of the second slurry mixer 16.

[0029] In this embodiment, the tailings slurry discharged from the concentrator has a concentration of 30% to 40%, the concentration of the fine-grained slurry flowing out of the overflow port of the hydrocyclone 1 is controlled at 8% to 20%, the concentration of the coarse sand slurry discharged from the sand settling nozzle of the hydrocyclone 1 is controlled at 60% to 80%, and the overflow rate of the hydrocyclone 1 is controlled at 40m 3 / h, the main engine speed of the first decanter centrifuge 7 and the second decanter centrifuge 8 is controlled at 800r / min~3000r / min, the separation factor of the first decanter centrifuge 7 and the second decanter centrifuge 8 is 1200~4500, the differential speed of the first decanter centrifuge 7 and the second decanter centrifuge 8 is 5r / min~40r / min, and the main engine speed and separation factor of the second decanter centrifuge 8 are higher than those of the first decanter centrifuge 7, the differential speed of the second decanter centrifuge 8 is lower than that of the first decanter centrifuge 7, and the total processing capacity of the first decanter centrifuge 7 and the second decanter centrifuge 8 is 24.05t / h.

[0030] A method for comprehensive and efficient utilization of metal mine tailings by grading, which adopts the system for comprehensive and efficient utilization of metal mine tailings by grading, comprises the following steps:

[0031] Step 1: The tailings slurry discharged from the ore dressing plant is passed into the hydrocyclone 1. After the tailings slurry enters the hydrocyclone 1, the coarse sand in the tailings slurry moves downward and falls into the banana-shaped vibrating screen 2 below through the sand settling nozzle. After being dehydrated by the banana-shaped vibrating screen 2, it is stored. The coarse sand in the stored state is naturally dried to form dry pile coarse sand 5. The dry pile coarse sand 5 is finally sold as construction sand. The coarse sand after sale is transported to the construction site 6 by the transport truck 4 for use;

[0032] Step 2: The fine-grained slurry flowing out of the overflow port of the hydrocyclone 1 is passed into the first horizontal screw centrifuge 7, and the first horizontal screw centrifuge 7 performs preliminary concentration on the fine-grained slurry, and then the fine-grained slurry produced after the preliminary concentration is passed into the buffer tank 10 through the solid phase discharge port of the first horizontal screw centrifuge 7 for temporary storage; when applied to a separate filling station, the fine-grained slurry produced after the preliminary concentration needs to be passed into the fine-grained slurry transport vehicle 11 through the solid phase discharge port of the first horizontal screw centrifuge 7 for temporary storage;

[0033] Step 3: The wastewater containing a small amount of fine tailings flowing out of the liquid phase discharge port of the first horizontal screw centrifuge 7 is passed into the second horizontal screw centrifuge 8, and the second horizontal screw centrifuge 8 performs secondary concentration on the wastewater containing a small amount of fine tailings. Then, the fine-grained slurry produced after the secondary concentration is passed into the buffer tank 10 through the solid phase discharge port of the second horizontal screw centrifuge 8 for temporary storage. At the same time, the wastewater flowing out of the liquid phase discharge port of the second horizontal screw centrifuge 8 is passed into the horizontal flow inclined tube sedimentation tank 9, and the clean water is output after being treated in the horizontal flow inclined tube sedimentation tank 9. The clean water is directly supplied to the ore dressing plant for use, and finally the recycling of wastewater is realized; when applied to a separate filling station, the fine-grained slurry produced after the secondary concentration needs to be passed into the fine-grained slurry transport vehicle 11 through the solid phase discharge port of the first horizontal screw centrifuge 7 for temporary storage;

[0034] Step 4: The fine-grained slurry temporarily stored in the buffer tank 10 is introduced into the first slurry mixer 15. During the process of introducing the fine-grained slurry, the slurry concentration is monitored by the first γ-ray concentration meter 28, the slurry flow rate is monitored by the first electromagnetic flowmeter 29, and the slurry flow rate is controlled by the sixth electric valve 27. When applied to a separate filling station, the fine-grained slurry temporarily stored in the buffer tank 10 is first transported to the filling station by the fine-grained slurry transport vehicle 11, and then the fine-grained slurry temporarily stored in the fine-grained slurry transport vehicle 11 is introduced into the first slurry mixer 15. During the process of introducing the fine-grained slurry, the slurry concentration is also monitored by the first γ-ray concentration meter 28, the slurry flow rate is monitored by the first electromagnetic flowmeter 29, and the slurry flow rate is controlled by the sixth electric valve 27.

[0035] Step 5: The binder in the binder transport vehicle 12 is passed into the binder bin 13, the binder level in the binder bin 13 is monitored by the level meter 25, the discharge of the binder is controlled by the plate gate valve 26, the binder is passed into the double-tube screw feeder 14 through the plate gate valve 26, and finally the binder of the set ratio is passed into the first slurry mixer 15 through the double-tube screw feeder 14. At this time, the first slurry mixer 15 also plays a role of buffering and gathering.

[0036] Step 6: The fine-grained ore slurry and the binder are uniformly stirred by the first slurry mixer 15 until a filling slurry is formed, and then the filling slurry is passed into the second slurry mixer 16. At this time, the second slurry mixer 16 also plays an activation and concentration adjustment role. In the process of passing the filling slurry into the second slurry mixer 16, the concentration of the filling slurry is monitored by the second γ-ray concentration meter 31, the flow rate of the filling slurry is monitored by the second electromagnetic flowmeter 32, and the flow rate of the filling slurry is controlled by the seventh electric valve 30;

[0037] Step seven: deeply stir the introduced filling slurry through the second slurry mixer 16 until the filling slurry reaches the designed fluidity and uniformity requirements, and then introduce the filling slurry into the slurry pump 17. In the process of introducing the filling slurry into the slurry pump 17, the concentration of the filling slurry is monitored by the third γ-ray concentration meter 34, the flow rate of the filling slurry is monitored by the third electromagnetic flowmeter 35, and the flow rate of the filling slurry is controlled by the eighth electric valve 33; when the filling slurry needs to be concentrated or the filling capacity of the fine-grained slurry is insufficient, the coarse-grained slurry needs to be introduced into the second slurry mixer 16 through the coarse-grained slurry concentration tank 19;

[0038] Step eight: The slurry pump 17 transports the filling slurry of the set concentration to the goaf of the underground stope 18 through the pipe network until the filling of the goaf is completed.

[0039] The solutions in the embodiments are not intended to limit the patent protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the patent scope of this case.

Claims

1. A system for comprehensive and efficient utilization of metal mine tailings classification, characterized by: It includes a coarse sand commercial utilization subsystem, a wastewater recycling subsystem and a fine-grained slurry filling subsystem; the coarse sand commercial utilization subsystem includes a hydrocyclone, a banana-type vibrating screen, a forklift and a transport truck; the tailings feed port of the hydrocyclone is used to introduce tailings slurry discharged from the ore dressing plant, the sand settling mouth of the hydrocyclone is connected to the feed end of the banana-type vibrating screen, and the discharge end of the banana-type vibrating screen is used to discharge the dehydrated coarse sand, and the coarse sand is naturally dried to form dry pile coarse sand; the forklift is used to transfer the dry pile coarse sand to the transport truck; the transport truck is used to transport the coarse sand to the construction site; The wastewater recycling subsystem includes a first decanter centrifuge, a second decanter centrifuge, a horizontal flow inclined tube sedimentation tank, a buffer tank and a fine-grained slurry transport vehicle; the feed port of the first decanter centrifuge is connected to the overflow port of the hydrocyclone, the liquid phase discharge port of the first decanter centrifuge is connected to the feed port of the second decanter centrifuge, and the liquid phase discharge port of the second decanter centrifuge is connected to the feed port of the horizontal flow inclined tube sedimentation tank; the water outlet of the horizontal flow inclined tube sedimentation tank is used to output clean water, and the output clean water is directly supplied to the ore dressing plant; the solid phase discharge ports of the first decanter centrifuge and the second decanter centrifuge are both connected to the feed port of the buffer tank or the fine-grained slurry transport vehicle, and when a fine-grained slurry transport vehicle is used, it is suitable for a separate filling station; the fine-grained slurry filling subsystem includes a binder transport vehicle, a binder silo, a double-tube screw feeder, a first slurry mixer, a second slurry mixer and a slag slurry The discharge port of the cementing material transport vehicle is connected to the feed port of the cementing material bin, the discharge port of the cementing material bin is connected to the feed port of the double-tube screw feeder, the discharge port of the double-tube screw feeder is connected to the cementing material feed port of the first slurry mixer, the slurry feed port of the first slurry mixer is connected to the discharge port of the buffer tank or the fine-grained slurry transport vehicle; the slurry discharge port of the first slurry mixer is connected to the slurry feed port of the second slurry mixer. The slurry discharge port of the second slurry mixer is connected with the feed port of the slurry pump, and the discharge port of the slurry pump is connected with the goaf of the underground mine; when the filling slurry needs to be concentrated or the filling capacity of the fine-grained slurry is insufficient, a coarse-grained slurry concentrating bin is also provided, and the coarse sand required in the coarse-grained slurry concentrating bin is obtained from the dry pile of coarse sand and transported by a transport truck, and the discharge port of the coarse-grained slurry concentrating bin is connected with the coarse-grained slurry feed port of the second slurry mixer.

2. A metal mine tailings classification, comprehensive and efficient utilization system according to claim 1, characterized in that: A first electric valve is arranged at the overflow port of the hydrocyclone; a second electric valve is arranged at the solid phase discharge port of the first horizontal screw centrifuge, and a third electric valve is arranged at the liquid phase discharge port of the first horizontal screw centrifuge; a fourth electric valve is arranged at the solid phase discharge port of the second horizontal screw centrifuge, and a fifth electric valve is arranged at the liquid phase discharge port of the second horizontal screw centrifuge; a level meter is arranged in the cementing silo, and a plate gate valve is arranged at the discharge port of the cementing silo; a sixth electric valve, a first gamma-ray concentration meter and a first electromagnetic flowmeter are arranged in sequence at the slurry inlet of the first slurry mixer; a seventh electric valve, a second gamma-ray concentration meter and a second electromagnetic flowmeter are arranged in sequence at the slurry discharge port of the first slurry mixer; an eighth electric valve, a third gamma-ray concentration meter and a third electromagnetic flowmeter are arranged in sequence at the slurry discharge port of the second slurry mixer.

3. A method for comprehensive and efficient utilization of metal mine tailings by grading, using the system for comprehensive and efficient utilization of metal mine tailings according to claim 1, characterized in that The steps include: Step 1: The tailings slurry discharged from the concentrator is passed into the hydrocyclone. After the tailings slurry enters the hydrocyclone, the coarse sand in the tailings slurry moves downward and falls into the banana-shaped vibrating screen below through the sand settling nozzle. After being dehydrated by the banana-shaped vibrating screen, it is stored. The stored coarse sand is naturally dried to form dry pile coarse sand. The dry pile coarse sand is finally sold as construction sand. The coarse sand after sale is transported to the construction site by transport trucks for use; Step 2: passing the fine-grained slurry flowing out of the overflow port of the hydrocyclone into the first horizontal screw centrifuge, and the first horizontal screw centrifuge preliminarily concentrates the fine-grained slurry, and then passing the fine-grained slurry produced after the preliminary concentration into the buffer tank through the solid phase discharge port of the first horizontal screw centrifuge for temporary storage; when applied to a separate filling station, the fine-grained slurry produced after the preliminary concentration needs to be passed into the fine-grained slurry transport vehicle through the solid phase discharge port of the first horizontal screw centrifuge for temporary storage; Step 3: The wastewater containing a small amount of fine tailings flowing out of the liquid phase discharge port of the first decanter centrifuge is passed into the second decanter centrifuge, and the wastewater containing a small amount of fine tailings is secondary concentrated by the second decanter centrifuge. Then, the fine-grained slurry produced after the secondary concentration is passed into the buffer tank through the solid phase discharge port of the second decanter centrifuge for temporary storage. At the same time, the wastewater flowing out of the liquid phase discharge port of the second decanter centrifuge is passed into the horizontal flow inclined tube sedimentation tank, and the clean water is output after being treated in the horizontal flow inclined tube sedimentation tank. The clean water is directly supplied to the ore dressing plant for use, and finally the recycling of wastewater is realized; when applied to the separation filling station, the fine-grained slurry produced after the secondary concentration needs to be passed into the fine-grained slurry transport vehicle through the solid phase discharge port of the first decanter centrifuge for temporary storage; Step 4: The fine-grained slurry temporarily stored in the buffer tank is introduced into the first slurry mixer. During the process of introducing the fine-grained slurry, the slurry concentration is monitored by the first γ-ray concentration meter, the slurry flow rate is monitored by the first electromagnetic flowmeter, and the slurry flow rate is controlled by the sixth electric valve; when applied to a separate filling station, it is necessary to first transport the temporarily stored fine-grained slurry to the filling station by a fine-grained slurry transport vehicle, and then the fine-grained slurry temporarily stored in the fine-grained slurry transport vehicle is introduced into the first slurry mixer. During the process of introducing the fine-grained slurry, it is also necessary to monitor the slurry concentration by the first γ-ray concentration meter, monitor the slurry flow rate by the first electromagnetic flowmeter, and control the slurry flow rate by the sixth electric valve; Step 5: The binder in the binder transport vehicle is passed into the binder silo, the binder level in the binder silo is monitored by a level meter, the discharge of the binder is controlled by a plate gate valve, the binder is passed into a double-tube screw feeder through the plate gate valve, and finally the binder of the set ratio is passed into the first slurry mixer through the double-tube screw feeder. At this time, the first slurry mixer also plays a role of buffering and gathering. Step 6: The fine-grained ore slurry and the binder are uniformly stirred by the first slurry mixer until a filling slurry is formed, and then the filling slurry is passed into the second slurry mixer. At this time, the second slurry mixer also plays an activation and concentration adjustment role. In the process of passing the filling slurry into the second slurry mixer, the concentration of the filling slurry is monitored by the second gamma-ray concentration meter, the flow rate of the filling slurry is monitored by the second electromagnetic flowmeter, and the flow rate of the filling slurry is controlled by the seventh electric valve; Step 7: The introduced filling slurry is deeply stirred by the second slurry mixer until the filling slurry reaches the designed fluidity and uniformity requirements, and then the filling slurry is introduced into the slurry pump. In the process of introducing the filling slurry into the slurry pump, the concentration of the filling slurry is monitored by the third γ-ray concentration meter, the flow rate of the filling slurry is monitored by the third electromagnetic flowmeter, and the flow rate of the filling slurry is controlled by the eighth electric valve; when the filling slurry needs to be concentrated or the filling capacity of the fine-grained slurry is insufficient, the coarse-grained slurry needs to be introduced into the second slurry mixer through the coarse-grained slurry concentration bin; Step 8: The slurry pump transports the filling slurry of the set concentration through the pipeline network to the goaf of the underground mining site until the filling of the goaf is completed.

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