次火山热变质煤的物理测试特征

CHARACTERISTICS OF FTIR,ESR,XRD OF THE COAL METAMORPHIZED BY SUB-VOCANICS

样品采自伊敏褐煤盆地中一个因次火山活动形成的烟煤区,包含了从褐煤到瘦煤的变质系列。红外光谱分析表明,煤的含氧基团在褐煤阶段已开始消失,烷基和芳环同步增加,在 R°=1.10％时达最大值。顺磁共振自由基浓度和 X—衍射参数 La/Lc 介于区域变质煤和岩浆接触热变质煤之间,芳核外官能团的热演化超前于芳核骨架及 R°的演化。

The samples collected from a bituminous coal area formed by subvocanics in Yimin Brown CoalField compose a series from brown coal to lean coal.Analysis of FTIR shows that oxygen-bearing functionalgroup began to disapear in brown coal,alkyl and aromatic rings increase synchronously with increase of R°,reaching maxmium when R°is 1.10.Analysis of ESR and XRD shows that concentration of free radical and theratio La/Lc of aromatic skeleton of the coal are between those of area-metamorphized coal and vocanics-contactmetamorphized coal.Evolution of functional group is prior than that of aromatic skeleton and R°。