准东煤灰化过程中的矿物演变及矿物添加剂对其灰熔融特性的影响

利用低温灰化、高温灰化和X射线衍射物相分析相结合的方法对准东煤中矿物质在加热过程中的演变规律进行了研究。结果表明，准东煤中原始矿物质以方解石、高岭石为主，随着燃烧温度的升高，煤灰中矿物质最终生成了铁橄榄石、硅酸钙等。此外，向准东煤中掺加不同比例的高岭土和刚玉混合添加剂，发现随着SiO₂/Al₂O₃比值的降低，煤中生成了钙矾石、钙铝榴石等高熔点物质，准东煤的灰熔点逐步升高。

Mineral conversion of Zhundong coal during ashing process and the effect of mineral additives on its ash fusion characteristics

Mineral conversion in heating process was studied by low temperature ashing, high temperature ashing and XRD. The results show that the original minerals in Zhundong coal mainly include calcite and kaolinite. With the increase of combustion temperature, they transform into fusible minerals such as fayalite and calcium. In addition, refractory minerals, ettringite and grossular, generated in ash samples, result in higher ash melting points with the decrease in SiO₂/Al₂O₃ ratio which was adjusted by adding kaolinite and alumina into the raw coal.