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.

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.

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.

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.

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.

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.

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 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.

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.

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.