A comprehensive recycling method of tailings

Abstract

The application provides a tailing comprehensive recycling method, and belongs to the technical field of mineral processing solid waste resource utilization, and solves the problems of existing tailing iron resource loss, sand material unable to be classified and utilized, low utilization rate of backwater, and fast consumption of tailing reservoir capacity and the like. In the method, tailings of each stage of magnetic separation and phosphorus separation are concentrated for pulp preparation, and building medium sand is separated through a straight screen and a dewatering screen; residual magnetic iron is recovered from the tailings of the magnetic separation through magnetic scanning and returned to the front-end magnetic separation system; fine sand aggregate is screened out from the tailings of the magnetic scanning; fine particle pulp is efficiently thickened through a tilting plate thickener, and overflow water is fully closed-circuit recycled and used for grinding, magnetic separation and flotation. The process realizes tailing reduction, resource utilization and recycling of mineral processing wastewater, greatly relieves the pressure of tailing reservoir storage, saves water and reduces consumption, has dual benefits of economy and environmental protection, and is suitable for tailing treatment of similar iron-phosphorus associated mines in Chengde region.

Description

Technical Field

[0001] This invention belongs to the field of tailings treatment technology, and relates to a recycling method, particularly a comprehensive tailings recycling method. Background Technology

[0002] In the beneficiation process of iron-phosphate polymetallic ores, a large amount of magnetic separation tailings, phosphorus beneficiation tailings, scavenging tailings, and combined tailings are usually produced as byproducts. These tailings are mostly discharged in the form of slurry, and the solid phase contains both coarse medium and fine sand as well as fine-grained slime. At the same time, due to the limited recovery rate of the front-end magnetic separation and flotation operations, a certain amount of magnetic iron minerals inevitably remain in the tailings slurry.

[0003] Currently, the conventional treatment method for this type of tailings is to combine the tailings slurry generated from each production stage and transport it directly to a tailings dam via pipelines or ditches, or to perform simple high-concentration thickening using thickening equipment before it enters the tailings dam. Although this method is simple and convenient, long-term production practice has shown that it has the following significant shortcomings: (1) The residual iron resources are seriously lost. The magnetic separation tailings and phosphorus separation tailings still contain some fine-grained magnetic iron minerals. After they are directly discharged into the tailings pond, these iron minerals can hardly be recovered, resulting in permanent loss of iron resources and reducing the overall metal recovery rate of the mine.

[0004] (2) Tailings ponds face high storage pressure and waste of sand resources. The coarse-grained medium sand, fine sand and fine-grained sludge in the tailings slurry are mixed and discharged. On the one hand, this results in a wide range of particle sizes and poor classification effect of the materials stored in the tailings pond. The fine-grained sludge settles slowly, which increases the difficulty of tailings pond dam management and backwater clarification. On the other hand, the medium sand and fine sand that could have been used as building sand or other building material raw materials cannot be separated and utilized separately, resulting in the waste of useful sand resources and increasing the storage capacity of the tailings pond.

[0005] (3) High consumption of fresh water and low recycling rate of wastewater. Under the traditional treatment mode, the clarified water of tailings pond or the overflow water of thickener is often difficult to be directly reused in mineral processing production due to high suspended solids content or failure to be effectively collected; the grinding, magnetic separation, flotation and other links of the mineral processing plant can only be supplemented with a large amount of fresh water, which not only leads to high consumption of fresh water in mineral processing, but also increases the load and treatment cost of subsequent mineral processing wastewater treatment facilities.

[0006] (4) Each process operates in isolation and lacks systematic connection. The existing tailings treatment process generally lacks effective integration and coordination of "residual iron recovery - coarse / medium / fine sand classification - fine-grained slurry concentration - overflow water recycling". Each treatment unit is independent of each other and cannot achieve the overall goal of tailings reduction, resource utilization and mineral processing wastewater recycling. The comprehensive recycling rate of tailings is low. Summary of the Invention

[0007] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a comprehensive tailings recycling method. The technical problem this invention aims to solve is: how to achieve tailings reduction, resource recovery, and recycling of mineral processing wastewater.

[0008] The objective of this invention can be achieved through the following technical solutions: A method for comprehensive recycling of tailings includes the following steps: S1. Tailings Source and Centralized Transportation The tailings from the first stage of magnetic separation, the tailings from the second and third stages of magnetic separation, the total tailings, the tailings from phosphorus beneficiation or scavenging are transported to the tailings treatment system via slurry pumps to form a centralized tailings slurry. S2, coarse-grained slag separator and medium sand dewatering The tailings slurry is first screened by a linear screen. The medium sand on the screen enters a dewatering screen for dewatering, forming medium sand material that can be stored separately or used in a comprehensive manner. The slurry under the screen enters the subsequent inclined plate thickening and inclined plate overflow for fine particle treatment. S3, Magnetic scanning recovery of phosphorus flotation tailings After fine-grained processing, the slurry enters the magnetic separation equipment to recover residual magnetic iron minerals, resulting in magnetic tailings and magnetic iron minerals. The magnetic iron minerals are returned to the iron concentrate system, magnetic separation system, or reprocessing process, while the magnetic tailings enter the tailings classification and concentration system. S4. Fine sand screening and fine sand collection The slag-sweeping tailings enter the slag-separating and thickening workshop, where they are screened by a fine sand screen to separate fine sand. The fine sand is then conveyed by a belt to the fine sand stockpile for storage or further comprehensive utilization. S5, Fine-grained slurry concentration The slurry that passes through the fine sand screen and the overflow from the fine-particle hydrocyclone enter the thickener for sedimentation and concentration; the underflow from the thickener is pumped to the tailings dam or subsequent comprehensive utilization stage. S6, Overflow water recovery and circulation The overflow water from the thickener is pumped to a high-level water tank via an overflow pump or a return water pump, and then recycled to the grinding, magnetic separation, flotation and other production processes in the first, second and third concentrators.

[0009] Preferably, the linear screen has a screen aperture of 0.1-5mm, a processing capacity of 150-300 t / h per unit time, and uses a single-layer polyurethane screen, with a vibration frequency of 16.17Hz, an amplitude of 6-8mm, and an installation tilt angle of +2-+5°.

[0010] Preferably, the dewatering screen has a screen mesh size of 0.5 mm, a processing capacity of 55-80 t / h per unit time, and adopts a single-layer polyurethane screen, a vibration frequency of 16 Hz, an amplitude of 4-6 mm, an installation inclination angle of +3-+5° (uphill), and an output moisture content of 10%-14%.

[0011] Preferably, the fine sand screen has a screen aperture of 0.5 mm, a processing capacity of 55-80 t / h per unit time, and adopts a single-layer polyurethane screen, a vibration frequency of 16 Hz, an amplitude of 4-6 mm, an installation inclination angle of +3-+5° (uphill), and an output moisture content of 10%-14%.

[0012] Preferably, the thickener has an effective inclined plate settling area of ​​800㎡, the inclined plates are made of polypropylene or fiberglass, the inclined plate installation angle is set to 45°, and the plate spacing is 50mm; the thickener is equipped with a distributed inclined plate micro-vibration motor, a cone wall anti-blocking vibrator and a bottom discharge drive device, the total installed power of the whole machine is 7.5~9kW, the vibration mechanism speed is 960r / min, the vibration frequency is 16Hz, and the micro-amplitude is 3mm.

[0013] Preferably, the thickener feed slurry concentration is 3%–20%, and the maximum allowable feed particle size is ≤2mm; the underflow concentration without flocculant is 38%–45%, and the underflow concentration can reach 65% with the addition of 12g / t anionic flocculant and vibration operation, with a limiting underflow concentration of 75%; the slurry treatment flow rate range is 240–1200 m³ / h. 3 The corresponding dry tailings processing capacity is 40-105 t / h; the overflow turbidity is below 300 mg / L; the water recycling rate is not less than 75%; and the total slurry storage volume is approximately 120 m³. 3 The equipment weighs approximately 14.9 tons.

[0014] Compared with existing technologies, this comprehensive tailings recycling method has the following advantages: 1. Significantly improves iron resource recovery rate and reduces loss of valuable metals. For residual magnetic iron minerals still contained in phosphate tailings or magnetic separation tailings, a specially designed magnetic recovery operation is used to effectively recover this finely embedded magnetic iron and return it to the iron concentrate system. This avoids the loss of iron resources caused by the permanent discharge of iron into the tailings dam with the tailings, and improves the overall metal recovery level and resource utilization rate of the mine.

[0015] 2. Achieving graded utilization of medium and fine sand significantly reduces the amount of tailings entering the tailings dam, alleviating the pressure on tailings storage. After treatment by linear vibratory screens and dewatering screens, coarser medium sand can be pre-separated as sand that can be stored separately or utilized comprehensively. The magnetic tailings are then screened by fine sand screens to separate fine sand, further achieving effective separation of fine sand from fine-grained sludge. The separated medium and fine sand can be utilized as building sand, building material raw materials, etc., reducing the total amount of solids entering the tailings dam from the source, saving valuable tailings dam capacity, helping to extend the service life of the tailings dam, and reducing the safety management risks of the dam.

[0016] 3. Efficient recovery and recycling of mineral processing overflow water significantly reduces fresh water consumption and wastewater discharge. After the fine-grained slurry undergoes efficient sedimentation and concentration in a thickener, the clarified water is pumped to a high-level water tank via an overflow pump and directly returned to the grinding, magnetic separation, and flotation processes in the primary, secondary, and tertiary mineral processing plants for reuse. This establishes a closed-loop water circulation system, significantly reducing the need for external fresh water replenishment during mineral processing, while also reducing the amount and load of wastewater to be treated at the end of the process, achieving excellent water conservation and emission reduction effects.

[0017] 4. High system integration and smooth process coordination enable overall reduction and resource recovery of tailings. This method organically connects the entire process of "centralized tailings transportation - medium sand dewatering - residual iron magnetic sweeping - fine sand screening - fine particle concentration - water recycling," with each process closely linked and matched to the others, overcoming the drawbacks of isolated operation and lack of coordination among processing units in existing technologies. The overall solution not only achieves dual resource recovery of magnetic iron and building sand from tailings, but also realizes efficient closed-loop utilization of process water through concentration and water recycling. It demonstrates significant comprehensive advantages in terms of economic, environmental, and social benefits, providing a mature and reliable technical approach for the efficient and comprehensive recovery and utilization of tailings from similar iron-phosphate polymetallic ore beneficiation.

[0018] 5. This invention addresses the particle size and magnetic iron occurrence characteristics of iron-phosphorus tailings by employing a reverse synergistic process: first, graded sand making; then, iron recovery, fine mud thickening, and closed-loop water recycling. The first step involves separating coarse and medium sand particles in advance using linear screens and dewatering screens, reducing solid waste entering the storage area at the source. The second step involves a magnetic sweeping unit precisely capturing finely embedded residual magnetite, compensating for shortcomings in front-end magnetic separation and recovery. The third step involves a fine sand screen separating fine aggregates for further tailings utilization. Finally, an inclined plate thickener enhances the solid-liquid separation of fine mud, with all low-turbidity overflow being reused. The materials and water flows in each process are interconnected, producing two valuable products—sand and gravel—and iron concentrate in stages, simultaneously achieving tailings reduction and water resource recycling, suitable for continuous and stable production in multiple concentrators. Attached Figure Description

[0019] Figure 1 This is a complete process flow diagram of the present invention; Figure 2is a schematic diagram of the layout of the medium sand classification and dewatering equipment of the linear screen + dewatering screen of the present invention; Figure 3 is a schematic diagram of the equipment connection of the magnetic scavenging recovery unit of the present invention; Figure 4 is a schematic diagram of the supporting conveying for the fine sand screen classification stockyard of the present invention; Figure 5 is a schematic structural diagram of the internal inclined plates and micro-vibration mechanism of the inclined plate thickener of the present invention; Figure 6 is a schematic diagram of the layout of the return water conveying pipe network of the high-level water tank of the present invention; Figure 7 is a schematic diagram of the layout of the fully automatic control pipelines and valves of the whole system of the present invention; Figure 8 is the main process equipment table in Example 1 of the present invention; Figure 9 is the data table of tailing treatment scale and product output in Example 1 of the present invention; Figure 10 is a summary table of effect comparison between Example 1 and Comparative Examples 1 to 3 in the present invention; Figure 11 is the table of pulp concentration / particle size change during the process of Example 1 in the present invention. DETAILED DESCRIPTION

[0020] The following are specific examples of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these examples.

[0021] Example 1 As Figure 1-11 shown, a comprehensive tailings recovery and utilization method comprises the following steps: S1. Tailings source and centralized conveying The first-stage magnetic separation tailings, second and third-stage magnetic separation tailings, total tailings, phosphorus separation tailings or scavenging tailings are conveyed to the tailings treatment system through a mortar pump to form centrally treated tailings pulp; S2. Coarse fraction residue removal and medium sand dewatering The tailings pulp is first screened by a linear screen, the oversize medium sand enters a dewatering screen for dewatering to form medium sand material that can be separately stockpiled or comprehensively utilized; the undersize pulp enters the subsequent inclined plate thickening, and the inclined plate overflow is subjected to fine fraction treatment; S3. Magnetic scavenging recovery of phosphorus flotation tailings The pulp after fine fraction treatment enters magnetic scavenging equipment to recover residual magnetic iron minerals, obtaining magnetic scavenging tailings and magnetic iron minerals; the magnetic iron minerals are returned to the iron concentrate system, magnetic separation system or reprocessing flow, and the magnetic scavenging tailings enter the tailings classification and thickening system; S4. Fine sand screening and fine sand collection The slag-sweeping tailings enter the slag-separating and thickening workshop, where they are screened by a fine sand screen to separate fine sand. The fine sand is then conveyed by a belt to the fine sand stockpile for storage or further comprehensive utilization. S5, Fine-grained slurry concentration The slurry that passes through the fine sand screen and the overflow from the fine-particle hydrocyclone enter the thickener for sedimentation and concentration; the underflow from the thickener is pumped to the tailings dam or subsequent comprehensive utilization stage. S6, Overflow water recovery and circulation The overflow water from the thickener is pumped to a high-level water tank via an overflow pump or a return water pump, and then recycled to the grinding, magnetic separation, flotation and other production processes in the first, second and third concentrators.

[0022] Preferably, the linear screen has a screen aperture of 0.1-5mm, a processing capacity of 150-300 t / h per unit time, and uses a single-layer polyurethane screen, with a vibration frequency of 16.17Hz, an amplitude of 6-8mm, and an installation tilt angle of +2-+5°.

[0023] Preferably, the dewatering screen has a screen mesh size of 0.5 mm, a processing capacity of 55-80 t / h per unit time, and adopts a single-layer polyurethane screen, a vibration frequency of 16 Hz, an amplitude of 4-6 mm, an installation inclination angle of +3-+5° (uphill), and an output moisture content of 10%-14%.

[0024] Preferably, the fine sand screen has a screen aperture of 0.5 mm, a processing capacity of 55-80 t / h per unit time, and adopts a single-layer polyurethane screen, a vibration frequency of 16 Hz, an amplitude of 4-6 mm, an installation inclination angle of +3-+5° (uphill), and an output moisture content of 10%-14%.

[0025] Preferably, the thickener has an effective inclined plate settling area of ​​800㎡, the inclined plates are made of polypropylene or fiberglass, the inclined plate installation angle is set to 45°, and the plate spacing is 50mm; the thickener is equipped with a distributed inclined plate micro-vibration motor, a cone wall anti-blocking vibrator and a bottom discharge drive device, the total installed power of the whole machine is 7.5~9kW, the vibration mechanism speed is 960r / min, the vibration frequency is 16Hz, and the micro-amplitude is 3mm.

[0026] Preferably, the thickener feed slurry concentration is 3%–20%, and the maximum allowable feed particle size is ≤2mm; the underflow concentration without flocculant is 38%–45%, and the underflow concentration can reach 65% with the addition of 12g / t anionic flocculant and vibration operation, with a limiting underflow concentration of 75%; the slurry treatment flow rate range is 240–1200 m³ / h. 3 The corresponding dry tailings processing capacity is 40-105 t / h; the overflow turbidity is below 300 mg / L; the water recycling rate is not less than 75%; and the total slurry storage volume is approximately 120 m³.3 The equipment weighs approximately 14.9 tons.

[0027] Multi-stage slurry transfer supporting process Tailings from each grinding and beneficiation section are uniformly transported to the inclined plate pre-concentration via slurry pumps. The pre-concentration overflow is transported to a high-level water tank for temporary water storage for flotation. The pre-concentration underflow is sent to a linear screen and a dewatering screen to separate medium sand. The underflow slurry is returned to the inclined plate for secondary concentration. The secondary concentration overflow enters a fine-particle hydrocyclone for desliming and is then supplied to phosphorus flotation. All the secondary concentration underflow is sent to the magnetic recovery equipment.

[0028] Magnetic iron reflux process The tailings discharged from the phosphorus flotation process enter the magnetic separator for separation. The recovered magnetic iron concentrate is returned to the first stage of the BKY1545 magnetic separator in the third concentrator via wear-resistant pipeline for further recycling. The tailings from the magnetic separator are then screened by a fine sand screen. The slurry under the fine sand screen is sent to a thickener for concentration. The clear water from the top layer of the thickener is returned to each concentrator, while the high-concentration underflow is transported to the tailings dam or the resource recovery workshop.

[0029] Comparative Example 1: This comparative example uses the same tailings source, processing scale, and equipment configuration as Example 1, the only difference being that the magnetic recovery operation of phosphorus flotation tailings in step three is omitted (i.e., the four magnetic separators are not put into operation). The specific process is as follows: the phosphorus tailings slurry discharged from the phosphorus beneficiation workshop is sequentially screened for medium sand using a linear screen and dewatered using a dewatering screen. The undersize slurry does not pass through the magnetic separator and directly enters the tailings thickening workshop for fine sand screening. The undersize slurry from the fine sand screen is combined with the overflow from the fine-particle hydrocyclone and enters a φ33m thickener for thickening. The underflow from the thickener is pumped to the tailings dam, and the overflow water is recycled. Throughout the entire process, no residual magnetic iron minerals are recovered.

[0030] The effect of the treatment in Comparative Example 1: Because a magnetic recovery process was not implemented, all recoverable residual magnetic iron minerals in the phosphate tailings were fed into the thickener along with the slurry from the fine sand screen, and ultimately discharged into the tailings dam via underflow, resulting in permanent loss. Calculations showed that, compared to Example 1, Comparative Example 1 had a 0% residual magnetic iron recovery rate, an annual loss of 18,600 tons of iron concentrate, and a 4.06 percentage point decrease in the overall iron recovery rate of the mine. While the recovery volume of medium and fine sand and the water reuse rate remained the same as in Example 1, only the iron resource recovery process was completely ineffective, leading to permanent loss of metal resources and a significant reduction in economic benefits.

[0031] Comparative Example 2: This comparative example uses the same tailings source, processing scale, and magnetic separation, thickening, and water recycling equipment configuration as Example 1. The difference lies in the elimination of the medium sand screening and dewatering operation in step two and the fine sand screening and collection operation in step four. Specifically, the tailings slurry discharged from the phosphate beneficiation workshop is directly fed into the magnetic separator for residual iron recovery without any sand screening process. The magnetic separation tailings are also not subjected to fine sand screening; instead, they are directly fed into a φ33m thickener for thickening. The underflow from the thickener is pumped to the tailings dam, and the overflow water is recycled. Throughout the process, neither the coarse-grained medium sand nor the fine sand in the tailings is separated from the slurry; both are mixed with the fine-grained sludge and stored in the tailings dam.

[0032] The effect of the treatment in Comparative Example 2: Because the screening and separation process for medium and fine sand was eliminated, approximately 28,000 tons / year of medium and fine sand, which could have been stored separately or sold for comprehensive utilization, all entered the thickener's underflow and was ultimately discharged into the tailings dam. This resulted in: (1) The total annual tailings deposited into the storage facility was 1,322,600 tons, which is 482,200 tons more than the previous example, resulting in an additional consumption of 102,200 m³ of storage capacity per year. 3 This shortens the service life of tailings ponds; (2) The separation rate of medium sand and fine sand is 0. All 28,000 tons of medium sand and 74,200 tons of fine sand are stored in the warehouse. These sand resources with certain economic value cannot be recycled in stages and used as building materials, resulting in a serious waste of available resources. (3) The particle size composition of the materials entering the warehouse is wide, with fine sludge and coarse sand mixed together, which is not conducive to the graded construction and stability management of the tailings dam.

[0033] Although Comparative Example 2 retained magnetic recovery and water recycling, the lack of sand grading significantly reduced the tailings reduction and resource utilization effects.

[0034] Comparative Example 3 This comparative example uses the same tailings source, processing scale, and equipment configuration for medium sand screening and dewatering, magnetic sweeping recovery, fine sand screening, and thickening as Example 1. The difference lies in that the overflow water from the thickener in step six is ​​not recycled. Specifically, the overflow water from the φ33m thickener is no longer pumped to the Phase III high-level water tank for reuse in the concentrator production, but is directly discharged outside the plant area or treated as wastewater before being discharged. All process water required for grinding, magnetic separation, flotation, and other production processes in Baotong's first, second, and third concentrators is supplied by fresh water. The remaining steps (medium sand separation, magnetic sweeping recovery, fine sand screening, and underflow conveying) are the same as in Example 1.

[0035] The effect of the treatment in Comparative Example 3: Because the clarified water from the thickener could not be reused, the beneficiation plant's production relied entirely on fresh water, resulting in: (1) The utilization rate of mineral processing water is 27.3%, and the amount of new water replenishment is huge. Based on the scale of treating 1.3226 million tons of tailings per year, the amount of new water consumption is much higher than that in Example 1, resulting in serious waste of water resources, especially in arid and water-scarce areas, which leads to a significant increase in operating costs. (2) The discharge of a large amount of originally good quality clarified water not only increases the load and treatment cost of mineral processing wastewater discharge treatment facilities, but may also increase the environmental pressure on surrounding water bodies; (3) The closed loop of water circulation formed by the tailings pond clarification water and thickener overflow water is broken, the water balance of the concentrator is out of balance, which is not conducive to the construction of green mines and sustainable development.

[0036] Although Comparative Example 3 achieved iron recovery and sand classification, the lack of water recycling resulted in low utilization efficiency of mineral processing water, making it impossible to achieve the environmental protection goals of "zero discharge" or wastewater reduction.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for comprehensive recycling and utilization of tailings, characterized in that, Includes the following steps: S1. Tailings source and centralized transportation: The tailings from the first stage of magnetic separation, the tailings from the second and third stages of magnetic separation, the total tailings, the tailings from phosphorus beneficiation or scavenging are transported to the tailings treatment system via slurry pumps to form a centralized tailings slurry. S2, coarse-grained slag separation and medium sand dewatering: The tailings slurry is first screened by a linear screen. The medium sand on the screen enters a dewatering screen for dewatering, forming medium sand material that can be stored separately or used in a comprehensive manner. The slurry under the screen enters the subsequent inclined plate thickening and inclined plate overflow for fine particle treatment. S3. Magnetic scanning recovery of phosphorus flotation tailings: After fine-grained processing, the slurry enters the magnetic separation equipment to recover residual magnetic iron minerals, resulting in magnetic tailings and magnetic iron minerals. The magnetic iron minerals are returned to the iron concentrate system, magnetic separation system, or reprocessing process, while the magnetic tailings enter the tailings classification and concentration system. S4. Fine sand screening and collection: The slag-sweeping tailings enter the slag-separating and thickening workshop, where they are screened by a fine sand screen to separate fine sand. The fine sand is then conveyed by a belt to the fine sand stockpile for storage or further comprehensive utilization. S5, Fine-grained slurry concentration: The slurry that passes through the fine sand screen and the overflow from the fine-particle hydrocyclone enter the thickener for sedimentation and concentration; the underflow from the thickener is pumped to the tailings dam or subsequent comprehensive utilization stage. S6. Overflow water recycling: The overflow water from the thickener is pumped to a high-level water tank via an overflow pump or a return water pump, and then recycled to the grinding, magnetic separation, flotation and other production processes in the first, second and third concentrators.

2. The method for comprehensive recovery and utilization of tailings according to claim 1, characterized in that, The linear screen has a mesh size of 0.1-5mm and a processing capacity of 150-300 t / h per unit time. The linear screen uses a single-layer polyurethane screen, has a vibration frequency of 16.17Hz, an amplitude of 6-8mm, and an installation tilt angle of +2-+5°.

3. The method for comprehensive recovery and utilization of tailings according to claim 1, characterized in that, The dewatering screen has a screen aperture of 0.5 mm, a processing capacity of 55-80 t / h per unit time, a single-layer polyurethane screen, a vibration frequency of 16 Hz, an amplitude of 4-6 mm, an installation inclination angle of +3-+5° (uphill), and an output moisture content of 10%-14%.

4. The method for comprehensive recovery and utilization of tailings according to claim 1, characterized in that, The fine sand screen has a screen aperture of 0.5 mm, a processing capacity of 55-80 t / h per unit time, a single-layer polyurethane screen, a vibration frequency of 16 Hz, an amplitude of 4-6 mm, an installation inclination angle of +3-+5° (uphill), and an output moisture content of 10%-14%.

5. The method for comprehensive recovery and utilization of tailings according to claim 1, characterized in that, The thickener has an effective inclined plate settlement area of ​​800㎡. The inclined plates are made of polypropylene or fiberglass. The inclined plate installation angle is set at 45° and the plate spacing is 50mm. The thickener is equipped with a distributed inclined plate micro-vibration motor, a cone wall anti-blocking vibrator and a bottom discharge drive device. The total installed power of the whole machine is 7.5~9kW, the vibration mechanism speed is 960r / min, the vibration frequency is 16Hz and the micro-amplitude is 3mm.

6. The method for comprehensive recovery and utilization of tailings according to claim 5, characterized in that, The thickener is designed for a slurry concentration of 3%–20%, with a maximum allowable particle size of ≤2mm. Without flocculant, the underflow concentration is 38%–45%. With the addition of 12g / t anionic flocculant and vibration operation, the underflow concentration can reach 65%, with a limiting underflow concentration of 75%. The slurry treatment flow rate range is 240–1200 m³ / h. 3 The corresponding dry tailings processing capacity is 40-105 t / h; the overflow turbidity is below 300 mg / L; the water recycling rate is not less than 75%; and the total slurry storage volume is approximately 120 m³. 3 The equipment weighs approximately 14.9 tons.

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