Thin vein foam concrete layered filling mining method

Abstract

The invention discloses a thin vein foam concrete layered filling mining method, which relates to the technical field of mining, and comprises the following steps: performing shallow hole rock drilling and ore breaking in an ore block in a layered stoping sequence from bottom to top; 2-3 adjacent stopes in the middle section are alternately subjected to mining and filling operation, and in the stopes, an electric carry-scraper is adopted to transport ore to a steel draw shaft, and the ore is fed to a mine car through a vibration ore drawing machine; and a small movable intelligent foam concrete filling system is arranged in the mining middle section transverse crossing channel, and after foam concrete filling slurry is prepared according to preset matching parameters, the foam concrete filling slurry is conveyed to a stope for filling through a hose pump. According to the invention, efficient, safe and environment-friendly mining operation is realized.

Description

Technical Field

[0001] The invention relates to the technical field of mining, in particular to a thin-vein foam concrete layered filling mining method. Background Art

[0002] Traditional mines generally adopt the full-scale method of leaving ore for thin ore bodies, the shallow hole method of leaving ore for mining, and the electric rake method for mining. Its characteristics are low mining efficiency, poor safety, and high mining loss rate and dilution rate. The latest design specifications require that new construction, renovation and expansion of metal and non-metal underground mines should adopt the filling mining method, and those that cannot be adopted should be demonstrated for special projects. Generally, the filling mining method requires the construction of a filling station on the surface and the laying of filling pipelines to the underground filling area. The size of the filling line determines the slurry transportation method. Its disadvantages are: the construction cost of the filling system is high, the one-time investment is large, and it is difficult to build a new filling station for mines with poor economic benefits; some mine tailings contain harmful substances such as cyanide and arsenic, which cannot be used for underground filling. Due to the limited source of filling aggregates, the application of mine filling mining is also limited; some mines use waste rock filling mining, which has many problems such as high labor intensity for secondary transportation of waste rock in the mine, poor working environment, and low filling efficiency. Therefore, different mines are affected by various unfavorable factors to varying degrees, which seriously restricts the application of backfill mining method. Summary of the invention

[0003] The invention provides a thin-vein foam concrete layered filling mining method to solve the technical problems of high filling mining cost, high strength and low efficiency in the related art.

[0004] According to the present invention, a thin-vein foamed concrete layered filling mining method is provided, comprising: In the vertical direction, the mining body to be mined is divided into N mining sections, and no top or bottom pillars are set between two adjacent sections; in the horizontal direction, the ore blocks are arranged along the strike of the mining body to be mined, wherein each ore block consists of a mine room and intermediate pillars, an ore steel chute is arranged in the mine room, and a pedestrian ventilation skylight and a connecting road are arranged in the intermediate pillars; The ore block is mined in layers from bottom to top, with shallow holes drilled to remove ore; In the middle section, 2 to 3 adjacent stopes are used for mining and filling operations alternately. Electric scrapers are used in the stopes to transport ore to the steel chute, and then the ore is fed to the mine car through a vibrating ore-feeding machine. A small movable intelligent foam concrete filling system is arranged in the vein tunnel in the middle section of mining. After the foam concrete filling slurry is prepared according to the preset mix parameters, the foam concrete filling slurry is transported to the mining site for filling through a hose pump.

[0005] Optionally, for inclined and gently inclined ore bodies, the mining middle section height is 40m; for steeply inclined ore bodies, the mining middle section height is 60m.

[0006] Optionally, the mine room is 40-60m long, its width is the thickness of the ore body to be mined, and its height is the height of the middle section of mining; the intermediate pillar is 6m long, its width is the thickness of the ore body to be mined, and its height is the height of the middle section of mining.

[0007] Optionally, the ore steel chute has a diameter of 1.2 m, is arranged in a foam concrete filling body, and is connected in sections with a section height of 2 m.

[0008] Optionally, the pedestrian ventilation shaft is located at the center of the lower wall column of the mining body to be mined, with a size of 2m×2m.

[0009] Optionally, the layer height for layered mining within the ore block is 2m, and the top control height is 3m.

[0010] Optionally, the electric shovel loader can mine in different adjacent mines through the inner connecting track of the mine, and the 2 to 3 adjacent mines in the middle section perform mining and filling operations alternately, including: one mine performs rock drilling and ore dropping operations, one mine performs mining operations, and one mine performs foam concrete filling operations, so as to realize alternating mining and filling.

[0011] Optionally, the preparing of the foam concrete filling slurry according to the preset mixing ratio parameters includes: preparing the filling slurry according to the mixing ratio parameters of cement, water and foaming agent of 1:0.5:0.0005-0.001, and controlling the cement unit consumption to be 0.5-0.7 t / m 3 within the range.

[0012] Optionally, the foam concrete filling system consists of a cement screw feeder, a foaming machine, a double-barrel vertical mixer and a hose pump, which can flexibly pass through the tunnel, thereby realizing slurry filling in the mining area. The filling capacity of the foam concrete filling system is 10~20m 3 / h, the 3d compressive strength of the filling body is greater than 3Mpa.

[0013] Optionally, before the foam concrete filling slurry is transported to the stope for filling by a hose pump, the method further comprises constructing a 0.8m wide and 2.2m high mortar-stone filling retaining wall in the connecting roads on both sides of the stope.

[0014] The beneficial effects of the present invention are as follows: by drilling shallow holes in the mining area to remove ore, using electric shovel loaders to remove ore, and arranging a small movable intelligent foam concrete filling system outside the mining area, labor costs are saved; shallow hole drilling is adopted in the ore block from bottom to top in a layered recovery sequence, the mining and cutting workload is small, the ore block production capacity is large, and the safety is high; the mining and filling operations are carried out alternately in the mining area, which saves time and ensures continuous and efficient operations; the small movable intelligent foam concrete filling system arranged in the link is used for slurry filling, which has a small investment, is flexible and convenient, and has a quick effect; cement, foaming agent, and water are used as filling materials, and slurry filling is fast, thereby improving the efficiency of filling and mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the process of a thin-vein foam concrete layered filling mining method according to an embodiment of the present invention; Figure 2 Schematic diagram of a small-sized mobile intelligent foam concrete filling system in an embodiment of the present invention; Figure 3 A schematic diagram of a stope space in an embodiment of the present invention; Figure 4 for Figure 3 Cross-sectional view along plane II-II; Figure 5 for Figure 3 Cross-sectional view along plane III-III. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0017] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0018] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, product, or apparatus comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0019] Embodiment 1 of the present invention Reference Figure 1 , Figure 1 The present invention is a flowchart of a thin-vein foam concrete layered filling mining method according to an embodiment of the present invention, which includes the following steps: S1, in the vertical direction, the body to be mined is divided into N mining sections, and no top or bottom pillars are set between two adjacent sections; in the horizontal direction, ore blocks are arranged along the strike of the body to be mined, wherein each ore block consists of a mine room and intermediate pillars, an ore steel chute is arranged in the mine room, and a pedestrian ventilation skylight and a connecting road are arranged in the intermediate pillars; No top and bottom pillars are set between mining sections, which can reduce ore loss and improve mining efficiency.

[0020] The mine room is used to store ore, and a steel chute is arranged inside to facilitate the transportation of ore.

[0021] The pillars serve as supporting structures, with pedestrian ventilation shafts and connecting roads arranged inside to ensure the safety and ventilation of mining operations.

[0022] Further, in one embodiment, when S1 vertically divides the mining middle section, for inclined and gently inclined ore bodies, the mining middle section height can be set to 40m; for steeply inclined ore bodies, the mining middle section height is set to 60m.

[0023] Among them, gently inclined ore bodies refer to ore bodies with an inclination angle (the angle between the inclined surface of the ore body and the horizontal plane) between 5° and 30°; inclined ore bodies refer to ore bodies with an inclination angle between 30° and 55°; steeply inclined ore bodies refer to ore bodies with an inclination angle greater than 55°. Setting the middle section height of inclined and gently inclined ore bodies to 40m helps reduce pressure concentration during mining and improve the safety of mining operations. At the same time, the height of 40m is also convenient for the operation of mining equipment and the transportation of ore. The middle section height of steeply inclined ore bodies is set to 60m because a higher middle section height can reduce the inclination effect during mining and improve mining efficiency.

[0024] Further, in one embodiment, when S1 arranges the ore blocks horizontally, the length of the mine room is set to 40~60m, the width is the thickness of the mined body, and the height is the height of the middle section of mining; the length of the intermediate pillar is set to 6m, the width is the thickness of the mined body, and the height is the height of the middle section.

[0025] Furthermore, the diameter of the ore steel chute in the mine room of S1 can be set to 1.2m and arranged in the foam concrete filling body. This design can ensure that the ore can be smoothly transported to the bottom through the chute, while reducing the loss of ore during transportation. The ore steel chute adopts a segmented connection method with a segment height of 2m, which helps to control the transportation speed of the ore and ensure the safety of transportation.

[0026] Furthermore, the pedestrian ventilation shaft in S1 is set in the central position of the inter-pillar of the lower plate of the ore body, with a specification of 2m×2m. The pedestrian ventilation shaft not only provides a safe passage for miners, but also ensures the ventilation effect during the mining process. Through the reasonable arrangement of the pedestrian ventilation shaft, the dust concentration and harmful gas concentration in mining operations can be effectively reduced, and the environmental quality of mining operations can be improved.

[0027] It can be understood that in actual applications, the selection and design of mining parameters can be appropriately adjusted and optimized according to the specific ore body conditions and mining requirements to ensure the smooth progress of mining operations and the effective recovery of ore.

[0028] S2, the ore block is mined in layers from bottom to top, with shallow holes drilled to remove ore; In this embodiment, a layered mining sequence is adopted from bottom to top, starting the mining operation from the lowest middle section of the ore block and moving upward layer by layer. As the mining progresses, the rock pressure above the goaf will gradually be released and dispersed, thereby avoiding unnecessary damage to the ore above and helping to maintain the safety and stability of the mining process.

[0029] The use of shallow hole drilling technology to drop ore can ensure the crushing effect of ore and mining efficiency. Among them, shallow hole drilling and dropping ore can be achieved by a rock drill, which is a common mining equipment used to drill blastholes in ore. By drilling blastholes and loading explosives for blasting, ore crushing and dropping can be achieved.

[0030] Furthermore, in one embodiment, the layered height of the layered mining setting is 2m, and the top control height is 3m.

[0031] Layered mining helps to reduce the concentration of pressure during the mining process and improve the safety and stability of mining operations. Layer height refers to the vertical distance between two adjacent layers of mining faces, and top control height refers to the vertical distance between the mining face and the roof. Layer height and top control height are determined according to the thickness of the ore body and mining conditions, and the size of the layer height directly affects the efficiency and safety of mining operations. During the mining process, the ore will be mined layer by layer, and the height of each layer is 2m, which is convenient for the operation of mining equipment and the transportation of ore. The top control height is 3m, which means that during the mining process, the thickness of the rock layer at the top of the stope needs to be kept at about 3m to ensure the stability of the top of the stope. In actual mining operations, the layer height and top control height can be set based on a variety of factors, including the physical properties of the ore body, the choice of mining methods, the performance of mining equipment, and the safety requirements of mining operations. By setting reasonable layer height and top control height, the smooth progress of mining operations can be ensured, while maximizing the recovery rate of ore and mining efficiency.

[0032] S3, in the middle section, 2~3 adjacent stopes are used for mining and filling operations alternately. Electric scrapers are used in the stopes to transport the ore to the steel chute, and then the ore is fed to the mine car by a vibrating ore-feeding machine; Two or three adjacent stopes in the middle section will carry out mining and filling operations alternately. When one stope is mining, the other or two stopes are filling. This alternating method helps to maintain the continuity and efficiency of the mining process, while reducing the pressure on a single stope.

[0033] Use electric shovel loaders, such as a small electric shovel loaders, to transport the ore to the steel chute, and then use a vibrating ore feeder to feed the ore to the mine car for transportation, which improves the transportation efficiency of the ore and reduces labor costs.

[0034] Furthermore, in one embodiment, the electric shovel loader can mine in different adjacent mines through the internal connecting road of the mine, and 2 to 3 adjacent mines perform mining and filling operations alternately, including one mine performing rock drilling and ore dropping operations, one mine performing mining operations, and one mine performing foam concrete filling operations, and mining and filling are performed alternately.

[0035] In order to ensure the continuity and efficiency of mining operations, the present invention performs rock drilling and ore removal, ore removal from the mining area and foam filling operations alternately in different mining areas, so as to make full use of time and resources and improve efficiency.

[0036] S4, a small movable intelligent foam concrete filling system is arranged in the vein connection channel in the middle section of mining. After the foam concrete filling slurry is prepared according to the preset ratio parameters, the foam concrete filling slurry is transported to the mining site for filling through a hose pump.

[0037] A vein drill is a horizontal tunnel that is excavated from the vein or stone gate to the ore body and has no direct exit from the ground. A connecting tunnel usually refers to a tunnel excavated during the mining process to connect different tunnels or working faces and to achieve functions such as ventilation, transportation, and drainage. On the basis of vein drills, a complete tunnel network can be formed by excavating connecting tunnels, which facilitates mining operations.

[0038] Furthermore, in one embodiment, preparing the foam concrete filling slurry according to preset mix parameters includes: preparing the filling slurry according to the mix parameters of cement, water, and foaming agent according to 1:0.5:0.0005~0.001, and controlling the cement unit consumption within the range of 0.5~0.7t / m3, that is, the amount of cement required per cubic meter of foam concrete is between 0.5 and 0.7 tons.

[0039] As the ore is mined, goaf areas are formed. In order to maintain the stability of underground mines, filling materials (such as cement slurry, mortar, etc.) are needed to fill the goaf areas. In the embodiment of the present invention, foamed concrete is used for filling. Foamed concrete has a low density but high strength, which can meet the material strength requirements for goaf filling. Its lightweight characteristics help reduce additional stress on the foundation and reduce foundation settlement, thereby maintaining the stability of the mine. The construction speed is fast, which can shorten the mining cycle, improve mining efficiency, and have low cost.

[0040] Further, refer to Figure 2 , Figure 2 Schematic diagram of a small mobile intelligent foam concrete filling system in an embodiment of the present invention. Figure 2 As shown, the foam concrete filling system consists of a cement screw feeder, a foaming machine, a double-barrel vertical mixer and a hose pump (not shown in the figure), which can flexibly pass through the joint channel to achieve slurry filling in the mining area. The filling capacity of the foam concrete filling system is 10~20m3 / h, and the 3d compressive strength of the filling body is greater than 3Mpa.

[0041] Among them, the cement screw feeder is used to accurately feed cement into the mixing system according to the preset ratio; the foaming machine is used to mix the foaming agent with the water in the plastic bucket through a specific foaming process to produce a large number of fine bubbles. The quality of the foam produced by the foaming machine affects the density, strength and thermal insulation performance of the foamed concrete; the double-barrel vertical mixer is used to mix cement, water (possibly other additives) and the foam produced by the foaming machine to form a uniform foamed concrete slurry. The double-barrel design can achieve continuous mixing and improve production efficiency; the hose pump is responsible for transporting the stirred foamed concrete slurry to the filling site. The hose pump has the advantages of long conveying distance, strong adaptability and simple maintenance. It is particularly suitable for use in complex underground environments. The prepared foamed concrete filling slurry is transported to the mining site through the hose pump, which not only improves the filling efficiency, but also ensures the uniformity and stability of the filling body. The use of movable foam filling equipment can flexibly pass through narrow tunnels underground, making slurry filling more convenient.

[0042] Furthermore, the foamed concrete filling slurry is transported to the stope by a hose pump before filling. The method also includes constructing a 0.8m wide and 2.2m high mortar-laid stone filling retaining wall in the connecting roads on both sides of the stope.

[0043] As the main solid structural component in the filling body, the mortar-masonry retaining wall can effectively support the internal structure of the filling body, control the filling range, prevent the filling body from collapsing or deforming, and thus improve the overall stability.

[0044] The embodiment of the present invention realizes efficient, safe and environmentally friendly mining operations through reasonable ore body division, layered mining sequence, alternating mining and filling operations, and foam concrete filling. This method is particularly suitable for mining thin ore veins and can maximize the recovery rate of ore and mining efficiency.

[0045] Embodiment 2 of the present invention The technical solution of the present invention is further described in detail below in conjunction with a specific embodiment and the accompanying drawings.

[0046] In the embodiment of the present invention, a thin ore body to be mined has a dip angle of 45°, an average thickness of 4m, a strike length of 600m, and an occurrence elevation of 300m to 100m. A thin ore body foam concrete layered filling mining method according to the present invention is used for filling mining, including: Step 1: Divide the ore body into 6 sections along the vertical direction, namely 300m (as the return air section), 260m, 220m, 180m, 140m, and 100m. No top or bottom pillars are set between two adjacent sections. Horizontally, ore blocks are arranged along the direction of the ore body. The ore blocks are composed of mine rooms and pillars. The specifications of the mine room are: length × width × height = 40m × 4m × 40m, and the specifications of the pillars are: length × width × height = 6m × 4m × 40m. A 1.2m diameter ore steel chute is arranged on one side of the mine room, and a 2m × 2m pedestrian ventilation shaft and communication road are arranged in the pillars to ensure ventilation and personnel passage during the mining process. Figure 3 , Figure 4 , Figure 5 ,in, Figure 3 is a schematic diagram of a stope space in an embodiment of the present invention, Figure 4 for Figure 3 Cross-sectional view along plane II-II; Figure 5 for Figure 3 Cross-sectional view along plane III-III.

[0047] Step 2: In the ore block, adopt the order of layered mining from bottom to top, use the YT-28 rock drill to drill the rock and drop the ore, the blasthole diameter is 40mm, and the hole depth is 2m. The layer height in the stope is 2m, and the top control height is 3m. The ventilation route of the stope: fresh air flow → main transport tunnel → through vein connecting tunnel → pedestrian ventilation skylight on the left side of the stope → stope working face → pedestrian ventilation skylight on the right side of the stope → upper middle section return air tunnel.

[0048] Step 3: The three adjacent mining areas in the middle section carry out mining and filling operations alternately. The height difference of the working surfaces of the three adjacent mining areas is kept within 2m. The WDJ-1 electric shovel loader is used in the mining area to transport the ore to the steel chute, and the ore is fed into the mine car in the main transport tunnel of the middle section through the vibrating ore-discharging machine. The electric shovel loader can reach different mining areas for ore unloading operations via the ramp in the mining area.

[0049] Step 4: Construct a 0.8m wide and 2.2m high mortar-stone filling retaining wall in the connecting roads on both sides of the mining area to be filled. Arrange a small movable intelligent foam concrete filling system in the vein connecting road in the middle section of the mining area. Raw materials such as cement, water, and foaming agent are transported to the vicinity of the filling mining area by flatbed mine cars, and foam concrete filling slurry is prepared according to the predetermined mix parameters. The prepared slurry is transported to the mining area by a hose pump for filling operations. The height of the layered filling is 2m, which is consistent with the layered height of the mining area. The filling body in the mining area needs to be cured for 3 days to ensure that its strength meets the requirements. After curing, the uniaxial compressive strength of the filling body should be greater than 3Mpa to meet the safety and stability requirements of mining operations.

[0050] After that, the next layer mining work will start. The whole mining process will be carried out according to the following cycle: rock drilling and ore dropping → ventilation → electric shovel mining → filling in the mining area → curing of the filling body (strength>3Mpa) → rock drilling and ore dropping... cycle work until the mining of the mine room is completed. In this cycle, rock drilling and ore dropping is the first step of mining operation. The ore is broken and ore is dropped by drilling blastholes and loading explosives for blasting. Then ventilation operation is carried out to ensure air circulation in the mining area and the discharge of harmful gases. Then the ore is transported to the steel chute by an electric scraper and fed into the mine car of the middle main transport roadway by a vibrating ore discharger. After the mining operation is completed, the mining area is immediately filled with foam concrete to fill the goaf. After the filling is completed, the filling body is cured to ensure that its strength meets the requirements. After the curing is completed, the next layer of rock drilling and ore dropping operation is started, and the cycle is repeated until the mining of the entire mine room is completed.

[0051] In summary, a thin vein foam concrete layered filling mining method according to an embodiment of the present invention realizes efficient, safe and environmentally friendly mining of thin veins by rationally alternating mining and filling operations, constructing filling retaining walls and foam concrete filling, and performing cyclic work.

[0052] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A thin vein foam concrete layered filling mining method, characterized in that: include: In the vertical direction, the mining body to be mined is divided into N mining sections, and no top or bottom pillars are set between two adjacent sections; In the horizontal direction, ore blocks are arranged along the strike of the ore body to be mined, wherein each ore block consists of a mine room and pillars, an ore steel chute is arranged in the mine room, and a pedestrian ventilation shaft and a connecting road are arranged in the pillars; The ore block is mined in layers from bottom to top, with shallow holes drilled to remove ore; In the middle section, 2 to 3 adjacent stopes are used for mining and filling operations alternately. Electric scrapers are used in the stopes to transport ore to the steel chute, and then the ore is fed to the mine car through a vibrating ore-feeding machine. A small movable intelligent foam concrete filling system is arranged in the vein tunnel in the middle section of mining. After the foam concrete filling slurry is prepared according to the preset mix parameters, the foam concrete filling slurry is transported to the mining site for filling through a hose pump.

2. The thin-vein foamed concrete layered filling mining method according to claim 1 is characterized in that: For inclined and gently inclined ore bodies, the middle mining height is 40m; for steeply inclined ore bodies, the middle mining height is 60m.

3. The thin-vein foamed concrete layered filling mining method according to claim 1 is characterized in that: The mine room is 40~60m long, the width is the thickness of the mined body to be mined, and the height is the height of the middle section of mining; the intermediate pillar is 6m long, the width is the thickness of the mined body to be mined, and the height is the height of the middle section of mining.

4. The thin-vein foamed concrete layered filling mining method according to claim 1 is characterized in that: The ore steel chute has a diameter of 1.2m, is arranged in a foam concrete filling body, and is connected in sections with a section height of 2m.

5. The thin-vein foamed concrete layered filling mining method according to claim 1 is characterized in that: The pedestrian ventilation shaft is located at the center of the lower wall column of the mining body to be mined, and has a size of 2m×2m.

6. The thin-vein foamed concrete layered filling mining method according to claim 1, characterized in that: The layer height for layered mining within the ore block is 2m, and the top control height is 3m.

7. The thin-vein foamed concrete layered filling mining method according to claim 1 is characterized in that: The electric shovel loader can mine in different adjacent mines through the inner connecting track of the mine. The 2 to 3 adjacent mines in the middle section perform mining and filling operations alternately, including: one mine performs rock drilling and ore dropping operations, one mine performs mining operations, and one mine performs foam concrete filling operations, so as to realize alternating mining and filling.

8. The thin-vein foamed concrete layered filling mining method according to claim 1, characterized in that: The method of preparing the foamed concrete filling slurry according to the preset mixing ratio parameters comprises: Prepare filling slurry with cement, water and foaming agent in a ratio of 1:0.5:0.0005~0.001, and control the cement consumption at 0.5~0.7t / m 3 within the range.

9. The thin-vein foamed concrete layered filling mining method according to claim 1, characterized in that: The foam concrete filling system consists of a cement screw feeder, a foaming machine, a double-barrel vertical mixer and a hose pump, which can flexibly pass through the joint channel to achieve slurry filling in the mining area. The filling capacity of the foam concrete filling system is 10~20m 3 / h, the 3d compressive strength of the filling body is greater than 3Mpa.

10. The thin-vein foamed concrete layered filling mining method according to claim 1, characterized in that: Before the foam concrete filling slurry is transported to the stope for filling by a hose pump, the method also includes constructing a 0.8m wide and 2.2m high mortar-laid stone filling retaining wall in the connecting roads on both sides of the stope.

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