For a multi-layer sandstone-type uranium ore in an in-situ leaching uranium mine in Inner Mongolia, four experimental methods of layered injection and layered extraction, layered injection and mixed extraction, mixed injection and layered extraction, mixed injection and mixed extraction were designed. The amount of injected liquid, leaching situation, advantages and disadvantages of each schemes were analyzed. The feasibility of single well layered injection was explored, and the key technology of single well layered extraction was solved. The results show that the layered injection and layered extraction method has the fastest increase in uranium concentration of the leachate, the best leaching effect, and lower construction cost, which has good application and promotion prospects.

This article studies the pretreatment methods of solutions with high iron content, high nitrate content, and low uranium content. The results show that under the pretreatment conditions of using 4% TOPO cyclohexane solution as the extractant, a volume ratio of organic phase to water phase of 1:6, an extraction time of 2 minutes, an extraction temperature of 25℃, and a mixed complexing agent as the counter extractant, the extraction efficiency reached 99.0%, and the counter extraction efficiency was 99.0%. The 5-Br-PADAP colorimetric method can accurately determine the uranium content in the pretreated solution after extraction reverse extraction of high iron, high nitrate, and low uranium content solutions. The relative standard deviation of this method is less than 8.11%, the recovery rate of spiking is 96.0%~99.5%, and the detection limit of this method is 0.013 mg/L.

The data related to mine resource reserves is extensive and subject to frequent changes. Traditional resource reserve management system typically handles singular data types, which leads to low operational efficiency among personnel and increases the risk of data loss. In response to national policies advocating for the use of three-dimensional digital methods in resource reserve management, and to address the challenges in controlling resource reserve data caused by weak informatization equipment and infrastructure, the Shitoumei No. 1 open-pit coal mine in the Santanghu mining area of Hami, Xinjiang, has actively promoted intelligent construction. The mine has implemented a three-dimensional dynamic management system for mineral resource reserves, designed using a combination of B/S and C/S architectures. This system is based on digital three-dimensional models that calculate and display dynamic changes in data during production processes in real time. The resource reserve management system operates on a logical architecture of data storage, platform services, and application services, enabling refined management across mining ledgers, data management and reporting, mining rights, exploration activities, and coal quality. Since its deployment, the system has been performing well, reducing the discrepancy rate in coal output design by 16%, achieving a 100% rate of centralized data control, and significantly enhancing the accuracy of resource reserve evaluations. The system has improved the overall efficiency of resource reserve management and advanced the informatization of open-pit coal mine reserve management within the company.

The remediation of groundwater environment in the post-mining area at in-situ leaching uranium mines has aroused widespread public concern. The long-term change of groundwater U concentration in the post-mining area is still unclear. Field investigation and numerical simulation methods were comprehensively used in this study, and a typical post-mining area of a “CO₂+O₂” in-situ leaching uranium mine in northern China was taken as the research object. On the basis of identifying the distribution characteristics of groundwater U in the post-mining area, the natural attenuation trend of U in groundwater at different times was quantitatively predicted, and the long-term change of U concentration was quantified. The results show that the concentration of U in the groundwater in the post-mining area is 0.273~5.24 mg/L, and the sampling points with U concentration lower than 2.5 mg/L accounted for 64%. The simulation results show that in the post-mining stage, the groundwater flow direction tend to the regional groundwater flow direction. When the natural attenuation process of U is not considered, U in groundwater migrate to 167 m downstream after 100 years of final mining, and the predicted migration distance is conservative. When the natural attenuation of U is considered, the migration distance of U is only 42 m after 100 years of final mining. The concentration of U in the groundwater in the mining area is reduced from the initial 2.5 mg/L to below 1.0 mg/L. Natural attenuation can reduce the migration distance and the concentration of groundwater U in the post-mining area, and the monitored natural attenuation (MNA) technology can be used as an alternative scheme for groundwater remediation at in-situ leaching uranium mines in the future.

Due to the influence of special mining technology in open-pit mines, shoveling equipment is prone to safety accidents during operation. Aiming at the problems of large inspection blind area and untimely response in the management of shoveling equipment in open-pit mine enterprises, a high slope and cross operation control scheme of shoveling equipment is proposed based on high precision positioning technology. The high slope operation control scheme combines terrain data, uses positioning technology, through on-site measurement and operation scheduling, real-time monitoring and alarm, on-site processing and record verification, real-time monitoring of the operation height of the shoveling equipment and judging whether it exceeds the safety range. The cross operation control scheme of shoveling equipment monitors the operation spacing in real time through the confirmation of operation spacing before operation, the audit of scheduling plan and the inspection of operation spacing. The proposed control scheme realizes the safe and fine management of the operation spacing and excavation height of the shoveling equipment, effectively reduces the risk of accidents in the process of open-pit mining, and improves the operation efficiency.

Uranium conversion production mainly includes fluorination, hydrofluorination, and electrolytic fluorine production processes. Among which the electrolytic fluorine production process and fluorination process are the main factors affecting production capacity and continuous and stable operation. Based on the analysis of the principle and current situation of electrolytic fluorine production, the influences of hydrogen fluoride feeding, carbon plate operation and maintenance, electrolyte operation parameters, etc. on the operation of electrolytic fluorine production process were studied. The key points of control of a small amount of continuous hydrogen fluoride feeding and carbon plate current stability were analyzed. Measures such as optimization of hydrogen fluoride feeding mode, depolarization treatment process, carbon plate current monitoring, and regular electrolyte replacement were adopted. The operation of electrolytic fluorine production process is more stable and efficient.

Traditional natural uranium storage relies on manual forklifts or cranes for unloading and storage, which suffers from drawbacks such as high labor intensity, low efficiency, high radiation exposure for personnel, high risk factors, low warehouse utilization, inefficient inventory management, and unreliable accuracy. Aiming to address these issues, an intelligent vertical storage system is designed to achieve efficient vertical storage, automatic retrieval, real-time querying, and rapid inventory.Compared to the stacker crane + shuttle scheme, the dual extended stacker crane scheme offers superior performance in inventory efficiency, network transmission, equipment reliability, maintenance methods, and shelf structure requirements. Based on this analysis of intelligent natural uranium storage processes and optimized equipment selection, a smart vertical storage solution tailored for natural uranium storage has been researched and designed.

A pretreatment process for uranium containing waste liquid was proposed to address the issues of nanofiltration membrane blockage and ion exchange resin poisoning in the treatment of uranium containing waste liquid. On the basis of determining the optimal process parameters for chemical precipitation and organic matter decomposition in the laboratory, engineering design and verification were carried out. The results show that after pretreatment, the turbidity of the waste liquid can be reduced to 16.25 NTU (removal rate of 98.74%), and COD can be reduced to 110.25 mg/L (removal rate of 87.13%). The waste liquid after pretreatment meets the water quality requirements of nanofiltration and ion exchange resin, and the pretreatment process effectively solves the problems in the treatment of uranium containing wastewater during uranium conversion.

To investigate the influence of factors such as slope ratio, rainfall intensity, and protection form on the erosion characteristics of dam slopes, a full-scale artificial rainfall simulation test platform was built to simulate the runoff and sediment production processes on slopes with different slope ratios, rainfall intensities, and protection forms. The differences in runoff and sediment production on slopes under different operating conditions were analyzed. The results show that the starting time of runoff decreases with the increase of slope ratio and rainfall intensity, and is greatly affected by rainfall intensity. The trench drainage protection, due to the formation of slope runoff channels, advances the time of runoff generation. The grass planting and gravel slope protection on the slope reduce the response of the slope to rainfall to varying degrees, resulting in a significant delay in the start time of runoff generation. The rainfall intensity has the most significant impact on the runoff yield. The rainfall intensity increases from light rain to rainstorm, with the runoff yield increasing by 7.6 times, the sediment yield increasing by 18.5 times, and the time for the sediment yield to reach its peak reduced by about 75%. The ditch drainage slope protection forms a runoff channel, resulting in the maximum flow rate on the slope surface. The grass planting slope protection and gravel slope protection can significantly reduce the sediment yield on the slope surface. The grass planting slope protection improves the physical and chemical properties of the soil to a certain extent, increases the porosity of the soil, increases the infiltration rate of the slope surface, makes the runoff process smoother, and has better erosion resistance.

The in-situ leaching wastewater of uranium mining and metallurgy is characterized by large volume, acidity, and low radioactivity, etc. The evaporation ponds of some uranium mining and metallurgical enterprises cannot meet the demand of expanding production. The advantages and disadvantages of forced evaporation technology such as vacuum evaporation, three-effect evaporation and MVR(Mechanical Vapor Recompression) evaporation were compared and analyzed. It was found that, under long-term use, MVR technology has higher efficiency, lower exhaust emission, and lower energy consumption, making it relatively more suitable for in-situ leaching wastewater. Based on MVR technology, a fully integrated control forced evaporation system was designed and constructed. The heating temperature and material of the equipment were determined according to the waste liquid composition. The on-site device achieved automatic control of temperature, pressure, and liquid level, as well as continuous cyclic evaporation. The actual test shows that the evaporation capacity and efficiency coefficient of the device are positively correlated with the evaporation temperature.