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煤微波氧化脱硫中含硫组分及介电特性变化
发表时间：2016-12-31 浏览量：2129 下载量：648
| 全部作者： | 张明旭，刘松，徐敬尧，贾送宽 |
| 作者单位： | 安徽理工大学材料科学与工程学院 |
| 摘 要： | 选用新阳高硫煤样，在微波频率2.45 GHz条件下，以HAc-H2O2溶液为助剂开展微波脱硫试验，采用X射线衍射（X-ray diffraction，XRD）和X射线光电子能谱（X-ray photoelectron spectroscopy，XPS）对试验前后煤中含硫组分进行分析表征，基于传输反射法对煤样的复介电常数进行测定。结果表明，新阳高硫煤样的全硫脱除率为47.64%，试验后煤中无机硫含量极少。XRD分析显示煤中黄铁矿、方解石在试验后消失，XPS解叠出新阳高硫煤样中有机硫组分主要为噻吩硫、亚砜硫和硫醇硫醚硫3类，其中噻吩硫约占有机硫组分的63.53%，硫醇硫醚硫含量最少，有机硫脱除率为29.63%，煤中含硫组分由易到难的脱除次序为：无机硫、硫醇硫醚硫、亚砜硫、噻吩硫；试验后煤样与微波的耦合能力降低，其复介电常数实部ε′和虚部ε″均低于原煤，尤其在12～15 GHz频率范围内虚部ε″降幅较为明显，试验后煤样吸收微波能力显著降低。 |
| 关 键 词： | 选矿工程；高硫炼焦煤；微波；含硫组分；介电特性 |
| Title： | Changes about sulfur components and dielectric properties of high-sulfur coal by microwave-assisted desulfurization |
| Author： | ZHANG Mingxu, LIU Song, XU Jingyao, JIA Songkuan |
| Organization： | School of Materials Science and Engineering, Anhui University of Science and Technology |
| Abstract： | The desulfurization experiment of Xinyang high-sulfur coal is conducted with HAc-H2O2 solution by 2.45 GHz microwave irradiation. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) are used to characterize the composition of coal samples, and the complex dielectric constant of Xinyang high-sulfur coal is measured by transmission and reflection method. Results indicate that the desulfurization rate of Xingyang high-sulfur coal is 47.64%, and very little inorganic sulfur is contented after experiment. The measurements of XRD show that pyrite and calcite in coal disappear after experiment; the analysis of XPS show that three main types of organic sulfur components in coal are thiophene, sulfoxide and mercaptan-thioether, and thiophene can reach to about 63.53% in organic sulfur, while mercaptan thioether is the least with the desulfurization rate is 29.63%. The order of desulfurization is inorganic-sulfur, mercaptan-thioether, sulfoxide and thiophene. The real part ε′ and imaginary part ε″ of the complex dielectric constant are reduced after experiment, especially in 12-15 GHz frequency range, the imaginary part ε″ has a significant decline, and it shows that the coupling capability between coal and microwave reduce after experiment. |
| Key words： | mineral processing engineering; high-sulfur coking coal; microwave; sulfur components; dielectric properties |
| 发表期数： | 2016年12月第24期 |
| 引用格式： | 张明旭，刘松，徐敬尧，等. 煤微波氧化脱硫中含硫组分及介电特性变化[J]. 中国科技论文在线精品论文，2016，9（24）：2552-2558. |
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