巴彦乌拉铀矿现场地浸条件试验与地浸场水动力模拟
发布时间：2018-11-05 17:45
【摘要】：我国铀资源开发的重点是砂岩型铀矿,内蒙古是我国砂岩型铀矿开发的大基地。巴彦乌拉铀矿床是我国第一个在内蒙古投入生产的砂岩型铀矿,具有“低品位、厚砂体、高渗透”的特点。本文在前人室内研究工作的基础上,首先通过开展现场地浸条件试验,研究该矿床现场酸法地浸采铀特征及可行性;然后采用地下水数值模拟软件VisualMODFLOW建立研究区地浸采铀水动力模型,研究不同抽注液流量和抽注孔距离条件下的溶浸液渗流特征。现场条件试验结果表明,酸法地浸工艺适合巴彦乌拉铀矿床铀浸出,且氧化剂能够强化浸出效果;条件试验期间,CDI-1和CDI-2单元浸出液平均铀浓度分别为19.61mg/L和46.69mg/L,试验结束时,两单元浸出液铀浓度分别保持在18mg/L和30mg/L左右,浸铀效果良好;试验单元的浸出效果与矿石品位、矿层厚度、平米铀量及含矿层所处地球化学环境有关;较高的酸度可以保持较高的铀浓度,溶浸液酸度为10g/L时,两单元浸出液平均铀浓度分别为21.72mg/L和54.57mg/L,是酸度为8g/L阶段的1.05和1.18倍。模拟结果表明,在抽注平衡条件下,地浸单元的平均水力梯度随抽液流量增加而增加,随抽注孔距离增加而减小;地浸场有效溶浸面积随抽注液量和抽、注液孔距离的增大而增大;溶浸液利用率随抽注液量增大而增高,随抽、注液孔距离的增大而降低;在抽注平衡的“四注一抽”条件下,当抽注孔距离为30m,抽液孔流量为12m3/h时,溶浸液流速适宜,溶浸面积约6280m2,溶浸液利用率在80%以上,可获得较好的浸出效果。本论文研究成果对巴彦乌拉铀矿地浸工艺技术及地浸工艺参数的确定具有借鉴指导意义,对于抽注液流量及抽注孔距离的确定具有参考价值。
[Abstract]:Sandstone-type uranium deposits are the key point of uranium resources development in China, and Inner Mongolia is a large base for the development of sandstone-type uranium deposits in China. Bayan Ula uranium deposit is the first sandstone-type uranium deposit in Inner Mongolia, which has the characteristics of "low grade, thick sand body and high permeability". On the basis of previous laboratory research work, this paper studies the characteristics and feasibility of in-situ leaching of uranium by in-situ acid leaching of the deposit through in-situ leaching tests. Then the hydrodynamic model of in-situ leaching of uranium in the study area was established by using the groundwater numerical simulation software VisualMODFLOW to study the seepage characteristics of leaching solution under different pumping fluid flow and pumping hole distance. Field test results show that acid in-situ leaching process is suitable for uranium leaching of Bayan Ura uranium deposit, and oxidant can enhance leaching effect. During the conditional test, the average uranium concentration of CDI-1 and CDI-2 unit leaching solution was 19.61mg/L and 46.69 mg / L, respectively. At the end of the experiment, the uranium concentration of the two unit leaching solution was kept at 18mg/L and 30mg/L, respectively, and the leaching effect was good. The leaching effect of the test unit is related to the ore grade, the thickness of the ore bed, the uranium content in the square meter and the geochemical environment of the ore-bearing bed. When the acidity of solution is 10g/L, the average uranium concentration of the two unit leaching solution is 21.72mg/L and 54.57 mg / L, which is 1.05 and 1.18 times of that of 8g/L stage. The simulation results show that under the condition of pumping equilibrium, the average hydraulic gradient of in-situ leaching unit increases with the increase of pumping flow and decreases with the increase of pumping hole distance. The effective leaching area of the in-situ leaching field increases with the amount of liquid injected and the distance of the injection hole increases, and the utilization ratio of the solution increases with the increase of the volume of the liquid injection, and decreases with the increase of the distance of the injection hole. Under the condition of "four injection and one pumping", when the distance of pumping hole is 30m, the flow rate of solution is 12m3/h, the flow rate of solution is suitable, the area of leaching is about 6280m2, and the utilization ratio of solution is more than 80%. The better leaching effect can be obtained. The results of this paper can be used for reference in the determination of in-situ leaching technology and in situ leaching process parameters of Bayan Ula uranium mine, as well as for the determination of pumping fluid flow rate and pumping hole distance.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD868
本文编号：2312835
[Abstract]:Sandstone-type uranium deposits are the key point of uranium resources development in China, and Inner Mongolia is a large base for the development of sandstone-type uranium deposits in China. Bayan Ula uranium deposit is the first sandstone-type uranium deposit in Inner Mongolia, which has the characteristics of "low grade, thick sand body and high permeability". On the basis of previous laboratory research work, this paper studies the characteristics and feasibility of in-situ leaching of uranium by in-situ acid leaching of the deposit through in-situ leaching tests. Then the hydrodynamic model of in-situ leaching of uranium in the study area was established by using the groundwater numerical simulation software VisualMODFLOW to study the seepage characteristics of leaching solution under different pumping fluid flow and pumping hole distance. Field test results show that acid in-situ leaching process is suitable for uranium leaching of Bayan Ura uranium deposit, and oxidant can enhance leaching effect. During the conditional test, the average uranium concentration of CDI-1 and CDI-2 unit leaching solution was 19.61mg/L and 46.69 mg / L, respectively. At the end of the experiment, the uranium concentration of the two unit leaching solution was kept at 18mg/L and 30mg/L, respectively, and the leaching effect was good. The leaching effect of the test unit is related to the ore grade, the thickness of the ore bed, the uranium content in the square meter and the geochemical environment of the ore-bearing bed. When the acidity of solution is 10g/L, the average uranium concentration of the two unit leaching solution is 21.72mg/L and 54.57 mg / L, which is 1.05 and 1.18 times of that of 8g/L stage. The simulation results show that under the condition of pumping equilibrium, the average hydraulic gradient of in-situ leaching unit increases with the increase of pumping flow and decreases with the increase of pumping hole distance. The effective leaching area of the in-situ leaching field increases with the amount of liquid injected and the distance of the injection hole increases, and the utilization ratio of the solution increases with the increase of the volume of the liquid injection, and decreases with the increase of the distance of the injection hole. Under the condition of "four injection and one pumping", when the distance of pumping hole is 30m, the flow rate of solution is 12m3/h, the flow rate of solution is suitable, the area of leaching is about 6280m2, and the utilization ratio of solution is more than 80%. The better leaching effect can be obtained. The results of this paper can be used for reference in the determination of in-situ leaching technology and in situ leaching process parameters of Bayan Ula uranium mine, as well as for the determination of pumping fluid flow rate and pumping hole distance.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD868
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