The research area is in the slope zone of the east Ruhuhu Basin. The sand body of Ruhuhu Basin is very thick and well developed, and possess the space condition of forming the inter layer oxidation zone. There exists the dual structure in Ruhuhu Basin. The geology survey shows the characteristics of stratum, lithology and structure, and γ gross survey targets some anomalies. By the gamma spectrometry survey and surface engineering, the W-1, W-2, W-3 and W-4 are determined as the favorable areas. The Ruhuhu Basin has a huge potentiality of formed medium and large scale sand-type uranium deposits.

Uranium (U) can be readily adsorbed and retained in plant roots. A high concentration of U causes phytotoxicity. Plants have evolved a number of defence strategies operate separately or cooperate with each other to alleviate U-induced phytotoxicity. The defense mechanisms of plants in response to uranium stress were summarized, including compartmentalization, chelation of plants, antioxidant system, chemical form conversion of uranium. The related research direction was also prospected. The results are helpful to clarify the molecular genetic basis of plant tolerance to uranium and provide reference for plant response to uranium stress.

In order to improve the cutting efficiency of deep and tight ore beds, the conventional cutting technology and screw motor composite cutting technology were studied by using the ISL wells in Bayinqinggeli deposit in the northern Ordos Basin, and the application parameters of screw motor composite cutting technology were obtained. The results show that the cutting speed of screw motor composite cutting technology is 102.8% higher than that of conventional cutting technology, and the cutting quality can meet the requirements of the ISL. The screw motor composite cutting technology has wide application prospect. According to the cutting effect in research area, it is suggested to introduce screw motor with centralizer, design a new cutting tool, and establish the corresponding casing cutting procedures to further improve the cutting quality.

Aiming at the problems of poor roadway stability and difficulty in forming in the conventional mining process of soft sandstone-type uranium deposit, the similar simulation test were carried out. The fine sand, the barite powder, the swelling soil and the 425 normal portland cement were selected as the raw materials. The similar material tests with different material ratios were carried out by the orthogonal experiment. Finally, the similar materials close to the physical and mechanical parameters of the ore rock were obtained. The similar material ratio is as follows: the mass ratio of lime to sand is 1∶8, the m(barite powder)∶m(sand) is 20%, the m(bentonite)∶m(sand) is 8%, and the particle size of fine sand is less than 2.00 mm. The key factors of similar materials such as the density, the compressive strength and the tensile strength are close to the ore rock. The error rates are controlled within 7%. The results of the similar material ratio can meet the requirements of the similar simulation test. The soft sandstone similar material obtained in this test can provide basic material for similar simulation test of the roadway excavation and support.

The cycle Ⅶ of a deposit is suitable for low sulfuric acid concentration leaching. The rapid acid consumption obtained from the ore agitation leaching test is characterized by step with the increase of acid concentration of leaching agent. The change of uranium leaching rate and mineral dissolution corresponds to acid consumption step characteristics. High acid consumption step can cause CaSO₄ precipitate. The corresponding acid concentration of each acid consumption step respectively guides the selection of acid concentration of leaching agent for acidification stage, formal leaching stage, and prevent the lower permeability of ore bed. The method of definition the acid concentration range of the liquid injection was further verified by field test.

In order to recover uranium from uranium-beryllium flotation tailings and reduce the content of beryllium in uranium products, the occurrence state of uranium and beryllium in uranium-beryllium flotation tailings was analyzed by process mineralogy, and uranium was leached by sulfuric acid leaching process. The effects of acid concentration, leaching time, leaching temperature and liquid-solid ratio on the leaching rate of uranium and beryllium were investigated, and the feasibility of recovering uranium from leaching solution was studied by anion exchange resin. The results show that the uranium in the uranium-beryllium flotation tailings is more easily leached by sulfuric acid, but the beryllium is not easily leached, the uranium can be recovered and the uranium-beryllium can be separated by ion exchange method.

The special material handling system of the uranium enrichment factory was systematicly analyzed, the characteristics of special materials were analyzed in detail, the handling lines and logistics conditions were defined, the influencing factors and practical handling methods were distinguished, and a viable overall scheme of the special material handling was obtained. The economic and intangible factors of the handling scheme were analyzed and evaluated. The SHA provides theoretical supports for improving the special material handling, and provides a logical handling scheme for the rebuilding and expanding plan. It improves the handling efficiency and reduces the labor intensity. It also provides a certain reference for reducing the production cost.

In view of the problems such as imperfect waste water treatment process, low automation level and unstable process parameter commissioning in a uranium mine, Siemens 1500 series PLC is used as the control system, the control process includes automatic alkali dispensing, acid dispensing, lime over alkali neutralization, PID automatic pH adjustment, automatic wastewater discharge and other functions. The pH callback adopts the segmented gain method, which makes the waste water callback process is faster and more anti-interference. WinCC 7.4 is used as the upper system for remote monitoring and control. The control system, relying on advanced network technology and automation technology, realizes the functions of automatic data collection, online monitoring alarm, automatic parameter adjustment, automatic control of the actuator, etc., realizes unattended wastewater treatment process, and ensures continuous, safe and stable operation of uranium mine waste water treatment process.

In order to continuously improve the scientific research and management level, promote the standardization level of the in-situ leaching uranium industry, and more scientifically and effectively develop and build in-situ leaching uranium mines, the application status and the problems in the application of the relevant standards and technical regulations for in-situ leaching uranium mining in China are emphatically sorted out, analyzed, summarized, and the technical standard system table for in-situ leaching uranium mining is compiled.

The fluoride removal performance of GW-F90 resin was studied through static and dynamic tests, and the effects of adsorption time, initial fluoride concentration, pH and impurity ions on the fluoride removal performance of the resin were investigated. The influence of different desorbers on the desorption performance of the resin was investigated, and the mechanism of fluoride removal of the resin was determined. The research shows that the dynamic adsorption capacity of GW-F90 resin is 75.3 mg/g, the fluoride removal rate of the resin single adsorption can reach 92.7%, and the desorption rate is 98.7% when 10% sodium hydroxide solution is used to desorb the resin. GW-F90 resin has good selectivity and fluoride removal performance, and can effectively remove fluoride from fluoride-containing water.

Aiming at the problems of high turbidity and organic phase content in the uranium-molybdenum raffinate, which affect the return utilization, the experimental study on the removal of organic phase in the raffinate by flocculation pretreatment was carried out. The results show that the turbidity and organic phase contents in the raffinate can be reduced from 1 500 NTU and 294 mg/L to 0 NTU and 44.8 mg/L respectively under the conditions that the dosage of C6140 is 2.0 g/m³ raffinate, stirring speed is 60 r/min, stirring time is 10 s, and static time is 40 min after stirring. The process parameters obtained from the study have strong adaptability to the change of turbidity of raffinate, and the flocculation pretreatment process parameters can be used in production.

In order to optimize the radiation shielding of natural uranium repository, taking the design limit of the external dose rate of the shielding of natural uranium repository as the reference control objective, and on the basis of analyzing the accuracy of existing shielding calculation methods, Microshield software is used to optimize the radiation shielding calculation method of natural uranium repository, especially the source term model. This method is based on the single storage barrel source model, the influence of uranium daughter and the superposition of several storage barrels is mainly considered. The calculation results are close to the actual monitoring results, and the calculation method is reliable, which can provide effective support for the radiation shielding design scheme of natural uranium repository.

According to the requirements of safety monitoring in the decommissioning of uranium tailings pond, the first dam of a uranium tailings pond is taken as a pilot project. By deploying Beidou displacement monitoring terminals and various sensors at key points such as the surface of uranium tailings dam and the reservoir area, the real-time monitoring of the tailings pond and the prediction and early warning of the trend of surface deformation, the settlement trend of the dam and the variation trend of water level in the reservoir are realized, so as to predict the stability of the dam in advance and master the safety of the dam. Under the guidance of the intelligent monitoring and prevention system, a comprehensive monitoring platform is developed to provide advanced technical means for the decommissioning and management of the uranium tailings pond in the uranium industry, thus transforming passive “supervision” into active “monitoring”. The research results can provide reference for safety monitoring and intelligent prevention of other uranium tailings ponds.

Long-term monitoring and maintenance of decommissioned uranium mining and metallurgy facilities is an important insurance for regional environment and public health. Taking the decommissioned facilities during and before 12th Five-Year Plan which under long-term monitoring and maintenance as study subjects, the method, process, guarantee condition of monitoring and maintenance, as well as the radiation safety situation of the facilities were investigated. Based on the study and investigation, the problems in long-term monitoring and maintenance were analyzed, and rationalized suggestions for process improvement were proposed.

It is difficult to treat radioactive wastewater by increasing the area of evaporation pool alone when using natural evaporation process. Taking the concentrated water of electrodialysis and the wastewater of evaporation pond in a neutral in-situ leaching uranium mine as the research object, MVR evaporation process was used to investigate the quality of condensate water and evaporation effect under different pressures and temperatures. The results show that the condensate water can meet discharge or reuse standards, the volume reduction rate reaches 95%, and the MVR has the best evaporation effect at 0.07 MPa and 90 ℃.

The special acceptance is based on the archive, the archive acceptance of uranium mining and metallurgy research project is an important link in the project acceptance. In view of the problems existing in the archive acceptance of research project, the existing problems and their causes from the perspectives of integrity, accuracy, systematization, standardization and security were analyzed, and some reasonable suggestions to solve the related problems were put forward.