The floatation-sink test and XRD analysis showed that the mineral content of Chongliangshan coal was increased as the density increased, especially kaolinite and pyrite with high dielectric constant.

• 浮沉试验和X射线衍射分析显示，中梁山煤中矿物质的含量随着密度的增大而增加，特别是介电常数较高的高岭石和黄铁矿。