Acidic wastewater generated by in-situ leaching uranium poses a serious threat to the groundwater environment. Aiming at the problems of long microbial remediation cycle, low survival rate and insufficient stability of electrokinetic remediation, a remediation method of microelectric field-coupled sulfate-reducing bacteria (SRB) was proposed. Through simulated wastewater remediation experiments, a three-chamber electrochemical device was constructed to explore the remediation mechanism and optimize the key parameters by combining the electromigration effect with the reduction function of SRB. The results show that the coupled remediation system significantly enhanced the uranium (VI) removal rate (more than 98%), and effectively reduced the concentrations of Ca, Mg, Al, Fe and other metal ions (removal rate>80%) and sulfate content (removal rate > 90%). Under the influence of an electric field, uranyl ions migrate to the cathode region, where they are predominantly reduced by S^2- generated through the metabolic activity of sulfate-reducing bacteria (SRB) and subsequently co-precipitated. A minor fraction is reduced to U(IV) via electrode reactions. Experiments show that the different potential gradients can lead to different pH in the cathode chamber, which affects the remediation effect, with H⁺ leading to the escape of S^2- under acidic conditions (pH<4) and the formation of soluble uranium complexes easily under alkaline conditions (pH>9); with a potential gradient of 0.2~0.4 V/cm, the balancing remediation efficiency, microbial activity and energy economy. This study provides a theoretical basis and technical support for the green and efficient remediation of acidic wastewater from uranium extraction by in-situ leaching technology.

Low-permeability sandstone uranium mine, with its poor permeability and high injection difficulty, has brought great challenges to the traditional in-situ leaching mining technology. In view of the current low permeability uranium mining problems, this paper discussed the innovative application of high-pressure liquid injection technology in the field of in-situ leaching mining and its effectiveness. Comparative tests were conducted to verify the effectiveness of high-pressure liquid injection technology, pumping liquid volume test and tracer test were carried out under atmospheric pressure and high-pressure conditions respectively. The test results show that compared with the atmospheric pressure condition, the high-pressure liquid injection technology increases the injection flow by 6.4 times, the pumping flow by 1.05 times and the seepage velocity by 33 times. High-pressure liquid injection technology can effectively solve the leachants injection problem in low-permeability sandstone uranium mine, and the technology is convenient to implement in the mine site.

The ore subjected to radioactive sorting treatment is crushed ore, with random shapes, which directly affects the accuracy of ore grade detection. To enhance the accuracy of radioactive separation detection, standard samples of uranium ore were prepared to conduct an influence test on how the shape of uranium ore affects detection efficiency. The relationship between the ore shape factor and the variation coefficient of detection efficiency was examined, leading to the establishment of a detection efficiency correction algorithm based on ore shape. Additionally, a quantification method for ore shape suitable for uranium ore radioactivity detection was proposed. The validity of the proposed detection efficiency correction algorithm has been verified through practical ore sorting tests. After implementing this algorithm, the error in uranium ore grade detection was reduced to less than 5% in over 70% of the test groups. This significantly mitigates the impact of ore shape on detection efficiency and enhances the accuracy of uranium ore grade detection.

With the development of uranium mining, uranium mining technology has rapidly advanced, but various challenges have emerged. In the process of in-situ leaching of uranium, there is often a phenomenon of decreased pumping and injection volume, which seriously affects the efficiency of uranium leaching. In response to the problem of decreased pumping and injection volume, physical, chemical, and combined well cleaning techniques have been carried out. The washing technology can solve the blockage around the wells, but its washing effect lasts for a short time and has a small impact radius, which cannot fundamentally solve the problem of decreased flow rate. The liquid flow cavitation technology is widely used in petroleum extraction, which can effectively increase the production of pumping wells and reduce the pressure of injection wells. However, it has not been involved in the in-situ of uranium process. In this paper, by comparing the difference between uranium leaching technology and petroleum technology, the cavitation device is optimized, and the drilling wellhead device is improved in the ground test, and then the liquid flow cavitation test is carried out. During the test, the operation displacement reached 2 m³/min and the pressure was about 21 MPa, which verified the feasibility of liquid flow cavitation technology in in-situ of uranium, and provided a new idea for improving the permeability of uranium mine.

Due to the change in ore properties of a certain hard rock uranium mine with the increase of mining depth, the heap leaching process of the ore encountered the problem of heap scaling. In order to solve the problem, the effects of leaching agent acidity, spray intensity, column height and particle size on heap scaling were studied. The results show that when the acidity of the leaching agent is 50.0 g/L, the spray intensity is 40.0 L/(m²·h), and the leaching period is 30 days, there is no scaling in the column leaching test, and the uranium leaching rate of -10 mm ore reaches 83.40%. The results of the 800 t ore pilot test confirms that there is no scaling in the heap with high acidity and large spray intensity, and the uranium leaching rate reaches 86.57%.

The kinetics of thorium extraction from hydrochloric acid medium by a binary mixed system of di(2-ethylhexyl) (2-ethylhexyl)aminomethylphosphonate (Cextrant 230) and trialkylphosphine oxide (Cyanex 923) was investigated using the laminar flow constant interfacial cell method. For comparison, the kinetics of thorium extraction by the Cextrant 230 single system was also studied. Systematic investigations were conducted on the effects of stirring rate, temperature, specific interfacial area, extractant concentration, acidity, and chloride ion concentration on the extraction rate.The results show that the extraction regime is deduced to be chemical reaction-controlled for the sole Cextrant 230 system and diffusion-controlled for the mixture system, respectively, and the extraction reaction occurring at the bulk phase would be the rate-determining step. The thorium extraction rate is barely affected with temperature variations in the sole Cextrant 230 system, but increased in the mixture system, with an activation energy of 14.74 kJ/mol. The concentration of chloride and extractants linearly related to the extraction rate indicates that the extraction of Th⁴⁺ both in the sole Cextrant 230 system and mixture system is a pseudo first-order reversible reaction.

Taking the stone coal vanadium ore in Danfeng country, Shangluo city, Shannxi province as the research object, the vanadium leaching characteristics were studied using direct acid leaching and sulphuric acid-curing leaching process, respectively. The results indicate that the optimum vanadium leaching rate is 86.7% when using direct acid leaching process under conditions of sample fineness of 45%, H₂SO₄ concentration of 14%, leaching period of 6 h, leaching temperature of 80 ℃, Ca(ClO)₂ dosages of 3%, CaF₂ dosages of 2%, and the solid-liquid ratio of 1∶2. While the vanadium leaching rate can reach to 93.5% at ambient temperature by using sulphuric acid-curing leaching process under the conditions of sample fineness of 80%, H₂SO₄ dosages of 20%, wetting water dosages of 7.5%, curing temperature of 110 ℃, interval time of 10 h,water leaching period of 120 min, solid-liquid ratio of 1∶2. The results for sulphuric acid-curing leaching process is better than that for direct acid leaching process, and the conclusion can provide technical support for vanadium extraction from stone coal in Shannan region.

The core equipment of the stable rotation method for separating ⁷⁶Ge isotopes is the stable rotation machine. The normal and stable operation of the stable rotation machine is a key element to ensure the smooth progress of the entire production process. The main indicator for measuring the normal operation of the stable rotation machine is whether the speed of the stable rotation machine per minute is within a reasonable range, which is monitored by the stabilizer speed measurement system. Since the official launch of the speed measurement system, its performance in monitoring the speed and friction power consumption of the stable rotation machine has been outstanding. However, there is a drawback that when the system detects abnormal speed data of the stable rotation machine, it fails to automatically trigger the program to protect the stabilizing machine. In response to this deficiency, this article elaborates on the various functions of the speed measurement system, delves into the problem of the speed measurement system being unable to automatically execute protection programs when monitoring abnormal situations in the stable rotation machine, realizes the data communication docking between the speed measurement system and the DCS system based on MODBUS/TCP protocol, and completes the corresponding configuration programming work in the DCS system. After using the improved rotating speed measurement system, once the system detects fault protection signals such as single unit out of step/group out of step, single unit damage/group damage in the stabilizing machine, these signals will be transmitted in real time to the DCS control system. The DCS system immediately issues an accident alarm and activates the protection interlock program, successfully solving the problem of the speed measurement system being unable to protect the stabilizing machine in abnormal situations, effectively preventing damage to the stable rotation machine, and improving the safety performance of the system.

Alkaline materials were used to neutralize acidic waste residue. Open and closed experimental environments were set up with different dosing ratios and pH conditions.By monitoring the changes in pH, U, and $\mathrm{HCO}_{3}^{-}$ in the supernatant of the neutralization residue, and analyzing the mineral composition of the neutralization residue using XRD, the effect of CO₂ on U stability during the neutralization process of acidic waste residue was studied. The results show that CO₂ in the surrounding air during neutralization treatment affects the stability of pH and U in the neutralization residue. The fixation of CO₂ by the neutralization residue under alkaline conditions is an acidification process. As the pH of the neutralization residue decreases, the CO₂ fixed in the air transforms into $\mathrm{HCO}_{3}^{-}$, which gradually accumulates and causes the already stabilized U in the neutralization residue is leached out again. The pH adjustment experiment shows that there is no significant correlation between U and pH. The pH range for U leaching is 7.68~8.41, and $\mathrm{HCO}_{3}^{-}$ accumulates significantly in this range. There is a positive correlation between U and $\mathrm{HCO}_{3}^{-}$, with a correlation coefficient of 0.95. The production of $\mathrm{HCO}_{3}^{-}$ is a key factor affecting the stability of U in neutralization residue. When Ca(OH)₂ is added excessively, secondary mineral CaCO₃ will be generated in the neutralization residue. As CO₂ is fixed, the pH of the neutralization residue decreases, and CaCO₃ will partially dissolve and transform into $\mathrm{HCO}_{3}^{-}$. In the open experimental environment, only the 2.5% Ca(OH)₂ experimental group and the 2.5% Mg(OH)₂ experimental group maintain extremely low U leaching levels. After neutralization treatment, the pH of the neutralization residue is low, and very little CO₂ is fixed in the air. $\mathrm{HCO}_{3}^{-}$ which affects U stabilityis hardly produced.

The casing for in-situ leaching uranium needs to take into account the anti-corrosion performance and pressure resistance. In view of the complex geological conditions of dense sandstone uranium deposits, the performance of casing made of three materials, namely unplasticized polyvinyl chloride(UPVC), carbon steel and glass fiber reinforced plastic(GFRP), had been comparatively investigated. The results show that UPVC casing has good corrosion resistance but poor pressure resistance; carbon steel casing has good pressure resistance but is easy to corrode and has high cost; GFRP casing is excellent in corrosion resistance, pressure resistance and tensile strength. In terms of cementing quality, the cementing strength of GFRP casing, carbon steel casing and UPVC casing with cement is 1.80, 2.91 and 0.32 MPa respectively, and the cementing strength of GFRP casing with cement shows obvious advantages. GFRP casing is the best choice for in-situ leaching uranium in dense sandstone uranium deposits, which can meet the requirements of anti-corrosion performance and pressure resistance, and can guarantee the quality and service life of the drilling.

During the production of nuclear fuel elements, hydrofluoric acid solutions with high concentration of uranium are generated. According to the requirements of the National Nuclear Safety Administration (Guoheanfa 〔2023〕 No. 158), hydrofluoric acid solutions with uranium concentrations below 0.2 mg/L can be released from regulatory control. To meet national regulatory requirements, this study utilized a hydrofluoric acid-resistant resin functionalized with specific groups to investigate its uranium adsorption performance in uranium-containing hydrofluoric acid under static and dynamic conditions. The resin’s resistance to hydrofluoric acid corrosion, saturated adsorption capacity, desorption efficiency, and reusability were systematically evaluated. The results show that the uranium concentration in hydrofluoric acid treated with this resin is reduced to below 0.2 mg/L, meeting the regulatory release criteria. Furthermore, the resin exhibits no significant decline in uranium adsorption capacity after 10 adsorption-desorption cycles. These findings provide a foundation for subsequent large-scale engineering applications.

The domestic and international situation of digital mine was introduced. Aiming at the problem of information island, taking an in-situ leaching uranium mine in Inner Mongolia as the research object, following the digital uranium mine architecture of CNUC, the digital integrated management and control platform was designed. By analyzing the technical architecture of systems of the mine, the data interface program was researched and developed independently, which is compatible with WebService, OPC and IEC104 standards. Using the data interface program, the values in the database of OA, DCS and electric power system were got and centralized managed. By the digital integrated management and control platform, the digitalization level of in-situ leaching uranium mine was greatly improved.

A regional mining transportation system optimization model based on complex network planning was constructed to address the characteristics of dispersed mining of uranium deposits, diverse development methods, and complex transportation system networks in the region. Under the conditions of regional mining, a comprehensive planning and development transportation system was developed to enhance the efficiency, economy, and scientific effectiveness of the regional mining transportation system. By analyzing the spatial and geographical relationships of regional mines and the concept of intensive development, a system network diagram was established. Using network flow theory and Grey Wolf Algorithm, the global optimal solution for the regional mining transportation system was obtained. The effectiveness of the model was validated in the Xiangshan uranium mining area, and the optimal regional transportation route and lowest cost plan for the mine were calculated. The results indicate that the model meets the requirements of large-scale and intensive regional mining transportation systems, and has effective planning effects on transportation systems. It provides technical support for the economic and efficient operation of the transportation system in the Xiangshan uranium mining field, and can also provide reference for the intelligent transportation system planning of other uranium mining bases.

According to the national policy of developing green mining and building green mines as an important platforms and means for transforming the development mode of mining, enhancing the overall image of the mining industry, and promoting the safe and sustainable development of the mining industry, as well as the requirements of the State Security Bureau to carry out the "mechanization replaces people, automation reduces people" science and technology strengthen safety special action, the company has completed the "mechanization" transformation and has continued to carry out intelligent mine construction. Based on the pain points of safety in mining, such as high labor intensity, poor working environment, and high safety risks, the company has carried out intelligent mine construction projects, including unmanned driving of electric vehicles, remote control of loaders, remote control of crushers, and automation of ventilation and drainage. Through the transformation and upgrading of "digitalization" and "intelligentization", the company gradually achieves "minimization of personnel" or "unmanned operation" underground, improving the working environment and reducing labor intensity while further enhancing the intrinsic safety of hard rock uranium mining.

The data of mineral resources reserves is the focus of the management of mineral resources reserves, and the national survey of mineral resources is a national and basic survey of mineral resources. Based on the national survey database of mineral resources in Henan Province, it is necessary to study and put forward a method to quickly update the resource reserve data in the mineral resources reserve database to facilitate the efficient use of the mineral resources management department, which is necessary to solve many problems such as data missing, error, redundancy and low timeliness in the reserve database and to better manage the mineral resources. By designing a computer program algorithm, the resource reserve data records in the national survey database of mineral resources and the mineral resource reserve database were automatically compared according to the relevant fields, and the differences were found. According to the differences, different program codes were adopted to update the resource reserve data in the reserve database. Compared with the method of manually updating data in daily reserves management, this method can update the resources and reserves data in the mineral resources and reserves database more comprehensively, quickly, efficiently and accurately.

In-situ leaching uranium has become one of the important techniques in uranium mining and metallurgy of China after more than 40 years of experimental research and industrial application. However, the radioactive wastewater, radioactive waste gas and radioactive solid wastewater produced by long-term in-situ leaching uranium will have impact of different extent on the ecological environment around the mine, which pose adverse effect on public health and environmental safety. In order to understand the radiation environment of in-situ leaching uranium mine, taking an in-situ leaching uranium mine in Xinjiang as the investigation object, radiation environment investigation and research during production and operation period of mine were carried out on the basis of the site investigation and sample analysis. The results show that the radioactivity levels of monitoring media such as ambient air, terrestrial gamma, surface water, groundwater, soil, biological samples, and radon exhalation rate around the in-situ leaching uranium mine are basically within the radioactive background level range of Xinjiang region or the applied standard limits, besides the radiation environmental quality meet the corresponding requirements and the radiation environmental risk is controllable. In the future production and operation period of in-situ leaching mine, mining enterprises should strengthen the awareness of environmental protection, through establishing and improving environmental management and monitoring plans, formulating scientific and effective radiation protection measures, strengthening environmental monitoring and emergency management and other measures to ensure the impact of mining activities on the environment is minimized, public health and environmental safety is guaranteed and development of in-situ leaching uranium mining is further improved.

The well washing process is an important way to increase the well water volume and increase the production capacity in the in-situ leaching uranium mine, but with the continuous improvement of safety and environmental protection requirements, the traditional well washing method alone can no longer meet the needs in recent years. A local leaching uranium mine has further improved the safety and environmental protection of the well washing process and the efficiency of the well washing process by carrying out the optimization and improvement of the safety and environmental protection of the well washing process such as the parallel well washing technology of the air compressor, the improvement of the acid adding method, and the recycling technology of the well washing wastewater, so as to maximize the effect of well washing, and ensure that the safety and environmental protection risks of the well washing process of the in-situ leaching uranium mine are controlled.

With the global growth in demand for clean energy, the development of uranium ore resources and its environmental impact increasingly have raised concerns. Uranium tailings (slag), as the main by-product of uranium mining and processing, are an urgent environmental concern requiring safe disposal. This study systematically summarized the research progress of uranium tailings backfilling and safe disposal technology, and focuses on the paste filling process optimization and nano material solidification mechanism, in order to provide theoretical support for the green development of uranium resources and the safe disposal of radioactive waste.

In order to cope with the rising cost of truck haulage due to the rising price of diesel fuel, this thesis focuses on the existing trolley line in the Husab uranium mine in Namibia, the “Field two-time refueling method” was designed to measure the oil consumption and power consumption on the slope under the condition of pure oil and the auxiliary condition of trolley line. By disassembling the cost and benefit factors related to the operation of trolley line, this thesis put forward the reasonable value method of each factor, constructed the economic analysis frame and completed the economic feasibility calculation of the operation of trolley line. The results show that the truck with 330 t rated load in Husab is driven up the slope by trolley line at a speed of 550 m, consumes 62.65 kW·h of electricity, saves 11.25 liters of fuel consumption than the truck with pure oil, and the climbing speed is 24 km/h, which is twice as fast as that of the truck with pure oil. According to the calculation, the total dynamic income of the test section in Husab is 70.47 million N$\$$ during its whole life, and the static payback period of the technical renovation investment is less than 2 years. The static payback period of the investment is less than 5 years considering the construction cost. The investment sensitivity analysis shows that the project is most sensitive to the oil price, followed by electricity price and operating cost, and the project is least sensitive to the capital input, but even when the oil price is reduced by 50%, the dynamic income of the whole life of the project can still reach 22.09 million N$\$$, indicating that the project has strong risk resistance.