Novel composite material for solid waste treatment of tailings and use method of novel composite material

Abstract

The invention discloses a novel composite material for tailing solid waste treatment and a use method, and belongs to the technical field of ore tailing treatment. A novel composite material for solid waste treatment of tailings comprises 65-80 parts of manganese tailings, 15-30 parts of common soil, 0.5-1 part of a manganese ion curing agent, 10-15 parts of cement and 7-10 parts of a P-type gelling agent. The novel composite material is obtained by crushing, neutralizing and drying the manganese tailings, adding the common soil, the manganese ion curing agent, the cement and the P-type gelling agent, and stirring and mixing, so that the problems of poor hardening property and water resistance are solved, the novel composite material meets the requirements of roadbed filling, large-scale application of the manganese tailings is realized, and the cost is reduced. And the method has remarkable economic and environmental benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of ore tailings treatment, and particularly to a new composite material for tailings solid waste treatment and a use method thereof. Background Art

[0002] Tailings are basically unusable waste left after mining. The accumulated tailings occupy a large amount of land and cause serious pollution to the surrounding environment, and thus urgently need to be treated. Comprehensive treatment of these tailings, turning solid waste into useful resources and eliminating the pollution of solid waste to the environment, is beneficial to the country and the people and conforms to the concepts of innovative development and green development.

[0003] Manganese ore is an extremely important mineral resource in China, with high utilization value and rich reserves. Manganese is a multi-valent element, and the formation of manganese minerals depends on environmental factors. In the primary zone of manganese deposits, most Mn exists in the form of Mn 2+ ions, while in the oxidation zone, it is mainly Mn 4+ . In the generally normal pH range (6 - 9) of natural waters, the dissolved manganese is mainly divalent manganese. Since the solubility of MnO2 is very low, relatively strict acidic conditions are required for leaching, and generally, dissolved tetravalent manganese cannot be detected in waters with pH = 3 - 10. And soluble manganese is toxic, and its discharge is strictly restricted, so it needs to be solidified.

[0004] Currently, the treatment of manganese tailings faces the following three main problems: First, the manganese content in manganese tailings slag is relatively low and varies, resulting in low extraction and utilization efficiency of manganese, and there may still be a pollution risk in the residue after utilization; second, for manganese ion solidification treatment methods such as calcination and ripening of manganese tailings slag, the energy consumption is high and the efficiency is low; finally, the application scenarios and dosages of existing treatment methods are limited, and it is difficult to effectively solve the problem of the utilization of manganese tailings slag.

[0005] However, generally speaking, the main components and particle gradation of manganese tailings slag make it have the potential to be used as special soil and are suitable for subgrade filling. If it can be treated and solidified at a low cost, it is expected to solve the disposal problem of manganese tailings slag on a large scale.

[0006] Nevertheless, there are still the following several challenges: First, the soluble form of manganese is toxic and easily causes environmental pollution, so it needs to be treated, but the methods such as solidification, passivation, and migration resistance are difficult and costly; second, when manganese tailings slag is directly filled, there are problems of poor compactness and water resistance.

[0007] Therefore, a new composite material for tailings solid waste treatment and a use method thereof are provided to solve the problems of poor compactness and water resistance and make it feasible for subgrade filling. Summary of the Invention

[0008] The object of the present invention is to solve the problems of poor hardening property and water resistance in the prior art, and to propose a new composite material for tailings solid waste treatment and its use method.

[0009] To achieve the above object, the present invention adopts the following technical solutions: A new composite material for tailings solid waste treatment, by weight, includes 65 - 80 parts of manganese tailings, 15 - 30 parts of ordinary soil, 0.5 - 1 part of manganese ion curing agent, 10 - 15 parts of cement, and 7 - 10 parts of P - type gelling agent.

[0010] In some embodiments, a new composite material for tailings solid waste treatment includes the following preparation steps: S1. Crush the manganese tailings into manganese tailings sand with a size of 1 - 2 mm, add an alkaline pH regulator to the manganese tailings sand, and the alkaline pH regulator accounts for 4 - 7% of the weight of the manganese tailings sand. After stirring evenly, let it stand for 4 - 6 hours; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 3% - 8%; S3. Add ordinary soil, manganese ion curing agent, cement, and P - type gelling agent to the dried manganese tailings sand, stir and mix to obtain a new composite material.

[0011] In some embodiments, the content of plain soil in the ordinary soil in S3 is not less than 40%, and the organic matter content does not exceed 5%. The cement is ordinary Portland cement with a strength grade not less than 42.5.

[0012] In some embodiments, the drying device in S2 includes a drying box fixed on the surface of a belt conveyor. The surface of the drying box is provided with a temperature regulating mechanism for real - time control of the moisture content of the dried tailings sand. The temperature regulating mechanism includes a temperature regulating mechanism for regulating the temperature in the drying box and a detection component for detecting the moisture content of the tailings sand on the surface of the conveyor belt. The temperature regulating mechanism includes a plurality of far - infrared heating tubes, a ventilation component, and an air inlet.

[0013] In some embodiments, a plurality of the far - infrared heating tubes are fixedly spaced on the inner top of the drying box, and a heat - collecting cover is arranged above the plurality of far - infrared heating tubes. The heat - collecting cover is fixed on the inner top of the drying box.

[0014] In some embodiments, the ventilation component includes air - collecting covers fixed on both sides of the drying box and a condensation box fixed on the top of the drying box. The two air - collecting covers are communicated with the inside of the drying box. The inside of the condensation box is divided into a dehumidification chamber and a heat - exchange chamber by a partition, and the heat - exchange chamber is located above the dehumidification chamber.

[0015] In some embodiments, a condenser is fixed on the surface of the partition plate, and a plurality of condensing pipes are fixed below the condenser. The air collecting hood is connected to the dehumidification chamber through a ventilation pipe. An air pump is fixed on the upper surface of the condensation box. The heat exchange chamber is connected to the top of the drying box through a plurality of connecting pipes, and the connecting positions are arranged at intervals. A plurality of fans are fixed on the inner top of the drying box.

[0016] In some embodiments, detection components are respectively arranged at both ends of the drying box. The detection components include a sampling mechanism for sampling the tailings sand on the surface of the conveyor belt and a moisture meter for detecting the sampled tailings sand.

[0017] In some embodiments, a plurality of the air inlets are respectively opened at the top of the drying box, and a plurality of the air inlets are respectively located above a plurality of fans. A cover plate for closing the air inlets slides on the upper surface of the drying box, and a plurality of the cover plates are driven to displace through driving push rods.

[0018] The present invention also provides a use method of a new composite material for tailings solid waste treatment as described in any one of the above, including the following steps: S1. Construction site preparation: Level the construction site, sweep the garbage and floating dust on the site, and clean the floating soil in the site to avoid affecting the bonding force between the roadbed and the base layer, and keep the site to be treated clean, flat, firm and dry; S2. Transport the prepared new composite material to the construction site by a transport vehicle, and use a roller to roll and level the new composite material. After it solidifies, a roadbed is formed. Compared with the prior art, the present invention provides a new composite material for tailings solid waste treatment and a use method, having the following beneficial effects.

[0019] 1. In the present invention, by crushing, neutralizing, drying manganese tailings and adding ordinary soil, manganese ion curing agent, cement and P-type gelling agent and stirring and mixing them, a new composite material is obtained, which solves the problems of poor hardenability and water resistance, enables it to meet the requirements for subgrade filling, realizes the large-scale application of manganese tailings slag, and has significant economic and environmental benefits.

[0020] 2. In the present invention, by using a drying device to control the moisture content of manganese tailings sand, it can ensure that the water content of the dried tailings sand remains within a set unified range, thereby improving the consistency and stability of the material. The unified water content helps to improve the bonding effect between the tailings sand and other materials, and further enhances the overall strength and stability of the subgrade, ensuring the quality and safety of the project.

[0021] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the positive axial structure of the drying device in the present invention.

[0023] Figure 2 It is a schematic diagram of the rear axial structure of the drying device in the present invention.

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the drying device in the present invention when viewed from above.

[0025] Figure 4 It is a structural schematic diagram of the far-infrared heating tube of the present invention.

[0026] Figure 5 It is a schematic diagram of the top cross-sectional structure of the drying device in the present invention.

[0027] Figure 6 It is a structural schematic diagram of the material turning component in the present invention.

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of the condensation box in the present invention.

[0029] Figure 8 It is a schematic diagram of the detection status structure of the detection component in the present invention.

[0030] Figure 9 It is a schematic diagram of the sampling state structure of the detection component in the present invention.

[0031] Figure 10 For the present invention Figure 9 Schematic diagram of the structure enlarged at point A in the middle.

[0032] In the figure: 1. Drying box; 2. Belt conveyor; 3. Far-infrared heating tube; 301. Energy gathering hood; 4. Material turning assembly; 401. Connecting shaft; 402. Material turning hopper; 403. Material blocking plate; 404. Synchronous transmission mechanism; 5. Ventilation assembly; 501. Gas collecting hood; 502. Condensation box; 503. Partition; 504. Condenser; 505. Condensation tube; 506. Air pump; 507. Fan; 508. Drain pipe; 6. Detection assembly; 601. Lifting rod; 602. Sampling tank; 603. Guide rod; 604. Slider; 605. Pull rope; 606. Push rod; 607. Moisture meter; 7. Air inlet; 8. Cover plate. DETAILED DESCRIPTION

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] Referring to Figures 1-10 , a new composite material for tailings solid waste treatment, by weight, includes: 65-80 parts of manganese tailings, 15-30 parts of ordinary soil, 0.5-1 part of manganese ion curing agent, 10-15 parts of cement, and 7-10 parts of P-type gelling agent; The preparation process is as follows: S1. Crush the manganese tailings into manganese tailings sand with a size of 1-2 mm. Add an alkaline pH regulator to the manganese tailings sand, and the alkaline pH regulator accounts for 4-7% of the weight of the manganese tailings sand. After stirring evenly, let it stand for 4-6 hours. The alkaline pH regulator is one of sodium hydroxide, calcium hydroxide, sodium bicarbonate, and calcium oxide. Since the manganese tailings are weakly acidic, adding an alkaline pH regulator neutralizes the acidity of the manganese tailings and provides an alkaline environment; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 3%-8%; S3. Add ordinary soil, manganese ion curing agent, cement, and P-type gelling agent to the dried manganese tailings sand, stir and mix to obtain a new composite material.

[0035] Among them, the content of plain soil in the ordinary soil is not less than 40%, and the organic matter content does not exceed 5%. The cement is ordinary Portland cement with a strength grade not less than 42.5.

[0036] Among them, the manganese ion curing agent is 50% sodium phosphate + 30% sulfur iron powder + 20% biochar.

[0037] Specifically, the drying device includes a drying box 1 fixed on the surface of the belt conveyor 2. The belt conveyor 2 is a V-shaped belt conveyor 2. A temperature regulating mechanism for real-time control of the moisture content of the dried tailings sand is arranged on the surface of the drying box 1. The temperature regulating mechanism includes a temperature regulating mechanism for regulating the temperature in the drying box 1 and a detection component 6 for detecting the moisture content of the tailings sand on the surface of the conveyor belt. The temperature regulating mechanism includes a plurality of far-infrared heating tubes 3, a ventilation component 5, and an air inlet 7; A plurality of far-infrared heating tubes 3 are spaced and fixed on the inner top of the drying box 1. A heat collecting cover 301 is arranged above the plurality of far-infrared heating tubes 3. The heat collecting cover 301 is fixed on the inner top of the drying box 1. The heat collecting cover 301 is a reflective cover with four sides bent inward and the bending direction downward, which is used to gather the heat energy generated by the far-infrared heating tubes to the surface of the tailings sand on the belt conveyor 2. Dust-proof curtains are arranged at both ends of the drying box 1.

[0038] It is understandable that since the water content in the tailings sand affects the bonding effect with other materials and ultimately affects the strength of the roadbed, and the initial water content in different batches of tailings sand is different (usually between 10% - 30%), using a unified drying temperature results in a large fluctuation in the water content of the dried tailings sand. By setting up a temperature adjustment mechanism, the drying temperature can be adjusted according to the initial water content of the tailings sand, so that the water content of the dried tailings sand is within a unified range. The unified water content helps to improve the bonding effect between the tailings sand and other materials, thereby enhancing the overall strength and stability of the roadbed, ensuring the quality and safety of the project. By setting up the belt conveyor 2, the tailings sand is conveyed. By setting up the temperature adjustment mechanism, it is convenient to adjust the temperature in the drying box 1 in real time and maintain the optimal moisture content of the tailings sand. Utilizing the significant characteristics of high intensity, high thermal efficiency, and high penetrability of the far-infrared heating tube 3, the tailings sand is heated quickly and evenly, causing the internal moisture to evaporate. Under the action of the energy-gathering cover 301, the heat generated by the far-infrared heating tube 3 is concentrated on the surface of the tailings sand, improving the heating effect. By setting up the dust-proof curtain, both ends of the drying box 1 are blocked, preventing a large amount of dust from escaping from the drying box 1 during drying and affecting the surrounding environment. Moreover, the dust-proof curtain can prevent a large amount of heat loss in the drying box 1, achieving a heat preservation effect.

[0039] Specifically, the ventilation component 5 includes air-collecting covers 501 fixed on both sides of the drying box 1 and a condensation box 502 fixed on the top of the drying box 1. The two air-collecting covers 501 are connected to the inside of the drying box 1, and a filtering device is arranged inside the two air-collecting covers 501. The filtering device is an activated carbon filter mesh. A partition 503 is horizontally fixed inside the condensation box 502. The partition 503 divides the condensation box 502 into a dehumidification chamber and a heat exchange chamber. The heat exchange chamber is located above the dehumidification chamber. A condenser 504 is fixed on the surface of the partition 503. Multiple condensation pipes 505 are fixed below the condenser 504. The heat dissipation part of the condenser 504 is located in the heat exchange chamber. The multiple condensation pipes 505 are vertically arranged in the dehumidification chamber. The air-collecting cover 501 is connected to the dehumidification chamber through a ventilation pipe. An air pump 506 is fixed on the upper surface of the condensation box 502. One end of the air inlet 7 of the air pump 506 is connected to the dehumidification chamber, and the other end of the air outlet of the air pump 506 is connected to the heat exchange chamber. The heat exchange chamber is connected to the top of the drying box 1 through multiple connecting pipes, and the connection positions are arranged at intervals. Multiple fans 507 are fixed on the top inside the drying box 1. The multiple fans 507 are respectively arranged between the multiple energy-gathering covers 301. The multiple fans 507 correspond to the connection positions of the connecting pipes and the drying box 1. A drain pipe 508 is fixed on the back of the condensation box 502. The drain pipe 508 is connected to the dehumidification chamber.

[0040] It can be understood that the air pump 506 works to evacuate the air in the dehumidification chamber, creating a negative pressure. Through the connecting pipe and the air collection hood 501, the moisture in the drying box 1 is evacuated. Under the action of the filtering device, harmful molecules in the moisture are adsorbed. The evacuated moisture enters the dehumidification chamber. The condenser 504 causes the surface of the condensing pipe 505 to generate a low temperature, condensing the moisture in the air onto the surface of the condensing pipe 505. The water droplets on the surface of the condensing pipe 505 gather and drip to the bottom of the dehumidification chamber and are discharged through the drain pipe 508. The air after dehumidification enters the heat exchange chamber. Since the evacuated moisture will carry a part of the heat, the condensing pipe 505 will cause the temperature of the air after dehumidification to decrease. When the condenser 504 works, it will generate a large amount of heat. The air after dehumidification can bring the heat generated by the condenser 504 into the drying box 1 to preheat the air entering the drying box 1, achieving the purpose of energy saving. At the same time, it can dissipate heat from the condenser 504. By discharging the moisture in the drying box 1, it is possible to prevent the moisture from being adsorbed on the surface of the tailings sand again, affecting the drying efficiency of the tailings sand. By setting the fan 507, the air entering the drying box 1 can be dispersed. At the same time, it can drive the air circulation in the drying box 1, quickly blowing away the moisture on the surface of the tailings sand and improving the drying efficiency.

[0041] Specifically, detection components 6 are respectively arranged at both ends of the drying box 1. The detection component 6 located at the front end of the drying box 1 is used to detect the initial moisture content of the tailings sand, and the detection component 6 located at the tail end of the drying box 1 is used to detect the moisture content of the dried tailings sand. The detection component 6 includes a sampling mechanism for sampling the tailings sand on the surface of the conveyor belt and a moisture meter 607 for detecting the sampled tailings sand. The moisture meter 607 is fixed on the top of the drying box 1. The moisture meter 607 adopts a capacitive moisture meter 607. The sampling mechanism includes a lifting rod 601 sliding on the surfaces of two guide rods 603 and a sampling tank 602 arranged on the surface of the lifting rod 601. The two guide rods 603 are fixed inside the drying box 1. The sampling tank 602 includes two half-tanks hinged to the lower surface of the lifting rod 601 and symmetrically arranged. Both half-tanks are rotatably connected to the lower surface of the lifting rod 601 through rotating shafts. A torsion spring for driving the two half-tanks to merge is arranged on the surfaces of multiple rotating shafts. A slider 604 slides on the lower surface of the lifting rod 601. The slider 604 is connected to the half-tank through a pull rope 605. The lower surface of the slider 604 is provided with an inclined surface that slopes upward towards the sampling tank 602. Push rods 606 matching the slider 604 are respectively fixed on both sides of the inner wall of the drying tank. A through hole corresponding to the sampling tank 602 is formed on the surface of the lifting rod 601. The moisture meter 607 corresponds to the through hole. The lifting rod 601 is lifted by driving the push rod 606. The lifting rod 601 is fixed on the top of the drying box 1.

[0042] It can be understood that by driving the push rod 606, the lifting rod 601 is driven to slide downward on the surface of the guide rod 603. When the lifting rod 601 drives the slider 604 to contact the push rod 606, the push rod 606 drives the slider 604 to slide in the direction away from the sampling tank 602. Under the action of the pull rope 605, the two halves of the tank body are separated by rotating the shaft. At this time, the half tank body has been inserted into the tailings sand on the surface of the conveyor belt. Then the lifting rod 601 is raised to separate the push rod 606 from the slider 604. Under the action of the torsion spring, the two halves of the tank body are driven to gradually merge. In this process, the two halves of the tank body grab a certain amount of tailings sand and then rise, so that the sampling tank 602 rises to the probe surface of the moisture meter 607. The moisture content of the tailings sand is detected by the moisture meter 607, and the drying temperature in the drying box 1 is adjusted in time according to the different moisture contents in the tailings sand; the tailings sand sample in the sampling tank 602 is sprinkled onto the surface of the conveyor belt during the next sampling.

[0043] Specifically, multiple air inlets 7 are respectively opened on the top of the drying box 1, and the multiple air inlets 7 are respectively located above the multiple fans 507. A cover plate 8 for closing the air inlet 7 is slidably provided on the upper surface of the drying box 1, and the multiple cover plates 8 are driven to move by the driving push rod 606.

[0044] It can be understood that by providing the air inlet 7, when the temperature in the drying box 1 needs to be quickly cooled down, the fan 507 can transport the outside normal temperature air into the drying box 1 through the air inlet 7, thereby quickly reducing the temperature in the drying box 1, and by driving the push rod 606 to drive the cover plate 8 to slide, the size of the air inlet 7 can be adjusted.

[0045] Specifically, the drying box 1 is provided with a plurality of turning components 4 for turning the tailings sand, the turning components 4 include a plurality of turning hoppers 402 arranged in a ring array on the surface of the connecting shaft 401, the turning hoppers 402 are in contact with the surface of the V-shaped conveyor belt during rotation, the connecting shaft 401 is rotatably connected to the inside of the drying box 1, the surface of the connecting shaft 401 is fixedly equipped with two material blocking plates 403, the two material blocking plates 403 are in contact with the two sides of the V-shaped conveyor belt, the plurality of turning components 4 are connected through a synchronous transmission mechanism 404, the synchronous transmission mechanism 404 includes a plurality of synchronous wheels fixedly mounted on one end of the connecting shaft 401, the plurality of synchronous wheels are connected through synchronous belt transmission, a plurality of extrusion wheels are rotatably connected around the synchronous wheel located in the middle of the drying box 1, the plurality of extrusion wheels are used to maintain the synchronous belt in a transmission relationship with the synchronous wheel located in the middle of the drying box 1, to improve its transmission angle, and to prevent the synchronous wheel located in the middle of the drying box 1 from being out of transmission relationship with the synchronous belt, the other end of one of the connecting shafts 401 is driven to rotate by a driving motor, and the driving motor is fixed to the back of the drying box 1.

[0046] It can be understood that by driving the connecting shaft 401 to rotate with the driving motor, under the cooperation of the synchronous pulley and the synchronous belt, multiple tipping buckets 402 are rotated. The rotation direction of the tipping bucket 402 is opposite to the conveying direction of the V-shaped conveyor belt. Under the cooperation of multiple tipping buckets 402 and the fitting relationship between the tipping bucket 402 and the conveyor belt, the tailings sand on the surface of the V-shaped conveyor belt is shoveled up, and the tailings are poured onto the surface of the V-shaped conveyor belt again as the tipping bucket 402 rotates, so as to turn the tailings sand on the conveyor belt surface multiple times, further improving the drying uniformity. At the same time, during the turning process, the moisture in the tailings sand can be quickly dissipated, improving the drying efficiency, enabling the conveyor belt to convey more tailings sand at the same time, and further improving the drying efficiency. By setting the baffle plate 403, the baffle plate 403 blocks both sides of the tipping bucket 402, which can prevent the tipping bucket 402 from spilling the tailings sand to both sides of the conveyor belt during rotation.

[0047] This embodiment also provides a method for using a new composite material for tailings solid waste treatment. Based on the above new composite material for tailings solid waste treatment, applying this new composite material to subgrade filling specifically includes the following steps: S1. Construction site preparation: Level the construction site, sweep the site garbage and floating dust, and clean the floating soil in the site to avoid affecting the bonding force between the subgrade and the base layer, and keep the site to be treated clean, flat, firm and dry; S2. Transport the prepared new composite material to the construction site by transport vehicle, and use a roller to roll and level the new composite material, and form a subgrade after it solidifies.

[0048] In addition, the new composite material for tailings solid waste treatment of the present invention provides the following specific implementation modes, and the parts are all parts by weight: Example 1: This embodiment provides a new composite material for tailings solid waste treatment, including: 70 parts of manganese tailings, 25 parts of ordinary soil, 0.9 part of manganese ion curing agent, 13 parts of cement, and 9 parts of P-type gelling agent; The preparation process is as follows: S1. Crush the manganese tailings into manganese tailings sand with a size of 1-2 mm, add an alkaline pH regulator to the manganese tailings sand, and the alkaline pH regulator accounts for 4.5% of the weight of the manganese tailings sand. After stirring evenly, let it stand for 4 hours. The alkaline pH regulator uses sodium hydroxide; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 4%; S3. Add ordinary soil, cement and P-type gelling agent to the dried manganese tailings sand and stir and mix to obtain a new composite material.

[0049] Example 2: This embodiment provides a new composite material for tailings solid waste treatment, including: 80 parts of manganese tailings, 16 parts of ordinary soil, 1 part of manganese ion curing agent, 10 parts of cement, and 8 parts of P-type gelling agent; The preparation process is as follows: S1. Crush the manganese tailings into manganese tailings sand with a size of 1 - 2 mm. Add an alkaline pH regulator to the manganese tailings sand, and the alkaline pH regulator accounts for 7% of the weight of the manganese tailings sand. After stirring evenly, let it stand for 5 hours. The alkaline pH regulator is calcium hydroxide; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 8%; S3. Add ordinary soil, cement, and P-type gelling agent to the dried manganese tailings sand, stir and mix to obtain the new composite material.

[0050] Example 3: This embodiment provides a new composite material for tailings solid waste treatment, including: 77 parts of manganese tailings, 20 parts of ordinary soil, 0.8 part of manganese ion curing agent, 14 parts of cement, and 8 parts of P-type gelling agent; The preparation process is as follows: S1. Crush the manganese tailings into manganese tailings sand with a size of 1 - 2 mm. Add an alkaline pH regulator to the manganese tailings sand, and the alkaline pH regulator accounts for 6% of the weight of the manganese tailings sand. After stirring evenly, let it stand for 6 hours. The alkaline pH regulator is sodium bicarbonate; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 6%; S3. Add ordinary soil, cement, and P-type gelling agent to the dried manganese tailings sand, stir and mix to obtain the new composite material.

[0051] Comparative example: This embodiment provides a new composite material for tailings solid waste treatment, including: 65 parts of manganese tailings, 30 parts of ordinary soil, 0.5 part of manganese ion curing agent, 14 parts of cement, and 7 parts of P-type gelling agent; The preparation process is as follows: S1. Crush the manganese tailings into manganese tailings sand with a size of 1 - 2 mm. Add an alkaline pH regulator to the manganese tailings sand, and the alkaline pH regulator accounts for 4% of the weight of the manganese tailings sand. After stirring evenly, let it stand for 4 hours. The alkaline pH regulator is calcium oxide; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 3%; S3. Add ordinary soil, cement, and P-type gelling agent to the dried manganese tailings sand, stir and mix to obtain the new composite material.

[0052] According to relevant specifications and test procedures, the performance of the new composite materials obtained in the above examples when used in the roadbed was detected, and the test results are as follows in the table: As can be seen from the test results in the above table, the new composite materials of each embodiment of the present invention have good performance, and all indicators meet the requirements for subgrade filling. Compared with Example 3, the 7-day compressive strength and CBR value of the comparative example are significantly reduced, and the Mn 2+ leaching concentration is significantly higher, exceeding the leaching emission limit of 2 mg / L, verifying the effectiveness of the present invention in subgrade filling.

[0053] In the present invention, manganese tailings are crushed into manganese tailings sand with a size of 1-2 mm. An alkaline pH regulator is added to the manganese tailings sand, and after stirring evenly, it is left standing for 4-6 hours. Since the manganese tailings are weakly acidic, the addition of the alkaline pH regulator neutralizes the acidity of the manganese tailings and provides an alkaline environment. Then, the manganese tailings sand is conveyed to a drying device for drying. During drying, the tailings sand is conveyed into the drying box 1 through the belt conveyor 2 for drying. The far-infrared heating tube 3 is used to heat the tailings sand quickly and evenly, so that the internal moisture evaporates. The air in the dehumidification chamber is evacuated by the air pump 506 to create a negative pressure, and the moisture in the drying box 1 is evacuated into the dehumidification chamber through the connecting pipe and the air collecting hood 501. The surface of the condensing pipe 505 is cooled by the condenser 504 to condense the moisture in the moisture into the surface of the condensing pipe 505 to achieve the purpose of dehumidification. The dehumidified air can bring the heat generated by the condenser 504 into the drying box 1 to preheat the air entering the drying box 1, achieving the purpose of energy saving. Under the action of the fan 507, the air entering the drying box 1 is dispersed. At the same time, it can drive the air circulation in the drying box 1 to quickly disperse the moisture on the surface of the tailings sand and improve the drying efficiency. During the drying process, the detection component 6 at the front end of the drying box 1 detects the initial moisture content of the tailings sand at regular intervals. When the moisture content is greater than the threshold value of each stage, the power of the far-infrared heating tube 3 is increased to raise the temperature in the drying box 1 for rapid drying. When the moisture content is less than the threshold value of each stage, the power of the far-infrared heating tube is reduced. At the same time, the cover plate 8 opens the air inlet 7, and the normal-temperature air from the outside is conveyed into the drying box 1 through the fan 507, so as to quickly reduce the temperature in the drying box 1 and reduce the drying effect. The detection component 6 at the rear end of the drying box 1 detects the moisture content of the dried tailings sand and timely feedbacks the drying effect. By timely controlling the increase and decrease of the temperature in the drying box 1, the moisture content of different batches of tailings sand is maintained within the optimal range, thereby improving the consistency and stability of the material. The uniform moisture content helps to improve the bonding effect between the tailings sand and other materials, and further enhances the overall strength and stability of the roadbed, ensuring the quality and safety of the project. Ordinary soil, manganese ion curing agent, cement and P-type gelling agent are added to the dried manganese tailings sand and stirred and mixed to obtain a new composite material. By crushing, neutralizing, drying the manganese tailings and adding ordinary soil, manganese ion curing agent, cement and P-type gelling agent and stirring and mixing, the problems of poor hardening and water resistance are solved, making it meet the requirements for subgrade filling, realizing the large-scale application of manganese tailings slag, and having significant economic and environmental benefits. The prepared new composite material is transported to the construction site by a transport vehicle, and a roller is used to roll and level the new composite material. After it solidifies, a roadbed is formed.As described above, the above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0054] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel composite material for tailings solid waste treatment, characterized in that, By weight, it includes 65 - 80 parts of manganese tailings, 15 - 30 parts of ordinary soil, 0.5 - 1 part of manganese ion solidifying agent, 10 - 15 parts of cement, and 7 - 10 parts of P - type gelling agent.

2. The novel composite material for tailings solid waste treatment according to claim 1, wherein, It includes the following preparation steps: S1. Crush the manganese tailings into manganese tailings sand with a size of 1 - 2 mm, add an alkaline pH regulator to the manganese tailings sand, the alkaline pH regulator accounts for 4 - 7% of the weight of the manganese tailings sand, stir evenly and then stand for 4 - 6 hours; S2. Use a drying device to dry the manganese tailings sand, and the water content of the dried manganese tailings sand is 3% - 8%; S3. Add ordinary soil, manganese ion solidifying agent, cement and P - type gelling agent to the dried manganese tailings sand, stir and mix to obtain a new composite material.

3. The novel composite material for tailings solid waste treatment according to claim 2, wherein In the ordinary soil in S3, the content of plain soil is not less than 40%, and the organic matter content does not exceed 5%. The cement is ordinary portland cement with a strength grade not less than 42.

5.

4. A novel composite material for tailings solid waste treatment according to claim 2, characterized in that, In S2, the drying device includes a drying box (1) fixed on the surface of a belt conveyor (2). A temperature regulating mechanism for real - time controlling the water content of the dried tailings sand is arranged on the surface of the drying box (1). The temperature regulating mechanism includes a temperature regulating mechanism for regulating the temperature in the drying box (1) and a detection component (6) for detecting the water content of the tailings sand on the surface of the conveyor belt. The temperature regulating mechanism includes a plurality of far - infrared heating tubes (3), a ventilation component (5) and an air inlet (7).

5. A novel composite material for tailings solid waste treatment according to claim 4, characterized in that, A plurality of the far - infrared heating tubes (3) are spaced and fixed on the inner top of the drying box (1). A heat - collecting cover (301) is arranged above the plurality of far - infrared heating tubes (3), and the heat - collecting cover (301) is fixed on the inner top of the drying box (1).

6. The novel composite material for tailings solid waste treatment according to claim 4, characterized in that, The ventilation component (5) includes air - collecting covers (501) fixed on both sides of the drying box (1) and a condensation box (502) fixed on the top of the drying box (1). The two air - collecting covers (501) are communicated with the inside of the drying box (1). The inside of the condensation box (502) is divided into a dehumidification chamber and a heat - exchange chamber by a partition board (503), and the heat - exchange chamber is located above the dehumidification chamber.

7. According to a new composite material for tailings solid waste treatment described in claim 6, a condenser (504) is fixed on the surface of the partition board (503), and a plurality of condensation tubes (505) are fixed below the condenser (504). The air - collecting cover (501) is communicated with the dehumidification chamber through a ventilation pipe. An air pump (506) is fixed on the upper surface of the condensation box (502). The heat - exchange chamber is communicated with the top of the drying box (1) through a plurality of connecting pipes, and the connecting positions are arranged at intervals. A plurality of fans (507) are fixed on the inner top of the drying box (1).

8. A novel composite material for tailings solid waste treatment according to claim 4, characterized in that, Detection components (6) are respectively arranged at both ends of the drying box (1). The detection component (6) includes a sampling mechanism for sampling the tailings sand on the surface of the conveyor belt and a moisture meter (607) for detecting the sampled tailings sand.

9. The novel composite material for tailings solid waste treatment according to claim 4, characterized in that, A plurality of the air inlets (7) are respectively opened at the top of the drying box (1), and the plurality of air inlets (7) are respectively located above a plurality of fans (507). A cover plate (8) for closing the air inlets (7) slides on the upper surface of the drying box (1), and the plurality of cover plates (8) are driven to displace by a driving push rod (606).

10. The usage method of a new composite material for tailings solid waste treatment according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Construction site preparation: Level the construction site, sweep the garbage and floating dust on the site, and clean the floating soil in the site to avoid affecting the bonding force between the roadbed and the base course, and keep the site to be treated clean, flat, firm and dry; S2. Transport the prepared new composite material to the construction site by a transport vehicle, and use a roller to roll and level the new composite material, and form a roadbed after it solidifies.

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