富钒煤中钒的精细化学结构与地质成因

Vanadium-rich coal has potential economic value, and its development and utilization have significant environmental impact. This study is of great significance for the resource utilization of vanadium in coal, the control and prediction of vanadium release during the utilization of vanadium-rich coal, the development of clean coal utilization technology, and the formulation of corresponding environmental regulations. This study intends to use Yunnan Xinde, Yunnan Yanshan and Guangxi Heshan vanadium-rich coal as research objects, using X-ray absorption fine structure spectroscopy and other methods to analyze the concentration, distribution, fine chemical structure and geological genesis of vanadium in vanadium-rich coal, to further reveal the enrichment model of vanadium-rich coal formation and explore the existence of vanadium in vanadium-rich coal under different coal-forming environments. By comparing with non-vanadium-rich coal, this study further explores the evolution characteristics of vanadium in vanadium-rich coal during geochemical processes, analyzes the effect of vanadium-rich mechanism of vanadium-rich coal on the fine chemical structure of vanadium in coal, and establishes the corresponding relationship between its fine chemical structure and geological genesis.

富钒煤具有潜在的经济价值，同时，其开发利用又存在显著的环境影响。本研究对于煤中钒的资源化利用、控制并预测富钒煤利用过程中的钒释放、发展洁净煤利用技术、以及制定相应的环保法规都具有重要意义。本研究拟以云南新德、云南砚山和广西合山富钒煤作为研究对象，采用X射线吸收精细结构光谱等方法和多手段相结合，分析钒在富钒煤中的含量分布、精细化学结构和地质成因，揭示富钒煤形成的富集模式，探寻不同成煤环境下富钒煤中钒的存在形式。通过与非富钒煤对比，进一步探讨富钒煤中的钒在地球化学过程中的演化特征，分析富钒煤的富钒机制对煤中钒的精细化学结构的影响，建立其精细化学结构与地质成因间的响应关系。

富金属煤中金属元素的精细化学结构及其对环境的影响尚不清晰。本研究对于煤中钒等金属元素的资源化利用及并控制释放具有重要意义。本研究采集了来自中国内蒙古、云南及安徽等多个省份的代表性煤样，使用多种技术分析煤中微量元素的精细化学结构，包括X射线光电子能谱(XPS)、近边X射线吸收精细结构(NEXAFS)，以及逐级化学萃取程序。通过聚类分析，基于微量元素的富集系数对煤样进行了分组，发现具有相似地质成因和临近地区的煤样更容易被分为一组，热液流体是富钒煤存在的重要因素。通过XPS分析在煤中观察到金属碳酸盐和金属硫酸盐。通过NEXAFS分析，煤中的主要碳形态被鉴定为酚碳、羧酸碳、不饱和碳和氧-烷基碳/羰基碳，飞灰的峰值幅度变化小于原煤的峰值，这表明碳的结构在高温燃烧后变得均匀。通过将XPS、NEXAFS和逐级化学提取法相结合，发现富钒煤中的钒主要以硅酸盐结合态和二硫化物结合态存在。.