贵州盘县矿区煤中伴生元素的地球化学特征

Geochemical features of associated elements in coal from Panxian Minefield of Guizhou

为了探究贵州盘县矿区松河煤矿煤中伴生元素的富集程度、赋存状态和富集成因,以松河煤矿一采区、二采区和三采区9个煤样为研究对象,使用X射线荧光光谱仪(XRF)和电感耦合等离子体质谱仪(ICP-MS)对煤中常量元素和微量元素进行测定,结合显微镜、X射线衍射仪(XRD)以及相关理论分析及逐级化学提取试验(SCEE)分析元素的赋存状态。研究结果表明,所采煤层煤中常量元素Si、Al、Ca、Mg、Mn含量相对其他地区煤而言,含量均值正常,其余常量元素含量亏损;煤中微量元素As、Co含量相对煤而言明显富集;煤中As主要赋存在硅铝酸盐矿物、有机质和硫化物中,Co主要赋存在硅铝酸盐态和硫化物中,该地区峨眉地幔热柱及峨眉山玄武岩岩浆的热液作用导致煤中As和Co元素异常富集。

In order to study an enrichment degree,deposition condition and enrichment causes of the associated elements in the coal from Panxian Songhe Mine,Guizhou,taking nine coal samples from No.1 mining block,No. 2 mining block and No. 3 mining block of Songhe Mine as the study objects,a X-ray fluorescence spectrometer（ XRF） and the inductively coupled plasma mass spectrometry（ ICP-MS）were applied to measure the major elements and trace elements in the coal. In combination with the microscope and the X-ray diffractometer（ XRD） as well as the related analysis and the sequential chemical extraction test（ SCEE）,the elements deposition conditions were analyzed. The study results showed that the major elements of Si,Al,Ca,Mg and Mn in the coal mined from the seam would be normal in the contents from a view of the average value of the coal in China and other rest major elements would be loss in the contents. The trace elements of As and Co contents in the coal would be obvious enrichment related to the world coal. The As in the coal would be mainly deposited in the aluminosilicate minerals and the organic sulfur and compounds. The Co would be mainly deposited in the aluminosilicate state and the sulfide. The hydrothermal effect of the Emai mantle plume and Emei basalt magma in the region would cause an abnormal enrichment of As and Co elements in the coal.