In-situ mining method and system for deep ore bed in submerged environment

Abstract

According to the deep ore bed mining method and system in the submerged environment, a large-diameter vertical shaft is drilled to a target ore bed, well cementation is carried out, a well mouth is sealed for pressurization, water is injected into a well shaft to construct the submerged environment, then an underwater mining robot is adopted to crush ores in situ in the submerged environment, and roof supporting is synchronously carried out according to requirements; and then the ore is lifted to the ground by the water-gas mixing and lifting system, and fine resource classification and purification are carried out. The submerged environment is constructed, so that the static pressure of water in the submerged environment can balance partial ground pressure, the influence of stress change on rock mass stability is reduced, safety accidents such as harmful gas outburst are reduced, sufficient water source supply is provided for high-pressure water jet rock breaking operation, and tool abrasion can be reduced. And meanwhile, an integrated technology of'submerged environment in-situ crushing-pipeline transportation-ground separation 'is adopted, so that a large amount of well building cost is reduced, automatic and intelligent control is easier to realize, continuous mining is carried out, and the operation cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of solid resource mining, and in particular to an in-situ mining method and system for deep mineral strata in a submerged environment, which is suitable for mining operations in deep mineral strata. Background Art

[0002] China is rich in mineral resources and has a long history of mining. It has now built a complete industrial system covering exploration, mining, transportation, processing and other links. China is the world's largest coal producer and consumer, with proven recoverable reserves of 143.197 billion tons; in 2025, my country's largest single bauxite mine was newly discovered in Xiaoyi, Shanxi, with an additional resource volume of 108 million tons; pyrite often exists in coal seams in the form of nodules or layers, and is especially enriched in coal-bearing strata in the southwest region (Guizhou and Yunnan).

[0003] With economic development, demand for coal and other mineral resources continues to grow, while shallow resources are gradually decreasing. Therefore, it is necessary to expand into deeper areas to meet energy needs. Deep coal and other mineral resources are abundant. Of these, deep coal resources buried at depths of 2,000 to 4,000 meters account for a whopping 58.95%, far exceeding shallow resources and posing enormous development potential. Furthermore, the exploitation of deep resources is of great strategic significance for increasing my country's energy self-sufficiency, ensuring national energy security, and reducing dependence on imported energy.

[0004] Deep mining is different from resource mining in shallow strata and presents many technical and economic difficulties. The stratum temperature, ground stress, stratum structure, hydrogeological conditions, etc. in deep strata are more complex, and there are more uncertainties. The reservoir formation mechanism and enrichment pattern of mine gas are also more complex, which brings unprecedented challenges to traditional mining technology. The development of deep mine gas has higher technical requirements for drilling, fracturing, drainage and pressure reduction, etc., all of which need to be specially designed and constructed for the special conditions of deep ore layers. Deep coal mining also faces technical difficulties such as deep support and deep ventilation. At the same time, the cost of deep mining is relatively high, including the cost of equipment investment, technology research and development, and mining operations. It is not as economical as shallow mining, and effective cost control measures must be taken to achieve commercial development.

[0005] In recent years, with the increasing demand for deep stratum resource extraction, various parties have taken a series of measures to address the difficulties in mining. Technically, relevant scientific research teams have increased their R&D investment to overcome key technologies. Precision detection technology can accurately grasp the deep geological conditions and provide a basis for mining. Anchor injection and spraying coordinated support and deep soft rock engineering coupled support technology have solved the problem of tunnel support. Deep well full-section hard rock excavation technology equipment and integrated excavation, support and transportation fast excavation technology have improved the efficiency of deep mining and excavation. Harmful gas control adopts coordinated measures from top to bottom, shifting to a model that is mainly ground-based and supplemented by underground. Long boreholes can achieve "multiple uses of one hole" and reduce the risks of underground drilling. Water hazard control promotes the "surface-based, underground-assisted" model, such as the intelligent ground grouting support system of Zhaogu No. 1 Mine.

[0006] Existing technologies address fluidized transportation in deep strata mining, such as "An Underwater Mobile Mining and Transportation Device," with application number CN 115059464 A; and "A Deep Coal Fluidized Pipeline Transportation System," with publication number CN 113404490 A. However, these solutions target the existing groundwater environment within deep strata, which presents numerous unsafe factors and increases the risks of deep mining. Natural groundwater is fragmented by fault networks, creating turbulent, multi-path flows that are difficult to simulate and predict. The water's composition is complex, containing high concentrations of minerals and trace amounts of heavy metals, making it susceptible to corrosion of equipment and contamination of ore. Furthermore, deep mining, when disturbing confined aquifers, can cause sudden water level drops and ground subsidence, damaging infrastructure and blocking transportation routes. High ground stress areas, combined with water pressure fluctuations, can easily trigger "group water pressure failure," leading to roof collapse or tunnel flooding. These technologies only solve the mining and transportation operations of the main equipment in natural water-bearing strata, but they do not provide a comprehensive solution to the high-temperature, high-and-low-pressure geological environment of deep strata. They do not consider the impact of ground pressure on the safe operation of equipment and the stability of coal seams, the wear and failure of cutters during mechanical cutting of coal seams, and the softening and instability of coal seam roofs due to water, which may lead to equipment damage. They do not consider the geological conditions of the ore deposits, and may face a situation of high mining costs, large amounts of harmful gas outbursts, and many other safety accidents, resulting in poor mining results.

[0007] In general, the limitations of existing technologies in deep mining are as follows: 1. Mining Efficiency and Economy: Deep resource mining is complex, characterized by high formation temperatures, high geostress, and complex hydrogeological conditions. This increases well construction requirements, necessitating specialized deep support and ventilation, exacerbating equipment wear and reducing mining efficiency. The high cost and environmental impact of deep mining are challenges that existing technologies struggle to overcome, resulting in high costs.

[0008] 2. Safety and Environmental Protection: Traditional mining methods are unable to effectively control the rock stability issues caused by pressure relief during mining, leading to equipment damage and increased risk of geological disasters due to the high temperatures and high pressures of deep formations. The issues of harmful gas emissions, dust pollution, tailings disposal, and water hazard control during the mining process have not been effectively addressed, impacting the continuity, safety, and economic viability of mining operations. Summary of the Invention

[0009] Based on a deep understanding of the shortcomings of existing technologies, this application proposes a new in-situ mining method and system for deep mineral layers in submerged environments, aiming to overcome the above-mentioned technical challenges, solve the technical problems of low mining efficiency, severe equipment wear, difficulty in geological disaster prevention and control, and low resource recovery rate in deep mineral layer mining in existing technologies, and improve the safety, efficiency and economy of deep mineral resource mining.

[0010] The technical solution of this application is as follows: On one hand, the present application proposes a method for in-situ mining of deep mineral layers in a submerged environment. In a deep solid resource-bearing environment, water is injected into a wellbore to create a submerged environment suitable for safe and efficient mining at the deep mineral layer. An underwater mining robot is used for mining operations, and the solid resources are converted into slurry, which is then collected and separated through a transportation pipeline. The method comprises the following steps: (1) Drilling: Drilling creates large-diameter vertical and horizontal wells that match the depth of the target ore layer, and cementing them to ensure that the roof height of the horizontal well matches the height of the underwater mining robot. The underwater mining robot is lowered and connected to the water and gas lifting system. Here, drilling technology is used to form a shaft structure that matches the depth of the target ore layer, ensuring that the underwater mining robot can enter and operate smoothly, thereby improving the stability and safety of the shaft structure.

[0011] (2) Pressurization to create a high-pressure environment: After pressurizing the wellbore, the wellhead is sealed to provide a high-pressure environment inside the wellbore. The pressure range is greater than the rock closing pressure but less than the rock fracture pressure, so that the roof is in a stable pressure state, and the well is sealed, forming a suitable pressure gradient to facilitate the mining operation of the underwater mining robot. The core purpose of building a high-pressure environment is to achieve the stability of the roof rock layer, inhibit fluid crossflow, and ensure the safety of closed operations by actively controlling the annular pressure, thereby creating safe and efficient mining conditions for underwater mining robots. By accurately controlling the pressure between the rock closing pressure and the fracture pressure, the stress of the overlying rock layer can be effectively offset, preventing the roof from collapsing or crack expansion due to stress release. This pressure range ensures that the rock layer is in an elastic compression state to avoid rock layer closure deformation, and avoids the generation of hydraulic fractures due to overpressure. In addition, the high-pressure environment can inhibit the risk of formation fluid intrusion and sudden surge, forming a positive pressure barrier, so that the liquid column pressure in the wellbore is continuously higher than the formation pore pressure, blocking groundwater, gas or pollutants from flowing into the operating area through cracks, and ensuring the safety of robot operations. The stable high-pressure gradient can regulate the flow state of ore transportation, promote the uniform suspension of crushed ore particles in the pipeline, and reduce the risk of sedimentation and blockage. At the same time, the high-pressure environment suppresses water turbulence and reduces disturbances in robot positioning and collection.

[0012] (3) Water injection to create a submerged environment: Connect the screening system outside the wellhead with the underground water and gas lifting system, and inject water into the annulus of the wellbore casing until a submerged environment is formed. The water level in the horizontal well section is close to the top of the ore layer to simulate suitable mining conditions.

[0013] Through the above three steps, a submerged environment is artificially constructed in the target deep mineral layer. This fully submerged state environment of artificial pressurization and water injection is different from the partial submergence state of groundwater in the natural environment. The submerged environment artificially constructed by this method can balance part of the ground pressure through the static pressure of water, relieve stress concentration, reduce the impact of stress changes on rock stability, reduce safety accidents such as harmful gas outbursts, and prevent disasters such as dust and harmful gas explosions, thereby ensuring safe underground operations.

[0014] (4) Mining and support: Underwater mining robots carry out mining and use water jets to crush the ore body. After mining, according to the monitored dynamic response of the surrounding rock, the positions that need support are supported as they are mined. The underwater mining robots spray the pre-stored concrete slurry onto the roof of the ore layer at high pressure to form a cementing layer as mining support in a submerged environment. When supporting, by controlling the setting time of the concrete slurry and matching the displacement of the roof, immediate support is carried out to achieve continuous mining line operation. The high-pressure water for water jet rock breaking is extracted from the submerged environment through a water injection pipeline.

[0015] (5) Slurry ore body: The crushed ore body is collected, sucked and crushed into a slurry ore body by an underwater mining robot. The internal screening mechanism of the mining robot screens and filters the ore body according to the particle size. The small-volume ore body enters the conveying pipeline through the screening net for direct flow transportation. The large-volume ore body is screened and filtered, and then crushed by the crushing mechanism and enters the conveying pipeline.

[0016] (6) Water-gas mixing and lifting, screening: The slurry ore body enters the water-gas mixing and lifting system through the conveying pipeline, is sucked to the wellhead under high pressure conditions, and is washed and separated by the screening system to achieve the recovery of high-purity resources.

[0017] The above technical solution provides a complete in-situ mining method for deep mineral seams under submerged conditions, encompassing key steps such as establishing a submerged environment, underwater mining, ore slurry transportation, and resource washing and separation. This represents a revolutionary deep mining method. This deep submerged rock breaking method offers numerous advantages over conventional water jet mining. Rock breaking operations in submerged environments are supported by an ample water supply, maintaining efficient rock breaking. The incompressibility of water and its confining effect on the jet flow reduce energy transfer losses and prevent excessive jet diffusion, concentrating energy on the rock surface and significantly improving rock breaking efficiency. Furthermore, the hydrodynamic crushing mechanism in submerged environments achieves continuous energy supply through a self-sustaining fluid medium. The lubrication and cooling effects of the submerged working conditions significantly reduce the wear and failure rate of mechanical tools, eliminating the need for periodic replacement and maintenance. Furthermore, the hydrostatic pressure of water can partially balance ground pressure, alleviate stress concentrations, reduce the impact of stress changes on rock stability, and mitigate safety incidents such as gas outbursts. Furthermore, water in submerged environments can prevent hazards such as dust and gas explosions, ensuring safe underground operations. In terms of deep-earth resource mining, the integrated technology of "in-situ crushing in submerged environment - pipeline transportation - ground separation" is used to better adapt to the deep high-temperature and high-pressure environment, reduce a large amount of well construction costs, alleviate the impact of high temperature on equipment through the cooling effect of water, reduce the probability of equipment damage, extend the service life of equipment, and make it easier to realize automation and intelligent control for continuous mining, thereby reducing operating costs.

[0018] Preferably, the concrete slurry used in the mining method contains lightweight aggregate, which has a density less than that of water and can form a buoyant layer underwater, allowing the cementitious layer to float above the water surface, effectively isolating the roof concrete cementitious layer from direct contact with water, preventing water from damaging the concrete's bond quality and causing roof collapse. The lightweight aggregate concrete comprises lightweight aggregate, cement, water, and admixtures. It has a density of 800-1000 kg / m³ (dry apparent density), a compressive strength of 25-50 MPa, a tensile strength of 3-10 MPa, an elastic modulus of 50-70% of that of the same strength grade, freeze-thaw resistance of F300, and impermeability of P12.

[0019] Preferably, the underwater mining robot produces broken ore bodies after cutting the ore layer with high-pressure jets, and its collection device breaks up large pieces of ore bodies through the mining head and sucks water, and collects the fluid mixture of solid resources through the collection pipe; small-volume ore bodies can directly enter the conveying pipeline through the screening net, and large-volume ore bodies are filtered by the screening net and flow through the crushing mechanism to be crushed and then flow to the conveying pipeline.

[0020] Optimally, the water-gas ratio is dynamically adjusted during the water-gas mixing process to optimize gas lift efficiency and conveying stability, ensuring uniform suspension of ore particles in the closed pipeline and efficient conveying to the surface washing stage. Specifically, the water-gas ratio is dynamically adjusted based on changes in ore particle size and concentration. This method overcomes the problems of traditional mechanical conveying, such as high wear, high energy consumption, and clogging, and improves the efficiency and stability of ore conveying.

[0021] Another aspect of the present application provides a submerged jet solid resource in-situ slurry mining and transportation system to implement the aforementioned mining method. The system includes: a deep mineral layer submerged environment construction system, an underwater mining robot, a water-gas mixing and lifting system, and a resource washing and separation system. The deep mineral layer submerged environment construction system is used to construct a submerged environment at the deep mineral layer location by drilling, pressurizing, and injecting water into the wellbore. The underwater mining robot is used to carry out mining operations in the deep mineral layer submerged environment, while providing support, performing high-pressure water jet rock breaking on the target mineral layer, collecting the ore body and converting it into a slurry ore body in situ. The water-gas mixing and lifting system connects the underwater mining robot and the resource washing and separation system, lifts the slurry ore body through water-gas mixing, and pumps it to the wellhead under high pressure conditions. The resource washing and separation system is arranged at the wellhead and is used to separate and purify the slurry ore body transported by the water-gas mixing and lifting device system, thereby realizing the recovery of high-purity resources.

[0022] Preferably, the system for constructing a submerged environment in a deep mineral seam includes a drilling rig, a wellhead pressurizing device, and a water injection device. The drilling rig is used to drill large-diameter vertical and horizontal wells that match the target mineral seam depth, and to cement the wells, ensuring that the roof height of the horizontal wells matches the height of the underwater mining robot. The wellhead pressurizing device is used to pressurize the wellbore and seal the wellhead, providing a high-pressure environment within the wellbore, maintaining a stable pressure state for the roof, and ensuring a tight seal downhole, creating a suitable pressure gradient. The water injection device is used to inject water into the annular space within the wellbore casing until the water level in the horizontal well section approaches the mineral seam roof, thereby creating a submerged environment. Therefore, through the synergistic action of the drilling rig, the wellhead pressurizing device, and the water injection device, a submerged environment in the deep mineral seam is constructed. The drilling rig forms the wellbore structure, the wellhead pressurizing device provides the high-pressure environment, and the water injection device creates the submerged conditions. Together, these three functions achieve the construction of a submerged environment in the deep mineral seam, ensuring that the underwater mining robot can operate in a suitable submerged environment and improving mining efficiency and safety.

[0023] Preferably, the underwater mining robot comprises a jet rock breaking mechanism, a grouting mechanism, a mining and transportation mechanism, and a migration mechanism installed on the body.

[0024] The grouting mechanism includes a slurry bin, a pressure pump, a grouting pipeline and a grouting nozzle connected in sequence; the slurry bin sucks concrete slurry and pressurizes it through the pressure pump, and then sprays the concrete slurry through the grouting pipeline and the grouting nozzle to the top plate of the mine layer to perform support operations.

[0025] The jet rock breaking mechanism includes a jet nozzle, a pressure pump, a water injection pipeline and a water pump; the jet rock breaking mechanism absorbs the flooded environment water through the water pump and then forms high-pressure water through the pressure pump, which is transported to the jet nozzle through the water injection pipeline to crush the ore body through the jet.

[0026] The mining and transportation mechanism includes a connected mining head, a collection pipe, a screening net, a crushing mechanism and a conveying pipeline; the mining head is responsible for collecting the ore body after jet crushing, and after the large ore body is crushed once, it is transported to the screening net by the collection pipe. The ore body flows into two branches, small-volume ore blocks are directly transported through the conveying pipeline, and large-volume ore blocks are crushed twice by the crushing mechanism and then transported through the conveying pipeline.

[0027] The migration mechanism provides power to the underwater mining robot to move in the horizontal well section.

[0028] The underwater mining robot integrates multiple functions such as collection, crushing, transportation, migration and support, and realizes efficient crushing and slurrying of the ore body through various devices on the body, thereby improving the functional integration and operation efficiency of the underwater mining robot, simplifying the mining operation process, and reducing mining costs.

[0029] The mining method and system of the present application construct a submerged environment in a deep ore layer and utilize in-situ mining technology in the submerged environment. By constructing the submerged environment, the static pressure of the water in the environment can balance part of the ground pressure, reducing the impact of stress changes on rock stability and reducing safety accidents such as harmful gas outbursts. The artificial submerged environment can actively transform risks into controllable parameters, stabilize water level fluctuations through artificial water injection, customize low-mineral water quality, reduce corrosion risks, and use a sensor network to monitor anomalies in real time and automatically respond. At the same time, the water used for jet blasting is directly taken from the submerged environment, and the crushed slurry is lifted to the surface, reducing the cost of external water supply and wastewater treatment. In addition, the high-pressure water jet rock blasting operation has an adequate water supply, which can reduce tool wear. At the same time, the integrated technology of "in-situ crushing in a submerged environment - pipeline transportation - ground separation" is adopted to reduce a large amount of well construction costs, make it easier to achieve automation and intelligent control for continuous mining, and reduce operating costs.

[0030] The specific advantages of this application are as follows: 1. A unique submerged environment is created to ensure the safety and efficiency of the mining robot's underground operations. A pressurizing device is installed at the wellhead to provide high pressure inside the wellbore, adjusting the operating pressure to a level greater than the rock closing pressure but less than the rock cracking pressure, maintaining a stable roof pressure. The appropriate pressure gradient and the shotcrete injection of the underwater mining robot's grouting support system ensure the rock roof remains strong and stable during operations, preventing rock softening caused by the submerged environment and rock loosening due to mining pressure relief.

[0031] 2. Taking advantage of the sufficient water supply in the submerged environment, the efficiency of water jet crushing of ore bodies is improved, production costs are reduced, and efficient rock breaking can be maintained. In addition, the lubrication and cooling effects based on the submerged working conditions can significantly reduce the wear and failure rate of mechanical tools, thereby eliminating the need for periodic replacement and maintenance.

[0032] 3. Effectively prevent and control geological disasters such as harmful gases, dust, and impact ground pressure. The mining robot is in a completely submerged state of artificial water injection, which is different from the partial submergence of groundwater in the natural environment. The static pressure of water can balance part of the ground pressure, relieve stress concentration, reduce the impact of stress changes on rock stability, reduce safety accidents such as harmful gas outbursts, and prevent disasters such as dust and harmful gas explosions to ensure safe underground operations.

[0033] 4. Realize real-time intelligent perception and control of underground operations. Through a multi-dimensional sensor network, collect underground environmental parameters, equipment operating status, and resource processing process data in real time, and build a dynamic digital model to achieve transparent monitoring of the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of an exemplary in-situ mining system for deep mineral formations in a flooded environment according to the present application; Figure 2 This is a flow chart of an exemplary in-situ mining method for deep mineral formations in a flooded environment according to the present application.

[0035] Figure numerals: 1. Mining head; 2. Collection pipe; 3. Screening net; 4. Crushing mechanism; 5. Transportation pipeline; 6. Water pump; 7. Migration mechanism; 8. Concrete silo; 9. Pressure pump I; 10. Grouting pipeline; 11. Grouting nozzle; 12. Pressure pump II; 13. Water injection pipeline; 14. Jet nozzle; 15. Lifting pipe; 16. Casing; 17. Water tank; 18. Wellhead pressurizing device; 19. Valve; 20. Flow monitoring meter; 21. Resource washing and separation system; 22. Power station; 23. Cable; 24. Centrifugal pump. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clarified below with reference to the drawings in the embodiments of the present application.

[0037] For example, Figure 1 As shown, the in-situ mining system for deep mineral seams in a submerged environment includes a deep mineral seam submerged environment construction system, an underwater mining robot, a water-gas mixing and lifting system, and a resource washing and separation system.

[0038] Exemplarily, the deep mine flooding environment construction system includes a drilling device, a wellhead pressurizing device and a water injection device.

[0039] The drilling rig is used to drill large-diameter vertical and horizontal wells that match the depth of the target ore layer, and to cement the wells to ensure that the roof height of the horizontal wells matches the height of the underwater mining robot.

[0040] Exemplarily, the wellhead pressurizing device 18 can adopt a conventional device structure in the field, such as a valve 19, a liquid / pneumatic drive system, a multi-stage sealing ring, a pressure sensor, etc., which is used to seal the wellhead after pressurizing the wellbore, provide a high-pressure environment inside the wellbore, keep the top plate in a stable pressure state, and ensure that the well is sealed to form a suitable pressure gradient.

[0041] Similarly, the water injection device can also adopt a conventional device structure in this field, such as a water tank 17, a regulating valve, a controller, a water injection pump, a check valve, a water level sensor, etc., which is used to inject water into the annulus inside the casing of the wellbore until the water level in the horizontal well section is close to the top plate of the ore layer, forming a flooded environment.

[0042] Through the coordinated action of the above-mentioned drilling equipment, wellhead pressurizing device and water injection device, a submerged environment of deep mineral layers is constructed, which can ensure that underwater mining robots can operate in a suitable submerged environment and improve mining efficiency and safety.

[0043] Exemplarily, the underwater mining robot includes a mining head 1, a collection pipe 2, a screening net 3, a crushing mechanism 4, a conveying pipeline 5, a water pump 6, a migration mechanism 7, a concrete silo 8, a pressure pump 9, a water injection pipeline 13, a grouting pipeline 10, a grouting nozzle 11, a jet nozzle 14, etc., which constitute a jet rock breaking mechanism, a grouting mechanism, a mining and transportation mechanism, and a migration mechanism.

[0044] The grouting mechanism includes a concrete silo 8, a pressure pump 9, a grouting pipeline 10, and a grouting nozzle 11 connected in sequence. The concrete silo 8 sucks concrete and pressurizes it through the pressure pump 19. The concrete is then sprayed through the grouting pipeline 10 and the grouting nozzle 11 onto the roof of the ore layer to perform support operations.

[0045] The jet rock breaking mechanism includes a jet nozzle 14, a pressure pump II 12, a water injection pipeline 13, and a water pump 6. The jet rock breaking mechanism draws water from the submerged environment through the water pump 6, generates high-pressure water through the pressure pump II 12, and then delivers it to the jet nozzle 14 through the water injection pipeline 13 to break the ore body by jetting.

[0046] The mining and transportation mechanism consists of a connected mining head 1, a collection pipe 2, a screening screen 3, a crushing mechanism 4, and a conveying pipeline 5. The mining head 1 is responsible for collecting the ore body after jet crushing. After primary crushing of large ore bodies, the ore body is transported to the screening screen 3 through the collection pipe 2. The ore body flows into two branches. Small ore blocks are directly transported through the conveying pipeline 5, while large ore blocks are crushed again by the crushing mechanism 4 and then transported through the conveying pipeline 5.

[0047] The migration mechanism 7 provides power to the underwater mining robot to move in the horizontal well section.

[0048] An underwater mining robot employing the above-described structure can move on the surface of a reservoir in a submerged environment to conduct mining operations. A power mechanism within the migration mechanism 7 provides power to the entire device, enabling the mining and transportation device to move on the reservoir surface and cut the ore layer. A concrete silo 8 stores concrete slurry. Before cutting the ore layer, the concrete slurry passes through a grouting line 10 and flows through a pressure pump 9 to form a high-pressure slurry. This slurry is then sprayed out of a grouting nozzle 11 and cemented to the ore layer roof. Shotcrete cements pre-existing cracks in the roof and reduces the adverse effects of the submerged environment on the roof, maintaining its stability. After preparatory work for cutting the ore layer is completed, a water jet is used to crush the ore body. A water injection line 13 draws water from the submerged environment through a water pump 6. After being pressurized by a pressure pump 12, the high-pressure water is sprayed out of a jet nozzle 14 to crush the ore layer. The mined ore body falls into the water, where the mining head 1 draws the water and crushes the ore body. The collection pipe 2 collects the fluid mixture of solid resources. After cutting the ore body, ore bodies of different volumes are generated. Small-volume ore bodies can directly enter the conveying pipeline 5 through the screening net 3. Large-volume ore bodies are filtered by the screening net and flow through the crushing mechanism to be crushed and then flow to the conveying pipeline. The conveying pipeline 5 passes through a device connected to the oil pipe 15 and flows toward the wellhead through the action of the centrifugal pump 24.

[0049] Exemplarily, the water-gas mixing lifting system includes a lifting pipe 15, a centrifugal pump 24, and a flow meter 20. Under high-pressure submersion, the water-gas mixing lifting system dynamically adjusts the water-gas mixture ratio to accommodate varying ore particle sizes and concentrations, effectively overcoming the problems of high wear, high energy consumption, and clogging associated with traditional mechanical conveying. Simultaneously, the intelligent control system optimizes gas lift efficiency and conveying stability in real time, ensuring uniform suspension of ore particles within the sealed pipeline and efficient transport to surface washing, thus addressing the continuity, safety, and economic requirements of mining operations under complex geological conditions. After the underwater mining robot breaks rock with a jet, the crushed ore flows toward the wellhead through the suction action of the water-gas mixing lifting system's centrifugal pump.

[0050] Exemplarily, the resource washing and separation system 21 is arranged at the wellhead, and uses multi-stage physical or chemical sorting technology to accurately separate and purify the slurry of ore transported to the ground by the water-gas mixing lifting system. It uses parameters such as density difference, particle size distribution or mineral surface characteristics to dynamically control the sorting conditions, efficiently stripping impurities and associated minerals in the ore, and achieving high-purity enrichment of target resources and simultaneous recovery of multiple categories. The system can combine the mineral component data fed back by intelligent sensing to adaptively adjust the operating parameters of the sorting equipment. Through the coupling of process chains such as hydrocyclone, flotation, magnetic separation or chemical leaching, it not only ensures the maximization of resource recovery rate, but also can carry out environmentally friendly treatment and recycling of waste slag and wastewater generated during the mining process, ultimately forming a concentrate product that meets industrial standards, while supporting the greening and resource-based closed-loop management of the entire resource mining process.

[0051] Preferably, the system can also be configured with an intelligent perception and control system, which collects underground environmental parameters, equipment operating status and resource processing process data in real time through a multi-dimensional sensor network, deeply integrates multi-source information such as water pressure, temperature, ore slurrying process, gas-liquid mixing ratio, support structure stress, etc., and constructs a dynamic digital model to achieve transparent monitoring of the entire process. The wellhead booster pump provides high pressure to the inside of the wellbore and adjusts the appropriate operating pressure. The underground operating pressure is greater than the rock closing pressure and less than the rock cracking pressure, so that the top plate is in a stable pressure state. Under the action of the appropriate pressure gradient and the sprayed concrete of the grouting support system of the underwater mining robot, the rock top plate is guaranteed to be hard and stable during operation, preventing rock softening caused by the submerged environment and rock loosening caused by mining pressure relief. The flow monitor 20 can realize real-time monitoring of the ratio and corresponding flow of gas phase and solid phase in the slurry solid resource. The separation of resources can be achieved through the solid-liquid separator, which is conducive to purification and extraction.

[0052] In addition, the system is also equipped with a power system, through which the power from the power station 22 is transmitted by cable 23 to various systems such as the deep mine flooding environment construction system, underwater mining robot, water-gas mixing and lifting system, and resource washing and separation system.

[0053] The following further describes in detail the method for realizing slurry mining of solid resources by submerged jet using the above system.

[0054] For example, see Figure 2 The submerged jet solid resource slurry mining method mainly includes the following steps: The first step is drilling: a large-diameter vertical shaft and a horizontal well are drilled to match the target ore depth. Casing is then used to cement the wells, ensuring the roof height of the horizontal well matches the height of the underwater mining robot. The underwater mining robot is lowered and connected to the water-air lift system. The diameter and dimensions of the riser pipe 15 are determined. Drilling technology is used to create a wellbore structure that matches the target ore depth, ensuring smooth entry and operation of the underwater mining robot, and improving the stability and safety of the wellbore structure.

[0055] The second step is to pressurize and create a high-pressure environment: a pressurizing device 18 is installed at the wellhead to pressurize the wellbore to provide a sufficiently high pressure for the wellbore, and then the wellhead is sealed by a valve 19 to provide a high-pressure environment inside the wellbore. The pressure range is greater than the rock closing pressure but less than the rock fracture pressure, so that the top plate is in a stable pressure state and the well is kept airtight, forming a suitable pressure gradient to facilitate the mining operation of the underwater mining robot.

[0056] In this step, the rock closure pressure P c : The minimum pressure to keep the rock layer from cracking is about 1.2 to 1.5 times the pressure gradient of the overlying rock layer (22.62 kPa / m), that is: PC =(1.2∼1.5)×22.62× H (kPa). Rock fracture pressure P f The critical pressure for the formation of new fractures is determined by the formation fracture pressure gradient, generally ranging from 0.015 to 0.025 MPa / m (i.e., 15 to 25 kPa / m). The pressure gradient must satisfy the following conditions: closure pressure gradient < set gradient < initiation pressure gradient. At depths of 1500 to 2000 meters, the closure pressure gradient is approximately 18 to 27 kPa / m, and the initiation pressure gradient is approximately 15 to 25 kPa / m. Therefore, the actual set gradient should be controlled between 18 and 25 kPa / m, close to the lower limit to prioritize roof stability.

[0057] The third step is to inject water to create a submerged environment: connect the device at the wellhead, connect the resource washing and separation system 21 outside the wellhead with the underground water and gas lifting system, inject water into the annulus inside the casing 16 of the wellbore until the water level of the horizontal well approaches the roof height, then stop injecting water to form a submerged environment, and simulate mining the stratum under submerged environment conditions underground.

[0058] Through the above three steps, the artificial construction of a submerged environment in the target deep mining layer is completed. This fully submerged state environment of artificial pressurization and water injection is different from the partial submergence of groundwater in the natural environment. The artificially constructed submerged environment of this method can balance part of the ground pressure through the static pressure of water, relieve the degree of stress concentration, reduce the impact of stress changes on rock stability, reduce safety accidents such as harmful gas outbursts, and prevent disasters such as dust and harmful gas explosions, thereby ensuring safe underground operations.

[0059] Step 4: Mining and Support: Mining is carried out using underwater mining robots, and the ore layer is crushed by water jets. The water injection pipeline 13 draws water from the submerged environment and passes it through the water injection pipeline. High-pressure water is then injected through the pressure pump 12 to crush the ore layer. During the mining process, the jet pressure and flow rate are dynamically matched according to the characteristics of the coal and rock. Optical sensors monitor the cohesion length and turbulence of the jet morphology and nozzle status to maintain impact focus. Microseismic sensors monitor hardness and crack density in real time. 3D scanning and image recognition are used to monitor the crushed volume and particle size distribution. When the proportion of large particles exceeds a threshold, the crusher power is increased to 90% of the rated value, and feedback is used to adjust the jet parameters.

[0060] In this step, the ore layer is broken by water jetting. The high-pressure water is extracted from the submerged environment through the water injection pipeline, which optimizes the system structure, reduces energy consumption, and improves environmental adaptability and operational sustainability. In deep stratum environments, the traditional method of pumping high-pressure water from the surface requires overcoming a huge head. However, directly extracting the submerged water body completely eliminates the vertical water pipeline, reducing the overall energy consumption by 40-50%. At the same time, because the temperature and density of the water body in the operating area are consistent with the ore body, the jet cavitation anomaly caused by external water injection is avoided. Moreover, continuous jetting in the submerged environment easily forms a "water cushion layer" on the surface of the ore body to weaken the impact force, which increases the crushing efficiency compared to mechanical tool cutting mining. In addition, the jet breaks the stress balance of the ore body and expands the fracture network combined with the water wedge effect, greatly improving the gas extraction efficiency. Therefore, through artificially constructed submerged environments, the environment of deep submerged water bodies is transformed into an integrated resource of "in-situ water extraction-stress collaborative crushing-closed-loop transportation", and the three major bottlenecks of high-altitude stress crushing, large energy loss over long distances, and low efficiency are overcome simultaneously, providing an irreplaceable technical path for deep mining and realizing the dialectical unity of environmental resources and engineering goals.

[0061] At the same time, during mining, the dynamic response of the surrounding rock is monitored in real time. Based on the monitored dynamic response of the surrounding rock, shotcrete support is carried out on areas that require support after mining. As mining progresses, underwater mining robots spray pre-stored concrete slurry at high pressure onto the roof of the ore layer, forming a cementing layer. This serves as mining support in submerged environments, enhancing the stability of the roof and preventing softening due to water immersion. Shotcrete can cement the original cracks in the roof. The lightweight aggregate concrete used has a density less than water and can float on the water surface, ensuring that the roof does not come into contact with the water surface and thus does not soften, maintaining the stability of the roof. It is a special support method for mining in submerged environments. During support, by controlling the setting time of the concrete slurry and matching the displacement of the roof, immediate support is provided to achieve continuous mining line operations.

[0062] During support operations, spraying pressure and flow rate are key construction parameters. The target range for high-pressure pump outlet pressure is 18–25 MPa, and flow rate fluctuation must be ≤5% to prevent insufficient pressure from loosening the cementitious layer or overpressure from causing crack expansion in the roof. Shotcrete must achieve a balance between fluidity and bond strength. Slump should be negatively correlated with water velocity to prevent slurry erosion and positively correlated with crack development to ensure slurry penetration into microcracks. If the diffusion radius is insufficient, the water-reducing agent dosage should be increased or the water-cement ratio should be reduced.

[0063] The above-mentioned instant support is carried out by controlling the setting time of the concrete slurry and matching the displacement of the top plate. Specifically, the setting time is controlled to match the displacement of the top plate. When the displacement rate of the top plate is greater than 3mm / h, an accelerator is added to shorten the initial setting time. When the displacement is stable, a retarder is added to extend the initial setting time to ensure that the slurry fully fills the cracks. If the displacement of the top plate continues to increase, a compensation layer needs to be sprayed.

[0064] Underwater mining robots use high-pressure spraying of concrete slurry to form a bonding layer on the roof of the mine. Its core function is to overcome the constraints of the submerged environment on traditional support and achieve active strengthening of the roof stability: the bonding layer uses high-pressure penetration to displace the water film attached to the rock-water interface, forming a dense barrier to block the contact between water and rock, and inhibiting the softening effect of water immersion; at the same time, the slurry penetrates into cracks ≥0.2mm, filling the original and mining-induced cracks to form a network shear structure, diffusing the local roof stress into a composite bearing body, and turning the "load source" into a "bearing structure."

[0065] Thickeners such as cellulose ether can be used in concrete to improve the scouring resistance of the slurry and maintain a stable shape in a low flow rate environment; and alkali-free quick-setting agents can be added to overcome the delay of coagulation caused by the water medium and achieve immediate support.

[0066] In this way, the multi-step process of traditional support, namely "drilling → anchoring → hanging mesh → spraying", is simplified to a single-step spraying process, which shortens the support time by more than 60%, realizes the continuous mining line operation of "mining and supporting at the same time", and provides a safe working environment for underwater mining robots.

[0067] Step 5: Slurrying the Ore: After the jet cuts the ore layer, the resulting ore is crushed. This is collected and pumped by the underwater mining robot's mining head 1, where it undergoes a primary crushing process to form a slurry. The robot's internal screening mechanism then filters the ore based on particle size. Small ore passes through the screening mesh 3 and directly enters the conveying pipeline. Larger ore, filtered by the screening mesh 3, flows through the crushing mechanism 4 for secondary crushing before flowing to the conveying pipeline. This ore-crushing process converts the solid resource into a slurry for extraction.

[0068] Step 6: Water-gas mixing and lifting, and screening: The slurry of ore enters the water-gas mixing and lifting system through the conveying pipeline, flows toward the wellhead through the suction action of the centrifugal pump 24 of the water-gas mixing and lifting system, and flows to the resource washing and separation system 21 through the wellhead. The resource washing and separation system 21 uses multi-stage physical or chemical sorting technology to accurately separate and purify the slurry of ore transported to the ground by the water-gas mixing and lifting system.

[0069] In this step, the water-gas mixture lift process responds to changes in ore particle size, solid concentration, and pipeline flow in real time, dynamically adjusting the water-gas ratio to optimize gas lift efficiency and transportation stability, ensuring that the ore particles are evenly suspended in the closed pipeline and efficiently transported to the surface washing process. When the ore particle size increases or is unevenly distributed, the gas flux is automatically increased, and the turbulence intensity of the gas-liquid mixed flow is increased to enhance the suspension capacity of coarse particles and avoid sedimentation and pipe blockage. Conversely, if fine particles are predominant, the gas volume is reduced and the water flow ratio is increased, using the liquid phase viscosity to inhibit fine particle agglomeration and reduce energy loss caused by gas cavitation. In addition, the solid phase concentration is monitored in real time by a density meter in the pipeline. When the concentration suddenly increases, the system adjusts the water-gas ratio to increase the volume expansion rate of the gas-liquid mixed flow and enhance the lifting force. At the same time, the injected water flow can lubricate the high-concentration slurry and reduce the friction resistance of the pipe wall. Based on the data from pressure sensors and flow meters, a gas-liquid-solid three-phase flow model in the pipeline is constructed. When pressure fluctuations greater than ±2 MPa or sudden changes in local flow velocity are detected, the system preferentially adjusts the opening area of ​​the gas distributor to optimize the bubble size distribution and suppress slug flow.

[0070] Exemplarily, the concrete slurry used in the mining method contains lightweight aggregate, whose density is lower than that of water. This allows the cementitious layer to float on the water surface, isolating the water from direct contact with the roof slab and preventing the roof slab from softening. The lightweight aggregate concrete comprises lightweight aggregate, a binder (cement), water, and admixtures. It has a density of 800-1000 kg / m³ (dry apparent density), a compressive strength of 25-50 MPa, a tensile strength of 3-10 MPa, an elastic modulus of 50-70% of that of the same strength grade, freeze-thaw resistance of F300, and impermeability of P12.

[0071] Although the concrete paste used in this method has a slightly lower tensile strength than ordinary concrete, the density of lightweight aggregate concrete is lower than that of ordinary concrete, and it also has better durability and deformation capacity. The surface of the aggregate is coated with cement slurry to form a closed structure, which reduces water absorption and maintains buoyancy stability. After the shotcrete operation, a buoyancy layer is formed on the water surface. The cement slurry forms a dense layer on the roof, blocking water penetration and preventing the softening of the roof rock layer; the thermal expansion coefficient is 20% lower than that of ordinary concrete, reducing cracking of the bonding layer caused by high temperature and high stress at depth; sulphoaluminate cement is used in underwater construction to shorten the initial setting time to within 30 minutes, reducing the impact of water scouring. Lightweight aggregate concrete achieves the dual functions of underwater buoyancy and roof bonding through the synergistic effect of low-density aggregate and cementitious materials. Its core advantage lies in the combination of lightweight materials and interface strengthening. It not only solves the problem of excessive deadweight of traditional concrete, but also ensures underwater stability through closed pores and anti-floating technology, providing an innovative solution for preventing roof softening.

[0072] For example, an underwater mining robot uses a high-pressure jet to cut the ore layer to produce a crushed ore body. Its collection device uses a mining head to crush large pieces of ore and suck water, and collects the fluid mixture of solid resources through a collection pipe; small-volume ore bodies can directly enter the conveying pipeline through a screening net, and large-volume ore bodies are filtered by the screening net and flow through a crushing mechanism to be crushed and then flow to the conveying pipeline. In this application, the underwater mining robot integrates the functions of high-pressure jet rock breaking, ore body collection and transportation. It sprays high-pressure water through a jet nozzle to crush the ore layer, and then the mining head and collection pipe collect the crushed ore body to realize the slurrying of the ore body. By utilizing the high-energy rock-breaking effect of the water jet, combined with the ore body collection and transportation device, efficient crushing and slurrying of the ore body are achieved, the crushing efficiency of the ore body is improved, the ore body collection and transportation process is simplified, and the energy consumption and cost of the mining operation are reduced.

[0073] For example, the water-gas ratio is dynamically adjusted during the water-gas mixing lifting process to optimize gas lift efficiency and conveying stability, ensuring uniform suspension of ore particles in the closed pipeline and efficient transportation to the surface washing stage. Specifically, the water-gas ratio is dynamically adjusted based on changes in ore particle size and concentration. Under high-pressure submersion, the water-gas mixing lifting system dynamically adjusts the water-gas mixing ratio to accommodate varying ore particle size and concentration, effectively overcoming the challenges of traditional mechanical conveying, including high wear, high energy consumption, and clogging. If coupled with an intelligent control system that optimizes gas lift efficiency and conveying stability in real time, this can ensure uniform suspension of ore particles in the closed pipeline and efficient transportation to the surface washing stage, balancing the continuity, safety, and economic requirements of mining operations under complex geological conditions. After the underwater mining robot breaks rock with a jet, the crushed ore flows toward the wellhead through the suction action of the water-gas mixing lifting system's centrifugal pump. This method overcomes the challenges of traditional mechanical conveying, including high wear, high energy consumption, and clogging, and improves the efficiency and stability of ore transportation.

[0074] For example, the resource washing and separation system is characterized by the precise separation and purification of the slurry of ore transported to the ground by the water-gas mixing lifting system through multi-stage physical or chemical sorting technology, and the dynamic control of sorting conditions by parameters such as density difference, particle size distribution or mineral surface characteristics, so as to efficiently strip impurities and associated minerals from the ore, and achieve high-purity enrichment of target resources and simultaneous recovery of multiple categories. If the system is further combined with the mineral component data fed back by intelligent sensing, and the operating parameters of the sorting equipment are adaptively adjusted, and the process chain coupling such as hydrocyclone, flotation, magnetic separation or chemical leaching is carried out, it will not only ensure the maximization of resource recovery rate, but also carry out environmentally friendly treatment and recycling of waste slag and wastewater generated during the mining process, and ultimately form a concentrate product that meets industrial standards, while supporting the greening and closed-loop management of resource utilization throughout the entire resource mining process.

[0075] For example, an intelligent sensing and control system can be configured to collect real-time underground environmental parameters, equipment operating status, and resource processing flow data through a multi-dimensional sensor network. This system can deeply integrate multi-source information such as water pressure, temperature, ore slurrying process, gas-liquid mixture ratio, and support structure stress, and construct a dynamic digital model to achieve transparent monitoring of the entire process. The wellhead booster pump provides high pressure to the wellbore, adjusting the appropriate operating pressure. The underground operating pressure is greater than the rock closure pressure and less than the rock fracture initiation pressure, keeping the roof in a stable pressure state. Under the action of the appropriate pressure gradient and the shotcrete of the underwater mining robot's grouting support system, the rock roof is guaranteed to be strong and stable during operations, preventing rock softening caused by the submerged environment and rock loosening caused by mining pressure relief.

[0076] The in-situ mining method for deep mineral layers in a submerged environment proposed in this application is to drill a large-diameter vertical shaft to the target mineral layer and cement the well, seal the wellhead, pressurize it, and inject water into the wellbore to create a submerged environment. Then, an underwater mining robot is used to convert the ore into a slurry in situ in the submerged environment and simultaneously implement roof support as needed. The ore is then lifted to the surface by a water-gas mixing lifting system, and then the resources are finely classified and purified through a resource washing and separation system. Compared with traditional mining methods, this application can significantly reduce the environmental impact of the mining process, reduce safety hazards such as dust and harmful gases, improve resource recovery rate and purity, and achieve environmentally friendly and efficient deep mineral layer mining, with significant economic and environmental benefits.

Claims

1. A method for in-situ mining of deep mineral strata in a flooded environment, characterized in that: By injecting water into the wellbore to create a flooded environment at the deep mineral layer, underwater mining robots are used for mining operations, and deep resources are converted into slurry for centralized mining, including the following steps: (1) Drilling: Drilling to form large-diameter vertical and horizontal wells that match the depth of the target ore layer, and cementing the wells to ensure that the roof height of the horizontal wells is compatible with the height of the underwater mining robot, lowering the underwater mining robot and connecting it to the water and gas lifting system; (2) Pressurization to create a high-pressure environment: After pressurizing the wellbore, the wellhead is sealed to provide a high-pressure environment inside the wellbore. The pressure range is greater than the rock closing pressure but less than the rock cracking pressure, so that the top plate of the ore layer is in a stable pressure state and the well is sealed, forming a suitable pressure gradient to facilitate the mining operation of the underwater mining robot; the rock closing pressure P c It is 1.2~1.5 times the pressure gradient of the overlying rock layer, and the rock fracture pressure P f Determined by the formation fracture pressure gradient, ranging from 15 to 25 kPa / m; (3) Water injection to create a submerged environment: Connect the screening system outside the wellhead with the underground water and gas lifting system, and inject water into the annulus of the casing through the high-pressure water injection valve under the condition that the wellhead is completely sealed until a submerged environment is formed. The water level in the horizontal well section is close to the top of the ore layer to simulate suitable mining conditions. During the water injection process, the upper limit of the water injection pressure is controlled not to exceed the rock fracture pressure, and the lower limit is higher than the rock closure pressure. The flow rate of the water injection pump is automatically adjusted according to the pressure change rate. (4) Mining and support: Underwater mining robots carry out mining and use water jets to crush the ore body. After mining, support is carried out in places where support is needed based on the monitored dynamic response of the surrounding rock. The underwater mining robot sprays the pre-stored concrete slurry at high pressure onto the roof of the ore layer to form a cementing layer as mining support in a submerged environment. When supporting, by controlling the setting time of the concrete slurry and matching the displacement of the roof, immediate support is carried out to achieve continuous mining line operation. The high-pressure water for water jet rock breaking is extracted from the submerged environment through a water injection pipeline. (5) Slurry ore body: The jet-mined ore body is collected and sucked by the underwater mining robot, and is crushed into a slurry ore body. The internal screening mechanism of the underwater mining robot screens and filters the ore body according to the particle size. The small-volume ore body enters the conveying pipeline directly through the screening net for fluid transportation. The large-volume ore body is screened and filtered, and then crushed again by the crushing mechanism before entering the conveying pipeline; (6) Water-gas mixing and lifting, screening: The slurry ore body enters the water-gas mixing and lifting system through the conveying pipeline, is sucked to the wellhead under high pressure conditions, and is washed and separated by the screening system to achieve the recovery of high-purity resources.

2. The mining method according to claim 1, characterized in that: The depth of the deep ore layer is 1500~2000 meters. In step (2), the pressure parameter setting gradient is controlled between 18~25 kPa / m and close to the lower limit to prioritize the stability of the roof.

3. The mining method according to claim 1, characterized in that: During pressurization, the stress response of the wellbore surrounding rock is monitored in real time. According to the rock deformation trend captured by the sensor, the injection pressure parameters are automatically adjusted to ensure that the pressure fluctuation range is always within the safety window between the rock closure pressure and the rock fracture initiation pressure.

4. The mining method according to any one of claims 1 to 3, characterized in that: During the mining process of step (4), the jet pressure and flow rate are dynamically matched according to the characteristics of the coal rock. The jet morphology and nozzle status are monitored in real time by microseismic sensors to monitor the hardness and crack density, monitor the coal rock mining volume and particle size distribution, and provide feedback to adjust the jet parameters.

5. The mining method according to any one of claims 1 to 3, characterized in that: The concrete slurry in step (4) uses lightweight aggregate concrete, which has a density less than that of water and forms a buoyancy layer underwater; the lightweight aggregate concrete has a dry apparent density of 800-1000 kg / m³, a compressive strength of 25-50 MPa, a tensile strength of 3-10 MPa, an elastic modulus of 50-70% of the same strength grade, a freeze-thaw resistance of F300 grade, and a permeability of P12 grade.

6. The mining method according to any one of claims 1 to 3, characterized in that: During the water-gas mixing and lifting process in step (7), the water-gas ratio is dynamically adjusted according to the changes in ore particle size, solid concentration and pipeline flow state to ensure that the ore particles are evenly suspended in the closed pipeline and efficiently transported to the screening system.

7. A system for in-situ mining of deep mineral strata in a submerged environment for implementing the mining method according to any one of claims 1 to 6, characterized in that: Including deep mine flooding environment construction system, underwater mining robot, water-gas mixing lifting system, resource washing and separation system; The deep mineral seam flooding environment construction system is used to construct a flooding environment at a deep mineral seam location by drilling, pressurizing and injecting water into the wellbore; The underwater mining robot is used to carry out mining operations and provide support in a submerged environment of a deep ore layer, to break the target ore layer with high-pressure water jets, to collect the ore body and to convert it into a slurry ore body in situ; The water-gas mixing and lifting system is connected to the underwater mining robot and the resource washing and separation system, and the slurry ore body is lifted by water-gas mixing and pumped to the wellhead under high pressure conditions; The resource washing and separation system is arranged at the wellhead, and is used to separate and purify the slurry ore body transported by the water-gas mixing lifting device system, so as to realize the recovery of high-purity resources.

8. The submerged jet solid resource in-situ slurry mining and transportation system according to claim 7, characterized in that: The deep mineral layer flooding environment construction system includes a drilling device, a wellhead pressurizing device and a water injection device; The drilling device is used to drill large-diameter vertical wells and horizontal wells that match the depth of the target ore layer, and to cement the wells to ensure that the roof height of the horizontal wells is compatible with the height of the underwater mining robot; The wellhead pressurizing device is used to pressurize the wellbore and seal the wellhead, providing a high-pressure environment inside the wellbore. The pressure range is greater than the rock closing pressure but less than the rock fracture pressure, so that the roof is in a stable pressure state, and the well is sealed, forming a suitable pressure gradient to facilitate the mining operation of the underwater mining robot; The water injection device is used to inject water into the annulus of the casing of the wellbore until the water level in the horizontal well section is close to the top of the ore layer, forming a flooded environment to simulate suitable mining conditions.

9. The submerged jet solid resource in-situ slurry mining and transportation system according to claim 6, characterized in that: The underwater mining robot includes a jet rock breaking mechanism, a grouting mechanism, a mining and transportation mechanism, and a migration mechanism installed on the body; The grouting mechanism includes a slurry bin, a pressure pump, a grouting pipeline and a grouting nozzle connected in sequence; The concrete slurry is sucked from the slurry bin and pressurized by the pressure pump, and then sprayed through the grouting pipe and the grouting nozzle to the roof of the mine to carry out support operations; The jet rock breaking mechanism includes a jet nozzle, a pressure pump, a water injection pipeline and a water pump; the jet rock breaking mechanism sucks the water from the flooded environment through the water pump and pressurizes it through the pressure pump to form high-pressure water, which is then transported to the jet nozzle through the water injection pipeline to crush the ore body through the jet; The mining and transportation mechanism includes a connected mining head, a collection pipe, a screening net, a crushing mechanism, and a conveying pipeline. The mining head is responsible for collecting the ore body after jet crushing. After the large ore blocks are crushed once, they are transported to the screening net through the collection pipe. The ore body flows into two branches. Small-volume ore bodies are directly transported through the conveying pipeline, while large-volume ore bodies are crushed twice by the crushing mechanism and then transported through the conveying pipeline. The migration mechanism provides power to the underwater mining robot.

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