摘要
用透射电镜及扫描电镜考察了煤中黄铁矿颗粒及其毗邻的有机硫含量。结果表明,与黄铁矿毗邻的有机硫分布均匀;在煤的热解过程中,黄铁矿(FeS_2)可能转化为磁黄铁矿(Fe_(1-x)S)或磁铁矿(Fe_3O_4),而部分无机硫则扩散到附近煤体中。测试在距黄铁矿颗粒边缘1—40/μm范围的媒体中进行。热解温度范围多数情况下为400—550℃。
Quantitative electron microscopy permits direct measurement ot organic sulfur in coal. Compared with the ASTM method, the electron microscopy technique has some advantages. It is direct and reliable, but the distinetive advantage is that it needs much less sample. It also allows determination of the spatial distribution of organic sulfur concentration on a scale of a few hundred angstroms. TEM has better resolution than SEM, though their accuracy and reliability in measurement of organic sulfur are comparable. Our applications include measurement of average organic sulfur content of coal. This paper shows a systematic study of the organic sulfur concentration and its distribution in the immediate vicinity of pyrite in the coal.Experimental results show that: (1) the organic sulfur content of macerals does not increase in the vicinity of pyrite in the original coal, at least with in the range of 1μm, (2) the pyrite (FeS_2) in coal may change into pyrrhotite(Fe_(1-x)S)or magnetite (Fe_3O_4) during heating and that some inorganic sulfur may migrate into the coal matrix near the mineral particles. The range of the measurement of organic sulfur is 1-40μm from pyrite. The range of the heating temperature is 400-550℃.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1992年第1期90-95,共6页
Journal of Fuel Chemistry and Technology
基金
美国能源部合同DE-AC02-76-ER1198资助~~
