煤中镧系元素有机-无机亲合性及其演变规律研究——以渭北晚古生代5~#煤层为例

The Organic or Inorganic Affinity of Lanthanide Elements in Coal and Its Evolution——A Case Study of the Late Paleozoic 5~﹟ Coal from Weibei

煤中不同的微量元素对有机质和无机质的亲合性各不相同.为了研究这种差异性,通过对渭北晚古生代5#煤层煤样酸处理脱灰实验结果定量性反推后发现,煤中LREE和HREE有着完全不同的有机亲合性演变规律.结果表明:LREE属于略偏于亲有机的Ⅲ型"两性元素",而HREE则属于有机亲合性很强的Ⅳ型和典型的亲有机质的Ⅴ型元素;LREE的有机亲合指数与其+3价离子半径呈正相关,其有机亲合性总体上随其离子半径增大而增大;而HREE的有机亲合指数与其+3价离子半径呈显著的负相关,其有机亲合性随其离子半径减小而增大.

There are different kinds of affinity to organic or inorganic matter for different kinds of trace elements in coal. In order to study this difference, the different evolution of organic af- finity between light rare earth elements （LREE） and heavy ones （HREE） in the late Paleozoic coal of the 5 formation from Weibei coalfield were studied by anti-reasoning after acid treatment. The results show that LREE belongs to 11 type dual nature element with more affinities to organic matter. HREE belongs to Ⅳ type with stronger affinity to organic matter and V type with typical organic affinity one. The organic affinity index of LREE is positive correlation with its＋3 valence, and the organic affinity increases with increasing of radii of ions. The organic affinity index of HREE is significant negative correlation with itsq-3 valence, and the organic affinity increases with decreasing of radii of ions.