离子型稀土原地浸矿地下水氨氮污染模拟与预测

在查明稀土矿山水文地质条件和开采方案确定的基础上，通过对标准矿块室内淋溶试验和现场试验确定污染源强，利用FEFLOW数值模拟软件对地下水氨氮进行数值模拟，模拟得出4组地下水氨氮浓度最大预测值，第1组位于矿块边缘为1076.22 mg/L，第2组位于超标区范围内的水井为49.18 mg/L，第3组位于外围的未超标区域内的水井为0.51 mg/L，第4组位于距离矿块最近的河流边缘点为1400.80 mg/L.并以图形输出方式定量表现出稀土矿开采过程中及开采完后地下水氨氮变化趋势及其影响范围.研究成果可为赣南离子型稀土原地浸矿制定合理的开采方案，保护矿区地下水环境提供参考依据，从而实现生态环境与经济的协调发展.

Simulation and predication of ammonia nitrogen contamination of groundwater in ionic adsorption rare earth in-situ leaching mining

Based on identifying the hydrogeoglogical conditions of rare earth mines and determining the mining methods, the pollution sources were determined through the indoor leaching test and field test of standard ore block. The numerical simulation of the ammonia nitrogen of groundwater was taken with FEFLOW numerical simulation software, in which the biggest predictive values of the ammonia nitrogen concentration of groundwa-ter in 4 groups were 1 076.22 mg/L, 49.18 mg/L, 0.51 mg/L and 1 400.80 mg/L respectively. The change trend and influence scope of ammonia nitrogen of the groundwater in and after the rare earth ore mining process were quantitively shown with graphical output. The research results can provide rational mining scheme for ionic adsorption rare earth in-situ leaching mining in southern Jiangxi and some references for the groundwater en-vironment protection in mining areas, so as to realize the coordinated development of ecological environment and economy.