摘要
采用^(57)Fe穆斯堡尔谱学方法,研究微波-磁分离法脱硫机理及微波辐照深度对脱硫率的影响。结果表明,微波选择性介质加热,可以激励煤中顺磁性黄铁矿FeS_2热解,使其转化为非化学计量的磁黄铁矿Fe_(1-x)S(0<x≤0.125)和陨硫铁FeS;前者所含4C超结构相Fe_0.875S(即Fe_7S_8)具有亚铁磁性,极大地提高了无机硫矿物质的磁化率,因而增加原煤磁分离脱硫效果;适当控制微波辐照时间,使Fe_(1-x)S生成量最多,可得到最佳脱硫效果。
Mossbauer spectroscopy was used to determine the transformations of pyrite inherent in coal before and after microwave heating/ magnetic separation. The influence of irradiation time of microwave on the removal of pyrte in coal was examined. The results for phase analyses show that the selective dielectric heating of microwave can convert the paramagnetic pyrite in coal to moderately ferro magnetic pyrrhotite Fe_(1-x)S (0<x≤0.125)which would enhance the composite magnetic susceptibility of pyrite inclusions, and further to antiferromagnetic troilite FeS. The optimum removal efficiency can be obtained by properly controlling the irradiation time to maximize the amount of pyrrhotite formed from pyrite decomposition during microwave exposure.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1992年第4期368-374,共7页
Journal of Fuel Chemistry and Technology
关键词
磁分离
脱硫
微波辐射
microwave irradiation
magnetic separation
desulfurization of coal
Mossbauer spectra
