摘要
对新疆伊犁盆地某CO2+O2地浸铀矿山井场及其周边地下水的主要化学成分和硫同位素进行了分析。结果表明,CO2+O2地浸采区的地下水具有较高的SO24-浓度,其范围为681mg/L~1530mg/L,平均值为1161.8mg/L,显著高于地下水本底水平。采区地下水中SO24-的δ34 SV-CDT值为-19‰~-24.2‰,平均值为-22.3‰,与矿层中黄铁矿的硫同位素组成一致,说明地下水的SO24-主要来源于矿层中黄铁矿的氧化溶解。采区外围地下水的SO24-浓度与本底值接近,且δ34 SV-CDT值(-11.1‰~1.6‰,平均值为-7.2‰)与采区内的存在明显差异,说明地浸采区内的污染物得到了有效控制,没有造成外围地下水的污染。矿层中黄铁矿的氧化对CO2+O2地浸采铀具有不利的影响,不仅会产生SO24-污染物,特别是可形成次生矿物沉淀而堵塞孔隙,降低矿层的渗透性。
The main chemical constituents and sulfur isotopes of surrounding area and groundwater in a CO2+O2 in-situ leaching uranium mine in Ili Basin,Xinjiang,were analyzed.The results showed that the groundwater in the CO2+O2 in-situ leaching area has a high SO24-concentration ranging from 681~1530 mg/L with an average value of 1161.8 mg/L,which is significantly higher than the groundwater background level.Theδ34 SV-CDTvalue of SO24-in the groundwater of mining area is from-19‰to-24.2‰,with an average value of-22.3‰,which is consistent with the sulfur isotope composition of pyrite in the ore layer,indicating that SO24-in groundwater mainly comes from the oxidation and dissolution of pyrite in the ore layer.The concentration of SO24-in the groundwater in the peripheral area of the mining area is close to the background value,andδ34 SV-CDTvalue(ranging from-11.1‰to 1.6‰,with an average value of-7.2‰)is significantly different from that in the mining area,indicating that the pollutants in the in-situ leaching area have been effectively controlled without causing the pollution of the surrounding groundwater.The oxidation of pyrite in the ore layer has an adverse effect on the CO2+O2 in-situ leaching of uranium,which not only produces SO24-pollutants,but also can form secondary mineral precipitation to block pores and reduce the permeability of the ore layer.
作者
黄武扬
谭凯旋
李咏梅
李熙琪
刘振中
HUANG Wuyang;TAN Kaixuan;LI Yongmei;LI Xiqi;LIU Zhenzhong(School of Resource Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes,Hengyang,Hunan 421001,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第1期111-115,共5页
Mining Research and Development
基金
国家自然科学基金项目(U1703123)。
关键词
CO2+O2浸出
地浸采铀
硫同位素
地下水
CO2+O2 leaching
In-situ leaching of uranium
Sulfur isotope
Groundwater
