Mine filling mining roof contact and CO2 storage method

Abstract

The invention discloses a mine filling mining roof contact and CO2 storage method, which is characterized in that a roof contact bag is used as a top end part of a filling body to be in contact with a top plate, CO2 gas is filled in the inflatable roof contact bag, a pressure sensor is arranged in the bag, and hanging openings are formed in the periphery of the bag. The method comprises the following specific implementation steps that a roof-contacted bag is fixed to the position of a top plate of a filling operation area through suspension openings in the periphery of the bag or the roof-contacted bag is arranged above filling slurry, and the roof-contacted bag can float on the top of the filling slurry; after the filling slurry reaches a designated position, CO2 gas is injected into the roof-contacted bag, so that the filling body and the roof are completely connected through the roof-contacted bag, complete roof contact of the filling body is achieved while CO2 gas is stored, and if the situation that the filling body is seriously shrunk occurs in the filling body maintenance process, the filling body can be maintained. And the roof contact efficiency can be guaranteed by inflating the roof contact bag again. Meanwhile, in the layered filling process, a roof-contacted bag can be additionally arranged between the filling bodies, and the purpose of sealing and storing CO2 gas is achieved.

Description

Technical Field

[0001] The present invention relates to the field of mine mining technology, and in particular to a method for mine filling mining, roof connection and CO2 storage. Background Art

[0002] The backfill mining method can not only reduce the accumulation of solid waste generated during mining activities, but also prevent surface subsidence caused by deformation of the goaf and improve the recovery rate of ore. It is an important means to accelerate the promotion of intensive mining, comprehensive mining, green mining and safe mining.

[0003] However, due to the volumetric shrinkage of the filling slurry during curing, the fill loses sufficient contact with the roof of the filling area, failing to provide effective support. Expansive materials, due to their low long-term strength, are not suitable for use as roof support materials in mine backfill mining. Therefore, improving the roof support rate during backfill mining and ensuring the fill fully functions as a supportive material remains a major challenge in the development of backfill mining.

[0004] In summary, the present invention designs a method for mine filling mining and CO2 storage. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a method for mine filling mining and CO2 storage, which can greatly improve the mine filling mining rate while storing CO2 and other gases underground, thereby promoting the realization of carbon neutrality goals.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for mine filling, mining, roof connection and CO2 storage, comprising the following steps:

[0007] 1. Install the top bag: Fix the top bag on the top plate of the filling operation area through the hanging port, or place it above the feeding port of the filling operation area so that it is suspended above the filling slurry;

[0008] 2. Filling slurry

[0009] When the filling slurry reaches the designed height or the top bag contacts the top plate, the filling operation is stopped.

[0010] 3. Inflation

[0011] 3.1 Inject CO2 gas into the top bag to ensure that it is in full contact with the top plate;

[0012] 3.2 The air pressure in the bag is controlled at 200-300kPa through the pressure sensor;

[0013] 4. Maintenance and adjustment

[0014] During the curing process of the filling slurry, if the filling body shrinks severely, the joint bag can be re-inflated to ensure the joint efficiency;

[0015] Preferably, a large amount of CO2 gas is sealed by a layered filling method: a top-connecting bag is laid on top of each layer of filling slurry, and after the bag is filled with CO2 gas, the filling material is continued to be laid on the upper part of the bag, and this cycle is repeated until the top-connecting bag is finally connected to the filling operation top plate.

[0016] Preferably, the pressure sensor in step 3 monitors the top plate pressure. When the pressure sensor indicates that the pressure is greater than the compressive strength of the filling body, an alarm system connected to the pressure sensor issues an early warning.

[0017] The top-connected bladder bag comprises a bladder body, the front portion of which is provided with an inflation port, the interior of the bladder body is provided with a pressure sensor, and the exterior of the bladder body is provided with hanging ports around the periphery.

[0018] Preferably, the bag body is made of composite material, including an outer contact layer with the top plate and the filling body and an inner inflatable liner. The contact layer is made of 1-2 cm thick waste rubber, and the inflatable liner is made of tough fiber or rubber material.

[0019] Preferably, the shape of the pouch body is rectangular, or is preferably designed according to the filling operation area.

[0020] Preferably, the gas filled in the bag body is CO2.

[0021] Preferably, the gas pressure inside the pouch body is 200-300 kPa.

[0022] Preferably, the height of the pouch body is the height of the filling operation area minus the height of the filling body.

[0023] The present invention has the following beneficial effects:

[0024] 1. Improve the top connection rate: through the deformable characteristics of the top connection bag and the pressure adjustment of the internal CO2 gas, ensure that the filling body and the top plate fit tightly.

[0025] 2. CO2 storage: The top-joining bag is not only a filling and top-joining tool, but also a container for CO2 storage, which helps to achieve the carbon neutrality goal.

[0026] 3. Strong adaptability: The shape and size of the top bag can be adjusted according to the specific conditions of the filling operation area, and is suitable for various complex filling conditions.

[0027] 4. Monitoring function: The pressure sensor can monitor the air pressure in the bag in real time and serve as a monitoring device for the top plate pressure after the filling operation is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the top-connected bag of the present invention;

[0030] Figure 2 A top view of the top-jointed bladder bag of the present invention;

[0031] Figure 3 This is a schematic diagram of the material of the top-jointed bag of the present invention;

[0032] Figure 4 Schematic diagram of the top-joining operation of the top-joining bag of the present invention;

[0033] Figure 5 This is a schematic diagram of the alternating operation of the filling body and the top bag during the layered filling process of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] Reference Figure 1 This specific embodiment adopts the following technical solution: A method for mine filling mining and CO2 storage, comprising the following steps:

[0036] 1. Install the top bag: Fix the top bag on the top plate of the filling operation area through the hanging port, or place it above the feeding port of the filling operation area so that it is suspended above the filling slurry.

[0037] 2. Filling slurry

[0038] When the filling slurry reaches the designed height or the top bag contacts the top plate, the filling operation is stopped.

[0039] 3. Inflation

[0040] 3.1 Inject CO2 gas into the top bag to ensure that it is in full contact with the top plate;

[0041] 3.2 The air pressure in the bag is controlled within a certain range (recommended range is 200-300kPa) through the pressure sensor. The specific value can be determined according to the actual project conditions.

[0042] 4. Maintenance and adjustment

[0043] During the curing process of the filling slurry, if the filling body A shrinks severely, the joint bag can be re-inflated to ensure the joint efficiency.

[0044] It is worth noting that a large amount of CO2 gas is sealed by a layered filling method: a top-connecting bag is laid on top of each layer of filling slurry. After the bag is filled with CO2 gas, the filling material is continued to be laid on the upper part of the bag. This cycle continues until the top-connecting bag is finally connected to the filling operation top plate.

[0045] It is worth noting that the pressure sensor in step 3 monitors the top plate pressure. When the pressure sensor shows that the pressure is greater than the compressive strength of the filling body A, an alarm system connected to the pressure sensor can be used for early warning.

[0046] It is worth noting that the top-connected bladder includes a bladder body 1 , an inflation port 2 is provided at the front of the bladder body 1 , a pressure sensor 3 is provided inside the bladder body 1 , and hanging ports 4 are provided around the outside of the bladder body 1 .

[0047] It is worth noting that the bag body 1 is made of composite materials, including an outer contact layer 11 with the top plate and the filling body A and an inner inflatable liner 12. The contact layer is made of 1-2 cm thick waste rubber, such as waste tires, and the inflatable liner 12 is made of tough fiber or rubber material.

[0048] It is worth noting that the shape of the pouch body 1 is rectangular, or is preferably designed according to the filling operation area.

[0049] It is worth noting that the gas filled in the bag body 1 is CO2.

[0050] It is worth noting that the gas pressure inside the pouch body 1 is 200-300 kPa.

[0051] In addition, the height of the pouch body 1 is the height of the filling operation area minus the height of the filling body.

[0052] In this embodiment, the top bag is connected as follows Figure 1 and Figure 2 As shown, the top-jointing bag is preferably rectangular, and its specific shape and size can be determined according to the filling operation area. The top-jointing bag is fixed on the top plate of the filling operation area through the hanging holes 4 on all sides, or the top-jointing bag is placed above the feeding port of the filling operation area, and is suspended above the filling slurry. When the filling slurry in the filling operation area (the ore body B is outside the filling operation area) reaches the designed height or the top-jointing bag contacts the top plate of the filling operation area, the filling operation is stopped, CO2 is used as the filling gas of the top-jointing bag, and the bag is inflated to make it fully contact with the top plate. Figure 4As shown, the air pressure in the bag is controlled at 200-300kPa through the pressure sensor of the bag, which can be determined according to the actual situation of the project. The data measured by the pressure sensor 3 is transmitted to the data monitoring system through the data transmission line 5. During the curing and shrinkage process of the filling body, the top bag can be aerated at any time according to the changes of the bag pressure sensor to keep the bag and the top plate tightly fitted and maintain the air pressure inside the bag stable. At the same time, the pressure sensor can also be used as a top plate pressure monitoring device after the filling operation is completed. The material of the bag is preferably but not limited to a two-layer composite material such as Figure 3 As shown, the outer wall of the bag in contact with the top plate and the filling body is made of wear-resistant rubber, preferably waste tires, and the inner wall is preferably made of tough fiber or rubber. If there is a need to seal a large amount of CO2 gas, the filling operation can be carried out in layers in the filling operation area. Preferably, after filling the bottom of the filling area, a layer of top-connecting bag is laid on the filling body. After the bag is filled with CO2 gas, the filling material is continued to be laid on the upper part of the bag, and the cycle is repeated until the top-connecting bag is finally connected to the filling operation top plate. Figure 5 shown.

[0053] This specific implementation method has broad application prospects in the field of green mining. By improving the roof connection rate of backfill mining and achieving underground storage of CO2 gas, it can not only reduce the impact of mining activities on the environment, but also help achieve carbon neutrality goals and promote the development of mining in a more environmentally friendly and sustainable direction.

[0054] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for mine filling, mining and CO2 storage, characterized in that: The following steps are involved: (1) Install the top bag: fix the top bag on the top plate of the filling operation area through the hanging port, or place it above the feeding port of the filling operation area so that it is suspended above the filling slurry; (2) Filling slurry When the filling slurry reaches the designed height or the top bag contacts the top plate, the filling operation is stopped; (3) Inflation (3.1) Inject CO2 gas into the top bag to ensure that it is in full contact with the top plate; (3.2) The air pressure in the bag is controlled at 200-300 kPa through a pressure sensor; (4) Maintenance and adjustment During the curing process of the filling slurry, if the filling body shrinks severely, the joint bag can be re-inflated to ensure the efficiency of the joint.

2. The method of mine filling, mining, roof connection and CO2 storage according to claim 1, characterized in that: The step (3) seals a large amount of CO2 gas by adopting a layered filling method: a layer of top-connecting bag is laid on top of each layer of filling slurry, and after the bag is filled with CO2 gas, the filling material is continued to be laid on the upper part of the bag, and the cycle is repeated until the top-connecting bag is finally connected to the filling operation top plate.

3. The method of mine filling, mining, roof connection and CO2 storage according to claim 1, characterized in that: The pressure sensor in step (3) monitors the top plate pressure. When the pressure sensor indicates that the pressure is greater than the compressive strength of the filling body, an alarm system connected to the pressure sensor issues an early warning.

4. The method of mine filling mining and CO2 storage according to claim 1, characterized in that: The top-connected bladder comprises a bladder body (1), the front of the bladder body (1) is provided with an inflation port (2), the interior of the bladder body (1) is provided with a pressure sensor (3), and the exterior of the bladder body (1) is provided with hanging ports (4) around it.

5. The method of mine filling mining and CO2 storage according to claim 4, characterized in that: The bag body (1) is made of composite material, including an outer contact layer (11) with a top plate and a filling body and an inner inflatable liner (12). The contact layer is made of 1-2 cm thick waste rubber, and the inflatable liner (12) is made of tough fiber or rubber material.

6. The method for mine filling, mining, roof connection and CO2 storage according to claim 4, characterized in that: The shape of the pouch body (1) matches the filling operation area.

7. The method of mine filling, mining, roof connection and CO2 storage according to claim 4, characterized in that: The gas filled in the bag body (1) is CO2.

8. The method of mine filling, mining, roof connection and CO2 storage according to claim 4, characterized in that: The gas pressure inside the pouch body (1) is 200-300 kPa.

9. The method of mine filling, mining, roof connection and CO2 storage according to claim 4, characterized in that: The height of the pouch body (1) is the height of the filling operation area minus the height of the filling body.

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