高温弱还原气氛下煤中矿物质变化的研究

Mineral behavior in coal under reducing atmosphere at high temperature

利用XRD、SEM-EDX分析了神府煤中矿物质在高温下的变化,并针对不同停留时间对矿物质变化的影响作了考察。结果表明,高温下煤中矿物质在弱还原气氛中的变化基本与CaO-S iO2-A l2O3三元相图相符,矿物质的变化主要由钙质硅铝酸盐控制。停留时间的变化主要影响玻璃体和晶体相对含量的变化和含铁矿物质的类型。非晶态物质的含量与共熔体生成有密切关系,与共熔体体系的稳定性有关。FeS-FeO体系的性质及变化对矿物质体系有重要的影响,利用SEM-EDX对FeS和FeO的分布和变化进行了考察。

The behaviors of mineral matters in coal at high temperature were investigated under reducing atmosphere. X-ray diffraction and SEM-EDX were employed to observe phase changes and reactions of mineral matters. It is found that the phase composition and reactions of mineral matters are basically consistent with ternary phase diagram of CaO-SiO2-Al2O3. The system of mineral matters is mainly dominated by the change of Ca-aluminosilicates. The residence time influences both the crystalline and amorphous characteristics of mineral matters. The amounts of the amorphous phase appear to be dependent on the stability of the eutectic mixture. Under reducing atmosphere, FeO-FeS system has a significant influence on the mineral behaviors and morphologies.