Device for mine solid waste slope treatment and carbon dioxide collaborative storage

Abstract

The utility model belongs to the technical field of mine solid waste slope treatment and carbon dioxide storage, and particularly relates to a device for mine solid waste slope treatment and carbon dioxide collaborative storage, which comprises a calcium hydroxide slurry stirrer, a carbon dioxide gas storage tank, a calcium hydroxide injection main pipe and a carbon dioxide injection main pipe, one end of the calcium hydroxide injection main pipe is connected with a calcium hydroxide slurry stirrer, and the other end of the calcium hydroxide injection main pipe is connected with a calcium hydroxide slope surface injection hose which is connected with an injection anchor pipe in a waste residue and tailing pile body side slope so as to inject calcium hydroxide slurry into the injection anchor pipe; one end of the carbon dioxide injection main pipe is connected with a carbon dioxide gas storage tank, and the other end of the carbon dioxide injection main pipe is connected with a carbon dioxide slope injection hose used for being connected with an injection anchor pipe in a waste residue and tailing pile body slope to inject carbon dioxide gas into the injection anchor pipe. By means of the device, release of heavy metal can be avoided, meanwhile, carbon dioxide is stably sealed in waste residues and tailings, and finally cooperative treatment of mine solid waste slope treatment and carbon dioxide sealing is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine solid waste slope management and carbon dioxide sealing, and specifically relates to a device for mine solid waste slope management and carbon dioxide coordinated sealing. Background Art

[0002] Mining operations often produce a large amount of mining waste or tailings, which are piled up in disorder and exposed on the slopes of mines. Under atmospheric rainfall leaching, they will release pollutants to produce sewage and wastewater, which will affect the surrounding surface water and groundwater environment, occupy land resources, and damage the local ecological environment. The existing geological disaster risks may also endanger surrounding residents at any time. The commonly used treatment method is to use anchor rods to reinforce the slope of the waste tailings pile, and to carry out anti-seepage treatment on the surface of the slope to reduce the entry of water into the waste tailings pile. At the same time, in order to achieve source control, relevant repair agents are usually added. However, if excavation and mixing are used, it will cause greater disturbance to the original slope, increase the difficulty and danger of construction, and it is not easy to backfill and compact, and the workload is huge.

[0003] The storage of carbon dioxide is a key technology to achieve carbon neutrality. At present, the storage technologies of carbon dioxide mainly include geological storage and marine storage. By capturing carbon dioxide, selecting a specific storage site, and injecting carbon dioxide through injection wells, the carbon dioxide in the atmosphere is reduced. However, in-depth drilling work is required to find a suitable storage site, which leads to a high cost of carbon dioxide storage. Utility Model Content

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a device for mine solid waste slope management and coordinated storage of carbon dioxide, which can realize the coordinated treatment of in-situ mine slope management and carbon dioxide storage, while reducing the excavation disturbance to the mine slope and reducing the cost of carbon dioxide storage.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is a device for mine solid waste slope management and coordinated carbon dioxide sealing, characterized in that: it includes a calcium hydroxide slurry agitator, a carbon dioxide gas storage tank, a calcium hydroxide injection main pipe and a carbon dioxide injection main pipe; one end of the calcium hydroxide injection main pipe is connected to the calcium hydroxide slurry agitator, and the other end is connected to a calcium hydroxide slope injection hose for connecting to an injection anchor pipe in the waste tailings pile slope to inject calcium hydroxide slurry therein; one end of the carbon dioxide injection main pipe is connected to the carbon dioxide gas storage tank, and the other end is connected to a carbon dioxide slope injection hose for connecting to an injection anchor pipe in the waste tailings pile slope to inject carbon dioxide gas therein.

[0006] As one of the implementation modes, the calcium hydroxide slurry agitator and the carbon dioxide gas storage tank are both arranged in a flat area in front of the slope of the waste tailings pile.

[0007] As one of the embodiments, a first movable pipe support is provided in the flat area in front of the slope of the waste tailings pile, and the bottom of the calcium hydroxide injection main pipe and the carbon dioxide injection main pipe are movably supported in the flat area in front of the slope of the waste tailings pile by the first movable pipe support.

[0008] As one of the implementation modes, a second movable pipe support is provided on each grading platform of the waste tailings pile slope, the top of the calcium hydroxide injection main pipe and the carbon dioxide injection main pipe extend toward the top of the slope, and are movably supported on each grading platform of the waste tailings pile slope by the second movable pipe support at the position of each grading platform.

[0009] As one of the implementation modes, the calcium hydroxide injection main pipe is connected to the calcium hydroxide slope injection hose at the position of each grading platform; the carbon dioxide injection main pipe is connected to the carbon dioxide slope injection hose at the position of each grading platform.

[0010] As one of the implementation modes, the diameters of the calcium hydroxide slope injection hose and the carbon dioxide slope injection hose are matched with the diameter of the injection anchor pipe.

[0011] As one of the implementation modes, a slurry pump is provided in the calcium hydroxide slurry agitator, and a slurry outlet of the slurry pump is connected to the calcium hydroxide injection main pipe.

[0012] As one of the implementation modes, a gas one-way valve is provided on the carbon dioxide injection main pipe.

[0013] As one of the implementation modes, the gas one-way valve is close to the gas outlet of the carbon dioxide gas storage tank.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The device of the utility model can inject calcium hydroxide slurry and carbon dioxide gas into the waste tailings pile, so that the calcium hydroxide slurry fully adheres to the surface of the waste tailings, and reacts with the carbon dioxide to form a passivation layer to wrap the waste tailings, so that the waste tailings are isolated from oxygen and water, and the release of heavy metal pollution is cut off from the source, and the carbon dioxide geological mineralization is sealed in the waste tailings. The device does not have any restrictions on the type of solid waste, and does not require high-cost off-site construction of a mine solid waste storage site, nor does it require additional artificial space transformation to seal carbon dioxide; it avoids a large amount of excavation disturbance on the slope of the mine waste tailings, reduces the amount of excavation and backfilling, and also improves economic and environmental benefits, achieving the dual purpose of in-situ control of the slope of the mine waste tailings and stabilization and sealing of carbon dioxide in one fell swoop. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a device for mine solid waste slope management and carbon dioxide coordinated storage provided by an embodiment of the utility model;

[0018] In the figure: 101, original topography of the pile; 102, slope surface after slope cutting and shaping; 103, grading platform; 104, waste slag tailings pile; 105, underlying bedrock; 106, anchor injection anchor pipe; 107, structural injection anchor pipe; 108, carbon dioxide gas storage tank; 109, gas one-way valve; 110, calcium hydroxide slurry agitator; 111, slurry pump; 112, first mobile pipeline support; 113, second mobile pipeline support; 114, calcium hydroxide injection main pipe; 115, calcium hydroxide slope injection hose; 116, carbon dioxide injection main pipe; 117, carbon dioxide slope injection hose. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0022] like Figure 1 As shown, this embodiment provides a device for mine solid waste slope management and carbon dioxide coordinated sealing, characterized in that it includes a calcium hydroxide slurry agitator 110, a carbon dioxide gas storage tank 108, a calcium hydroxide injection pipe 114 and a carbon dioxide injection pipe 116; one end of the calcium hydroxide injection pipe 114 is connected to the calcium hydroxide slurry agitator 110, and the other end is connected to a calcium hydroxide slope injection hose 115 for connecting to an injection anchor pipe in the waste tailings pile slope to inject calcium hydroxide slurry therein; one end of the carbon dioxide injection pipe 116 is connected to the carbon dioxide gas storage tank 108, and the other end is connected to a carbon dioxide slope injection hose 117 for connecting to an injection anchor pipe in the waste tailings pile slope to inject carbon dioxide gas therein. The device of this embodiment can inject calcium hydroxide slurry and carbon dioxide gas into the waste tailings pile, so that the calcium hydroxide slurry fully adheres to the surface of the waste tailings, and reacts with carbon dioxide to form a passivation layer to wrap the waste tailings, so as to isolate the waste tailings from contact with oxygen and water bodies, prevent the generation of waste tailings leaching wastewater from the source, and seal the carbon dioxide geological mineralization in the waste tailings. The device does not have any restrictions on the type of solid waste, and does not require high-cost off-site construction of mine solid waste storage sites, nor does it require additional artificial transformation of space to seal carbon dioxide; it avoids a large amount of excavation disturbance on the slope of mine waste tailings, reduces the amount of excavation and backfilling, and also improves economic and environmental benefits, achieving the dual purpose of in-situ control of the slope of mine waste tailings and stabilization and sealing of carbon dioxide in one fell swoop.

[0023] In this embodiment, the calcium hydroxide slurry agitator 110 and the carbon dioxide gas storage tank 108 are both arranged in a flat area in front of the slope of the waste tailings pile. The lengths of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116 are set according to requirements.

[0024] Furthermore, a first movable pipe support 112 is provided in the flat area in front of the slope of the waste tailings pile, and the bottoms of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116 are movably supported in the flat area in front of the slope of the waste tailings pile through the first movable pipe support 112. The first movable pipe support 112 can move left and right facing the slope surface, and when the injection position of the calcium hydroxide slurry and the carbon dioxide gas needs to be adjusted, the first movable pipe support 112 can be moved left and right to adjust the position and extension direction of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116.

[0025] Furthermore, each grading platform 103 of the waste tailings pile slope is provided with a second movable pipe support 113, and the tops of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116 extend toward the top of the slope, and are movably supported on each grading platform 103 of the waste tailings pile slope by the second movable pipe support 113 at the position of each grading platform 103. The second movable pipe support 113 can move left and right facing the slope surface, and when the injection position of the calcium hydroxide slurry and the carbon dioxide gas needs to be adjusted, the second movable pipe support 113 moves in coordination with the first movable pipe support 112, thereby realizing accurate adjustment of the positions of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116.

[0026] In one embodiment, the calcium hydroxide injection pipe 114 is connected to the calcium hydroxide slope injection hose 115 at the position of each grading platform 103; the carbon dioxide injection pipe 116 is connected to the carbon dioxide slope injection hose 117 at the position of each grading platform 103. Specifically, each injection pipe can be connected to only one corresponding slope injection hose at the position of each grading platform 103, or can be connected to multiple slope injection hoses at the same time, and a valve can be set on each slope injection hose.

[0027] In this embodiment, the diameters of the calcium hydroxide slope injection hose 115 and the carbon dioxide slope injection hose 117 are matched with the diameter of the injection anchor pipe. By sleeve the end of the slope injection hose on the end of the injection anchor pipe, the injection anchor pipe is connected with the calcium hydroxide slurry agitator 110 or the carbon dioxide gas storage tank 108, so as to inject calcium hydroxide slurry and carbon dioxide gas into the waste tailings pile.

[0028] Among them, the injection anchor includes an anchor injection anchor pipe 106 and a structural injection anchor pipe 107. The anchor injection anchor pipe 106 is driven into the position where the slope needs to be stable, and the structural injection anchor pipe 107 is driven into the position where only the hanging net requirement is required. The pipe sections of the anchor injection anchor pipe 106 and the structural injection anchor pipe 107 located within the waste tailings pile 104 are opened in a plum blossom shape. The anchor injection anchor pipe 106 and the structural injection anchor pipe 107 are distributed on the slope surface according to 2m×2m as a whole, part of which is used as the injection point of calcium hydroxide slurry, and part of which is used as the injection point of carbon dioxide gas, and the injection point of calcium hydroxide slurry and the injection point of carbon dioxide gas are arranged at intervals in the same row, and staggered in adjacent rows to ensure that the calcium hydroxide slurry and carbon dioxide gas are fully in contact and react.

[0029] Furthermore, the diameter of the calcium hydroxide slope injection hose 115 is smaller than the diameter of the calcium hydroxide injection main pipe 114, and the diameter of the carbon dioxide slope injection hose 117 is smaller than the diameter of the carbon dioxide injection main pipe 116. Since the slope injection hose has a different diameter than the corresponding injection main pipe, the pressure can be increased, and the injection pressure of the slope injection hose is guaranteed to be between 0.5 and 1.2 MPa.

[0030] Furthermore, a slurry pump 111 is provided in the calcium hydroxide slurry agitator 110, and the slurry outlet of the slurry pump 111 is connected to the calcium hydroxide injection main pipe 114. Figure 1 As shown, the end of the calcium hydroxide injection main pipe 114 extends into the calcium hydroxide slurry agitator 110 and is connected to the slurry outlet of the slurry pump 111; the slurry pump 111 selects the head and power according to the conveying distance, height difference, and slurry characteristics.

[0031] In this embodiment, the calcium hydroxide slurry agitator 110 is made of a material that is easy to dissipate heat, so that the heat generated by the preparation of the calcium hydroxide slurry is dissipated in time to ensure that the temperature inside the agitator is not too high; and the top of the calcium hydroxide slurry agitator can be sealed to reduce contact with carbon dioxide in the air during the reaction process.

[0032] To optimize the above embodiment, a gas one-way valve 109 is provided on the carbon dioxide injection main pipe 116. Further, the gas one-way valve 109 is close to the gas outlet of the carbon dioxide gas storage tank 108. By providing the gas one-way valve 109 at a position close to the gas outlet of the carbon dioxide gas storage tank 108 on the carbon dioxide injection main pipe 116, carbon dioxide gas can be injected into the carbon dioxide injection main pipe 116 after the valve is opened, but cannot flow back.

[0033] The process of using the device of this embodiment to carry out mine solid waste slope management and carbon dioxide synergistic storage is as follows:

[0034] First, the waste tailings pile is shaped by cutting the slope, and the slope rate is set according to the slope stability calculation. The original terrain 101 of the pile is built with a grading platform 103 at intervals of 5-10m from top to bottom. The upper slope of the step is shaped by taking the designed slope 102 after the slope cutting as the reference. After shaping, the risk of slope instability of the disorderly stored waste tailings pile 104 is reduced, and the stability of the slope is ensured as much as possible.

[0035] In order to ensure the complete stability of the slope, the waste tailings pile 104 is rammed into the underlying bedrock 105 by anchoring anchor pipes, and the ramming depth is determined according to the stability calculation; in view of the relatively loose accumulation characteristics of the waste tailings, the use of anchor pipe casing construction can avoid collapse, and the anchor pipe needs to be opened in a plum blossom shape, which is simultaneously used as an anchor injection anchor pipe 106 for injecting calcium hydroxide slurry and / or carbon dioxide gas, realizing multiple functions of anchoring, grouting, and gas injection;

[0036] When the slope of the pile is sprayed and sealed, a 3m structural anchor pipe needs to be driven into the slag pile to hang the net. The structural anchor pipe also needs a plum blossom-shaped hole, which is simultaneously used as a structural injection anchor pipe 107 for injecting calcium hydroxide slurry and / or carbon dioxide gas; the slope surface that has been rammed with the anchor injection anchor pipe 106 does not need to be repeatedly laid with structural anchor pipes;

[0037] The length of the anchor injection anchor pipe 106 is determined according to the slope stability calculation. The plum blossom-shaped opening sections of the anchor injection anchor pipe 106 and the structural injection anchor pipe 107 are mainly located within the waste tailings pile 104, so that the injected calcium hydroxide slurry and carbon dioxide gas diffuse in the waste tailings pile 104 with high permeability and cover the surface of the waste tailings particles after geological calcification.

[0038] After the anchoring injection anchor pipe 106 and the structural injection anchor pipe 107 are driven vertically into the slope surface as a whole according to the slope surface spacing of 2m×2m, a net is hung on the anchoring injection anchor pipe 106 and the structural injection anchor pipe 107, and the slope surface of the pile body is sprayed and sealed with C30 anti-corrosion, anti-seepage and early-strength concrete with a thickness of 10-15cm to form an anti-leakage layer on the top, which can not only prevent rainfall from entering the waste tailings, but also prevent carbon dioxide gas from escaping during subsequent injection;

[0039] A calcium hydroxide slurry agitator 110 and a carbon dioxide gas storage tank 108 are fixed on a flat area in front of the slope of the waste tailings pile, and a calcium hydroxide injection main pipe 114 is connected to a slurry pump 111 in the calcium hydroxide slurry agitator 110, and a carbon dioxide injection main pipe 116 is connected to the gas outlet of the carbon dioxide gas storage tank 108;

[0040] A first movable pipe support 112 is arranged in a flat area in front of the side slope of the waste tailings pile, and a second movable pipe support 113 is arranged on each grading platform 103, and the bottom of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116 are fixed on the first movable pipe support 112, and the top of the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116 are extended toward the top of the slope, and the positions corresponding to each grading platform 103 are fixed on the second movable pipe support 113 on the corresponding platform, and then the calcium hydroxide injection pipe 114 and the carbon dioxide injection pipe 116 are connected to the anchor injection anchor pipe 106 and / or the structural injection anchor pipe 107 through the calcium hydroxide slope injection hose 115 and the carbon dioxide slope injection hose 117 respectively;

[0041] Calcium hydroxide slurry is prepared by mixing calcium oxide and water in a molar mass ratio of 1:1, and the amount is calculated according to the treatment depth, grouting range and porosity, taking into account the porosity of the waste tailings slope after shaping and compaction and the distance between the injection pipes, and then added into the calcium hydroxide slurry agitator 110 for stirring to produce calcium hydroxide slurry;

[0042] When the spray-mixed layers of each level of slope surface have been consolidated to a certain strength, calcium hydroxide slurry and carbon dioxide gas are simultaneously injected through different anchor injection anchor pipes 106 and / or structural injection anchor pipes 107, so as to avoid the difficulty in good injection and diffusion into the pores of the waste tailings after the two are mixed to form a precipitate before injection; once carbon dioxide reacts with calcium hydroxide to produce calcium carbonate precipitate attached to the waste tailings, carbon dioxide will not leak, so there is no need to conduct subsequent carbon dioxide gas leakage monitoring; the molar mass ratio of carbon dioxide to calcium hydroxide is 1:1, and attention should be paid to controlling the injection flow rate during grouting, so as to allow the slurry to penetrate into the pores of the waste tailings accumulation as much as possible, and to allow carbon dioxide to fully diffuse and react with the calcium hydroxide attached to the surface of the waste tailings to form a calcium carbonate precipitate, so that the substance wraps the waste tailings as a stable passivation layer; the injection amount of carbon dioxide needs to ensure that the calcium hydroxide slurry reacts completely with the carbon dioxide;

[0043] After the calcium hydroxide slurry to be injected has completely infiltrated, C30 anti-corrosion and anti-seepage cement mortar is injected into the anchor injection anchor pipe 106 and the structural injection anchor pipe 107 to seal the holes. Finally, the surface of the pile is sprayed to eliminate obvious gaps on the sprayed mixed surface.

[0044] Through the above method, the waste tailings on the mine slope are covered and wrapped by the stable geological mineralization products of carbon dioxide to isolate them from contact with oxygen and water, avoiding the release of heavy metals. At the same time, the geological mineralization of carbon dioxide is sealed in the waste tailings, and there is no leakage problem of the sealed carbon dioxide. Ultimately, the coordinated disposal of mine solid waste slope management and carbon dioxide coordinated storage is achieved, providing a new solution to the environmental problems caused by solid waste left over from mining and carbon dioxide greenhouse gases discarded by enterprises. The storage of carbon dioxide is closely combined with mine solid waste management and environmental protection projects to achieve the dual ecological and environmental benefits of carbon reduction and environmental protection.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for mining solid waste slope management and carbon dioxide synergistic storage, characterized by: The invention comprises a calcium hydroxide slurry agitator, a carbon dioxide gas storage tank, a calcium hydroxide injection pipe and a carbon dioxide injection pipe; one end of the calcium hydroxide injection pipe is connected to the calcium hydroxide slurry agitator, and the other end is connected to a calcium hydroxide slope injection hose for connecting to an injection anchor pipe in a waste tailings pile slope to inject calcium hydroxide slurry therein; one end of the carbon dioxide injection pipe is connected to the carbon dioxide gas storage tank, and the other end is connected to a carbon dioxide slope injection hose for connecting to an injection anchor pipe in a waste tailings pile slope to inject carbon dioxide gas therein.

2. The device for mining solid waste slope management and carbon dioxide synergistic storage as claimed in claim 1, characterized in that: The calcium hydroxide slurry agitator and the carbon dioxide gas storage tank are both arranged in a flat area in front of the slope of the waste slag tailings pile.

3. The device for mining solid waste slope management and carbon dioxide synergistic storage as claimed in claim 2, characterized in that: A first movable pipe support is provided in the flat area in front of the slope of the waste tailings pile, and the bottoms of the calcium hydroxide injection main pipe and the carbon dioxide injection main pipe are movably supported in the flat area in front of the slope of the waste tailings pile through the first movable pipe support.

4. The device for mining solid waste slope management and carbon dioxide synergistic storage as claimed in claim 3, characterized in that: A second movable pipe support is provided on each grading platform of the waste tailings pile slope, and the tops of the calcium hydroxide injection main pipe and the carbon dioxide injection main pipe extend toward the top of the slope, and are movably supported on each grading platform of the waste tailings pile slope by the second movable pipe support at the position of each grading platform.

5. The device for mining solid waste slope management and carbon dioxide coordinated storage as claimed in claim 1, characterized in that: The calcium hydroxide injection main pipe is connected to the calcium hydroxide slope injection hose at the position of each grading platform; the carbon dioxide injection main pipe is connected to the carbon dioxide slope injection hose at the position of each grading platform.

6. The device for mining solid waste slope management and carbon dioxide coordinated storage as claimed in claim 1, characterized in that: The diameters of the calcium hydroxide slope injection hose and the carbon dioxide slope injection hose both match the diameter of the injection anchor pipe.

7. The device for mining solid waste slope management and carbon dioxide synergistic storage as claimed in claim 1, characterized in that: A slurry pump is arranged in the calcium hydroxide slurry agitator, and a slurry outlet of the slurry pump is communicated with the calcium hydroxide injection main pipe.

8. The device for mining solid waste slope management and carbon dioxide synergistic storage as claimed in claim 1, characterized in that: The carbon dioxide injection main pipe is provided with a gas one-way valve.

9. The device for mining solid waste slope management and carbon dioxide coordinated storage as claimed in claim 8, characterized in that: The gas one-way valve is close to the gas outlet of the carbon dioxide gas storage tank.

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