China Coal Xinji Energy Co.,Ltd.
School of Resource and Environmental Engineering, Anhui University

稀土元素具有稳定且相似的地球化学性质,被广泛用于研究地下水体与含水层之间的相互作用和地球化学过程。 以淮南煤田板集煤矿为研究区,采集了砂岩水、太灰水和采空区混合水等地下水样,并对这些水样的稀土元素含量和常规水化学离子进行了测试分析,以研究矿区地下水的水化学特征、稀土元素含量分布特征以及相关控制因素等方面的内容。 研究结果表明:矿区地下水中的 Na+ +K+、Cl-、HCO-3 平均质量浓度分别为 669.1、820.3、344.0 mg / L,水质类型主要为Cl-Na、Cl·HCO3 -Na、HCO3 -Na 型。 研究区地下水中的稀土元素含量总体处于较低的浓度范围,其中三个混合水样中出现了重稀土的富集现象,大部分水样则呈现轻稀土富集。 其中,Eu 的含量最高,这是由于 Eu 与钙矿物的结晶沉淀作用导致其从稀土元素中分离出来。 通过相关性冗余分析发现,研究区地下水样中的 Eu 和 Fe 存在一定的线性关系,说明 Fe 氧化物与稀土元素的吸附作用是影响稀土元素含量的重要控制因素之一。 本研究对于深入了解淮南煤田板集煤矿地下水体系中的地球化学过程具体重要意义,并为矿区地下水的评价和管理提供了科学依据。

Rare earth elements possess stable and similar geochemical properties, making them widelyutilized in the study of groundwater-aquifer interactions and geochemical processes. In this study, tak⁃ing the Banji Coal Mine in the Huainan Coalfield as the research area, water samples including sand⁃stone water, gray overburden water, and mixed water from mined-out areas were collected. These sam⁃ples were tested and analyzed for their rare earth element contents, as well as conventional water chem⁃istry ions. The objective was to investigate the hydrochemical characteristics of groundwater in the min⁃ing area, the distribution of the rare earth element as well as the related controlling factors. The resultsshowed that the average mass concentrations of Na+ +K+, Cl-, and HCO3 in the groundwater of themining area were determined to be 669.1, 820.3, and 344.0 mg / L, respectively. Based on the waterquality types, we classified the groundwater primarily into Cl - Na type, Cl - HCO3 - Na type, andHCO3-Na type. Generally, the rare earth element contents in the groundwater fell within a lower con⁃centration range. However, three mixed water samples exhibited significant enrichment of heavy rareearth elements, while most of the water samples demonstrated light rare earth enrichment. Notably, Eudisplayed the highest content, primarily due to its separation from the rare earth element group duringcrystallization and precipitation with calcium minerals. Correlation redundancy analysis unveiled alinear relationship between Eu and Fe in the groundwater samples of the area. The adsorption of Fe ox⁃ides with rare earth might be a significant controlling factor influencing the rare earth element content.This study is of significance to a comprehensive understanding of the geochemical processes in thegroundwater system of the Banji Coal Mine in the Huainan Coalfield. Furthermore, it provides a scien⁃tific basis for the evaluation and management of groundwater in the mining areas.

国家自然科学基金资助项目(42072201);中煤新集科技攻关资助项目(ZMXJ-BJ-JS-2021-20)

杜少能, 李昊志, 蒋召静, 等. 板集煤矿地下水稀土元素地球化学特征[J]. 能源环境保护, 2023, 37(6):167-174.

DU Shaoneng, LI Haozhi, JIANG Zhaojing, et al. Geochemical characteristics of rare earth elements in groundwa⁃ter of Banji Coal Mine[J]. Energy Environmental Protection, 2023, 37(6): 167-174.