Guyuan 460 associated uranium molybdenum resources belong to amorphous colloidal sulfur molybdenum ore, which has the characteristics of complex mineral properties, difficult beneficiation and metallurgy, and long process flow. After more than 20 years of experimental research and production practice, a process development technology system of "oxygen pressure acid leaching modified filtration extraction separation process water cycle" has been formed. This article summarizes the technological innovation process of Guyuan 460 uranium molybdenum mine, which comprehensively innovates and practices from multiple aspects such as efficient leaching of uranium molybdenum ore, solid-liquid separation of slurry, separation and purification of uranium molybdenum, product preparation, process water recycling, key equipment and material engineering applications. Finally, an oxygen pressure leaching demonstration mine with an annual processing capacity of 200 000 tons of uranium molybdenum ore was built, greatly improving the scientific and technological level of complex associated uranium molybdenum resource development in China. It is a typical embodiment of new quality productivity in the mineral field.

A sandstone-type uranium deposit in Xinjiang belongs to auspicious prospecting stage with exploration line of 200 m×200 m, low exploration degree, thin ore bed and low uranium content. In addition, there are complex hydrogeological conditions with poor permeability (permeability coefficient is only 0.045 m/d) and high pressure head. No leaching test work has been carried out in this deposit area. In order to study the leaching of uranium resources in the deposit, field leaching test was carried out by adopting neutral leaching and improving the pressure leaching technology, the results show that the average extraction volume of single hole is 1.7 m³/h, the average mass concentration of uranium in leaching solution is 40.37 mg/L, the maximum mass concentration of uranium in single hole is 390.22 mg/L, and the annual leaching recovery is 13.39%, it provides technical support for the exploitation of uranium resources in the deposit.

The "CO₂+O₂" leaching process is an artificially intensified water-rock interaction process that leads to the dissolution of non-uranium minerals, which enter the leaching solution system and cause changes in the dissolution and precipitation state of the minerals in the leachate. Geochemical simulation methods were used to simulate ion species in the leachate and the mineral leaching equilibrium studying the dissolution, migration, and precipitation of minerals during the in-situ leaching mining process. For the first time, the conditions and influencing factors for the precipitation of manganese minerals were studied, targeting the characteristics of strong groundwater reducibility and high carbonate content in the target deposit.The results show that under neutral leaching conditions, uranium in the leachate mainly exists in the form of UO₂(CO₃${)}_{3}^{4-}$ followed by UO₂(CO₃${)}_{2}^{2-}$, and the proportions of the two are affected by pH. The saturation indices of carbonate minerals in the neutral leaching leachate of the study area are all greater than zero, indicating a supersaturated state, and pH is the main factor controlling the precipitation of carbonates, with the critical pH for calcium carbonate precipitation being 6.7 and for calcium magnesium carbonate precipitation being 6.5. The saturation indices of sulfate minerals are all less than zero, and no precipitation of calcium sulfate will occur in the formation, and the precipitation of calcium sulfate is mainly controlled by the content of calcium ions and sulfate ions. Under neutral leaching conditions, iron mineral precipitation is likely to occur and is greatly affected by pH conditions; at the same time, manganese-containing minerals will precipitate in the leachate, and the redox conditions are the main factors affecting their dissolution and precipitation; some silicon-containing minerals in the leachate are in a supersaturated state, and their dissolution and precipitation are greatly affected by pH The research results are of great significance for the prevention of precipitation in in-situ leaching mining.

In order to solve the problems of microwave plasma decomposition of ¹³CF₄, such as complex operation process, harsh decomposition conditions and easy corrosion of reaction tubes,the thermal catalytic decomposition of ¹³CF₄ to produce ¹³CO₂ was studied. Under the condition of anhydrous and high temperature, ¹³CF₄ was decomposed into ¹³CO₂ by gas-solid reaction between ¹³CF₄ and solid defluorination agent, using γ-Al₂O₃ as solid defluorination agent, meanwhile, the metal oxide in the defluorination agent is converted into metal fluoride. The results show that when the flow rate of reaction gas is 120 mL/min, the loading amount of catalyst is more than 60 g, the content of O₂ in feed gas mixture is more than 50%, and the temperature of high temperature tubular furnace is 900℃, the conversion of γ-Al₂${{\mathrm{O}}_{3}}_{}$ catalyst to ¹³CF₄ gas is over 90%, which has good catalytic decomposition performance and can realize continuous catalysis and decomposition. The catalytic decomposition process has the advantages of simple process, convenient operation and very high carbon yield, and can be used in industrial production.

To investigate the adsorption characteristics of sodium dodecylbenzene sulfonate on scheelite surface, the water bath shaking method was used to study the adsorption capacity, kinetics, and thermodynamics. The effects of pH, reagent concentration, temperature on the adsorption characteristics were explored using kinetic and thermodynamic equation models. The results show that under pH=10, the adsorption capacity of sodium dodecylbenzene sulfonate on scheelite surface is the largest, while under pH=7, the adsorption rate is the fastest, which conforms to the pseudo-second-order kinetic equation. Within a certain range, the adsorption capacity of dodecyl benzene sulfonate on scheelite surface is positively correlated with the reagent concentration and temperature. The adsorption process conforms to the Freundlich equation, which is an endothermic reaction of heterogeneous multilayer adsorption.

The accuracy of hydraulic conductivity holds great significance for the subsequnce research and exploitation of the in-situ leaching sandstone-type uranium deposit. Taking the in-situ leaching technology of sandstone-type uranium deposit as the research object, based on the current research status of hydrogeological well completion technology and hydraulic conductivity calculation methods at home and abroad, this paper analyzes the influencing factors of hydrogeological well completion quality on hydraulic conductivity calculation. Through VB visual programming software, the loopholes of human error in calculation and curve drawing are made up, and the calculation of hydrogeological parameters of deposit is more concise, efficient and accurate.

With the growing global demand for nuclear energy, the evaluation of the quality of uranium resource distribution and the precise measurement of reserves have become increasingly important. The uranium fission prompt neutron logging technology, as a critical tool for uranium ore logging exploration, offers the advantage of providing quantitative results unaffected by radioactive equilibrium. However, the measurement accuracy is influenced by the pulse width and yield of the neutron source. This study utilizes a uranium logging instrument equipped with an associated particle sealed-tube neutron generator, which enables time and spatial statistics of the companion α particles emitted by the outgoing neutrons. This approach helps to eliminate interference from the source neutrons and enhances the accuracy of the logging results. In the simulation process, to obtain information on neutron emissions during logging and the timing signal responses of both the companion α detector and the epithermal neutron detector, we propose a response time simulation method that combines Monte Carlo simulation software with MATLAB. By appropriately setting the pre-delay time and gate width, a relationship curve between the count rate and uranium content in formations with uranium levels ranging from 0 to 1.00% was established. The results from validation samples indicate that the calculated uranium content show a deviation of less than 0.1% from the actual values. When the uranium content in the formation exceeds 0.5%, the relative deviation is within 10%. This method meets the exploration requirements and demonstrates significant application value for uranium ore logging.

To address the wastewater treatment issue in electrode uranium plating process, an evaporation concentration device suitable for the special requirements of this process has been developed, which can effectively reduce the discharge of radioactive process wastewater. The principle of this device is to vaporize the water in the waste liquid through micro-vacuum distillation, condense it back into liquid water, and then discharge it externally. The remaining concentrated water and solid in the evaporator are treated as radioactive solid waste. Considering the actual application scenarios, leak-proof foundation pits are set up to address equipment failure or emergency shower problems. The device uses neutralizing tanks to handle the acidity and alkalinity of the waste liquid, and is equipped with a detection port to ensure that the waste liquid after condensation meets the emission standards.

The in-situ leaching of uranium is influenced by deposit conditions, leaching environments, and various other factors, resulting in a low utilization rate for certain resources. To facilitate the rational development of these resources, a device for preparing leaching agents was designed to enhance the leaching process by increasing the concentration of sulfuric acid in areas where the resources is difficult to leach. The results show that the relative deviation in concentration remains below 1.5%, allowing for precise and stable preparation of acid either regionally or at individual boreholes. By using a 15~20 g/L sulfuric acid solution as a leaching agent, the unit uranium leaching rate of the refractory leaching uranium resources can be increased from 24.8% to 53.7%. The amount of sulfuric acid used and the increase in residual acid are only 11.1% of those used for strengthening leaching results in the entire mining area. This device achieves the leaching of the refractory leaching uranium resources with low consumption of sulfuric acid and has little impact on subsequent hydrometallurgical processes.

The design of injection and extraction fluid volume is closely related to both the effective leaching range of the lixiviant and the operational cost of the well field. To facilitate economically efficient decision-making regarding injection and extraction fluid volume in the "horizontal well-vertical well" system within the in-situ leaching uranium mining domain, a simulation-based optimization decision method for the "horizontal well-vertical well" system is proposed, leveraging multi-objective optimization algorithms. The research indicate that, compared to the initial scheme of uniformly distributing injection and extraction fluid volume, the decision scheme R2 achieves an 8.84% increase in the leaching range while reducing operational costs by 51.14%. This method has identified four "key wells" in the LK mining area, emphasizing the importance of closely monitoring the flow rates of such wells during scheme decision-making and adjustments. Based on the Pareto solution set derived from the multi-objective optimization, six combinations of injection and extraction operational schemes with varying effective leaching ranges and cost-weight ratios are selected to guide decision-makers in their scheme selection.