某离子型稀土矿采矿活动对地下水的影响分析

离子型稀土原地浸矿工艺原理是用硫酸铵作为浸矿液,把呈吸附态的稀土离子交换浸出并回收稀土元素。该工艺对环境的影响主要是由于浸矿液的渗漏而造成地下水中氨氮浓度增加。针对该种工艺,如何采取有效措施保护地下水质量意义重大。以某稀土矿地下水环境影响评价为例,通过设置两种情景模式,应用数值法来证明地下水水力截获是原地浸矿区地下水质量保护的有效措施。

Analysis for impact of mining activities on groundwaterin a ion-absorbed rare earth mine

In order to collect rare earth elements from ion-absorbed rare earth mineral, ammonium sulfate has been widely used as a leaching liquid for in-situ leach mining. Inevitably, the concentration of ammoniacal nitrogen in groundwater system may be elevated due to leaking of Leachate. Therefore, how to protect the groundwater quality with effective measures is a significant issue. Taking a rare earth mineral as example, this paper proves that the groundwater hydraulic capture method is an effective measure to protect the groundwater quality of in-situ leach mining area by comparing the groundwater EIA results on two different conditions using numerical methods.