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利用逐级化学提取实验和电感耦合等离子质谱(ICP-MS)相结合的方法,以吉林汪清罗子沟油页岩为研究对象,对油页岩原样及半焦中的稀土元素含量、地球化学特性、分布模式及其赋存状态进行研究。结果表明,与中国煤相比,汪清油页岩中稀土元素含量明显富集,且轻稀土元素富集程度高于重稀土元素,轻重稀土元素分馏明显。δCe_N为1.46,表现为明显正异常,表明其成岩环境不受海水影响,稀土元素与陆源岩关系密切且来源一致。汪清油页岩中稀土元素主要赋存在无机矿物质中,有机质中含量极少,硅铝化合物结合态占大部分,不同提取态对油页岩中稀土元素的分馏效应影响不同。经过干馏过程,油页岩半焦中稀土元素含量变化不大,稀土元素有明显富集趋势。稀土元素在干馏过程中的迁移主要是由于稳定态、硫化物结合态减少,碳酸盐结合态增多,其中铁锰氧化物结合态变化不明显。
Using the combination of step-by-step chemical extraction experiment and inductively coupled plasma mass spectrometry (ICP-MS), taking Luozhangou oil shale in Wangqing as an example, the contents of rare earth elements, geochemistry Characteristics, distribution patterns and their occurrence state. The results show that compared with the Chinese coal, the content of rare earth elements in Wangqing oil shale is obviously enriched, and the enrichment of light rare earth elements is higher than that of heavy rare earth elements, and the fraction of light and heavy rare earth elements is obviously fractionated. δCe_N is 1.46, showing a significant positive anomaly, indicating that the diagenetic environment is not affected by seawater. The REE is closely related to the terrigenous rocks and has the same source. The rare earth elements in Wangqing oil shale are mainly found in inorganic minerals, with very little organic matter and the majority of silicon and aluminum compounds. Different extraction conditions have different effects on the fractionation of rare earth elements in oil shale. After the retorting process, the content of rare earth elements in the oil shale semi-coke little change, rare earth elements are obviously enriched. The migration of rare earth elements in the process of dry distillation is mainly attributed to the steady state, the decrease of the bound states of sulfides and the increase of the carbonate bound states, and the change of the bound states of the ferromanganese oxides is not obvious.