A solid potash mine body cutting device and mining method for full-thickness mining

Abstract

The application discloses a solid potash mine full-thickness mining body cutting device and a mining method. The device is composed of a main stress steel pipe, a mining body cutting machine, a mining body crusher, an upward driving machine and a flexible ore conveying pipeline. The device is driven by electricity and is provided with three independent motors for controlling ore cutting, crushing and upward cutting operation respectively. The device can cut full-thickness mining body at one time. The lower part of the cutting drill bit is provided with the mining body crusher. The cut mining body can be directly crushed and conveyed to the stage belt conveying roadway through the flexible conveying pipe. The mining method can cut full-thickness mining body in the vertical direction at one time. The development system is simple, safe and efficient, and no ore pillar is reserved. The recovery rate is very high. The width of the mined-out area is small, and the safety is high.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and in particular to a cutting device and mining method for cutting a full-thickness solid potash ore body in one operation. Background Technology

[0002] Potash mines are evaporative salt mines, formed by the evaporation, concentration, and crystallization of brine from closed or semi-closed salt lakes (basins). The thickness of the ore deposits is generally 4m-300m, the dip angle of the ore body is generally 1-5°, and the average thickness is 20m-100m. Potash deposits are soft rock ore bodies, which are easily dissolved by fresh water. The surrounding rock of the roof has low mechanical strength and poor roof stability. The ore deposits are relatively shallow, and the ground is prone to deformation after mining. The mining process generally uses the room-and-pillar method, the open-pit backfilling method, and the water-soluble method for phosphate mining. For underground potash ore bodies, if the water-soluble method is not properly sealed or if old brine is reinjected into the underground solution cavities, it may overflow and discharge into the shallow pore aquifer along the fissures or "skylights", causing groundwater pollution. When using the room-and-pillar method, due to the poor bearing capacity of the ore and rock, a large volume of pillars needs to be reserved to support the goaf, resulting in resource waste. When using the open-pit backfilling method, due to the large exposed area of ​​the roof and the problem of mismatch in the backfilling process, the roof is prone to instability. For mining thick ore bodies, traditional room-and-pillar mining and subsequent backfilling mining employ layered mining methods, which are complex, have low recovery rates, and weak ore production capacity.

[0003] Patent CN 107237635 B discloses a method for mining extra-thick solid potash ore in a single operation. The method involves setting up room-type mining faces at the top and bottom of the solid potash ore layer, using a potash mining machine to extract ore from the rooms, and leaving pillars to support the roof. The rooms and pillars at the top and bottom of the ore layer correspond one-to-one. Then, a raise boring machine is installed in the top room, using a directional drill bit to drill from the bottom of the top room to the top of the bottom room. A reverse drill bit is installed in the bottom room to complete the ore extraction process. This mining method divides the ore body into rooms, reserving pillars to support the goaf, without filling the goaf. Because the pillars are over 100 meters high, the goaf has poor safety, low recovery rate, and is prone to surface subsidence later. Furthermore, the circular directional drill bit is not conducive to continuous and stable mining operations. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a cutting device and mining method for cutting thick solid potash ore bodies in a single operation. This solves the problems of low recovery rates, poor working conditions, and roof and floor instability in thick potash ore deposits.

[0005] The solution of the present invention is: A cutting device for cutting a solid potash ore body in one pass, comprising a main load-bearing steel pipe, an ore body cutting machine, an ore body crusher, an upward drive motor, and a flexible ore transport pipeline. The bottom of the main load-bearing steel pipe is provided with a bearing base, and the surface of the main load-bearing steel pipe is provided with corresponding concave threads. The main load-bearing steel pipe is fitted with a matching equipment operating platform. The ore cutting machine is driven and controlled by an electric motor, which transmits power to the cutting drill bit through a power sensor shaft. The ore cutting machine and the ore crusher are respectively set on the equipment operating platform. The cut ore is crushed by the ore crusher, and the ore crusher transports the ore powder through a flexible ore transport pipeline. The bottom of the equipment's operating platform is equipped with a lifting drive motor, whose convex thread engages with the concave thread of the main load-bearing steel pipe to bear force; the bottom of the lifting drive motor is equipped with a cutting device to prevent falls. The lifting drive motor is located below the equipment's operating platform, and during the potash ore cutting process, the mechanical operation propels the entire platform upwards for cutting.

[0006] As a preferred technical solution, the lifting drive includes a mechanical structure that matches the thread of the main load-bearing steel pipe, and the mechanical structure transmits power to the power motor via a steel belt.

[0007] As a preferred technical solution, the mechanical structure includes a fixed base, on which the power motor is mounted on a bearing plate. The inner side of the rotating ring of the fixed base matches the thread of the main load-bearing steel pipe, and the outer side of the rotating ring is connected to the rotating shaft of the power motor via a transmission steel belt.

[0008] The power motor and mechanical structure transmit power via a steel belt. A high-power motor is selected. When the motor is started, the entire drive component moves upward, providing upward pressure to the drill bit. Simultaneously, the lifting drive is equipped with a corresponding cutting device and anti-fall safety mechanism to prevent the entire equipment from moving downwards.

[0009] As a preferred technical solution, the ore cutting machine is connected to the ore cutting head via a stepless speed regulator, and the ore cutting drill bit is a square hole drill bit.

[0010] As a preferred technical solution, the ore body cutting machine is provided with the ore body crusher on one side, the ore body crusher is provided with an inclined ore trough above the inlet of the ore body crusher, and the bottom outlet of the ore crusher is connected to the conveyor belt at the bottom of the ore chamber through the flexible conveying pipe.

[0011] As a preferred technical solution, the main load-bearing steel pipe is a multi-section splicable steel pipe, with corresponding fixing buckle slots and buckles at two adjacent pipe joints. After the two sections of steel pipe are rotated and tightened, during installation, the fixing buckles are released by pressing the spring-loaded structure, and the two sections of steel pipe are fixed and locked; during disassembly, the fixing buckles are first returned to their original positions before rotational disassembly.

[0012] The present invention also discloses a method for cutting a ore body using a device for mining full-thickness solid potash ore in a single operation, comprising the following steps: 1) Panel layout for stopes: The mining method adopts panel layout, and the panel is divided into strip stops. The stops are divided into cut bodies of the same size. The stops are mined sequentially, and no pillars are reserved. 2) During the excavation of the preparation roadway, through-vein and along-vein roadways are arranged in the roof and floor of the ore body. The roadways in the roof and floor of the ore body are parallel, and a 2-5m isolation pillar is left between the two parallel roadways, mainly to maintain the stability of the roadway. The bottom of the roadway is hardened with concrete as a water-proof layer. The surrounding rock of the potash mine floor roadway is a salt rock, which is generally soluble. The bottom of the roadway is hardened with concrete as a water-proof layer to prevent the backfill from bleeding water and causing the backfill to lose its load-bearing function. 3) Drill holes in the potash ore body, drilling from the roof surrounding rock roadway to the floor surrounding rock roadway, with the drilling direction perpendicular to the cross-vein roadway, and the drilling penetrating the entire ore body, serving as the installation space for the main load-bearing steel pipe of the ore body cutting device for mining full-thickness solid potash ore in one go. 4) Equipment matching: First, the main load-bearing steel pipe is placed in the borehole, and then the corresponding supporting equipment is installed; the ore body cutting machine, ore body crusher, flexible ore transport pipeline and belt transport system configured in the footwall cross-vein roadway are installed on the main load-bearing steel pipe, and corresponding fixing structures are designed and installed at the top and bottom. 5) Start the ore body cutting machine to carry out the ore cutting operation. The ore body cutting machine cuts and cuts the ore body from bottom to top, cutting the strip cutting units one by one. Two adjacent cutting units can be cut at the same time, but there must be a gap in the cutting height. 6) Strip stope backfilling: After the strip stope ore body is cut, the strip stope is backfilled with tailings cemented in. After the backfill body bleeds water, the next strip stope mining operation is carried out.

[0013] The ore cutting machine is equipped with an ore cutting drill bit, which has cutting blades.

[0014] As a preferred technical solution, during the installation of the supporting equipment, the ore body is first cut longitudinally along the stope using a ore body cutting machine to create an installation space for the equipment. The excavation height is between 4-5m. Then, the main load-bearing steel pipe base is installed. The base is mainly used to support the main load-bearing steel pipe vertically. The base part needs to be excavated into the bottom plate of the ore body, and after laying crushed stone, the load-bearing base is installed. After the load-bearing base is installed, the first section of the main load-bearing steel pipe is installed. This section of the main load-bearing steel pipe is about 1.5m long. The hoisting drive is first installed on the first section of the main load-bearing steel pipe. The hoisting drive is assembled as a whole before being installed on the main load-bearing steel pipe. The hoisting drive is then installed on the main load-bearing steel pipe by hoisting.

[0015] After installing the lifting drive, the equipment operating platform is installed. The operating platform sits atop the lifting drive, and the two parts are connected by pins. The ore crusher and ore cutter on the operating platform are already assembled before operation and are also installed using a hoisting method. After installing the equipment transfer platform, the ore cutting drill bit is installed and connected to the ore cutting machine. After installing the cutting machine drill bit, the inclined ore lowering trough is installed, and finally, the flexible ore transport pipeline is installed. After the equipment installation is completed, commissioning is performed.

[0016] As a preferred technical solution, the tailings cementing backfill material in step 6) includes tailings salt, magnesium slurry and adhesive powder; the adhesive powder contains 97% magnesium oxide, the ratio of tailings salt to magnesium slurry is 1.1:1, and the ratio of adhesive powder to magnesium slurry liquid phase is 1:6 to 1:18.

[0017] The above-mentioned technical solution provides a cutting device and mining method for cutting full-thickness solid potash ore in a single operation. The device includes a main load-bearing steel pipe, an ore cutting machine, an ore crusher, an upward drive motor, and a flexible ore transport pipeline. The main load-bearing steel pipe has a supporting base at its bottom and corresponding concave threads on its surface. A matching equipment operating platform is fitted onto the main load-bearing steel pipe. The ore cutting machine is driven and controlled by a motor, which transmits power to the cutting drill bit via a power sensor shaft. The ore cutting machine and the ore crusher are respectively mounted on the equipment operating platform. The ore crusher transports ore powder through the flexible ore transport pipeline. An upward drive motor is located at the bottom of the equipment operating platform. A cutting device anti-fall safety device is installed at the bottom of the upward drive motor.

[0018] Advantages of this invention: This invention uses a strip-shaped arrangement of cutting units and ore bodies to achieve continuous cutting of the ore body in space. No pillars need to be reserved during the ore mining process, resulting in a high recovery rate and less development work.

[0019] This invention divides the entire ore body into different chambers according to strips, and divides them into different cutting units based on the potash ore cutting machine. It can extract the entire ore body vertically in one go, which is safe, automated and efficient.

[0020] The ore cutting equipment is arranged on a fixed steel pipe and guided to move upward by a self-driven method. Compared with traditional riser drilling rigs, it has less kinetic energy loss during drilling, and the entire ore cutting process can be continuously advanced.

[0021] The cutting unit of the cutting machine is square, which is conducive to the continuous cutting of the ore body and the arrangement of the overall ore body cutting unit, and can effectively avoid the generation of residual ore during the production process.

[0022] The cutting equipment of this invention is reasonably arranged, integrating the ore cutting machine and the ore crusher into one unit. The ore body is transported to the conveyor belt through a flexible pipeline, resulting in less dust generation during the production process and eliminating the need for secondary crushing of the ore.

[0023] After the strip stope is cut, cemented filling is carried out. Due to the small exposed area of ​​the roof, the roof has high stability during production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cross-sectional layout of the ore body cutting device for one-time mining of full-thickness solid potassium salt ore in this invention. Figure 2 This is a schematic diagram of the upward operation principle of a cutting device for mining a full-thickness solid potash ore body in one go. Figure 3 This is a schematic diagram of the connection structure between the stressed steel pipes in this invention; Figure 4 This is a cross-sectional view of the layout of the ore body development and preparation roadways in this invention; Figure 5 This is a diagram showing the arrangement of the disc area of ​​the present invention on a horizontal plane; Figure 6 This is a front view of the strip-shaped stope of the present invention; Figure 7 This is a side view of a single cutting unit of the present invention.

[0025] In the diagram, 1-Equipment operating platform; 2-Uplift drive motor; 3-Main load-bearing steel pipe; 4-Flexible ore transport pipe; 5-Anti-fall safety device for cutting device; 6-Ore body cutting machine; 7-Ore body crusher; 8-Ore cutting blade; 9-Inclined ore lowering trough; 10-Continuously variable transmission; 201-Connecting thread; 202-Steel pipe connecting groove; 203-Fixing buckle; 204-Fixing buckle groove; 205-Buckling control key; 207-Spring structure; 301-Steel pipe groove; 302-Transmission steel belt; 303-Fixing base; 304-Power motor; 11-Development ramp; 12-Vein roadway; 13-Strip stope; 14-Stop cutting and mining unit; 15-Through-vein roadway; 16-Belt conveyor roadway; 17-Mining panel A; 18-Mining panel B; 19-Ore body unit to be cut; 20-Mining cutting advance direction. Detailed Implementation

[0026] This invention provides a cutting device and mining method for cutting a full-thickness solid potash ore body in one operation.

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments. Example 1

[0028] Taking a potash mine in Laos as an example, the ore layer consists of easily soluble, monolithic potash-magnesium salt rocks, thick-layered massive carnallite rocks, carnallite-potassium halite rocks, hydrated magnesium chloride halite halite rocks, and exudate carnallite rocks. The top plate is buried at a depth of 189.15–528.30 m, with an average of 397.72 m, indicating a buried type. The thickness ranges from 4.28–237.88 m, with an average of 87.19 m. The dip is gentle, the rock mass is dense and intact, easily soluble, and has a compressive strength of 7.30–9.50 MPa. It belongs to an extremely weak rock group with poor stability. The immediate top plate is easily soluble, thick-layered massive halite rocks, which are dense, intact, easily soluble, and brittle, with a compressive strength between 12.6 and 31 MPa, with an average of 23.57 MPa, indicating relatively high compressive strength. It belongs to a weak rock group with poor stability; the immediate base is a thick, easily soluble massive halite rock with a considerable thickness, with an average borehole penetration thickness of 38.76m and a sedimentary thickness of more than 258.72m. The rock mass has an intact structure, is water-free, has relatively high rock mechanical strength, and good stability.

[0029] The design considerations for the mining method are as follows: 1) The ore layer is characterized by its solubility in fresh water; 2) Fresh water is not allowed to enter the ore deposit; the stability of the strata must be ensured. 3) Roof collapse is not permitted; the stability of the mining area must be ensured. 4) High degree of mechanization, with large-scale and highly efficient equipment.

[0030] The mining method adopts a panel layout, in which the panel is divided into strip stops, and the strip stops are further divided into different cutting units. The stops are mined sequentially, and no pillars are reserved during the mining process.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, this is a cutting device for mining full-thickness solid potash ore in a single operation. The device mainly consists of a main load-bearing steel pipe 3, an ore cutting machine 6, an ore crusher 7, an upward drive motor 2, and a flexible ore transport pipeline 4. The entire device is divided into two parts: the upper part is the cutting and crushing component, and the lower part is the drive component. The lower part of the device is the drive component, which has a built-in motor. When the motor starts, the drive component rotates and rises, pushing the crushing and cutting components upward to cut the ore body.

[0032] The drive component is an upward drive motor, which mainly provides the pressure for cutting the ore upwards. A mechanical structure matching the concave thread of the upward drive motor is installed on the outside of the main load-bearing steel pipe. The power motor 304 transmits power to the mechanical structure via a transmission steel belt 302. A high-power type of power motor 304 is selected. When the motor is started, the entire drive component moves upwards, providing upward pressure to the drill bit. Simultaneously, the drive component is designed with a corresponding cutting device and anti-fall safety 5 to prevent the entire equipment from moving downwards.

[0033] The mechanical structure includes a fixed base 303, on which the power motor 304 is mounted. The inner protruding thread of the rotating ring of the fixed base 303 matches the concave thread of the main load-bearing steel pipe. The outer side of the rotating ring is connected to the rotating shaft of the power motor 304 through a transmission steel belt 302.

[0034] Both the ore body cutter 6 and the ore body crusher 7 are mounted on the equipment operating platform 1, and their motors are independent components. The ore body cutter 6 is equipped with a stepless speed regulator 10, which is connected to the ore cutting drill bit. A square-hole drill bit (manufactured based on the principle of a circular arc triangle) is selected. When the power motor 304 is started for ore cutting, the cutting area is square. For long, narrow ore blocks, using a square cutting drill bit for potash ore cutting is highly adaptable, effectively avoids residual ore, and facilitates on-site production management. Furthermore, potash ore is a soft salt ore body, resulting in high cutting efficiency.

[0035] A ore crusher 7 is installed on one side of the ore body cutter 7. An inclined ore chute 9 is installed above the ore crusher 7. The ore cut and falling falls into the ore crusher 7 through the inclined ore chute 9. The ore crusher 7 crushes the ore and then transports the ore powder to the conveyor belt at the bottom of the stope through the lower flexible conveyor pipe 4. The entire living environment is relatively enclosed, with less dust generated on site. Furthermore, installing the cutting equipment and crusher at the end of the stope effectively avoids the generation of large ore pieces, eliminating the need for secondary crushing.

[0036] The main load-bearing steel pipe 3 is composed of multiple spliced ​​sections. Adjacent pipe sections have corresponding fixing slots 204 and fixing clips 203 at their joints. Adjacent pipe sections are connected by threads 201. When the two pipe sections are tightened by rotation, during installation, the fixing clips 203 are released by pressing the spring-loaded mechanism, locking the two pipe sections in place. During disassembly, the fixing clips 203 are returned to their original position before rotational disassembly. This locking device design ensures a more secure connection between the load-bearing steel pipes 3, enhancing the stability of the equipment operation. In field use, the pipes are installed on the upper plate of the ore body using specialized equipment and gradually lowered from top to bottom. A specific support platform is installed on the lower plate of the ore body.

[0037] The development project's roadways mainly include inclined ramps, conveyor belt roadways, along-vein transport roadways, return air roadways, and cross-vein roadway 15, which is located on both the hanging wall and footwall of the ore body. Ventilation roadways are drilled from the footwall to the hanging wall using the ore body cutting machine 6. To enhance the overall mine ventilation, return air roadways need to be developed in advance between the hanging wall and footwall sections. The return air roadways are supported by shotcrete and bolts, with a net cross-section of 21 square meters and a tunneling cross-section of 23 square meters.

[0038] As attached Figure 4 As shown, the ore body mining utilizes an inclined ramp development system, primarily to facilitate the operation of the mine's self-propelled equipment. Ore transportation employs belt conveyor inclined shafts, with a design slope of 7-15 degrees. The roadway cross-section is rectangular or a three-centered arch shape, with a cross-sectional area of ​​21 square meters. The roadway cross-section is supported by shotcrete and bolts. External haulage roadways and panel haulage roadways are designed as rectangular, also supported by shotcrete and bolts, with a design width of 8 meters and a height of 4 meters.

[0039] As attached Figure 5 The diagram shows the layout of the mining panels on a horizontal plane. The entire ore body is divided into multiple panels horizontally, with a panel width of 40m-100m and a panel length of 100-200m. Each panel is further divided into different stope cutting units by roadways, with 10-25 stops per panel. Mining operations within a single panel proceed from both sides towards the center.

[0040] As attached Figure 6The diagram shows the horizontal cutting unit arrangement of the strip stope 13. Ore cutting proceeds from both sides of the stope towards the center. Each cutting unit is square in shape, with a side length controlled between 4-6m. Square-hole ore-feeding drill bits are selected (based on the Reuleaux triangle principle). Based on an ore body thickness of 85m, the potash ore bulk density is calculated to be approximately 2.13 t / m³. 3 The ore volume of a single stope is approximately 82,600 tons, and the ore volume of a single panel ranges from 826,000 tons to 1,650,000 tons. Isolation pillars of 8-15 meters are reserved between panels. (See attached...) Figure 5 (A pillar needs to be reserved between the A17 and B18 mining panels) After all the ore on both sides of the isolation pillar has been mined, the isolation pillar will be mined.

[0041] As attached Figure 7 As shown, the ore cutting drill bit center is fixed by a steel rod (i.e., the main load-bearing steel pipe) arranged at the center of the cutting unit. A bearing base is installed at the lower part of the steel rod (and a base is also installed at the upper part). The device is electrically driven, and the cut and crushed ore body is transported to the mine's conveyor belt through a flexible ore transport pipeline. The ore mining equipment has a cutting speed of approximately 15m per day, and the production efficiency of a single working face is approximately 911.25t / d. Multiple working faces can operate simultaneously in each mine, with the specific number of working faces determined based on the mine's annual production targets.

[0042] A single cutting unit in the stope strip can simultaneously accommodate multiple ore body cutting devices for one-time mining of full-thickness solid potash ore, with a certain distance required between cuts. Ore crushing is conducted in a relatively enclosed space, resulting in less dust generation, lower ventilation pressure, and convenient transportation.

[0043] The ore body cutting device for cutting full-thickness solid potash ore in one pass uses an electric drive, which is more environmentally friendly than traditional hydraulic and diesel drives, and cuts the ore from bottom to top.

[0044] The cementing and backfilling materials selected are tailings salt, magnesium mortar, and adhesive powder. The solid phase in the magnesium mortar is hydrated magnesium chloride, with a density of 1.6 t / m³. 3 The liquid phase mainly consists of a saturated magnesium chloride solution with a density of 1.31 t / m³. 3 The cementing powder can be made from magnesite or dolomite through calcination, crushing, and ball milling. The active magnesium oxide in the cementing powder reacts with the magnesium chloride solution in the filler to cement the filler.

[0045] Backfill slurry mix proportions and parameters: Based on the requirements of backfill mining, the backfill strength is 0.2 MPa to 2 MPa. The magnesium oxide content in the binder powder is 97%. When the tailings salt:magnesium slurry ratio is 1.1:1, the binder powder:magnesium slurry liquid phase ratio is 1:6 to 1:18. The maximum compressive strength of the filling specimens at 3 days was between 0.28 MPa and 2.30 MPa.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A cutting device for cutting a solid potash ore body in a single mining operation, characterized in that: It includes a main load-bearing steel pipe, an ore body cutting machine, an ore body crusher, an upward drive motor, and a flexible ore transport pipeline. The bottom of the main load-bearing steel pipe is provided with a bearing base, and the surface of the main load-bearing steel pipe is provided with corresponding concave threads. The main load-bearing steel pipe is fitted with a matching equipment operating platform. The ore cutting machine is driven and controlled by an electric motor, which transmits power to the cutting drill bit through a power sensor shaft. The ore cutting machine and the ore crusher are respectively installed on the equipment operating platform, and the ore crusher transports ore powder through a flexible ore transport pipeline. The bottom of the equipment's operating platform is equipped with a lifting drive motor, the convex thread of which engages with the concave thread of the main load-bearing steel pipe; the bottom of the lifting drive motor is equipped with a cutting device to prevent falls. The lifting drive includes a mechanical structure that matches the thread of the main force-bearing steel pipe, and the mechanical structure transmits power to the power motor via a steel belt; The mechanical structure includes a fixed base, on which the power motor is mounted on a bearing plate. The inner side of the rotating ring of the fixed base matches the thread of the main load-bearing steel pipe, and the outer side of the rotating ring is connected to the rotating shaft of the power motor via a transmission steel belt. The ore cutting machine is connected to the ore cutting head via a stepless speed regulator, and the cutting drill bit is a square hole drill bit. The ore body cutting machine is equipped with an ore body crusher on one side. An inclined ore trough is provided above the inlet of the ore body crusher. The bottom outlet of the ore crusher is connected to the conveyor belt at the bottom of the mine through the flexible ore transport pipe. The main load-bearing steel pipe is a multi-section splicable steel pipe, and corresponding fixing buckle grooves and buckles are provided at two adjacent bare pipe joints.

2. A method for using the orebody cutting device for single-pass mining of full-thickness solid potash ore as described in claim 1, characterized in that, Includes the following steps: 1) Panel layout for stopes: The mining method adopts panel layout, and the panel is divided into strip stops. The stops are divided into cut bodies of the same size. The stops are mined sequentially, and no pillars are reserved. 2) During the excavation of the mining roadway, through-vein and along-vein roadways are arranged in the roof and floor of the ore body. The roadways in the roof and floor of the ore body are parallel, and a 2-5m isolation pillar is left between the two parallel roadways. The bottom of the roadway is hardened with concrete as a water-proof layer. 3) Drill holes in the potash ore body, drilling from the roof surrounding rock roadway to the floor surrounding rock roadway, with the drilling direction perpendicular to the cross-vein roadway, and the drilling penetrating the entire ore body, serving as the installation space for the main load-bearing steel pipe of the ore body cutting device for mining full-thickness solid potash ore in one go. 4) Equipment matching: First, place the main load-bearing steel pipe in the borehole, and then install the corresponding supporting equipment; 5) Start the ore body cutting machine to carry out the ore cutting operation. The ore body cutting machine cuts and cuts the ore body from bottom to top, cutting the strip cutting units one by one. Two adjacent cutting units can be cut at the same time, but there must be a gap in the cutting height. 6) Strip stope backfilling: After the strip stope ore body is cut, the strip stope is backfilled with tailings adhesive. After the backfill body bleeds water, the next strip stope mining operation can be carried out.

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