Study of the ways for making comprehensive utilization of gangue and refuse produced by coal mines under Kailuan (Group) Limited Liability Corporation

The difference ways for making use of gangue and refuse place different requirements on their physiochemical properties and mineral compositions, and differ in environmental impacts. Analysis of the physiochemical properties of the classified gangue and refuse samples, such as the chemical and mineral compositions, contents of heavy metals, as well as proximate analysis are conducted. Analysis shows that the gangue and refuse of different sources exhibit different characteristics; and the waste produced by development separations and the handpicked waste can be directly used as backfill of subsided area or for underground stowing while the refuse coming from coal cleaning operations is suitable for use as building material, biological bacterial manure or for land reclamation. The study is made based on the requirements placed on the technologies for comprehensive utilization of such waste currently available and in line with the actual needs of coal mines. Through the study, the ways for making comprehensive utilization of the waste produced by different mines of Kailuan Corporation are determined, allowing the gangue and refuse to be utilized on a differentiated basis according to quality and grade.