基于XANES分析煤炭微波脱硫前后硫形态的变化

摘要

煤炭微波脱硫是当前洁净煤技术研究的热点，但目前对煤炭微波脱硫过程中硫形态的变化规律尚不完全清楚，本文采用同步辐射XANES方法分析微波脱硫前后煤中硫的赋存形态及其变化规律。结果显示，煤中硫主要以噻吩环、巯基(-SH)、亚硫酰基(S＝O)以及硫酸盐类矿物质的形式存在，经过微波脱硫后煤中含硫基团中噻吩类硫和巯基类硫含量降低，亚硫酰基类硫和硫酸盐类含量增加，煤中含硫基团向硫的氧化态转化。%Coal desulfurization by microwave radiation is becoming a hot issue in the field of clean coal technology in recent years,however,the changes rules of sulfur chemical forms in coal during desulfurization by microwave are still unclear.In this paper,the changes of sulfur chemi-cal forms in coal desulfurization have been analyzed by XANES.The results showed that the sul-phur exists in coal with forms of thiophene、sulfydryl(-SH)、sulfinyl(S=O)and sulfate.The con-tents of thiophene sulfur and sulfydryl sulfur decrease,and meanwhile the contents of sulfinyl sulfur and sulfate sulfur increase after desulfurization.The sulfur in coal tends to transform into its oxidation state.