Physicochemical and Thermal Activation Properties of Waste Coal Gangue in Pingxiang Mining Area

Abstract

Abstract: In order to study the physicochemical properties of different types of coal gangue and the influence of calcination temperature on its activation degree, sample A, sample B and sample C from different mining areas of discarded coal gangue in Pingxiang were taken as the research objects. Based on the XRD test, physical property test, high temperature test and mechanical property test, the basic properties and thermal activation properties of coal gangue were analyzed from the aspects of physical and chemical characteristics, mechanical characteristics, and apparent characteristics. The results show that the physical and chemical properties of different types of gangue are different, and the gangue with higher active substance content has higher activity. Compared with sample A, sample B and sample C are more suitable for packing, and sample Chas higher porosity, water absorption and resistance to natural weathering and cracking. The optimal calcination temperature of different types of gangue varies slightly, all of them are about 800 ℃. The coal gangue which is not calcined or does not reach the optimal calcination temperature has low activity, and the prepared specimen has poor cementation and low strength. The coal gangue at the calcination optimum temperature has the highest activity, the best cementation, and the highest strength.

Key words: coal gangue, physical property, high temperature test, mechanical property, activation, resource utilization

CLC Number:

TU528

YAO Suqin, ZHA Wenhua, LIU Xinquan, JI Shengxing, HE Changchun, YU Yue. Physicochemical and Thermal Activation Properties of Waste Coal Gangue in Pingxiang Mining Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2280-2287.

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