In the fine filtration production of filter liquor of monazite alkali decomposition, the use of iron plate and frame filter had problems such as poor filtration effect, low automation level, and significant temperature drop after filtration. Improvements were made to the existing fine filtration process, and the applicability of surface filter as fine filtration equipment for filter liquor of monazite alkali decomposition was studied. The results show that the surface filter with PP and PTFE membrane materials has a filtration retention rate of 93% after one hour, which is higher than the retention rate of the iron plate and frame filter. Compared with the iron plate and frame filtration, the surface filter has better filtration efficiency, higher automation level, and better solution insulation effect, which can be well applied in the fine filtration of filter liquor of monazite alkali decomposition.

The detection method of ²¹⁰Po in the surface water around the decommissioned uranium mine was studied, and the activity level of ²¹⁰Po in the surface water around the uranium mine was investigated. Using iron(III) hydroxide as the carrier, ²¹⁰Po in the water sample was adsorbed and allowed to self-deposit on a copper plate in a hydrochloric acid-sodium chloride system, and then measured on an alpha spectrograph. The detection limit of the method is 0.001 Bq/L,the precision is better than 10%, and the recovery is between 93.4% and 106.6%. The results show that the activity concentration of ²¹⁰Po in the surface water around the decommissioned uranium mine is between 0.001 and 0.223 Bq/L, indicating a certain level of pollution. There is a risk of transferring to humans through drinking water and food chain, resulting in an increase in internal exposure dose to residents. It is necessary to strengthen monitoring of surface water around the uranium mine and evaluation of public exposure.

Aiming at the steeply sloping broken thin orebody in the Mianhuakeng mine, the continuous mining method of deep hole blasting without inter-pillar was proposed. According to the technological characteristics of the method, the "inverted step shape" + up and down hole layout continuous mining, "positive step shape" + upward hole layout continuous mining and "positive step shape" + top pillar + upward hole layout continuous mining were proposed. The GRA-AHP and cloud model were combined to evaluate and optimize the three mining schemes, and it was concluded that the scheme of "positive step shape" + top pillar + upward hole layout is relatively safe and efficient, which provides a feasible technical scheme for the mining of broken orebody in Mianhuakeng mine.

For the salicylic acid chelating resin, the specific surface area and pore size were determined using low temperature nitrogen adsorption-desorption method; and its thermodynamic stability was examined. The effects of solution pH and ρ(Cl^-) on its uranium adsorption performance were studied, and its adsorption isotherms, adsorption kinetics, and desorption performance were also investigated. The results show that the specific surface area of salicylic acid chelating resin is 32.34 m²/g, and the pore size is 32.08 nm, The salicylic acid chelated resin has good thermal stability when the temperature is below 180 ℃. When the pH is in the range of 7~9, the resin has good adsorption performance, and the uranium adsorption capacity can reach 14.1 mg/g dry resin. The presence of Cl^- can reduce the adsorption capacity for uranium. When the ρ(Cl^-) is 3.0 g/L, the uranium adsorption capacity decrease by about 9.2%. When the equilibrium ρ(U) in solution is 400 mg/L, the uranium adsorption capacity of the resin reach its maximum, at 153 mg/g dry resin. After 20 h adsorption, the adsorption process reach equilibrium. Both acidic and alkaline desorption agents show good desorption performance for resins, with desorption rates both above 94%. For the real uranium leaching solution with ρ(U) of 21.2 mg/L and ρ(Cl^-) of 3.36 g/L, the uranium adsorption capacity of the salicylic acid chelating resin can reach 14.7 mg/g dry resin after 24 h adsorption, indicating good uranium adsorption performance.

Based on the efficiency of uranium extraction drilling, a new type of cut-window drilling was developed. The advantages and disadvantages of two different drilling structures were analyzed by comparing the site construction and leaching effect of gravel filling drilling and cut-window drilling. The results show that the construction quality of cut-window drilling is controllable, the drilling operation stability is long, the leaching effect is good, the uranium concentration in the leachate rises quickly, and the recovery rate is high. The comparative use of the two structures provides important theoretical basis and practical application experience for the mining of uranium mine, and the cut-window drilling is helpful to improve the exploitation and utilization of uranium resources.

Acid concentration and uranium concentration in raffinate phase generally need to be measured separately, which is cumbersome and requires a large amount of work. A new method for continuous measurement of acid concentration and uranium concentration in raffinate phase was developed. A strong base was used as titration agent, the color change of the indicator was selected to indicate the titration endpoint. After completing the acid concentration detection, the sulfuric acid and arsenazo III solutions with a certain amount and concentration were added to the above solution to make the solution color, and the absorbance of the color solution was measured at 650 nm. The results show that the precision of measuring acid concentration and uranium concentration is 1.53% and 1.13% respectively, the indication error for measuring acid concentration and uranium concentration is 1.69% and 1.52% respectively. For the measurement of actual water samples, the measurement data of this method is basically consistent with that of the laboratory current methods, the recovery rate of acid concentration measurement is between 97.0% and 102.5%, and the recovery rate of uranium concentration measurement is between 97.0% and 102.0%. The method is suitable for continuous monitoring of acid concentration and uranium concentration in raffinate phase and has accurate and fast characteristics.

With the continuous development of network technology, wireless communication technology has been widely applied and has attracted the high attention from uranium mines. The current development status of various mainstream wireless communication technologies was analyzed, the integrated performance comparison of several commonly used short-range wireless communication technologies was conducted, the current situation of uranium mine network construction was elaborated. Based on the distribution characteristics and network application requirements of uranium mining industrial facilities in China, three wireless technologies, Wi-Fi, GPRS, and ZigBee, were selected for on-site application research. The network transmission of automatic control in mobile control rooms, remote monitoring of well washing vehicles, leakage alarms of wellhead devices, and equipment inspection signals were achieved.

In order to reduce project construction and land acquisition costs, and shorten the project construction cycle, a in-situ leaching mine adopts a quasi-closed circulation system. Compared with traditional in-situ leaching uranium mines, the liquid distribution tank is cancelled and replaced with a liquid collection tank. As the main power source in the quasi-closed circulation system, the liquid distribution pump is prone to tank overflow when it runs unstable, resulting in imbalanced pumping volume in the circulation system and affecting the production progress of the mining area. By adopting measures such as automated real-time monitoring and optimizing the adjustment mode of the mixing pump, the operational stability of the mixing pump in the quasi-closed circulation system of in-situ uranium leaching has been effectively improved.

In response to the problems of high cost and low reuse rate of wired networks, small coverage range and high interference of wireless networks, the in-depth research was conducted on the existing network system in uranium mines, and demand analysis was carried out based on the actual needs. With the goal of full coverage of wireless local area networks for signal wireless transmission, positioning, and remote monitoring of underground personnel and equipment, and on the basis of unified network transmission protocol, the applicability of wireless network transmission technologies such as 5G and Wi-Fi was analyzed. Suitable equipment and working frequency bands were selected, and a network testing platform was built for wireless signal transmission rate and delay experiments to verify the applicability of underground wireless technology applications. The result can guide the construction of underground networks in uranium mines and provide reliable network support for underground production equipment monitoring, environmental monitoring, positioning, communication and important data transmission.

Blockage of ore bearing layers is the most common technical problem in in-situ leaching of uranium. A certain experimental mining area has been operating for about 200 days, and the injection pressure of the injection well has increased to 1.65 MPa, and the average injection flow rate has decreased by 51.87%, and serious blockage has occurred in the surrounding ore-bearing layers. The calculation shows that when the natural flow field conditions are transformed into the leaching flow field conditions, the groundwater flow velocity can be rapidly increased by tens to hundreds of times. Hydraulic erosion is the dynamic condition for the migration and precipitation of debris in the ore-bearing layers around the pumping well. The mineral debris and chemical precipitation carried in the leaching solution, which are retained in the tail liquid after surface filtration and resin bed adsorption, are re-deposited and accumulated in the ore bearing layer around the injection well, which is the direct cause of its blockage. During the research period, mechanical blockage was the main factor, accompanied by chemical precipitation blockage. Based on the research results of the maximum pore throat diameter of previous ore bearing layers, combined with underground television observation, the particle size of the leaching solution, well washing water, and the chemical composition analysis of the settling dry residue of the well washing water, it is determined that the mineral debris is mainly clay powder sand particle level debris, and the chemical precipitation is mainly CaCO₃, MgCO₃, Fe(OH)₃, with a small amount of FeCO₃. For this reason, with the goal of “preventing blocking”, a hydrocyclone separator has been added. The surface solid-liquid separation system coupled with “natural sedimentation-hydrocyclone separation-mechanical screening” has achieved obvious results, which is expected to be popularized and applied after further research.