In order to explore the feasibility of the application of cooking waste oil in the separation of difficult floated coal slime, －0.5 mm coal particles were used as the research object, and the coal samples were wetted with different media. The settling test was carried out in the waste oil-water two-phase system, and the settling behavior of coal particles in oil, water and oil-water mixed interface was observed and recorded. The settling velocity of coal particles when reaching the oil-water mixed interface was determined by image processing software. Through the final settling results and force analysis of coal particles, the conditions for the settling and separation of coal particles in waste oil and water were clarified. The effects of ash content, particle size and wetting of different media on the settling and separation of coal particles at the oil-water interface were systematically studied. The test results show that the settling and separation results of coal particles at the oil-water interface are positively correlated with the square of coal particle size and density, and negatively correlated with the dynamic equilibrium force at the oil-water interface. The coal particles treated by water wetting show different settling states, while the coal particles treated by oil wetting and unwetting (drying) are suspended on the oil-water mixed interface. Water wetting treatment can make the surface of coal particles adhere to water, reduce the dynamic equilibrium force between coal particles and oil-water interface, and realize particle settling and effective separation. In addition, the conditions of settling separation of coal particles in waste oil-water system were further verified by replacing waste oil. The research results provide new ideas and theoretical support for the application of waste oil in the efficient separation of coal slime.

In order to further implement the People's Republic of China (PRC) Mineral Resources Law on promoting the rational development and utilization of mineral resources, under the guidance of important top-level design such as the research field of comprehensive utilization of mineral resources and the current Standard System of Natural Resources, the research on the construction of comprehensive utilization standard system of mineral resources in China was carried out using logic and system thinking. The standard system is a scientific and organic whole formed by the standards within a certain range according to their internal relations. Relying on the theory and method of natural resource standardization, under the support of the existing research results of comprehensive utilization of mineral resources, and within the framework of standardized administrative and technical logic in the field of mineral resources, the basic standardization, reserve management standardization, planning management standardization and result data management standardization of comprehensive utilization of mineral resources were carried out in a targeted manner. Following the construction principles of the standard system, China's Mineral Resources was constructed from three dimensions: foundation use, category use and subcategory use. Relying on this standard system, through the analysis and research, the problems existing in the standardization research of comprehensive utilization of mineral resources in China were put forward, and the key directions and shortcomings to be filled in the next standardization work were given to further lead the overall research work of comprehensive utilization of mineral resources in China.

With the gradual depletion of shallow resources in mines, deep mining has become an important way to obtain resources. A domestic metal mine under construction with an ultra-deep well under large-load and high-speed lifting system was taken as the research object. Simulation analysis of the aerodynamic pressure distribution laws of lifting containers was carried out by comparing the dynamic changes of air flow fields under different arrangement modes of shaft lifting containers and operating conditions. The standard k-ε turbulence model in fluid mechanics was adopted, and numerical simulations of the air flow behavior in the shaft during the operation of lifting containers were conducted using Fluent software. The aerodynamic pressure distribution around the containers during the lifting process was analyzed, and the container offset was calculated, thereby revealing the aerodynamic characteristics and lateral swinging patterns of the lifting containers in the shaft. The research results show that when two lifting containers running in opposite directions intersect in the shaft, obvious aerodynamic impact force and impact torque will be generated. Moreover, the lateral aerodynamic force of two-container in the shaft is greater than that of four-container, and the piston effect of the two-container shaft layout is more pronounced than that of the four-container shaft layout. From an aerodynamic perspective, the four-container layout should be prioritized for ultra-deep well lifting systems, with the two-container layout considered as a secondary option.

Take the high-sulfur ore in Gaofeng mine as the research object to address the problems of resource waste and potential safety hazards caused by oxidation and consolidation during the mining process of deep high-sulfur ore. The consolidation characteristics of the ore was analyzed through the weight gain method from the quantitatively perspective, and the anti-consolidation test of sulfur ore was carried out. The anti-consolidation measures of sulfur ore mining were put forward according to the test results. Based on the test results, corresponding anti-consolidation measures for high-sulfur ore mining were proposed. The test results indicate that the consolidation degree of the ore increases with time, and the pressure on the ore can promote its consolidation, and the maximum weight gain rate of the ore sample in 12 d is 0.460%. The composite anti-consolidation agent prepared by sodium bicarbonate (NaHCO₃) and hydroxyethyl cellulose (HEC) can significantly inhibit the consolidation of ore samples. When the mass ratio of NaCO₃ and NEC is 1:2 and the mass fraction of solute is 2%, the anti-consolidation coefficient is 85.5% and the weight gain rate of ore sample in 27 d is 0.215%. Combined with the test results, the anti-consolidation measures such as optimizing the blasting parameters to control the particle size of ore, continuous ore drawing in stages to shorten the exposure time and spraying anti-consolidation agent were put forward. The research results can provide theoretical basis and practical guidance for safe and efficient mining of deep high-sulfur mines.

A set of intelligent mining system solutions has been proposed to address the problems of numerous small and medium-sized mines, complex ore bodies, and difficult safety control in China's underground metal mining resources. Taking the complex and fragmented ore body of Tongkeng Mine as the research background, an intelligent system based on the concept of "spatio-temporal coordination" was constructed based on segmented airfield subsequent filling method. In this system, a global wireless positioning network was adopted to achieve unmanned and less-manned operations for key processes such as rock drilling, loading, and shovel transportation, as well as cross temporal and spatial collaborative scheduling of multi-equipment. Ore flow and equipment flow were innovatively integrated in depth. In the practical application of Tongkeng Mine, the system has run stably for one year, and has built three sets of standardized intelligent mining processes, one set of multi process and multi equipment collaborative support system, one complete intelligent equipment chain, and one scheduling platform. It has safely released resources in hidden danger areas, completed over 4 000 meters of perforation, and extracted 80 000 tons of ore, significantly improving operational efficiency and safety. The research results can provide a replicable technological path for intelligent mining of complex ore bodies, and provide a reference for promoting unmanned mining operations and intelligent equipment in mines.

There are many residual pillars and top pillars under the condition of filling body enveloping in a high-grade iron mine. In order to recover high-grade iron ore resources as much as possible, a recovery scheme of residual pillar and top pillar was studied. Comparative analysis of the technical and economic indexes between the downward drift filling mining method and the sublevel filling mining method was conducted. And the sublevel filling mining method with simple mining process, high mining intensity and low production cost was selected as the best mining method for residual pillar recovery. Based on the selected mining method, numerical simulation was used to analyze the displacement, stress, and plastic zone distribution of the surrounding rocks and filling materials in the mining area under different structural parameters of mining room. Optimization research was conducted on the structural parameters of mining room under the mining of the 606^# inter pillar and the top pillar at －525 m sublevel. The simulation calculation results show that the optimal structural parameter scheme for the mining room under the recovery of 606^# inter pillar is a mining room length of 30 m without leaving a top pillar. The maximum displacement of the mining room roof in this scheme is 50.00 mm, and the volume of plastic zone of roof is the minimum, which is 1 534.55 m³. The optimal structural parameter scheme for the mining room under the recovery of top pillar is that the spans of the first and second step mining rooms are 8 m and 10 m, respectively, and the length is 25 m. The maximum displacement of the mining room roof in this scheme is 57.64 mm, and the volume of the plastic zone per unit area of the roof is small, which is 1.02 m³. There is no obvious connection in the plastic zone of the filling body inside the mining area.

Aiming at the problem of large loss and dilution in the ore drawing process of non-pillar sublevel caving method, physical ore drawing tests under different sublevel heights and end wall inclination angles were carried out, and the variation laws of the drawn-out body shape and the variation characteristics of the ore dilution rate and the recovery rate were obtained. The results indicate that when the sublevel height is constant, with the increase of the end wall inclination angle, the horizontal thickness of the drawn-out body along the route direction increases, the axial deflection angle increases, and the width and vertical height along the end wall decrease. During the process of ore drawing, and with the increase of the sublevel height, the time of waste rock release is later, the cumulative ore dilution rate is smaller. For different sublevel heights, when the end wall inclination angle is 90°, the cumulative ore dilution rate at each sublevel height is the smallest after reaching the cut-off grade. With the increase of the end wall inclination angle, the ore recovery rate at each sublevel height increases first and then decreases, and the maximum value will be obtained when the end wall inclination angle is 85°. When the end wall inclination angle are 85°, 90° and 95°, with the increase of the sublevel height, the ore recovery decreases first and then increases, and the minimum values can be obtained at the sublevel heights of 18.8 m,19.17 m and 18.73 m, respectively.

The open stope mining with subsequent filling method is adopted in the open-pit to underground mining in Sijiaying Iron Mine, and horizontal isolation pillars are required to realize the isolation of open-pit and underground mining system to ensure the safety of underground mining. In order to improve the overall stability of the mining area, based on the gravity increase method, the effects of gravity acceleration on the distribution of stress field, displacement field and plastic zone of the open-pit bottom pillar structure system were studied when the thickness of open-pit bottom boundary pillar was 45 m and the width of panel pillar was 20 m. The results show that under the initial gravity acceleration, the pillar structure system is basically in a stable state, and with the increase of the gravity acceleration, the stress concentration phenomenon of the pillar structure system continues to increase. When the gravity acceleration increases to 2 times of the initial one, the maximum principal stress reaches 56.98 MPa. The distribution range of tensile stress also expands with the increase of gravity acceleration, and the value of tensile stress finally reaches the tensile strength of rock mass. Under the initial gravity acceleration, the maximum displacement of the pillar structure system is 259 mm and the distribution range is very small and the pillar system is in a stable state. However, the displacement increases exponentially with the gravity acceleration. The pit bottom boundary pillar and panel pillar within the range of N22 to N26 exploration lines in the mining area are high-risk areas prone to instability, which is likely to cause multiple pillar chain instability and failure. It is suggested that in the process of design and mining, measures should be taken to improve the bearing capacity of the panel pillars and the filling quality of the goaf in the range of N22 to N26 exploration lines, so as to ensure the safety and reliability of the open-pit to underground mining of Sijiaying Iron Mine.

The large blocks of ore rocks with a size exceeding 1.2 m generated during the natural caving mining method of Pulang Copper Mine have caused problems of equipment blockage and increased costs. To address these problems, the block size distribution and energy distribution characteristics of secondary crushing for three typical large ore rocks under different numbers of blast holes were analyzed in detail using finite element numerical simulation. Firstly, the block size distribution data of ore rocks were obtained through image processing and field measurement, and the ore rocks were classified. Secondly, finite element software was used to simulate the evolution of blasting stress, crack propagation, and energy dissipation. The results show that the number of blast holes has a significant effect on the crushing efficiency of large ore rocks. With the increase in the number of blast holes, the stress distribution within the rock becomes more uniform, and the crushing effect is enhanced. When the number of blast holes is the same, the three typical large ore rocks are subjected to similar blasting load pressures at the same distance from the blast holes. The blasting load pressure decays rapidly with the increase of the distance from the blast holes. During multi-hole blasting, the stress value on the central line of two-hole distribution is the maximum, while that on the central line of three-hole distribution is the minimum. With the increase in the number of blast holes, the number of cracks correspondingly increases, forming longer cracks or a more extensive crack network in the ore rock. Moreover, multi-hole blasting creates directional cracks or crack zones. After multi-hole blasting, the block size distribution characteristics of the ore rock are uniform and well-crushed. The number of blast holes is directly proportional to the maximum values of kinetic energy and internal energy. Under the condition of the same number of blast holes, the internal energy of ore rocks of various sizes remains stable, and the ratio of kinetic energy to internal energy of the rock decreases with the increase of the size of large ore rocks. Therefore, in the secondary crushing construction of rocks at Pulang Copper Mine, single-hole blasting can be used for small-sized large ore rocks, while double-hole blasting is suitable for medium-sized and large-sized large ore rocks.

Reasonable mining methods and stope structural parameters are crucial for ensuring the safety and efficient production of mines. According to the characteristics of large thickness variation of a copper ore body, combined with the analysis of rock mass joints and fissures, the evaluation of rock mass integrity, the allowable exposed area of ore rock and the self-stability ability of rock mass, the mining scheme of ore body was optimized. The stress, displacement, and failure laws within the stope mined by the upward horizontal filling mining method with reserved retaining wall were analyzed by FLAC3D numerical simulation software. The results show that the maximum tensile stress during the mining process does not exceed the tensile strength of the ore body. As the mining progresses, the maximum compressive stress migrates from the lower left tip of the goaf to the roof near the upper right tip, and as the stratification increases, the compressive stress at the tip gradually decreases. Under the condition that the exposed area is determined, the smaller the short-side span is, the greater the roof subsidence is. The mining process leads to the intensification of bottom stress and deformation, and the floor heave of the filling body floor and the surrounding rock of the footwall is significant. The shear failure is mainly concentrated at the tip of the goaf and extends to the deep part of the surrounding rock. Due to the presence of the hanging retaining wall, the sidewalls effectively block the expansion of the surrounding rock failure zone into the goaf, thereby enhancing the stability of the stope.