煤矿酸性水中稀土元素的分布模式及影响因素  

Fractionation patterns and influence mechanism of rare earth elements in acid mine drainage

作　　者：孙红福[1] 赵峰华[1] 张梦[1] 李静琴[1] 

机构地区：[1]中国矿业大学地球科学与测绘工程学院,北京100083

出　　处：《中国矿业大学学报》2012年第2期282-288,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(40972110;41102096);教育部科学技术研究重点项目(109033);教育部新世纪优秀人才支持计划项目(NCET-07-0801);中央高校基本科研业务费专项资金项目(2009QD01;2009QD08)

摘　　要：通过对山西省两个不同矿区的酸性矿井水、沉积物、围岩以及煤样中的稀土元素(REE)含量的测定,并结合吸附解吸实验和地球化学模拟软件(PHREEQC),研究了酸性矿井水中REE的分布模式及其主要的影响因素.研究表明:1)酸性矿井水中REE的含量很高,且呈典型的中稀土元素(MREE)富集模式分布;2)酸性水中的REE主要来源于围岩和黄铁矿的酸淋滤,而煤中REE的丰度相对较低;3)pH是影响酸性矿井水中REE含量及其分布模式最重要的因素;4)随着酸性矿井水pH的升高,Mn的氢氧化物沉淀对REE的含量影响最大,并且含铁沉积物优先吸附重稀土元素和中稀土元素;5)酸性矿井水中的REEs主要络合种类为REE(SO4)+(52.8%～79.4%),其次为REE(SO4)2-和REE3+.The NASC-normalized patterns of the rare earth elements （REE） and their main in- fluence factors in acid mine drainage （AMD） from two coal mines of Shanxi province, North China, were investigated by determining the concentrations of REEs in the AMD, sediments, country rocks and coal samples, as well as further analyzing through adsorption and desorption experiment and hydrogeochemistry software PHREEQC. The results show that： 1） AMD has high REE concentrations and its NASC-normalized patterns are typically convex~ 2） bedrock and pyrity were the main sources of REE in AMD, the REE abundance of coals were very low~ 3） pH is the most important factor influencing the concentration and NASC-normalized pat- terns of REE in AMD~ 4） with the increasing of pH, hydroxide Mn has more influence on REE concentrations, and bearing-iron sediments in AMD preferentially to remove heavy REEs and middle REEs compared with light REEs; 5） the REEs speciation modeling indicates sulfate complexe （REE（SO4）＋ , 52.8%-79.4%） is the dominant REEs species,and REE（SO4）-2 and REE3＋ are the secondary REEs species in the AMD.

关 键 词：酸性矿井水 中稀土富集 氢氧化物 沉积物 络合种类 

分 类 号：X142[环境科学与工程—环境科学]