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.

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.

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.

Since the independent path with so many applications in the ventilation network, it’s significant to search a quick algorithm in the complex network, which can optimize the regulation of ventilation network effect. However, the traditional algorithm of independent path can’t deal with special network search problem, the paths tending to be long, which can’t assure the independence and completeness simultaneously. To solve the problems of traditional independent path search algorithms, the key search theory of independent path was studied systematically and thoroughly. Based on the analysis about the limitation of traditional algorithms, an improved algorithm of independent path was presented. The problem of cut edge and cut vertex in the network were handled to avoid the infinite loop or abortion. The failure cause of the search of independent path completeness was analyzed. And this algorithm can solve the problems of ventilation network that includes unidirectional circuit by modifying the memory search strategy. An adaptive method is proposed according to the improved independent path algorithm, which can get a regulation tree with optimized position and get a set of optimal solutions of the air quantity regulation through increasing resistance.

Beishan underground research laboratory is the first laboratory in China to study the geological disposal of high-level radioactive waste. A rock crane beam was arranged in the main test level(-560 m) of the underground laboratory. Based on the relevant design standards, the calculation and design steps of rock crane beam were expounded. On this basis, the optimal design scheme of rock crane beam with small crane tonnage was proposed. After adopting this scheme, the material consumption and precious underground space of rock crane beam can be effectively saved, which has practical reference significance for the design of rock crane beam of small tonnage crane in the future.

The main causes of tailings dam failure include seepage damage, slope instability, seismic liquefaction, and ultra-high dam height. The high seepage line inside the tailings dam may cause seepage damage, and in severe cases, it may lead to slope instability, damage, and even dam failure. The common methods for reducing the seepage line of dam bodies have problems such as high construction difficulty, high manual maintenance cost, and complex equipment maintenance management. The horizontal drainage method is used to install horizontal filter pipes in the drainage blind ditch close to the horizontal level to reduce the seepage line. This project adopts the method of drilling horizontal holes inside the dam body and installing seepage pipes inside the holes to form a horizontal drainage body. The seepage pipes form a drainage network through the main collection pipe outside the dam body. The water inside the dam seeps into the drainage pipes, then converges to the main water collection pipe, and finally flows out of the dam by gravity. This method has the advantages of low cost, low energy consumption, and easy management, and is a practical and feasible method to reduce the seepage line of tailings pond。

The method and practice of applying automatic inspection technology in an in-situ leaching uranium mine were studied. The advanced technologies, such as unmanned aerial vehicle(UAV), infrared thermal imaging and laser scanning, were adopted, which can realize automatic inspection and monitoring of mine operation. Mine inspection by advanced UAV replaces traditional manual inspections. In the process of UAV inspection, infrared thermal imaging technology is used to dynamically monitor the orifice and overhead lines, and abnormal conditions can be found in real time. The laser scanning technology is realized by using the load lens, which can accurately scan the physical characteristic structure of the mine surface. The UAV inspection technology not only improves the level and efficiency of mine inspection, but also reduces the human and material costs of mine inspection and supervision, and provides reference for related fields.

Spectinomycin is an alkaline water-soluble aminoglycoside antibiotic, produced by the fermentation of actinospectacin. The prewashing process of D152 resin with EDTA-2Na was studied, by selecting the proper concentration, pH and flow rate of the prewashing solution, the extraction of high purity macromycin hydrochloride was realized, and the recovery process of EDTA-2Na was determined. The optimal prewashing parameters were obtained: the concentration of EDTA-2Na solution is 0.015 mol/L, the pH of prewashing solution is 7.5~8.0, and the flow rate is 1.0~2.0 BV/h. The prewashing process is simple, low cost and high recovery, which ensures the adsorption yield of D152 resin and realizes the green extraction.