MOE Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology
CMOC Group Limited

随着工业发展和产业革新，以稀有元素为主体的关键金属矿产需求量与日俱增。更多的专家认为煤系矿产资源具有获取关键金属矿产的潜在可能，此类资源也因此受到了国内外的高度关注。我国淮北煤田煤炭资源丰富，为研究其煤中微量元素地球化学特征，并判断稀有金属工业潜力，选取朱庄矿5煤、8煤、10煤作为研究对象，采用工业分析、XRF和ICP-MS等测试手段对样品进行了煤质分析和主微量元素含量测试。结果表明：与世界煤相比，朱庄矿煤中大部分微量元素富集程度较高，如Li、Cr、Co等属于高度富集。与5煤和8煤相比，10煤中微量元素的富集程度较低，其中V、Mn、Rb、Cs的含量属于正常范围。通过ω(Al2O3)/ω(TiO2)比值、元素地球化学特征，分析得出研究区沉积源区为长英质岩，从山西组到下石盒子组古盐度由海相向咸水相转变，古气候为温暖潮湿的还原环境。另外，稀土元素表现为轻中稀土富集型，且Eu、Y正异常和Ce负异常都显示出朱庄矿沉积环境受到了海水和岩浆热液的影响。因此，朱庄矿煤中微量元素异常富集可能是受到了沉积环境、海水和热液的共同影响。另外，研究区稀土元素较为富集，其总含量接近甚至高于工业品位，经REY展望系数（Coutl）和多种沉积物矿产比较，认为研究区样品中5煤和8煤稀土元素有希望作为REY原料，10煤则效果较差。

With industrial development and innovation, the demand for key metal minerals dominated by rare earth elements is increasing day by day. More experts believe that coal measures mineral resources have the potential to obtain key metal minerals, and such resources have therefore received high attention at home and abroad. Huaibei coalfield in China is rich in coal resources. In order to study the geochemical characteristics of trace elements in its coal and judge the industrial potential of rare metals, No. 5 coal, No. 8 coal and No. 10 coal in Zhuzhuang Coal Mine were selected as the research objects. The samples were analyzed by means of industrial analysis, XRF and ICP-MS. The results show that compared with the world coal, most trace elements in Zhuzhuang Coal Mine are highly enriched, such as Li, Cr, Co, etc. Compared with 5 coal and 8 coal, the concentration of trace elements in 10 coal is low, and the contents of V, Mn, Rb and Cs belong to the normal range. Through the analysis of Al2O3/TiO2 ratio and element geochemical characteristics, it is concluded that the sedimentary source area of the study area is felsic source rock, the paleosalinity from Shanxi formation to Lower Shihezi Formation changes from marine facies to saline water facies, and the paleoclimate is a warm and humid reduction environment. In addition, rare earth elements are enriched in light and medium rare earth elements, and Eu, Y positive anomalies and Ce negative anomalies all show that the sedimentary environment of Zhuzhuang mine is affected by seawater and magmatic hydrothermal solution. Therefore, the abnormal enrichment of trace elements in Zhuzhuang Coal Mine may be affected by the sedimentary environment, seawater and hydrothermal solution. In addition, the study area is relatively rich in rare earth elements, and its total content is close to or even higher than the industrial grade. Through the comparison of REY prospect coefficient (Coutl) and a variety of sediment minerals, it is considered that the rare earth elements of coal 5 and coal 8 in the sample of the study area are promising as REY raw materials, while the effect of coal 10 is poor.

国家重点研发计划资助项目(2021YFC2902003)。

李　祥，李　伍. 淮北煤田朱庄煤矿煤中微量元素地球化学特征[J]. 煤炭科学技术，2023，51（8）：178−191

LI Xiang，LI Wu. Geochemical characteristics of trace elements in Zhuzhuang Coal Mine of Huaibei coalfield[J]. Coal Science and Technology，2023，51（8）：178−191