CO_2+O_2中性原地浸出采铀矿山井场抽注液平衡与地下水环境的影响关系

地浸矿山采铀过程中既要尽量减少溶浸液向采区外围扩散、流失,又要避免采区外围地下水大量流入采区内部,以减小溶浸液对矿层外围地下水环境影响并提高浸出效率。在钱家店(钱Ⅱ块)铀矿床CO_2+O_2中性浸出地浸采铀矿山,改变抽注液比对矿层地下水水位及水样化学组分进行测量与分析,研究地浸采铀抽注液平衡与地下水环境的影响规律。通过在合理区间内调整井场采区抽注液比,控制矿层溶浸液溶浸范围、减小溶浸液向外围扩散,实现了有效控制地下水化学组分趋于稳定,减小地浸开采对地下水环境影响的目的。研究表明,控制抽液总量大于注液总量0.3%至0.35%时,井场内部形成大的降落漏斗,溶浸液只在井场边缘附近运移,扩散距离可控。

Study on the Relationship of Influence of Drawing Injection Equilibrium and Groundwater Environment by Neutral CO2+O2 In-situ Leaching of Uranium

During the process of in-situ leaching of uranium,in order to minimize the outflow of leaching solution from mining site which cause the solution loss,and prevent the inflow of nature groundwater from surrounding area,therefore,impact of the leaching solution to the groundwater can be reduced and leaching efficiency can be improved as well.At Qianjiadian(two block mining area) uranium deposit,by measurement the groundwater level and analysis the composition of the groundwater under changing the ratio of drawing and injection of flow volume,the research on the rule of influence of drawing and injection equilibrium to the groundwater environment is carried out.By adjusting the ratio of drawing flux to injection flux in reasonable interval,controlling the scope of leaching solution and decreasing leaching solution to flow outsider area,the purpose of control the groundwater chemical composition which is stayed at stable level as well as reducing the impact of groundwater environment by process of ISL can be realized.Study shows that adjusting the ratio of drawing flux to injection flux between 0.3‰ and 0.35‰,the larger groundwater depression can be formed,the leaching solution migration can be only controlled on the edge of well site,so the diffusion distance can be controlled.